JP2005090714A

JP2005090714A - Cam follower

Info

Publication number: JP2005090714A
Application number: JP2003328618A
Authority: JP
Inventors: Yoshitaka Waseda; 義孝早稲田; Nobutsuna Motohashi; 信綱本橋
Original assignee: Koyo Seiko Co Ltd
Current assignee: Koyo Seiko Co Ltd
Priority date: 2003-09-19
Filing date: 2003-09-19
Publication date: 2005-04-07

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize the rolling motion of a roller 6 in a cam follower 2, in which both ends 4a, 4b of a spindel 4 are inserted to strike and caulk into shaft holes 7a, 8a in opposite side walls 7, 8. <P>SOLUTION: The cam follower is formed to set to ≥300Hv and ≤350Hv for 2 to 4 mm of thickness of a pair of side walls 7, 8 at both ends 4a, 4b of the spindle 4 before striking and caulking. While this makes it possible to position both the ends 4a, 4b of the spindle 4 into each shaft hole 7a, 8a in the axial direction and the circumferential direction by striking and caulking on both ends 4a, 4b of the spindle 4, the region exposed inwardly in the axial direction from an inside surface of the opposite side walls 7, 8 is suppressed or prevented from plastically deforming at the spindle. As a result, a contact condition of the roller 7 for the spindle 4 is refined. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、カムフォロアに関する。このカムフォロアは、例えば、自動車等のエンジン動弁機構やその他の各種のカム機構等に用いられる。 The present invention relates to a cam follower. This cam follower is used for, for example, an engine valve mechanism of an automobile or other various cam mechanisms.

カムフォロアは、一対の対向側壁間に架け渡された金属製の支軸に、ローラを回転自在に外装した構成であり、回転するカムがローラの外周面に当接されることで、カムフォロア全体を所定方向に往復変位させるようになっている。支軸は、その両端部が両対向側壁に同軸に設けられた各軸孔に挿入され打刻かしめされることにより軸孔外端縁にかしめ固定される。このようなかしめを容易確実に行ううえで、支軸の両端部の硬度は、２００Ｈｖ以上２８０Ｈｖ以下と低く軟質に設定されている。この支軸両端部の硬度と比較して、両対向側壁間の支軸部分はころ転走面となるから硬度６９７Ｈｖ以上８３２Ｈｖ以下と高く硬質に設定されている（例えば特許文献１参照）。
特開平５−３２１６１６号公報（全頁、全図） The cam follower has a structure in which a roller is rotatably mounted on a metal support shaft spanned between a pair of opposing side walls, and the rotating cam is brought into contact with the outer peripheral surface of the roller so that the entire cam follower is It is designed to be reciprocated in a predetermined direction. Both ends of the support shaft are caulked and fixed to the outer end edge of the shaft hole by being inserted and stamped into the respective shaft holes provided coaxially on both opposing side walls. In order to perform such caulking easily and surely, the hardness of both end portions of the support shaft is set to be as soft as 200 Hv or more and 280 Hv or less. Compared with the hardness of the both ends of the support shaft, the support shaft portion between the opposite side walls is a roller rolling surface, so the hardness is set as high as 697 Hv or more and 832 Hv or less (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 5-321616 (all pages, all figures)

上記従来例では、カムフォロアの軽量化目的から対向側壁をプレス加工品としてその板厚が２ｍｍないし４ｍｍ程度に極めて薄肉になると、支軸の両端部が軟質なために、打刻かしめによる支軸の塑性変形が、軸孔内に位置する支軸の両端部にとどまらず、対向側壁の内側面よりも軸方向内側に露出している支軸領域（露出支軸領域）にまで及んで、ころ転走面におけるころの転がり動作に悪影響を及ぼしてくるようになる。そのため、従来では、ころ両端部にクラウニングを付けることによってころ両端部を露出支軸領域に非接触にして、ころの転動動作に影響を及ばさないようにしていた。しかしながら、ころ両端部に対するクラウニングの形成には高い加工精度が要求されるなど、カムフォロアの製造コストを増大させる要因となるなどの課題があった。 In the above conventional example, for the purpose of reducing the weight of the cam follower, if the opposite side wall is a press-processed product and the plate thickness becomes extremely thin to about 2 mm to 4 mm, both ends of the support shaft are soft. The plastic deformation does not stop at both ends of the support shaft located in the shaft hole, but extends to the support shaft region (exposed support shaft region) exposed to the inner side in the axial direction from the inner surface of the opposite side wall. This will adversely affect the rolling action of the rollers on the running surface. For this reason, conventionally, both ends of the roller are brought into non-contact with the exposed spindle region by applying crowning to both ends of the roller so as not to affect the rolling operation of the roller. However, there is a problem that the formation of the crowning on both ends of the roller requires a high machining accuracy, which increases the manufacturing cost of the cam follower.

本発明によるカムフォロアは、金属製の支軸の両端部が一対の対向側壁に同軸に設けられた軸孔それぞれに挿入されて打刻かしめされるカムフォロアであって、当該支軸の両端部それぞれの打刻かしめ前の硬度が両対向側壁それぞれの板厚２ｍｍないし４ｍｍに対して、ビッカース硬さで３００Ｈｖ以上、３５０Ｈｖ以下に設定されていることを特徴としているものである。 A cam follower according to the present invention is a cam follower in which both end portions of a metal support shaft are inserted and stamped into shaft holes provided coaxially on a pair of opposing side walls, respectively. The hardness before stamping is characterized in that the Vickers hardness is set to 300 Hv or more and 350 Hv or less with respect to the plate thicknesses of 2 mm to 4 mm of both opposing side walls.

この構成では、支軸の両端部の硬度が打刻かしめ前としては３００Ｈｖ以上と高く比較的硬質に設定されているので、支軸の端面に対し打刻かしめをすると、支軸の両端部において打刻かしめ位置に近い軸孔内周面の外端縁側では径方向外側への膨張量（支軸の母線形状の変形量）が大きくても、軸孔の内端縁側ではその膨張量が小さくなっている。その結果、両対向側壁の板厚が２ｍｍないし４ｍｍと薄肉であっても、対向側壁の内側面よりも軸方向内側に露出する露出支軸領域にまで打刻かしめの影響が及ばないようになる。 In this configuration, the hardness of the both ends of the support shaft is set to be relatively hard as 300 Hv or more before being stamped. Therefore, when stamping is performed on the end surface of the support shaft, Even if the amount of expansion radially outward (the amount of deformation of the bus bar shape of the support shaft) is large on the outer edge side of the inner peripheral surface of the shaft hole close to the stamping position, the amount of expansion is small on the inner edge side of the shaft hole. It has become. As a result, even if the plate thickness of both opposing side walls is as thin as 2 mm to 4 mm, the influence of stamping does not reach the exposed spindle region exposed to the inner side in the axial direction than the inner side surface of the opposing side wall. .

そのため、本発明では、両対向側壁それぞれの板厚が２ｍｍないし４ｍｍと極めて薄肉であっても、露出支軸領域の塑性変形量を抑制ないしは防止できるものとなり、ころの端部にクラウニングを付けず、支軸ところとの接触面積を増大させることができ、これによって支軸ところの接触状態を良好にして転動性能を向上できる。 Therefore, in the present invention, even if the thickness of each of the opposing side walls is as thin as 2 mm to 4 mm, the amount of plastic deformation in the exposed support shaft region can be suppressed or prevented, and no crowning is applied to the end of the roller. In addition, the contact area with the support shaft can be increased, whereby the contact state with the support shaft is improved and the rolling performance can be improved.

同時にまた、本発明では、支軸の両端部の硬度を打刻かしめ前で３５０Ｈｖ以下に設定されて、それほど高い硬質には設定されていないから、打刻かしめによる支軸の両端部の塑性変形量を必要程度に確保して支軸の両端部を軸孔に圧接させて軸方向ならびに周方向にその位置決めを図れるものである。 At the same time, in the present invention, the hardness of the both ends of the support shaft is set to 350 Hv or less before the stamping, and is not set to a very high hardness. By securing the amount to a necessary level, both ends of the support shaft can be pressed against the shaft hole, and the positioning can be achieved in the axial direction and the circumferential direction.

以上により、本発明では、支軸の両端部に対して、露出支軸領域にまで打刻かしめの影響を及ばさない範囲で打刻かしめを容易に行えるから、カムフォロアの製造コストに影響をさせず、高い性能のカムフォロアを提供できるものとなる。 As described above, according to the present invention, since both the end portions of the support shaft can be easily stamped within a range that does not affect the exposed support shaft region, the manufacturing cost of the cam follower is affected. Therefore, a cam follower with high performance can be provided.

上記支軸は、好ましくは、その母材にビッカース硬さ３００Ｈｖ未満に調質された線状鋼材を用いるとともに、その両端部の上記硬度を、ヘッダ加工に次いで研削加工されたことによる加工硬化により設定する。 The support shaft preferably uses a linear steel material tempered to a Vickers hardness of less than 300 Hv as its base material, and the hardness at both ends thereof is obtained by work hardening by grinding following header processing. Set.

このような場合では、支軸の両端部の硬度をその加工硬化で調整できることにより、支軸の両端部の硬度を別途の工程で設定する必要がなくなり、支軸の両端部の硬度設定のために余分なコストがかからずに済んで好ましい。また、このような加工硬化による場合、支軸の両端部の表層が硬化しているものの、両端部の内部が金属母材の硬度のまま軟質に保たれているから、打刻かしめによって起こる所定の塑性変形、つまり支軸の軸方向ならびに周方向の位置決めに必要な塑性変形が容易に行えるようになり、しかも、支軸において対向側壁の内側面よりも軸方向内側に露出している領域に塑性変形が発生することが抑制または防止されるという効果もある。 In such a case, the hardness of both ends of the support shaft can be adjusted by the work hardening, so that it is not necessary to set the hardness of both ends of the support shaft in a separate process. This is preferable because no extra cost is required. Further, in the case of such work hardening, the surface layer at both ends of the support shaft is hardened, but the inside of both ends is kept soft with the hardness of the metal base material, so that the predetermined caused by stamping is performed. Plastic deformation, that is, plastic deformation necessary for axial and circumferential positioning of the support shaft can be easily performed, and in the region exposed on the support shaft inward in the axial direction from the inner side surface of the opposite side wall. There is also an effect that the occurrence of plastic deformation is suppressed or prevented.

本発明では、対向側壁の軸孔に対する支軸の両端部の打刻かしめの影響をなくすために、ころにクラウニング加工を施す必要がなくなる。 In the present invention, it is not necessary to perform crowning on the rollers in order to eliminate the influence of stamping of both ends of the support shaft with respect to the shaft hole in the opposite side wall.

図面を参照して本発明による最良の形態のカムフォロアを説明する。図１はカムフォロアの断面図、図２は、カムフォロアの支軸をその一端面側から見た図を示す。これらの図において、符号１はカム、２はカムフォロアを示す。 A best mode cam follower according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a cam follower, and FIG. 2 is a view of a support shaft of the cam follower as viewed from one end face side. In these drawings, reference numeral 1 denotes a cam, and 2 denotes a cam follower.

カムフォロア２は、胴体３、支軸４、ローラ５、および複数のころ６を備える。胴体３は、ほぼ平行な一対の対向側壁７，８を有している。支軸４は対向側壁７，８間に架け渡されている。ローラ５は、支軸４において対向側壁７，８間の領域に複数のころ６を介して回転自在に外装されている。ころ６は、単に両端縁が面取されただけの形状であり、クラウニングが施されていない。対向側壁７，８には、板厚方向に貫通する軸孔７ａ，８ａが同軸に設けられ、軸孔７ａ，８ａの外端には外側へ向けて拡径する面取７ｂ，８ｂが設けられている。 The cam follower 2 includes a body 3, a support shaft 4, a roller 5, and a plurality of rollers 6. The body 3 has a pair of opposed side walls 7 and 8 that are substantially parallel. The support shaft 4 is bridged between the opposite side walls 7 and 8. The roller 5 is rotatably mounted on the support shaft 4 in a region between the opposing side walls 7 and 8 via a plurality of rollers 6. The roller 6 has a shape in which both end edges are simply chamfered and is not crowned. The opposing side walls 7 and 8 are coaxially provided with shaft holes 7a and 8a penetrating in the plate thickness direction, and chamfers 7b and 8b are formed at the outer ends of the shaft holes 7a and 8a. ing.

支軸４の両端部４ａ，４ｂは、軸孔７ａ，８ａに、すきま嵌めにより挿入され、かつ、打刻かしめを施されており、これによって支軸４は対向側壁７，８間に軸方向ならびに周方向に位置決めされている。この打刻かしめにより、支軸４の一端側と他端側それぞれの端面に、支軸４の中心軸線Ｏと同心の環状溝１５，１５が形成される。環状溝１５，１５の形成の際、環状溝１５，１５に存在していた金属が塑性流動することに伴い、支軸４の両端側それぞれの外周に径方向外向きに突出するようにかしめ部１６，１６が形成されるとともに、かしめ部１６，１６よりも軸方向内側領域が径方向外向きに膨張する。 Both end portions 4a and 4b of the support shaft 4 are inserted into the shaft holes 7a and 8a by clearance fitting and subjected to stamping, whereby the support shaft 4 is axially disposed between the opposing side walls 7 and 8. In addition, it is positioned in the circumferential direction. By this stamping, annular grooves 15 and 15 concentric with the central axis O of the support shaft 4 are formed on the end surfaces of the support shaft 4 at one end side and the other end side, respectively. When the annular grooves 15 and 15 are formed, the caulking portion protrudes radially outward on the outer circumferences of both ends of the support shaft 4 as the metal existing in the annular grooves 15 and 15 plastically flows. 16 and 16 are formed, and the axially inner region expands radially outward from the caulking portions 16 and 16.

例えばカムフォロア２を軽量化する目的より、胴体３を例えばクロムモリブデン鋼材などの鋼材をプレス加工して製作する場合、対向側壁７，８の板厚を２ｍｍないし４ｍｍと薄肉にすることが可能である。胴体３の素材としては前述した鋼材に限定されない。 For example, in order to reduce the weight of the cam follower 2, when the body 3 is manufactured by pressing a steel material such as a chrome molybdenum steel material, the thickness of the opposing side walls 7 and 8 can be reduced to 2 mm to 4 mm. . The material of the body 3 is not limited to the steel material described above.

このような場合、支軸４の両端部４ａ、４ｂそれぞれに打刻かしめが行われると、この打刻かしめに伴う塑性変形がころ転走面４ｃにまで発生しやすいことを考慮して、支軸４の特に両端部４ａ，４ｂそれぞれの硬度は、種々に設定され、これにより、前記塑性変形は抑制ないしは防止されるので、以下で説明する。 In such a case, considering that the both ends 4a and 4b of the support shaft 4 are stamped, the plastic deformation accompanying the stamping is likely to occur up to the roller rolling surface 4c. The hardness of each of the end portions 4a and 4b of the shaft 4 is set in various ways, whereby the plastic deformation is suppressed or prevented, and will be described below.

支軸４は、その母材に、例えば高炭素クロム軸受鋼、浸炭鋼などの金属が用いられる。支軸４において対向側壁７，８の各軸孔７ａ，８ａ内に挿入される両端部４ａ，４ｂの打刻かしめ前の硬度は、対向側壁７，８の板厚の２ｍｍないし４ｍｍに対して、ビッカース硬さ３００Ｈｖ以上、３５０Ｈｖ以下である。また、支軸４の両端部４ａ，４ｂの硬度は、上記に限定されず、例えば、対向側壁７，８の板厚の２ｍｍないし４ｍｍに対して、３１０Ｈｖ以上、３２０Ｈｖ以下に設定してもよい。また、対向側壁７，８の板厚は、より薄肉でもよく、例えば、上限値が３ｍｍでもよい。 The support shaft 4 is made of a metal such as high carbon chrome bearing steel or carburized steel. In the support shaft 4, the hardness before stamping of both end portions 4 a and 4 b inserted into the shaft holes 7 a and 8 a of the opposite side walls 7 and 8 is 2 mm to 4 mm of the thickness of the opposite side walls 7 and 8. Vickers hardness is 300 Hv or more and 350 Hv or less. Further, the hardness of both end portions 4a and 4b of the support shaft 4 is not limited to the above, and may be set to 310 Hv or more and 320 Hv or less with respect to 2 mm to 4 mm of the plate thickness of the opposing side walls 7 and 8, for example. . Moreover, the plate | board thickness of the opposing side walls 7 and 8 may be thinner, for example, an upper limit may be 3 mm.

ここで、支軸４の一端部４ａは、支軸４の一端面から一方の対向側壁７の内側面までの範囲内に相当し、同他端部４ｂは支軸４の他端面から他方の対向側壁８の内側面までの範囲内に相当する。 Here, the one end portion 4 a of the support shaft 4 corresponds to a range from one end surface of the support shaft 4 to the inner surface of one opposing side wall 7, and the other end portion 4 b extends from the other end surface of the support shaft 4 to the other end surface. This corresponds to the range up to the inner surface of the opposing side wall 8.

支軸４の両端部４ａ，４ｂの打刻かしめ前の硬度が、下限の３００Ｈｖ未満に設定されると、支軸４において対向側壁７，８の内側面よりも軸方向内側に露出している支軸領域（露出支軸領域）に打刻かしめに伴う塑性変形量が大きくなりすぎ、ころ６にクラウニングを付ける必要が生じてくる。支軸４の両端部４ａ，４ｂの打刻かしめ前の硬度が、上限の３５０Ｈｖを超えて設定されると、打刻かしめによる塑性変形が不足して軸方向ならびに周方向の位置決めが不十分となるなど、打刻かしめ作業が困難になってくる。 When the hardness before stamping of both ends 4a and 4b of the support shaft 4 is set to be lower than the lower limit of 300 Hv, the support shaft 4 is exposed to the inner side in the axial direction than the inner surfaces of the opposing side walls 7 and 8. The amount of plastic deformation accompanying the stamping becomes too large in the support shaft region (exposed support shaft region), and it becomes necessary to crown the rollers 6. When the hardness before stamping of both ends 4a and 4b of the support shaft 4 is set to exceed the upper limit of 350 Hv, the plastic deformation due to stamping is insufficient and the axial and circumferential positioning is insufficient. For example, the stamping work becomes difficult.

支軸４のころ転走面４ｃの硬度は、耐摩耗性などを考慮して、ビッカース硬さ７００Ｈｖ以上に設定されることが好ましい。 The hardness of the roller rolling surface 4c of the support shaft 4 is preferably set to a Vickers hardness of 700 Hv or more in consideration of wear resistance and the like.

支軸４の製法を具体的に説明する。支軸４の母材に３００Ｈｖ未満に調質された高炭素クロム軸受鋼からなるコイル材を用いる。このコイル材を支軸４の長さに切断する。切断して得た支軸材の両端部をヘッダ加工（冷間鍛造加工等）により成型するとともに研削加工する。この後、支軸材のころ転走面４ｃに相当する軸方向中間領域のみを高周波焼入れ等により硬化処理してから外周面を研磨して支軸４が得られる。支軸４の両端部４ａ，４ｂは、ヘッダ加工、さらに、その後の研削加工により加工硬化して３００Ｈｖ以上、３５０Ｈｖ以下になる。 The manufacturing method of the support shaft 4 will be specifically described. A coil material made of high carbon chromium bearing steel tempered to less than 300 Hv is used for the base material of the support shaft 4. The coil material is cut to the length of the support shaft 4. Both ends of the support shaft material obtained by cutting are molded by header processing (cold forging or the like) and ground. Thereafter, only the intermediate region in the axial direction corresponding to the roller rolling surface 4c of the support shaft material is hardened by induction hardening or the like, and then the outer peripheral surface is polished to obtain the support shaft 4. Both end portions 4a and 4b of the support shaft 4 are processed and hardened by header processing and further grinding processing to be 300Hv or more and 350Hv or less.

このように、支軸４の両端部４ａ、４ｂの硬度は従来例よりも硬くする方向で特定の数値範囲に設定されるので、支軸４の両端部４ａ、４ｂに打刻かしめが施されると、その両端部４ａ、４ｂは対向側壁７，８の各軸孔７ａ，８ａそれぞれに軸方向と周方向に位置決めされ、しかも、打刻かしめが施されることによって、支軸４において対向側壁７，８の内側面よりも軸方向内側に露出している支軸領域の塑性変形は、抑制ないし防止される。これにより、支軸４ところ６との接触状態が良好になってころ６にクラウニング加工を施す必要がなくなる。 Thus, since the hardness of the both ends 4a and 4b of the support shaft 4 is set to a specific numerical range in the direction of making it harder than the conventional example, the both ends 4a and 4b of the support shaft 4 are stamped. Then, both end portions 4a and 4b are positioned in the axial direction and the circumferential direction in the respective shaft holes 7a and 8a of the opposite side walls 7 and 8, and are opposed to each other on the support shaft 4 by being stamped. Plastic deformation of the support shaft region exposed to the inner side in the axial direction than the inner surfaces of the side walls 7 and 8 is suppressed or prevented. As a result, the contact state between the support shafts 4 and 6 becomes good, and the roller 6 need not be subjected to crowning.

図３を参照して、支軸４の両端部４ａ、４ｂの硬度と、打刻かしめに伴う支軸４の母線形状の変形量との関係を説明する。 With reference to FIG. 3, the relationship between the hardness of the both ends 4a and 4b of the support shaft 4 and the amount of deformation of the bus bar shape of the support shaft 4 accompanying the stamping will be described.

図３は、支軸４の両端部４ａ、４ｂの打刻かしめ前の硬度が、２９０Ｈｖ以下に設定された場合、露出支軸領域に母線変形量で０．５μｍの膨張が発生し、２９０Ｈｖ超、３００Ｈｖ未満の範囲に設定された場合、その膨張が急速に小さくなり、３００Ｈｖ以上に設定された場合、その膨張が発生しないことを示している。このことから、支軸４の両端部４ａ、４ｂの打刻かしめ前の硬度の下限値は３００Ｈｖに設定される。 FIG. 3 shows that when the hardness before stamping of both ends 4a and 4b of the support shaft 4 is set to 290 Hv or less, the exposed support shaft region expands by 0.5 μm in terms of the amount of busbar deformation, and exceeds 290 Hv. When the range is set to less than 300 Hv, the expansion rapidly decreases, and when the range is set to 300 Hv or more, the expansion does not occur. For this reason, the lower limit value of the hardness before stamping of the both end portions 4a and 4b of the support shaft 4 is set to 300 Hv.

以下、本発明の他の実施形態を説明する。 Hereinafter, other embodiments of the present invention will be described.

上述したカムフォロア２は、例えば図４や図５に示すように、自動車などのエンジン動弁機構のロッカーアーム２０，３０に用いることができる。もちろん、これらのロッカーアーム２０，３０以外のロッカーアームや、その他のいろいろなカム機構にも上記カムフォロア２を用いることができる。 The cam follower 2 described above can be used for rocker arms 20 and 30 of an engine valve mechanism such as an automobile, for example, as shown in FIGS. Of course, the cam follower 2 can be used for a rocker arm other than the rocker arms 20 and 30 and various other cam mechanisms.

図４に示すロッカーアーム２０は、センタピボットタイプと呼ばれるものであり、プレス製の胴体３の長手方向一端に上記カムフォロア２が設けられ、長手方向中間にロッカシャフト２１が貫通され、さらに長手方向他端にアジャストスクリュー２２が螺合装着される。上記アジャストスクリュー２２に、不図示のシリンダヘッドに設置される動弁機構のバルブ４０のステムエンドが当接される。動作は、カム１の回転に伴いロッカシャフト２１が支点となって胴体３が傾動されて、アジャストスクリュー２２が上下方向に反復変位させられることで、バルブ４０を開閉動作させる。 The rocker arm 20 shown in FIG. 4 is called a center pivot type. The cam follower 2 is provided at one end in the longitudinal direction of the press-made body 3, the rocker shaft 21 is penetrated in the middle in the longitudinal direction, and the other in the longitudinal direction. An adjustment screw 22 is screwed to the end. A stem end of a valve 40 of a valve mechanism installed in a cylinder head (not shown) is brought into contact with the adjustment screw 22. As the cam 1 rotates, the body 3 is tilted with the rocker shaft 21 as a fulcrum, and the adjusting screw 22 is repeatedly displaced in the vertical direction to open and close the valve 40.

図５に示すロッカーアーム３０は、エンドピボッドタイプと呼ばれるものであり、プレス製の胴体３の長手方向中間に上記カムフォロア２が設けられ、長手方向一端にバルブ嵌入部３１が、さらに長手方向他端に上向き半球形のピボット部３２がそれぞれ設けられる。このピボット部３２は、不図示のシリンダヘッドに設置されるラッシュアジャスタ４１の上端に係合される。動作は、カム１の回転に伴いピボット部３２が支点となって胴体３が傾動されて、バルブ嵌入部３１が上下方向に反復変位させられることで、バルブ４０を開閉動作させる。 The rocker arm 30 shown in FIG. 5 is called an end pivot type. The cam follower 2 is provided in the middle of the press body 3 in the longitudinal direction, and a valve insertion portion 31 is further provided at one end in the longitudinal direction. An upward hemispherical pivot portion 32 is provided at each end. The pivot portion 32 is engaged with an upper end of a lash adjuster 41 installed on a cylinder head (not shown). As the cam 1 rotates, the body 3 is tilted with the pivot portion 32 serving as a fulcrum, and the valve insertion portion 31 is repeatedly displaced in the vertical direction to open and close the valve 40.

これらのロッカーアーム２０，３０は、エンジンのシリンダヘッドに設置されるものであるが、上述したような支軸４の構成によって、カム１とローラ５とのミスアライメント（心ずれ）を抑制または防止できるので、バルブの開閉動作を安定にするうえで有利となる。 These rocker arms 20 and 30 are installed in the cylinder head of the engine, but the configuration of the support shaft 4 as described above suppresses or prevents misalignment (center misalignment) between the cam 1 and the roller 5. This is advantageous for stabilizing the opening and closing operation of the valve.

本発明のカムフォロアは、自動車等のエンジン動弁機構やその他の各種のカム機構等に利用できる。 The cam follower of the present invention can be used for an engine valve mechanism for automobiles and other various cam mechanisms.

本発明の最良の形態に係るカムフォロアを示す断面図Sectional drawing which shows the cam follower which concerns on the best form of this invention 図１の支軸をその一端面側から見た図The figure which looked at the spindle of Drawing 1 from the end surface side 図１における支軸の端部の硬度と変形との関係を示す図The figure which shows the relationship between the hardness of the edge part of the spindle in FIG. 1, and a deformation | transformation. 本発明によるカムフォロアの使用用途の一例を示す側面図The side view which shows an example of the use application of the cam follower by this invention 本発明によるカムフォロアの使用用途の一例を示す側面図The side view which shows an example of the use application of the cam follower by this invention

符号の説明Explanation of symbols

４支軸
４ａ、４ｂ支軸の各端部
４ｃ支軸のころ転走面
５ローラ
６ころ
７、８対向側壁 4 Support shaft 4a, 4b Each end of support shaft 4c Roller rolling surface of support shaft 5 Roller 6 Roller 7, 8 Opposite side wall

Claims

金属製の支軸の両端部が、一対の対向側壁に同軸に設けられた軸孔それぞれに挿入されたうえで打刻かしめされるカムフォロアであって、当該支軸の両端部それぞれの打刻かしめ前の硬度が、両対向側壁それぞれの板厚２ｍｍないし４ｍｍに対して、ビッカース硬さ３００Ｈｖ以上、３５０Ｈｖ以下に設定されている、ことを特徴とするカムフォロア。 A cam follower in which both ends of a metal support shaft are inserted into shaft holes provided coaxially on a pair of opposing side walls and stamped, and the both ends of the support shaft are stamped. A cam follower characterized in that the previous hardness is set to a Vickers hardness of 300 Hv or more and 350 Hv or less with respect to a plate thickness of 2 mm to 4 mm of both opposing side walls.