JP2008249001A - Connecting rod assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting rod assembly in which annular parts press-fitted into a large end portion and a small end portion are not deformed though its structure is simple. <P>SOLUTION: This connecting rod assembly comprises: a stacked body 2 formed by stacking pressed plate-like stacking parts 2A-2F; and the pair of annular parts 3, 4 press-fitted into the fitting holes 2aa, 2ba of the large end portion 2a and the small end portion 2b formed on the stacked body 2. In the connecting rod assembly 1, the stacked number of parts at each of the large end portion 2a and the small end portion 2b of the stacked body 2 is larger than the stacked number of parts at a stacked body center part 2c between the large end portion 2a and the small end portion 2b, and the thickness of each of the large end portion 2a and the small end portion 2b is larger than that of the stacked body center part 2c. <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 rod portions are laminated and fixed integrally have been proposed (for example, Patent Document 1 and Patent Document 2).

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. Further, Patent Document 2 discloses that the divided connecting rod parts are integrally bonded and fixed by press-bonded projections and recesses.
JP 2003-156028 A JP 2004-324760 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. A state where such a laminated connecting rod assembly is assembled to the engine is conceptually shown in FIG. FIG. 8B 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. 8B shows an annular part 105 of the small end portion 103, which is a bearing in which needle rollers 106 with a cage are arranged in this solid circular pipe. 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. 8B. In addition, the annular component 105 (104) may be deformed into a drum shape due to the concentration of stress on the central portion. If such deformation occurs, it will also hinder the operation of the engine.

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

  A connecting rod assembly according to a first aspect of the present invention is press-fitted into a laminated body formed by laminating pressed plate-like laminated parts and fitting holes 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 number of stacked layers of the large end portion and 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. In addition, the thickness of the large end portion and the small end portion is greater than the thickness of the central portion of the laminate.

  The connecting rod assembly having this configuration is used, for example, as a 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 fitted and coupled to the crank pin of the crank through an annular part so as to be relatively rotatable. Thus, it is used as drive transmission means for converting and transmitting the reciprocating motion of the piston into the axial rotational motion of the crankshaft. 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, since the large end portion and the small end portion are not restricted by the distance between the balance weights, the number of laminated layers is increased from the central portion, and the wall thickness of the large end portion and the small end portion is set to the central portion of the laminated body. It can be thicker than the wall thickness. 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. Since the fitting width is widened, it is possible to make it difficult for the drum-shaped deformation of the annular part to occur, and the stress applied to the annular part during engine operation is in the longitudinal direction of the annular part. It is possible to disperse and prevent breakage due to the concentration of stress on the central portion as described above.

  The connecting rod assembly of the second invention is press-fitted into a laminate formed by laminating pressed plate-like laminated parts, and a fitting hole in a large end portion and a small end portion provided in the laminate. In a connecting rod assembly having a pair of annular parts, the number of stacked layers of either the large end portion or the small end portion of the stacked body is set to the number of stacked layers in the central portion of the stacked body between the large end portion and the small end portion. The thickness of the portion where the number of laminated layers is increased is made thicker than the thickness of the central portion of the laminated 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.

  In these first and second inventions, the annular part is an outer ring of a shell-type bearing, or the annular part is a solid circular pipe and needle rollers with cages are arranged in the solid circular pipe. The ring-shaped part may be a dry metal that becomes a sliding bearing. By configuring the annular part in this manner, relative rotation with the crank pin and the piston pin fitted and coupled to the annular part is smoothly performed.

  In these first and second inventions, the outermost laminated component in the laminating direction and the inner laminated component may be provided with coupling protrusions and recesses that mutually couple the laminated components. good. By providing such coupling protrusions and recesses, the outermost laminated component and the inner laminated component are maintained in a strong laminated state. In particular, since the stress applied is large at the portion where the number of laminated parts is increased, the above-mentioned drum-like deformation can be made less likely to occur by maintaining such a strong laminated state.

  The connecting rod assembly according to the first aspect of the present invention is press-fitted into a laminate formed by laminating pressed plate-like laminated parts, and a fitting hole in a large end portion and a small end portion provided in the laminate. In a connecting rod assembly having a pair of annular parts, the number of stacked layers of the large end portion and the small end portion of the stacked body is made 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. When the thickness of the large end portion and the small end portion is made thicker than the thickness of the central portion of the laminate, the reciprocating motion of the engine piston is used as a means for converting and transmitting the shaft shaft rotational motion. In addition, the center portion of the laminate passes through a narrow interval between the balance weights, and smooth drive transmission movement is made, and deformation of the annular part that is fitted and coupled to the crank pin and the piston pin is difficult to occur. Nor interfere with the operation of the engine.

  The connecting rod assembly of the second invention is press-fitted into a laminate formed by laminating pressed plate-like laminated parts, and a fitting hole in a large end portion and a small end portion provided in the laminate. In a connecting rod assembly having a pair of annular parts, the number of stacked layers of either the large end portion or the small end portion of the stacked body is set to the number of stacked layers in the central portion of the stacked body between the large end portion and the small end portion. Since the thickness of the portion where the number of laminated layers is increased is made thicker than the thickness of the central portion of the laminated body, the same as above when used as a drive transmission means from the piston to the crankshaft in the engine In addition to smooth drive transmission movement, the thickness of the part where the stress to be applied is large is increased, so that the annular part press-fitted into the fitting hole of this part is deformed. Flip can be difficult.

  An embodiment of the connecting rod assembly of the first invention will be described with reference to FIG. The connecting rod assembly 1 includes a laminated body 2 formed by laminating a plurality of plate-like laminated parts such as pressed steel plates, and fitting holes 2aa of the large end portion 2a and the small end portion 2b of the laminated body 2. It consists of a pair of annular parts 3 and 4 press-fitted into 2ba. The laminated component includes two laminated components 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 large end portion 2a in the laminated components 2A and 2B. The laminated parts 2C and 2D are laminated on both sides of the same, and the laminated parts 2E and 2F are laminated on both sides of 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 components is set to 4 pieces of the laminated components 2A to 2D in the large end portion 2a, and the small end portion 2b. In the center part 2c, the laminated parts 2A, 2B, 2E, and 2F are overlapped, and in the central part 2c, the laminated parts 2A and 2B are overlapped. It is thick. These laminated parts 2A to 2F are laminated and integrated by press-fitting the annular parts 3 and 4 into the respective fitting holes 2aa and 2ba, but welding (for example, laser welding) between the laminated parts 2A to 2F, etc. It may be fixed by.

  The embodiment shown in FIG. 2 differs from the embodiment of FIG. 1 in the shapes of the laminated components 2C to 2F laminated on the large end portion 2a and the small end portion 2b. That is, the former laminated parts 2C to 2F are annular concentric with the fitting holes 2aa and 2ba, whereas the latter laminated parts 2C to 2F are respectively arranged on the center part 2c side from one peripheral edge of the annular shape. It differs in that it has projecting piece-like extensions 2Ca, 2Da, 2Ea, 2Fa extending in the direction. These are appropriately selected and adopted according to the strength required for the part to be used, but the lengths of the extensions 2Ca, 2Da, 2Ea, 2Fa are set within a range that does not interfere with the balance weight of the crank described later. Is done.

  In each of the embodiments shown in FIGS. 1 and 2, as the annular parts 3 and 4, three types as shown in FIGS. 3A, 3B and 3C are desirably used. FIG. 3 shows the small end portion 2b, and the large end portion 1a is not shown in the figure, but the same corresponding parts are press-fitted. An annular part 4 in FIG. 3 (A) shows an example of an outer ring 4A of a shell type bearing, and the annular part 4 in FIG. 3 (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 example in which the annular part 4 in FIG. 3C is a dry metal 4C serving as a sliding bearing is shown. The outer ring 4A of the shell-type bearing of FIG. 3A has a plurality of rollers 5 that roll along a rolling surface that is an inner diameter surface, and each roller 5 is held by a ring-shaped cage 5a. Yes. 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. Note that a slate-shaped press-molded product having no ridges may be used. The needle rollers 6 in the solid circular tube 4B shown in FIG. 3B 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. 3 (C) has a slipperiness, and itself becomes a slide bearing. These annular parts 4A, 4B, 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, 2E, 2F. In this press-fitted state, portions protruding on both sides of the laminate 2 are smaller than in the conventional example of FIG.

  FIG. 4 conceptually shows a state where the laminated connecting rod assembly 1 configured as described above is assembled to an 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, the four laminated components 2A to 2D and 2A, 2B, 2E, and 2F are integrally laminated, and the thickness of this portion is thicker than the thickness of the central portion 2c. is doing. 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 fit, the drum-shaped deformation as shown in FIG. 8B is less likely to occur, and even when the engine continues, the stress applied to the annular parts 3 and 4 is in the longitudinal direction. It is difficult to cause breakage due to the concentration of stress on the center part in the longitudinal direction of the annular parts 3 and 4, thereby preventing the possibility of hindering the operation of the engine.

  FIGS. 5A and 5B and FIGS. 6A and 6B show another embodiment of the present invention. In this embodiment, a laminated part which is the outermost side in the laminating direction and a laminated part inside the laminated part are provided with coupling protrusions and recesses that mutually couple the laminated parts. 5A and 5B are connected to the connecting rod assembly 1 shown in FIGS. 1A and 1B, and FIGS. 6A and 6B are connected to the connecting rod assembly 1 shown in FIGS. 2A and 2B. It is shown that the coupling means using the concave portions and the concave portions are respectively applied.

  In the connecting rod assembly 1 shown in FIGS. 5A and 5B, projections 7 and recesses 8 having the same size and shape are formed on both surfaces of the outermost laminated parts 2C and 2D of the large end portion 2a. In the laminated parts 2A and 2B, a projection 9 and a recess 10 having the same size and shape at the same position are formed on both surfaces. Also, projections 7 and recesses 8 of the same size and shape are formed on both surfaces of the outermost laminated parts 2D and 2E of the small end portion 2b, and the inner laminated parts 2A and 2B are the same at the same position. A projection 9 and a recess 10 having the same size and shape are formed on each side. The protrusions 7 and 9 and the recesses 8 and 10 of the large end portion 2a and the small end portion 2b are provided at two locations along the longitudinal center line of the connecting rod assembly 1, and are engaged and engaged as shown in the enlarged view. Are combined. Further, the laminated parts 2A and 2B of the laminated body central portion 2c are formed with the same size and shape of the protrusions 11 and the recessed parts 12 at the same positions on both sides, and the laminated parts 2A and 2B have the same meshing fitting relationship. Are connected.

  The protrusions 7, 9, and 11 are formed by a process called a half punching process that is performed to a halfway depth, or a forming process called doweling or the like. These protrusions 7, 9, and 11 are formed such that the back surfaces thereof are recessed portions 8, 10, and 12, and the recessed portion depth is shallower than the plate thickness. These planar shapes are not limited to a circle but may be other shapes. The number and position may be arbitrary. Further, the protrusions 7, 9, and 11 formed on the laminated components 2D, 2F, and 2B may be eliminated, and the recesses 8, 10, and 12 may be formed by through holes.

  In the connecting rod assembly 1 that employs the coupling means using the projections and the recesses, the adjacent components of the laminated components 2A to 2F are coupled to each other due to the meshing and fitting relationship between the projections 7, 9, and 11 and the recesses 8, 10, and 12. In addition, since the laminates are integrated, they can be manufactured easily and inexpensively, and there is no concern that the laminated parts 2A to 2F are firmly connected to each other, and the bending strength and the buckling strength are improved. Is also planned. Further, since the annular parts 3 and 4 are press-fitted into the fitting holes 2aa and 2ba of the large end portion 2a and the small end portion 2b, the press-fitting and the projections 7, 9, 11 and the recesses 8, 10, 12 are Due to the synergistic effect with the coupling of the meshing fitting relation, the mutual coupling of the laminated parts 2A to 2F is made stronger. In this case, the annular parts 3 and 4 can be press-fitted in a state where the laminate 2 is integrally coupled by the projections 7, 9 and 11 and the recesses 8, 10 and 12. The workability of the connecting rod assembly 1 is shortened.

  In the connecting rod assembly 1 shown in FIGS. 6 (A) and 6 (B), the laminated parts 2A and 2B of the laminated body central portion 2c are not formed with the coupling means by the protrusions and the concave portions as described above, and are the most in the lamination direction. In the same manner as above, the annular part of the laminated parts 2C to 2F on the outer side and the hook-like extension parts 2Ca, 2Da, 2Ea, 2Fa extending from the one peripheral edge to the center part 2c side are the same as above. Protrusions 7 and recesses 8 having the same shape are formed, and protrusions 9 and recesses 10 having the same size and shape at the same position are formed on both surfaces of the laminated components 2A and 2B inside thereof. Also in this case, the laminated body 2 in which the laminated components 2A to 2F are firmly laminated and integrated is obtained by the coupling of the protrusions 7 and 9 and the recesses 8 and 10 in the meshing engagement relation.

  7A, 7B, 7C, and 7D 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. 7A and 7B, the large end portion 2a is composed of four laminated components 2A to 2D, and the small end portion 2b and the central portion 2c are two laminated components 2A and 2B. The large end portion 2a is thicker than the small end portion 2b and the central portion 2c. Further, in the laminated body 2 in the connecting rod assembly 1 of FIGS. 7C and 7D, the small end portion 2b is made up of four laminated parts 2A, 2B, 2E, and 2F, and the large end portion 2a and the central portion 2c are laminated. Two parts 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.

  The outer laminated components 2C and 2D in FIGS. 7A and 7B and the outer laminated components 2E and 2F in FIGS. Although it has the bowl-shaped extension part 2Ca, 2Da, 2Ea, 2Fa extended to the center part 2c side from a part, it may be comprised only by an annular | circular shaped part like the example of FIG.

  In the connecting rod assembly 1 of this embodiment, one of the annular parts 3 and 4 shown in FIG. 3 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. 4 so that 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 due to the concentration of the stress in the central portion in the longitudinal direction is less likely to occur, so that there is no concern that the operation of the engine will be hindered.

  In this embodiment, the setting of which of the large end portion 2a and the small end portion 2b is made thicker depends on whether the stress applied to the crank side or the piston side is large. In addition, it is possible to apply the coupling means for the laminated parts by the engagement fitting relationship between the protrusions and the recesses as shown in FIG. 5 or 6 to this embodiment.

  In each of the above embodiments, two laminated parts are stacked in the central portion 2c of the stacked body 2 and four are stacked in the large end portion 2a and the small end portion 2b. However, according to the specifications of the engine to be applied. The number of stacked layers can be changed as appropriate.

(A), (B) is the front view and sectional drawing of the connecting rod assembly concerning one Embodiment of 1st invention, respectively. (A), (B) is the front view and sectional drawing of the modification of the same connecting rod assembly, respectively. (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. (A), (B) is the front view and sectional drawing of the connecting rod assembly concerning further another embodiment of this invention, respectively. (A), (B) is the front view and sectional drawing of the modification of the same connecting rod assembly, respectively. (A), (B) is the front view and sectional drawing 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 FIG. (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-2F ... Laminated parts 3, 4 ... Ring-shaped part 4A ... Shell Type outer ring (annular part)
4B ... Solid pipe (annular part)
4C ... Dry metal (annular parts)
5 ... Roller 6 ... Needle roller with retainer 7, 9 ... Projection 8, 10 ... Recess

Claims (6)

A laminated body formed by laminating pressed plate-like laminated parts, and a connecting rod assembly having a pair of annular parts press-fitted into fitting holes in a large end portion and a small end portion provided in the laminated body In
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, and the meat of the large end portion and the small end portion is increased. A connecting rod assembly having a thickness greater than a thickness of a central portion of the laminate. A laminated body formed by laminating pressed plate-like laminated parts, and a connecting rod assembly having a pair of annular parts press-fitted into fitting holes in a large end portion and a small end portion provided in the laminated body In
The number of stacked one of the large end portion and the small end portion of the laminate is larger than the number of stacked layers in the center of the laminate between the large end portion and the small end portion, and the number of stacked layers is increased. A connecting rod assembly characterized in that the thickness of the portion is greater 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.   6. The coupling protrusion and the concave portion for coupling the two laminated parts to each other in the laminated part that is the outermost side in the laminating direction and the laminated part inside the laminated part according to any one of claims 1 to 5. Connecting rod assembly.

Images