JP4146578B2 - Connecting rod for engine and manufacturing method thereof - Google Patents

Connecting rod for engine and manufacturing method thereof Download PDF

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Publication number
JP4146578B2
JP4146578B2 JP17110999A JP17110999A JP4146578B2 JP 4146578 B2 JP4146578 B2 JP 4146578B2 JP 17110999 A JP17110999 A JP 17110999A JP 17110999 A JP17110999 A JP 17110999A JP 4146578 B2 JP4146578 B2 JP 4146578B2
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Prior art keywords
cap
rod body
hole
connecting rod
screw hole
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JP17110999A
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JP2001003925A (en
Inventor
忠友 畑山
陽介 山崎
龍司 曽我
公夫 百瀬
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP17110999A priority Critical patent/JP4146578B2/en
Priority to US09/584,387 priority patent/US6427326B1/en
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  • Forging (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、ロッド本体とキャップとから成るエンジン用コンロッドに関する。
【０００２】
【従来の技術】
従来、特開昭６３−１９５４０８号公報により、ロッド本体とキャップとが一体化した形状のコンロッド素材を成形し、コンロッド素材を分割してロッド本体とキャップとを得るようにしたものが知られている。
【０００３】
この場合、コンロッド素材にロッド本体側のねじ孔とねじ孔からキャップ側にのびるボルト挿通孔とから成るキャップ用の結合孔を形成し、分割後にロッド本体とキャップとをボルト挿通孔を通してねじ孔に螺合させるボルトにより締結し得るようにしている。
【０００４】
【発明が解決しようとする課題】
上記の如くコンロッド素材を分割してロッド本体とキャップとを得る場合、ロッド本体とキャップとの割面は凹凸のある脆性破断面となる。そのため、ボルト挿通孔に圧入される軸部を有する特殊なボルトを用いなくても、割面の凹凸の係合でロッド本体に対するキャップの位置ずれを防止でき、その結果、ボルトの締付け及び緩めが容易になり、コンロッドの組立・分解の作業性が向上する。
【０００５】
ところで、ボルト挿通孔は、ねじ孔のタッピング加工に用いるタップの外径、即ち、ねじ孔の谷径より大径に形成されており、ボルトに対し比較的大きな遊びがある。そのため、キャップの割面の凹凸がロッド本体の割面の対応する凹凸とは異なる凹凸に係合した状態でロッド本体にキャップが締結されてしまうことがあり、ロッド本体とキャップとの組付精度を確保する上で問題になっている。
【０００６】
本発明は、以上の点に鑑み、キャップの割面の凹凸をロッド本体の割面の対応する凹凸に係合させた状態でロッド本体にキャップを締結し得るようにした組付精度の高いコンロッドを提供することを課題としている。
【０００７】
【課題を解決するための手段】
上記課題を解決すべく、本発明は、ロッド本体とキャップとから成るエンジン用コンロッドであって、ロッド本体とキャップとが一体化した形状に成形したコンロッド素材にロッド本体側のねじ孔とねじ孔からキャップ側にのびるボルト挿通孔とから成るキャップ用の結合孔を形成し、コンロッド素材を分割して得られたロッド本体とキャップとをボルト挿通孔を通してねじ孔に螺合させるボルトにより締結するものにおいて、ボルト挿通孔を、キャップの外面寄りの大径部と、大径部に対しキャップ内の段差部を存してねじ孔側にのびる小径部とを有する段付孔に形成し、小径部をキャップとロッド本体とに亘って形成するとともに、小径部の径を、ボルトの外径より大きくねじ孔の谷径より小さくしている。
【０００８】
このように、ボルト挿通孔にねじ孔の谷径より径の小さな小径部を形成するため、ボルトに対するボルト挿通孔の遊びが小さくなり、キャップの割面の凹凸がロッド本体の割面の対応する凹凸とは異なる凹凸に対向する位置までずれることが防止される。かくて、キャップの割面の凹凸をロッド本体の割面の対応する凹凸に係合させた状態でロッド本体にキャップを締結でき、ロッド本体とキャップとの組付精度が確保される。
【０００９】
【発明の実施の形態】
図１は、ロッド本体１とキャップ２とから成るエンジン用コンロッドの製造工程を示している。コンロッドの製造に際しては、先ず、下記の組成の冷間鍛造用鋼で形成される図１（ａ）に示すプリフォーム素材３から図１（ｂ）に示す如きロッド本体１とキャップ２とが一体化した形状のコンロッド素材４を冷間鍛造で成形する。冷間鍛造用鋼は、重量％で、Ｃ：０．０５〜０．２５％，Ｓｉ：０．３５〜０．６０％，Ｍｎ：０．２０〜１．３０％，Ｃｒ：０．１５〜０．６０％を含有し、更に、Ｓ：０．０３０〜０．１００％，Ｔｅ：０．００５〜０．０４０％，Ｐｂ：０．０３〜０．３０％，Ｂｉ：０．０３〜０．２０％，Ｃａ：０．０００５〜０．００５０％のうちから選ばれる１種または２種以上を含有する、残部がＦｅから成る、下記（１）および（２）式
19≦85(%C)+9(%Si)+3(%Mn)+5(%Cr)≦25 …（１）
100(%C)+3(%Si)+3(%Mn)-9(%Cr)+100(%S)-20(%Te)≦23 …（２）
を満足する組成であり、冷間鍛造性及び疲労強度に優れている。
【００１０】
次に、コンロッド素材４の小端部５と大端部６の端面研削と、大端部６の内面研削とを行うと共に、図１（ｃ）に示す如く、大端部６の内面の分割用の切欠き７，７の加工と、大端部６の両脇のキャップ用の結合孔８，８の加工とを行う。
【００１１】
以上の機械加工が完了すると、次に図１（ｄ）に示す如く、コンロッド素材４をチェーンコンベア（図示せず）に吊下げた状態で大端部６を低温処理槽９内の液体窒素に浸漬して、大端部６に低温処理を施し、続いて大端部６を破断して、図１（ｅ）に示す如くコンロッド素材４をロッド本体１とキャップ２とに分割する。尚、低温処理では、分割時に大端部６の温度が脆性遷移温度たる−１３０℃以下に維持されるように、大端部６を冷却する。
【００１２】
コンロッド素材４の分割は図２及び図３に示す分割装置１０を用いて行う。この分割装置は、基台１０１と基台１０１上に設けた治具台１０２とを備えている。
治具台１０２には、小端部５をコンロッド素材４の長手方向に摺動自在に、且つ、長手方向と直交方向への振れを生じないように支持する溝形の支持部材１０３と、大端部６のキャップ側半部を支持する支持板１０４と、大端部６の本体側半部を支持する支持板１０５とが設けられている。支持板１０４は治具台１０２に固定されており、一方、支持板１０５は、治具台１０２に形成したガイド溝１０６に案内されてコンロッド素材４の長手方向に摺動自在であり、支持板１０４との間に張設した両脇のばね１０７，１０７で支持板１０４側に付勢されている。両支持板１０４，１０５には、大端部６の内周に挿入される半円形の駒１０８，１０９が立設されている。両駒１０８，１０９間には、基台１０１に取付けた油圧シリンダ１０１０で上下動される楔部材１０１１が設けられており、楔部材１０１１の駒１０９側の面をオーバーハングした傾斜面に形成し、楔部材１０１１を下動させたとき、駒１０９がばね１０７の付勢力に抗して駒１０８から離間する方向に押動されるようにしている。治具台１０２には、更に、大端部６のキャップ側半部を駒１０８との間にクランプする、シリンダ１０１２で開閉動作されるクランプ部材１０１３と、分割後のロッド本体の飛出しを防止する１対のストッパ１０１４，１０１４とが設けられている。
【００１３】
コンロッド素材４の分割に際しては、低温処理されたコンロッド素材４をロボット等の自動機（図示せず）により小端部５が支持部材１０３に係合し、大端部６の内周に駒１０８，１０９が挿入されるように治具台１０２上にセットする。次に、クランプ部材１０１３を閉じてから、楔部材１０１１を下動させる。これによれば、大端部６の本体側半部が駒１０９を介して小端部５側に押圧され、切欠き７，７を起点にして大端部６が脆性破断され、コンロッド素材４がロッド本体１とキャップ２とに分割される。
【００１４】
分割が完了すると、ロッド本体１とキャップ２とを、図１（ｆ）に示す如く、温水を入れた昇温処理槽１２内で循環するパレット１２ａに自動機（図示せず）により載置し、ロッド本体１とキャップ２とを常温に戻す昇温処理を行う。次に、ロッド本体１とキャップ２との割面を、図１（ｇ）に示す如く、砥粒入りナイロンブラシ１３でブラッシングする。
【００１５】
ここで、ロッド本体１とキャップ２との割面は、図４に示す如く、凹凸のある脆性破断面となっている。そして、割面に、図５（Ａ）に示す如く、凹凸に重畳して微小突起が形成されることがあり、このままでは、ロッド本体１にキャップ２を組付ける際に、微小突起が欠けてロッド本体１とキャップ２との割面間に噛み込み、ロッド本体１とキャップ２との組付精度が悪くなる。一方、上記の如くブラッシングを行うと、図５（Ｂ）に示す如く欠け易い微小突起が除去され、上記不具合が防止される。
【００１６】
ブラッシング後は割面の洗浄とエアブローとを行い、次に、ロッド本体１にキャップ２を、図１（ｈ）に示す如く、結合孔８においてボルト１４により締結する。そして、小端部５にブシュ（図示せず）を圧入し、ブシュの内面と大端部６の内面の仕上げ加工を行う。
【００１７】
結合孔８は、図４に示す如く、ロッド本体１側のねじ孔８１と、ねじ孔８１からキャップ２側にのびるボルト挿通孔８２とで構成されている。そして、ボルト挿通孔８２を、キャップ２の外面寄りの大径部８２ａと、大径部８２ａに対しキャップ２内の段差部８２ｂを存してねじ孔８１側にのびる小径部８２ｃとを有する段付孔に形成している。小径部８２ｃの径ａは、ボルト１４の外径ｂより大きく、ねじ孔８１の谷径ｃより小さな値に設定されている。尚、ねじ孔８１の谷径ｃとボルト１４の外径ｂとの径差は約０．１ｍｍである。
【００１８】
結合孔８の加工に際しては、ねじ孔８１の下孔と共に小径部８２ｃも同時に加工し、ねじ孔８１の下孔と小径部８２ｃとの同軸度を確保する。その後、ねじ孔８のタッピング加工を行うが、小径部８２ｃはねじ孔８１の谷径ｃ、即ち、タップ外径よりも小径であるため、小径部８２ｃの内面に浅い螺旋溝８２ｄが形成される。
【００１９】
ロッド本体１にキャップ２を締結する際は、ボルト１４をキャップ２側からボルト挿通孔８２を通してねじ孔８１に螺合させる。この場合、ボルト１４に対するボルト挿通孔８２の遊び、即ち、ロッド本体１に対するキャップ２のずれは小径部８２ｃにより０．１ｍｍ以下に規制される。ここで、割面の微小な凹凸を除く１次的な凹凸の平均ピッチは約０．１５ｍｍであり、キャップ２の割面の凹凸がロッド本体１の割面の対応する凹凸とは異る凹凸に対向する位置までずれることはない。かくて、キャップ２の割面の凹凸をロッド本体１の割面の対応する凹凸に係合させた状態でロッド本体１にキャップ２を正確に締結することができる。
【００２０】
【発明の効果】
以上の説明から明らかなように、本発明によれば、ボルトに対するボルト挿通孔の遊びを小さくして、キャップの割面の凹凸がロッド本体の割面の対応する凹凸とは異なる凹凸に対向する位置までずれることを防止でき、ロッド本体とキャップとの組付精度が確保される。
【図面の簡単な説明】
【図１】 （ａ）〜（ｈ）コンロッドの製造工程を示す図
【図２】 分割装置の平面図
【図３】 図２のIII−III線截断面図
【図４】 ロッド本体とキャップとの結合部の拡大断面図
【図５】 （Ａ）割面の一部分のブラッシング前の凹凸の計測結果を示すグラフ、（Ｂ）割面の前記部分のブラッシング後の凹凸の計測結果を示すグラフ
【符号の説明】
１ ロッド本体 ２キャップ ４ コンロッド素材
８ 結合孔 ８１ ねじ孔 ８２ ボルト挿通孔
８２ａ 大径部 ８２ｂ 段差部 ８２ｃ 小径部
１４ ボルト[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connecting rod for an engine comprising a rod body and a cap.
[0002]
[Prior art]
Conventionally, according to Japanese Patent Laid-Open No. Sho 63-195408, a connecting rod material in which a rod body and a cap are integrated is formed, and the connecting rod material is divided to obtain a rod body and a cap. Yes.
[0003]
In this case, a connecting hole for the cap consisting of a screw hole on the rod body side and a bolt insertion hole extending from the screw hole to the cap side is formed in the connecting rod material, and after splitting, the rod body and the cap are screwed into the screw hole through the bolt insertion hole. It can be fastened with bolts to be screwed together.
[0004]
[Problems to be solved by the invention]
When the connecting rod material is divided as described above to obtain the rod main body and the cap, the split surface between the rod main body and the cap has a fragile brittle fracture surface. For this reason, even if a special bolt having a shaft portion press-fitted into the bolt insertion hole is not used, the cap can be prevented from being displaced with respect to the rod body by engaging the unevenness of the split surface, so that the bolt can be tightened and loosened. It becomes easy and the workability of assembling / disassembling the connecting rod is improved.
[0005]
By the way, the bolt insertion hole is formed to have a larger diameter than the outer diameter of the tap used for tapping the screw hole, that is, the valley diameter of the screw hole, and has a relatively large play with respect to the bolt. For this reason, the cap may be fastened to the rod body with the unevenness of the split surface of the cap engaged with the unevenness different from the corresponding unevenness of the split surface of the rod body. It has become a problem in securing.
[0006]
In view of the above, the present invention is a connecting rod with high assembling accuracy that allows the cap to be fastened to the rod body in a state where the unevenness of the split surface of the cap is engaged with the corresponding unevenness of the split surface of the rod body. It is an issue to provide.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is an engine connecting rod comprising a rod body and a cap, wherein the rod body side screw hole and screw hole are formed in a connecting rod material formed into a shape in which the rod body and the cap are integrated. A coupling hole for the cap consisting of a bolt insertion hole extending from the cap to the cap side is formed, and the rod body obtained by dividing the connecting rod material and the cap are fastened by a bolt that is screwed into the screw hole through the bolt insertion hole The bolt insertion hole is formed in a stepped hole having a large diameter portion near the outer surface of the cap and a small diameter portion extending to the screw hole side with a step portion in the cap with respect to the large diameter portion. the thereby formed over the cap and the rod body, the diameter of the small diameter portion is smaller than the root diameter of the larger screw holes than the outer diameter of the bolt.
[0008]
Thus, since the small diameter portion smaller in diameter than the valley diameter of the screw hole is formed in the bolt insertion hole, the play of the bolt insertion hole with respect to the bolt is reduced, and the unevenness of the split surface of the cap corresponds to the split surface of the rod body. It is prevented that a position opposite to the unevenness different from the unevenness is deviated. Thus, the cap can be fastened to the rod body with the unevenness of the split surface of the cap engaged with the corresponding unevenness of the split surface of the rod body, and the assembly accuracy between the rod body and the cap is ensured.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a manufacturing process of a connecting rod for an engine composed of a rod body 1 and a cap 2. When manufacturing the connecting rod, first, the rod body 1 and the cap 2 as shown in FIG. 1 (b) are integrally formed from the preform material 3 shown in FIG. 1 (a) formed of cold forging steel having the following composition. The formed connecting rod material 4 is formed by cold forging. The steel for cold forging is% by weight: C: 0.05 to 0.25%, Si: 0.35 to 0.60%, Mn: 0.20 to 1.30%, Cr: 0.15 Containing 0.60%, S: 0.030-0.100%, Te: 0.005-0.040%, Pb: 0.03-0.30%, Bi: 0.03-0 .20%, Ca: containing one or more selected from 0.0005 to 0.0050%, the balance being Fe, the following formulas (1) and (2)
19 ≦ 85 (% C) +9 (% Si) +3 (% Mn) +5 (% Cr) ≦ 25 (1)
100 (% C) +3 (% Si) +3 (% Mn) -9 (% Cr) +100 (% S) -20 (% Te) ≦ 23 (2)
And is excellent in cold forgeability and fatigue strength.
[0010]
Next, the end surface grinding of the small end portion 5 and the large end portion 6 of the connecting rod material 4 and the inner surface grinding of the large end portion 6 are performed, and the inner surface of the large end portion 6 is divided as shown in FIG. The notches 7 and 7 are processed and the coupling holes 8 and 8 for the caps on both sides of the large end 6 are processed.
[0011]
When the above machining is completed, next, as shown in FIG. 1 (d), the large end portion 6 is turned into liquid nitrogen in the low-temperature treatment tank 9 with the connecting rod material 4 suspended on a chain conveyor (not shown). Immersion is performed, the large end portion 6 is subjected to a low-temperature treatment, and then the large end portion 6 is broken to divide the connecting rod material 4 into the rod body 1 and the cap 2 as shown in FIG. In the low-temperature treatment, the large end portion 6 is cooled so that the temperature of the large end portion 6 is maintained at −130 ° C. or less which is a brittle transition temperature at the time of division.
[0012]
The connecting rod material 4 is divided using a dividing apparatus 10 shown in FIGS. This dividing apparatus includes a base 101 and a jig base 102 provided on the base 101.
The jig base 102 has a groove-shaped support member 103 that supports the small end portion 5 so as to be slidable in the longitudinal direction of the connecting rod material 4 and not to cause a vibration in a direction orthogonal to the longitudinal direction. A support plate 104 that supports the cap-side half of the end 6 and a support plate 105 that supports the body-side half of the large end 6 are provided. The support plate 104 is fixed to the jig base 102, while the support plate 105 is guided by a guide groove 106 formed in the jig base 102 and is slidable in the longitudinal direction of the connecting rod material 4. It is urged toward the support plate 104 by springs 107 on both sides that are stretched between the support plate 104 and the side of the support plate 104. On both support plates 104 and 105, semicircular pieces 108 and 109 inserted on the inner periphery of the large end 6 are erected. A wedge member 1011 that is moved up and down by a hydraulic cylinder 1010 attached to the base 101 is provided between the two pieces 108 and 109. The surface of the wedge member 1011 on the piece 109 side is formed as an overhanging inclined surface. When the wedge member 1011 is moved downward, the piece 109 is pushed in a direction away from the piece 108 against the urging force of the spring 107. Further, the jig base 102 clamps the cap-side half of the large end 6 between the piece 108 and the clamp member 1013 that is opened and closed by the cylinder 1012, and prevents the rod body from being split out. A pair of stoppers 1014 and 1014 are provided.
[0013]
When the connecting rod material 4 is divided, the small end portion 5 of the connecting rod material 4 subjected to low temperature treatment is engaged with the support member 103 by an automatic machine (not shown) such as a robot, and a piece 108 is formed on the inner periphery of the large end portion 6. , 109 are set on the jig base 102 so as to be inserted. Next, after closing the clamp member 1013, the wedge member 1011 is moved downward. According to this, the main body side half of the large end 6 is pressed toward the small end 5 via the piece 109, the large end 6 is brittlely fractured starting from the notches 7, 7, and the connecting rod material 4. Is divided into a rod body 1 and a cap 2.
[0014]
When the division is completed, the rod body 1 and the cap 2 are placed by an automatic machine (not shown) on the pallet 12a circulating in the temperature raising treatment tank 12 containing hot water, as shown in FIG. 1 (f). Then, a temperature raising process for returning the rod body 1 and the cap 2 to room temperature is performed. Next, the split surface of the rod body 1 and the cap 2 is brushed with an abrasive nylon brush 13 as shown in FIG.
[0015]
Here, the split surface of the rod body 1 and the cap 2 has a fragile brittle fracture surface as shown in FIG. Then, as shown in FIG. 5A, a minute projection may be formed on the split surface so as to be superimposed on the unevenness. If this is the case, when the cap 2 is assembled to the rod body 1, the minute projection is missing. The rod body 1 and the cap 2 are caught between the split surfaces, and the assembly accuracy of the rod body 1 and the cap 2 is deteriorated. On the other hand, when brushing is performed as described above, the minute protrusions that are easily chipped are removed as shown in FIG.
[0016]
After brushing, the split surface is cleaned and air blown, and then the cap 2 is fastened to the rod body 1 with bolts 14 in the coupling holes 8 as shown in FIG. Then, a bush (not shown) is press-fitted into the small end portion 5 to finish the inner surface of the bush and the inner surface of the large end portion 6.
[0017]
As shown in FIG. 4, the coupling hole 8 includes a screw hole 81 on the rod body 1 side and a bolt insertion hole 82 extending from the screw hole 81 to the cap 2 side. The bolt insertion hole 82 has a large diameter portion 82a near the outer surface of the cap 2 and a small diameter portion 82c extending to the screw hole 81 side with a step portion 82b in the cap 2 with respect to the large diameter portion 82a. It is formed in a hole. The diameter a of the small diameter portion 82 c is set to a value larger than the outer diameter b of the bolt 14 and smaller than the valley diameter c of the screw hole 81. The difference in diameter between the valley diameter c of the screw hole 81 and the outer diameter b of the bolt 14 is about 0.1 mm.
[0018]
When the coupling hole 8 is processed, the small diameter portion 82c is simultaneously processed together with the lower hole of the screw hole 81 to ensure the coaxiality between the lower hole of the screw hole 81 and the small diameter portion 82c. Thereafter, tapping of the screw hole 8 is performed. Since the small diameter portion 82c is smaller than the valley diameter c of the screw hole 81, that is, the outer diameter of the tap, a shallow spiral groove 82d is formed on the inner surface of the small diameter portion 82c. .
[0019]
When the cap 2 is fastened to the rod body 1, the bolt 14 is screwed into the screw hole 81 from the cap 2 side through the bolt insertion hole 82. In this case, the play of the bolt insertion hole 82 with respect to the bolt 14, that is, the displacement of the cap 2 with respect to the rod body 1 is restricted to 0.1 mm or less by the small diameter portion 82c. Here, the average pitch of the primary unevenness excluding the minute unevenness of the split surface is about 0.15 mm, and the unevenness of the split surface of the cap 2 is different from the corresponding unevenness of the split surface of the rod body 1. The position does not shift to the position opposite to. Thus, the cap 2 can be accurately fastened to the rod body 1 with the unevenness of the split surface of the cap 2 engaged with the corresponding unevenness of the split surface of the rod body 1.
[0020]
【The invention's effect】
As is clear from the above description, according to the present invention, the play of the bolt insertion hole with respect to the bolt is reduced, and the unevenness of the split surface of the cap faces the unevenness different from the corresponding unevenness of the split surface of the rod body. The position can be prevented from being displaced, and the assembly accuracy between the rod body and the cap is ensured.
[Brief description of the drawings]
[Fig. 1] (a) to (h) Diagram showing manufacturing process of connecting rod [Fig. 2] Plan view of splitting device [Fig. 3] Sectional view taken along line III-III in Fig. 2 [Fig. [FIG. 5] (A) A graph showing the measurement result of the unevenness of the part of the split surface before brushing, (B) A graph showing the measurement result of the unevenness of the part of the split surface after brushing [ Explanation of symbols]
1 Rod body 2 Cap 4 Connecting rod material 8 Connection hole 81 Screw hole 82 Bolt insertion hole 82a Large diameter portion 82b Stepped portion 82c Small diameter portion 14 Bolt

Claims (2)

ロッド本体とキャップとから成るエンジン用コンロッドであって、ロッド本体とキャップとが一体化した形状に成形したコンロッド素材にロッド本体側のねじ孔とねじ孔からキャップ側にのびるボルト挿通孔とから成るキャップ用の結合孔を形成し、コンロッド素材を分割して得られたロッド本体とキャップとをボルト挿通孔を通してねじ孔に螺合させるボルトにより締結するものにおいて、ボルト挿通孔を、キャップの外面寄りの大径部と、大径部に対しキャップ内の段差部を存してねじ孔側にのびる小径部とを有する段付孔に形成し、小径部をキャップとロッド本体とに亘って形成するとともに、小径部の径を、ボルトの外径より大きくねじ孔の谷径より小さくする、ことを特徴とするエンジン用コンロッド。A connecting rod for an engine comprising a rod body and a cap, comprising a rod hole on the rod body side and a bolt insertion hole extending from the screw hole to the cap side in a connecting rod material formed into an integrated shape of the rod body and the cap. A bolt hole is formed near the outer surface of the cap by forming a coupling hole for the cap and fastening the rod body obtained by dividing the connecting rod material and the cap with a bolt that is screwed into the screw hole through the bolt insertion hole. And a stepped hole having a stepped portion in the cap with respect to the large diameter portion and a small diameter portion extending to the screw hole side, and the small diameter portion is formed across the cap and the rod body. In addition, the connecting rod for an engine is characterized in that the diameter of the small diameter portion is larger than the outer diameter of the bolt and smaller than the valley diameter of the screw hole. ロッド本体とキャップとから成るエンジン用コンロッドの製造方法であって、
ロッド本体とキャップとが一体化した形状のコンロッド素材を成形する工程と、
ロッド本体側のねじ孔とねじ孔からキャップ側にのびるボルト挿通孔とから成るキャップ用の結合孔を形成する工程と、
コンロッド素材をロッド本体とキャップとに分割する工程と、
ロッド本体とキャップとの分割面の微小突起を除去する工程と、
ロッド本体とキャップとをボルト挿通孔を通してねじ孔に螺合させるボルトにより締結する工程とを備え、
ボルト挿通孔を、キャップの外面寄りの大径部と、大径部に対しキャップ内の段差部を存してねじ孔側にのびる小径部とを有する段付孔に形成し、小径部をキャップとロッド本体とに亘って形成するとともに、小径部の径を、ボルトの外径より大きくねじ孔の谷径より小さくすることを特徴とするエンジン用コンロッドの製造方法。A method for manufacturing a connecting rod for an engine comprising a rod body and a cap,
Forming a connecting rod material having a shape in which the rod body and the cap are integrated;
Forming a cap coupling hole comprising a screw hole on the rod body side and a bolt insertion hole extending from the screw hole to the cap side;
Dividing the connecting rod material into a rod body and a cap;
Removing the minute protrusions on the split surface between the rod body and the cap;
Fastening the rod body and the cap with a bolt screwed into the screw hole through the bolt insertion hole,
The bolt insertion hole is formed in a stepped hole having a large diameter portion near the outer surface of the cap and a small diameter portion extending to the screw hole side with a step portion in the cap with respect to the large diameter portion. And a rod main body, and the diameter of the small diameter portion is larger than the outer diameter of the bolt and smaller than the valley diameter of the screw hole.
JP17110999A 1999-06-17 1999-06-17 Connecting rod for engine and manufacturing method thereof Expired - Fee Related JP4146578B2 (en)

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JP17110999A JP4146578B2 (en) 1999-06-17 1999-06-17 Connecting rod for engine and manufacturing method thereof
US09/584,387 US6427326B1 (en) 1999-06-17 2000-06-01 Method of manufacturing connecting rod

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JP17110999A JP4146578B2 (en) 1999-06-17 1999-06-17 Connecting rod for engine and manufacturing method thereof

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KR100498571B1 (en) * 2003-05-21 2005-07-01 한국항공우주산업 주식회사 Connecting apparatus for rod-end bearing
US7581315B2 (en) * 2004-11-16 2009-09-01 Mahle Technology, Inc. Connecting rod assembly for an internal combustion engine and method of manufacturing same
US7516546B2 (en) * 2004-11-16 2009-04-14 Mahle Technology, Inc. Method of manufacturing a connecting rod assembly for an internal combustion engine
JP2006308027A (en) * 2005-04-28 2006-11-09 Yamaha Motor Co Ltd Connecting rod, manufacturing method thereof, internal combustion engine, automobile
CN105851190A (en) * 2016-04-27 2016-08-17 朱彩玲 Connecting rod fixing device of vacuum rolling and rubbing machine

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