JP2009068621A - Connecting rod assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting rod assembly at a low cost wherein annular parts press-fitted in a large end and a small end are hardly deformed despite its simple structure. <P>SOLUTION: The connecting rod assembly 1 includes a laminate 2 comprising a plurality of layer sheets 2A, 2B, 2J, 2K, 2L, 2M, and a pair of annular parts 3, 4 which are press-fitted respectively in fitting holes 2aa, 2ba made in the large and small ends 2a, 2b of the laminate 2. The plurality of layer sheets 2A constitute respective parts of a press-worked sheet, and the layer sheets are continuous with each other through continuation parts. The layer sheets 2A are stacked by being folded at the continuous parts. The number of lamination respectively of the large and small ends 2a, 2b in the laminate 2 is made larger than that of the center 2c of the laminate between the large and small ends 2a, 2b. Thus, the thicknesses of the large and small ends 2a, 2b are made thicker than the thickness in the center 2c of the laminate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a connecting rod assembly used in an engine.

A connecting rod used for an engine is manufactured by forging, sintering, or constraining pressure forming from a steel bar or plate material. In addition, it may be formed by stamping by pressing a steel plate. When the connecting rod is manufactured by such forging or sintering, it is difficult to reduce the cost because of the large number of steps. On the other hand, connecting rod assemblies that can be manufactured easily and inexpensively, avoid tilting of the bearings attached to the large and small end portions, and improve bending strength and buckling strength, respectively. And a laminated connecting rod assembly in which plate-shaped divided connecting rod parts having a rod portion are laminated and fixed together are proposed (for example, Patent Document 1).
The connecting rod assembly of Patent Document 1 is configured by stacking divided connecting rod parts and press-fitting annular parts into a large end part and a small end part.
JP 2003-156028 A

  In the conventional laminated connecting rod assembly as described above, the connecting rod laminated parts having the same shape are laminated, and the annular parts are press-fitted into the large end part and the small end part. The formed annular part has a protruding shape. FIG. 10A conceptually shows a state where such a laminated connecting rod assembly is assembled to the engine. FIG. 10B is an enlarged view of a small end portion conceptually showing the phenomenon that occurs in this assembled and used state. The laminated connecting rod assembly 100 shown in the figure laminates two pressed plate-like laminated parts 101, and the annular parts 104, 103 a are inserted into the respective fitting holes 102 a, 103 a of the large end part 102 and the small end part 103. 105 is press-fitted. The annular parts 104 and 105 are made of, for example, a solid circular pipe. FIG. 10B shows the annular part 105 of the small end portion 103, and a bearing in which needle rollers 106 with a cage are arranged in the solid circular pipe. Has been. The large end portion 102 of the laminated connecting rod assembly 100 is fitted and coupled to the crankpin 51 of the crank body 50 via an annular part 104 so as to be relatively rotatable about its axis, and the small end part 103 is constituted by an annular part. Through 105, the piston pin 61 of the piston 60 is fitted and coupled so as to be rotatable about its axis. The crankpin 51 is fixed in an eccentric state between the pair of arms 53 with respect to the crankshaft 52, and a balance weight 53a is formed at a portion of the both arms 53 opposite to the crankpin 51.

  The pair of balance weights 53a are formed so that the interval between the opposing portions is small due to the configuration, and the thickness of the laminate that passes through this narrow gap is limited. Depending on the type of crank, this interval may be small. Therefore, as shown in the figure, the number of stacked plate-like laminated parts 101 cannot be increased, and the annular part 104 press-fitted into the fitting holes 102a and 103a. , 105 bulges on both sides become larger. Thus, since the thickness of the laminated body is thin and the protruding parts of the annular parts 104 and 105 are large, the laminated body is fitted only at the center of the annular ring, as shown in FIG. In addition, the annular component 105 (104) may be deformed into a drum shape due to the concentration of stress on the central portion. Such deformation is not preferable for engine operation.

  An object of the present invention is to provide a connecting rod assembly that has a simple structure and does not cause deformation of an annular part press-fitted into a large end portion and a small end portion at a low cost.

  The connecting rod assembly according to the first invention is press-fitted into a laminated body formed by laminating a plurality of plate-like layer plates, and a fitting hole in a large end portion and a small end portion provided in the laminated body. In the connecting rod assembly having a pair of annular parts, the plurality of layer plates constitute each part of the pressed plate material, and are continued through the continuous part, and are bent at the continuous part. By stacking the number of the large end portion and the small end portion of the laminate more than the number of layers in the central portion of the laminate between the large end portion and the small end portion. The thicknesses of the large end portion and the small end portion are made thicker than the thickness of the central portion of the laminate.

The connecting rod assembly having this configuration is used, for example, as drive transmission means from a piston to a crankshaft in an engine. Specifically, a small end portion is fitted and coupled to a piston pin of a piston through an annular part press-fitted into the fitting hole, and a large end portion is press-fitted into the fitting hole. It is used as drive transmission means for converting and transmitting the reciprocating motion of the piston to the axial rotational motion of the crankshaft by fitting and coupling with the crankpin of the crank via an annular part so as to be relatively rotatable. In this case, the thickness of the central portion of the stacked body, that is, the number of stacked layers, is set so that the center portion of the stacked body can pass through the interval between the pair of balance weights during the drive transmission motion. On the other hand, the large end portion and the small end portion are not restricted by the distance between the balance weights. It is thicker than the thickness of the central part of the laminate. Therefore, the amount of protrusion on both sides of the laminated body of the annular part that is press-fitted into the fitting holes in the large end part and the small end part is reduced, so that the fitting of the annular part to the laminated body is thick. The stress applied to the annular part during engine operation is distributed in the longitudinal direction of the annular part and prevents the drum-like deformation and breakage due to the concentration of stress on the central part as described above. be able to.
In addition, a plurality of layer plates constituting the laminated body constitute each part of a pressed plate material, which are continued through a continuous part, and are laminated by bending at this continuous part. Therefore, processing and assembly are easy, the processing cost of the layer plate and the laminated body can be suppressed, and the cost of the connecting rod assembly can be reduced.

  A connecting rod assembly according to a second aspect of the present invention is a laminated body formed by laminating a plurality of plate-shaped layer plates, and a pair of press-fitted into fitting holes in a large end portion and a small end portion provided in the laminated body. In the connecting rod assembly having the annular part, the plurality of layer plates constitute each part of the pressed plate material, and are continued through the continuous part and bent at the continuous part. The number of stacked layers of either the large end portion or the small end portion of the stacked body is larger than the number of stacked layers in the central portion of the stacked body between the large end portion and the small end portion. Thus, the thickness of the portion where the number of stacked layers is increased is made thicker than the thickness of the central portion of the stacked body.

The connecting rod assembly having this configuration is used as drive transmission means for the engine as described above. In this case, the thickness, that is, the number of stacked layers is set so that the central portion of the stacked body can pass through the interval between the balance weights. Further, among the large end portion and the small end portion of the laminate, the number of laminates with the larger stress applied is made larger than the number of laminates in the central portion of the laminate between the large end portion and the small end portion. The thickness can be made thicker than the thickness of the central portion of the laminate. As a result, in the larger end portion and the smaller end portion where the stress to be applied is larger, the amount of protrusion on both sides of the laminated body of the annular component press-fitted into the fitting hole is reduced, and the annular component The drum-like deformation is prevented, and as a result, the stress applied to the annular part during engine operation is dispersed in the longitudinal direction of the annular part as described above, and due to the concentration of stress in the central part as described above. Damage can be made difficult to occur.
Also in this case, the plurality of layer plates constituting the laminate constitute each part of the pressed plate material, and continue to each other through the continuous part and bend at the continuous part. Therefore, the cost of the connecting rod assembly can be reduced as described above.

In these first and second inventions, the annular part may be an outer ring of a shell type bearing. Further, an annular part may be a solid circular pipe, and needle rollers with a cage may be disposed in the solid circular pipe, and the annular part may be a dry metal that serves as a sliding bearing.
By forming the annular part with a bearing part as in each of these examples, it becomes unnecessary to provide the annular part separately from the bearing. For this reason, it can be set as a connecting rod assembly with a small number of parts and a lightweight bearing.

  A connecting rod assembly according to a first aspect of the present invention is a laminated body formed by laminating a plurality of plate-shaped layer boards, and a pair of press-fitted into fitting holes in a large end portion and a small end portion provided in the laminated body. In the connecting rod assembly having the annular part, the plurality of layer plates constitute each part of the pressed plate material, and are continued through the continuous part and bent at the continuous part. The number of layers of the large end portion and the small end portion of the laminate is larger than the number of layers in the center of the laminate between the large end portion and the small end portion, When the thickness of the large end portion and the small end portion is thicker than the thickness of the central portion of the laminate, when used as a means for converting and transmitting the reciprocating motion of the piston of the engine to the axial rotational motion of the crankshaft, Balance way The central part of the stack also passes through the narrow gap between the cylinders, and smooth drive transmission movements are made. Also, deformation or breakage of the annular parts that are fitted and connected to the crankpins and piston pins hardly occurs, and it is There is no hindrance. Moreover, the processing cost of a layer board and a laminated body can be suppressed, and a low-cost connecting rod assembly can be provided.

  A connecting rod assembly according to a second aspect of the present invention is a laminated body formed by laminating a plurality of plate-shaped layer plates, and a pair of press-fitted into fitting holes in a large end portion and a small end portion provided in the laminated body. In the connecting rod assembly having the annular part, the plurality of layer plates constitute each part of the pressed plate material, and are continued through the continuous part and bent at the continuous part. The number of stacked layers of either the large end portion or the small end portion of the stacked body is larger than the number of stacked layers in the central portion of the stacked body between the large end portion and the small end portion. As a result, the thickness of the portion where the number of stacked layers is increased is made thicker than the thickness of the central portion of the stacked body. By increasing the thickness of the portion where the applied stress is applied and the stress to be applied is increased, it is possible to make it difficult to cause deformation of the annular part press-fitted into the fitting hole of this portion. In addition, the processing cost of the laminated body can be suppressed, and the cost of the connecting rod assembly can be reduced.

  An embodiment of the connecting rod assembly of the first invention will be described with reference to FIGS. This connecting rod assembly 1 is press-fitted into a laminated body 2 formed by laminating a plurality of press-processed layer plates, and fitting holes 2aa and 2ba in a large end portion 2a and a small end portion 2b of the laminated body 2. It consists of a pair of annular parts 3 and 4. The plurality of layer plates include two layer plates 2A and 2B that form an overall shape across the large end portion 2a and the small end portion 2b via the central portion (that is, the rod portion) 2c, and the laminated layer plates 2A, 2B includes layer plates 2J and 2K stacked on both front and back surfaces of the portion corresponding to the large end portion 2a, and layer plates 2L and 2M stacked on both front and back surfaces of the portion corresponding to the small end portion 2b. That is, the laminated body 2 has a large end portion 2a, a small end portion 2b, and a central portion 2c, and the number of laminated layer plates is four, that is, the four laminated layer plates 2A, 2B, 2J, and 2K in the large end portion 2a. In the small end portion 2b, four layer plates 2A, 2B, 2L, and 2M are stacked, and in the central portion 2c, two layer plates 2A and 2B are stacked, and the thickness of the large end portion 2a and the small end portion 2b is set to the central portion 2c. It is thicker than the wall thickness. The lamination of these layer plates 2A, 2B, 2J, 2K, 2L, and 2M will be described later. The integration is performed by press-fitting the annular parts 3 and 4 into the respective fitting holes 2aa and 2ba, and each layer. The plates may be fixed by welding (for example, laser welding) or the like.

  As shown in FIG. 2, the layer plates 2A, 2B, 2J, 2K, 2L, and 2M constitute each part of a single plate material 20 that has been press-punched. 2A, 2B, 2J, 2K, 2L, and 2M are connected to each other through a continuous portion 20a as illustrated. As described above, the overall shape of the layer plates 2A and 2B extends across the large end portion 2a and the small end portion 2b via the rod portion 2c in the laminate 2, but the layer plates 2J, 2K, 2L, 2M has a shape corresponding to the large end portion 2a and the small end portion 2b, that is, a shape having no portion corresponding to the rod portion 2c. In addition, circular holes 2Aa, 2Ba, 2Ja, 2Ka, 2Ab, 2Bb, 2Lb, and 2Mb are formed in portions corresponding to the large end portion 2a and the small end portion 2b of the respective layer plates 2A, 2B, 2J, 2K, 2L, and 2M. Is formed. And in one plate material 20 subjected to press punching, the layer plates 2A and 2B are in a state of being connected in parallel through the continuous portion 20a in the portions corresponding to the large end portion 2a and the small end portion 2b, On these outsides, four layers 2J, 2K, 2L, and 2M are connected to the portions corresponding to the large end portion 2a and the small end portion 2b through the continuous portion 20a.

Next, referring to FIGS. 3A, 3B, and 3C, the layer plates 2A, 2B, 2J, 2K, 2L, and 2M constituting the plate member 20 are stacked by being bent at each continuous portion 20a. The procedure for forming the laminate 2 will be described.
In FIGS. 2 and 3, for convenience, the portions corresponding to the large end portion 2a and the small end portion 2b in each layer plate are shown in the same shape and size, but in actuality, as shown in FIG. It is a relationship. The same applies to FIGS. 6 to 8 showing other embodiments. On the contrary, in each of the above embodiments, the large end portion 2a and the small end portion 2b may have the same shape and size. The “large end portion 2a” and the “small end portion 2b” do not necessarily have to be in a large and small size relationship, the crankshaft side portion being the “large end portion 2a” and the piston side portion being “ Say “small end 2b”.
First, as shown in FIG. 3A, the layer plates 2J, 2K, 2L, and 2M are bent at each continuous portion 20a and overlapped on the same surface side (the front surface side or the back surface side) of the layer plates 2A and 2B. . In this state, the layer plates 2J and 2L correspond to the portions corresponding to the large end portion 2a and the small end portion 2b of the layer plate 2A, and the layer plates 2K and 2M correspond to the large end portion 2a and the small end portion 2b of the layer plate 2B. It matches each part to be. The circular hole 2Ja matches the circular hole 2Aa, the circular hole 2Ka matches the circular hole 2Ba, the circular hole 2Lb matches the circular hole 2Ab, and the circular hole 2Mb matches the circular hole 2Bb. Further, the layer plates 2A and 2B are bent at the back surface side (or the same surface side) of the continuous portion 20a, that is, the side where the layer plates 2J, 2K, 2L, and 2M are not stacked, and FIG. A laminate 2 as shown in C) is obtained. The laminate 2 has a large end portion 2a, a small end portion 2b, and a central portion 2c, and the number of laminated layer plates is four, that is, the layer plates 2A, 2B, 2J, and 2K are stacked in the large end portion 2a. At the end portion 2b, four layers of the layer plates 2A, 2B, 2L, 2M are stacked, and at the center portion 2c, two layers of the layer plates 2A, 2B are stacked. As a result, the thickness of the large end portion 2a and the small end portion 2b is the center. It is made thicker than the thickness of the part 2c. In addition, the circular holes 2Aa, 2Ba, 2Ja, 2Ka and the circular holes 2Ab, 2Bb, 2Lb, 2Mb are concentrically matched to constitute the fitting hole 2aa of the large end portion 2a and the fitting hole 2ba of the small end portion 2b. To do. The connecting rod assembly 1 as shown in FIG. 1 is obtained by press-fitting the annular parts 3 and 4 into the fitting holes 2aa and 2ba. If necessary, each layer plate is fixed by welding or the like.

  As the annular parts 3 and 4, three kinds as shown in FIGS. 4A, 4B and 4C are desirably used. FIG. 4 shows the small end portion 2b, and the large end portion 1a is not shown in the figure, but it is assumed that the same corresponding ones are press-fitted. An annular part 4 in FIG. 4 (A) shows an example of an outer ring 4A of a shell type bearing, and the annular part 4 in FIG. 4 (B) is a solid circular pipe 4B and is held in this solid circular pipe 4B. An example in which a needle roller 6 with a vessel is arranged is shown, and an annular part 4 in FIG. 4C is an example of a dry metal 4C serving as a sliding bearing. The outer ring 4A of the shell type bearing shown in FIG. 4A is provided with a plurality of rollers 5 that roll along a rolling surface that is an inner diameter surface, and each roller 5 is attached to a ring-shaped cage 5a. Is retained. The outer ring 4A of the shell type bearing is made of a press-formed product of a steel plate or the like, and has flanges 4Aa on both sides. The needle rollers 6 in the solid circular tube 4B shown in FIG. 4B are assembled so as not to be separated from each other in combination with the cage 6a. The inner surface of the dry metal 4C shown in FIG. 4C has a slipperiness, and itself becomes a slide bearing. These annular parts 4A, 4B, and 4C are all press-fitted into a fitting hole 2ba formed in a small end portion 2b of a laminated body formed by laminating four laminated parts 2A, 2B, 2L, and 2M. In this press-fitted state, the portions protruding on both sides of the laminate 2 are smaller than in the conventional example of FIG.

  FIG. 5 conceptually shows a state in which the laminated connecting rod assembly 1 configured as described above is assembled to the engine. The large end portion 2a of the laminated connecting rod assembly 1 is fitted and coupled to the crankpin 51 of the crank body 50 via an annular part 3 so as to be relatively rotatable about its axis, and the small end part 2b is an annular part. 4 is fitted and coupled to the piston pin 61 of the piston 60 so as to be relatively rotatable about its axis. The crankpin 51 is fixed in an eccentric state between the pair of arms 53 with respect to the crankshaft 52, and a balance weight 53a is formed at a portion of the both arms 53 opposite to the crankpin 51.

  The pair of balance weights 53a is formed so that the distance d between the opposed portions is small due to its configuration. Therefore, as shown in the figure, the central portion 2c of the laminated body 2 is composed of only two laminated components 2A and 2B, and the thickness thereof is smaller than the distance d. As a result, when the vertical reciprocating motion of the piston 60 is converted and transmitted to the axial rotational motion of the crankshaft 52 via the crankpin 51 and the pair of arms 53, the laminate central portion 2c of the connecting rod assembly 1 receives the balance weight 53a. This conversion drive transmission is made smooth by passing between them without interference. On the other hand, in the large end portion 2a and the small end portion 2b, four layer plates 2A, 2B, 2J, 2K and 2A, 2B, 2L, 2M are laminated and integrated, and the thickness of this portion is the thickness of the central portion 2c. It is thicker than the thickness. Therefore, the protruding parts on both sides of the laminate 2 of the annular parts 3 and 4 press-fitted into the fitting holes 2aa and 2ba of the large end part 2a and the small end part 2b are small, and the annular parts 3 and 4 and the laminate 2 are small. The fitting width becomes larger. By increasing the fitting width, the drum-shaped deformation as shown in FIG. 10 (B) is less likely to occur, and even if the operation of the engine is continued, the stress applied to the annular parts 3 and 4 is increased in the longitudinal direction. It becomes difficult to cause breakage due to concentration of stress on the central part in the longitudinal direction of the annular parts 3 and 4, and thus there is no concern that the operation of the engine will be hindered.

  6 to 8 show a modification of the layer plate applied to the connecting rod assembly of the present invention, and correspond to FIG. A plate member 20A shown in FIG. 6 includes three layer plates 2A, 2B, and 2C that are connected in parallel via a continuous portion 20Aa, and the outer side of the layer plates 2A and 2C and its large end portion 2a and small end. It consists of four layer boards 2J, 2K, 2L, and 2M connected to the part corresponding to the part 2b via the continuous part 20Aa. Similarly to the above, the layer plates 2A, 2B, and 2C are shaped so that the overall shape extends over the large end portion 2a and the small end portion 2b via the rod portion 2c in the laminate 2, and the layer plates 2J, 2K, and 2L , 2M have a shape corresponding to the large end portion 2a and the small end portion 2b, that is, a shape having no portion corresponding to the rod portion 2c. In these layer plates 2A, 2B, 2C, 2J, 2K, 2L, and 2M, circular holes 2Aa, 2Ab, 2Ba, 2Bb, 2Ca, 2Cb, 2Ja, 2Ka, 2Lb, and 2Mb are formed as described above. Yes.

  In order to form a laminate using such a plate material 20A, first, the layer plates 2J and 2L are bent at the continuous portion 20Aa and overlapped on the surface side (or the back side) of the layer plate 2A. Further, the layer plates 2K and 2M are bent at the continuous portion 20Aa and stacked on the back side (or the same surface side) of the layer plate 2C. Next, the layer plate 2A is bent at the continuous portion 20Aa, and is folded to the back side (or the same surface side) of the layer plate 2B, and the layer plate 2C is bent at the continuous portion 20Aa, and the surface side of the layer plate 2B is (or On the same back side). Although not shown, the laminate formed in this manner has a large end portion, a small end portion, and a central portion as described above, and the number of layer plates laminated is the layer plates 2A and 2B at the large end portion. , 2C, 2J, 2K, 5 layers of layer plates 2A, 2B, 2C, 2L, 2M at the small end, and 3 layers of layer plates 2A, 2B, 2C at the center. The thickness of the large end portion and the small end portion is made thicker than the thickness of the central portion. In addition, the circular holes 2Aa, 2Ba, 2Ca, 2Ja, 2Ka and the circular holes 2Ab, 2Bb, 2Cb, 2Lb, 2Mb formed concentrically on the respective layer plates are respectively congruent, and the large-end fitting hole and the small-end portion The fitting hole is configured. By inserting an annular part similar to the above into these fitting holes, a connecting rod assembly as shown in FIG. Also in this case, if necessary, each layer plate may be fixed by welding or the like.

  The plate member 20B shown in FIG. 7 is configured such that layer plates 2N, 2P, 2Q, and 2R having the same shape are continued through the continuous portion 20Ba on the outer side of the layer plates 2J, 2K, 2L, and 2M in the plate member 20 shown in FIG. It is connected. Also in this case, a laminated body in which these respective layer plates are laminated is formed by bending at the continuous portion 20Ba in the same manner as described above. Although not shown, the formed laminate has a large end portion, a small end portion, and a central portion in the same manner as described above, and the number of laminated layer plates is the layer plates 2A, 2B, 2J, and 2K at the large end portion. , 2N, 2P, 6 layers of layer plates 2A, 2B, 2L, 2M, 2Q, 2R at the small end portion, 2 layers of layer plates 2A, 2B at the center, resulting in a large end The thickness of the portion and the small end portion is made thicker than the thickness of the central portion. In addition, the circular holes 2Aa, 2Ba, 2Ja, 2Ka, 2Na, 2Pa and the circular holes 2Ab, 2Bb, 2Lb, 2Mb, 2Qb, 2Rb formed in each layer plate are respectively concentrically matched, and the large-end fitting holes And the fitting hole of a small end part is comprised. By inserting an annular part similar to the above into these fitting holes, a connecting rod assembly as shown in FIG. Also in this case, if necessary, each layer plate may be fixed by welding or the like.

  A plate member 20C shown in FIG. 8 has a shape obtained by removing the layer plate 2B from the plate member 20 shown in FIG. That is, the same four layer plates 2J, 2K, 2L, and 2M as described above are connected to both sides of the portion corresponding to the large end portion and the small end portion of the layer plate 2A through the continuous portion 20Ca. Also in this case, bending is performed at the continuous portion 20Ca, and the layer plates 2J, 2K, 2L, and 2M are stacked on the front and back of the layer plate 2A to obtain a laminate as shown in FIG. This laminated body also has a large end portion, a small end portion, and a central portion, and the number of laminated layer plates is three layers of layer plates 2A, 2J, and 2K at the large end portion, and the layer plate 2A at the small end portion. 3L of 2L and 2M are overlapped, and only the layer plate 2A is formed in the central portion. As a result, the thickness of the large end portion and the small end portion is made thicker than the thickness of the central portion. Also, the circular holes 2Aa, 2Ja, 2Ka and the circular holes 2Ab, 2Lb, 2Mb provided in each layer plate are concentrically matched to constitute a large end fitting hole and a small end fitting hole. By inserting an annular part similar to the above into these fitting holes, a connecting rod assembly as shown in FIG. Also in this case, if necessary, each layer plate may be fixed by welding or the like.

  Each of the plate materials shown above is obtained by punching and pressing a steel plate, and a laminated body is obtained by bending each layer plate constituting the plate material at a continuous portion connecting them, so that the manufacturing cost of the connecting rod assembly can be kept low. Can do. Further, the connecting rod assemblies obtained by the various plate materials described above have different thickness ratios between the large end portion, the small end portion, and the central portion. These are the engine specifications shown in FIG. 5, that is, the distance between the balance weights 53a. It is appropriately selected and adopted according to the ratio between d and the allowable fitting width of the annular parts 3 and 4 in the crank pin 51 and the piston pin 61.

  9A, 9B, 9C and 9D show an embodiment of the second invention. In this embodiment, the number of stacked layers of either the large end portion 2a or the small end portion 2b of the stacked body 2 is set to be larger than the stacked number of the stacked body central portion 2c between the large end portion 2a and the small end portion 2b. The thickness of the portion where the number of stacked layers is increased is made thicker than the thickness of the central portion 2c of the stacked body. In the laminated body 2 in the connecting rod assembly 1 shown in FIGS. 9A and 9B, the large end portion 2a is a four-layer stack of layer plates 2A, 2B, 2J, and 2K, and the small end portion 2b and the central portion 2c are layered 2A. , 2B, and the thickness of the large end portion 2a is larger than the thickness of the small end portion 2b and the central portion 2c. Further, in the laminated body 2 in the connecting rod assembly 1 shown in FIGS. 9C and 9D, the small end portion 2b is a four-layer stack of layer plates 2A, 2B, 2L, and 2M, and the large end portion 2a and the central portion 2c are layered. Two plates 2A and 2B are overlapped, and the thickness of the small end portion 2b is larger than the thickness of the large end portion 2a and the central portion 2c.

  Also in the connecting rod assembly 1 of this embodiment, one of the annular parts 3 and 4 shown in FIG. 4 is press-fitted into the fitting holes 2aa and 2ba of the large end portion 2a and the small end portion 2b. Then, the annular parts 3 and 4 are fitted and coupled to the crank pin 51 and the piston pin 61 of the engine as shown in FIG. 5, and the reciprocating motion of the piston 60 is converted and transmitted to the axial rotational motion of the crankshaft 52. Used as Therefore, at the time of this conversion drive transmission, the thin laminated body central portion 2c of the connecting rod assembly 1 passes between them without interfering with the balance weight 53a, and this conversion drive transmission is made smoothly. Further, since either one of the large end portion 2a and the small end portion 2b is thicker than the laminate central portion 2c, the laminate 2 of the annular parts 3 or 4 press-fitted into the thickened portion. Even if the engine continues, the stress applied to the annular part 3 or 4 is dispersed in the longitudinal direction of the annular part 3 or 4. The drum-like deformation and breakage due to the concentration of stress on the central portion in the longitudinal direction of the engine become difficult to occur, and thus there is no concern that the operation of the engine will be hindered.

  Also in this embodiment, the plurality of layer plates 2A, 2B, 2J, 2K (2L, 2M) constitute one pressed plate material, and continue to each other via a continuous portion. Lamination is performed by bending at the continuous portion, whereby the laminate 2 is obtained. Therefore, the manufacturing cost of the connecting rod assembly 1 can be kept low. Further, the setting of which thickness of the large end portion 2a and the small end portion 2b is to be thickened and the setting of the thickness ratio are the stresses applied to the crank side and the piston side in the engine as shown in FIG. It is made according to the size and the ratio of the distance d of the balance weight 53a and the allowable fitting width of the annular parts 3 and 4 in the crank pin 51 and the piston pin 61.

  In each of the above-described embodiments, the shape of the layer plate laminated on the large end portion and the small end portion of the laminate is provided with a projecting piece portion extending from the annular peripheral edge portion toward the center portion side. An annular ring concentric with the fitting hole may be used.

(A), (B) is the front view and side view of a connecting rod assembly which concern on one Embodiment of 1st invention, respectively. It is a top view which shows notionally the board | plate material which comprises the laminated body of the same connecting rod assembly. (A) is a top view which shows notionally the process of forming a laminated body using the board material, (B) is a top view of the laminated body formed using the board material, (C) is the side view It is. (A), (B), (C) is a partial expanded sectional view of the same connecting rod assembly, and shows various modifications thereof. It is a conceptual sectional view showing an example of use of the connecting rod assembly. It is a top view which shows notionally the modification of the board | plate material which comprises the laminated body of the same connecting rod assembly. It is a top view which shows notionally another modification of the board material. It is a top view which shows notionally another modification of the board | plate material notionally. (A), (B) is the front view and side view of the connecting rod assembly which concern on one Embodiment of 2nd invention, respectively, (C), (D) is the front view of another embodiment of the same connecting rod assembly, respectively. And a side view. (A) is a conceptual sectional view showing a usage example of a conventional connecting rod assembly, and (B) is a partially enlarged view showing a phenomenon that occurs in this usage state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Connecting rod assembly 2 ... Laminated body 2a ... Large end part 2aa ... Fitting hole 2b ... Small end part 2ba ... Fitting hole 2c ... Laminated body center part 2A, 2B, 2J, 2K, 2L, 2M ... Layer board 20 ... Plate material 20a ... continuous part 3, 4 ... annular part 4A ... outer ring of shell type bearing (annular part)
4B ... Solid pipe (annular part)
4C ... Dry metal (annular parts)
5 ... Roller 6 ... Needle roller with cage

Claims (5)

In a connecting rod assembly having a pair of annular components press-fitted into fitting holes in a large end portion and a small end portion provided in the laminated body, and a laminated body formed by laminating a plurality of plate-like layer plates ,
The plurality of laminar plates constitute each part of a pressed plate material, which is continued through a continuous part and laminated by being bent at this continuous part,
The large end portion and the small end portion are stacked by increasing the number of the large end portion and the small end portion of the laminate to be larger than the number of stacked layers in the central portion of the laminate between the large end portion and the small end portion. The connecting rod assembly is characterized in that the thickness of the connecting rod is thicker than the thickness of the central portion of the laminate. In a connecting rod assembly having a pair of annular components press-fitted into fitting holes in a large end portion and a small end portion provided in the laminated body, and a laminated body formed by laminating a plurality of plate-like layer plates ,
The plurality of laminar plates constitute each part of a pressed plate material, which is continued through a continuous part and laminated by being bent at this continuous part,
By increasing the number of stacked layers of either the large end portion or the small end portion of the stacked body more than the number of stacked layers in the center of the stacked body between the large end portion and the small end portion, A connecting rod assembly characterized in that the thickness of the increased portion is made thicker than the thickness of the central portion of the laminate.   3. The connecting rod assembly according to claim 1, wherein the annular part is an outer ring of a shell type bearing.   3. The connecting rod assembly according to claim 1, wherein the annular part is a solid circular pipe, and needle rollers with a cage are arranged in the solid circular pipe.   3. The connecting rod assembly according to claim 1 or 2, wherein the annular part is a dry metal serving as a sliding bearing.

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