JP2010156247A - Rocker arm and method for polish finishing thereof - Google Patents

Rocker arm and method for polish finishing thereof Download PDF

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JP2010156247A
JP2010156247A JP2008334510A JP2008334510A JP2010156247A JP 2010156247 A JP2010156247 A JP 2010156247A JP 2008334510 A JP2008334510 A JP 2008334510A JP 2008334510 A JP2008334510 A JP 2008334510A JP 2010156247 A JP2010156247 A JP 2010156247A
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rocker arm
cam
sliding surface
buffing
finishing
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JP5231980B2 (en
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Makoto Momozaki
信 百▲崎▼
Aki Kotai
亜紀 小鯛
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Kawasaki Heavy Industries Ltd
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Kawasaki Heavy Industries Ltd
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  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rocker arm reduced in the wear of a sliding surface with a cam and reduced in an influence on the cam, and a method for polish-finishing the rocker arm. <P>SOLUTION: The method for polish-finishing the rocker arm 6 for actuating an intake or exhaust valve 8 driven by the sliding with the cam 4 linked with a rotating shaft of an engine includes: a plating process 20 for chrome plating at least the sliding surface 12 with the cam 4 on the rocker arm 6; a rough polishing process 22 for rough polishing the sliding surface 12 by means of rough buffing or lapping; and a finishing buff polishing process 24 for buff polishing the sliding surface 12 using a buffing material of a cloth material applied with abrasive grains. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、エンジンにおける動弁系部品の一つで、カムにより駆動されてバルブを作動させるロッカーアームとその研磨仕上げ方法に関するものである。   The present invention relates to a rocker arm which is one of valve-operating system parts in an engine and which is driven by a cam to operate a valve, and a polishing finishing method thereof.

ロッカーアーム式のエンジンにおいては、ロッカーアームとカムとの摩擦により、ロッカーアームにおけるカムとの摺動面が磨耗して、摺動面のめっき層が剥離がすることがある。この剥離の発生を抑える対策として、浸炭、焼入れ、焼き戻し後に、荒研磨を施し、さらにショットピーニングを施したうえで、クロムめっき処理したものや（特許文献１）、焼結合金をろう付けしたものがある。
特開平９−１７７５１５号公報 In a rocker arm type engine, the sliding surface between the rocker arm and the cam may be worn by friction between the rocker arm and the cam, and the plating layer on the sliding surface may be peeled off. As measures to suppress the occurrence of this peeling, after carburizing, quenching, and tempering, rough polishing, and further shot peening, and then chrome-plated or brazed sintered alloy (Patent Document 1) There is something.
JP-A-9-177515

しかしながら、近年のエンジンの高出力化に伴い、混合気流量が増大してバルブのリフト量が大きくなり、それに伴って、摺動面に作用する圧力が大きくなる傾向にある。そのため、上記特許文献１による表面仕上げでは、十分とはいえなくなってきた。また、焼結合金をろう付けした場合は、ロッカーアーム側の磨耗を抑えることはできるが、硬い焼結合金によりカムのノーズ部分が磨耗し易くなる。   However, with the recent increase in engine output, the air-fuel mixture flow rate increases and the lift amount of the valve increases, and accordingly, the pressure acting on the sliding surface tends to increase. Therefore, the surface finishing according to Patent Document 1 has not been sufficient. Further, when the sintered alloy is brazed, wear on the rocker arm side can be suppressed, but the nose portion of the cam is easily worn by the hard sintered alloy.

本発明は、上記課題に鑑みてなされたもので、カムとの摺動面の磨耗、およびカムへの影響を抑えることができるロッカーアームとその研磨仕上げ方法を提供することを目的としている。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a rocker arm capable of suppressing wear on a sliding surface with a cam and an influence on the cam, and a polishing finishing method thereof.

上記目的を達成するために、本発明の方法は、エンジンの回転軸に連動したカムとの摺動により駆動されて吸気または排気弁を作動させるロッカーアームの研磨仕上げ方法であって、ロッカーアームにおける少なくとも前記カムとの摺動面にクロムめっきを施すめっき工程と、荒バフまたはラッピングにより前記摺動面を荒研磨する荒研磨工程と、布素材のバフに砥粒を付着させたバフ材を用いて前記摺動面をバフ研磨する仕上バフ研磨工程とを備えている。  In order to achieve the above object, the method of the present invention is a method for polishing and finishing a rocker arm that is driven by sliding with a cam linked to an engine rotation shaft to operate an intake or exhaust valve. Using a plating process for performing chrome plating on at least the sliding surface with the cam, a rough polishing process for rough polishing the sliding surface by rough buffing or lapping, and a buff material in which abrasive grains are adhered to the buff of the cloth material And a finishing buffing step of buffing the sliding surface.

この構成によれば、荒研磨工程に続いて、布素材のバフに砥粒を付着させたバフ材による仕上バフ研磨工程を実行するので、ロッカーアームにおけるカムとの摺動面の面粗度が改善され、ロッカーアームとカムとの間の摩擦が低減される結果、前記摺動面の磨耗を抑えることができる。また、面粗度を改善するだけで、ロッカーアームの硬さは増大しないので、カムのノーズ部分を磨耗させるような影響をカムに与えることもない。   According to this configuration, after the rough polishing step, the finish buff polishing step is performed with the buff material in which abrasive grains are adhered to the buff of the cloth material. Therefore, the surface roughness of the sliding surface with the cam in the rocker arm is reduced. As a result, the friction between the rocker arm and the cam is reduced, so that the wear of the sliding surface can be suppressed. Further, since the hardness of the rocker arm is not increased only by improving the surface roughness, the cam is not affected as if the nose portion of the cam is worn.

本発明において、前記布素材は麻であることが好ましい。この構成によれば、面粗度の小さい摺動面が容易に得られる。   In the present invention, the cloth material is preferably hemp. According to this configuration, a sliding surface having a small surface roughness can be easily obtained.

本発明に係るロッカーアームは、エンジンの回転軸に連動したカムとの摺動により駆動されて吸気または排気弁を作動させるロッカーアームであって、荒研磨と仕上バフ研磨により、前記ロッカーアームにおける少なくとも前記カムとの摺動面の面粗度Ｒｚが０．５μｍ以下であり、かつ前記摺動面における０．１μｍ以上の凹凸の周期が５０μｍ以上である。   A rocker arm according to the present invention is a rocker arm that is driven by sliding with a cam interlocked with a rotating shaft of an engine to actuate an intake or exhaust valve, and at least in the rocker arm by rough polishing and finish buff polishing. The surface roughness Rz of the sliding surface with the cam is 0.5 μm or less, and the period of irregularities of 0.1 μm or more on the sliding surface is 50 μm or more.

面粗度Ｒｚが小さくなれば摩擦力を低減させることが期待できるが、面粗度Ｒｚを小さくし過ぎると潤滑油の保持性能が低下するので、かえって磨耗が起こり易くなることがある。本件発明者は、実験により、面粗度Ｒｚを０．５μｍ以下とすることで、潤滑油の保持性能を維持しつつ摩擦力を低減して、前記摺動面の磨耗を効果的に抑えることができることを見い出した。さらに、摺動面における０．１μｍ以上の凹凸の周期を５０μｍ以上とすることで、ロッカーアームの摺動面が、カムのノーズ部分を磨耗させるような、カムへの影響を抑制できることも見い出された。   If the surface roughness Rz is reduced, the frictional force can be expected to be reduced. However, if the surface roughness Rz is excessively reduced, the lubricating oil retention performance is lowered, so that wear may easily occur. The inventors of the present invention have experimentally reduced the frictional force while maintaining the lubricating oil retention performance, and effectively restrains the wear of the sliding surface by setting the surface roughness Rz to 0.5 μm or less. I found out that I can do it. Furthermore, it has also been found that by setting the period of irregularities of 0.1 μm or more on the sliding surface to 50 μm or more, the sliding surface of the rocker arm can suppress the influence on the cam such that the nose portion of the cam is worn. It was.

本発明のロッカーアームの製造方法によれば、ロッカーアームにおけるカムとの摺動面の面粗度が改善される結果、前記摺動面の磨耗を抑えることができるうえに、カムに影響を与えることもない。
また、本発明のロッカーアームによれば、潤滑油の保持性能を維持しつつ摩擦を低減して、前記摺動面の磨耗を効果的に抑えることができるうえに、ロッカーアームの摺動面がカムに影響を与えるのを抑えることができる。 According to the rocker arm manufacturing method of the present invention, the surface roughness of the sliding surface with the cam in the rocker arm is improved, so that wear of the sliding surface can be suppressed and the cam is affected. There is nothing.
Further, according to the rocker arm of the present invention, it is possible to reduce friction while maintaining the retention performance of the lubricating oil, and to effectively suppress wear of the sliding surface. The influence on the cam can be suppressed.

以下、本発明の好ましい実施形態について図面を参照しながら詳述する。
図１は、エンジンの動弁系を示す側面図である。動弁系では、クランクシャフト（図示しない）に歯形ベルトまたはチェーンのような動力伝達機構を介してカムシャフト２が連動して回転しており、このカムシャフト２に設けられたカム４の駆動力が、ロッカーアーム６によりエンジンの吸気または排気弁を構成するバルブ８に伝えられて、バルブ８が作動し、燃焼室の吸排気口を開閉する。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a side view showing a valve train of an engine. In the valve train, the camshaft 2 rotates in conjunction with a crankshaft (not shown) via a power transmission mechanism such as a toothed belt or chain, and the driving force of the cam 4 provided on the camshaft 2 However, the rocker arm 6 is transmitted to the valve 8 constituting the intake or exhaust valve of the engine, and the valve 8 is operated to open and close the intake and exhaust ports of the combustion chamber.

図２に示すように、ロッカーアーム６は、基端部６ａに嵌合孔１０を有し、基端部６ａから離れた背面に摺動面１２を有している。基端部６ａの嵌合孔１０が、図１に示すロッカーアームシャフト１４に回動自在に支持され、先端部６ｂがタペット７を介してバルブ８のステム部の先端面８ａを押圧している。カム４には、カムシャフト２の径方向に膨出した曲面であるカムノーズ４ａが形成されている。ロッカーアーム６は、摺動面１２においてカム４と摺動することにより、ロッカーアームシャフト１４を支点に揺動して、バルブ８をその軸心方向に移動させることで開閉作動させる。カム４の外周面と摺動面１２とは線接触している。   As shown in FIG. 2, the rocker arm 6 has a fitting hole 10 in the base end portion 6a and a sliding surface 12 on the back surface away from the base end portion 6a. The fitting hole 10 of the base end portion 6 a is rotatably supported by the rocker arm shaft 14 shown in FIG. 1, and the distal end portion 6 b presses the distal end surface 8 a of the stem portion of the valve 8 via the tappet 7. . The cam 4 is formed with a cam nose 4 a which is a curved surface bulging in the radial direction of the cam shaft 2. The rocker arm 6 slides with the cam 4 on the sliding surface 12, swings about the rocker arm shaft 14 as a fulcrum, and opens and closes by moving the valve 8 in the axial direction. The outer peripheral surface of the cam 4 and the sliding surface 12 are in line contact.

図１の左斜め上方から見た斜視図である図３に示すように、摺動面１２のカムシャフト軸方向の幅Ｗ１は、カム４の幅Ｗ２より若干小さく設定されている。カム４およびロッカーアーム６はともに鋼製であり、線接触した状態で、カム４の表面とロッカーアーム６の摺動面１２が高速で擦れ合うので、カム４の表面には摩耗しないようにチル処理や表面硬化熱処理などが施してあり、極めて硬くなっている。   As shown in FIG. 3, which is a perspective view seen from the upper left of FIG. 1, the width W1 of the sliding surface 12 in the camshaft axial direction is set slightly smaller than the width W2 of the cam 4. The cam 4 and the rocker arm 6 are both made of steel, and the surface of the cam 4 and the sliding surface 12 of the rocker arm 6 rub against each other at high speed in a line contact state, so that the surface of the cam 4 is not worn. And surface hardening heat treatment, etc., it is extremely hard.

ロッカーアーム６は鍛造により形成され、カム４との摺動面１２に、耐摩耗性の向上や摺動抵抗の低減を目的として、表面改質が施されている。図４に本実施形態における表面仕上げ方法（研磨方法）の工程を示す。図４に示すように、この表面仕上げ方法は、摺動面１２にクロムめっきを施すめっき工程２０と、摺動面１２を荒研磨する荒研磨工程２２と、摺動面１２をバフ研磨する仕上バフ研磨工程２４とを備えている。なお、図示されていないが、めっき工程２０前に、浸炭、焼入れ、焼き戻し、ショットピーニング等の公知の処理が行われる。   The rocker arm 6 is formed by forging, and a surface modification is applied to the sliding surface 12 with the cam 4 for the purpose of improving wear resistance and reducing sliding resistance. FIG. 4 shows the steps of the surface finishing method (polishing method) in this embodiment. As shown in FIG. 4, the surface finishing method includes a plating step 20 for performing chromium plating on the sliding surface 12, a rough polishing step 22 for rough polishing the sliding surface 12, and a finish for buffing the sliding surface 12. Buff polishing step 24. Although not shown in the figure, known processes such as carburizing, quenching, tempering, and shot peening are performed before the plating step 20.

荒研磨工程２２とは、ある程度の切削力を有する表面仕上手段により摺動面１２を研磨する工程で、該当する表面仕上手段は、例えば荒バフまたはラッピングである。荒バフの例としては、皮製のバフに研磨剤を付着させたものを用いてバフ研磨するものがある。ラッピングの例としては、平面の台上にロッカーアーム６を置き、この台とロッカーアーム６の摺動面１２との間に、表面に研磨材が塗布された走行テープを挟み、ロッカーアーム６の摺動面１２を押し付けた状態で、走行テープを摺動面１２の摺動方向に走らせることにより研磨するものがあり、このラッピングを、例えば目の粗いラップと目の細かいラップにより２段階で行う。目の粗いラップは＃５００〜＃１０００であり、目の細かいラップは＃２０００〜＃３０００である。   The rough polishing step 22 is a step of polishing the sliding surface 12 with surface finishing means having a certain cutting force, and the corresponding surface finishing means is, for example, rough buffing or lapping. Examples of rough buffing include buffing using a leather buff with an abrasive attached. As an example of wrapping, the rocker arm 6 is placed on a flat table, and a running tape having an abrasive coated on the surface is sandwiched between the table and the sliding surface 12 of the rocker arm 6. There is one that is polished by running the running tape in the sliding direction of the sliding surface 12 while the sliding surface 12 is pressed, and this lapping is performed in two stages by, for example, a rough wrap and a fine wrap. Do. The coarse laps are # 500 to # 1000, and the fine laps are # 2000 to # 3000.

仕上バフ研磨工程２４とは、摺動面１２に施されたクロムめっきの鏡面化を行う工程であり、切削機能はほとんどない。仕上バフ研磨としては、布素材のバフに砥粒を付着させたバフ材を用いてバフ研磨するものがある。一例として、図５に示すように、モータにより駆動される回転軸１６に、円盤状のバフ１７を取り付けたバフ研磨機１８を使用し、バフ材１７の外周面１７ａにロッカーアーム６の摺動面１２を押し付けて研磨する。布素材は例えば、麻または綿であり、砥粒は、例えば、酸化クロムまたはアルミナである。   The finish buff polishing step 24 is a step of mirror-finishing the chromium plating applied to the sliding surface 12 and has almost no cutting function. As the finish buff polishing, there is a buff polishing using a buff material in which abrasive grains are adhered to a buff of a cloth material. As an example, as shown in FIG. 5, a buffing machine 18 having a disk-like buff 17 attached to a rotating shaft 16 driven by a motor is used, and the rocker arm 6 slides on the outer peripheral surface 17 a of the buff material 17. The surface 12 is pressed and polished. The cloth material is, for example, hemp or cotton, and the abrasive is, for example, chromium oxide or alumina.

図６は、荒研磨工程２２において荒バフを行い、仕上バフ研磨工程２４において麻製のバフに砥粒を用いたバフ研磨を行って表面仕上げを施した摺動面１２の凹凸を表すグラフである。図６に示すように、摺動面１２の面粗度Ｒｚが０．５μｍ以下であり、摺動面１２における０．１μｍ以上の凹凸の周期Ｔが５０μｍ以上である。面粗度Ｒｚは、好ましくは０．１〜０．５μｍである。面粗度Ｒｚが０．１よりも小さくなると、摩擦力が小さくなり耐摩耗性や摺動抵抗は改善されるが、潤滑油の保持性の低下が懸念される。面粗度Ｒｚが０．５よりも大きいと、磨耗が増大し剥離を生じ易くなるとともに、カム４の磨耗を増大させる。また、面粗度Ｒｚが同程度の値であっても、周期Ｔが小さいと、摺動面１２の凹凸が鋭角となり、カム４の磨耗を増大させることが懸念される。この周期Ｔを５０μｍ以上とすることで、摺動面１２が平滑化される。   FIG. 6 is a graph showing irregularities of the sliding surface 12 in which rough buffing is performed in the rough polishing step 22 and surface finishing is performed by buffing the hemp buff using abrasive grains in the finish buff polishing step 24. is there. As shown in FIG. 6, the surface roughness Rz of the sliding surface 12 is 0.5 μm or less, and the period T of the irregularities of 0.1 μm or more on the sliding surface 12 is 50 μm or more. The surface roughness Rz is preferably 0.1 to 0.5 μm. When the surface roughness Rz is less than 0.1, the frictional force is reduced and the wear resistance and sliding resistance are improved, but there is a concern that the retention of the lubricating oil is lowered. When the surface roughness Rz is larger than 0.5, the wear increases and the peeling easily occurs, and the wear of the cam 4 increases. Further, even if the surface roughness Rz is a similar value, if the period T is small, the unevenness of the sliding surface 12 becomes an acute angle, and there is a concern that the wear of the cam 4 is increased. The sliding surface 12 is smoothed by setting the period T to 50 μm or more.

図７は、荒バフ（荒研磨工程２２）のみを施した摺動面１２の凹凸を表すグラフである。図６と図７を比較すると、荒バフは切削機能をある程度有しているので、図７に示されたように、表面が削られて摺動面１２における０．１μｍ以上の凹凸の周期が５０μｍ未満となっている。その後に、本発明の仕上バフ研磨を行うと、仕上バフ研磨には切削機能がないので、図６に示されたように、表面をさらに深く削ることはなく、表面の凹凸が小さくなり、かつ凹凸の先端が丸くなっており、０．１μｍ以上の凹凸の周期Ｔが５０μｍ以上となる。   FIG. 7 is a graph showing the unevenness of the sliding surface 12 subjected to only rough buffing (rough polishing step 22). Comparing FIG. 6 and FIG. 7, since the rough buff has a cutting function to some extent, as shown in FIG. 7, the surface is shaved and the period of unevenness of 0.1 μm or more on the sliding surface 12 is increased. It is less than 50 μm. Thereafter, when the finish buff polishing of the present invention is performed, the finish buff polishing does not have a cutting function, and therefore, as shown in FIG. The tip of the unevenness is rounded, and the period T of the unevenness of 0.1 μm or more is 50 μm or more.

荒研磨工程２２でクロムめっきにラッピングまたは荒バフを行うと、めっき層のポーラス（孔）が表面に出ることがあり、ポーラスの顕在化により面粗度が大きくなるという問題があるが、仕上バフ研磨工程２４で仕上バフ研磨を行うことにより、ポーラスの目がつぶれて、表面が平滑化される。   When lapping or rough buffing is performed on the chrome plating in the rough polishing step 22, porous (holes) of the plating layer may appear on the surface, and there is a problem that the surface roughness increases due to the manifestation of the porous. By performing final buffing in the polishing step 24, the porous eyes are crushed and the surface is smoothed.

上記構成によれば、クロムめっきを施した摺動面１２に荒バフを行った後に、さらに仕上バフ研磨を行ったことで、ロッカーアーム６におけるカム４との摺動面１２の面粗度Ｒｚが改善され、ロッカーアーム６とカム４との間の摩擦力が低減される結果、摺動面１２の磨耗を抑えることができる。また、面粗度Ｒｚを改善するだけで、ロッカーアーム６の硬さは増大しないので、カム４への影響も抑制できる。   According to the above configuration, the surface roughness Rz of the sliding surface 12 with the cam 4 in the rocker arm 6 is obtained by performing rough buffing on the sliding surface 12 subjected to chrome plating and further performing finish buffing. As a result, the frictional force between the rocker arm 6 and the cam 4 is reduced, so that wear of the sliding surface 12 can be suppressed. Moreover, since the hardness of the rocker arm 6 does not increase only by improving the surface roughness Rz, the influence on the cam 4 can be suppressed.

特に、面粗度Ｒｚを０．５μｍ以下とすることで、潤滑油の保持性能を維持しつつ摩擦力を低減して、摺動面１２の磨耗を効果的に抑えることができる。さらに、摺動面１２における０．１μｍ以上の凹凸の周期Ｔが５０μｍ以上とすることで、ロッカーアーム６の摺動面１２がカム４に影響を与えるのを、すなわちカム４が磨耗するのを効果的に抑制することができる。   In particular, when the surface roughness Rz is 0.5 μm or less, the frictional force can be reduced while maintaining the lubricating oil retention performance, and the wear of the sliding surface 12 can be effectively suppressed. Furthermore, when the period T of the irregularities of 0.1 μm or more on the sliding surface 12 is 50 μm or more, the sliding surface 12 of the rocker arm 6 affects the cam 4, that is, the cam 4 is worn. It can be effectively suppressed.

さらに、仕上バフ研磨工程２４において、麻製のバフを使用することで、面粗度Ｒｚの小さい摺動面１２が容易に得られる。   Furthermore, in the finish buff polishing step 24, the sliding surface 12 having a small surface roughness Rz can be easily obtained by using a hemp buff.

本発明の効果はベンチテストにより実証された。クロムめっきを施した摺動面１２に荒研磨工程２２のみを実行したロッカーアーム６を備えたエンジンと、さらに仕上バフ研磨工程２４を実行したロッカーアーム６を備えたエンジンについて、回転数を低回転域で繰り返して変動させたときのロッカーアーム６の摺動面１２とカム４のカムノーズ４ａの磨耗量を調べた。摺動面１２の磨耗量は目視観察の結果、荒研磨工程２２のみを行ったケースでは、仕上バフ研磨工程２４まで行ったケースに比べて磨耗量が大きい。   The effect of the present invention has been verified by a bench test. The engine is provided with a rocker arm 6 that has performed only the rough polishing step 22 on the chrome-plated sliding surface 12, and the engine that has the rocker arm 6 that has further performed the finish buffing step 24 has a low rotational speed. The amount of wear of the sliding surface 12 of the rocker arm 6 and the cam nose 4a of the cam 4 when it was repeatedly varied in the region was examined. As a result of visual observation, the wear amount of the sliding surface 12 is larger in the case where only the rough polishing step 22 is performed than in the case where the finish buffing step 24 is performed.

また、カム４の磨耗量については、それぞれ４つの試料においての実験結果を示した図８から分かるように、荒研磨工程２２のみ行ったケースでは、摺動面１２の凹凸が大きく、めっき層のポーラスの先端が鋭角であるから、カム４に影響を及ぼし、カムノーズ４ａの磨耗量が進んでいる。これに対し、仕上バフ研磨工程２４まで行ったケースでは、摺動面１２の凹凸が小さく、めっき層のポーラスの先端も丸みを帯びているから、カムノーズ４ａの磨耗量が抑制されている。   As for the wear amount of the cam 4, as can be seen from FIG. 8 showing the experimental results for each of the four samples, in the case where only the rough polishing step 22 was performed, the unevenness of the sliding surface 12 was large, and the plating layer Since the tip of the porous body has an acute angle, the cam 4 is affected and the amount of wear of the cam nose 4a is advanced. On the other hand, in the case where the finishing buffing process 24 is performed, the unevenness of the sliding surface 12 is small and the porous tip of the plating layer is rounded, so that the wear amount of the cam nose 4a is suppressed.

なお、ロッカーアーム６におけるめっき層はカム４との摺動面１２以外にも施してよく、また上記研磨方法をカム４の摺動面に施してもよい。   In addition, the plating layer in the rocker arm 6 may be applied to other than the sliding surface 12 with the cam 4, and the above polishing method may be applied to the sliding surface of the cam 4.

以上のとおり、図面を参照しながら本発明の好適な実施形態を説明したが、本発明の趣旨を逸脱しない範囲内で、種々の追加、変更または削除が可能である。したがって、そのようなものも本発明の範囲内に含まれる。   As described above, the preferred embodiments of the present invention have been described with reference to the drawings, but various additions, modifications, or deletions can be made without departing from the spirit of the present invention. Therefore, such a thing is also included in the scope of the present invention.

本発明の一実施形態に係るロッカーアームを備えたエンジンの動弁系を示す側面図である。It is a side view showing a valve operating system of an engine provided with a rocker arm concerning one embodiment of the present invention. 同ロッカーアームの斜視図である。It is a perspective view of the rocker arm. 図１の左斜め上方から見た斜視図である。It is the perspective view seen from the diagonally upper left of FIG. 本発明の一実施形態に係るロッカーアームの表面仕上げ方法の工程を示すフロー図である。It is a flowchart which shows the process of the surface finishing method of the rocker arm which concerns on one Embodiment of this invention. 同表面仕上げ方法の仕上バフ研磨の一例を示す斜視図である。It is a perspective view which shows an example of the finishing buffing of the surface finishing method. 同ロッカーアームの摺動面の凹凸を表すグラフである。It is a graph showing the unevenness | corrugation of the sliding surface of the rocker arm. 同ロッカーアームにおける仕上研磨を施す前の摺動面の凹凸を表すグラフである。It is a graph showing the unevenness | corrugation of the sliding surface before performing finish grinding | polishing in the rocker arm. 同ロッカーアームを用いたエンジンのカムの磨耗量を表すグラフである。It is a graph showing the amount of wear of the cam of the engine using the rocker arm.

符号の説明Explanation of symbols

４ カム
６ ロッカーアーム
８ バルブ
１２ 摺動面
２０ めっき工程
２２ 荒研磨工程
２４ 仕上バフ研磨工程
Ｔ 周期 4 Cam 6 Rocker arm 8 Valve 12 Sliding surface 20 Plating step 22 Rough polishing step 24 Finish buffing step T Period

Claims (3)

エンジンの回転軸に連動したカムとの摺動により駆動されて吸気または排気弁を作動させるロッカーアームの研磨仕上げ方法であって、
ロッカーアームにおける少なくとも前記カムとの摺動面にクロムめっきを施すめっき工程と、
荒バフまたはラッピングにより前記摺動面を荒研磨する荒研磨工程と、
布素材のバフに砥粒を付着させたバフ材を用いて前記摺動面をバフ研磨する仕上バフ研磨工程と、
を備えたロッカーアームの研磨仕上げ方法。 A method of polishing and finishing a rocker arm that is driven by sliding with a cam linked to an engine rotation shaft to operate an intake or exhaust valve,
A plating step of applying chromium plating to at least a sliding surface of the rocker arm with the cam;
A rough polishing step of rough polishing the sliding surface by rough buffing or lapping;
A finishing buffing step of buffing the sliding surface using a buff material in which abrasive grains are attached to a buff of a cloth material;
Polishing method for rocker arm equipped with 請求項１において、前記布素材は麻であるロッカーアームの仕上げ方法。   The method for finishing a rocker arm according to claim 1, wherein the cloth material is hemp. エンジンの回転軸に連動したカムとの摺動により駆動されて吸気または排気弁を作動させるロッカーアームであって、
荒研磨と仕上バフ研磨により、前記ロッカーアームにおける少なくとも前記カムとの摺動面の面粗度Ｒｚが０．５μｍ以下であり、かつ前記摺動面における０．１μｍ以上の凹凸の周期が５０μｍ以上であるロッカーアーム。 A rocker arm that is driven by sliding with a cam linked to the rotation shaft of an engine to operate an intake or exhaust valve,
By rough polishing and finish buffing, the surface roughness Rz of at least the sliding surface of the rocker arm with the cam is 0.5 μm or less, and the period of irregularities of 0.1 μm or more on the sliding surface is 50 μm or more. Rocker arm that is.
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Cited By (2)

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CN102128063A (en) * 2011-03-19 2011-07-20 重庆长安汽车股份有限公司 Integral air inlet rocker arm
WO2012081198A1 (en) 2010-12-13 2012-06-21 川崎重工業株式会社 Drive cam and valve operating device for engine

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JPH06137404A (en) * 1992-10-23 1994-05-17 Sumitomo Electric Ind Ltd Cam follower and its manufacture
JPH09177515A (en) * 1995-12-26 1997-07-08 Kawasaki Heavy Ind Ltd Sliding plane and its surface treating method
JP2004332896A (en) * 2003-05-12 2004-11-25 Koyo Seiko Co Ltd Roller for cam follower
JP2007075948A (en) * 2005-09-14 2007-03-29 Mitsubishi Heavy Ind Ltd Abrasive disc, its manufacturing method, and lapping device and its method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55112763A (en) * 1979-02-15 1980-08-30 Taiheiyo Kogyo Kk Buffing wheel pressurizing mechanism for buffing device
JPH06137404A (en) * 1992-10-23 1994-05-17 Sumitomo Electric Ind Ltd Cam follower and its manufacture
JPH09177515A (en) * 1995-12-26 1997-07-08 Kawasaki Heavy Ind Ltd Sliding plane and its surface treating method
JP2004332896A (en) * 2003-05-12 2004-11-25 Koyo Seiko Co Ltd Roller for cam follower
JP2007075948A (en) * 2005-09-14 2007-03-29 Mitsubishi Heavy Ind Ltd Abrasive disc, its manufacturing method, and lapping device and its method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012081198A1 (en) 2010-12-13 2012-06-21 川崎重工業株式会社 Drive cam and valve operating device for engine
JP5898092B2 (en) * 2010-12-13 2016-04-06 川崎重工業株式会社 DRIVE CAM, MANUFACTURING METHOD THEREOF AND ENGINE VALVE DEVICE
CN102128063A (en) * 2011-03-19 2011-07-20 重庆长安汽车股份有限公司 Integral air inlet rocker arm

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