JP2002327730A - Connecting bar and connecting bar with bearing - Google Patents

Connecting bar and connecting bar with bearing

Info

Publication number
JP2002327730A
JP2002327730A JP2001133940A JP2001133940A JP2002327730A JP 2002327730 A JP2002327730 A JP 2002327730A JP 2001133940 A JP2001133940 A JP 2001133940A JP 2001133940 A JP2001133940 A JP 2001133940A JP 2002327730 A JP2002327730 A JP 2002327730A
Authority
JP
Japan
Prior art keywords
connecting rod
bearing
fitting hole
outer ring
punching
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001133940A
Other languages
Japanese (ja)
Inventor
Naoki Shibamoto
直樹 柴本
Takayuki Oishi
貴行 大石
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTN Corp
Original Assignee
NTN Corp
NTN Toyo Bearing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NTN Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Priority to JP2001133940A priority Critical patent/JP2002327730A/en
Publication of JP2002327730A publication Critical patent/JP2002327730A/en
Pending legal-status Critical Current

Links

Landscapes

  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a connecting bar which is formed by punching and easily manufactured without subsequent processing of a processed surface, with reduced man-hour and cost. SOLUTION: The connecting bar 1 is formed by punching a steel plate. An outer peripheral surface S1 of the connecting bar and an inner peripheral surface S2 of a bearing fitting hole 5 are punched surfaces that have a sheared surface (a) and a fractured surface (b). The ratio of the fractured surface (b) in the punched surface is set to 20% or less. Punching works are performed by a fine blanking press.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】この発明は、鋼板の打ち抜き
により形成したエンジン用の連接棒および軸受付き連接
棒に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting rod for an engine and a connecting rod with a bearing formed by punching a steel plate.

【0002】[0002]

【従来の技術】エンジンの連接棒は、一般に、棒鋼材,
板材よりの鍛造、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。また、軽量化を図るには、
軸部に開口または薄肉部を設けることになる。
2. Description of the Related Art Connecting rods of engines are generally made of steel bars,
It is manufactured by forging, sintering, or constrained pressure molding from a plate material. In addition, it may be formed by punching by pressing a steel plate. Also, to reduce the weight,
An opening or a thin portion is provided in the shaft portion.

【0003】[0003]

【発明が解決しようとする課題】連接棒を鍛造や焼結で
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。また、連接棒に穴等の加工を行う場合、研削等を
行うので、さらに工数が増えてしまう。プレス加工によ
る打ち抜き形成の場合は、破断面を無くすことが困難で
ある。そのため、打ち抜き形成された連接棒は、大端
部,小端部の内径面に、軸受を圧入するための研削や研
磨の後加工が必要となり、コスト高となる。打ち抜き形
成の場合、大端部,小端部の内径面は、せん断加工の特
性からテーパ状となってしまうが、テーパ状であると、
軸受を圧入した際に軸受の外輪が倣い変形してその転走
面がテーパ状となる。そのため軸受の使用環境が厳しく
なり、短寿命となってしまう。
When the connecting rod is manufactured by forging or sintering, it is difficult to reduce the cost because of the large number of steps. Further, when a hole or the like is machined in the connecting rod, grinding or the like is performed, so that the number of steps is further increased. In the case of punch forming by press working, it is difficult to eliminate a fractured surface. For this reason, the connecting rod formed by stamping requires post-processing such as grinding or polishing for press-fitting the bearing into the inner diameter surfaces of the large end and the small end, which increases the cost. In the case of punching, the inner diameter surfaces of the large end and the small end are tapered due to the characteristics of the shearing process.
When the bearing is press-fitted, the outer ring of the bearing follows and deforms, and its rolling surface becomes tapered. Therefore, the use environment of the bearing becomes severe, and the life is shortened.

【0004】この発明の目的は、打ち抜きにより形成で
き、加工面の後加工が必要でなく、製造が簡単で、工
数、コストが削減できる連接棒を提供することである。
この発明の他の目的は、軽量化を図ることである。この
発明のさらに他の目的は、連接棒の製造が簡単で、工
数、コストが削減されるうえ、軸受嵌合穴のテーパ形状
による軸受の短寿命化が避けられ、また連接棒の使用機
器に対する組立性に優れた軸受付き連接棒を提供するこ
とである。
An object of the present invention is to provide a connecting rod which can be formed by punching, does not require post-processing of a processing surface, is easy to manufacture, and can reduce man-hours and costs.
Another object of the present invention is to reduce the weight. Still another object of the present invention is to simplify the manufacturing of the connecting rod, reduce man-hours and costs, avoid the shortening of the life of the bearing due to the tapered shape of the bearing fitting hole, and reduce the use of the connecting rod to equipment. An object of the present invention is to provide a connecting rod with a bearing having excellent assemblability.

【0005】[0005]

【課題を解決するための手段】この発明の連接棒は、軸
部の両端に大端部と小端部を有し、これら大端部および
小端部に軸受嵌合穴を設けた連接棒において、1枚の鋼
板から形成され、上記軸受嵌合穴の内周面が打ち抜き加
工面であって、せん断面と破断面を有し、上記軸受嵌合
穴の内周面における破断面が占める割合が20%以下で
あることを特徴とする。この構成によると、軸受嵌合穴
の内周面における破断面が占める割合が20%以下であ
るため、打ち抜き加工面でありながら、加工面が綺麗で
精度が良い。そのため、後加工を施すことなく、軸受嵌
合穴に軸受を圧入等により嵌合させることができる。破
断面が20%以下となる打ち抜き加工は、例えばファイ
ンブランキングプレス(精密打ち抜きとも呼ばれる)に
よって実現できる。このように、打ち抜き加工で形成で
きて、研削や研磨等の後加工も必要でないため、製造が
簡単で、工数、コストが削減できる。なお、破断面が占
める割合は、少ないほど良いが、打ち抜き加工によると
零とはならず、破断面が残る。
SUMMARY OF THE INVENTION A connecting rod according to the present invention has a large end and a small end at both ends of a shaft, and a bearing fitting hole is provided at each of the large end and the small end. Wherein the inner peripheral surface of the bearing fitting hole is a punched surface, has a shear surface and a fractured surface, and is occupied by the fractured surface in the inner peripheral surface of the bearing fitting hole. The ratio is not more than 20%. According to this configuration, the ratio of the fractured surface to the inner peripheral surface of the bearing fitting hole is 20% or less, so that the processed surface is clean and has high accuracy while being a punched surface. Therefore, the bearing can be fitted into the bearing fitting hole by press fitting or the like without performing post-processing. The punching process in which the fracture surface is 20% or less can be realized by, for example, a fine blanking press (also called precision punching). As described above, since it can be formed by the punching process, and post-processing such as grinding and polishing is not required, the manufacturing is simple, and the number of steps and cost can be reduced. The smaller the ratio of the fractured surface, the better, but it does not become zero by punching, and the fractured surface remains.

【0006】この発明の連接棒において、連接棒外周面
が打ち抜き加工面であって、せん断面と破断面を有する
ものとしても良い。その場合に、連接棒外周面における
破断面が占める割合を20%以下とすることが好まし
い。このように、連接棒外周面を打ち抜き加工面とする
と、連接棒の外周形状および軸受嵌合穴の加工が共に打
ち抜き加工で行え、同時に打ち抜くこともでき、生産性
がより向上する。また、連接棒外周面における破断面の
占める割合が20%以下であると、連接棒外周面の形状
が綺麗であり、連接棒の品質が向上する。
[0006] In the connecting rod of the present invention, the outer peripheral surface of the connecting rod may be a punched surface and have a shear surface and a fractured surface. In this case, it is preferable that the proportion occupied by the fracture surface on the outer peripheral surface of the connecting rod is 20% or less. As described above, when the outer peripheral surface of the connecting rod is a punched surface, both the outer peripheral shape of the connecting rod and the processing of the bearing fitting hole can be performed by punching, and punching can be performed at the same time. Further, when the ratio of the fractured surface to the outer peripheral surface of the connecting rod is 20% or less, the shape of the outer peripheral surface of the connecting rod is beautiful, and the quality of the connecting rod is improved.

【0007】この発明の連接棒は、上記軸部に凹所また
は穴を有するものであっても良い。このように軸部に凹
所または穴を設けることにより、軽量化が行える。この
凹所や穴の加工も、ファインブランキングプレスによっ
て加工できる。
The connecting rod of the present invention may have a recess or a hole in the shaft. By providing the recess or the hole in the shaft portion in this way, the weight can be reduced. The processing of the recesses and holes can also be performed by a fine blanking press.

【0008】この発明の軸受付き連接棒は、この発明の
上記いずれかの構成の連接棒と、この連接棒の軸受嵌合
穴に嵌合したころ軸受とからなる。上記ころ軸受は、円
筒面状の転走面を有する外輪と、この外輪に収容される
複数のころとを有し、前記転走面が所定の円筒度の範囲
に規制されているものとする。ファインブランキングプ
レスは、その打ち抜き加工面の広範囲に綺麗なせん断面
が得られるが、軸受嵌合穴は若干テーパ状となる。この
ようなテーパ状の軸受嵌合穴に通常のシェル型ころ軸受
を圧入すると、外輪はテーパ形状の穴に倣って転走面が
テーパ状となる。このため、径が小さい側でのみころを
支持することになって軸受の寿命が短くなる。これに対
して、転走面を所定の円筒度の範囲に規制することよ
り、軸受の短寿命化が避けられる。なお、ファインブラ
ンキングプレス以外の加工により、軸受嵌合穴がテーパ
状とは異なる形状となっている場合であっても、転走面
を所定の円筒度の範囲に規制することにより軸受の短寿
命化が避けられる。
[0008] A connecting rod with a bearing according to the present invention comprises the connecting rod having any one of the above structures according to the present invention, and a roller bearing fitted into a bearing fitting hole of the connecting rod. The roller bearing has an outer ring having a cylindrical rolling surface and a plurality of rollers housed in the outer ring, and the rolling surface is restricted to a predetermined cylindricity range. . In the fine blanking press, a clear shearing surface can be obtained over a wide range of the punched surface, but the bearing fitting hole is slightly tapered. When a normal shell type roller bearing is press-fitted into such a tapered bearing fitting hole, the rolling surface of the outer ring becomes tapered following the tapered hole. For this reason, the rollers are supported on the smaller diameter side, and the life of the bearing is shortened. On the other hand, shortening the life of the bearing can be avoided by regulating the rolling surface to a predetermined cylindricity range. Even if the bearing fitting hole is formed in a shape different from the tapered shape by processing other than the fine blanking press, the bearing surface can be shortened by regulating the rolling surface to a predetermined cylindricity range. Life extension can be avoided.

【0009】この発明の軸受付き連接棒において、上記
ころ軸受の外輪は、上記連接棒の上記軸受嵌合穴のテー
パ形状に対応して径方向厚さが軸方向に沿って漸次変化
するものであっても良い。このように、外輪の径方向厚
さを漸次変化させることにより、連接棒の軸受嵌合穴の
テーパ形状が相殺され、転走面の円筒度が確保される。
したがって、ころの荷重が軸方向の全長にわたって均一
化され、長寿命となる。
In the connecting rod with bearing according to the present invention, the outer ring of the roller bearing has a radial thickness gradually changing along the axial direction corresponding to the tapered shape of the bearing fitting hole of the connecting rod. There may be. As described above, by gradually changing the radial thickness of the outer ring, the tapered shape of the bearing fitting hole of the connecting rod is canceled, and the cylindricity of the rolling surface is secured.
Therefore, the load of the rollers is made uniform over the entire length in the axial direction, and the life is extended.

【0010】この発明の軸受付き連接棒において、上記
ころ軸受の外輪は、径方向厚さが軸方向に沿って均一で
あって、上記所定の円筒度が得られる径方向厚さを有す
るものであっても良い。外輪の径方向厚さを厚くする
と、外輪が連接棒の軸受嵌合穴のテーパ形状にならわ
ず、転走面の円筒度が確保される。外輪が厚さ一定のも
ので良いため、外輪の製造が容易である。
[0010] In the connecting rod with bearing of the present invention, the outer race of the roller bearing has a radial thickness that is uniform in an axial direction and has a radial thickness that allows the predetermined cylindricity to be obtained. There may be. When the radial thickness of the outer ring is increased, the outer ring does not follow the tapered shape of the bearing fitting hole of the connecting rod, and the cylindricity of the rolling surface is ensured. Since the outer ring may have a constant thickness, manufacture of the outer ring is easy.

【0011】この発明の軸受付き連接棒において、上記
所定の円筒度は0.01mm以下であっても良い。円筒度
が0.01mm以下という精度は、軸受の転走面の精度と
して一般的な値であり、この精度を確保することで、通
常の転がり寿命を得ることができる。
In the connecting rod with bearing of the present invention, the predetermined cylindricity may be 0.01 mm or less. The accuracy of the cylindricity of 0.01 mm or less is a general value as the accuracy of the rolling surface of the bearing. By ensuring this accuracy, a normal rolling life can be obtained.

【0012】[0012]

【発明の実施の形態】この発明の第1の実施形態を図
1,図2と共に説明する。この連接棒1は、軸部2の両
端に円形の大端部3と小端部4を有し、これら大端部3
および小端部4に軸受嵌合穴5を設けたものである。軸
受嵌合穴5は円筒穴とされる。この連接棒1は、1枚の
鋼板から打ち抜き形成されたものであり、連接棒外周面
S1および嵌合穴5の内周面S2が打ち抜き加工面とさ
れる。この打ち抜き加工はファインブランキングプレス
により行われる。連接棒外周面S1は、連接棒1の全体
の外周の端面のことであり、軸部2の両側面と、大端部
3および小端部4の外周面とからなる。これら連接棒外
周面S1および嵌合穴5の内周面S2である打ち抜き加
工面は、図1(B)に拡大して示すように、せん断面a
と破断面bを有し、連接棒外周面S1および軸受嵌合穴
5の内周面S2における破断面bが占める割合が、いず
れも20%以下である。ファインブランキングプレスに
よる場合、詳しくは、打ち抜き加工面は、ポンチ進入側
から順に、だれ部c、一次せん断面a1、破断面b、お
よび二次せん断面a2が順に続き、ポンチ通り抜け側の
縁に返り部dが生じる。また、打ち抜き加工面は、二次
せん断面dの部分において、ポンチ通り抜け側が広がる
傾斜角度θが生じ、テーパ状となる。この傾斜角度θは
破壊角となる。打ち抜き加工面における一次せん断面a
1の部分も、二次せん断面a2の傾斜角度θよりは緩や
かであるが、ポンチ通り抜け側が広がる傾斜角度(図示
せず)を生じ、テーパ面となる。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. This connecting rod 1 has a circular large end 3 and a small end 4 at both ends of a shaft portion 2.
And a bearing fitting hole 5 provided in the small end portion 4. The bearing fitting hole 5 is a cylindrical hole. The connecting rod 1 is formed by punching a single steel plate, and the outer peripheral surface S1 of the connecting rod and the inner peripheral surface S2 of the fitting hole 5 are punched surfaces. This punching is performed by a fine blanking press. The connecting rod outer peripheral surface S1 is an end surface of the entire outer periphery of the connecting rod 1 and includes both side surfaces of the shaft portion 2 and outer peripheral surfaces of the large end portion 3 and the small end portion 4. The punched surfaces, which are the outer peripheral surface S1 of the connecting rod and the inner peripheral surface S2 of the fitting hole 5, have a shear plane a as shown in FIG.
The ratio of the fracture surface b in the connecting rod outer peripheral surface S1 and the inner peripheral surface S2 of the bearing fitting hole 5 is 20% or less. In the case of using the fine blanking press, in detail, the punching processing surface includes, in order from the punch entry side, a droop portion c, a primary shearing surface a1, a fractured surface b, and a secondary shearing surface a2. A return portion d occurs. In addition, the punched surface has a tapered shape in which the punch-through side has an inclined angle θ that widens at the secondary shear surface d. This inclination angle θ is a breaking angle. Primary shear plane a in punched surface
The portion 1 is also gentler than the inclination angle θ of the secondary shear surface a2, but has an inclination angle (not shown) in which the punch-through side expands, and becomes a tapered surface.

【0013】この連接棒1の製造方法を説明する。この
連接棒1は、鋼板をファインブランキングプレスにより
打ち抜くことによって、軸部2の両端に円形の大端部3
と小端部4を有し、これら大端部2および小端部3に軸
受嵌合穴5を有する形状とする。連接棒1の外周の打ち
抜きと軸受嵌合穴5の打ち抜きとは同時に行うが、外周
を打ち抜いた後に軸受嵌合穴5を打ち抜いても、また軸
受嵌合穴5を打ち抜いた後に外周を打ち抜いても良い。
打ち抜き後は、連接棒1の熱処理や、大端部2、小端部
3の軸受嵌合穴5の後加工は行わない。なお、要求仕様
によっては、連接棒1の外周は、通常の打ち抜き加工と
し、軸受嵌合穴5をファインブランキングプレスで加工
しても良い。ファインブランキングプレスは、打ち抜き
される材料の、せん断部分における材料流れの制御を行
って打ち抜く方法であり、精密打ち抜きとも呼ばれる。
通常の打ち抜き加工では、約50%程度のせん断面が形
成されるが、ファインブランキングプレスによると、打
ち抜き加工面における破断面bが占める割合が20%以
下となる。連接棒1の材料となる鋼板の材質には、冷間
圧延鋼板(SPCC等)、炭素鋼帯鋼(SPHC等)、
機械構造用炭素鋼(S16C,S22C〜S35C
等)、クロムモリブデン鋼(SCM等)等が使用できる
が、ファインブランキングプレスは延性材ほど効果があ
り、先に述べた材質で最良なのは冷間圧延鋼板(SPC
C)、炭素鋼帯鋼(SPHC)、機械構造用炭素鋼(S
16C)である。
A method of manufacturing the connecting rod 1 will be described. The connecting rod 1 is formed by punching a steel plate by a fine blanking press to form a circular large end 3 at both ends of the shaft 2.
And a small end portion 4. The large end portion 2 and the small end portion 3 have a bearing fitting hole 5. The punching of the outer periphery of the connecting rod 1 and the punching of the bearing fitting hole 5 are performed at the same time. However, the punching of the bearing fitting hole 5 after the punching of the outer circumference or the punching of the outer circumference after punching the bearing fitting hole 5 is also possible. Is also good.
After the punching, heat treatment of the connecting rod 1 and post-processing of the bearing fitting holes 5 at the large end 2 and the small end 3 are not performed. Depending on the required specifications, the outer periphery of the connecting rod 1 may be formed by ordinary punching, and the bearing fitting hole 5 may be formed by a fine blanking press. The fine blanking press is a method of performing punching by controlling the flow of material in a shearing portion of the material to be punched, and is also called precision punching.
In ordinary punching, a shear surface of about 50% is formed, but according to the fine blanking press, the ratio of the fractured surface b in the punched surface is 20% or less. Examples of the material of the steel plate used as the material of the connecting rod 1 include a cold-rolled steel plate (such as SPCC), a carbon steel strip (such as SPHC),
Carbon steel for machine structure (S16C, S22C-S35C
Etc.) and chromium molybdenum steel (SCM etc.) can be used, but the fine blanking press is more effective for ductile materials, and the best material mentioned above is the cold rolled steel plate (SPC
C), carbon steel strip (SPHC), carbon steel for machine structures (S
16C).

【0014】図2は、ファインブランキングプレスを概
念的に示す説明図である。ファインブランキングプレス
は、ナイフエッジ状の突起13aを有する板押え13
と、逆押え14と、クリアランスの極度に小さいパンチ
11およびダイ12とにより、材料Wの内部に高い圧縮
応力を生じさせ、材料Wの延性を高めて割れの発生を防
ぎ、破断のない美しいせん断面を得る方法である。ま
ず、板押え13の突起13aが、打ち抜かれる輪郭近く
の材料表面に押し込まれる(同図(A))。ついで、突
起13aで材料Wをダイ12の上に押付け固定し、逆押
え14も同時に作動させ、打ち抜きが開始される(同図
(B))。ポンチ11の押し込みが進むことにより、せ
ん断加工が進む。加工中は常に逆押さえ14で平らに押
しているので、曲げ変形が防止される。なお、パンチ1
1とダイ12のクリアランスは、例えば板厚の3〜5%
とされる。
FIG. 2 is an explanatory view conceptually showing a fine blanking press. The fine blanking press is a plate holder 13 having a knife-edge-shaped projection 13a.
, The back presser 14 and the punch 11 and the die 12 having extremely small clearances, generate a high compressive stress inside the material W, enhance the ductility of the material W, prevent cracks from occurring, and provide beautiful breakage without breakage. This is a method of obtaining a cross section. First, the projection 13a of the plate retainer 13 is pressed into the surface of the material near the contour to be punched (FIG. 3A). Then, the material W is pressed and fixed on the die 12 by the projections 13a, and the reverse presser 14 is simultaneously operated to start punching (FIG. 2B). As the pushing of the punch 11 proceeds, the shearing process proceeds. During the processing, since it is always pressed flat by the reverse presser 14, bending deformation is prevented. In addition, punch 1
The clearance between the die 1 and the die 12 is, for example, 3 to 5% of the plate thickness.
It is said.

【0015】この構成の連接棒1によると、連接棒外周
面S1および軸受嵌合穴5の内周面S2における破断面
bの占める割合がいずれも20%以下であるため、打ち
抜き加工面Sでありながら、加工面が綺麗で精度が良
い。そのため、後加工を施すことなく、軸受嵌合穴5に
軸受(図示せず)を圧入等により嵌合させることができ
る。このように、打ち抜き加工で形成できて、後加工も
必要でないため、製造が簡単で、工数、コストが削減で
きる。
According to the connecting rod 1 of this construction, the ratio of the fractured surface b to the outer peripheral surface S1 of the connecting rod and the inner peripheral surface S2 of the bearing fitting hole 5 is not more than 20%. Despite this, the machined surface is clean and accurate. Therefore, a bearing (not shown) can be fitted into the bearing fitting hole 5 by press-fitting or the like without performing post-processing. As described above, since it can be formed by punching and no post-processing is required, the manufacturing is simple, and the number of steps and cost can be reduced.

【0016】図3〜図7は、この発明の他の実施形態に
かかる連接棒1A、およびその連接棒1Aを用いた軸受
付き連接棒10(図5)を示す。この連接棒1Aは、第
1の実施形態にかかる連接棒1において、軸部2に軽量
化のための凹所6および穴7を設けたものである。凹所
6は、軸部2の軸方向に沿う溝状のものとされ、軸部2
の略全長に渡って延びている。また、凹所6は軸部2の
表裏両面に設けられている。穴7は凹所6内に設けら
れ、表裏に貫通している。穴7は、軸部2の軸方向に離
れた複数箇所に設けられている。このように凹所6や穴
7を設けることで、連接棒1Aの軽量化が実現される。
これら凹所6および穴7は、ファインブランキングプレ
スにより形成する。この凹所6および穴7の成形は、連
接棒1Aの外周および軸受嵌合穴5のファインブランキ
ングプレスによる打ち抜き加工と同時に行うことが好ま
しく、これにより工数の削減となる。
FIGS. 3 to 7 show a connecting rod 1A according to another embodiment of the present invention, and a connecting rod 10 with a bearing using the connecting rod 1A (FIG. 5). This connecting rod 1A is different from the connecting rod 1 according to the first embodiment in that the shaft portion 2 is provided with a recess 6 and a hole 7 for reducing the weight. The recess 6 is formed in a groove shape along the axial direction of the shaft portion 2.
Extends over substantially the entire length of the. The recesses 6 are provided on both front and back surfaces of the shaft portion 2. The hole 7 is provided in the recess 6 and penetrates the front and back. The holes 7 are provided at a plurality of positions separated in the axial direction of the shaft portion 2. By providing the recesses 6 and the holes 7 in this way, the weight of the connecting rod 1A can be reduced.
These recesses 6 and holes 7 are formed by a fine blanking press. The recess 6 and the hole 7 are preferably formed at the same time as the punching of the outer periphery of the connecting rod 1A and the bearing fitting hole 5 by a fine blanking press, thereby reducing the number of steps.

【0017】図5に示すように、この軸受付き連接棒1
0は、上記の連接棒1Aにおける大端部3および小端部
4の軸受嵌合穴5に、ころ軸受20を嵌合させたもので
ある。ころ軸受20は、円筒面状の転走面21aを有す
る外輪21と、この外輪21に収容される複数のころ2
2とを有し、これら複数のころ22は環状の保持器23
のポケット内に保持されている。ころ22の長さLは、
連接棒1Aの厚さB以下としている。外輪21は、鋼材
の削り出し品からなる。連接棒1Aの軸受嵌合穴5は、
ファインブランキングプレスによる加工によって、図6
に誇張して示すように若干テーパ形状となっているが、
外輪12の転走面21aは、所定の円筒度の範囲に規制
している。円筒度は、本来あるべき幾何学的円筒面から
の最大のラジアル距離で示される値であり、所定の円筒
度は、0.01mm以下としている。上記所定の円筒度
は、好ましくは0.005mm以下である。
As shown in FIG. 5, this connecting rod with bearing 1
Numeral 0 indicates that the roller bearing 20 is fitted in the bearing fitting holes 5 of the large end 3 and the small end 4 of the connecting rod 1A. The roller bearing 20 includes an outer ring 21 having a cylindrical rolling surface 21a, and a plurality of rollers 2 housed in the outer ring 21.
2, and the plurality of rollers 22 are annular retainers 23.
Is held in a pocket. The length L of the roller 22 is
The thickness is less than or equal to the thickness B of the connecting rod 1A. The outer ring 21 is made of a machined steel product. The bearing fitting hole 5 of the connecting rod 1A is
Fig. 6
It has a slightly tapered shape as shown exaggeratedly,
The rolling surface 21a of the outer race 12 is restricted to a predetermined cylindricity range. The cylindricity is a value indicated by a maximum radial distance from an original geometric cylindrical surface, and the predetermined cylindricity is 0.01 mm or less. The predetermined cylindricity is preferably 0.005 mm or less.

【0018】この実施形態では、外輪21を、連接棒1
Aの軸受嵌合穴5のテーパ形状に対応して、図7に示す
ように径方向厚さtが軸方向に沿って漸次変化するもの
としている。図7の例では、外輪21は、単独の状態に
おいて、外径面21bがテーパ面となり、転走面21a
となる内径面が円筒面となる形状とされ、これにより径
方向厚さtが漸次変化するものとされている。
In this embodiment, the outer ring 21 is connected to the connecting rod 1.
In correspondence with the tapered shape of the bearing fitting hole 5 of A, the radial thickness t gradually changes along the axial direction as shown in FIG. In the example of FIG. 7, the outer ring 21 has a tapered outer diameter surface 21b and a rolling surface 21a in a single state.
Is formed into a cylindrical surface, whereby the radial thickness t is gradually changed.

【0019】この実施形態の作用を説明する。ファイン
ブランキングプレスは、その打ち抜き加工面に美しいせ
ん断面を得ることができるが、連接棒1Aの軸受嵌合穴
5が上記のように若干テーパ状となる。例えば、厚さ
4.8mmの連接棒1Aに直径12mm、または14mmの軸
受嵌合穴5を設けたときに、穴5の両端で約20μmの
径差のテーパ状となる。このテーパ状の軸受嵌合穴5に
通常のシェル型の軸受(図示せず)を圧入したとする
と、外輪はテーパ形状の軸受嵌合穴5に倣って、径が小
さい側でのみころを支持することになり、軸受の寿命が
短くなってしまう。この問題を解消するために、図7の
例のように、外輪21を径方向厚さtが漸次変化すると
している。これにより、軸受嵌合穴5のテーパ形状が相
殺され、転走面21aの円筒度が確保される。したがっ
て、ころ22の荷重が軸方向の全長にわたって均一化さ
れ、長寿命となる。
The operation of this embodiment will be described. The fine blanking press can obtain a beautiful shearing surface on the punched surface, but the bearing fitting hole 5 of the connecting rod 1A is slightly tapered as described above. For example, when a connecting rod 1A having a thickness of 4.8 mm is provided with a bearing fitting hole 5 having a diameter of 12 mm or 14 mm, a tapered shape having a diameter difference of about 20 μm is formed at both ends of the hole 5. Assuming that a normal shell-type bearing (not shown) is press-fitted into the tapered bearing fitting hole 5, the outer ring follows the tapered bearing fitting hole 5 and supports the rollers on the smaller diameter side. As a result, the life of the bearing is shortened. To solve this problem, the thickness t of the outer ring 21 in the radial direction is gradually changed as in the example of FIG. Thereby, the tapered shape of the bearing fitting hole 5 is canceled, and the cylindricity of the rolling surface 21a is ensured. Therefore, the load of the rollers 22 is made uniform over the entire length in the axial direction, and the life is extended.

【0020】なお、この実施形態では、外輪21は外径
面がテーパ面となる形状としたが、図8に示すように、
外輪21の転走面21aとなる内径面を、外輪21の単
独状態でテーパ面となるようにすることで、外輪21の
径方向厚さtが漸次変化するようにしても良い。この場
合、外輪21の外径面は円筒面である。このように外輪
21の内径面をテーパ面としても、連接棒1Aの軸受嵌
合穴5に圧入すると、外輪21が軸受嵌合穴5のテーパ
形状に倣って変形することにより、内径面の転走面21
aが円筒面となる。
In this embodiment, the outer race 21 has a shape in which the outer diameter surface is a tapered surface. However, as shown in FIG.
The radial thickness t of the outer ring 21 may be gradually changed by making the inner diameter surface serving as the rolling surface 21a of the outer ring 21 a tapered surface when the outer ring 21 is alone. In this case, the outer diameter surface of the outer ring 21 is a cylindrical surface. Thus, even if the inner diameter surface of the outer ring 21 is formed into a tapered surface, when the outer ring 21 is pressed into the bearing fitting hole 5 of the connecting rod 1A, the outer ring 21 is deformed in accordance with the tapered shape of the bearing fitting hole 5 so that the inner diameter surface is rolled. Running surface 21
a becomes a cylindrical surface.

【0021】また、図7,図8の実施形態では軸受20
の外輪21を削り出し品としたが、これら図7,図8の
軸受20に代えて、図9に示すように、外輪21Aをシ
ェル型としたころ軸受20、つまり外輪21Aが鋼板の
プレス成形品からなる軸受を用いても良い。外輪21A
は両鍔付きのものとしてある。このシェル型の外輪21
Aは、板厚となる径方向厚さtが、軸方向に漸次変化す
るものとしている。シェル型とする場合も、外輪21A
は外周面および内周面のいずれをテーパ面として径方向
厚さtが変化するものとしても良い。
In the embodiment shown in FIGS.
The outer ring 21 of FIG. 7 is machined, but instead of the bearings 20 of FIGS. 7 and 8, as shown in FIG. 9, the outer ring 21A is a shell type roller bearing 20, that is, the outer ring 21A is formed of a steel plate by press forming. A bearing made of a product may be used. Outer ring 21A
Is with both collars. This shell type outer ring 21
A indicates that the radial thickness t, which is the plate thickness, gradually changes in the axial direction. Even in the case of a shell type, the outer ring 21A
Any of the outer peripheral surface and the inner peripheral surface may be tapered to change the radial thickness t.

【0022】図10は、この発明のさらに他の実施形態
にかかる軸受付き連接棒10を示す。この軸受付き連接
棒10は、ころ軸受20の外輪21を、径方向厚さtが
軸方向に沿って均一であって、上記所定の円筒度が得ら
れる径方向厚さtを有するものとしている。所定の円筒
度は、前記のように0.01mm以下である。その他の構
成は、図3ないし図7に示す実施形態と同じである。外
輪21の厚さが薄い場合は、図11のように外輪21の
外径面が連接棒1Aの軸受嵌合穴5の内径面に完全にな
らうため、均一厚さの外輪21では、内径面の転走面2
1aがテーパ面となる。しかし、外輪21の厚さtがあ
る程度厚い場合は、図10のように、外輪21の外径面
は軸受嵌合穴5の内径面に倣わず、転走面21aの円筒
度が確保される。外輪21の厚さtをどの程度の厚さと
するかは、各種の条件によって異なるが、外輪21を軸
受嵌合穴5に圧入した状態で、外輪21の円筒度が0.
01mm以下に確保される厚さとする。
FIG. 10 shows a connecting rod 10 with a bearing according to still another embodiment of the present invention. In the connecting rod 10 with a bearing, the outer race 21 of the roller bearing 20 has a radial thickness t that is uniform along the axial direction and has a radial thickness t that allows the above-described predetermined cylindricity to be obtained. . The predetermined cylindricity is 0.01 mm or less as described above. Other configurations are the same as those of the embodiment shown in FIGS. When the thickness of the outer ring 21 is small, the outer diameter surface of the outer ring 21 completely conforms to the inner diameter surface of the bearing fitting hole 5 of the connecting rod 1A as shown in FIG. Surface rolling surface 2
1a is a tapered surface. However, when the thickness t of the outer ring 21 is somewhat large, the outer diameter surface of the outer ring 21 does not follow the inner diameter surface of the bearing fitting hole 5 as shown in FIG. You. The thickness t of the outer ring 21 depends on various conditions. However, when the outer ring 21 has a cylindricity of 0.
The thickness shall be ensured to be 01 mm or less.

【0023】[0023]

【発明の効果】この発明の連接棒は、1枚の鋼板から形
成され、軸受嵌合穴の内周面が打ち抜き加工面であっ
て、せん断面と破断面を有し、上記軸受嵌合穴の内周面
における破断面の占める割合が20%以下であるため、
打ち抜きにより形成できて、加工面の後加工が不要で、
製造が簡単であり、工数、コストが削減される。連接棒
外周面が打ち抜き加工面であって、せん断面と破断面を
有し、連接棒外周面における破断面が占める割合が20
%以下である場合は、連接棒外周面および軸受嵌合穴が
共に打ち抜きにより形成できて、生産性がより向上する
うえ、連接棒外周面の形状が通常の打ち抜き加工の場合
に比べて綺麗であり、連接棒の品質が向上する。上記軸
部に凹所または穴を有する場合は、軽量化が実現でき
る。この発明の軸受付き連接棒は、この発明の連接棒
と、この連接棒の軸受嵌合穴に嵌合したころ軸受とから
なり、上記ころ軸受は、円筒面状の転走面を有する外輪
と、この外輪に収容される複数のころとを有し、前記転
走面が所定の円筒度の範囲に規制されているため、連接
棒の製造が簡単で、工数、コストが削減されるうえ、軸
受嵌合穴のテーパ形状による軸受の短寿命化が避けられ
る。また、連接棒と軸受とが予め組まれた組立部品とさ
れるため、連接棒の使用機器に対する組立性が良い。上
記ころ軸受の外輪が、上記連接棒の上記軸受嵌合穴のテ
ーパ形状に対応して径方向厚さが軸方向に沿って漸次変
化するものである場合は、軸受嵌合穴のテーパ形状と外
輪の径方向厚さの変化とが相殺されて、転走面の円筒度
が確保され、軸受嵌合穴のテーパ形状による軸受の短寿
命化が避けられる。上記ころ軸受の外輪が、径方向厚さ
が軸方向に沿って均一であって、上記所定の円筒度が得
られる径方向厚さを有するものである場合も、軸受嵌合
穴のテーパ形状による軸受の短寿命化が避けられ、また
外輪が一定厚さのもので良いため、外輪の製造が容易で
ある。上記所定の円筒度が0.01mm以下である場合
は、軸受嵌合穴のテーパ形状にかかわらず、一般的な軸
受寿命が確保される。
The connecting rod of the present invention is formed from a single steel plate, the inner peripheral surface of the bearing fitting hole is a punched surface, has a shear surface and a fractured surface, and has a bearing surface. Since the ratio of the fractured surface to the inner peripheral surface of the is less than 20%,
Can be formed by punching, no need for post-processing of the processing surface,
It is easy to manufacture, reducing man-hours and costs. The outer peripheral surface of the connecting rod is a punched surface and has a shear surface and a fractured surface.
% Or less, the outer peripheral surface of the connecting rod and the bearing fitting hole can be formed by punching, whereby the productivity is further improved, and the outer peripheral surface of the connecting rod is more beautiful than in the case of normal punching. Yes, the quality of the connecting rod is improved. When the shaft has a recess or a hole, the weight can be reduced. A connecting rod with a bearing of the present invention comprises a connecting rod of the present invention and a roller bearing fitted in a bearing fitting hole of the connecting rod, wherein the roller bearing has an outer ring having a cylindrical rolling surface. Since a plurality of rollers are accommodated in the outer ring, and the rolling surface is regulated within a predetermined cylindricity range, the manufacturing of the connecting rod is simple, and the number of steps and costs are reduced. It is possible to avoid shortening the life of the bearing due to the tapered shape of the bearing fitting hole. In addition, since the connecting rod and the bearing are assembled in advance, the connecting rod has good assemblability with respect to the equipment to be used. When the outer ring of the roller bearing has a radial thickness that gradually changes along the axial direction corresponding to the tapered shape of the bearing fitting hole of the connecting rod, the tapered shape of the bearing fitting hole is The change in the radial thickness of the outer ring is offset, the cylindricity of the rolling surface is ensured, and the shortening of the life of the bearing due to the tapered shape of the bearing fitting hole can be avoided. Even when the outer ring of the roller bearing has a radial thickness that is uniform along the axial direction and has a radial thickness that allows the predetermined cylindricity to be obtained, the outer ring of the roller bearing depends on the tapered shape of the bearing fitting hole. Since the life of the bearing is not shortened and the outer ring may have a constant thickness, the outer ring can be easily manufactured. When the predetermined cylindricity is 0.01 mm or less, a general bearing life is ensured regardless of the tapered shape of the bearing fitting hole.

【図面の簡単な説明】[Brief description of the drawings]

【図1】(A)はこの発明の一実施形態にかかる連接棒
の斜視図、(B)はその打ち抜き面の拡大説明図であ
る。
FIG. 1A is a perspective view of a connecting rod according to an embodiment of the present invention, and FIG. 1B is an enlarged explanatory view of a punched surface thereof.

【図2】ファインブランキングプレスを概念的に示す工
程図である。
FIG. 2 is a process chart conceptually showing a fine blanking press.

【図3】この発明の他の実施形態にかかる連接棒の正面
図である。
FIG. 3 is a front view of a connecting rod according to another embodiment of the present invention.

【図4】同連接棒の断面図である。FIG. 4 is a sectional view of the connecting rod.

【図5】同連接棒を用いた軸受付き連接棒の断面図であ
る。
FIG. 5 is a sectional view of a connecting rod with a bearing using the connecting rod.

【図6】同連接棒の軸受嵌合穴を示す拡大断面図であ
る。
FIG. 6 is an enlarged sectional view showing a bearing fitting hole of the connecting rod.

【図7】同軸受付き連接棒におけるころ軸受の一例の断
面図である。
FIG. 7 is a sectional view of an example of a roller bearing in the connecting rod with the bearing.

【図8】同軸受付き連接棒におけるころ軸受の他の例の
断面図である。
FIG. 8 is a sectional view of another example of the roller bearing in the connecting rod with the bearing.

【図9】同軸受付き連接棒におけるころ軸受のさらに他
の例の断面図である。
FIG. 9 is a sectional view of still another example of the roller bearing in the connecting rod with the bearing.

【図10】さらに他の実施形態にかかる軸受付き連接棒
の部分断面図である。
FIG. 10 is a partial sectional view of a connecting rod with a bearing according to still another embodiment.

【図11】比較参考例となる軸受付き連接棒の部分断面
図である。
FIG. 11 is a partial cross-sectional view of a connecting rod with a bearing as a comparative reference example.

【符号の説明】[Explanation of symbols]

1…連接棒 1A…連接棒 2…軸部 3…大端部 4…小端部 5…軸受嵌合穴 6…凹所 7…穴 10…軸受付き連接棒 20…ころ軸受 21,21A…外輪 21a…転走面 22…ころ a…せん断面 b…破断面 t…厚さ DESCRIPTION OF SYMBOLS 1 ... Connecting rod 1A ... Connecting rod 2 ... Shaft part 3 ... Large end part 4 ... Small end part 5 ... Bearing fitting hole 6 ... Recess 7 ... Hole 10 ... Connecting rod with bearing 20 ... Roller bearing 21, 21A ... Outer ring 21a: rolling surface 22: roller a: shear surface b: fracture surface t: thickness

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 3J033 AA04 AC01 DA01 3J101 AA13 AA32 AA42 AA62 AA72 BA54 GA22  ──────────────────────────────────────────────────の Continued on the front page F term (reference) 3J033 AA04 AC01 DA01 3J101 AA13 AA32 AA42 AA62 AA72 BA54 GA22

Claims (7)

【特許請求の範囲】[Claims] 【請求項1】 軸部の両端に大端部と小端部を有し、こ
れら大端部および小端部に軸受嵌合穴を設けた連接棒に
おいて、1枚の鋼板から形成され、上記軸受嵌合穴の内
周面が打ち抜き加工面であって、せん断面と破断面を有
し、上記軸受嵌合穴の内周面における破断面が占める割
合が20%以下であることを特徴とする連接棒。
1. A connecting rod having a large end portion and a small end portion at both ends of a shaft portion and having a bearing fitting hole at each of the large end portion and the small end portion. The inner peripheral surface of the bearing fitting hole is a punched surface, has a shear surface and a fracture surface, and the ratio of the fracture surface in the inner peripheral surface of the bearing engagement hole is 20% or less. Connecting rod.
【請求項2】 連接棒外周面が打ち抜き加工面であっ
て、せん断面と破断面を有し、上記連接棒外周面におけ
る破断面が占める割合が20%以下である請求項1に記
載の連接棒
2. The connection according to claim 1, wherein the outer peripheral surface of the connecting rod is a punched surface, has a shear surface and a fracture surface, and a ratio of the fracture surface in the outer peripheral surface of the connecting rod is 20% or less. rod
【請求項3】 上記軸部に凹所または穴を有する請求項
1または請求項2に記載の連接棒。
3. The connecting rod according to claim 1, wherein the shaft has a recess or a hole.
【請求項4】 請求項1ないし請求項3のいずれかに記
載の連接棒と、この連接棒の軸受嵌合穴に嵌合したころ
軸受とからなり、上記ころ軸受は、円筒面状の転走面を
有する外輪と、この外輪に収容される複数のころとを有
し、前記転走面が所定の円筒度の範囲に規制されている
軸受付き連接棒。
4. The connecting rod according to claim 1, further comprising a roller bearing fitted in a bearing fitting hole of the connecting rod, wherein the roller bearing has a cylindrical rolling contact. A connecting rod with a bearing, comprising: an outer ring having a running surface; and a plurality of rollers accommodated in the outer ring, wherein the rolling surface is restricted to a predetermined cylindricity range.
【請求項5】 上記連接棒の軸受嵌合穴がテーパ形状で
あって、上記ころ軸受の外輪は、上記軸受嵌合穴のテー
パ形状に対応して径方向厚さが軸方向に沿って漸次変化
するものである請求項4に記載の軸受付き連接棒。
5. The bearing fitting hole of the connecting rod has a tapered shape, and the outer ring of the roller bearing has a radial thickness gradually increasing along the axial direction corresponding to the tapered shape of the bearing fitting hole. 5. The connecting rod with bearing according to claim 4, which is variable.
【請求項6】 上記ころ軸受の外輪は、径方向厚さが軸
方向に沿って均一であって、上記所定の円筒度が得られ
る径方向厚さを有するものである請求項4に記載の連接
棒および軸受付き連接棒。
6. The roller bearing according to claim 4, wherein the outer race of the roller bearing has a radial thickness that is uniform along an axial direction and has a radial thickness that allows the predetermined cylindricity to be obtained. Connecting rod and connecting rod with bearing.
【請求項7】 上記所定の円筒度が0.01mm以下であ
る請求項3ないし請求項5のいずれかに記載の軸受付き
連接棒。
7. The connecting rod with a bearing according to claim 3, wherein the predetermined cylindricity is 0.01 mm or less.
JP2001133940A 2001-05-01 2001-05-01 Connecting bar and connecting bar with bearing Pending JP2002327730A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001133940A JP2002327730A (en) 2001-05-01 2001-05-01 Connecting bar and connecting bar with bearing

Publications (1)

Publication Number Publication Date
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Family

ID=18981714

Family Applications (1)

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US7281449B2 (en) 2001-11-22 2007-10-16 Ntn Corporation Connecting rod and bearing-equipped connecting rod
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JP2007147037A (en) * 2005-11-30 2007-06-14 Ntn Corp Piston pin supporting structure of engine, crank shaft supporting structure of engine, and two cycle engine
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