JP2008240976A - Laminated connecting rod assembly and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated connecting rod capable of elongating the service life. <P>SOLUTION: The laminated connecting rod 21 is formed by laminating a plurality of sheets of plate shaped connecting rod parts 26a and 26b including a large end part 23, a small end part 22, and a connecting part 24 connecting the large end part 23 and the small end part 22. Thicknesses L<SB>1</SB>and L<SB>3</SB>of the large end part 23 and the small end part 22 of the laminated connecting rod 21 in a thickness direction are larger than a thickness L<SB>2</SB>of the connecting part 24 in the thickness direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a laminated connecting rod and a manufacturing method thereof, and more particularly to a laminated connecting rod in which a bearing is press-fitted into through holes provided at a large end portion and a small end portion and a manufacturing method thereof.

  As a component member of a general-purpose engine, there is a connecting rod (connecting rod) that connects a crankshaft to a large end and a piston pin to a small end, and transmits a linear reciprocating motion of the piston to the crankshaft to convert it into a rotational motion. The connecting rod includes a large end portion provided with a through hole for connecting the crankshaft, a small end portion provided with a through hole for connecting the piston pin, and a connecting portion for connecting the large end portion and the small end portion. .

  The connecting rod described above includes a laminated connecting rod formed by laminating a plurality of plate-like connecting rod components each having a large end portion, a small end portion, and a connecting portion. In the laminated connecting rod, each connecting rod component can be easily manufactured by press molding or the like. Therefore, it can be manufactured at a lower cost than an integrated forged product or a turned product.

Such a laminated connecting rod is disclosed in, for example, Japanese Patent Application Laid-Open No. 2003-156028 (Patent Document 1).
JP 2003-156028 A

  The laminated connecting rod described above is used as a constituent member of a general-purpose engine. FIG. 15 is a schematic view showing a part of a conventional general-purpose engine. FIG. 16 is an enlarged cross-sectional view of a portion indicated by XVI in the general-purpose engine shown in FIG.

  Referring to FIGS. 15 and 16, general-purpose engine 101 includes a piston 102, a crankshaft 103, and a laminated connecting rod 104. The laminated connecting rod 104 is formed by laminating plate-like connecting rod parts 116a and 116b in the thickness direction. Piston pin 106a and crank pin 106b are coupled to small end portion 118 and large end portion 117 of laminated connecting rod 104 via bearings 111a and 111b, respectively. The bearing 111b includes a raceway ring 112 having a raceway surface 115 on the inner diameter side, a roller 113 that rolls on the raceway surface 115, and a cage 114 that holds the roller 113 (see FIG. 16).

  The crankshaft 103 includes a crankpin 106b and a pair of crank webs 107a and 107b. The crank webs 107a and 107b include attachment portions 108a and 108b for attaching the crank pins 106b, balance weights 109a and 109b having a predetermined weight, and journals 110a and 110b extending in the axial direction.

  Here, if the thickness of the laminated connecting rod 104 in the plate thickness direction is large, the connecting portion 119 of the laminated connecting rod 104 and the balance weights 109a and 109b interfere with each other when the general-purpose engine 101 is operated. Therefore, the thickness of the laminated connecting rod 104 in the thickness direction is regulated by the gap between the balance weights 109a and 109b.

  On the other hand, the large end portion 117 and the small end portion 118 need to have a certain press-fitting width in the plate thickness direction in order to press-fit the bearings 111a and 111b into the through holes. However, as described above, since the thickness of the laminated connecting rod 104 in the thickness direction is restricted, the press-fit width may not be ensured. In particular, when the gap between the balance weights 109a and 109b becomes narrow, the thickness of the laminated connecting rod 104 in the thickness direction is greatly limited. Then, as shown in FIG. 16, the press-fitting width of the bearing 111b is insufficient, and the bus bar shape of the race 112 included in the bearing 111b is deformed with the center in the plate thickness direction as a convex shape. Note that, from the viewpoint of easy understanding, the deformation of the race 112 in FIG. 16 is exaggerated. Such a laminated connecting rod 104 cannot have a long life.

  An object of the present invention is to provide a laminated connecting rod capable of extending the life.

  Another object of the present invention is to provide a method for producing a laminated connecting rod that can easily produce a laminated connecting rod capable of extending the life.

  The laminated connecting rod according to the present invention is formed by laminating a plurality of plate-like connecting rod parts including a large end portion, a small end portion, and a connecting portion that connects the large end portion and the small end portion. Here, the thickness in the thickness direction of the end portion on at least one side of the laminated connecting rod is larger than the thickness in the thickness direction of the connecting portion.

  By comprising in this way, the thickness of the edge part of a lamination | stacking connecting rod can be enlarged, reducing the thickness of the connection part of a lamination | stacking connecting rod in the sheet thickness direction. If it does so, the press-fit width | variety at the time of press-fitting a bearing in the edge part of a lamination | stacking connecting rod can be ensured, avoiding interference with another member in the connection part of a lamination | stacking connecting rod. Therefore, it is possible to prevent deformation or the like of the bearing ring included in the press-fitted bearing, prevent damage due to interference with other members, and extend the life of the laminated connecting rod.

  Preferably, the thickness in the plate thickness direction of both ends of the laminated connecting rod is larger than the thickness of the connecting portion in the plate thickness direction. By doing so, it is possible to secure the press-fitting width when the bearings are press-fitted at both ends of the laminated connecting rod while avoiding interference between the connecting portion of the laminated connecting rod and other members. Therefore, the life of the laminated connecting rod can be further extended.

  More preferably, the end portion includes a plate-like member that is disposed in the plate thickness direction and increases the thickness of the end portion in the plate thickness direction. By carrying out like this, the thickness of the thickness direction of an edge part can be easily enlarged by the plate-shaped member arrange | positioned at the thickness direction of the edge part of a lamination | stacking connecting rod.

  More preferably, the plate member is disposed on both outer sides in the plate thickness direction of the end portion. By carrying out like this, the thickness of the edge part in the plate | board thickness direction can be more appropriately enlarged by the plate-shaped member arrange | positioned at the plate | board thickness direction both ends of the edge part of a lamination | stacking connecting rod.

  In another aspect of the present invention, a method for manufacturing a laminated connecting rod includes laminating a plurality of plate-like connecting rod components including a large end portion, a small end portion, and a connecting portion that connects the large end portion and the small end portion. The thickness of the end portion of at least one side in the plate thickness direction is larger than the thickness of the connecting portion in the plate thickness direction. Here, the manufacturing method of the lamination | stacking connecting rod integrates the connecting rod component shape part which forms a connecting rod part, and the plate-shaped member shape part which forms the plate-shaped member which enlarges the thickness of the edge part in the plate | board thickness direction via a connection part. So that the surface in the plate thickness direction of the connecting rod part shape portion and the surface in the plate thickness direction of the plate member shape portion face each other after the punching step and the punching step. And a bending step of bending the part.

  According to such a method of manufacturing a laminated connecting rod, the end plate is obtained by bending the connecting portion using the integrated connecting rod component shape portion and the plate-like member shape portion that increases the plate thickness of the end portion. A laminated connecting rod in which the thickness in the thickness direction is larger than the thickness in the plate thickness direction of the connecting portion can be manufactured. Therefore, the laminated connecting rod having the above configuration can be manufactured easily and reliably.

  According to this invention, it is possible to increase the thickness in the thickness direction of the end of the laminated connecting rod while reducing the thickness in the thickness direction of the connecting portion of the laminated connecting rod. If it does so, the press-fit width | variety at the time of press-fitting a bearing in the edge part of a lamination | stacking connecting rod can be ensured, avoiding interference with another member in the connection part of a lamination | stacking connecting rod. Therefore, it is possible to prevent deformation or the like of the bearing ring included in the press-fitted bearing, prevent damage due to interference with other members, and extend the life of the laminated connecting rod.

  Further, according to such a method of manufacturing a laminated connecting rod, the end portion is obtained by bending the connecting portion using the integrated connecting rod component shape portion and the plate-like member shape portion that increases the plate thickness of the end portion. A laminated connecting rod in which the thickness in the plate thickness direction is larger than the thickness in the plate thickness direction of the connecting portion can be manufactured. Therefore, the laminated connecting rod having the above configuration can be manufactured easily and reliably.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing a part of a general-purpose engine including a laminated connecting rod according to an embodiment of the present invention. 2 is an enlarged cross-sectional view of a portion indicated by II in FIG. 1 in the general-purpose engine shown in FIG. Referring to FIGS. 1 and 2, the general-purpose engine 11 includes a piston 12, a crankshaft 13, a laminated connecting rod 21, and bearings 31 a and 31 b. The connecting rod assembly 20 includes a laminated connecting rod 21 and bearings 31a and 31b.

  The laminated connecting rod 21 is formed by laminating plate-like connecting rod parts 26a and 26b in the thickness direction. The basic shape of each connecting rod part 26a, 26b is the same. The laminated connecting rod 21 includes a large end portion 23, a small end portion 22, and a connecting portion 24 that connects the large end portion 23 and the small end portion 22.

  Piston pin 14a and crank pin 14b are connected to small end portion 22 and large end portion 23 of laminated connecting rod 21 via bearings 31a and 31b, respectively. The piston pin 14a and the crank pin 14b are rotatably supported by the bearings 31a and 31b. The bearing 31b includes a bearing ring 32b having a raceway surface 35b on the inner diameter side, a roller 33b that is disposed on the inner diameter side of the raceway ring 32b and rolls on the raceway surface 35b, and a cage 34b that holds the roller 33b. (See FIG. 2). Since the bearing 31a has the same configuration as the bearing 31b, the description thereof is omitted.

  The crankshaft 13 includes a crank pin 14b that is rotatably supported by a bearing 31b, and a pair of crank webs 15a and 15b. The crank webs 15a and 15b include attachment portions 16a and 16b for attaching the crank pin 14b, balance weights 17a and 17b for smooth rotation of the crankshaft 13, and journals 18a and 18b extending in the direction of the rotation axis of the crankshaft 13. With. The crank webs 15a and 15b rotate around a rotation center axis 19 indicated by a one-dot chain line in FIG. The balance weights 17a and 17b have a predetermined weight. The balance weights 17a and 17b have a shape that protrudes to the opposite side in order to secure a predetermined weight. The balance weights 17a and 17b are provided at positions facing the attachment portions 16a and 16b by 180 degrees with the rotation center shaft 19 as the center.

Here, the large end portion 23 includes plate-like members 27 a and 27 b that are arranged on both outer sides in the plate thickness direction and increase the thickness of the large end portion 23 in the plate thickness direction. A thickness L _{1 in} the thickness direction of the large end portion 23 of the laminated connecting rod 21 is configured to be larger than a thickness L _{2 in} the thickness direction of the connecting portion 24 of the laminated connecting rod 21. Similar to the large end 23, the small end 22 includes plate-like members 28 a and 28 b that are arranged on both outer sides in the plate thickness direction and increase the thickness of the small end 22 in the plate thickness direction. The thickness L _{3 in} the thickness direction of the small end portion 22 of the laminated connecting rod 21 is also configured to be larger than the thickness L _{2 in} the thickness direction of the connecting portion 24 of the laminated connecting rod 21.

  Each of the plate-like members 27a and 27b is provided with a through hole penetrating in the plate thickness direction. The bearing 31b is press-fitted into through holes provided in the connecting rod parts 26a and 26b and the plate-like members 27a and 27b. Similarly, the plate-like members 28a and 28b are each provided with a through hole penetrating in the plate thickness direction. The bearing 31a is press-fitted into through holes provided in the connecting rod parts 26a and 26b and the plate-like members 28a and 28b.

By configuring in this way, the thickness L ₁ in the thickness direction of the large end portion 23 and the small end portion 22 of the stacked connecting rod 21 while the thickness L ₂ of the connecting portion 24 of the stacked connecting rod 21 is reduced. L ₃ can be increased. Then, while avoiding interference with the balance weights 17a and 17b, which are other members, at the connecting portion 24 of the laminated connecting rod 21, the bearings 31b and 31a are pressed in at the large end 23 and the small end 22 of the laminated connecting rod 21. The press-fitting width can be secured. Therefore, deformation of the race ring 32b included in the press-fit bearings 31b and 31a can be prevented, damage to the balance weights 17a and 17b can be prevented, and the life of the laminated connecting rod 21 can be extended. Can be achieved.

  In this case, it is possible to secure a press-fitting width when the bearings 31b and 31a are press-fitted at both ends of the laminated connecting rod 21, that is, the large end 23 and the small end 22 side. Therefore, the life of the laminated connecting rod 21 can be further extended.

The large end portion 23 and the small end portion 22 are arranged in the plate thickness direction, and plate-like members 27a and 27b that increase the thicknesses L ₁ and L ₃ of the large end portion 23 and the small end portion 22 in the plate thickness direction. 28a and 28b, the thicknesses L ₁ and L ₃ in the plate thickness direction of the large end portion 23 and the small end portion 22 can be easily increased.

Furthermore, since the plate-like members 27a, 27b, 28a, and 28b are respectively disposed on both outer sides in the plate thickness direction of the large end portion 23 and the small end portion 22, the plates of the large end portion 23 and the small end portion 22 are more appropriately used. Thicknesses L ₁ and L ₃ in the thickness direction can be increased.

  The large end portion 23, the small end portion 22 and the plate-like members 27a, 27b, 28a, 28b of the connecting rod parts 26a, 26b have through holes penetrating in the plate thickness direction. 22 and the plate-like members 27a, 27b, 28a, and 28b, the bearings 31b and 31a are press-fitted into the through holes provided to fix the plate-like members 27a, 27b, 28a, and 28b to the large end portion 23 and the small end portion 22. be able to.

  In the above-described embodiment, the bearing 31b press-fitted into the through hole of the large end portion 23 is a solid ring type bearing in which the race ring 32b is an annular type. Thus, as a bearing press-fitted into the through hole of the large end portion 23, a shell-shaped outer ring 32c having a raceway surface 35c on the inner diameter side and including a flange portion, a roller 33c that rolls on the raceway surface 35c, and a roller 33c are provided. You may decide to apply the shell type roller bearing 31c containing the holder | retainer 34c to hold | maintain. Moreover, as a bearing press-fitted into the through hole of the large end portion 23, a dry metal bearing 31d that includes only a raceway ring 32d having a raceway surface 35d on the inner diameter side and that becomes a slide bearing may be applied. Note that the shell roller bearing 31 c and the dry metal bearing 31 d are applied to both the large end portion 23 and the small end portion 22.

  Next, a method for manufacturing the laminated connecting rod 21 shown in FIGS. 1 and 2 will be described. FIG. 5 is a flowchart showing typical steps in the method for manufacturing the laminated connecting rod 21 according to the embodiment of the present invention.

  1, 2, and 5, first, a plate-shaped member that forms a connecting rod component-shaped portion that forms a connecting rod component and a plate-shaped member that increases the thickness of the large end portion and the small end portion in the plate thickness direction. A plate-shaped material is punched from one side in the plate thickness direction with a punch or the like so as to form a shape portion, and a connecting rod part intermediate is formed (FIG. 5A). FIG. 6 is a view showing a connecting rod part intermediate body. Referring to FIG. 6, connecting rod part intermediate body 41a includes connecting rod part shape part 42a and plate-like member shape parts 43a and 43b. The plate-like member shape portions 43a and 43b are connected at the connection portions 44a and 44b so as to be continuous with the longitudinal direction of the connecting rod component shape portion 42a. That is, the connecting rod part shape part 42a and the plate-like member shape parts 43a and 43b are integrated.

  The connecting rod part shape portion 42a includes a large end portion 45b, a small end portion 45a, and a connecting portion 45c that connects the large end portion 45b and the small end portion 45a. The large end 45b and the small end 45a are formed with through holes 46b and 46a penetrating in the plate thickness direction. The plate-like member shape portion 43b includes a large end portion 47b. The plate-like member shape portion 43a includes a small end portion 47a. Through holes 48b and 48a penetrating in the plate thickness direction are formed in the large end portion 47b and the small end portion 47a. The through holes 46a, 46b, 48a, 48b are formed at the time of punching or the like. The connection portion 44b is provided on the outer peripheral portion of the large end portions 45b and 47b. Moreover, the connection part 44a is provided in the outer peripheral part of the small end parts 45a and 47a.

  Next, after the plate-like material is punched out in this way to obtain the connecting rod part intermediate body 41a, the plate-like member shape portions 43a and 43b are bent (FIG. 5B). In this case, it bends so that it may fold in connection part 44a, 44b. In addition, in order to make this process easy, you may make the connection parts 44a and 44b thin. FIG. 7 is a view showing the connecting rod part intermediate body 41a in this state. FIG. 8 is a cross-sectional view of the connecting rod component intermediate body 41a shown in FIG. 7 cut along a cross section VIII-VIII. Referring to FIGS. 7 and 8, plate-like member shape portions 43a and 43b are arranged such that the surface in the plate thickness direction of connecting rod component shape portion 42a and the surface in the plate thickness direction of plate-like member shape portions 43a and 43b are opposed to each other. Bend like so.

  Thereafter, similarly formed connecting rod component intermediate body 41b and connecting rod component intermediate body 41a are laminated. FIG. 9 is a cross-sectional view showing the connecting rod component intermediate bodies 41a and 41b in this state, and corresponds to FIG. Referring to FIG. 9, the back surfaces 49a and 49b of the connecting rod component intermediate bodies 41a and 41b, that is, the surfaces on the side where the plate-like member-shaped portions 43a and 43b are not bent are aligned, and the connecting rod component intermediate bodies 41a and 41b are combined. Are laminated. In this case, the lamination is performed so that the outer shape and the through hole coincide. Here, the back surfaces 49a and 49b may be joined together.

  In this way, the laminated connecting rod 51 is manufactured. In this way, the connecting rod part intermediate body 41a, in which the connecting rod part shape part 42a and the plate-like member shape parts 43b and 43a that increase the plate thickness of the large end part 45b and the small end part 45a are integrated, is used. , 44b can be used to manufacture the laminated connecting rod 51 in which the thickness of the large end 45b and the small end 45a in the plate thickness direction is larger than the thickness of the connecting portion 45c in the plate thickness direction. Therefore, the laminated connecting rod 51 having the above-described configuration can be manufactured easily and reliably.

  Then, the bearings 50a and 50b are press-fitted into the through holes of the laminated connecting rod 51 (FIG. 5C). In this way, the connecting rod assembly 52 is manufactured. FIG. 10 is a view showing the connecting rod assembly 52 in this case. FIG. 11 is a cross-sectional view of the connecting rod assembly 52 shown in FIG. 10 cut along a cross section XI-XI. Referring to FIGS. 10 and 11, connecting rod assembly 52 includes a laminated connecting rod 51 and bearings 50 a and 50 b press-fitted into the through holes of laminated connecting rod 51.

  The laminated connecting rod 51 and connecting rod assembly 52 are manufactured through the above steps. The connecting rod assembly 52 thus obtained is assembled into a general-purpose engine.

  In the punching step, the plate-like member shape portions 43a and 43b are formed so as to be continuous with the longitudinal direction of the connecting rod component shape portion 42a. However, the present invention is not limited to this, and as shown in FIG. The plate-like member shape parts 63a and 63b may be formed so as to be continuous in the short direction of the connecting rod part shape part 62a included in the body 61, that is, in the direction orthogonal to the longitudinal direction of the connecting rod part shape part 62a. . In this case, the connection parts 64b and 64a are arrange | positioned at the side part of the large end part 65b and the small end part 65a.

  In order to improve the strength of the laminated connecting rod 21 and the like within a range in which interference with the balance weights 17a and 17b as other members can be avoided, a plate-like connecting rod component is interposed between the connecting rod components described above. You may do it. FIG. 13 is a diagram showing a plate-like connecting rod component to be interposed. FIG. 14 is a cross-sectional view of the connecting rod component shown in FIG. 13 cut along a cross section XIV-XIV. The thickness of the laminated connecting rod 51 and the like in the thickness direction and the strength of the laminated connecting rod 51 and the like are adjusted by interposing the plate-like connecting rod component 66 having the shape shown in FIGS. 13 and 14 between the connecting rod component intermediate bodies 41a and 41b. be able to.

  In the above embodiment, the thickness of the large end portion and the small end portion in the plate thickness direction is made larger than the thickness of the connecting portion in the plate thickness direction by the plate-like member. The thickness of the large end portion and the small end portion in the plate thickness direction may be increased by another member. Moreover, it is good also as a structure which makes the thickness of the plate | board thickness direction of either one of a large end part or a small end part larger than the thickness of the connection part in the plate | board thickness direction. In addition, you may decide to comprise a plate-shaped member from the some plate-shaped member further divided | segmented further finely. Furthermore, a plate-like member may be provided only on one side in the plate thickness direction.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The laminated connecting rod and the manufacturing method thereof according to the present invention are effectively used when it is required to easily and reliably produce a laminated connecting rod that requires a long life and such a laminated connecting rod. .

It is the schematic which shows a part of general purpose engine containing the lamination | stacking connecting rod which concerns on one Embodiment of this invention. It is an expanded sectional view of the part shown by II in FIG. 1 among the lamination | stacking connecting rods shown in FIG. It is sectional drawing which shows a part of lamination | stacking connecting rod at the time of making the press-fit bearing into a shell type roller bearing. It is sectional drawing which shows a part of lamination | stacking connecting rod at the time of making the press-fit bearing a dry metal bearing. It is a flowchart which shows a typical process among the manufacturing methods of the lamination | stacking connecting rod which concerns on one Embodiment of this invention. It is a figure which shows a connecting rod component intermediate body. It is a figure which shows the state which bent the plate-shaped member shape part among the connecting rod component intermediate bodies shown in FIG. It is sectional drawing at the time of cut | disconnecting the connecting rod component intermediate body shown in FIG. 7 in the cross section VIII-VIII. It is a side view which shows the state which match | combined the back surface of the connecting rod component intermediate body shown in FIG. It is a figure which shows the connecting rod assembly which press-fitted the bearing to the through-hole of the lamination | stacking connecting rod. It is sectional drawing at the time of cut | disconnecting the connecting rod assembly shown in FIG. 10 by the cross section XI-XI. It is a figure which shows other embodiment of a connecting rod component intermediate body. It is a figure which shows plate-shaped connecting rod components. It is sectional drawing at the time of cut | disconnecting the plate-shaped connecting rod components shown in FIG. 13 in the cross section XIV-XIV. It is the schematic which shows a part of general purpose engine containing the lamination | stacking connecting rod in the past. It is an expanded sectional view of the part shown by XVI in FIG. 15 among the lamination | stacking connecting rods shown in FIG.

Explanation of symbols

  11 General-purpose engine, 12 piston, 13 crankshaft, 14a piston pin, 14b crankpin, 15a, 15b crank web, 16a, 16b mounting part, 17a, 17b balance weight, 18a, 18b journal, 19 rotation center shaft, 20, 52 Connecting rod assembly, 21, 51 Laminated connecting rod, 22, 45a, 47a, 65a Small end portion, 23, 45b, 47b, 65b Large end portion, 24, 45c Connecting portion, 26a, 26b, 66 Connecting rod parts, 27a, 27b, 28a , 28b Plate member, 31a, 31b, 50a, 50b Bearing, 31c Shell type roller bearing, 31d Dry metal bearing, 32b, 32d Race ring, 32c Shell type outer ring, 33b, 33c Roller, 34b, 34c Cage, 35b, 35c, 35d Raceway surface, 41a, 41b, 61 Connecting rod part intermediate, 42a, 62a Connecting rod part shape part, 43a, 43b, 63a, 63b Plate-like member shape part, 44a, 44b, 64a, 64b Connection part, 46a, 46b, 48a, 48b Through hole, 49a, 49b Rear surface.

Claims (5)

A laminated connecting rod formed by laminating a plurality of plate-like connecting rod components including a large end, a small end, and a connecting portion that connects the large end and the small end,
The laminated connecting rod, wherein the thickness of the end portion on at least one side of the laminated connecting rod in the thickness direction is larger than the thickness of the connecting portion in the thickness direction. 2. The laminated connecting rod according to claim 1, wherein a thickness of the both ends of the laminated connecting rod in a plate thickness direction is larger than a thickness of the connecting portion in a plate thickness direction. The laminated connecting rod according to claim 1, wherein the end portion includes a plate-like member that is disposed in the plate thickness direction and increases the thickness of the end portion in the plate thickness direction. The laminated connecting rod according to claim 3, wherein the plate-like member is disposed on both outer sides in the plate thickness direction of the end portion. It is formed by laminating a plurality of plate-shaped connecting rod parts including a large end portion, a small end portion, and a connecting portion that connects the large end portion and the small end portion, and the plate thickness of the end portion on at least one side The thickness in the direction is a method for manufacturing a laminated connecting rod that is larger than the thickness in the plate thickness direction of the connecting portion,
A plate-shaped material so that the connecting rod component-shaped portion forming the connecting rod component and the plate-shaped member forming portion forming the plate-shaped member that increases the thickness of the end portion in the plate thickness direction are integrated via the connecting portion. Punching process to punch,
A bending step of bending the connecting portion so that a surface in the plate thickness direction of the connecting rod part shape portion and a surface in the plate thickness direction of the plate-like member shape portion face each other after the punching step; A method for producing a laminated connecting rod.

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