JPS627908A - Cam follower with roller - Google Patents

Cam follower with roller

Info

Publication number
JPS627908A
JPS627908A JP14624185A JP14624185A JPS627908A JP S627908 A JPS627908 A JP S627908A JP 14624185 A JP14624185 A JP 14624185A JP 14624185 A JP14624185 A JP 14624185A JP S627908 A JPS627908 A JP S627908A
Authority
JP
Japan
Prior art keywords
roller
cam follower
roller shaft
cam
shaft
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.)
Granted
Application number
JP14624185A
Other languages
Japanese (ja)
Other versions
JPH0615811B2 (en
Inventor
Tsuneo Tauchi
常夫 田内
Hideo Ueshima
英夫 上嶋
Tsutomu Saka
坂　勉
Takao Ito
伊東　孝夫
Yoshimitsu Murakami
村上　義光
Tadashi Kimura
正 木村
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.)
Honda Motor Co Ltd
Original Assignee
Honda Motor 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 Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP60146241A priority Critical patent/JPH0615811B2/en
Publication of JPS627908A publication Critical patent/JPS627908A/en
Publication of JPH0615811B2 publication Critical patent/JPH0615811B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/64—Special methods of manufacture

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

PURPOSE:To reduce the cost of production, by supporting a roller of a cam follower which contacts to the surface of a cam, in the forked part of this cam follower, by a needle bearing, performing induction hardening on the outer circumference of a roller shaft, and fixing both ends of this roller shaft with calkers, as they are unhardened. CONSTITUTION:A roller 9 of a cam follower 1 which rotatingly moves along a cam 10, is supported in the forked part of the end of this cam follower 1, by a roller shaft 13 through a needle bearing 15. A part of the outer circumference of the roller shaft 13, which is supported with the needle bearing 15, is induction-hardened, and near the both ends of this roller shaft 13 are not hardened. After the roller 9 is built in, both ends of the roller shaft 13 are fixed with calkers 16.

Description

【発明の詳細な説明】 Ａ６発明の目的 （１）産業上の利用分野 本発明は内燃機関の動弁機構等に組み込まれるローラ付
カムフォロアに関するものである。DETAILED DESCRIPTION OF THE INVENTION A6 Object of the Invention (1) Field of Industrial Application The present invention relates to a cam follower with a roller that is incorporated into a valve mechanism of an internal combustion engine.

（２）従来の技術 従来カムフォロア本体にニードル軸受を介してローラを
回転自在に支承してなるローラ付カムフォロアは公知で
ある（実開昭５７−８５６５３号公報参照）。(2) Prior art A conventional cam follower with a roller is known in which a roller is rotatably supported on the cam follower body via a needle bearing (see Japanese Utility Model Application No. 85653/1983).

（３）発明が解決しようとする問題点 ところでかかるローラ付カムフォロアは、カムフォロア
本体とローラ間に摩耗、変形等が生じないようにしてロ
ーラが長期使用によるも円滑、軽快に回転できるように
すること、全体をできるだけコンパクト化すること、お
よび製作コストを低　　　　　　　、。(3) Problems to be Solved by the Invention The cam follower with rollers is designed to prevent wear, deformation, etc. between the cam follower body and the rollers, so that the rollers can rotate smoothly and easily even after long-term use. , to make the whole thing as compact as possible, and to keep production costs low.

滅すること等が要求されるが従来のものでばかかる要求
を満足できるものではなかった。However, conventional methods have not been able to satisfy such requirements.

本発明は上記要求をすべて満足できるようにした、構成
簡単なローラ付カムフォロアを提供することを目的とす
るものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a roller-equipped cam follower with a simple structure that satisfies all of the above requirements.

Ｂ１発明の構成 （１）問題点を解決するための手段 本発明によれば、前記目的達成のためカムフォロア本体
の先部に二叉のフォーク状のローラ保持部を形成し、こ
のローラ保持部の凹部にローラを挿入し、このローラを
前記ローラ保持部のローラ軸孔に固定したローラ軸にニ
ードル軸受を介して回転自在に支承してなるローラ付カ
ムフォロアにおいて、前記ローラ軸は、前記ニードル軸
受のニードルの接触する外周面に高周波焼入を施し、ま
たその両端面を未焼入のまま前記軸孔の両端縁にかしめ
固定する。B1 Structure of the Invention (1) Means for Solving Problems According to the present invention, in order to achieve the above-mentioned object, a fork-shaped roller holding portion is formed at the tip of the cam follower main body, and the roller holding portion is In a cam follower with a roller, a roller is inserted into a recessed portion, and this roller is rotatably supported via a needle bearing on a roller shaft fixed to a roller shaft hole of the roller holding portion. The outer circumferential surface that the needle contacts is subjected to induction hardening, and both end surfaces of the needle are caulked and fixed to both end edges of the shaft hole while remaining unhardened.

（２）作　用 前記構成によれば、カムフォロアに固定され、ローラを
ニードル軸受を介して回転自在に支承するローラ軸は、
その摩耗、変形が大幅に低減されてローラは長期にわた
って円滑、軽快に回転され、また前記ローラはカムフォ
ロア本体に対して外方に出張ることなく、該カムフォロ
ア本体にかしめ固定される。(2) Effect According to the above configuration, the roller shaft that is fixed to the cam follower and rotatably supports the roller via the needle bearing is
Abrasion and deformation thereof are greatly reduced, and the roller rotates smoothly and lightly over a long period of time, and the roller is caulked and fixed to the cam follower body without protruding outward from the cam follower body.

（３）実施例 次に図面により、本発明ローラ付カムフォロアを４サイ
クル内燃機関の動弁機構に実施した場合の実施例につい
て説明する。(3) Embodiment Next, an embodiment in which the cam follower with roller of the present invention is applied to a valve mechanism of a four-stroke internal combustion engine will be described with reference to the drawings.

第１図において、炭素鋼の鍛造より形成されるカムフォ
ロア本体１は、その中間部に軸孔２が穿設され、この軸
孔２には、軸受メタル３を介してカムフォロア軸４が回
転自在に貫通される。In FIG. 1, a cam follower main body 1 formed by forging carbon steel has a shaft hole 2 bored in its middle part, and a cam follower shaft 4 is rotatably inserted into this shaft hole 2 via a bearing metal 3. be penetrated.

カムフォロア本体１の基部には、アジャストねじ５が螺
挿される。このアジャストねし５ば日ツクナツト６によ
り固定され、その下端に内燃機関の吸気弁、もしくは排
気弁７の上端が弁ばね８の弾発力で当接される。An adjustment screw 5 is screwed into the base of the cam follower body 1. This adjustment screw 5 is fixed by a nut 6, and the upper end of an intake valve or exhaust valve 7 of an internal combustion engine is brought into contact with the lower end thereof by the elastic force of a valve spring 8.

カムフォロア本体１の先部にはローラ９が回転自在に支
承され、このローラ９の外周面はカムＩＯのカム面に、
前記弁ばね８の弾発力で圧接され、カム１０が回転すれ
ば、ローラ９介してカムフォロア本体１はカムフォロア
軸４回りに揺動して吸気弁もしくは排気弁７を開閉作動
する。A roller 9 is rotatably supported at the tip of the cam follower main body 1, and the outer peripheral surface of this roller 9 is connected to the cam surface of the cam IO.
When the cam 10 is pressed by the elastic force of the valve spring 8 and rotates, the cam follower main body 1 swings around the cam follower shaft 4 via the roller 9 to open and close the intake valve or the exhaust valve 7.

次に主に第２図を参照してローラ９の支持構造について
説明する。Next, the support structure of the roller 9 will be explained mainly with reference to FIG.

カムフォロア本体１の先部は、二叉のフォーク状をなす
ローラ保持部１ａが形成されこのローラ保持部１ａに形
成したローラ軸孔１２にはローラ軸１３が後に詳述する
ようにかしめ固定１７される。ローラ軸１３の外周面中
央部には、ローラ保持部１ａの凹部１１に挿入されるロ
ーラ９がニードル軸受１５を介して回転自在に支承され
、このローラ９の外周部はローラ保持部１ａの先端面よ
りも外方に突出される。A fork-shaped roller holding portion 1a is formed at the tip of the cam follower main body 1, and a roller shaft 13 is caulked and fixed 17 in a roller shaft hole 12 formed in the roller holding portion 1a, as will be described in detail later. Ru. A roller 9 inserted into the recess 11 of the roller holding part 1a is rotatably supported at the center of the outer peripheral surface of the roller shaft 13 via a needle bearing 15, and the outer peripheral part of the roller 9 is connected to the tip of the roller holding part 1a. Projected outward from the surface.

前記ローラ軸１３は高炭素クロム軸受鋼により構成され
、その外周面には高周波焼入が施される。The roller shaft 13 is made of high carbon chromium bearing steel, and its outer peripheral surface is induction hardened.

またローラ軸１３の両端面は焼入を行わずかしめ加工が
し易くしてあり、該両端縁は、ローラ軸孔１２の両端の
面取り１６端縁にかしめ固定１７される。このかしめ固
定１７はローラ軸１３の全周にわたって行うのが好まし
い。これによりローラ軸１３はローラ軸孔１２に堅固に
固定され、該軸１３の両端はカムフォロア本体１のロー
ラ保持部１ａの両側面より外方に出張ることがない。Further, both end surfaces of the roller shaft 13 are hardened to facilitate caulking, and the both end edges are caulked and fixed 17 to the chamfered edges 16 at both ends of the roller shaft hole 12. This caulking fixing 17 is preferably performed over the entire circumference of the roller shaft 13. As a result, the roller shaft 13 is firmly fixed in the roller shaft hole 12, and both ends of the shaft 13 do not protrude outward from both sides of the roller holding portion 1a of the cam follower main body 1.

而してローラ軸１３の外周面の硬度は、第３図に示すよ
うにその中央Ｃ点近傍で最も高（Ｈｖ−６９７〜８３２
、その外側のＢ、Ｃ点近傍で６５３〜８３２、さらにそ
の外側のＡ、Ｅ近傍で１９２〜３３６であり、ニードル
軸受１５のニードル１５ａは前記略Ｂ−Ｄ間にわたって
ローラ軸１３の外周面に接触する。またローラ軸１３の
、焼入を行わない両端面の硬度はＨｖ＝２００〜２８０
である。As shown in FIG. 3, the hardness of the outer circumferential surface of the roller shaft 13 is highest (Hv-697 to 832 Hv) near the center point C.
, 653 to 832 near points B and C on the outside, and 192 to 336 near points A and E on the outside. Contact. The hardness of both end surfaces of the roller shaft 13 that are not hardened is Hv=200 to 280.
It is.

次に本発明の実施例の作用について説明すると、いまカ
ム１０が回転すれば、ローラ９はローラ軸１３上をニー
ドル軸受１５を介して転勤するが、ローラ軸１３の外周
面は高周波焼入が施されていることにより、極めて硬度
が大で摩耗、変形することがなく、ローラ９は長期にわ
たってガタ付いたり、傾いたりすることなく円滑、軽快
に回転し、カム１０の回転をカムフォロア本体１に伝達
することができる。Next, to explain the operation of the embodiment of the present invention, when the cam 10 rotates, the roller 9 moves on the roller shaft 13 via the needle bearing 15, but the outer peripheral surface of the roller shaft 13 is induction hardened. As a result of this, the roller 9 has extremely high hardness and will not wear out or deform, and the roller 9 rotates smoothly and easily over a long period of time without wobbling or tilting, and transfers the rotation of the cam 10 to the cam follower body 1. can be transmitted.

またローラ軸１３はその両端面は未焼入のままであり、
かしめ固定１７により容易に塑性変形してカムフォロア
本体１の軸受１２に堅固にかしめ固定され、その軸方向
移動や回転が阻止される。In addition, both end surfaces of the roller shaft 13 remain unhardened,
The caulking fixation 17 easily plastically deforms and is firmly caulked and fixed to the bearing 12 of the cam follower main body 1, thereby preventing its axial movement and rotation.

Ｃ０発明の効果 以上の実施例により明らかなように、本発明によれば、
ローラ軸の、ニードル軸受のニードルが接触する外周面
に高周波焼入を施して高硬度としたのでローラからの負
荷によるも該外周面の摩耗、変形を大幅に低減してロー
ラを常に円滑、軽快に回転させることができ、カムから
カムフォロアへの動力伝達を能率よく行うことができる
。Effects of C0 Invention As is clear from the above examples, according to the present invention,
The outer circumferential surface of the roller shaft, where the needle of the needle bearing comes into contact, has been induction hardened to make it highly hard, which greatly reduces wear and deformation of the outer circumferential surface due to the load from the roller, making the roller always smooth and light. This allows for efficient power transmission from the cam to the cam follower.

またローラ軸の両端面は未焼入のままローラ軸孔の両端
縁内面にかしめ固定するので、ローラ軸は、その外周面
を高硬度としたにも拘らずローラ軸のローラ軸孔へのか
しめ固定を容易、かつ確実に行うことができローラ軸の
軸方向の移動や回転を生起する心配がない。In addition, both end surfaces of the roller shaft are caulked and fixed to the inner surfaces of both ends of the roller shaft hole while remaining unhardened, so even though the outer peripheral surface of the roller shaft is made of high hardness, the roller shaft is not caulked into the roller shaft hole. Fixation can be easily and reliably carried out, and there is no fear of axial movement or rotation of the roller shaft.

さらにローラ軸はカムフォロア本体のローラ保持部の側
面より出張ることがなく、ローラ付カムフォロア全体の
コンパクト化を図ることができる。Furthermore, the roller shaft does not protrude from the side surface of the roller holding portion of the cam follower main body, and the entire cam follower with rollers can be made more compact.

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

図面は本発明装置の一実施例を示すもので、第１図はそ
の側面図、第２図は第１図ｎ−ｎ線拡大横断面図、第３
図はローラ軸の側面図である。 １・・・カムフォロア本体、１ａ・・・口〜う保持部、
２・・・軸孔、９・・・ローラ、１１・・・凹部、１２
・・・ローラ軸孔、１３・・・ローラ軸、１５・・・ニ
ードル軸受、１６・・・面取りThe drawings show one embodiment of the device of the present invention, and FIG. 1 is a side view thereof, FIG. 2 is an enlarged cross-sectional view taken along line nn of FIG. 1, and FIG.
The figure is a side view of the roller shaft. 1... Cam follower body, 1a... Mouth-to-holding part,
2... Shaft hole, 9... Roller, 11... Recess, 12
... Roller shaft hole, 13 ... Roller shaft, 15 ... Needle bearing, 16 ... Chamfer

Claims (2)

【特許請求の範囲】[Claims] （１）カムフォロア本体の先部に二叉のフォーク状のロ
ーラ保持部を形成し、このローラ保持部の凹部にローラ
を挿入し、このローラを前記ローラ保持部のローラ軸孔
に固定したローラ軸にニードル軸受を介して回転自在に
支承してなるローラ付カムフォロアにおいて、前記ロー
ラ軸は、前記ニードル軸受のニードルの接触する外周面
に高周波焼入を施し、またその両端面を未焼入のまま前
記軸孔の両端縁にかしめ固定したことを特徴とするロー
ラ付カムフォロア。(1) A roller shaft in which a two-pronged fork-shaped roller holding part is formed at the tip of the cam follower main body, a roller is inserted into the recess of this roller holding part, and this roller is fixed in the roller shaft hole of the roller holding part. In the cam follower with a roller, which is rotatably supported through a needle bearing, the roller shaft is induction hardened on its outer peripheral surface which is in contact with the needle of the needle bearing, and its both end surfaces are left unhardened. A cam follower with a roller, characterized in that the cam follower is caulked and fixed to both ends of the shaft hole. （２）前記特許請求の範囲第（１）項記載のローラ付カ
ムフォロアにおいて、前記軸孔の両端縁にかしめ用面取
りを施したことを特徴とする、ローラ付カムフォロア。(2) A cam follower with a roller according to claim (1), characterized in that both ends of the shaft hole are chamfered for caulking.
JP60146241A 1985-07-03 1985-07-03 Cam follower with roller Expired - Lifetime JPH0615811B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60146241A JPH0615811B2 (en) 1985-07-03 1985-07-03 Cam follower with roller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60146241A JPH0615811B2 (en) 1985-07-03 1985-07-03 Cam follower with roller

Related Child Applications (3)

Application Number Title Priority Date Filing Date
JP3022310A Division JP2737031B2 (en) 1991-02-15 1991-02-15 Rocker arm with roller
JP3022309A Division JP2782386B2 (en) 1991-02-15 1991-02-15 Rocker arm with roller for valve train of internal combustion engine
JP2231191A Division JPH0680287B2 (en) 1991-02-15 1991-02-15 Cam follower with roller

Publications (2)

Publication Number Publication Date
JPS627908A true JPS627908A (en) 1987-01-14
JPH0615811B2 JPH0615811B2 (en) 1994-03-02

Family

ID=15403290

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60146241A Expired - Lifetime JPH0615811B2 (en) 1985-07-03 1985-07-03 Cam follower with roller

Country Status (1)

Country Link
JP (1) JPH0615811B2 (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6434406U (en) * 1987-08-27 1989-03-02
JPH0392509U (en) * 1990-01-10 1991-09-20
US5054440A (en) * 1989-06-29 1991-10-08 Nippon Seiko Kabushiki Kaisha Cam follower device for valve driving mechanism in engine
JPH03116706U (en) * 1990-03-12 1991-12-03
JPH0493510U (en) * 1990-12-28 1992-08-13
JPH0493511U (en) * 1990-12-28 1992-08-13
JPH0493509U (en) * 1990-12-28 1992-08-13
JPH0579104U (en) * 1992-03-31 1993-10-26 エヌティエヌ株式会社 Cam follower with roller
US5375323A (en) * 1991-10-30 1994-12-27 Nsk Ltd. Method for securing shaft of cam follower device for valve action mechanism
WO2003044330A1 (en) * 2001-11-21 2003-05-30 Nsk Ltd. Cam follower with sheet metal rocker arm
EP1329596A2 (en) * 2002-01-16 2003-07-23 Ntn Corporation Cam follower with roller
WO2003064821A1 (en) * 2002-02-01 2003-08-07 Nsk Ltd. Cam follower provided with rocker arm made of sheet metal
WO2004003349A1 (en) * 2002-06-27 2004-01-08 Ina-Schaeffler Kg Positional fixing of a pin
EP1669556A1 (en) * 2004-11-17 2006-06-14 JTEKT Corporation Rocker arm bearing
EP1701052A2 (en) 2005-03-11 2006-09-13 Ntn Corporation Rolling bearing
US7603929B2 (en) 2003-06-05 2009-10-20 Ntn Corporation Rolling bearing, cam-follower with roller, and cam
JP2009243473A (en) * 2009-07-30 2009-10-22 Ntn Corp Method of manufacturing rocker arm
US7614374B2 (en) 2004-08-02 2009-11-10 Ntn Corporation Rolling bearing for rocker arm

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2259325A (en) * 1939-12-23 1941-10-14 Thomas L Robinson Roller bearing
JPS6088016U (en) * 1983-11-24 1985-06-17 日本精工株式会社 Cam follower device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2259325A (en) * 1939-12-23 1941-10-14 Thomas L Robinson Roller bearing
JPS6088016U (en) * 1983-11-24 1985-06-17 日本精工株式会社 Cam follower device

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6434406U (en) * 1987-08-27 1989-03-02
US5054440A (en) * 1989-06-29 1991-10-08 Nippon Seiko Kabushiki Kaisha Cam follower device for valve driving mechanism in engine
JPH0392509U (en) * 1990-01-10 1991-09-20
JPH03116706U (en) * 1990-03-12 1991-12-03
JPH0493510U (en) * 1990-12-28 1992-08-13
JPH0493511U (en) * 1990-12-28 1992-08-13
JPH0493509U (en) * 1990-12-28 1992-08-13
US5375323A (en) * 1991-10-30 1994-12-27 Nsk Ltd. Method for securing shaft of cam follower device for valve action mechanism
JPH0579104U (en) * 1992-03-31 1993-10-26 エヌティエヌ株式会社 Cam follower with roller
WO2003044330A1 (en) * 2001-11-21 2003-05-30 Nsk Ltd. Cam follower with sheet metal rocker arm
EP1329596A2 (en) * 2002-01-16 2003-07-23 Ntn Corporation Cam follower with roller
EP1329596A3 (en) * 2002-01-16 2007-09-05 Ntn Corporation Cam follower with roller
WO2003064821A1 (en) * 2002-02-01 2003-08-07 Nsk Ltd. Cam follower provided with rocker arm made of sheet metal
US6978750B2 (en) 2002-02-01 2005-12-27 Nsk Ltd. Cam follower provided with rocker arm made of sheet metal
WO2004003349A1 (en) * 2002-06-27 2004-01-08 Ina-Schaeffler Kg Positional fixing of a pin
CN100359138C (en) * 2002-06-27 2008-01-02 依纳-谢夫勒两合公司 Positional fixing of a pin
US7603929B2 (en) 2003-06-05 2009-10-20 Ntn Corporation Rolling bearing, cam-follower with roller, and cam
US7614374B2 (en) 2004-08-02 2009-11-10 Ntn Corporation Rolling bearing for rocker arm
EP2159437A2 (en) 2004-08-02 2010-03-03 Ntn Corporation Rolling bearing for rocker arm
EP2345822A2 (en) 2004-08-02 2011-07-20 NTN Corporation Rolling bearing for rocker arm
EP1669556A1 (en) * 2004-11-17 2006-06-14 JTEKT Corporation Rocker arm bearing
EP1701052A2 (en) 2005-03-11 2006-09-13 Ntn Corporation Rolling bearing
JP2009243473A (en) * 2009-07-30 2009-10-22 Ntn Corp Method of manufacturing rocker arm

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