JP2009019708A - Split type needle roller bearing - Google Patents

Split type needle roller bearing Download PDF

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Publication number
JP2009019708A
JP2009019708A JP2007183356A JP2007183356A JP2009019708A JP 2009019708 A JP2009019708 A JP 2009019708A JP 2007183356 A JP2007183356 A JP 2007183356A JP 2007183356 A JP2007183356 A JP 2007183356A JP 2009019708 A JP2009019708 A JP 2009019708A
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Japan
Prior art keywords
outer ring
roller bearing
needle roller
divided
roller
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Pending
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JP2007183356A
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Japanese (ja)
Inventor
Masahito Yoshida
雅人 吉田
Susumu Ryu
劉  軍
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NSK Ltd
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NSK Ltd
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Application filed by NSK Ltd filed Critical NSK Ltd
Priority to JP2007183356A priority Critical patent/JP2009019708A/en
Publication of JP2009019708A publication Critical patent/JP2009019708A/en
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30Parts of ball or roller bearings
    • F16C33/58Raceways; Race rings
    • F16C33/60Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings

Abstract

<P>PROBLEM TO BE SOLVED: To provide a needle roller bearing which reduces the adverse effect of a level difference made at a joint portion of a divided race ring and prevents the occurrence of noise and flaking. <P>SOLUTION: The needle roller bearing 10 whose outer ring 12 is circumferentially divided into at least two parts is characterized in that a flank 12e is provided by chamfering, at a circumferential end portion of an inner diameter face 12a of the divided outer ring 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、軌道輪及び保持器を円周方向に少なくとも二分割された針状ころ軸受に関するものであり、例えば自動車用エンジンや産業機械のクランクシャフトやコンロッドの回転部分に使用される分割型針状ころ軸受に関する。   The present invention relates to a needle roller bearing in which a bearing ring and a cage are divided at least in the circumferential direction. For example, a split needle used in a rotating portion of a crankshaft or a connecting rod of an automotive engine or industrial machine. The present invention relates to a tapered roller bearing.

従来から自動車用エンジンのクランクシャフトを支持するための軸受としては、組立上の制約から、主として二分割された分割型滑り軸受が使用されていた。しかし、分割型滑り軸受では、高速回転下での摩擦抵抗が大きい。このため、近年、摩擦抵抗の小さい針状ころ軸受を採用することにより、燃費向上等を図る動きがある。   Conventionally, as a bearing for supporting a crankshaft of an automobile engine, a split sliding bearing divided into two has been mainly used due to restrictions on assembly. However, the split type plain bearing has a high frictional resistance under high speed rotation. For this reason, in recent years, there has been a movement to improve fuel efficiency by adopting needle roller bearings with low frictional resistance.

ここで、針状ころ軸受の軌道輪及び保持器を二分割して分割型ころ軸受とする場合、例えば特許文献1に記載のような一体型軌道輪を「自然割り」なる方法で中心線上で切断する方法が採られている。
特開平6−81846号公報
Here, when the bearing ring and the cage of the needle roller bearing are divided into two to form the split roller bearing, for example, an integral bearing ring as described in Patent Document 1 is formed on the center line by a method of “natural split”. The method of cutting is taken.
JP-A-6-81846

しかしながら、上記方法では、図4に示すように、軸44を支持する軸受40において、分割軌道輪である外輪42の接合部にミクロン単位の段差が発生することが避けられず、軸受40が装着されるハウジングが分割形式の場合は、上下ハウジングの組み付け時のズレが外輪分割面の段差として重畳される。したがって、外輪42のつなぎ目において、ころ41と外輪42の内径面42aの端部のエッジ42cとの衝突により騒音が発生したり、同部からフレーキングが発生したりするという問題がある。なお、図4において外輪42のつなぎ目の段差は誇張して表現されている。   However, in the above method, as shown in FIG. 4, in the bearing 40 that supports the shaft 44, it is inevitable that a step in units of microns occurs at the joint portion of the outer ring 42 that is a divided raceway ring. In the case where the housing to be divided is a split type, a deviation at the time of assembling the upper and lower housings is superimposed as a step on the outer ring dividing surface. Therefore, at the joint of the outer ring 42, there is a problem that noise is generated due to the collision between the roller 41 and the edge 42 c at the end of the inner diameter surface 42 a of the outer ring 42, and flaking occurs from the same part. In FIG. 4, the level difference at the joint of the outer ring 42 is exaggerated.

本発明は、分割軌道輪の接合部に発生する段差による影響を低減し、騒音及びフレーキングの発生を防止する針状ころ軸受を提供することを目的としている。   An object of the present invention is to provide a needle roller bearing that reduces the influence of a step generated at a joint portion of a split raceway ring and prevents noise and flaking.

本発明の上記目的は下記構成により達成される。
(1) 外輪が周方向に少なくとも二分割された針状ころ軸受において、分割された前記外輪の内径面の周方向端部に面取りによる逃げ面が設けられたことを特徴とする針状ころ軸受。
The above object of the present invention can be achieved by the following constitution.
(1) A needle roller bearing in which an outer ring is divided into at least two parts in a circumferential direction, and a relief surface by chamfering is provided at a circumferential end of an inner diameter surface of the divided outer ring. .

(2) 前記逃げ面と前記外輪の周方向端部における半径方向とのなす角度θが60°〜75°であることを特徴とする請求項1記載の針状ころ軸受。 (2) The needle roller bearing according to claim 1, wherein an angle θ formed by the flank and a radial direction at a circumferential end of the outer ring is 60 ° to 75 °.

前記(1)の構成によれば、外輪の内径面の周方向端部に面取りによる逃げ面が設けられることにより、分割された外輪の接合部における段差が面取り空間内に形成され、かつ、軌道面がなだらかな傾斜面となるため、ころが外輪の接合部を転動するときの衝撃が低減されるとともにフレーキングが防止される。   According to the configuration of the above (1), a relief surface by chamfering is provided at the circumferential end of the inner diameter surface of the outer ring, so that a step at the joint portion of the divided outer ring is formed in the chamfering space, and the track Since the surface becomes a gentle inclined surface, impact when the roller rolls on the joint portion of the outer ring is reduced and flaking is prevented.

前記(2)の構成によれば、逃げ面と外輪の周方向端部における半径方向とのなす角度θ(以下、面取り角という。)が60°〜75°であることにより、段差部に適度な逃げ空間が形成され、衝撃が低減される。面取り角が60°より小さいと、ころが転動する傾斜がきつくなるとともに、外輪面取り部と軸間のくさび効果が大きく働く。また、ころが面取り内へ落ち込む量が増えるため、ころの回転を阻害する恐れがある。また、面取り角が75°よりも大きいと、逃げの空間が狭くなり分割部に生じたズレを許容できなくなるため好ましくない。   According to the configuration of (2), an angle θ (hereinafter, referred to as a chamfering angle) formed by the flank and the radial direction at the circumferential end of the outer ring is 60 ° to 75 °, so that the stepped portion is moderate. Relief space is formed and impact is reduced. When the chamfering angle is less than 60 °, the inclination of rolling of the roller becomes tight, and the wedge effect between the outer ring chamfered portion and the shaft acts greatly. Moreover, since the amount of the roller falling into the chamfer increases, the rotation of the roller may be hindered. Further, if the chamfering angle is larger than 75 °, the escape space is narrowed and the deviation generated in the divided portion cannot be allowed, which is not preferable.

本発明の分割型針状ころ軸受によれば、分割された外輪の接合部における段差部をころが転動するときに、衝撃が低減されるので、騒音、フレーキングの発生を防止することができる。   According to the split needle roller bearing of the present invention, when the roller rolls on the stepped portion at the joint portion of the divided outer ring, the impact is reduced, so that generation of noise and flaking can be prevented. it can.

本発明により得られる分割型ころ軸受は、自動車用エンジンのクランクシャフト支持用として、低振動、耐高負荷、高耐久性を要求される場合に好適に用いられる。   The split roller bearing obtained by the present invention is suitably used for supporting a crankshaft of an automobile engine when low vibration, high load resistance, and high durability are required.

以下、図示実施形態により、本発明を説明する。
図1(a)は本発明の第1実施形態である分割型針状ころ軸受の断面図、図1(b)は図1(a)のA部拡大図である。
Hereinafter, the present invention will be described with reference to illustrated embodiments.
FIG. 1A is a cross-sectional view of a split needle roller bearing according to the first embodiment of the present invention, and FIG. 1B is an enlarged view of a portion A in FIG.

図1及び図2を参照すると、分割型針状ころ軸受10は、円周方向に多数配置された針状ころ11と、各ころ11の軌道面となる内径面12aを内周に有する円環状の外輪(軌道輪)12と、外輪12の内周側に配置され、各ころ11を転動可能に保持する保持器(図示せず)と、内輪として機能する軸14とから構成されている。軸14は例えば自動車用エンジンのクランクシャフトであり、この分割型針状ころ軸受10はクランクシャフト14を支持する軸受として用いられる。分割型針状ころ軸受10は、外輪12及び保持器を円周方向に均等に二分割され、円周方向の端面どうしが接合されている。   Referring to FIGS. 1 and 2, a split needle roller bearing 10 has an annular shape having a plurality of needle rollers 11 arranged in the circumferential direction and an inner diameter surface 12a serving as a raceway surface of each roller 11 on the inner periphery. The outer ring (orbital ring) 12, a cage (not shown) that is disposed on the inner peripheral side of the outer ring 12 and holds each roller 11 in a rollable manner, and a shaft 14 that functions as an inner ring. . The shaft 14 is, for example, a crankshaft of an automobile engine, and the split needle roller bearing 10 is used as a bearing that supports the crankshaft 14. In the split needle roller bearing 10, the outer ring 12 and the cage are equally divided into two in the circumferential direction, and the end surfaces in the circumferential direction are joined to each other.

外輪12の内径面の円周方向端面には面取り面からなる逃げ面12eが形成されている。逃げ面12eは外輪を分割した後に設けられる。逃げ面12eと外輪12の円周方向端部12bにおける半径方向とのなす角度θ、すなわち面取り角θは60°〜75°である。   A flank 12 e made of a chamfered surface is formed on the circumferential end surface of the inner diameter surface of the outer ring 12. The flank 12e is provided after dividing the outer ring. The angle θ between the flank 12e and the radial direction at the circumferential end 12b of the outer ring 12, that is, the chamfer angle θ is 60 ° to 75 °.

外輪12の内径面12aの円周方向端部に面取りによる逃げ面12eが形成されていることにより、外輪12の接合部に半径方向のずれが生じた場合でも、ずれは曲率半径R2のころ11の周面と面取り接線との間の空間に位置するため、ずれによって生じた段差部のエッジ12cところ11とが干渉しない。また、ころ11は面取りによる斜面をなだらかに通過して行くため、反対側のエッジとの衝突も避けられる。   By forming a relief surface 12e by chamfering at the circumferential end of the inner diameter surface 12a of the outer ring 12, even when a radial deviation occurs in the joint portion of the outer ring 12, the deviation is a roller 11 having a curvature radius R2. Therefore, the edge 12c of the stepped portion 11 caused by the deviation does not interfere with each other. Moreover, since the roller 11 passes smoothly through the chamfered slope, collision with the opposite edge can be avoided.

なお、面取り角θが60°より小さいと、ころ11が転動する傾斜がきつくなるとともに、外輪面取り部と軸間のくさび効果が大きく働く。また、ころ11が面取り内へ落ち込む量が増えるため、ころ11の回転を阻害する恐れがある。また、面取り角θが75°より大きいと、逃げの空間が狭くなり、分割部に生じたズレを許容できなくなるので、逃げとしての機能がなくなり好ましくない。   When the chamfering angle θ is smaller than 60 °, the rolling inclination of the roller 11 becomes tight, and the wedge effect between the outer ring chamfered portion and the shaft acts greatly. Further, since the amount of the roller 11 falling into the chamfer increases, the rotation of the roller 11 may be hindered. On the other hand, if the chamfering angle θ is larger than 75 °, the escape space is narrowed and the deviation generated in the divided portion cannot be allowed.

図2及び図3は逃げ面としてなだらかな曲面を設けた例である。図2に示すように、曲面の曲率半径R1がころ11の半径R2よりも大きいと、曲面により形成された凹部である逃げ部にころが入り込み、逃げのない場合と同様に、ころ11が段差のエッジ12cに衝突して衝撃による騒音やフレーキングの発生の問題を引き起こす。また、図3に示すように、曲面の曲率半径R1をころ11の半径R2よりも小さくすれば、ころ11が曲面により形成された凹部内に入り込まず分割部に生じた段差のエッジ12cとの衝突を回避することは可能であるが、ころ11が逃げの反対面のエッジ12dと衝突するため、衝撃による騒音やフレーキングの発生の問題がある。   2 and 3 show examples in which a gentle curved surface is provided as a flank. As shown in FIG. 2, when the curvature radius R1 of the curved surface is larger than the radius R2 of the roller 11, the roller enters the relief portion that is a concave portion formed by the curved surface, and the roller 11 has a step as in the case of no relief. Impacting on the edge 12c of the device causes problems of noise and flaking due to impact. Further, as shown in FIG. 3, if the radius of curvature R1 of the curved surface is made smaller than the radius R2 of the roller 11, the roller 11 does not enter the concave portion formed by the curved surface and the step edge 12c generated in the divided portion is formed. Although it is possible to avoid the collision, since the roller 11 collides with the edge 12d on the opposite side of the relief, there is a problem of noise and flaking due to impact.

以上のように上記実施形態によれば、外輪の内径面の周方向端部に面取りによる逃げ面が設けられることにより、分割された外輪の接合部における段差が平坦面に近づいてならされ、ころが外輪の接合部を転動するときに段差と衝突することがなく、衝撃が低減されるとともにフレーキングが防止される。   As described above, according to the above-described embodiment, by providing the relief surface by chamfering at the circumferential end of the inner diameter surface of the outer ring, the step at the joint portion of the divided outer ring approaches the flat surface. Does not collide with the step when rolling the joint portion of the outer ring, impact is reduced and flaking is prevented.

(a)は本発明の第1実施形態である分割型ころ軸受を示す断面図であり、(b)は(a)のA部拡大図である。(A) is sectional drawing which shows the split-type roller bearing which is 1st Embodiment of this invention, (b) is the A section enlarged view of (a). (a)は分割型ころ軸受の変形例の断面図であり、(b)は(a)のB部拡大図である。(A) is sectional drawing of the modification of a split roller bearing, (b) is the B section enlarged view of (a). (a)は分割型ころ軸受の他の変形例の断面図であり、(b)は(a)のC部拡大図である。(A) is sectional drawing of the other modification of a split type roller bearing, (b) is the C section enlarged view of (a). (a)は従来の分割型ころ軸受の断面図であり、(b)は(a)のD部拡大図である。(A) is sectional drawing of the conventional split roller bearing, (b) is the D section enlarged view of (a).

符号の説明Explanation of symbols

10,40 軸受
11,41 ころ
12,42 外輪
12a 内径面
12b 端面
12c,12d エッジ
12e 逃げ面
14,44 軸
10, 40 Bearing 11, 41 Roller 12, 42 Outer ring 12a Inner diameter surface 12b End surface 12c, 12d Edge 12e Flank 14,44 Shaft

Claims (2)

外輪が周方向に少なくとも二分割された針状ころ軸受において、分割された前記外輪の内径面の周方向端部に面取りによる逃げ面が設けられたことを特徴とする針状ころ軸受。   A needle roller bearing in which an outer ring is divided into at least two in the circumferential direction, and a relief surface by chamfering is provided at a circumferential end of an inner diameter surface of the divided outer ring. 前記逃げ面と前記外輪の周方向端部における半径方向とのなす角度θが60°〜75°であることを特徴とする請求項1記載の針状ころ軸受。   2. The needle roller bearing according to claim 1, wherein an angle θ formed between the flank and a radial direction at a circumferential end of the outer ring is 60 ° to 75 °.
JP2007183356A 2007-07-12 2007-07-12 Split type needle roller bearing Pending JP2009019708A (en)

Priority Applications (1)

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JP2007183356A JP2009019708A (en) 2007-07-12 2007-07-12 Split type needle roller bearing

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013175922A1 (en) 2012-05-21 2013-11-28 Ntn株式会社 Roller bearing and shaft support structure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013175922A1 (en) 2012-05-21 2013-11-28 Ntn株式会社 Roller bearing and shaft support structure
KR20150006437A (en) 2012-05-21 2015-01-16 엔티엔 가부시키가이샤 Roller bearing and shaft support structure
US9512881B2 (en) 2012-05-21 2016-12-06 Ntn Corporation Roller bearing and shaft support structure

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