JP2008208744A - Spacer for water jacket of cylinder block of internal combustion engine, mounting method of spacer for water jacket to cylinder block, and internal combustion engine provided with the spacer for water jacket - Google Patents

Abstract

[PROBLEMS] To provide a water jacket spacer capable of suitably suppressing cooling of a cylinder when mounted on the cylinder block while improving workability when mounted on the cylinder block, and mounting of the spacer on the cylinder block. A method and an internal combustion engine provided with the water jacket spacer are provided.
In the spacer 20, when the divided bodies 21 and 22 are arranged close to each other, the size of the region formed by the inner periphery thereof becomes smaller than the size of the cylinder outer peripheral surface 10a. The spacer 20 is held by the holder 23 in a state in which the divided bodies 21 and 22 are separated from each other so that the size of the region formed by the inner circumference of the divided bodies 21 and 22 is larger than the size of the cylinder outer peripheral surface 10a. The Further, the holder 23 moves with the application of external force, and the divided bodies 21 and 22 are brought close to each other so that the size of the region formed by the inner circumference of the divided bodies 21 and 22 is equal to the cylinder outer peripheral surface 10a. It is done.
[Selection] Figure 6

Description

  The present invention relates to a water jacket spacer disposed in a water jacket formed in a cylinder block of an internal combustion engine, a method of mounting the spacer on a cylinder block, and an internal combustion engine provided with the water jacket spacer. About.

  As is well known, a water jacket is formed in the cylinder block of the internal combustion engine so as to surround the outer periphery of the cylinder, and cooling water is circulated in the water jacket so that the cylinders are cooled. Yes. Further, in the cylinder block, a temperature gradient is usually generated in the vicinity of the combustion chamber located in the upper part of the cylinder and relatively low in the lower part far from the combustion chamber. Therefore, conventionally, it has been studied to correct the temperature gradient of each part of the cylinder by appropriately changing the properties of the water jacket. For example, in a cylinder block in which a spacer for narrowing the flow path width of the water jacket is disposed on the lower side of the water jacket, the flow rate of the cooling water is limited on the lower side of the water jacket. . That is, since cooling of the lower part of the cylinder, which is lower in temperature than the upper part of the cylinder, is suppressed, the temperature gradient of each part of the cylinder can be corrected.

  However, in a cylinder block in which such a spacer is disposed, when a gap is formed between the spacer and the cylinder, cooling water flows into the gap, and as a result, the cooling suppression effect by the spacer is reduced. It becomes like this.

Therefore, the water jacket spacer for the cylinder block described in Patent Document 1 employs an inner peripheral shape corresponding to the outer peripheral shape of the cylinder row and a two-divided structure. And, both ends of each divided body are connected by a spring, and when the spring contracts, the size of the region formed by the inner circumference of the divided body is smaller than the outer circumference of the cylinder row. Adopted. With this structure as a spacer, if the spacer is once expanded so that the inner circumference dimension is larger than the outer circumference dimension of the cylinder row and then mounted on the cylinder block, the spacer splits are drawn together by the spring. When this is done, the inner peripheral surface of the spacer and the outer peripheral surface of the cylinder row come into close contact with each other. For this reason, since the flow of the cooling water into the gap is suppressed, the temperature gradient of each part of the cylinder can be suitably corrected.
JP 2005-120949 A

  By the way, according to the water jacket spacer of the cylinder block described in Patent Document 1, although the cooling of the cylinder is surely suppressed, the dimension of the inner circumference of the spacer is larger than the dimension of the outer circumference of the cylinder row. It is necessary to wear it while expanding it to become larger. As a means for expanding the spacer as described above, for example, there are means such as a method of expanding using a mounting jig and a method of manually expanding the spacer. In either case, there is a problem that workability during mounting deteriorates.

  The present invention has been made in view of such circumstances, and the object thereof is to improve the workability when being mounted on the cylinder block and to suitably suppress the cooling of the cylinder when being mounted on the cylinder block. It is an object of the present invention to provide a water jacket spacer, a method for mounting the spacer on a cylinder block, and an internal combustion engine in which the water jacket spacer is provided.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
The invention according to claim 1 is a water jacket spacer disposed in a water jacket formed in a cylinder block of an internal combustion engine, and an inner peripheral shape corresponding to an outer peripheral shape of a cylinder facing the water jacket. And a plurality of divided bodies in which the size of the region formed by the inner circumference is less than or equal to the outer circumference of the cylinder when arranged close to each other and the shape of the outer circumference of the cylinder The divided bodies are held apart from each other so that the dimension of the region formed by the inner circumference of the plurality of divided bodies arranged is larger than the outer circumference of the cylinder, and with the application of external force The divided body so that the dimension of the region formed by the inner circumference of the plurality of divided bodies is equal to or smaller than the outer circumferential dimension of the cylinder. It is summarized in that and a retainer for close was.

  According to this configuration, the holder is divided so that the size of the region formed by the inner circumference of the plurality of divided bodies arranged corresponding to the shape of the outer circumference of the cylinder is larger than the size of the outer circumference of the cylinder. Since the bodies are separated from each other, the spacer can be easily disposed in the water jacket. Further, after the spacer is disposed in the water jacket, if the external tool is applied and the holder is moved, the divided bodies are arranged so that the inner circumference of the plurality of divided bodies is equal to or smaller than the outer circumference of the cylinder. Therefore, when the spacer is mounted on the cylinder block, the cooling of the cylinder can be suitably suppressed.

  According to a second aspect of the present invention, in the water jacket spacer of the cylinder block according to the first aspect, the holder has an area formed by inner peripheries of the plurality of divided bodies, the dimension of the outer periphery of the cylinder. The gist is to have a mechanism for holding the divided bodies close to each other so as to be equal in size.

  According to the same configuration, the dimensions of the region are not continuously drawn so that the dimension of the area formed by the inner circumference of the plurality of divided bodies is equal to or less than the dimension of the outer circumference of the cylinder. Since the state where the divided bodies are brought close to each other so as to be equal to the size is maintained, it is possible to suppress unnecessary force from acting on the cylinder from the spacer. That is, deformation of the cylinder can be suppressed.

  According to a third aspect of the present invention, in the water jacket spacer of the cylinder block according to the second aspect, the mechanism for holding the divided bodies in a separated state and the divided bodies are held in proximity to each other. The gist is that the mechanism is realized by fitting a convex portion formed on one of the divided body and the holder to a concave portion formed on the other.

  According to this configuration, since the projections are fitted in the recesses, the divided bodies are held in a separated state or a close state, so that these states can be reliably held. . In addition, the said recessed part should just be what can fit the said convex part, for example, shall include what was formed so that the division body or the holder might be penetrated.

  According to a fourth aspect of the present invention, in the water jacket spacer of the cylinder block according to the third aspect, the concave portion extends along the axial direction of the cylinder and is paired across the adjacent portion of the divided bodies. The pair of recesses are formed so that the portions closer to the end on the side to which the external force is applied are closer to each other, and the projections are fitted to the pair of recesses, respectively. The split bodies are separated from each other by moving the split body and the holder relative to each other in the axial direction of the cylinder by the external force in a state where the pair of convex portions are fitted in the pair of concave portions. The gist of the present invention is to change the divided body to a state in which the divided bodies are brought close to each other.

  According to this configuration, the recesses are formed so as to form a pair extending along the axial direction of the cylinder and straddling the proximity part of the divided body, and the pair of recesses are portions close to the end on the side to which the external force is applied. The protrusions are formed so as to be close to each other, and the protrusions are formed as a pair so as to fit into the pair of recesses, respectively. For this reason, the split bodies can be easily brought close to each other by moving the split body and the holder relative to each other in the axial direction of the cylinder by an external force in a state where the pair of convex portions are fitted in the pair of concave portions.

  According to a fifth aspect of the present invention, in the spacer for a water jacket of the cylinder block according to the first aspect, the holder has an area formed by inner peripheries of the plurality of divided bodies, the dimension of the outer periphery of the cylinder. The gist is to have a mechanism for drawing the plurality of divided bodies together so as to be smaller than the dimensions.

  According to the same configuration, since the plurality of divided bodies are attracted so that the size of the region formed by the inner circumference of the plurality of divided bodies is equal to or less than the dimension of the outer circumference of the cylinder, the divided bodies are separated from each other. By simply releasing the holding, the plurality of divided bodies come close to each other, and the state in which these divided bodies are brought close to each other is held. That is, when the spacer is attached to the cylinder block, the divided bodies can be held in proximity to each other only by applying a relatively small external force to the holder.

  In this case, specifically, according to the invention described in claim 6, each of the adjacent divided bodies in the divided body is separated from the outer peripheral surface of the divided body when the spacer is attached to the cylinder block. A pair of first protrusions protruding outward in the radial direction of the cylinder, and when the spacer is mounted on the cylinder block, the first protrusion is positioned on the bottom side of the water jacket, and And a pair of second convex portions arranged so that the convex portions to be paired are separated from each other than the first convex portions, and the holder is configured so that the divided bodies are separated from each other. Two pairs of first concave portions that hold the first convex portion and the second convex portion, and two pairs that hold the first convex portion and the second convex portion so that the divided bodies are close to each other. A second concave portion, and the first convex portion and the second concave portion A convex part is inserted into the first concave part to keep the divided bodies separated from each other, and the first convex part and the second convex part are inserted into the second concave part. Thus, it is possible to adopt a configuration in which the divided bodies are held in a state of being brought close to each other.

  Invention of Claim 7 is the spacer for water jackets of the cylinder block as described in any one of Claims 1-5, When the said holder is assembled | attached to the said division bodies, the said holder is, The gist of the invention is that it has a portion projecting to the bottom side of the water jacket from the divided body.

  According to this configuration, the outer projecting part of the water jacket comes into contact with the bottom of the water jacket so that an external force is applied to the holder. Therefore, the spacer is naturally held when the spacer is mounted on the cylinder block. The tool will move. As a result, workability when the spacer is mounted on the cylinder block is improved.

  The invention according to claim 8 is a method for mounting a water jacket spacer disposed in a water jacket formed in a cylinder block of an internal combustion engine to the cylinder block, wherein the outer peripheral shape of the cylinder facing the water jacket is formed. A plurality of divided bodies having a shape of an inner circumference corresponding to the inner circumference and divided into regions adjacent to each other so that a size of a region formed by the inner circumference is equal to or less than a size of the outer circumference of the cylinder. The size of the region formed by the step of arranging according to the shape of the outer circumference and the inner circumference of the plurality of divided bodies arranged corresponding to the shape of the outer circumference of the cylinder is larger than the size of the outer circumference of the cylinder A step of assembling a holder between the adjacent divided bodies, and disposing the spacer in the water jacket. When the holder is moved by applying an external force to the holder, the size of the region formed by the inner circumference of the plurality of divided bodies is equal to or less than the dimension of the outer circumference of the cylinder. And the step of bringing them close together.

  According to the mounting method of the spacer on the cylinder block, the size of the region formed by the inner circumference of the plurality of divided bodies arranged corresponding to the outer circumference of the cylinder is larger than the dimension of the outer circumference of the cylinder. The spacers can be easily arranged in the water jacket by separating the divided bodies from each other by the holder. That is, the workability when the spacer is mounted on the cylinder block is improved. Further, according to the mounting method, by applying an external force to the holder, the inner circumferential dimension of the plurality of divided bodies becomes equal to or smaller than the outer circumferential dimension of the cylinder, so that the spacer comes into close contact with the cylinder.

  According to a ninth aspect of the present invention, in the method for mounting the water jacket spacer to the cylinder block according to the eighth aspect, the step of bringing the divided bodies closer to each other is performed when the spacer is disposed in the water jacket. The size of the region formed by the inner circumference of the plurality of divided bodies is equal to or less than the size of the outer circumference of the cylinder by moving the holder by bringing the holder into contact with the bottom of the water jacket. The gist is that it is a step of bringing the divided bodies close to each other.

  According to the mounting method of the spacer on the cylinder block, the holder can be moved by bringing the holder into contact with the bottom of the water jacket. To move on. That is, it is possible to simplify the workability when the spacer is mounted on the cylinder block.

  According to a tenth aspect of the present invention, in the method for attaching the water jacket spacer to the cylinder block according to the eighth aspect, the step of bringing the divided bodies close to each other is performed after the spacer is disposed in the water jacket. When the cylinder head of the internal combustion engine is assembled to the cylinder block, the size of the region formed by the inner circumference of the plurality of divided bodies is determined by moving the holder by bringing the holder into contact with the cylinder head. The gist is that it is a step of bringing the divided bodies close to each other so as to be equal to or smaller than the outer circumference of the cylinder.

  According to the mounting method of the spacer to the cylinder block, when the cylinder head of the internal combustion engine is assembled to the cylinder block, the holder can be moved by bringing the holder into contact with the cylinder head. When attaching the cylinder block to the cylinder block, the holder naturally moves. That is, even with such a configuration, it is possible to simplify the workability when the spacer is mounted on the cylinder block.

  According to an eleventh aspect of the present invention, in the method for mounting the water jacket spacer to the cylinder block according to the eighth aspect, the step of assembling the holder between the adjacent divided bodies corresponds to the shape of the outer periphery of the cylinder. A step of providing a separating means so that a dimension of an area formed by inner circumferences of the plurality of divided bodies arranged to be larger than a dimension of an outer circumference of the cylinder, and corresponding to a shape of the outer circumference of the cylinder And a step of providing a moving unit that draws the plurality of divided bodies closer together, and the step of bringing the divided bodies close to each other includes disposing the spacer by an external force after disposing the spacer in the water jacket. Thereafter, the size of the region formed by the inner circumference of the plurality of divided bodies by the shifting means becomes equal to or smaller than the outer circumference of the cylinder. It is summarized in that comprising a step of close to the divided bodies so.

  Further, according to the method of mounting the spacer on the cylinder block, the dimension of the region formed by the inner circumference of the plurality of divided bodies is equal to or less than the dimension of the outer circumference of the cylinder only by removing the separating means from the holder. The divided bodies come close to each other. That is, when the spacer is mounted on the cylinder block, the divided bodies can be brought close to each other only by applying a relatively small external force to the holder.

  According to a twelfth aspect of the present invention, in the internal combustion engine in which a water jacket spacer is disposed in a water jacket formed in a cylinder block of the internal combustion engine, the spacer has a shape of an outer periphery of a cylinder facing the water jacket. A plurality of divided bodies having a shape of an inner circumference corresponding to the inner circumference and divided and arranged so as to be close to each other so that the size of a region formed by the inner circumference is equal to or less than the outer circumference of the cylinder; and The divided bodies are held in a state of being separated from each other so that the size of the region formed by the inner circumference of the plurality of divided bodies arranged corresponding to the shape of the outer circumference is larger than the dimension of the outer circumference of the cylinder. In addition, the dimension of the area formed by the inner periphery of the plurality of divided bodies moving with the application of the external force is the dimension of the outer periphery of the cylinder It is summarized as being composed of a retainer for holding the state of being close to the divided bodies so as to lower.

  According to this configuration, in the internal combustion engine in which the water jacket spacer is disposed in the water jacket, the spacer can be easily disposed in the water jacket, and as a result, the assembly of the internal combustion engine is facilitated. . Further, the cooling of the cylinder can be suitably suppressed by the spacer disposed in the water jacket.

[First Embodiment]
1 is a diagram showing a first embodiment in which a water jacket spacer of a cylinder block of an internal combustion engine according to the present invention and a method of mounting the water jacket spacer to the cylinder block are embodied in a cylinder block of a V-6 engine. A description will be given with reference to FIGS. In this embodiment, the cylinder block of the internal combustion engine is an open deck cylinder block for a V type 6 cylinder engine in which three cylinders are divided and arranged in two banks, and the upper deck portion side of the water jacket is opened. Is assumed.

First, the entire structure of a cylinder block to which the water jacket spacer of the present invention is applied will be described with reference to FIGS.
As shown in FIG. 1A, the planar structure of the bank on one side of the cylinder block, and in FIG. 1B, the partial cross-sectional structure along the line AA in FIG. 10 is partially connected, and a cylinder liner 11 having excellent wear resistance is provided inside each cylinder 10. Further, a water jacket 12 is formed outside the cylinder 10 and serves as an engine cooling water channel for cooling the cylinder 10. The water jacket 12 connects the outer peripheral surface of the cylinder 10, that is, the outer peripheral surface of the cylinder 10a, the outer wall 13 of the cylinder block facing the outer peripheral surface of the cylinder 10a at a predetermined interval, and the cylinder 10 and the outer wall 13. It is formed as a region surrounded by a bottom wall 14 that forms the bottom of the water jacket 12.

  Further, in this cylinder block, an upper deck portion 10 b is formed by the top surface of the cylinder 10 and the top surface of the outer wall 13. As described above, the cylinder block is an open deck type in which the water jacket 12 is opened to the upper deck portion 10b side.

  Further, in this cylinder block, the bottom side of the water jacket 12 has an inner peripheral surface shape corresponding to the shape of the cylinder outer peripheral surface 10a, and a spacer for narrowing the flow passage width of the water jacket 12 20 is arranged. As shown in FIG. 2, the spacer 20 has a structure in which the spacer 20 is divided into a first divided body 21 and a second divided body 22 along the arrangement direction of the cylinders 10. ing. And the convex parts 23a and 23b of the holder 23 are formed in the first concave parts 21a and 22a and the second concave parts 21b and 22b formed in the divided parts 21 and 22 in the adjacent part 24 where the divided bodies 21 and 22 are adjacent. The third protrusions 23c of the holder 23 are pressed against the peripheral edges of the third recesses 21c and 22c formed in the divided bodies 21 and 22, respectively. By attaching the holder 23 to the divided bodies 21 and 22 in this way, the divided bodies 21 and 22 are connected to each other, and the divided bodies 21 and 22 are reliably held in a state of being close to each other. The spacer 20 has a dimension of an area formed by the inner periphery of the divided bodies 21 and 22 when the divided bodies 21 and 22 are arranged close to each other by the holder 23, and the dimension of the cylinder outer peripheral surface 10a. Therefore, the spacer 20 comes into close contact with the cylinder outer peripheral surface 10a.

  Incidentally, the spacer 20 shown in FIG. 2 is formed by the inner periphery of the divided bodies 21 and 22 before and after being disposed in the water jacket 12, more specifically before and after applying an external force to the holder 23. The dimensions of the area to be changed will change. Hereinafter, the structure of the divided bodies 21 and 22 of the spacer 20 and the structure of the holder 23 will be described with reference to FIGS. 3 and 4, and then an external force is applied to the holder 23 with reference to FIGS. 5 to 7. The shape of the spacer 20 before and the shape of the spacer 20 after applying external force are demonstrated.

  As shown in the perspective structure of the first divided body 21 and the second divided body 22 in FIG. 3A, the axial direction of the cylinder 10 is provided at both ends of the divided bodies 21 and 22 in the arrangement direction of the cylinders 10. That is, the first recesses 21a and 22a are formed so as to be paired so as to extend in the vertical direction in the drawing and straddle the adjacent portions of the divided bodies 21 and 22. These first recesses 21a and 22a are formed in such a manner that they are closer to each other on the upper side in the drawing, and a cross-sectional structure taken along line BB in FIG. 3A is shown in FIG. Further, the inner peripheral portion is formed in an L-shaped cross section extending in the direction in which the divided bodies 21 and 22 are close to each other. In addition, the portion on the upper side in the figure where these first recesses 21a and 22a are closest to each other has a cross-sectional rectangular structure along the line CC in FIG. 3A, as shown in FIG. First enlarged diameter portions 21e and 22e formed in a shape are formed. Further, both ends of the divided bodies 21 and 22 in the arrangement direction of the cylinders 10 have substantially the same form as the first recesses 21a and 22a below the first recesses 21a and 22a in the drawing. Second recesses 21b and 22b are formed. The second recesses 21b and 22b have second expanded portions 21f and 22f that extend in the direction opposite to the first expanded portions 21e and 22e of the first recesses 21a and 22a. Is formed. Further, at both ends in the arrangement direction of the cylinders 10 of the divided bodies 21 and 22, a rectangular shape is formed so as to form a pair so as to straddle the adjacent portions of the divided bodies 21 and 22 in the vicinity of the second recesses 21b and 22b. The third recesses 21c, 22c and the fourth recesses 21d, 22d are each formed in a form aligned in the vertical direction in the figure. In addition, the said recessed parts 21a-21d and 22a-22d are actually formed as a hole which penetrates the division bodies 21 and 22, respectively.

  Subsequently, as shown in FIG. 4 in the perspective structure of the holder 23, a first through hole 23d is formed at the center of the holder 23 so as to form a pair across the center line m1 of the holder 23. And the 1st convex part 23a is formed in the aspect extended in the inside of this 1st through-hole 23d toward the said centerline m1. Incidentally, the first convex portion 23a has a cross-sectional structure along the line DD in FIG. 4A extending toward the inner peripheral side of the holder 23 as shown in FIG. 4B. The cross section is formed in an L shape. Further, the holding tool 23 is formed with a second through hole 23e in a pair extending across the center line m1 of the holding tool 23 below the first through hole 23d in the figure. The second protrusion 23b is formed in the through hole 23e so as to extend in the direction opposite to the center line m1. Incidentally, the second convex portion 23b is formed in an L-shaped cross section extending toward the outer peripheral side of the spacer 20 in the same manner as the first convex portion 23a. Furthermore, the holder 23 is formed with a third through hole 23f extending in the direction along the center line m1 in the vicinity of the second through hole 23e. And the protrusion part 23g is formed in the inside of this 3rd through-hole 23f in the aspect extended | stretched upwards in the figure from the downward direction in the figure. At the tip of the projecting portion 23g, as shown in FIG. 4 (c), a third protrusion projecting in the inner circumferential direction of the holder 23 is taken along the line EE of FIG. 4 (a). A portion 23c is formed. And the spacer 20 comprised from this holder 23 and the said division bodies 21 and 22 will be assembled through the process shown by Fig.5 (a), (b).

  That is, as shown in FIG. 5A, first, the first divided body 21 and the second divided body 22 are arranged in correspondence with the shape of the cylinder outer peripheral surface 10a illustrated by the two-dot chain line. And while inserting the 1st convex part 23a of the said holder 23 in the 1st enlarged diameter parts 21e and 22e of the division bodies 21 and 22, respectively, the 2nd convex part 23b of the said holder 23 is each division body. 21 and 22 are inserted into the second enlarged diameter portions 21f and 22f, respectively. Thereafter, when the holder 23 is moved downward in the figure with respect to the divided bodies 21 and 22, the third convex portion 23 c of the holder 23 is moved to the periphery of the fourth concave portions 21 d and 22 d of the respective divided bodies 21 and 22. The holding tool 23 is fixed to each of the divided bodies 21 and 22 by being pressed. When the holder 23 is fixed to the divided bodies 21 and 22 in this way, the structure shown in FIG. 5B, that is, the size of the region formed by the inner circumference of the divided bodies 21 and 22 is the cylinder outer peripheral surface 10a. The spacer 20 having a structure in which the divided bodies 21 and 22 are separated from each other so as to be larger than the dimension is assembled. At this time, the upper portion of the holder 23 protrudes from the upper ends of the divided bodies 21 and 22. Thus, the third protrusion 23c is fitted in such a manner that the third protrusion 23c is pressed against the periphery of the fourth recesses 21d and 22d, so that the spacer 20 is reliably in a state where the divided bodies 21 and 22 are separated from each other. It will be retained. That is, a mechanism that holds the state in which the divided bodies 21 and 22 are separated from each other is configured by the third convex portion 23c and the fourth concave portions 21d and 22d. Here, as described above, in the spacer 20, the size of the region formed by the inner periphery of the divided bodies 21 and 22 changes before and after applying an external force to the holder 23. Hereinafter, in the assembled spacer 20, changes in the dimensions of the region formed by the inner periphery of the spacer 20 when an external force is applied to the holder 23 will be described with reference to FIGS. 6 and 7.

  6A shows a perspective structure of the spacer 20 before the external force is applied to the holder 23, and FIG. 6B shows a front structure of the spacer 20. In this spacer 20, the divided bodies 21 and 22 are provided. The two are held in such a manner that they are separated from each other by the gap ΔS1. At this time, as described above, the dimension of the region formed by the inner periphery of the divided bodies 21 and 22 is larger than the dimension of the cylinder outer peripheral surface 10a. When the external force F directed downward in the figure along the axial direction of the cylinder 10 is applied to the holder 23 while restricting the movement of the divided bodies 21 and 22 from this state, the holder 23 is separated from the divided bodies 21 and 22. The third protrusion 23c of the holder 23 is disengaged from the fourth recesses 21d and 22d of the divided bodies 21 and 22, and then the first protrusion 23a of the holder 23 is moved to the divided body 21. , 22 move downward in the figure along the periphery of the first recesses 21a, 22a. At this time, the second convex portion 23b of the holder 23 also moves downward in the drawing along the periphery of the second concave portions 21b and 22b of the divided bodies 21 and 22. Thus, when the holder 23 moves relative to the divided bodies 21 and 22 downward in the drawing, that is, in the axial direction of the cylinder 10, the first concave portions 21a and 22a and the second concave portions 21b and 22b are shown in the drawing. Since the lower side is formed so as to be separated from each other, the divided bodies 21 and 22 are relatively moved in a direction in which they are close to each other. After that, when the third convex portion 23c of the holder 23 is fitted in such a manner that the third convex portion 23c is pressed against the periphery of the third concave portions 21c and 22c of the divided bodies 21 and 22, the holder 23 is brought into contact with the divided bodies 21 and 22. Fixed. At this time, as shown in FIG. 7A, the perspective structure of the spacer 20 after the external force F is applied to the holder 23, and the front structure of the spacer 20 in FIG. However, the two ends are held in a manner separated by a gap ΔS2 smaller than the gap ΔS1. At this time, the divided bodies 21 and 22 are held in such a manner that the dimension of the region formed by the inner circumference of the divided bodies 21 and 22 is equal to the dimension of the cylinder outer circumferential surface 10a. In other words, the third convex portion 23c and the third concave portions 21c and 22c constitute a mechanism that holds the divided bodies 21 and 22 in proximity to each other. In this way, the divided bodies 21 and 22 and the holder 23 are connected in a state where the first convex portion 23a and the second convex portion 23b are fitted in the first concave portions 21a and 22a and the second concave portions 21b and 22b, respectively. By relatively moving the cylinder 10 in the axial direction by the external force F, the divided bodies 21 and 22 can be easily brought close to each other. Moreover, the state which made the division bodies 21 and 22 adjoin can be reliably hold | maintained by fitting in the aspect by which the 3rd convex part 23c is pressed on the periphery of the 3rd recessed parts 21c and 22c. It becomes like this. And the spacer 20 which has such a structure will be mounted | worn with a cylinder block through the process shown to Fig.8 (a)-(c) and Fig.9 (a)-(c).

  In this step, first, FIG. 8A shows a planar structure of the cylinder block, FIG. 8B shows a cross-sectional structure taken along line FF of FIG. 8A, and FIG. As shown in each of the perspective structures, the spacer 20 is disposed in the water jacket 12 while maintaining the state shown in FIGS. 6 (a) and 6 (b). That is, the state where the divided bodies 21 and 22 are separated from each other is held by the holder 23 so that the dimension of the region formed by the inner circumference of the divided bodies 21 and 22 is larger than the dimension of the cylinder outer peripheral surface 10a. Since the spacer 20 is disposed in the water jacket 12 as it is, the spacer 20 can be easily disposed in the jacket 12. The spacers 20 are disposed in both banks of the cylinder block formed in the V shape. And after arrange | positioning the spacer 20 in the water jacket 12 in this way, as shown in FIG.9 (c), as shown in FIG.9 (c), the part which protruded above the upper ends of the said division bodies 21 and 22 in the holder 23 is set to the said cylinder. When the axial external force F of 10 is applied, the spacer 20 is attached to the cylinder block as shown in FIGS.

  That is, FIG. 9A shows the planar structure of the cylinder block, FIG. 9B shows the sectional structure along the line GG of FIG. 9A, and FIG. 9C shows the perspective structure of the cylinder block. As shown, when the external force F in the axial direction of the cylinder 10 is applied to the holder 23, the form of the spacer 20 changes to the form shown in FIGS. 7 (a) and 7 (b). That is, since the divided bodies 21 and 22 are brought close to each other so that the size of the region formed by the inner circumference of the divided bodies 21 and 22 is equal to the dimension of the cylinder outer peripheral surface 10a, the spacer 20 is attached to the cylinder block. When it does, cooling of the lower part of the cylinder 10 can be suppressed now suitably. Further, since the state in which the divided bodies 21 and 22 are brought close to each other is maintained so that the size of the region formed by the inner circumference of the divided bodies 21 and 22 is equal to the size of the cylinder outer peripheral surface 10a, the spacer 20 Therefore, it is possible to suppress unnecessary force from acting on the cylinder 10. That is, the deformation of the cylinder 10 can be suppressed.

  As described above, the water jacket spacer of the cylinder block of the internal combustion engine according to the present embodiment, the mounting method of the water jacket spacer to the cylinder block, and the internal combustion engine provided with the water jacket spacer are provided. According to this, the following effects can be obtained.

  (1) The size of the region formed by the inner circumference of the divided bodies 21 and 22 arranged corresponding to the shape of the outer circumference of the cylinder 10 is made larger by the holder 23 than the dimension of the cylinder outer circumferential surface 10a. The divided bodies 21 and 22 are separated from each other. For this reason, the spacer 20 can be easily disposed in the water jacket 12, and as a result, workability when the spacer 20 is mounted on the cylinder block is improved. Further, after the spacer 20 is disposed in the water jacket 12, the dimension formed by the inner periphery of the divided bodies 21 and 22 by applying the external force F and moving the holder 23 is the dimension of the cylinder outer peripheral surface 10a. The divided bodies 21 and 22 are brought close to each other so as to be equal to each other. For this reason, when the spacer 20 is attached to the cylinder block, the cooling of the cylinder 10 is suitably suppressed.

  (2) The holder 23 keeps the divided bodies 21 and 22 close to each other so that the dimension of the region formed by the inner circumference of the divided bodies 21 and 22 is equal to the dimension of the cylinder outer peripheral surface 10a. It was made to be. For this reason, it is possible to suppress an unnecessary force from acting on the cylinder 10 from the spacer 20, and as a result, deformation of the cylinder 10 can be suppressed.

  (3) The mechanism that maintains the state where the divided bodies 21 and 22 are separated from each other is fitted in such a manner that the third convex portion 23c of the projecting portion 23g is pressed against the periphery of the fourth concave portions 21d and 22d. I realized it. Further, the mechanism for maintaining the state in which the divided bodies 21 and 22 are brought close to each other is fitted in such a manner that the third convex portion 23c of the projecting portion 23g is pressed against the periphery of the third concave portions 21c and 22c. It was made to realize. For this reason, these states can be held reliably.

  (4) The first concave portions 21a and 22a and the second concave portions 21b and 22b of the divided bodies 21 and 22 are extended along the axial direction of the cylinder 10 and are paired across the adjacent portions of the divided bodies 21 and 22. It formed so that it might become. In addition, the first recesses 21a and 22a and the second recesses 21b and 22b are closer to each other at the upper side in FIG. 6A, that is, closer to the end on the side to which the external force F is applied. Formed. Further, the first and second convex portions 23a and 23b of the holder 23 are formed in pairs so as to be fitted into the first concave portions 21a and 22a and the second concave portions 21b and 22b, respectively. I made it. Therefore, the divided bodies 21 and 22 and the holder 23 are connected in a state in which the first convex portion 23a and the second convex portion 23b are fitted in the first concave portions 21a and 22a and the second concave portions 21b and 22b, respectively. By relatively moving the cylinder 10 in the axial direction by the external force F, the divided bodies 21 and 22 can be easily brought close to each other.

  (5) As a method of attaching the spacer 20 to the cylinder block, the size of the region formed by the inner circumference of the divided bodies 21 and 22 arranged corresponding to the cylinder outer circumferential surface 10a is larger than the outer circumference of the cylinder. Thus, the divided bodies 21 and 22 are separated from each other by the holder 23. For this reason, the spacer 20 can be easily disposed in the water jacket 12, and as a result, workability when the spacer 20 is mounted on the cylinder block is improved.

  (6) By using such a spacer 20, in the internal combustion engine in which the spacer 20 is disposed in the water jacket 12, the spacer 20 can be easily disposed in the water jacket 12. Assembling of the internal combustion engine is facilitated. Further, the cooling of the cylinder 10 can be suitably suppressed by the spacer 20 disposed in the water jacket 12.

  The spacer for the water jacket of the cylinder block of the internal combustion engine according to the first embodiment can be implemented by appropriately changing this, for example, as in the following modification.

(First modification)
10 to 13 show a first modification of the water jacket spacer according to the first embodiment.

  In this modified example, as shown in the perspective structure of the divided bodies 121 and 122 in FIG. 10, the both ends of the divided bodies 121 and 122 in the cylinder arrangement direction are extended in the vertical direction (cylinder axial direction) in the figure. At the same time, recesses 121a and 122a are formed so as to form a pair across the proximity of the divided bodies 121 and 122, respectively. These recesses 121a and 122a are formed in such a manner that they are closer to each other on the upper side in the figure. Openings 121b and 122b are formed on the upper surfaces of the divided bodies 121 and 122, respectively. The recesses 121a and 122a are formed with first accommodating portions 121c and 122c that are extended so as to be close to each other in the lower part of the drawing. The recesses 121a and 122a are formed with second storage portions 121d and 122d extending upward in the drawing at the intermediate portions thereof. The second accommodating portions 121d and 122d are formed in a portion closer to the proximity of the divided bodies 121 and 122 than the first accommodating portions 121c and 122c. More specifically, the end surfaces on the same proximity portion side of the second storage portions 121d and 122d are formed closer to the proximity portion than the end surfaces 121e and 122e on the same proximity portion side of the first storage portions 121c and 122c. ing.

  11A shows the front structure of the holder 123, and FIG. 11B shows the cross-sectional structure taken along the line H-H of FIG. 11A. While having the shape which protruded in the back surface (surface facing the division bodies 121 and 122) of the tool 123, a pair of convex part 123a inserted in the recessed parts 121a and 122a of the said division bodies 121 and 122 is formed. And this holder 123 will be attached to the said division bodies 121 and 122 as shown to Fig.12 (a)-(c).

  That is, after the convex portion 123a of the holder 123 is inserted from the openings 121b and 122b of the concave portions 121a and 122a of the divided bodies 121 and 122, the second accommodating portions 121d and 122d are formed along the concave portions 121a and 122a. 122d. Then, as shown in FIG. 12C, a cross-sectional structure taken along the line II in FIG. 12B is used to narrow the divided bodies 121 122 between the main body of the holder 123 and the convex portion 123a. The holding tool 123 is fixed to the divided bodies 121 and 122 in a manner of holding. Therefore, the spacer 120 is held in a state in which the divided bodies 121 and 122 are separated from each other so that the dimension of the region formed by the inner circumference of the divided bodies 121 and 122 is larger than the dimension of the cylinder outer peripheral surface 10a. Will be. Therefore, according to such a spacer 120, the spacer 120 can be easily disposed in the water jacket.

  From this state, an external force F is applied to the holder 123 to remove the convex portion 123a of the holder 123 from the second accommodating portions 121d and 122d of the divided bodies 121 and 122, and then to the concave portions 121a and 122a. And accommodated in the first accommodating portions 121c and 122c. Then, as shown in FIGS. 13A to 13C, the spacer 120 brings the divided bodies 121 and 122 close to each other. In this spacer 120, when the divided bodies 121 and 122 are brought close to each other, the dimension formed by the inner circumference of the divided bodies 121 and 122 is smaller than the dimension of the cylinder outer peripheral surface 10a. It has a simple structure. Since the spacer 120 has such a structure, when the spacer 120 is mounted on the cylinder block, the spacer 120 receives a reaction force from the cylinder 10, and the reaction force causes the protrusion 123 a to be the first. Are fixed in contact with the end surfaces 121e and 122e of the housing portions 121c and 122c. That is, since the spacer 120 is fixed to the divided bodies 121 and 122 and the spacer 120 is held in a state in which the divided bodies 121 and 122 are brought close to each other, when the spacer 120 is mounted on the cylinder block, Cooling of the cylinder 10 is suitably suppressed.

  As described above, even with such a configuration as the spacer, the effect according to the first embodiment can be obtained. Note that, as the spacer for the water jacket, a configuration in which the convex portion 123a of the holder 123 protrudes from a region formed by the inner circumference of the divided bodies 121 and 122, such as the spacer 120, may be adopted.

(Second modification)
14 to 18 show a second modification of the water jacket spacer according to the first embodiment.

  In this modified example, as shown in the perspective structure of the divided bodies 221 and 222 in FIG. 14, both ends of the divided bodies 221 and 222 in the cylinder arrangement direction protrude upward in the figure and the divided bodies 221 and 222 are A first convex portion 221a and a second convex portion 222a are formed so as to form a pair across the proximity portion. As shown in the enlarged front structure of the first convex portion 221a in FIG. 15 (a), the first convex portion 221a has a substantially rectangular shape. A projecting portion 221c is formed on the end surface 221b of the first convex portion 221a on the adjacent portion side, and an end surface 221d opposite to the end surface 221b is recessed toward the adjacent portion. Two grooves 221e and 221f are formed side by side along the axial direction of the cylinder 10. Further, as shown in FIG. 15B, the front structure of the second convex portion 222a is such that the second convex portion 222a has an end surface 222b on the opposite side to the end surface close to the proximity portion and an inclined surface. It has a trapezoidal shape. The end surface 222b has grooves 222e and 222f at positions corresponding to the grooves 221e and 221f of the first convex portion 221a. In addition, an insertion hole 222d that can be held in either the state in which the protruding portion 221c is inserted halfway or the state in which it is completely inserted is formed in the end surface 222c on the side of the proximity portion of the second convex portion 222a. ing.

  Further, as shown in FIG. 16, the cross-sectional perspective view of the holder 223 of the spacer 220 has a trapezoidal outer shape and is hollow in such a manner that the inside opens downward in the figure. Yes. And the protrusion part 223a, 223b is formed in the inside of the both side walls of the left-right direction in the figure of this holder 223 in the aspect which protrudes inside. And this holder 223 will be attached to the said division bodies 221 and 222 as follows.

  That is, as shown in FIGS. 17A and 17B, first, the protruding portion 221c of the first divided body 221 is inserted partway through the insertion hole 222d of the second divided body 222. Thereafter, the holder 223 is inserted from the upper side of the first protrusion 221a and the second protrusion 222a, and the protrusions 223a and 223b of the holder 223 are fitted into the grooves 221e and 222e. Then, the spacer 220 holds the divided bodies 221 and 222 apart from each other so that the size of the region formed by the inner circumference of the divided bodies 221 and 222 is larger than the size of the cylinder outer peripheral surface 10a. Will be. Therefore, according to such a spacer 220, the spacer 220 can be easily disposed in the water jacket.

  From this state, an external force F is applied to the holding tool 223 so that the protruding portions 223a and 223b of the holding tool 223 are removed downward from the grooves 221e and 222e, and then fitted into the grooves 221f and 222f. At this time, the protruding portion 221c is completely inserted into the insertion hole 222d. Then, as shown in FIGS. 18 (a) and 18 (b), the spacers 220 are separated from each other so that the inner peripheral dimensions of the divided bodies 221 and 222 are equal to the dimensions of the cylinder outer peripheral surface 10a. 222 will be held in close proximity. Therefore, according to such a spacer 220, the cooling of the cylinder 10 is suitably suppressed when the spacer 220 is mounted on the cylinder block.

As described above, even with such a configuration as the spacer, the effect according to the first embodiment can be obtained.
(Third Modification)
19 and 20 show a third modification of the water jacket spacer according to the first embodiment.

  In the first embodiment, the concave portions 21a and the like are formed in the divided bodies 21 and 22, and the convex portions 23a and the like are formed in the holder 23. However, in this modified example, the convex portions are provided in the divided body. Recesses were respectively formed on the surface.

  As shown in FIGS. 19A and 19B, the perspective structure of the spacer 320 before applying an external force to the holder 323 is shown in FIGS. 19A and 19B. In this modified example, the outer periphery of the divided members 321 and 322 of the spacer 320 A pair of convex portions 321a and 322a projecting from each other is provided. In addition, the holder 323 of the spacer 320 is formed with recesses 323a and 323b extending in the vertical direction in the figure and forming a pair across the center line m2 of the holder 323. Incidentally, these recesses 323a and 323b communicate with the sliding portions 323c and 323d extending in an arc shape from the bottom surface of the holder 323 to the central portion of the holder 323, and the end portions of the sliding portions 323c and 323d. First accommodating portions 323e and 323f that are extended along the axial direction of the cylinder 10 are formed. Further, second recesses 323g and 323h are formed in the recesses 323a and 323b so as to communicate with the intermediate portions of the sliding portions 323c and 323d and extend along the axial direction of the cylinder 10. In the spacer 320, the convex portions 321a and 322a of the divided bodies 321 and 322 are inserted into the concave portions 323a and 323b from the bottom surface of the holder 323, and then the second accommodating portion along the sliding portions 323c and 323d. It accommodates in 323g and 323h. Then, the spacer 320 is held in a state where the divided bodies 321 and 322 are separated from each other so that the size of the region formed by the inner circumference of the divided bodies 321 and 322 is larger than the dimension of the cylinder outer peripheral surface 10a. The Rukoto. Therefore, according to such a spacer 320, the spacer 320 can be easily disposed in the water jacket.

  From this state, an external force F is applied to the holder 323 to remove the convex portions 321a and 322a of the divided bodies 321 and 322 from the second accommodating portions 323g and 323h of the holder 323, and then the sliding portion 323c. , 323d are accommodated in the first accommodating portions 323e, 323f. Then, as shown in FIGS. 20 (a) and 20 (b), the spacer 320 has the above-mentioned dimension so that the size of the region formed by the inner circumference of the divided bodies 321 and 322 is equal to the dimension of the cylinder outer circumferential surface 10a. The divided bodies 321 and 322 are held in a close proximity. Therefore, according to such a spacer 320, the cooling of the cylinder 10 is suitably suppressed when the spacer 320 is mounted on the cylinder block.

As described above, even with such a configuration as the spacer, the effect according to the first embodiment can be obtained.
[Second Embodiment]
Next, a second embodiment in which a water jacket spacer of a cylinder block of an internal combustion engine according to the present invention is embodied will be described with reference to FIGS. In the second embodiment, the basic structure as the water jacket spacer is the structure shown in FIG. 2, and FIG. 21 corresponds to FIG. 6 and corresponds to FIG. FIG. 22 is shown as a diagram to be used. In FIGS. 21 and 22, the same elements as those shown in FIGS. 6 and 7 are denoted by the same reference numerals, and redundant descriptions are omitted. In the following, the differences between the two will be mainly described. explain.

  In the spacer 20 according to the first embodiment, since it is necessary to apply an external force to the holder 23 when the spacer 20 is attached to the cylinder block, the holder 23 is used when the spacer 20 is attached to the cylinder block. The process of applying external force to the is an essential process. In the present embodiment, when the spacer is mounted on the cylinder block, the spacer is moved naturally, in other words, the step of applying an external force to the holder is performed in combination with the other steps. The workability when mounting on the cylinder block is improved.

  FIG. 21A shows a perspective structure of the spacer 420 before applying an external force to the holder 23, and FIG. 21B shows a front structure of the spacer 420. The spacer 420 is the first embodiment. The spacer 20 is arranged upside down in the axial direction of the cylinder 10. That is, when the spacer 420 is disposed on the cylinder block, the holder 23 protrudes to the bottom side of the water jacket 12 from the region formed by the divided bodies 21 and 22. When moving to a predetermined position in the jacket 12, the protruding portion comes into contact with the bottom of the water jacket 12. Then, after the protruding portion abuts against the bottom of the water jacket 12, when the spacer 420 is further moved toward the bottom of the water jacket 12, an external force is applied from the cylinder block to the holder 23. . As a result, when the spacer 420 is mounted on the cylinder block, the holding tool 23 naturally moves due to this external force, so that workability when the spacer 420 is mounted on the cylinder block is improved. Then, when the spacer 420 is moved to a predetermined position in the water jacket 12, the perspective structure of the spacer 420 after applying external force to the holder 23 in FIG. 22 (a) is shown in FIG. 22 (b). As shown in the structure, the spacer 420 is held in a state in which the divided bodies 21 and 22 are brought close to each other.

  As described above, according to the water jacket spacer of the cylinder block of the internal combustion engine of the present embodiment, in addition to the effects (1) to (6) of the first embodiment, the following effects are further obtained. It will be obtained.

(7) When the holder 23 is assembled to the divided bodies 21 and 22, the holder 23 protrudes to the bottom side of the water jacket 12 from the divided bodies 21 and 22. As a result, the protruding portion abuts against the bottom of the water jacket 12 so that an external force is applied to the holder 23. Therefore, when the spacer 420 is attached to the cylinder block, the holder 23 naturally moves. It becomes like this. As a result, it is possible to improve and simplify workability when the spacer 420 is mounted on the cylinder block.
[Third Embodiment]
Next, a third embodiment in which a water jacket spacer of a cylinder block of an internal combustion engine according to the present invention is embodied will be described with reference to FIGS. In this third embodiment, the basic structure as a water jacket spacer is the structure shown in FIG. 2, and FIG. 23 corresponds to FIG. 6, and FIG. FIG. 24 is shown. Further, in FIGS. 23 and 24, the same elements as those shown in FIGS. 6 and 7 are denoted by the same reference numerals, and redundant description is omitted. The explanation is centered.

  As described above, in the spacer 20 according to the first embodiment, the step of applying an external force to the holder 23 when the spacer 20 is mounted on the cylinder block is necessary. However, a large external force is required at this time. If it becomes, there exists a possibility that the process may become complicated. Therefore, in this embodiment, the workability when the spacer is attached to the cylinder block is improved by reducing the external force to be applied to the holder when the spacer is attached to the cylinder block.

  23A shows a perspective structure of the spacer 520 before applying an external force to the holder 525, and FIG. 23B shows a front structure of the spacer 520. In this spacer 520, the first divided body is shown. A separation member 523 is held between the end surface of 521 and the end surface of the second divided body 522, and the divided bodies 521 and 522 are separated from each other by the separation member 523. In addition, the first divided body 521 and the second divided body 522 are each formed with a pair of protruding portions 521a and 522a protruding outward, and along the side surfaces of the protruding portions 521a and 522a. The clip-shaped elastic member 524 is mounted in such a manner that the And while the state where the divided bodies 521 and 522 are attracted to each other by the elastic member 524 is maintained, the divided bodies 521 and 522 are held apart by the spacing member 523. At this time, the size of the region formed by the inner periphery of the divided bodies 521 and 522 is larger than the size of the cylinder outer peripheral surface 10a. The spacing member 523 and the elastic member 524 constitute a holder 525. Then, when an external force is applied to the separation member 523 from this state and the separation member 523 is removed from the spacer 520, the perspective structure of the spacer 520 after the external force is applied to the holder 525 in FIG. As shown in (b), the front structure of the spacer 520, the divided members 521 and 522 are attracted to each other by the elastic member 524. Thereby, the dimension of the area | region formed by the inner periphery of the division bodies 521 and 522 becomes below the dimension of the cylinder outer peripheral surface 10a. Therefore, the split bodies 521 and 522 are brought close to each other only by applying a relatively small force for removing the spacing member 523 to the holder 525, and the spacer 520 brings the split bodies 521 and 522 close to each other. Will be held in.

  As described above, according to the water jacket spacer for the cylinder block of the internal combustion engine of the present embodiment, in addition to the effects (1), (5), (6) of the first embodiment, The following effects can be obtained.

  (8) The holding member 525 is provided with the elastic member 524 that draws the divided bodies so that the size of the region formed by the inner circumference of the divided bodies 521 and 522 is equal to or less than the size of the cylinder outer circumferential surface 10a. Accordingly, the divided bodies 521 and 522 are attracted so that the size of the region formed by the inner circumference of the divided bodies 521 and 522 is equal to or less than the size of the cylinder outer peripheral surface 10a. By simply releasing the holding, the divided bodies 521 and 522 come close to each other, and the divided bodies 521 and 522 are held close to each other. That is, when the spacer 520 is mounted on the cylinder block, the spacer 520 is held in a state in which the divided bodies 521 and 522 are brought close to each other only by applying a relatively small external force to the holder 525.

(First modification)
25 and 26 show a first modification of the water jacket spacer according to the third embodiment.

  The water jacket spacer according to this modification is based on the structure of the spacer according to the previous third embodiment, and when the spacer is attached to the cylinder block like the spacer according to the second embodiment. By moving the holder naturally, the workability when the spacer is mounted on the cylinder block is improved.

  As shown in FIGS. 25A and 25B, in the spacer 620 of this modified example, the end surface of the first divided body 621 and the end surface of the second divided body 622 are provided on the upper portion of the separation member 623. The enlarged diameter portion 623a is held. The diameter-enlarged portion 623a is formed so that the dimension in the end face direction of the first divided body 621 and the second divided body 622 is larger than the other part of the separating member 623. Incidentally, the separation member 623 constitutes a holder 624 together with the elastic member 524, and the spacer 620 is held by the separation member 623 in a state where the divided bodies 621 and 622 are separated from each other. The split bodies 621 and 622 have a pair of recesses 621a and 621a that form a space for accommodating the enlarged diameter portion 623a when the spacer 620 brings the split bodies 621 and 622 close to each other. 622a is formed. The space formed by the pair of recesses 621a and 622a has a similar shape slightly larger than the enlarged diameter portion 623a.

  On the other hand, the separation member 623 is provided with a pressure receiving portion 623b that protrudes downward in the drawing from the divided bodies 621 and 622. And according to such a holder 624, when this spacer 620 is arrange | positioned to a cylinder block similarly to the spacer 420 concerning the said 2nd Embodiment, the said pressure receiving part 623b becomes the said division body 621,622. Rather than the bottom of the water jacket 12. For this reason, when the spacer 620 is moved to a predetermined position in the water jacket 12, the protruding portion comes into contact with the bottom of the water jacket 12. Then, after this projecting portion comes into contact with the bottom of the water jacket 12, when the spacer 620 is further moved toward the bottom of the water jacket 12, an external force is applied from the cylinder block to the separating member 623. . For this reason, when the spacer 620 is mounted on the cylinder block, the separation member 623 naturally moves due to this external force, so that the workability when the spacer 620 is mounted on the cylinder block is improved. Then, when the spacer 620 is moved to a predetermined position in the water jacket 12, as shown in FIGS. 26 (a) and 26 (b), the enlarged diameter portion 623a of the spacing member 623 is formed by the recesses 621a and 622a. The spacer 620 is held by the elastic member 524 in a state where the divided bodies 621 and 622 are brought close to each other.

(Second modification)
27 and 28 show a second modification of the water jacket spacer according to the third embodiment.

  As shown in FIGS. 27 (a) and 27 (b), in this modification, a pair of first convex portions 721a and 722a and a spacer 720 are provided on the outer peripheral surface of the divided bodies 721 and 722 of the spacer 720. A pair of second convex portions 721b and 722b that are positioned closer to the bottom side of the water jacket 12 than the first convex portions 721a and 722a when mounted on the base plate are provided. By the way, the second convex portions 721b and 722b are arranged such that the pair of convex portions are separated from the first convex portions 721a and 722a.

  The holder 723 of the spacer 720 has a trapezoidal shape formed so as to expand downward in the figure, and has inclined portions 723a and 723b in which concave portions 723c to 723f are formed. In the spacer 720, the second convex portions 721b and 722b are fitted into the fourth concave portion 723f, and the first convex portions 721a and 722a are fitted into the third concave portion 723e. For this reason, the spacer 720 keeps the divided bodies 721 and 722 spaced apart so that the size of the region formed by the inner circumference of the divided bodies 721 and 722 is larger than the dimension of the cylinder outer peripheral surface 10a. Is done. Therefore, according to such a spacer 720, the spacer 720 can be easily disposed in the water jacket. Note that the holder 723 is formed of a relatively highly elastic metal or the like.

From this state, after applying an external force to the holder 723 and removing the first convex portions 721a and 722a and the second convex portions 721b and 722b from the third concave portion 723e and the fourth concave portion 723f, The first recess 723c and the second recess 723d are fitted. Then, as shown in FIGS. 28A and 28B, the spacers 720 are arranged in the divided bodies 721 and 722 so that the inner peripheral dimensions of the divided bodies 721 and 722 are equal to the dimensions of the cylinder outer peripheral surface 10a. It will be held in a state where they are close to each other. Therefore, according to such a spacer 720, the cooling of the cylinder 10 is suitably suppressed when the spacer 720 is mounted on the cylinder block.
[Other Embodiments]
In addition, each said embodiment and its modification can also be implemented with the following forms which changed these suitably.

  In the above-described embodiment, the clip-shaped elastic member 524 is used as a moving unit that draws the divided bodies 521, 522, 621, and 622 together, but a coil-shaped elastic member or the like may be used.

-In the said embodiment, although the spacer was divided | segmented into two division bodies, a spacer may be divided | segmented into 3 or more division bodies, and a holder may be provided in the adjacent part of these division bodies.
When the spacer is attached to a relatively upper part of the cylinder, the holding jig has a portion protruding above the upper deck of the cylinder block when the spacer is disposed in the water jacket. When the cylinder head of the internal combustion engine is assembled to the cylinder block, the holder is moved by bringing the holder into contact with the cylinder head, and the size of the region formed by the inner circumference of the plurality of divided bodies is You may make it make the division bodies adjoin so that it may become below the dimension of the outer periphery of.

  In the above embodiment, the water jacket spacer for the cylinder block of the internal combustion engine according to the present invention and the method for mounting the water jacket spacer to the cylinder block are applied to the cylinder block of the V-type 6-cylinder engine. For example, the present invention can be similarly applied to a V-type 8-cylinder engine, an in-line 4-cylinder engine, and the like.

(A) The top view which shows the planar structure of the bank of the one side about the cylinder block to which the spacer for water jackets concerning 1st Embodiment is applied. (B) The fragmentary sectional view along the AA line of the top view. The perspective view which shows the perspective structure of the spacer for water jackets of the embodiment. (A) The perspective view which shows the perspective structure of the division body about the spacer for water jackets of the 1st embodiment. (B) The fragmentary sectional view along the BB line of the perspective view. (C) The fragmentary sectional view along CC line of the perspective view. (A) The perspective view which shows the perspective structure of the holder about the spacer for water jackets of the 1st embodiment. (B) Sectional drawing along the DD line of the perspective view. (C) Sectional drawing along the EE line of the perspective view. (A), (b) The perspective view which shows the procedure about the assembly method of the spacer for water jackets of the 1st embodiment. (A) The perspective view which shows the perspective structure of the spacer before providing external force to the holder about the spacer for water jackets of the 1st embodiment. (B) The front view which shows the front structure of the spacer before providing external force to the holder about the spacer. (A) The perspective view which shows the perspective structure of the spacer after giving external force to the holder about the spacer for water jackets of the 1st embodiment. (B) The front view which shows the front structure of the spacer after giving external force to the holder about the spacer. (A) The top view which shows the partial planar structure of the bank of the one side about the cylinder block to which the spacer for water jackets of the 1st Embodiment is applied. (B) The fragmentary sectional view in alignment with the FF line of the same top view. (C) The perspective view which shows the partial perspective structure of the bank of the one side about the cylinder block. (A) The top view which shows the partial planar structure of the bank of the one side about the cylinder block to which the spacer for water jackets of the 1st Embodiment is applied. (B) The fragmentary sectional view in alignment with the GG line of the top view. (C) The perspective view which shows the partial perspective structure of the bank of the one side about the cylinder block. The perspective view which shows the perspective structure of the division body about the 1st modification of the spacer for water jackets of 1st Embodiment. (A) The front view which shows the front structure of the holder about the 1st modification of the spacer for water jackets of the 1st embodiment. (B) Sectional drawing along the HH line of the top view. (A) The perspective view which shows the perspective structure before providing external force to the holder about the 1st modification of the spacer for water jackets of the 1st embodiment. (B) The front view which shows the front structure before giving external force to the holder about the spacer. (C) Sectional drawing along the II line | wire of the same front view. (A) The perspective view which shows the perspective structure after giving external force to the holder about the 1st modification of the spacer for water jackets of the 1st embodiment. (B) The front view which shows the front structure after giving external force to the holder about the spacer. (C) Sectional drawing along the JJ line of the front view. The perspective view which shows the perspective structure of the division body about the 2nd modification of the spacer for water jackets of 1st Embodiment. (A) The front view which shows the front structure of the 1st convex part of the 1st division body about the 2nd modification of the spacer for water jackets of the 1st embodiment. (B) The front view which shows the front structure of the 2nd convex part of the 2nd division body about the 2nd modification of the spacer for water jackets of the 1st embodiment. The perspective view which shows the partial cross section perspective structure of the holder about the 2nd modification of the spacer for water jackets of the said 1st Embodiment. (A) The perspective view which shows the perspective structure before providing external force to the holder about the 2nd modification of the spacer for water jackets of the 1st embodiment. (B) Sectional drawing which shows the partial cross section structure of the holder vicinity before giving external force to the holder about the spacer. (A) The perspective view which shows the perspective structure after giving external force to the holder about the 2nd modification of the spacer for water jackets of the 1st embodiment. (B) Sectional drawing which shows the partial cross-section structure of the holder vicinity after giving external force to the holder about the spacer. (A) The perspective view which shows the perspective structure before providing external force to the holder about the 3rd modification of the spacer for water jackets of 1st Embodiment. (B) The front view which shows the front structure before giving external force to the holder about the spacer. (A) The perspective view which shows the perspective structure after giving external force to the holder about the 3rd modification of the spacer for water jackets of the 1st embodiment. (B) The front view which shows the front structure after giving external force to the holder about the spacer. (A) The perspective view which shows the perspective structure of the spacer before giving external force to the holder about the spacer for water jackets concerning 2nd Embodiment. (B) The front view which shows the front structure of the spacer before providing external force to the holder about the spacer. (A) The perspective view which shows the perspective structure of the spacer before providing external force to the holder about the spacer for water jackets of the said 2nd Embodiment. (B) The front view which shows the front structure of the spacer before providing external force to the holder about the spacer. (A) The perspective view which shows the perspective structure before providing external force to the holder about the spacer for water jackets of 3rd Embodiment. (B) The front view which shows the front structure before giving external force to the holder about the spacer. (A) The perspective view which shows the perspective structure after giving external force to the holder about the spacer for water jackets of the 3rd embodiment. (B) The front view which shows the front structure after giving external force to the holder about the spacer. (A) The perspective view which shows the perspective structure before providing external force to the holder about the 1st modification of the spacer for water jackets of the 3rd embodiment. (B) The front view which shows the front structure before giving external force to the holder about the spacer. (A) The perspective view which shows the perspective structure after giving external force to the holder about the 1st modification of the spacer for water jackets of the 3rd embodiment. (B) The front view which shows the front structure after giving external force to the holder about the spacer. (A) The perspective view which shows the perspective structure before providing external force to the holder about the 2nd modification of the spacer for water jackets of the 3rd embodiment. (B) The front view which shows the front structure before giving external force to the holder about the spacer. (A) The perspective view which shows the perspective structure after giving external force to the holder about the 2nd modification of the spacer for water jackets of the 3rd embodiment. (B) The front view which shows the front structure after giving external force to the holder about the spacer.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Cylinder, 10a ... Cylinder outer peripheral surface, 10b ... Upper deck part, 11 ... Cylinder liner, 12 ... Water jacket, 13 ... Outer wall, 14 ... Bottom wall, 20, 120, 220, 320, 420, 520, 620, 720 ... Spacer, 21, 121, 221, 321, 521, 621, 721 ... 1st divided body, 21a, 22a ... 1st recessed part, 21b, 22b ... 2nd recessed part, 21c, 22c ... 3rd recessed part, 21d , 22d ... fourth recess, 21e, 22e ... first enlarged diameter part, 21f, 22f ... second enlarged diameter part, 22, 122, 222, 322, 522, 622, 722 ... second divided body, 23, 123, 223, 323, 525, 624, 723 ... retainer, 23a ... first projection, 23b ... second projection, 23c ... third projection, 23d ... first through hole, 23e 2nd through-hole, 23f ... 3rd through-hole, 23g ... protrusion part, 24 ... adjacent part, 121a, 122a ... recessed part, 121b, 122b ... opening part, 121c, 122c ... 1st accommodating part, 121d, 122d ... 2nd accommodating part, 121e, 122e ... end face, 123a ... convex part, 221a ... 1st convex part, 221b, 222b ... end face, 221c ... projecting part, 221d ... end face, 221e, 221f, 222e, 222f ... groove 222a ... second convex portion, 222c ... end face, 222d ... insertion hole, 223a, 223b ... projection portion, 321a, 322a ... convex portion 323a, 323b ... concave portion, 323c, 323d ... sliding portion, 323e, 323f ... first 1 accommodating portion, 323g, 323h, second accommodating portion, 521a, 522a, projecting portion, 523, separating member, 524, elastic member, 621a, 62 a ... concave portion, 623 ... spacing member, 623a ... enlarged diameter portion, 623b ... pressure receiving portion, 721a, 722a ... first convex portion, 721b, 722b ... second convex portion, 723a, 723b ... inclined portion, 723c ... first 1 recess, 723d 2nd recess, 723e 3rd recess, 723f 4th recess.

Claims (12)

In a water jacket spacer disposed in a water jacket formed in a cylinder block of an internal combustion engine,
The area of the inner circumference corresponding to the outer circumference of the cylinder facing the water jacket is divided and the area formed by the inner circumference when arranged close to each other is equal to or smaller than the outer circumference of the cylinder. A plurality of divided bodies,
A state in which the divided bodies are separated from each other so that the size of the region formed by the inner circumference of the plurality of divided bodies arranged corresponding to the shape of the outer circumference of the cylinder is larger than the dimension of the outer circumference of the cylinder The holder that moves with the application of an external force and brings the divided bodies close to each other so that the size of the region formed by the inner circumference of the plurality of divided bodies is equal to or smaller than the outer circumference of the cylinder. A water jacket spacer for a cylinder block of an internal combustion engine. In the water jacket spacer of the cylinder block according to claim 1,
The holder has a mechanism for holding a state in which the divided bodies are brought close to each other so that a dimension of an area formed by inner circumferences of the plurality of divided bodies is equal to a dimension of the outer circumference of the cylinder. Spacer for water jacket of cylinder block. The mechanism for holding the divided bodies apart from each other and the mechanism for holding the divided bodies close to each other include a convex portion formed on one of the divided bodies and the holder. The spacer for the water jacket of the cylinder block according to claim 2, wherein the spacer is realized by fitting into a recess formed in the cylinder. The recesses are formed so as to extend along the axial direction of the cylinder and to form a pair straddling the adjacent portions of the divided bodies, and the pair of recesses are portions close to end portions on the side to which the external force is applied. So that they are close to each other,
The convex portions are formed in a pair so as to fit into the pair of concave portions,
From the state in which the divided bodies are separated from each other by moving the divided body and the holder relative to each other in the axial direction of the cylinder by the external force in a state where the pair of convex portions are fitted in the pair of recessed portions. The spacer for a water jacket of a cylinder block according to claim 3, wherein the divided bodies are changed to a state in which they are brought close to each other. In the water jacket spacer of the cylinder block according to claim 1,
The holder has a mechanism for pulling the plurality of divided bodies together so that the size of the region formed by the inner circumference of the plurality of divided bodies is equal to or less than the size of the outer circumference of the cylinder. Water jacket spacer. Each of the adjacent divided bodies in the divided body includes a pair of first protrusions protruding outward in the radial direction of the cylinder from the outer peripheral surface of the divided body when the spacer is mounted on the cylinder block. When the spacer is mounted on the cylinder block, the spacer is positioned on the bottom side of the water jacket with respect to the first protrusion, and the pair of protrusions are separated from each other than the first protrusion. And a pair of second protrusions disposed on the holder, and the holder has two pairs of second protrusions that hold the first protrusion and the second protrusion so that the divided bodies are separated from each other. And a pair of second concave portions that hold the first convex portion and the second convex portion so that the divided bodies are close to each other, and the first convex portion and the second convex portion are provided. The protrusions are inserted into the first recesses so that the divided bodies are 6. It hold | maintains in the state spaced apart, The said 1st convex part and 2nd convex part are hold | maintained in the state which made the said division bodies approach by inserting in the said 2nd recessed part. The spacer for the water jacket of the described cylinder block. The said holding tool has a part which protrudes in the bottom part side of the said water jacket rather than the said division body, when the said holding tool is assembled | attached to the said division bodies. The spacer for the water jacket of the described cylinder block. In the mounting method of the water jacket spacer disposed in the water jacket formed in the cylinder block of the internal combustion engine to the cylinder block,
The area of the inner circumference corresponding to the outer circumference of the cylinder facing the water jacket is divided and the area formed by the inner circumference when arranged close to each other is equal to or smaller than the outer circumference of the cylinder. Arranging the plurality of divided bodies corresponding to the shape of the outer periphery of the cylinder;
A holder between the adjacent divided bodies so that the dimension of the region formed by the inner circumference of the plurality of divided bodies arranged corresponding to the outer circumferential shape of the cylinder is larger than the outer circumferential dimension of the cylinder. The process of assembling
When the spacer is disposed in the water jacket, an external force is applied to the holder to move the holder so that the size of the region formed by the inner circumferences of the plurality of divided bodies is the outer circumference of the cylinder. And a step of bringing the divided bodies close to each other so as to be less than or equal to the dimensions of the above. A method for mounting a spacer for a water jacket to a cylinder block. The step of bringing the divided bodies close to each other includes moving the holder by bringing the holder into contact with the bottom of the water jacket when the spacer is disposed in the water jacket. The method for mounting the water jacket spacer to the cylinder block according to claim 8, wherein the split bodies are brought close to each other so that a dimension of an area formed by the inner circumference of the cylinder is equal to or less than a dimension of the outer circumference of the cylinder. In the step of bringing the divided bodies close to each other, after the spacer is disposed in the water jacket, the holder is brought into contact with the cylinder head when the cylinder head of the internal combustion engine is assembled to the cylinder block. The water jacket according to claim 8, wherein the water jacket according to claim 8 is a step of moving the tool and bringing the divided bodies close to each other so that a dimension of an area formed by inner circumferences of the plurality of divided bodies is equal to or less than an outer circumference of the cylinder. How to install spacer for cylinder on cylinder block. In the step of assembling the holders between the adjacent divided bodies, the size of the region formed by the inner circumferences of the plurality of divided bodies arranged corresponding to the shape of the outer circumference of the cylinder is larger than the dimensions of the outer circumference of the cylinder. A step of providing a separating means so as to be larger, and a step of providing a moving means for drawing the plurality of divided bodies arranged corresponding to the shape of the outer periphery of the cylinder, and bringing the divided bodies close to each other After the spacer is disposed in the water jacket, the spacing means is removed by an external force, and the dimension of the region formed by the inner circumference of the plurality of divided bodies is the dimension of the outer circumference of the cylinder. It consists of the process which makes the said division bodies adjoin so that it may become the following. The spacer for water jackets of Claim 8 to the cylinder block Wearing method. In the internal combustion engine in which the spacer for the water jacket is disposed in the water jacket formed in the cylinder block of the internal combustion engine,
The spacer has an inner peripheral shape corresponding to the outer peripheral shape of the cylinder facing the water jacket, is divided, and the size of the region formed by the inner periphery when arranged close to each other is the same as that of the cylinder. The dimension of the area formed by the plurality of divided bodies that are equal to or smaller than the outer circumference and the inner circumference of the plurality of divided bodies arranged corresponding to the outer circumference of the cylinder is larger than the outer circumference of the cylinder. The divided bodies are held in a separated state so that the dimension of the region formed by the inner circumference of the plurality of divided bodies is equal to or less than the outer circumference of the cylinder. An internal combustion engine comprising: a holder that holds the divided bodies in a state of being close to each other.

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