JP2018178843A - Spacer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel spacer capable of increasing the amount of a compressed porous body provided in a portion including a convex portion of a support arranged in a cooling water flow path to be restored in the convex portion. A spacer is arranged in a cooling water flow path 3 formed in a cylinder block 1 of an internal combustion engine 10 so as to surround a cylinder bore 2. It includes a support 7 made of a rigid material having a convex portion 71, and a porous body 8 attached to a side surface 7a of the support 7 including the convex curved surface 71 of the convex portion 71. The porous body 8 has a property of being maintained in a compressed state and being restored to a state before compression when a predetermined external factor is added. A slit 81 that opens on the opposite side of the support 7 is formed in the portion of the porous body 8 that corresponds to the convex portion 71. [Selection diagram] Fig. 1

Description

  The present invention relates to a spacer disposed in a cooling water flow passage formed to surround a cylinder bore in a cylinder block of an internal combustion engine.

  In the cooling water flow path of the internal combustion engine, a spacer for regulating the flow (flow rate, flow rate, etc.) of the circulating cooling water is inserted from the opening and disposed (see, for example, Patent Documents 1 to 3). In the spacers (regulating members) disclosed in these Patent Documents 1 to 3, the surface on the cylinder bore side of the spacer body (supporter) made of a rigid body such as synthetic resin swells when it contacts the cooling water, and the cooling water flow path The member which contacts the wall surface by the side of the cylinder bore of is attached. Thus, the members attached to the spacer main body are bulky (thin) before being enlarged, so that when the spacer is inserted into the cooling water flow path, the insertion resistance is reduced to facilitate the insertion. After being disposed in the cooling water flow path, it is expanded to regulate the flow of the cooling water.

JP, 2014-194219, A WO 2016/104478 JP, 2016-128256, A

  By the way, when the cylinder block has a plurality of cylinder bores, the cooling water flow path formed so as to surround the plurality of cylinder bores has a constricted portion facing toward the cylinder bore in the adjacent cylinder bore portion. Therefore, in the spacer disposed in the cooling water flow path, a convex curved portion facing the cylinder bore is formed corresponding to the constriction. In the spacer disclosed in the patent document, the member to be expanded is attached to the surface on the cylinder bore side of the spacer main body, and in terms of the insertability of the spacer into the cooling water flow path and the regulation of cooling water flow. It is valid.

  Then, in the process of putting the spacer shown in Patent Document 2 and Patent Document 3 into practical use, the applicant has devised to provide a porous body as the member to be expanded in the convex curved portion, and further, We also found that the following problems occur. FIGS. 8 (a) and 8 (b) are diagrams showing a state where such a problem occurs. The spacer 102 shown in FIG. 8 is a spacer main body 103 having a shape to be inserted into the cooling water flow passage 101 formed in the cylinder block 100 and a porous body integrated with the cylinder bore (see FIG. 1) side surface 103 a of the spacer main body 103. It is composed of a body 104. The porous body 104 is made of a cellulose-based sponge similar to the example shown in Patent Document 2 or Patent Document 3. In FIG. 8, the spacer main body 103 has a convex curved portion 103b at a position corresponding to the inter-bore portion (see FIG. 1) of the cooling water flow channel 101, and the porous body 104 has the convex curved surface of the convex curved portion 103b. It is integrally attached to the cylinder bore side surface 103a of the containing spacer main body 103. FIG. 8A shows a state in which the spacer 102 in which the spacer main body 103 and the porous body 104 maintained in the compressed state are integrated is disposed in the cooling water flow passage 101 of the cylinder block 100. Further, FIG. 8B shows a state in which the cooling water is introduced into the cooling water flow passage 101, and the porous body 104 is restored to the state before compression by coming into contact with the cooling water.

  As shown in FIG. 8 (b), when the porous body 104 comes in contact with the cooling water, it tries to restore the state before compression. In FIG. 8B, arrows a1 and a2 indicate the restoration direction of the porous body 104, which is the direction opposite to the compression direction of the porous body 104. More specifically, in the curved portion other than the convex curved surface of the convex curved portion 103b, the porous body 104 is restored in the direction a1 facing the center of curvature (center of cylinder bore) of the curved surface, and the convex of the convex curved portion 103b The curved surface portion is restored in the direction a2 to which the top of the convex curved portion 103b is directed. By this restoration, the porous body 104 in the curved surface portion other than the convex curved surface portion of the convex curved portion 103b abuts on the cylinder bore side wall surface (inner inner wall surface) 101a of the cooling water flow channel 101. However, in the portion of the porous body 104 corresponding to the convexly curved portion 103b, the surface length in the direction shown by the arrow b needs to be long after restoration, so if the expansion performance of the porous body is low, the porosity of this portion The mass 104 is not sufficiently restored in the restoration direction a2. As a result, a gap is formed between the porous body 104 in the convex curved portion 103b and the cylinder bore side wall surface 101a of the cooling water flow passage 101, and the cooling water flowing in this portion can not be sufficiently regulated.

  The present invention has been made in view of the foregoing, and provides a novel spacer capable of increasing the amount by which a porous body in a compressed state provided in a portion including a convexly curved portion of a support restores in the convexly curved portion. The purpose is that.

  A spacer according to the present invention is a spacer disposed in a cooling water flow path formed so as to surround a cylinder bore in a cylinder block of an internal combustion engine, the support made of a rigid material having a convex curved portion, and the support And a porous body attached to a side surface including the convex curved surface of the convex curved portion, wherein the porous body is maintained in a compressed state, and is compressed before a predetermined external factor is added. It has a characteristic to be restored to the state, and a slit corresponding to the convex curved portion of the porous body is formed with a slit opening on the opposite side to the support.

  In the porous body attached to the convexly curved portion of the support, when the porous body has low elongation performance at the time of restoration of the porous body, this becomes an inhibiting factor, and the porous body in the convexly curved portion is The original restoration can not be done sufficiently. However, according to the spacer according to the present invention, since the porous body in this portion is provided with the slit, the expansion of the porous body can be compensated by the expansion of the opening width of the slit. Therefore, even if the expansion performance of the porous body is low, the influence thereof is alleviated, and the amount of recovery when the porous body in this portion is restored from the compressed state to the state before compression is achieved.

In the spacer according to the present invention, the slit is formed to extend in the depth direction of the cooling water flow channel, and the length of the slit along the depth direction of the cooling water flow channel is the length of the porous body It may be formed to be shorter than the length along the depth direction of the cooling water channel.
According to this, since the slit does not extend to the entire depth direction of the porous body, the concern of breakage of the porous body starting from the slit can be reduced at the time of handling such as when integrating the porous body to the support. can do.

In the spacer according to the present invention, a plurality of the slits may be formed in the depth direction of the cooling water flow path and in the circumferential direction of the cooling water flow path.
According to this, the plurality of slits formed in the depth direction and the circumferential direction substantially increase the sum of the opening widths of the slits, and the porous body in the portion corresponding to the convexly curved portion is in a compressed state It is possible to more effectively increase the amount of restoration when restoring to the state before compression.

In the spacer according to the present invention, the support may be made of a hard synthetic resin, and may be integrally molded with the porous body, and the slit may have a shape that does not open toward the support. .
According to this, when the support and the porous body are integrally molded, the resin which is the material of the support does not flow into the slit, so the effect of increasing the amount of restoration by the slit is maintained.

In the spacer according to the present invention, the porous body may be made of a cellulose sponge in a compressed state, and the addition of the external factor may be that the cellulose sponge is in contact with water.
According to this, in the case of a cellulose-based sponge having a low elongation performance, the effect of increasing the amount of restoration by the slits is more suitably exhibited.

In the spacer according to the present invention, a plurality of the cylinder bores may be arrayed, and the convex curved portion may be configured to project toward a portion between adjacent cylinder bores.
According to this, it is possible to improve the function of the porous body for restricting the flow of the cooling water in the portion between the cylinder bores in the cooling water flow path.

  According to the spacer according to the present invention, the amount by which the porous body in the compressed state provided in the portion including the convexly curved portion of the support can be restored at the convexly curved portion can be increased.

FIG. 1 is a schematic cross-sectional plan view showing a first embodiment of a spacer according to the present invention in which the spacer is disposed in a coolant flow passage of an internal combustion engine. (A) is an enlarged view of part X in FIG. 1, and (b) shows a state in which the cooling water comes in contact with the porous body from the state of (a) and the porous body is restored to the state before compression ( It is the same as a). (A) is a cross-sectional view taken along line YY in FIG. 1; (b) is a state in which the cooling water comes in contact with the porous body from the state of (a) and the porous body is restored to the state before compression Is a view similar to (a) showing (A) is the figure which looked at the part containing the convex curve part of the spacer of the embodiment from the cylinder bore side, (b) and (c) are the same figures showing the modification. (A) and (b) are the same as FIG. 4 (a) which shows another modification. It is a figure similar to FIG. 1 which shows 2nd Embodiment of the spacer which concerns on this invention. It is a figure which shows 3rd Embodiment of the spacer which concerns on this invention, Comprising: The figure of the principal part like FIG. 1, and the elements on larger scale of the state which the porous body expanded. (A) and (b) show the conventional spacer in which the porous body is attached to the convexly curved portion of the support, and (a) shows the convexly curved portion showing a state where the spacer is disposed in the cooling water channel of the internal combustion engine It is a cross-sectional view of the part containing, (b) is a figure which shows the state which cooling water contacted the porous body from the state of (a), and the porous body was restored to the state before compression. is there.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 7. 1 to 5 show a first embodiment of the spacer according to the present invention, and FIG. 1 shows a state in which the spacer of the embodiment is inserted into the cooling water flow path 3 of the cylinder block 1 in the internal combustion engine 10. It shows. A cylinder block 1 shown in FIG. 1 constitutes a three-cylinder automobile engine (internal combustion engine) 10, and three cylinder bores (cylinders) 2... Are provided in series in an adjacent state. Designated by 1a are insertion holes for bolts (not shown) for unitarily fastening the cylinder head 9 to the cylinder block 1 through the head gasket 9a (see FIG. 3B). An open deck type groove-shaped cooling water passage 3 is formed in series around the three cylinder bores 2. At an appropriate position of the cylinder block 1, a cooling water inlet 4 and a cooling water outlet 5 communicating with the cooling water flow path 3 are provided. The cooling water outlet 5 is connected by piping to a radiator (not shown), and the outlet side of the radiator is connected by piping to the cooling water inlet 4 via a water pump (not shown). Thus, the cooling water (including the antifreeze liquid) is circulated between the cooling water flow path 3 and the radiator. When the cooling water flow path (not shown) is provided also in the cylinder head 9, the cooling water flow path 3 of the cylinder block 1 and the cooling water flow path of the cylinder head 9 communicate with each other. In this case, the cylinder block 1 may not have the cooling water outlet, and the cylinder head 9 is provided with a cooling water outlet, to which a pipe connected to a radiator is connected.

  The cooling water flow path 3 has arc-shaped portions 3a ... formed so as to surround the cylinder bores 2 and necked portions 3b ... formed so as to be close to each other in a portion between the adjacent cylinder bores 2 ing. The groove width of the constricted portion 3 b is made larger than the groove width of the other arc-shaped portion 3 a of the cooling water flow path 3. The inner wall surface (inner inner wall surface) 3c on the side of the cylinder bore 2 formed to correspond to the arc-shaped portion 3a ... and the constricted portion 3b on the both inner wall surfaces of the cooling water flow path 3 The inner wall surface (outer inner wall surface) 3d of In each cylinder bore 2, there is provided a piston 20 which reciprocates along its axial direction, and the piston 20 is in sliding contact with the inner peripheral surface 2aa of the cylinder bore wall 2a via a piston ring 20a attached to the outer periphery thereof. It is configured to earn. In the present embodiment, the circumferential direction d of the cooling water flow path 3 is a direction based on an annular shape surrounding the cylinder bores 2... In a state where the cylinder bores 2. The depth direction c of the cooling water flow passage 3 is a direction perpendicular to the circumferential direction d of the cooling water flow passage 3 and along the central axis of each cylinder bore 2.

  The spacer 6 according to the present embodiment is a spacer disposed in the cooling water flow path 3 and includes the support 7 made of a rigid material having a convex curved portion 71 and the convex curved surface 71 a of the convex curved portion 71 in the support 7. And a porous body 8 attached to the side surface 7a. The porous body 8 is made of a material that is maintained in the compressed state and has the property of being restored to the state before compression in response to the addition of a predetermined external factor. In the curved portion 8 b corresponding to the convexly curved portion 71 of the support 7 in the porous body 8, a slit 81 opened on the opposite side to the support 7 is formed. The support 7 in the present embodiment is formed of a molded body of a hard synthetic resin (made of a rigid material) in a cylindrical shape corresponding to the entire shape of the cooling water flow passage 3 and corresponds to the constriction shaped portions 3 b of the cooling water flow passage 3. In the portion to be projected, convex curved portions 71... Projecting toward the portion between the cylinder bores 2, 2. The porous body 8 is integrally fixed to the side surface (inner surface) 7 a on the cylinder bore 2 side including the convex curved surface 71 a of the convex curved portion 71. That is, the porous body 81 is fixed so as to cover a part of the convex curved surface 71 a of the convex curved portion 71. The slit 81 is formed in the curved portion 8 b corresponding to the convex curved portion 71 in the porous body 8 and is formed to extend in the depth direction c of the cooling water flow path 3 (see FIG. 3A). . The curved portion 8b of the porous body 8 is formed along the convexly curved portion 71 of the support 7, and the side surface on the cylinder bore 2 side is formed into a curved surface having a larger radius of curvature than the side surface on the support 7 side. . More specifically, the slit 81 is located in a portion of the curved portion 8 b of the porous body 8 corresponding to the center of the convexly curved portion 71. Further, the slit 81 in the present embodiment is formed in a notch shape which is open on the cylinder bore 2 side (opposite side to the support 7) but not on the support 7 side. Specifically, the slit 81 is formed by cutting the porous body 8 so as not to penetrate, and the width is narrowed as going from the cylinder bore 2 side to the support 7 side. As a formation aspect containing the number of objects of the slit 81, various examples as shown to FIG. 4 (a) (b) (c) and FIG. 5 (a) (b) are employ | adopted. Examples of this formation mode will be described later.

  The porous body 8 is made of a cellulose sponge in a compressed state, and the cellulose sponge is maintained in a compressed state, and when it comes in contact with water, this becomes an addition of an external factor and it is restored to the state before compression. It has a characteristic. More specifically, the cellulose-based sponge is a natural material comprising cellulose derived from pulp and natural fibers (eg, cotton etc.) added as reinforcing fibers. Cellulose has a hydrophilic group (OH) and is chemically compatible with moisture. In addition, a cellulose-based sponge is a porous material, and when dried in a pressurized state, cellulose molecules form hydrogen bonds and are maintained in a compressed state, and when exposed to moisture from this state, water molecules are cellulose It has the property of dissociating hydrogen bonds between molecules and restoring them from the compressed state. Integration of the cellulose-based sponge (porous body 8) to the support 7 is achieved by insert-molding the cellulose-based sponge in the compressed state together with the support 7. Therefore, the cellulose-based sponge is fixed to the support 7 in a state where a part of the resin material constituting the support 7 is impregnated in the cellulose-based sponge. Since the slits 81 of the porous body 8 do not open toward the support 7 side, when the porous body 8 is insert-molded together with the support 7, the resin constituting the support 7 is a slit. Penetration into 81 is suppressed.

  The spacer 6 configured as described above is inserted into the cooling water flow path 3 of the internal combustion engine 10 through the opening 30 thereof. 1, 2 (a) and 3 (a) show a state in which the spacer 6 is disposed in the cooling water flow path 3. Since the porous body 8 is maintained in a compressed state when arranging the spacer 6 in the cooling water flow path 3, the porous body 8 hardly interferes with the inner inner wall portion 3 c of the cooling water flow path 3 and is inserted smoothly. Be done. Then, as shown in FIG. 3B, the cylinder head 9 is integrally fastened to the upper surface of the cylinder block 1 via the head gasket 9a, and then the cooling water w is supplied from the cooling water inlet 4 into the cooling water flow path 3. be introduced. The piston 20 in the cylinder bore 2 repeatedly moves up and down by the explosive action of the combustion gas in the combustion chamber 90 of the cylinder head 9, and the internal combustion engine 10 is put into operation.

  As described above, when the cooling water w is introduced into the cooling water flow path 3, the cooling water w contacts the porous body 8 made of a cellulose-based sponge, and the porous body 8 is restored to the cylinder bore 2 side To the compression direction). Along with this restoration, the surface 8 a of the porous body 8 abuts on the inner inner wall 3 c of the cooling water channel 3. In addition, when restoring the porous body 8, a force to expand the surface of the curved portion 8b on the cylinder bore 2 side in the circumferential direction d of the cooling water flow path 3 (in order to expand the surface of the curved portion 8b in the surface area direction Power) works. At this time, since the slit 81 extending in the depth direction c of the cooling water flow path 3 is formed in the curved portion 8 b corresponding to the convexly curved portion 71 of the porous body 8, the porous body 8 is restored. The opening width of the slit 81 is expanded to compensate for the elongation shortage of the porous body 8. Therefore, even if the expansion performance of the porous body 8 is low, the influence thereof is alleviated, and the amount of restoration when the curved portion 8b of the porous body 8 is restored from the compressed state to the state before compression is achieved. By this, the curved portion 8b of the porous body 8 abuts against the opposing inner inner wall surface 3c, the flow of the cooling water w is restricted, and the space between the convex curved portion 71 of the support 7 and the inner inner wall surface 3c is appropriate. Can be cooled.

FIGS. 4 (a), (b) (c) and FIGS. 5 (a) (b) show various forms of forming the slits 81 formed in the porous body 8. FIG.
In the example shown in FIG. 4A, two slits 81 and 81 along the depth direction c of the cooling water flow path 3 at the portion of the porous body 8 corresponding to the center of the convexly curved portion 71 of the support 7. Is formed. Further, three slits 81... Are formed in the vicinity of both sides of the central slit 81 along the depth direction c. That is, a plurality of slits 81 are formed in the circumferential direction d by being formed in the center and in the vicinity of both sides thereof. The central slit 81 and the slits 81 on both sides thereof are disposed so as to partially overlap with each other as viewed in the circumferential direction d of the cooling water channel 3. In this example, since the length along the depth direction c of any of the slits 81 does not extend to the entire depth direction c of the porous body 8, the porous body 8 is integrated with the support 7 At the time of handling such as when, it is possible to reduce the concern that the porous body 8 is torn from the slit 81 as a starting point. In addition, the plurality of slits 81 formed in the depth direction c and the circumferential direction d substantially increase the sum of the opening widths of the slits 81. 8 can more effectively increase the amount of restoration when restoring from the compressed state to the state before compression. Further, since the slits 81 are not continuous in the entire depth direction c of the porous body 8, the cooling water flow path 3 is formed from the first end of the porous body 8 located on the opening 30 side of the cooling water flow path 3. There is no path through which the cooling water flows to the second end of the porous body 8 located on the bottom wall 31 side of Therefore, the porous body 8 can suitably suppress the flow of the cooling water along the depth direction c of the cooling water flow path 3 in the necked portion 3 b.

  In the example shown in FIG. 4 (b), one slit 81 along the depth direction c of the cooling water flow path 3 at the center of the curved portion 8 b of the porous body 8 corresponds to the depth direction c of the porous body 8. It is formed over the entire width of the In this example, since the length along the depth direction c of the slit 81 extends over the entire width of the porous body 8 in the depth direction c, the slit 81 serves to compensate for the insufficient elongation of the porous body 8. Is effectively exhibited. In the example shown in FIG. 4C, only the two slits 81 and 81 along the depth direction c of the cooling water channel 3 are spaced in the depth direction at the center of the curved portion 8b of the porous body 8 It is formed. In this example, during handling such as when integrating the porous body 8 with the support 7, the concern that the porous body 8 is torn from the slit 81 can be reduced.

In the example shown in FIG. 5A, at the center of the curved portion 8b in the porous body 8, one shorter than the full width in the depth direction c of the porous body 8 along the depth direction c of the cooling water channel 3 Only the slits 81 are formed. In this example, as compared with the example of FIG. 4A, the concern of breakage of the porous body 8 starting from the slit 81 at the time of handling such as when integrating the porous body 8 with the support 7 is reduced. Can. In the example shown in FIG. 5B, four slits 81 are formed in the center of the curved portion 8b of the porous body 8 in a state of being inclined in the same direction d. In this example, although the number of slits 81 is smaller than the example shown in FIG. 4A, the porous body 8 starts from the slit 81 when handling, such as when integrating the porous body 8 with the support 7. Can reduce the risk of tearing. In addition, the total sum of the opening widths of the slits 81 is substantially increased, and the amount of restoration when the curved portion 8b of the porous body 8 is restored from the compression state to the state before compression is more effectively increased. Can be
Formation modes other than the formation modes shown in FIGS. 4 (a), (b) and (c) and FIGS. 5 (a) and 5 (b) are also possible. Depending on the restorability of the body 8 and the like, an appropriate formation mode is adopted as appropriate.

  FIG. 6 shows a second embodiment of a spacer according to the present invention. The spacer 6 of the present embodiment is disposed in a part of the cooling water flow path 3, and the spacer body 7 of the illustrated example extends the support 7 of the first embodiment in the arrangement direction of the cylinder bores 2. The shape is substantially the same as the shape of the right half divided in half by the center line. The same porous body 8 as described above is integrated with the surface (inner surface) 7a on the side of the cylinder bore 2 including the convex curved surface 71a of the convex curved portion 71 located in the portion between the bore 2 and 2 of the support 7. In the portion corresponding to the convexly curved portion 71 of the porous body 8, a slit 81 is formed in the same manner as described above.

The spacer 6 of this embodiment is integrated with the support 7 in a state in which the porous body 8 is maintained in a compressed state, and in this state is inserted into the cooling water flow path 3 from the opening 30 (see FIG. 3) Will be placed. FIG. 6 shows a state in which the spacer 6 is disposed in the cooling water flow path 3. At the time of this insertion, since the porous body 8 is in a compressed state, there is little concern that the porous body 8 will be a factor of insertion resistance. Then, as in FIG. 3B, the cylinder head 9 is integrally fastened to the upper surface of the cylinder block 1, and the internal combustion engine 10 is assembled. After that, when the cooling water is introduced from the cooling water inlet 4, the cooling water comes in contact with the cellulose-based sponge constituting the porous body 8, and the cellulose-based sponge is restored to the state before compression. Restore and expand in the width direction. By the restoration of the cellulose-based sponge, the surface 8 a of the porous body 8 abuts on the inner inner wall surface 3 c of the cooling water channel 3. Since the slits 81 are formed in the curved portion 8 b of the porous body 8 in the same manner as in the above example, it is possible to increase the restoration of the curved portion 8 b when restoring the porous body 8. Then, even after this contact, the cellulose-based sponge receives a reaction force along with the restoration of the cellulose-based sponge, so that the support 7 is displaced so as to be pressed against the outer inner wall surface 3 d of the cooling water passage 3. Further, since the restored cellulose-based sponge (porous body 8) is positioned to face the flow of the cooling water flowing in the cooling water flow path 3, it functions as a control means for restricting the flow of the cooling water, The performance of water flow control of the spacer 6 can be improved.
The other configuration is the same as that of the first embodiment, so the same reference numerals are given to the common parts and the description thereof will be omitted.

  FIG. 7 shows a third embodiment of a spacer according to the present invention. In the present embodiment, the support 7 has a convex curved portion 72 projecting to the side opposite to the cylinder bore 2, and the porous body 8 made of a cellulose-based sponge includes the cylindrical curved surface 72 a of the convex curved portion 72. And is integrated with the opposite surface (outer surface) 7b. In the illustrated example, the groove width of a part of the arc portion shaped portion 3a in the cooling water flow path 3 is widened on the opposite side to the cylinder bore 2 and the outer inner wall surface 3d is bent at two points on the opposite side to the cylinder bore 2 It is formed in the curved shape containing a part. The support 7 is curved in the side opposite to the cylinder bore 2 so as to substantially follow the outer inner wall surface 3 d at this widening portion. Therefore, the convexly curved portions 72 are formed at two places so as to correspond to the curved shape portions of the outer inner wall surface 3d. Then, in the curved portion 8 b corresponding to the respective convexly curved portions 72, 72 of the support 7 in the porous body 8, slits 81 similar to the above are formed. The slit 81 is formed in a notch shape which is open on the side opposite to the support 7 (outside inner wall surface 3 d side) but not on the support 7 side. Further, in the present embodiment, the slit 81 is opened on the side opposite to the cylinder bore 2 side (opposite to the support 2).

The spacer 6 of the present embodiment is also inserted into the cooling water flow path 3 from the opening 30 (see FIG. 3) and disposed. Then, the cylinder head 9 (see FIG. 3B) is fastened and integrated to the upper surface of the cylinder block 1, and the internal combustion engine 10 is assembled. Thereafter, when the cooling water is introduced into the cooling water flow path 3 from the cooling water inlet 4, the cooling water comes in contact with the cellulose-based sponge constituting the porous body 8, and the cellulose-based sponge is restored to the state before compression. Thus, the cooling water flow path 3 is restored in the width direction and expanded. By the restoration of the cellulose-based sponge, the surface 8 a of the porous body 8 abuts on the outer inner wall 3 d of the cooling water channel 3. The enlarged view in FIG. 7 shows a state in which the porous body 8 is expanded, and the portion corresponding to the convex curved portion 72 is in contact with the outer inner wall surface 3 d of the opposing cooling water flow path 3. Such an expanded state of the porous body 8 similarly occurs in the other convex curved portion 72. And since the slit 81 is formed in the curved part 8b corresponding to the convex curved surface 72 of the porous body 8 similarly to the said example, the convex curve part in the case of the decompression | restoration of the porous body 8 similarly to the said example The amount of restoration of the portion corresponding to 72 can be increased.
The other configuration is the same as that of the above example, so the same reference numerals are given to the common parts and the description thereof is omitted.

In addition, although a thing of various kinds is mentioned as a cellulose type sponge, it is not specifically limited. For example, fine particles having a very small bubble size, small particles having a small bubble size, or medium particles having a medium bubble may be used. Specifically, a cellulose-based sponge having a bubble size (diameter) of about 0.1 to 5 mm may be used. The size of these bubbles is determined by the particle size of crystalline sodium sulfate used in the process of producing the cellulose sponge. Moreover, although a thing based on cellulose and a reinforcement fiber is preferable, a cellulose type sponge is not limited to this, You may be comprised only by cellulose. In addition to cellulose sponges, cellulose sponges are cellulose derivatives in which hydroxyl groups of cellulose are left to such an extent that they can be kept compressed, for example, sponges comprising cellulose ethers, cellulose esters, etc. It may be selected from any of sponges composed of these mixtures.
Further, as a material constituting the porous body 8, a foam which is maintained in a compressed state by a water-swellable sponge, a water-soluble binder, or a binder which dissolves at a predetermined temperature or more other than the cellulose sponge It may consist of a non-foamable porous body.
Further, the integration of the porous body 8 with the support 7 is not limited to insert molding, but may be performed by mechanical fixing using an adhesive or the like or a suitable jig.

  Further, the slit 81 is not limited to a shape that opens on the opposite side to the support 7 in the compressed state of the porous body 8, and in the compressed state of the porous body 8, the slit 81 is porous. It is sufficient if it can be opened at the time of expansion of the mass body 8. The size of the slit 81 may be changed as appropriate. For example, instead of cutting the porous body 8, the slit 81 may be formed by removing a part of the porous body 8. In addition, although the slit 81 formed in the porous body 8 is described as an example in which the slit 81 is not opened on the support 7 side, one opened on the support 7 side can also be adopted. In particular, when the support 7 and the porous body 8 are integrated by a method other than insert molding (for example, when integrating by adhesion or when the support 7 is made of a material other than a synthetic resin), the slit 81 There is no concern that the support 7 has an opening because there is no concern that the resin may intrude inside. The formation position of the slit 81 is not limited to the center of the curved portion 8 b of the porous body 8 and may be formed on the proximal end side of the curved portion 8 b. Furthermore, although the spacer main body 7 described the example which consists of a molding of a synthetic resin, as long as it has rigidity more than the raw material which comprises the porous bodies 8, such as metal, it may consist of other materials . Moreover, the position (the position in the circumferential direction d, the position in the depth direction c of the cooling water channel 3) to which the porous body 8 is fixed to the spacer main body 7 or the number of porous bodies 8 (the number in the circumferential direction d, the cooling water channel The number in the depth direction c of 3) is appropriately changed according to the required specifications such as the stability of the spacer 6 in the cooling water flow channel 3, or the cooling function of the cooling water w flowing in the cooling water flow channel 3. May be Further, a plurality of the spacers of the present invention may be disposed in the cooling water flow passage 3, and the number of the disposed spacers may be appropriately changed according to the space in the cooling water flow passage 3, the required specifications, and the like. Furthermore, although the internal combustion engine of 3 cylinders was illustrated as an internal combustion engine to which the spacer of this invention is applied, it is applicable not only to this but to the engine of other cylinder numbers.

DESCRIPTION OF SYMBOLS 10 internal combustion engine 1 cylinder block 2 cylinder bore 3 cooling water flow path 6 spacer 7 support body 7a, 7b support side surface 71, 72 convex curved portion 71a, 72a convex curved surface 8 porous body 81 slit c depth direction d circumferential direction w cooling water

Claims (6)

A spacer disposed in a cooling water flow passage formed to surround a cylinder bore in a cylinder block of an internal combustion engine, the spacer comprising:
A support made of a rigid material having a convex curved portion;
A porous body attached to a side surface including the convex curved surface of the convex curved portion in the support;
The porous body has a property of being maintained in a compressed state, and restored to a pre-compression state upon the addition of a predetermined external factor,
A spacer characterized in that a slit corresponding to the convex curved portion of the porous body is formed with a slit opening on the opposite side to the support. In the spacer according to claim 1,
The slit is formed to extend in the depth direction of the cooling water flow path, and the length of the slit along the depth direction of the cooling water flow path is the depth direction of the cooling water flow path of the porous body A spacer characterized in that it is formed to be shorter than the length along. In the spacer according to claim 2,
A plurality of the slits are formed in the depth direction of the cooling water flow path and in the circumferential direction of the cooling water flow path. The spacer according to any one of claims 1 to 3.
The spacer, wherein the support is made of a hard synthetic resin and is integrally molded with the porous body, and the slit does not open toward the support. The spacer according to any one of claims 1 to 4.
The spacer is characterized in that the porous body is made of a cellulose sponge in a compressed state, and the addition of the external factor is that the cellulose sponge comes in contact with water. The spacer according to any one of claims 1 to 5.
The spacer is characterized in that a plurality of the cylinder bores are arranged, and the convex curved portion protrudes toward a portion between adjacent cylinder bores.

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