JPH06229456A - Cam-follower device - Google Patents

Cam-follower device

Info

Publication number
JPH06229456A
JPH06229456A JP1460493A JP1460493A JPH06229456A JP H06229456 A JPH06229456 A JP H06229456A JP 1460493 A JP1460493 A JP 1460493A JP 1460493 A JP1460493 A JP 1460493A JP H06229456 A JPH06229456 A JP H06229456A
Authority
JP
Japan
Prior art keywords
roller
ceramics
follower device
diameter side
end surfaces
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
JP1460493A
Other languages
Japanese (ja)
Inventor
Kazuhisa Kitamura
和久 北村
Hiroaki Takebayashi
博明 竹林
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.)
Koyo Seiko Co Ltd
Original Assignee
Koyo Seiko 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 Koyo Seiko Co Ltd filed Critical Koyo Seiko Co Ltd
Priority to JP1460493A priority Critical patent/JPH06229456A/en
Publication of JPH06229456A publication Critical patent/JPH06229456A/en
Pending legal-status Critical Current

Links

Landscapes

  • Valve-Gear Or Valve Arrangements (AREA)
  • Gears, Cams (AREA)

Abstract

PURPOSE:To embody the possible minimum cost in forming the roller of a cam follower device by ceramics. CONSTITUTION:A ceramics-made roller 54 is externally fitted around the axial intermediate part of a shaft 56 fixedly stretched between a pair of arms 55, 55 through a small clearance so as to be turned freely. Recessed parts 57, 57 recessed so as to be inclined axially inward from the outside diameter side to the inside diameter side are provided on both end surfaces of this roller 54, and the end surfaces including the recessed parts 57, 57 are made unpolished rough surfaces. Thereby, the material cost of the ceramics-made roller 54 and the processing cost accompanying end surface polishing can be reduced.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、例えばエンジンの動弁
機構であるロッカーアームやバルブリフターなどに用い
られるカムフォロワ装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cam follower device used in, for example, a rocker arm or a valve lifter which is a valve train of an engine.

【0002】[0002]

【従来の技術】オーバーヘッドカムシャフト(OHC)
型式の動弁機構の一般的な例を図3に示している。図
中、50はロッカーアーム、51はカムシャフト、52
はカム、53はバルブのステム、54はローラである。
2. Description of the Related Art Overhead camshaft (OHC)
A typical example of a type of valve mechanism is shown in FIG. In the figure, 50 is a rocker arm, 51 is a camshaft, 52
Is a cam, 53 is a valve stem, and 54 is a roller.

【0003】ローラ54は、図4に示すように、ロッカ
アーム50の一端の二つ一対のアーム55,55間に固
定的に架設された軸56の軸方向中間部位に回動自在と
なるようにわずかな隙間を介して外嵌されている。な
お、軸56とローラ54との間には転がり軸受やすべり
軸受を介装するものもある。
As shown in FIG. 4, the roller 54 is rotatable about an axially intermediate portion of a shaft 56 fixedly provided between two pairs of arms 55, 55 at one end of the rocker arm 50. It is fitted over a slight gap. Note that there is a roller bearing or a sliding bearing interposed between the shaft 56 and the roller 54.

【0004】[0004]

【発明が解決しようとする課題】ところで、従来から、
ローラ54をその摩耗防止、軽量化を目的としてセラミ
ックスで形成することが考えられている。しかしなが
ら、実用化にあたって、材料費などコストが高くつくこ
とが問題となっている。
By the way, from the past,
It is considered that the roller 54 is made of ceramics for the purpose of preventing its wear and reducing its weight. However, in practical application, there is a problem that costs such as material costs are high.

【0005】本発明は、このような事情に鑑み、ローラ
をセラミックスで形成するにあたって可及的な低コスト
化を実現できるようにすることを課題としている。
In view of such circumstances, it is an object of the present invention to realize cost reduction as much as possible when the roller is made of ceramics.

【0006】[0006]

【課題を解決するための手段】本発明のカムフォロワ装
置は、カムに当接させられるローラが二つ一対のアーム
に回転自在に支持されてなるものであって、前記ローラ
がセラミックスで形成されているとともに、その両端面
に凹部が設けられ、この凹部を含む端面が未研磨の粗い
面とされている。
In a cam follower device of the present invention, a roller abutting against a cam is rotatably supported by two pairs of arms, and the roller is made of ceramics. In addition, concave portions are provided on both end surfaces, and the end surfaces including the concave portions are rough unpolished surfaces.

【0007】なお、前記ローラの両端面の凹部は、外径
側から内径側にかけて軸方向内方へ傾斜するように凹む
ものであるとともに、このローラの外周面にクラウニン
グ加工を施すのが好ましい。
The recesses on both end faces of the roller are recessed so as to incline inward in the axial direction from the outer diameter side to the inner diameter side, and the outer peripheral surface of the roller is preferably crowned.

【0008】[0008]

【作用】ローラが単なる円筒形のものでなく、両端面に
凹部を設けてあるから、その凹み分についてセラミック
ス使用量が少なくなる。また、ローラ端面の研磨を省略
するから、加工面でのコスト低減が図れる。
Since the roller is not of a cylindrical shape but has concave portions on both end faces, the amount of ceramics used for the concave portion is small. Further, since the polishing of the roller end surface is omitted, the cost on the processed surface can be reduced.

【0009】しかも、ローラ端面の凹部が周辺潤滑油の
溜まりとなるとともに、ローラの未研磨の端面の微小凹
凸部分に周辺潤滑油が保持されることになり、ローラ端
面とアームとの摺接部位への潤滑油供給が良好に行える
ようになる。
In addition, the concave portion of the roller end surface serves as a reservoir for the peripheral lubricating oil, and the peripheral lubricating oil is retained in the minute irregularities on the unpolished end surface of the roller, so that the sliding contact portion between the roller end surface and the arm is formed. The lubricating oil can be satisfactorily supplied to it.

【0010】[0010]

【実施例】図1に本発明の一実施例を示している。この
実施例は従来例で説明したものに本発明思想を適用した
構造としており、実施例図において従来例図と対応する
部品、部分に同一符号を付してある。すなわち、図中、
50はロッカーアーム、52はカム、54はローラ、5
5は二つ一対のアーム、56は軸である。ローラ54
は、窒化けい素を主体として焼結されるものであり、軸
56は軸受鋼や高速度鋼などの金属からなる。
FIG. 1 shows an embodiment of the present invention. This embodiment has a structure in which the idea of the present invention is applied to that described in the conventional example, and the parts and parts corresponding to those in the conventional example are designated by the same reference numerals in the example. That is, in the figure,
50 is a rocker arm, 52 is a cam, 54 is a roller, 5
Reference numeral 5 is a pair of arms, and 56 is a shaft. Roller 54
Is sintered mainly with silicon nitride, and the shaft 56 is made of metal such as bearing steel or high speed steel.

【0011】なお、軸56は、図示していないが、例え
ばアーム55,55の貫通孔に対して挿入された後、両
端面がかしめられることにより、アーム55,55に対
して固定的に取り付けられる。この軸56の軸方向中間
部分にローラ54が回転自在となるようにわずかな隙間
を介して外嵌されており、このため、ローラ54がアー
ム55,55の間に挟まれた状態になっている。
Although not shown, the shaft 56 is fixedly attached to the arms 55, 55 by, for example, being inserted into the through holes of the arms 55, 55 and then caulking both end surfaces. To be The roller 54 is externally fitted to the axially intermediate portion of the shaft 56 with a slight gap so as to be rotatable, and therefore, the roller 54 is sandwiched between the arms 55, 55. There is.

【0012】この実施例では、ローラ54に特徴があ
る。すなわち、ローラ54の両端面には、外径側から内
径側にかけて軸方向内方へ直線的に傾斜するように凹む
凹部57,57が設けられ、この凹部57,57を含む
端面が未研磨の粗い面とされている。そして、ローラ5
4の外周面にはクラウニング加工が施されているととも
に、ローラ54の貫通孔の内周面は鏡面状に研磨されて
いる。なお、ローラ54の外周面のクラウニング加工
は、図において極端に大きく記載してある。
In this embodiment, the roller 54 is characteristic. That is, on both end surfaces of the roller 54, recesses 57, 57 are provided which are recessed so as to linearly incline in the axial direction from the outer diameter side to the inner diameter side, and the end surfaces including the recesses 57, 57 are not polished. It has a rough surface. And roller 5
The outer peripheral surface of No. 4 is crowned, and the inner peripheral surface of the through hole of the roller 54 is mirror-finished. The crowning process for the outer peripheral surface of the roller 54 is extremely large in the drawing.

【0013】このようなローラ54を用いていると、ロ
ーラ54の両端面の凹部57,57が周辺潤滑油の溜ま
りとなるとともに、ローラ54の未研磨の端面の微小凹
凸部分に周辺潤滑油が保持されることになり、ローラ5
4の端面とアーム55,55との摺接部位およびローラ
54の貫通孔と軸56との間へ潤滑油が供給されやすく
なる。
When such a roller 54 is used, the recesses 57, 57 on both end surfaces of the roller 54 serve as a reservoir for the peripheral lubricating oil, and the peripheral lubricating oil is applied to the minute irregularities on the unpolished end surface of the roller 54. Will be held, roller 5
The lubricating oil is easily supplied to the sliding contact portion between the end surface of No. 4 and the arms 55, 55, and the through hole of the roller 54 and the shaft 56.

【0014】ところで、ローラ54の端面に凹部57,
57を設けたことにより、ローラ54の貫通孔の内周面
幅が小さくなり、そこでの単位面積当たりの当接面圧が
増大するようになるけれども、このローラ54と軸56
との当接面圧はもともと比較的小さいので、ローラ54
が破損に至る心配はない。
By the way, a concave portion 57 is formed on the end surface of the roller 54,
By providing 57, the inner peripheral surface width of the through hole of the roller 54 becomes smaller, and the contact surface pressure per unit area there becomes larger.
Since the contact pressure with the roller is relatively small from the beginning, the roller 54
There is no fear of damage.

【0015】また、ローラ54の外周面にクラウニング
加工を施していれば、ローラ54の外周面の端縁が角張
っていても、この端縁部位がカム52に対して非接触と
なるのでそこへの応力集中は避けられる。しかし、この
端縁部分は、搬送時などの万一の衝突を考慮すると、丸
く加工しておくのが好ましい。
If the outer peripheral surface of the roller 54 is crowned, even if the end edge of the outer peripheral surface of the roller 54 is angular, this end edge portion is not in contact with the cam 52, so there it is. The stress concentration of can be avoided. However, it is preferable that the edge portion is rounded in consideration of a collision during transportation.

【0016】なお、本発明は上記実施例のみに限定され
ない。例えば、図2に示すように、ローラ54の両端面
に設けてある凹部57,57の形状をお椀形にしてもよ
いなど、特に限定されない。また、ローラ54の支持形
態は、ローラ54を軸56に一体的に外嵌し、この軸5
6の両端を各アーム55,55の貫通孔に対してわずか
な隙間を介して回動自在に挿入してもよい。この場合、
軸56の両端部分の外周面またはアーム55,55の貫
通孔の内周面の少なくとも一方に固体潤滑剤(フッ素系
合成樹脂、グラファイト、MoS2 、金、銀など)をコ
ーティングするか、あるいは両者間に転がり軸受を介装
するのが好ましい。
The present invention is not limited to the above embodiment. For example, as shown in FIG. 2, the shape of the recesses 57, 57 provided on both end surfaces of the roller 54 may be bowl-shaped, and there is no particular limitation. Further, the supporting form of the roller 54 is such that the roller 54 is integrally fitted onto the shaft 56,
Both ends of 6 may be rotatably inserted into the through holes of the arms 55, 55 with a slight gap. in this case,
At least one of the outer peripheral surfaces of both ends of the shaft 56 or the inner peripheral surfaces of the through holes of the arms 55, 55 is coated with a solid lubricant (fluorine-based synthetic resin, graphite, MoS 2 , gold, silver, etc.), or both. It is preferable to interpose a rolling bearing between them.

【0017】[0017]

【発明の効果】以上のように、本発明では、ローラの形
状を工夫することにより素材であるセラミックス使用量
を可及的に少なく制限しているから、ローラ材料費を削
減できるようになる。さらに、ローラの両端面を未研磨
として加工面での手間を省略しているから、ローラに関
するトータルな製作コストを下げることができ、セラミ
ックス製ローラの実用化に大きく貢献できる結果とな
る。
As described above, in the present invention, the amount of ceramics used as a raw material is limited to a minimum by devising the shape of the roller, so that the roller material cost can be reduced. Furthermore, since both end surfaces of the roller are not polished and the labor on the processed surface is omitted, the total manufacturing cost of the roller can be reduced, and the result can greatly contribute to the practical use of the ceramic roller.

【0018】しかも、ローラ端面の凹部を周辺潤滑油の
溜まりとして利用できるとともに、ローラの未研磨の端
面の微小凹凸部分に周辺潤滑油を保持させることができ
るようになるから、少なくともローラ端面とアームとの
摺接部位への潤滑油供給が良好に行えて潤滑条件の向上
に貢献できるようになる。
Moreover, since the concave portion of the roller end surface can be used as a reservoir for the peripheral lubricating oil and the peripheral lubricating oil can be retained in the minute irregularities of the unpolished end surface of the roller, at least the roller end surface and the arm can be held. The lubricating oil can be satisfactorily supplied to the sliding contact portion with the and can contribute to the improvement of the lubricating condition.

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

【図1】本発明のカムフォロワ装置の一実施例で、図3
に対応する図。
1 is an embodiment of a cam follower device of the present invention, and FIG.
Figure corresponding to.

【図2】本発明の他の実施例で、図3に対応する図。FIG. 2 is a view corresponding to FIG. 3 in another embodiment of the present invention.

【図3】一般的なオーバーヘッドカムシャフト型式の動
弁機構を示す側面図。
FIG. 3 is a side view showing a general overhead camshaft type valve mechanism.

【図4】従来のカムフォロワ装置で、図3の(4)−
(4)線断面矢視図。
FIG. 4 is a conventional cam follower device (4)-
(4) A line sectional view.

【符号の説明】[Explanation of symbols]

50 ロッカアーム 54 ローラ 55 アーム 56 軸 57 ローラ端面の凹部 50 rocker arm 54 roller 55 arm 56 shaft 57 roller end face recess

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 カムに当接させられるローラが二つ一対
のアームに回転自在に支持されてなるカムフォロワ装置
であって、 前記ローラがセラミックスで形成されているとともに、
その両端面に凹部が設けられ、この凹部を含む端面が未
研磨の粗い面とされている、ことを特徴とするカムフォ
ロワ装置。
1. A cam follower device in which a roller to be brought into contact with a cam is rotatably supported by two pairs of arms, wherein the roller is made of ceramics, and
A cam follower device, characterized in that a concave portion is provided on both end surfaces thereof, and an end surface including the concave portion is an unpolished rough surface.
【請求項2】 請求項1のカムフォロワ装置において、
前記ローラの両端面の凹部が外径側から内径側にかけて
軸方向内方へ傾斜するように凹むものであるとともに、
このローラの外周面にクラウニング加工が施されてい
る、ことを特徴とするカムフォロワ装置。
2. The cam follower device according to claim 1,
The recesses on both end surfaces of the roller are recessed so as to be inclined inward in the axial direction from the outer diameter side to the inner diameter side,
A cam follower device characterized in that the outer peripheral surface of the roller is crowned.
JP1460493A 1993-02-01 1993-02-01 Cam-follower device Pending JPH06229456A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1460493A JPH06229456A (en) 1993-02-01 1993-02-01 Cam-follower device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1460493A JPH06229456A (en) 1993-02-01 1993-02-01 Cam-follower device

Publications (1)

Publication Number Publication Date
JPH06229456A true JPH06229456A (en) 1994-08-16

Family

ID=11865808

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1460493A Pending JPH06229456A (en) 1993-02-01 1993-02-01 Cam-follower device

Country Status (1)

Country Link
JP (1) JPH06229456A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003307267A (en) * 2002-04-12 2003-10-31 Koyo Seiko Co Ltd Cam follower
FR2880911A1 (en) * 2005-01-14 2006-07-21 Skf Ab Valve operating mechanism for internal combustion engines has roller shaft with bore to retain bearing shaft with outside contact area for cam of cam shaft of internal combustion engine, length of bore is smaller than width of contact area
JP2009250078A (en) * 2008-04-03 2009-10-29 Ozak Seiko Co Ltd Fuel injection pump device
EP3184798A3 (en) * 2015-12-22 2017-07-05 Delphi International Operations Luxembourg S.à r.l. High pressure pump

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003307267A (en) * 2002-04-12 2003-10-31 Koyo Seiko Co Ltd Cam follower
FR2880911A1 (en) * 2005-01-14 2006-07-21 Skf Ab Valve operating mechanism for internal combustion engines has roller shaft with bore to retain bearing shaft with outside contact area for cam of cam shaft of internal combustion engine, length of bore is smaller than width of contact area
JP2009250078A (en) * 2008-04-03 2009-10-29 Ozak Seiko Co Ltd Fuel injection pump device
EP3184798A3 (en) * 2015-12-22 2017-07-05 Delphi International Operations Luxembourg S.à r.l. High pressure pump

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