JP2009115277A

JP2009115277A - Laminated connecting rod

Info

Publication number: JP2009115277A
Application number: JP2007291523A
Authority: JP
Inventors: Koichi Machino; 弘一町野
Original assignee: NTN Corp; NTN Toyo Bearing Co Ltd
Current assignee: NTN Corp
Priority date: 2007-11-09
Filing date: 2007-11-09
Publication date: 2009-05-28

Abstract

PROBLEM TO BE SOLVED: To provide a laminated connecting rod, inexpensively manufacturable with a simple structure, by sufficiently securing inner diameter accuracy of a bearing pressed in a large end part and a small end part, by thickening the thickness of the large end part and the small end part. SOLUTION: A laminated part 2A having the large end part 2a, the small end part 2b and a rod part 2c, a laminated part 2B having the large end part 2a and a laminated part 2C having the small end part 2b are laminated. A projection 5 is arranged for projecting in the going in and out direction to the plane direction of the laminated parts by being molded by press working in an edge part being a part of the outer peripheral edge of the large end part 2a and the small end part 2b of the respective laminated parts 2A, 2B and 2C. A cutout 7 is arranged in a position corresponding to the projection 5 in the laminated part 2C unprovided with the projection 5. The mutual adjacent laminated parts are joined by meshing of the projection 5 and a recessed part 6 generated on a reverse surface of this projection 5 or meshing of the projection 5 and the cutout 7. COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、複数の積層部品を積層してなる積層コンロッドに関する。 The present invention relates to a laminated connecting rod formed by laminating a plurality of laminated parts.

エンジンに用いられるコンロッドは、棒鋼材、板材からの鍛造、焼結、または拘束加圧成形等により製造されている。この他に、鋼板のプレス加工により打ち抜き形成される場合がある。コンロッドを、このような鍛造や焼結で製造する場合、工程数が多いため、コスト削減が困難である。一方、簡単かつ安価に製造でき、大端部分や小端部分に取付けられる軸受等の傾きが回避され、曲げ強度と座屈強度の向上も図れるコンロッドとして、板状の積層部品を積層して一体に固定した積層コンロッドが提案されている（例えば、特許文献１および特許文献２）。 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, plate-like laminated parts are laminated and integrated as a connecting rod that can be manufactured easily and inexpensively, avoids tilting of the bearings attached to the large and small ends, and improves bending strength and buckling strength. Laminated connecting rods fixed to the substrate have been proposed (for example, Patent Document 1 and Patent Document 2).

特許文献１に記載の積層コンロッドは、各積層部品間の寸法のばらつきを抑え、製造コストの低減を図るために、同じ素材を連続して打ち抜いた積層部品を１組として積層し、大端部分および小端部分に設けた軸受嵌合穴に軸受の外輪等からなる円環状部品を圧入することにより、各積層部品を互いに一体化させている。 The laminated connecting rod described in Patent Document 1 has a large end portion laminated as a set of laminated parts obtained by continuously punching the same material in order to suppress the dimensional variation between the laminated parts and reduce the manufacturing cost. The laminated parts are integrated with each other by press-fitting an annular part made of an outer ring of the bearing into a bearing fitting hole provided in the small end portion.

また、特許文献２に記載の積層コンロッドは、積層部品のロッド部にプレス加工により成形した結合用の突起と、この突起の裏面に生じた凹部との噛み合い、または突起とは別に形成された貫通穴との噛み合いによって、隣合う積層部品同士を結合させている。 In addition, the laminated connecting rod described in Patent Document 2 is a through-hole formed separately from the engagement between the coupling protrusion formed on the rod portion of the laminated component by press working and the recess formed on the back surface of the protrusion. Adjacent laminated parts are joined together by meshing with the holes.

特開２００３−１５６０２８号公報Japanese Patent Laid-Open No. 2003-156028 特開２００４−３２４７６０号公報JP 2004-324760 A

上記従来の積層コンロッドはいずれも、それぞれ大端部分、小端部分、およびロッド部分を有する同一形状の積層部品を積層したものであり、大端部分も小端部分もロッド部分も同じ枚数の積層部材が積層されており、全体にわたって厚みが均一であった。図７は、このような積層コンロッドをエンジンに組み付けた状態を示す。図例の積層コンロッド１０１は、プレス加工により成形された２枚の積層部品１０２を積層したものである。 Each of the above-mentioned conventional laminated connecting rods is obtained by laminating laminated parts of the same shape each having a large end portion, a small end portion, and a rod portion, and the same number of layers are laminated on the large end portion, the small end portion, and the rod portion. The members were laminated, and the thickness was uniform throughout. FIG. 7 shows a state in which such a laminated connecting rod is assembled to an engine. The laminated connecting rod 101 shown in the figure is obtained by laminating two laminated components 102 formed by press working.

積層コンロッド１０１の大端部分１０１ａおよび小端部分１０１ｂはそれぞれ軸受嵌合穴１０３，１０４を有し、これらに軸受嵌合穴１０３，１０４に軸受、例えばシェル形針状ころ軸受１０５が圧入されて、各軸受１０５により、クランクピン１０６およびピストンピン１０７が支持される。クランクピン１０６は、クランクシャフト１０８と一体回転する一対のアーム１０９間に、クランクシャフト１０８に対し偏心状態で固定されている。各アーム１０９のクランクピン１０６と反対側部分には、バランスウェイト１０９ａが形成されている。ピストンピン１０７は、ピストン１１０に固定されている。 The large end portion 101a and the small end portion 101b of the laminated connecting rod 101 have bearing fitting holes 103 and 104, respectively. Bearings such as shell needle roller bearings 105 are press-fitted into the bearing fitting holes 103 and 104, respectively. The crank pin 106 and the piston pin 107 are supported by the bearings 105. The crankpin 106 is fixed in an eccentric state with respect to the crankshaft 108 between a pair of arms 109 that rotate integrally with the crankshaft 108. A balance weight 109 a is formed on a portion of each arm 109 opposite to the crankpin 106. The piston pin 107 is fixed to the piston 110.

前記一対のバランスウェイト１０９ａは、全体の軸方向寸法が大きくならないように、図のように軸方向内側に膨らみを持たせてあるため、互いの対向部の間隔ａが比較的狭く形成されている。この狭い間隙を積層コンロッド１０１が通過できるようにするには、積層コンロッド１０１のロッド部分１０１ｃの厚みｂを薄くする必要がある。しかし、全体にわたって厚みが均一である積層コンロッド１０１の場合、ロッド部分１０１ｃの厚みｂを薄くすれば、必然的に大端部分１０１ａおよび小端部分１０１ｂの厚みも薄くなる。大端部分１０１ａおよび小端部分１０１ｂの厚みが薄いと、軸受１０５の圧入部の幅が不足し、軸受１０５の内径精度が確保できない場合がある。また、軸受１０５が抜ける恐れある。したがって、ロッド部分１０１ｃの厚みｂをあまり薄くすることができず、設計上の自由度が小さい。 The pair of balance weights 109a are bulged inward in the axial direction as shown in the figure so that the overall axial dimension is not increased, so that the distance a between the opposing portions is relatively narrow. . In order to allow the laminated connecting rod 101 to pass through this narrow gap, it is necessary to reduce the thickness b of the rod portion 101c of the laminated connecting rod 101. However, in the case of the laminated connecting rod 101 having a uniform thickness throughout, if the thickness b of the rod portion 101c is reduced, the thickness of the large end portion 101a and the small end portion 101b is inevitably reduced. If the large end portion 101a and the small end portion 101b are thin, the width of the press-fit portion of the bearing 105 is insufficient, and the inner diameter accuracy of the bearing 105 may not be ensured. Further, the bearing 105 may come off. Therefore, the thickness b of the rod portion 101c cannot be made very thin, and the degree of freedom in design is small.

この発明の目的は、大端部分および小端部分の厚みが厚く、これら大端部分および小端部分に圧入される軸受の内径精度を十分確保することができ、簡単な構造で安価に製造できる積層コンロッドを提供することである。 The object of the present invention is to increase the thickness of the large end portion and the small end portion, sufficiently ensure the accuracy of the inner diameter of the bearing press-fitted into the large end portion and the small end portion, and can be manufactured inexpensively with a simple structure. It is to provide a laminated connecting rod.

この発明の積層コンロッドは、大端部分、小端部分、およびロッド部分を有する積層部品と、大端部分を有する積層部品と、小端部分を有する積層部品とを積層し、各積層部品の大端部分および小端部分の外周縁の一部となる縁部にプレス加工により成形されて積層部品の面方向に対して出入りする方向に突出する突起と、この突起の裏面に生じた凹部との噛み合い、または上記突起とは別に形成された切欠きとの噛み合いによって、隣合う積層部品同士を結合させたことを特徴とする。 The laminated connecting rod of the present invention comprises a laminated component having a large end portion, a small end portion, and a rod portion, a laminated component having a large end portion, and a laminated component having a small end portion. A protrusion formed in the edge part which is a part of the outer peripheral edge of the end part and the small end part and protruding in the direction of entering and exiting the surface direction of the laminated component, and a recess generated on the back surface of the protrusion Adjacent laminated parts are joined together by meshing or meshing with a notch formed separately from the protrusion.

この構成によれば、各積層部品の大端部分および小端部分に成形された突起と、凹部または切欠きとの噛み合いにより、隣合う積層部品同士を結合させるため、一部の積層部品を、大端部分または小端部分だけを有しロッド部分は有しない積層部品とすることができる。それにより、ロッド部の積層部品枚数を少なくして、ロッド部の厚みは薄くしながら、大端部分および小端部分の積層部品枚数を多くして、大端部分および小端部分の厚みを厚くできる。大端部分および小端部分の厚みが厚ければ、これら大端部分および小端部分の軸受嵌合穴に圧入される軸受の圧入部の幅を十分にとって、軸受の内径精度を確保することができる。また、軸受の抜けを防げる。
突起、凹部、および切欠きは、大端部分および小端部分の外周縁の一部となる縁部に設けられるため、大端部分および小端部分の強度低下をほとんど招かない。そのため、大端部分および小端部分の径を必要以上に大きくする必要がない。この積層コンロッドは、複数の積層部品を積層しただけの簡単な構造であり、隣合う積層部品同士を結合する突起、凹部、および切欠きはプレス加工により容易に成形することができるため、安価に製造できる。 According to this configuration, in order to bond adjacent laminated parts to each other by engagement between the projections formed on the large end portion and the small end part of each laminated part and the recesses or notches, some laminated parts are A laminated part having only a large end portion or a small end portion and no rod portion can be obtained. As a result, the number of laminated parts in the rod part is reduced and the thickness of the rod part is reduced, while the number of laminated parts in the large end part and the small end part is increased and the thickness of the large end part and the small end part is increased. it can. If the thickness of the large end portion and the small end portion is large, it is possible to secure the inner diameter accuracy of the bearing by sufficiently securing the width of the press-fitting portion of the bearing that is press-fitted into the bearing fitting hole of the large end portion and the small end portion. it can. Also, the bearing can be prevented from coming off.
Since the protrusions, the recesses, and the notches are provided at the edge that is a part of the outer peripheral edge of the large end portion and the small end portion, the strength of the large end portion and the small end portion is hardly reduced. Therefore, it is not necessary to increase the diameters of the large end portion and the small end portion more than necessary. This laminated connecting rod has a simple structure in which a plurality of laminated parts are simply laminated, and the protrusions, recesses, and notches that connect adjacent laminated parts can be easily formed by pressing, so it is inexpensive. Can be manufactured.

この発明において、前記積層部品は、鋼板を打抜き加工して所定の形状に成形したものとすることができる。その場合、前記突起を有する積層部品は、素材となる鋼板に対し、前記打抜き加工の打抜き線を跨ぐ両側部が積層部品の面方向に対して出入りする方向に突出するように前記突起を成形した後、前記打抜き加工により所定の形状に成形するのがよい。また、前記切欠きを有する積層部品は、素材となる鋼板に対し、前記打抜き加工の打抜き線を跨ぐ両側部が除去されるように前記切欠きとなる貫通穴を加工した後、前記打抜き加工により所定の形状に成形するのがよい。 In the present invention, the laminated component may be formed by punching a steel plate into a predetermined shape. In that case, the laminated part having the protrusions is formed with respect to the steel plate as a raw material so that both side portions straddling the punching line of the punching process protrude in the direction of entering and exiting the surface direction of the laminated part. Then, it is good to shape | mold into a predetermined shape by the said punching process. In addition, the laminated part having the notch is formed by cutting the through hole serving as the notch so that both side portions straddling the punching line of the punching process are removed from the steel plate as the material, and then performing the punching process. It is good to mold into a predetermined shape.

上記のように突起を成形した後、打抜き加工で所定の形状に成形すれば、打抜き加工時に突起の打抜き線よりも外に出ている部分が除去されて、突起がコンパクトになる。また、上記のように切欠きとなる貫通穴を形成した後、打抜き加工で所定の形状に成形すれば、打抜き線の位置で貫通穴が分断されて、その中心側部分が前記突起に対応したコンパクトな切欠きになる。突起および切欠きがコンパクトであれば、積層部品の大端部分および小端部分の縁部の強度低下を小さく抑えられる。 If the protrusion is formed as described above and then formed into a predetermined shape by punching, a portion of the protrusion that is outside the punching line is removed during the punching process, and the protrusion becomes compact. In addition, after forming the through hole to be a notch as described above, if the punching is formed into a predetermined shape, the through hole is divided at the position of the punching line, and the center side portion corresponds to the projection. It becomes a compact cutout. If the protrusion and the notch are compact, the strength reduction of the edge of the large end portion and the small end portion of the laminated component can be suppressed to a small level.

前記突起および切欠きを、積層部品の大端部分および小端部分の縁部の各１箇所以上の箇所に成形または形成するのがよく、複数箇所に成形または形成してもよい。
突起および切欠きを大小端部の各１箇所以上に成形または形成すると、隣合う積層部品同士を強固に結合することができる。複数箇所に成形または形成した場合は、より強固に結合することができる。 The protrusions and notches may be molded or formed at one or more locations on the edges of the large end portion and the small end portion of the laminated component, or may be molded or formed at multiple locations.
When the protrusions and notches are molded or formed at one or more locations on the large and small end portions, the adjacent laminated parts can be firmly bonded. When formed or formed at a plurality of locations, it is possible to bond more firmly.

前記大端部分、小端部分、およびロッド部分を有する積層部品を真ん中に配置し、この積層部品の大端部分の両側に前記大端部分を有する積層部品を配置すると共に、小端部分の両側に前記小端部分を有する積層部品を配置して、各積層部品を積層した構成とすることができる。
この構成とすると、大端部分および小端部分の幅方向中央部にロッド部分が位置するようになり、全体のバランスが良好である。 The laminated part having the large end part, the small end part and the rod part is arranged in the middle, the laminated part having the large end part is arranged on both sides of the large end part of the laminated part, and both sides of the small end part are arranged. The laminated parts having the small end portions may be arranged on the laminated parts so that the laminated parts are laminated.
With this configuration, the rod portion is positioned at the center in the width direction of the large end portion and the small end portion, and the overall balance is good.

この発明の積層コンロッドは、大端部分、小端部分、およびロッド部分を有する積層部品と、大端部分を有する積層部品と、小端部分を有する積層部品とを積層し、各積層部品の大端部分および小端部分の外周縁の一部となる縁部にプレス加工により成形されて積層部品の面方向に対して出入りする方向に突出する突起と、この突起の裏面に生じた凹部との噛み合い、または上記突起とは別に形成された切欠きとの噛み合いによって、隣合う積層部品同士を結合させたため、大端部分および小端部分の厚みが厚く、これら大端部分および小端部分に圧入される軸受の内径精度を確保することができ、簡単な構造で安価に製造できる。 The laminated connecting rod of the present invention comprises a laminated component having a large end portion, a small end portion, and a rod portion, a laminated component having a large end portion, and a laminated component having a small end portion. A protrusion formed in the edge part which is a part of the outer peripheral edge of the end part and the small end part and protruding in the direction of entering and exiting the surface direction of the laminated component, and a recess generated on the back surface of the protrusion Adjacent laminated parts are joined together by meshing or engaging with a notch formed separately from the above protrusions, so the large end portion and the small end portion are thick, and the large end portion and the small end portion are press-fitted. The inner diameter accuracy of the bearing can be ensured, and the bearing can be manufactured at a low cost with a simple structure.

この発明の実施形態を図１および図２と共に説明する。図１（Ａ）は積層コンロッドの分解状態を示す斜視図、図１（Ｂ）は組立状態を示す斜視図である。この積層コンロッド１は、鋼板を加工してなる複数の板状の積層部品２を積層して一体化したものである。複数の積層部品２は、大端部分２ａ、小端部分２ｂ、およびロッド部分２ｃを有する積層部品２Ａと、大端部分２ａを有する積層部品２Ｂと、小端部分２ｂを有する積層部品２Ｃとでなる。説明の便宜上、積層部品２Ａを主積層部品、積層部品２Ｂを大端用積層部品、積層部品２Ｃを小端用積層部品とする。各積層部品２Ａ，２Ｂ，２Ｃの大端部分２ａにはクランクピンが挿通される軸受嵌合穴３が、小端部分２ｂにはピストンピンが挿通される軸受嵌合穴４がそれぞれ設けられている。この実施形態では、主積層部品２Ａは２枚、大端用積層部品２Ｂおよび小端用積層部品２Ｃはそれぞれ４枚であり、積層した２枚の主積層部品２Ａの大端部分２ａの両側に大端用積層部品２Ｂを２枚ずつ配置して積層すると共に、主積層部品２Ａの小端部分２ｂの両側に小端用積層部品２Ｃを２枚ずつ配置して積層してある。 An embodiment of the present invention will be described with reference to FIGS. FIG. 1A is a perspective view showing an exploded state of a laminated connecting rod, and FIG. 1B is a perspective view showing an assembled state. The laminated connecting rod 1 is formed by laminating and integrating a plurality of plate-like laminated components 2 formed by processing steel plates. The plurality of laminated components 2 are composed of a laminated component 2A having a large end portion 2a, a small end portion 2b, and a rod portion 2c, a laminated component 2B having a large end portion 2a, and a laminated component 2C having a small end portion 2b. Become. For convenience of explanation, the laminated component 2A is a main laminated component, the laminated component 2B is a large-end laminated component, and the laminated component 2C is a small-end laminated component. A bearing fitting hole 3 through which a crank pin is inserted is provided in the large end portion 2a of each laminated component 2A, 2B, 2C, and a bearing fitting hole 4 through which a piston pin is inserted is provided in the small end portion 2b. Yes. In this embodiment, there are two main laminated components 2A, four large-end laminated components 2B and four small-end laminated components 2C, on both sides of the large end portion 2a of the two laminated main laminated components 2A. Two large-end laminated components 2B are arranged and laminated, and two small-end laminated components 2C are arranged and laminated on both sides of the small end portion 2b of the main laminated component 2A.

図２は図１（Ｂ）のII部断面図である。同図に示す主積層部品２Ａと小端用積層部品２Ｃの結合部に基づき、各積層部品２Ａ，２Ｂ，２Ｃの結合構造を説明する。一方の最外側に配置される積層部品２Ｃを除く各積層部品２Ａ，２Ｃの小端部分２ｂの外周縁の一部となる縁部には、積層部品２Ａ，２Ｃの面方向に対して出入りする方向に突出する突起５が設けられている。突起５の裏面には、突起５の突出方向と同方向に凹む凹部６が生じている。また、前記最外側に配置される積層部品２Ｃの小端部分２ｂの縁部には、前記突起５と円周方向同位置かつ円周方向長さおよび縁部からの深さが同寸法の切欠き７が設けられている。隣合う積層部品２Ａ，２Ｃの突起５と凹部６、または突起５と切欠き７とが噛み合うことにより、隣合う積層部品２Ａ，２Ｃ同士が結合される。主積層部品２Ａと大端用積層部品２Ｂの結合部も同じ構造である（図示省略）。
図１および図５に示すように、突起５および切欠き７は、大端部分２ａおよび小端部分２ｂの円周方向の各１箇所以上、本例では３箇所に設けられている。このように、突起５および切欠き７を大小端部の各１箇所以上に設けると、隣合う積層部品２Ａ，２Ｂ，２Ｃ同士を強固に結合することができる。本例のように突起５および切欠き７が３箇所に設けられていると、より強固に結合することができる。 FIG. 2 is a cross-sectional view taken along a line II in FIG. Based on the coupling portion between the main laminated component 2A and the small end laminated component 2C shown in the figure, the coupling structure of the laminated components 2A, 2B, 2C will be described. The edge part which becomes a part of the outer peripheral edge of the small end portion 2b of each of the laminated parts 2A and 2C excluding the laminated part 2C arranged on the outermost side goes in and out with respect to the surface direction of the laminated parts 2A and 2C. A protrusion 5 protruding in the direction is provided. On the back surface of the protrusion 5, a recess 6 that is recessed in the same direction as the protrusion 5 is formed. Further, the edge of the small end portion 2b of the laminated component 2C disposed on the outermost side is cut at the same position in the circumferential direction as the projection 5, the length in the circumferential direction and the depth from the edge are the same dimension. A notch 7 is provided. Adjacent laminated parts 2A and 2C are coupled to each other by engaging the protrusions 5 and the recesses 6 of the adjacent laminated parts 2A and 2C, or the protrusions 5 and the notches 7 with each other. The joint portion of the main laminated component 2A and the large end laminated component 2B has the same structure (not shown).
As shown in FIGS. 1 and 5, the protrusions 5 and the notches 7 are provided at one or more locations in the circumferential direction of the large end portion 2a and the small end portion 2b, in this example, at three locations. Thus, if the protrusion 5 and the notch 7 are provided in one or more places on each of the large and small end portions, the adjacent laminated components 2A, 2B, 2C can be firmly bonded. When the protrusions 5 and the notches 7 are provided at three positions as in this example, the bonding can be more firmly performed.

各積層部品２Ａ，２Ｂ，２Ｃの製作方法を、図３ないし図５と共に説明する。図３に示すように、積層部品２Ａ，２Ｂ，２Ｃは、素材となる鋼板１０を打抜き線１１に沿って打抜き加工して所定の形状に成形する。但し、上記打抜き加工に先立って、突起５および切欠き７を成形する。その際、突起５については、図４（Ａ），（Ｂ），（Ｃ）に示すように、前記打抜き線１１を跨ぐ両側部が鋼板１０の面方向、すなわち積層部品２Ａ，２Ｂ，２Ｃの面方向に対して出入りする方向に突出するように、プレス加工により原形突起８を成形する。切欠き７については、図４（Ｄ）に示すように、前記打抜き線１１を跨ぐ両側部が除去されるように、穴あけ加工により切欠き７となる貫通穴９を形成する。原形突起８および貫通穴９を加工した後、打抜き線１１に沿って打抜き加工して、積層部品２Ａ，２Ｂ，２Ｃとする。このようにして得られた積層部品２Ａ，２Ｂ，２Ｃの突起５は、図５（Ａ），（Ｂ），（Ｃ）に示すように、原形突起８に対して打抜き線１１よりも外側の部分が除去されたコンパクトなものとなる。突起５の裏面側には、突起５の突出方向と同方向に凹む凹部６が生じている。また、積層部品２Ｂ，２Ｃの切欠き７は、図５（Ｄ）に示すように、打抜き線１１の位置で分断された貫通穴９の中心側部分であり、突起５に対応したコンパクトなものとなる。 A method of manufacturing each of the laminated parts 2A, 2B, 2C will be described with reference to FIGS. As shown in FIG. 3, the laminated parts 2 A, 2 B, and 2 C are formed by punching a steel plate 10 as a material along a punching line 11 into a predetermined shape. However, prior to the punching process, the protrusion 5 and the notch 7 are formed. At that time, as shown in FIGS. 4 (A), (B), and (C), the protrusion 5 has both side portions straddling the punching line 11 in the surface direction of the steel plate 10, that is, the laminated parts 2A, 2B, and 2C. The original projection 8 is formed by pressing so as to protrude in the direction in and out of the surface direction. About the notch 7, as shown in FIG.4 (D), the through-hole 9 used as the notch 7 is formed by drilling so that the both sides which straddle the said punching line 11 may be removed. After processing the original projection 8 and the through hole 9, punching is performed along the punching line 11 to obtain the laminated components 2 A, 2 B, and 2 C. The protrusions 5 of the laminated parts 2A, 2B, and 2C obtained in this way are outside the punching line 11 with respect to the original protrusion 8 as shown in FIGS. 5 (A), (B), and (C). It becomes a compact one with parts removed. On the back side of the protrusion 5, a recess 6 is formed that is recessed in the same direction as the protrusion 5 protrudes. Further, the cutout 7 of the laminated parts 2B and 2C is a central portion of the through hole 9 divided at the position of the punching line 11 as shown in FIG. It becomes.

図３ないし図５の製作方法で例示した突起５および切欠き７は、その原形となる原形突起８および貫通穴９を積層部品２Ａ，２Ｂ，２Ｃの面方向に対して直交する方向から見た形状が、打抜き線１１に沿う方向に長く両端が半円形をした繭状とされているが、これに限らない。例えば、前記方向から見た原形突起８および貫通穴９の形状を、三角形、四角形、円形、あるいは他の形状としてもよい。 The protrusion 5 and the notch 7 illustrated in the manufacturing method of FIGS. 3 to 5 are the original shape of the original protrusion 8 and the through hole 9 viewed from a direction orthogonal to the surface direction of the laminated components 2A, 2B, and 2C. The shape is a bowl shape that is long in the direction along the punching line 11 and semi-circular at both ends, but is not limited thereto. For example, the shapes of the original projection 8 and the through hole 9 viewed from the above direction may be triangular, quadrangular, circular, or other shapes.

上記方法で製作された積層部品２Ａ，２Ｂ，２Ｃを前記所定の配置で積層し、突起５と凹部６、および突起５と切欠き７とを互いに噛み合わせて隣合う積層部品同士を結合させることにより、積層コンロッド１が完成する。完成した積層コンロッド１は、大端部分１ａおよび小端部分１ｂは６枚の積層部品が積層され、ロッド部分１ｃは２枚の積層部品が積層されているため、大端部分１ａおよび小端部分１ｂの厚みは厚く、ロッド部分１ｃの厚みは薄い。この積層コンロッド１は、複数の積層部品２Ａ，２Ｂ，２Ｃを積層しただけの簡単な構造であり、隣合う積層部品同士を結合する突起５、凹部６、および切欠き７はプレス加工により容易に成形することができるため、安価に製造できる。突起５、凹部６、および切欠き７は、積層部品２Ａ，２Ｂ，２Ｃの大端部分２ａおよび小端部分２ｂの縁部に設けられるため、大端部分２ａおよび小端部分２ｂの強度低下をほとんど招かない。そのため、大端部分２ａおよび小端部分２ｂの径を必要以上に大きくする必要がない。 Laminate parts 2A, 2B, 2C manufactured by the above method are laminated in the predetermined arrangement, and the protrusions 5 and the recesses 6 and the protrusions 5 and the notches 7 are meshed with each other so that adjacent laminated parts are joined together. Thus, the laminated connecting rod 1 is completed. In the completed laminated connecting rod 1, since the large end portion 1a and the small end portion 1b are laminated with six laminated components, and the rod portion 1c is laminated with two laminated components, the large end portion 1a and the small end portion are laminated. The thickness of 1b is thick, and the thickness of the rod portion 1c is thin. The laminated connecting rod 1 has a simple structure in which a plurality of laminated parts 2A, 2B, and 2C are laminated, and the protrusion 5, the concave part 6, and the notch 7 that connect adjacent laminated parts are easily formed by pressing. Since it can be molded, it can be manufactured at low cost. Since the protrusion 5, the recess 6, and the notch 7 are provided at the edges of the large end portion 2a and the small end portion 2b of the laminated parts 2A, 2B, 2C, the strength of the large end portion 2a and the small end portion 2b is reduced. Almost no invitation. Therefore, it is not necessary to increase the diameters of the large end portion 2a and the small end portion 2b more than necessary.

図６は、上記実施形態の積層コンロッド１をエンジンに組み付けた状態を示す。エンジンの構成については、発明が解決しようとする課題の欄で既に説明しているので、ここでは説明を省略する。上記実施形態の積層コンロッド１は、上述したように、大端部分１ａおよび小端部分１ｂの厚みは厚く、ロッド部分１ｃの厚みは薄い。そのため、大端部分１ａおよび小端部分１ｂの軸受嵌合穴１０３，１０４に圧入される軸受１０５の圧入部の幅を十分にとって、軸受１０５の内径精度を十分に確保すると共に、積層コンロッド１に対する軸受１０５の抜けを防止できる。また、一対のバランスウェイト１０９ａ間が狭くてもロッド部分１ｃが通過することが可能であるため、設計の自由度が高い。 FIG. 6 shows a state where the laminated connecting rod 1 of the above embodiment is assembled to an engine. Since the configuration of the engine has already been described in the column of the problem to be solved by the invention, the description thereof is omitted here. In the laminated connecting rod 1 of the above embodiment, as described above, the large end portion 1a and the small end portion 1b are thick, and the rod portion 1c is thin. Therefore, the width of the press-fitting portion of the bearing 105 to be press-fitted into the bearing fitting holes 103 and 104 of the large end portion 1a and the small end portion 1b is sufficiently ensured, and the inner diameter accuracy of the bearing 105 is sufficiently secured, and the stacked connecting rod 1 is It is possible to prevent the bearing 105 from coming off. Further, since the rod portion 1c can pass even if the distance between the pair of balance weights 109a is narrow, the degree of freedom in design is high.

上記実施形態では、積層コンロッド１の大端部分１ａおよび小端部分１ｂは６枚の積層部品２Ａ，２Ｂ，２Ｃを積層し、ロッド部分１ｃは２枚の積層部品２Ａを積層した構成としたが、適用されるエンジンの仕様に応じて各部の積層部品の積層枚数を適宜変更することができる。 In the above embodiment, the large connecting portion 1a and the small end portion 1b of the laminated connecting rod 1 have six laminated components 2A, 2B, and 2C laminated, and the rod portion 1c has a constitution in which two laminated components 2A are laminated. The number of laminated parts of each part can be changed as appropriate according to the specifications of the engine to be applied.

（Ａ）はこの発明の実施形態にかかる積層コンロッドの分解状態を示す斜視図、（Ｂ）はその組立状態を示す斜視図である。(A) is a perspective view which shows the decomposition | disassembly state of the lamination | stacking connecting rod concerning embodiment of this invention, (B) is a perspective view which shows the assembly state. 図１（Ｂ）のII部の断面図である。It is sectional drawing of the II section of FIG. 1 (B). （Ａ）は素材となる鋼板に突起の加工位置および打抜き線の位置を想像線で示した図、（Ｂ）はそのIIIＢ部の拡大図である。(A) is the figure which showed the processing position of the processus | protrusion on the steel plate used as a raw material, and the position of the punching line with the imaginary line, (B) is the enlarged view of the IIIB part. （Ａ）は突起を加工した鋼板の一部を示す図、（Ｂ）はそのIVＢ部の拡大図、（Ｃ）はIVＣ−IVＣ断面図、（Ｄ）は別の鋼板の断面図である。(A) is a figure which shows a part of steel plate which processed the protrusion, (B) is an enlarged view of the IVB part, (C) is IVC-IVC sectional drawing, (D) is sectional drawing of another steel plate. （Ａ）は打抜き成形された積層部品の一部を示す図、（Ｂ）はそのＶＢ部の拡大図、（Ｃ）はそのＶＣ−ＶＣ断面図、（Ｄ）は別の積層部品の断面図である。(A) is a view showing a part of a punched and formed laminated part, (B) is an enlarged view of the VB portion, (C) is a sectional view of the VC-VC, and (D) is a sectional view of another laminated part. It is. 同積層コンロッドの使用例を示す断面図である。It is sectional drawing which shows the usage example of the laminated connecting rod. 従来のコンロッドの使用例を示す断面図である。It is sectional drawing which shows the usage example of the conventional connecting rod.

符号の説明Explanation of symbols

１…積層コンロッド
１ａ…積層コンロッドの大端部分
１ｂ…積層コンロッドの小端部分
１ｃ…積層コンロッドのロッド部分
２Ａ…主積層部品
２Ｂ…大端用積層部品
２Ｃ…小端用積層部品
２ａ…積層部品の大端部分
２ｂ…積層部品の小端部分
２ｃ…積層部品のロッド部分
５…突起
６…凹部
７…切欠き
１０…鋼板
１１…打抜き線 DESCRIPTION OF SYMBOLS 1 ... Laminated connecting rod 1a ... Large end portion 1b of laminated connecting rod ... Small end portion 1c of laminated connecting rod ... Rod portion 2A of laminated connecting rod ... Main laminated component 2B ... Laminated component 2C for large end ... Laminated component 2a for small end ... Laminated component Large end portion 2b ... small end portion 2c of laminated component ... rod portion 5 of laminated component ... projection 6 ... concave 7 ... notch 10 ... steel plate 11 ... punching line

Claims

大端部分、小端部分、およびロッド部分を有する積層部品と、大端部分を有する積層部品と、小端部分を有する積層部品とを積層し、各積層部品の大端部分および小端部分の外周縁の一部となる縁部にプレス加工により成形されて積層部品の面方向に対して出入りする方向に突出する突起と、この突起の裏面に生じた凹部との噛み合い、または上記突起とは別に形成された切欠きとの噛み合いによって、隣合う積層部品同士を結合させたことを特徴とする積層コンロッド。 A laminated part having a large end part, a small end part, and a rod part, a laminated part having a large end part, and a laminated part having a small end part are laminated, and the large end part and the small end part of each laminated part are laminated. Engagement between the protrusion formed in the edge that becomes a part of the outer peripheral edge and protruding in the direction of entering and exiting the surface direction of the laminated component and the recess formed on the back surface of the protrusion, or the protrusion A laminated connecting rod, wherein adjacent laminated parts are joined together by meshing with a notch formed separately.

請求項１において、前記積層部品は、鋼板を打抜き加工して所定の形状に成形したものである積層コンロッド。 2. The laminated connecting rod according to claim 1, wherein the laminated component is formed by punching a steel plate into a predetermined shape.

請求項２において、前記突起を有する積層部品は、素材となる鋼板に対し、前記打抜き加工の打抜き線を跨ぐ両側部が積層部品の面方向に対して出入りする方向に突出するように前記突起を成形した後、前記打抜き加工により所定の形状に成形したものである積層コンロッド。 3. The laminated part having the protrusions according to claim 2, wherein the protrusions are protruded in a direction in which both side portions straddling the punching line of the punching process come in and out with respect to the surface direction of the laminated part with respect to the steel plate as a material. A laminated connecting rod which is formed into a predetermined shape by the punching after being formed.

請求項２において、前記切欠きを有する積層部品は、素材となる鋼板に対し、前記打抜き加工の打抜き線を跨ぐ両側部が除去されるように前記切欠きとなる貫通穴を加工した後、前記打抜き加工により所定の形状に成形したものである積層コンロッド。 In claim 2, the laminated part having the notch, after processing the through-hole to be the notch so that both side portions straddling the punching line of the punching process is removed with respect to the steel plate as the material, A laminated connecting rod formed into a predetermined shape by punching.

請求項１ないし請求項４のいずれか１項において、前記突起および切欠きを、積層部品の大端部分および小端部分の縁部の複数箇所に設けた積層コンロッド。 5. The laminated connecting rod according to claim 1, wherein the protrusions and the notches are provided at a plurality of locations on the edges of the large end portion and the small end portion of the laminated component.

請求項１ないし請求項５のいずれか１項において、前記大端部分、小端部分、およびロッド部分を有する積層部品を真ん中に配置し、この積層部品の大端部分の両側に前記大端部分を有する積層部品を配置すると共に、小端部分の両側に前記小端部分を有する積層部品を配置して、各積層部品を積層した積層コンロッド。 6. A laminated part having the large end part, the small end part, and the rod part is arranged in the middle, and the large end part is disposed on both sides of the large end part of the laminated part. And a laminated connecting rod in which the laminated components are laminated by arranging the laminated components having the small end portions on both sides of the small end portion.