JP4499873B2 - Valve lifter and valve mechanism - Google Patents

Valve lifter and valve mechanism Download PDF

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Publication number
JP4499873B2
JP4499873B2 JP2000150314A JP2000150314A JP4499873B2 JP 4499873 B2 JP4499873 B2 JP 4499873B2 JP 2000150314 A JP2000150314 A JP 2000150314A JP 2000150314 A JP2000150314 A JP 2000150314A JP 4499873 B2 JP4499873 B2 JP 4499873B2
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Japan
Prior art keywords
valve
roller
valve lifter
lifter
end wall
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JP2001329809A (en
Inventor
清治 津田
清史 柵木
守広 山本
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Otics Corp
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Otics Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2307/00—Preventing the rotation of tappets

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  • Valve-Gear Or Valve Arrangements (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、内燃機関の動弁機構に用いられる直打式のバルブリフタに関するものである。
【０００２】
【従来の技術】
図７〜図９に示すように、一般的なバルブリフタ５０は、円筒状の側壁部５１とその上端を閉鎖する円板状の端壁部５２とが鋼材の鍛造加工等により一体成形されてなり、倒立カップ状をなしている。
図７及び図８のバルブリフタ５０は、端壁部５２の上面をカム６０が摺接するカム摺接面とする一方、端壁部５２の下面をバルブ６１を押し付けるバルブ押付面としたものである。端壁部５２の下面とバルブ６１のステム端面との間にはバルブクリアランス調整用のインナシム５３を介装する。
図９のバルブリフタ５０は、端壁部５２の上面とカム６０との間にバルブクリアランス調整用のアウタシム５４を介装し、該アウタシム５４の上面をカム６０が摺接するカム摺接面とする一方、端壁部５２の下面をバルブ６１を押し付けるバルブ押付面としたものである。
【０００３】
【発明が解決しようとする課題】
近年、内燃機関の低燃費化のニーズが高まってきたため、バルブリフタについても低フリクション化を狙い、前記端壁部５２やアウタシム５４を表面処理したり表面粗度を向上させたりする改善を加えてきた。この改善によりある程度の低フリクション化は得られたが、限界があり、図１０に示すように、改善後のバルブリフタでもローラ付きロッカアームには遠く及ばなかった。
【０００４】
また、端壁部５２のカム摺接面やバルブ押付面には高い耐摩耗性が必要とされるため、前記鍛造加工後にバルブリフタ全体に熱処理（浸炭焼入れや軟窒化処理）を施して硬化させ、耐摩耗性を高めている。ところが、側壁部５１には端壁部５２ほどの硬化は必要でないにも拘わらず端壁部５２と共に熱処理されていたため、側壁部５１が熱応力により変形しやすいとか、熱処理後の研削時に黒皮残りが発生するおそれがあるとか、硬化する一方で靭性が低下し衝撃荷重に弱くなるとかという問題があり、熱処理品質管理と造り込みとが大変であった。
【０００５】
本発明の目的は、上記の問題を解決し、十分な低フリクション化を図ることができるだけでなく、カム摺接面やバルブ押付面の耐摩耗性を高めることができ、且つ、バルブリフタの熱処理品質管理と造り込みとを簡素化することができるバルブリフタ及び動弁機構を提供することにある。
【０００６】
【課題を解決するための手段】
本発明に係るバルブリフタは、内燃機関の動弁機構に用いられる直打式のバルブリフタにおいて、バルブリフタ頂部にローラを回転可能に軸支し、該ローラの外周面上部をカム摺接面とし、前記ローラの外周面下部をバルブ押付面としたことを特徴とする。
【０００８】
次に、本発明に係る動弁機構は、上記のバルブリフタをシリンダヘッドに往復動可能に設けた動弁機構であって、前記バルブリフタとシリンダヘッドとの間に、バルブリフタ全体又は少なくともローラがバルブリフタ中心線の周りに回るのを止める回り止め構造又は回り止め形状を設けたことを特徴とする。
【０００９】
回り止め構造としては、特に限定されないが、次の態様を例示できる。
▲１▼ バルブリフタをシリンダヘッドのリフタガイド穴に往復摺動可能に挿入する場合、バルブリフタの外周とリフタガイド穴の内周とに、前記往復摺動方向には相対摺動可能であるがバルブリフタ中心線の周りには相対変位不能である凸部と凹部とを相対的に設けること。
▲２▼ バルブリフタとシリンダヘッドとに相対的に設けられた、二組以上のピンと該ピンの摺動をガイドするスリーブとの組み合わせ
【００１０】
回り止め形状としては、特に限定されないが、次の態様を例示できる。
▲１▼ バルブリフタをシリンダヘッドのリフタガイド穴に往復摺動可能に挿入する場合、バルブリフタを平面長円形又は平面楕円形に形成し、リフタガイド穴を断面長円穴又は断面楕円穴とすること。
【００１１】
【発明の実施の形態】
図１及び図２に示す第一実施形態のバルブリフタ１０は、円筒状の側壁部１１とその上端の端壁部１２とが鋼材から鍛造加工等により一体成形されるとともに、バルブリフタ頂部である端壁部１２にローラ２０が回転可能に軸支されてなる。
【００１２】
端壁部１２は側壁部１１より厚く形成され、端壁部１２の中央部には平面略長方形のローラ配置穴１３が上下に貫設されている。ローラ配置穴１３の短手方向すぐ両側（図では前側及び後側）の端壁部１２の上面にはローラフォーク１４が一体的に立設され、両ローラフォーク１４の下部には取付孔１５が前後に貫設されている。図示例のローラフォーク１４は、ローラ２０の半径よりやや小さい半径をもつ正面略半円形の壁である。取付孔１５の中心線は端壁部１２の上面と略同一レベル（高さ）に位置しているため、該取付孔１５に後述する軸支ピンを通せるように、両取付孔１５の開口のすぐ両側（図では前側及び後側）の端壁部１２の上面には取付孔１５の下半分に略連続する断面略半円形の溝１６が凹設されている。
【００１３】
そして、ローラ配置穴１３にアウタローラ２０ａとインナローラ２０ｂとからなる二重構造のローラ２０が配置され、該ローラ２０の中心孔２１と両ローラフォーク１４の取付孔１５とが合わされた状態でこれらの孔に軸支ピン２２が通され、軸支ピン２２の両端が両ローラフォーク１４にカシメ止めされている。ローラ２０は軸支ピン２２との間のクリアランスにより回転可能であるとともに、アウタローラ２０ａとインナローラ２０ｂとの間のクリアランスにより回転可能である。こうして回転可能に軸支されたローラ２０は、その外周面上部の略半周が端壁部１２の上面より上方に突出して、カム１が摺接するカム摺接面となっている。ローラ２０の回転中心線は、カム１の回転中心線と略平行である。また、ローラ２０の外周面下部はわずかに端壁部１２の下面より下方に突出して、バルブ２を押し付けるバルブ押付面となっている。
【００１４】
なお、ローラ２０の外周面下部とバルブ２のステム端面との間にはバルブクリアランス調整用のインナシム３が介装される。
【００１５】
このバルブリフタ１０はシリンダヘッド５に形成されたリフタガイド穴６に往復摺動可能に挿入されて動弁機構として使用されるが、ローラ２０の回転中心線はカム１の回転中心線と常に略平行である必要がある。そこで、ローラ２０を含むバルブリフタ１０全体がバルブリフタ中心線の周りに回るのを止める回り止め構造として、側壁部１１の外周の一箇所とリフタガイド穴６の内周の一箇所とに、前記往復摺動方向には相対摺動可能であるがバルブリフタ中心線の周りには相対変位不能である凸部１７と凹溝７とが設けられている。
【００１６】
本実施形態のバルブリフタ１０及び動弁機構によれば、回転可能に軸支したローラ２０の外周面上部をカム１が摺接するカム摺接面としたので、ローラ付きロッカアームに匹敵する低フリクション化を図ることができるとともに、バルブリフタ特有の高い剛性を併せ持つ動弁機構を構成することができる。
【００１７】
しかも、本実施形態ではローラ２０の外周面上部の略半周を端壁部１２の上面より上方に突出させてカム摺接面としたので、カム１の摺接範囲を広く取ることができ、大きいリフト量に対応することができる。
【００１８】
また、高い耐摩耗性が必要とされるカム摺接面やバルブ押付面をローラ２０に受け持たせるので、ローラフォーク１４に軸支する前のローラ２０に十分な熱処理（浸炭焼入れや軟窒化処理）を施して硬化させ、耐摩耗性を高めれば済み、側壁部１１及び端壁部１２の熱処理は軽く行うか又は省略すればよい。このため、側壁部１１が熱応力により変形したり、熱処理後の研削時に黒皮残りが発生したり、靭性が低下して衝撃荷重に弱くなったりといった問題はほとんど起こらず、熱処理の品質管理と造り込みとを簡素化することができる。
【００１９】
次に、図３に示す第二実施形態のバルブリフタ１０は（動弁機構は図示略）、ローラ２０を前記アウタローラ２０ａに相当する一重ローラとし、前記インナローラ２０ｂに代えて多数のニードル２３（又はボール）を設けた点においてのみ第一実施形態と相違するものである。
【００２０】
また、図４に示す第三実施形態のバルブリフタ１０は（動弁機構は図示略）、ローラ２０を前記アウタローラ２０ａとインナローラ２０ｂとを一体化したに相当する一重ローラとした点においてのみ第一実施形態と相違するものである。
【００２１】
また、図５及び図６に示す参考発明である第四実施形態のバルブリフタ１０及び動弁機構は、ローラ２０の外周面下部をバルブ押付面とするのではなく、ローラ２０のすぐ下方に側壁部１１の中間部を閉鎖する中間壁２４（ローラ２０には接触しない）を形成し（図示例では一体形成）、該中間壁２４の下面をバルブ押付面とした点においてのみ第一実施形態と相違するものである。
【００２２】
これらの第二〜四実施形態によっても、第一実施形態と同様の作用効果が得られる。
【００２３】
なお、本発明又は参考発明は前記実施形態に限定されるものではなく、例えば以下のように、発明の趣旨から逸脱しない範囲で適宜変更して具体化することもできる。
（１）第四実施形態の中間壁２４は、第二実施形態や第三実施形態において形成することもできる。
（２）端壁部１２及びローラフォーク１４の形状を変更すること。つまり、ローラ２０を確実に軸支できるものであれば、端壁部１２及びローラフォーク１４の形状は特に限定されず、例えば端壁部とローラフォークとに峻別できないような一体形のブロック状フォークでもよい。
【００２４】
【発明の効果】
以上詳述した通り、本発明に係るバルブリフタ及び動弁機構によれば、十分な低フリクション化を図ることができるだけでなく、カム摺接面やバルブ押付面の耐摩耗性を高めることができ、且つ、バルブリフタの熱処理品質管理と造り込みとを簡素化することができる、という優れた効果を奏する。
【図面の簡単な説明】
【図１】第一実施形態のバルブリフタ及び動弁機構の断面図である。
【図２】同バルブリフタを示し、（ａ）は平面図、（ｂ）は断面図、（ｃ）は斜視図である。
【図３】第二実施形態のバルブリフタを示し、（ａ）は平面図、（ｂ）は断面図である。
【図４】第三実施形態のバルブリフタを示し、（ａ）は平面図、（ｂ）は断面図である。
【図５】第四実施形態のバルブリフタ及び動弁機構の断面図である。
【図６】同バルブリフタを示し、（ａ）は平面図、（ｂ）は断面図である。
【図７】従来例のバルブリフタ及び動弁機構の断面図である。
【図８】同バルブリフタを示し、（ａ）は平面図、（ｂ）は断面図である。
【図９】別の従来例のバルブリフタを示し、（ａ）は平面図、（ｂ）は断面図である。
【図１０】従来例のバルブリフタとローラ付きロッカアームとのフリクションを比較して示すグラフである。
【符号の説明】
１ カム
２ バルブ
３ インナシム
５ シリンダヘッド
６ リフタガイド穴
７ 凹溝
１０ バルブリフタ
１１ 側壁部
１２ 端壁部
１３ ローラ配置穴
１４ ローラフォーク
１５ 取付孔
１６ 溝
１７ 凸部
２０ ローラ
２１ 中心孔
２２ 軸支ピン
２３ ニードル
２４ 中間壁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a direct hitting valve lifter used in a valve mechanism of an internal combustion engine.
[0002]
[Prior art]
As shown in FIGS. 7 to 9, a general valve lifter 50 is formed by integrally forming a cylindrical side wall 51 and a disk-shaped end wall 52 that closes the upper end thereof by forging a steel material or the like. It has an inverted cup shape.
The valve lifter 50 shown in FIGS. 7 and 8 has a top surface of the end wall portion 52 as a cam sliding contact surface on which the cam 60 slides, and a bottom surface of the end wall portion 52 as a valve pressing surface that presses the valve 61. An inner shim 53 for adjusting the valve clearance is interposed between the lower surface of the end wall portion 52 and the stem end surface of the valve 61.
The valve lifter 50 in FIG. 9 has an outer shim 54 for adjusting a valve clearance interposed between the upper surface of the end wall portion 52 and the cam 60, and the upper surface of the outer shim 54 is a cam sliding contact surface on which the cam 60 slides. The lower surface of the end wall portion 52 is a valve pressing surface that presses the valve 61.
[0003]
[Problems to be solved by the invention]
In recent years, there has been an increase in fuel efficiency needs for internal combustion engines, and valve lifters have also been improved to surface-treat and improve surface roughness of the end wall 52 and outer shim 54 with the aim of reducing friction. . Although this improvement resulted in a reduction in friction to some extent, there was a limit, and as shown in FIG. 10, even the improved valve lifter did not reach the rocker arm with rollers.
[0004]
Moreover, since high wear resistance is required for the cam sliding contact surface and the valve pressing surface of the end wall portion 52, the entire valve lifter is subjected to heat treatment (carburizing quenching and soft nitriding treatment) after the forging, and is cured. Increases wear resistance. However, since the side wall 51 is heat treated together with the end wall 52 even though the end wall 52 is not required to be hardened, the side wall 51 is easily deformed due to thermal stress, or is blackened during grinding after the heat treatment. There is a problem that there is a possibility that the remainder may occur, or there is a problem that the toughness is lowered while being hardened, and the impact load is weakened.
[0005]
The object of the present invention is not only to solve the above-mentioned problems and to sufficiently reduce the friction, but also to improve the wear resistance of the cam sliding contact surface and the valve pressing surface, and the heat treatment quality of the valve lifter It is an object of the present invention to provide a valve lifter and a valve mechanism that can simplify management and manufacturing.
[0006]
[Means for Solving the Problems]
The valve lifter according to the present invention is a direct impact type valve lifter used in a valve operating mechanism of an internal combustion engine. A roller is rotatably supported on the top of the valve lifter, and an upper portion of the outer peripheral surface of the roller is used as a cam sliding contact surface. The lower part of the outer peripheral surface is a valve pressing surface.
[0008]
Next, a valve operating mechanism according to the present invention is a valve operating mechanism in which the above-described valve lifter is provided in a cylinder head so as to be able to reciprocate, and the entire valve lifter or at least a roller is disposed between the valve lifter and the cylinder head. An anti-rotation structure or anti-rotation shape that stops turning around the wire is provided.
[0009]
Although it does not specifically limit as a detent | locking structure, The following aspect can be illustrated.
(1) When the valve lifter is inserted into the lifter guide hole of the cylinder head so as to be reciprocally slidable, it can be slid relative to the outer periphery of the valve lifter and the inner periphery of the lifter guide hole in the reciprocating sliding direction. Protrusions and recesses that cannot be relatively displaced should be provided around the line.
(2) A combination of two or more pins and a sleeve for guiding the sliding of the pins provided relative to the valve lifter and the cylinder head.
Although it does not specifically limit as a non-rotating shape, The following aspect can be illustrated.
(1) When the valve lifter is inserted into the lifter guide hole of the cylinder head so as to be slidable back and forth, the valve lifter should be formed into a plane oval or plane ellipse, and the lifter guide hole should be a cross-sectional oblong hole or a cross-sectional elliptical hole.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The valve lifter 10 according to the first embodiment shown in FIGS. 1 and 2 includes a cylindrical side wall portion 11 and an end wall portion 12 at the upper end thereof integrally formed from a steel material by forging or the like, and an end wall that is a top portion of the valve lifter. A roller 20 is rotatably supported on the portion 12.
[0012]
The end wall portion 12 is formed to be thicker than the side wall portion 11, and a roller arrangement hole 13 having a substantially planar plane is provided vertically through the center portion of the end wall portion 12. A roller fork 14 is integrally provided on the upper surface of the end wall portion 12 on both sides (front and rear sides in the figure) immediately in the short direction of the roller arrangement hole 13, and a mounting hole 15 is provided at the lower part of both roller forks 14. It is installed in the front and back. The roller fork 14 in the illustrated example is a front semicircular wall having a radius slightly smaller than the radius of the roller 20. Since the center line of the mounting hole 15 is located at substantially the same level (height) as the upper surface of the end wall portion 12, the mounting holes 15 are opened so that a shaft support pin described later can be passed through the mounting hole 15. A groove 16 having a substantially semicircular cross section that is substantially continuous with the lower half of the mounting hole 15 is formed in the upper surface of the end wall portion 12 immediately on both sides (front side and rear side in the figure).
[0013]
A roller 20 having a double structure consisting of an outer roller 20a and an inner roller 20b is arranged in the roller arrangement hole 13, and the center hole 21 of the roller 20 and the mounting holes 15 of both roller forks 14 are aligned with each other. The shaft support pins 22 are passed through, and both ends of the shaft support pins 22 are fastened to both roller forks 14. The roller 20 can be rotated by the clearance between the shaft support pins 22 and can be rotated by the clearance between the outer roller 20a and the inner roller 20b. The roller 20 rotatably supported in this manner has a cam sliding contact surface with which the cam 1 is slidably contacted so that the substantially half circumference of the upper portion of the outer peripheral surface protrudes upward from the upper surface of the end wall portion 12. The rotation center line of the roller 20 is substantially parallel to the rotation center line of the cam 1. Further, the lower portion of the outer peripheral surface of the roller 20 slightly protrudes downward from the lower surface of the end wall portion 12 to form a valve pressing surface that presses the valve 2.
[0014]
An inner shim 3 for adjusting the valve clearance is interposed between the lower portion of the outer peripheral surface of the roller 20 and the stem end surface of the valve 2.
[0015]
The valve lifter 10 is inserted into a lifter guide hole 6 formed in the cylinder head 5 so as to be reciprocally slidable and used as a valve mechanism. The rotation center line of the roller 20 is always substantially parallel to the rotation center line of the cam 1. Need to be. Therefore, as a rotation prevention structure that stops the entire valve lifter 10 including the roller 20 from rotating around the center line of the valve lifter, the reciprocating slide is provided at one location on the outer periphery of the side wall 11 and one location on the inner periphery of the lifter guide hole 6. A convex portion 17 and a concave groove 7 are provided around the valve lifter center line but are relatively slidable in the moving direction but cannot be relatively displaced.
[0016]
According to the valve lifter 10 and the valve operating mechanism of the present embodiment, the upper portion of the outer peripheral surface of the roller 20 that is rotatably supported is a cam sliding contact surface on which the cam 1 is slidably contacted. In addition, it is possible to configure a valve mechanism that has both high rigidity unique to the valve lifter.
[0017]
In addition, in this embodiment, since the substantially half circumference of the upper portion of the outer peripheral surface of the roller 20 protrudes upward from the upper surface of the end wall portion 12 to form a cam sliding contact surface, the sliding contact range of the cam 1 can be widened and is large. It can correspond to the lift amount.
[0018]
Further, since the roller sliding surface is provided with a cam sliding contact surface and a valve pressing surface that require high wear resistance, sufficient heat treatment (carburizing quenching and soft nitriding treatment) is performed on the roller 20 before pivotally supporting the roller fork 14. ) To be hardened to increase wear resistance, and the heat treatment of the side wall portion 11 and the end wall portion 12 may be performed lightly or omitted. For this reason, problems such as deformation of the side wall portion 11 due to thermal stress, generation of a black skin residue during grinding after heat treatment, and reduction in toughness and weakening to impact load do not occur. Simplification can be simplified.
[0019]
Next, the valve lifter 10 of the second embodiment shown in FIG. 3 (the valve operating mechanism is not shown) has a roller 20 as a single roller corresponding to the outer roller 20a, and a plurality of needles 23 (or balls) instead of the inner roller 20b. ) Is different from the first embodiment only in the point provided.
[0020]
Further, the valve lifter 10 of the third embodiment shown in FIG. 4 (the valve operating mechanism is not shown) is the first implementation only in that the roller 20 is a single roller corresponding to the integration of the outer roller 20a and the inner roller 20b. It is different from the form.
[0021]
Further, the valve lifter 10 and the valve operating mechanism of the fourth embodiment which is the reference invention shown in FIGS. 5 and 6 do not use the lower portion of the outer peripheral surface of the roller 20 as a valve pressing surface, but a side wall portion just below the roller 20. 11 differs from the first embodiment only in that an intermediate wall 24 (which does not contact the roller 20) is formed to close the intermediate portion 11 (integrally formed in the illustrated example), and the lower surface of the intermediate wall 24 is a valve pressing surface. To do.
[0022]
According to these second to fourth embodiments, the same effects as those of the first embodiment can be obtained.
[0023]
In addition, this invention or reference invention is not limited to the said embodiment, For example, it can also be suitably changed and embodied as follows, for example in the range which does not deviate from the meaning of invention.
(1) The intermediate wall 24 of the fourth embodiment can also be formed in the second embodiment or the third embodiment.
(2) Changing the shapes of the end wall portion 12 and the roller fork 14. That is, the shape of the end wall portion 12 and the roller fork 14 is not particularly limited as long as the roller 20 can be reliably supported by the shaft. For example, an integrated block-shaped fork that cannot be distinguished from the end wall portion and the roller fork. But you can.
[0024]
【The invention's effect】
As described in detail above, according to the valve lifter and the valve mechanism according to the present invention, not only can the friction be sufficiently reduced, but also the wear resistance of the cam sliding contact surface and the valve pressing surface can be improved. In addition, there is an excellent effect that it is possible to simplify the heat treatment quality control and fabrication of the valve lifter.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a valve lifter and a valve operating mechanism according to a first embodiment.
2A and 2B show the valve lifter, in which FIG. 2A is a plan view, FIG. 2B is a cross-sectional view, and FIG. 2C is a perspective view.
3A and 3B show a valve lifter according to a second embodiment, wherein FIG. 3A is a plan view and FIG. 3B is a cross-sectional view.
4A and 4B show a valve lifter according to a third embodiment, in which FIG. 4A is a plan view and FIG. 4B is a cross-sectional view.
FIG. 5 is a sectional view of a valve lifter and a valve operating mechanism according to a fourth embodiment.
6A and 6B show the valve lifter, wherein FIG. 6A is a plan view and FIG. 6B is a cross-sectional view.
FIG. 7 is a sectional view of a conventional valve lifter and valve mechanism.
8A and 8B show the valve lifter, wherein FIG. 8A is a plan view and FIG. 8B is a cross-sectional view.
9A and 9B show another conventional valve lifter, in which FIG. 9A is a plan view and FIG. 9B is a cross-sectional view.
FIG. 10 is a graph showing a comparison of friction between a conventional valve lifter and a rocker arm with a roller.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cam 2 Valve 3 Inner shim 5 Cylinder head 6 Lifter guide hole 7 Recessed groove 10 Valve lifter 11 Side wall part 12 End wall part 13 Roller arrangement hole 14 Roller fork 15 Mounting hole 16 Groove 17 Convex part 20 Roller 21 Center hole 22 Shaft support pin 23 Needle 24 intermediate wall

Claims (2)

内燃機関の動弁機構に用いられる直打式のバルブリフタにおいて、バルブリフタ頂部にローラを回転可能に軸支し、該ローラの外周面上部をカム摺接面とし、前記ローラの外周面下部をバルブ押付面としたことを特徴とするバルブリフタ。 In a direct impact type valve lifter used in a valve mechanism of an internal combustion engine , a roller is rotatably supported on the top of the valve lifter, an upper part of the outer peripheral surface of the roller is used as a cam sliding contact surface, and a lower part of the outer peripheral surface of the roller is pressed against the valve. Valve lifter characterized by having a surface. 請求項１記載のバルブリフタをシリンダヘッドに往復動可能に設けた動弁機構であって、前記バルブリフタとシリンダヘッドとの間に、前記バルブリフタ全体又は少なくとも前記ローラがバルブリフタ中心線の周りに回るのを止める回り止め構造又は回り止め形状を設けたことを特徴とする動弁機構。  2. A valve operating mechanism in which the valve lifter according to claim 1 is provided in a cylinder head so as to be able to reciprocate, wherein the entire valve lifter or at least the roller rotates around the valve lifter center line between the valve lifter and the cylinder head. A valve operating mechanism provided with a detent structure or a detent shape.
JP2000150314A 2000-05-22 2000-05-22 Valve lifter and valve mechanism Expired - Fee Related JP4499873B2 (en)

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KR20040041367A (en) * 2002-11-11 2004-05-17 현대자동차주식회사 cam shaft of valve train system
JP2004346760A (en) * 2003-05-20 2004-12-09 Nsk Ltd Cam follower device
JP5156610B2 (en) * 2008-05-19 2013-03-06 株式会社オティックス Sliding lifter and manufacturing method thereof
US8869763B2 (en) 2012-05-01 2014-10-28 Caterpillar Inc. Internal combustion engine having valve lifters with misalignment limiting end caps
EP2853697B1 (en) * 2013-09-27 2016-04-27 Aktiebolaget SKF Mechanical system, injection pump and valve actuator comprising such a mechanical system and manufacturing method
EP3081771B1 (en) 2015-04-15 2019-03-13 Aktiebolaget SKF Cam follower, injection pump and valve actuator comprising such a cam follower, and manufacturing method

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JPH0214402U (en) * 1988-07-14 1990-01-30
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JPH04284161A (en) * 1991-03-11 1992-10-08 Nippondenso Co Ltd Cylindrical fuel injection pump

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JPS62152002U (en) * 1986-03-18 1987-09-26
JPS6322306U (en) * 1986-07-28 1988-02-15
JPS6446404U (en) * 1987-09-16 1989-03-22
JPH03168307A (en) * 1989-11-24 1991-07-22 Takuya Matsumoto Valve driving device for engine
JP2722766B2 (en) * 1990-04-12 1998-03-09 株式会社デンソー Fuel injection pump
JPH0598911A (en) * 1991-10-04 1993-04-20 Fuji Oozx Kk Roller rocker arm
IT1279049B1 (en) * 1995-10-27 1997-12-04 Eaton Automotive Spa DIRECT ACTING MECHANICAL PUNTER EQUIPPED WITH A ROLL FOR CONTACT WITH THE CAM OF THE CAMSHAFT OF AN INTERNAL COMBUSTION ENGINE

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JPH04284161A (en) * 1991-03-11 1992-10-08 Nippondenso Co Ltd Cylindrical fuel injection pump

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