JPH0518221A - Variable valve system of engine - Google Patents
Variable valve system of engineInfo
- Publication number
- JPH0518221A JPH0518221A JP3175031A JP17503191A JPH0518221A JP H0518221 A JPH0518221 A JP H0518221A JP 3175031 A JP3175031 A JP 3175031A JP 17503191 A JP17503191 A JP 17503191A JP H0518221 A JPH0518221 A JP H0518221A
- Authority
- JP
- Japan
- Prior art keywords
- cam
- rocker
- sub
- engine
- rocker arm
- 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
Links
Classifications
-
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L2013/0078—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by axially displacing the camshaft
Landscapes
- Valve Device For Special Equipments (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、立体カムを有するカム
シャフトを軸方向に移動させるエンジンの可変動弁装置
の改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a variable valve operating system for an engine that axially moves a cam shaft having a three-dimensional cam.
【０００２】[0002]
【従来の技術】従来、この種の可変動弁装置として例え
ば図３に示すものがあった（参考資料…ＭＯＴＯＲＴＥ
ＣＨＮＩＳＣＨＥ ＺＥＩＴＳＣＨＲＩＦＴ Ｆｒａｎ
ｋｈ−Ｋｏｓｍｏｓ Ｖｅｒｌａｇｓ−Ｇｍｂｈ＆Ｃ
ｏ．１９８６年５月発行）。2. Description of the Related Art Conventionally, a variable valve operating device of this type has been shown in FIG. 3, for example (reference material: MOTORTE).
CHNISCHE ZEITSCHRIFT Franc
kh-Kosmos Verlags-Gmbh & C
o. Published in May 1986).
【０００３】これについて説明すると、シリンダヘッド
２０には各弁と同軸上で摺動自在に嵌合するリフタ２２
が設けられ、このリフタ２２上には立体カム２１に摺接
する滑りフォロワ２３が揺動可能に設けられている。Explaining this, the cylinder head 20 has a lifter 22 slidably fitted coaxially with each valve.
A slide follower 23 that slidably contacts the three-dimensional cam 21 is swingably provided on the lifter 22.
【０００４】リフタ２２が立体カム２１に従動して往復
動する際に、滑りフォロワ２３は図中破線で示すように
立体カム２１のカム面の傾斜に対応してリフタ２２上で
揺動することにより、滑りフォロワ２３がカム面に対し
て常に平行に保たれて、両者の偏磨耗が防止されるよう
になっている。When the lifter 22 reciprocates following the solid cam 21, the slide follower 23 swings on the lifter 22 in accordance with the inclination of the cam surface of the solid cam 21 as shown by the broken line in the figure. As a result, the slide follower 23 is always kept parallel to the cam surface, and uneven wear of both is prevented.
【０００５】[0005]
【発明が解決しようとする課題】ところで、このような
従来装置では、滑りフォロワ２３が立体カム２１に摺接
する構造のために、両者間のフリクションが増大すると
いう問題点があった。By the way, in such a conventional apparatus, there is a problem in that the sliding follower 23 is in sliding contact with the three-dimensional cam 21 so that the friction between them increases.
【０００６】また、１気筒当たり２本以上の吸気弁や排
気弁を備えるエンジンの場合、立体カム２１は１つの弁
に対応して設けられているため、立体カム２１の軸方向
の長さが十分にとれず、リフト変化幅を大きくとれな
い。また軸長を長くせずにリフト変化幅を大きくするた
めには立体カム２１のカム面の傾斜角度が大きくなって
カムシャフト２４を軸方向に移動する駆動力が増大し、
実用化を難しくしていた。Further, in the case of an engine having two or more intake valves and exhaust valves per cylinder, since the three-dimensional cam 21 is provided corresponding to one valve, the three-dimensional cam 21 has an axial length. It is not possible to obtain a sufficient lift change width. Further, in order to increase the lift change width without increasing the axial length, the inclination angle of the cam surface of the three-dimensional cam 21 increases and the driving force for moving the cam shaft 24 in the axial direction increases.
It was difficult to put it into practical use.
【０００７】本発明は上記の点に着目し、立体カムを軸
方向に移動させるエンジンの可変動弁装置において、立
体カムとフォロワ間のフリクションを低減することを目
的とする。In view of the above points, the present invention has an object to reduce the friction between the solid cam and the follower in the variable valve operating system of the engine for moving the solid cam in the axial direction.
【０００８】[0008]
【課題を解決するための手段】本発明は、エンジン回転
に同期して回転するカムシャフトと、カムシャフトの軸
方向にカムプロフィールが変化する立体カムと、カムシ
ャフトを運転条件に応じて軸方向に変位させる駆動手段
とを備えるエンジンの可変動弁装置において、複数の弁
に当接する部位をもつロッカアームをエンジン本体に対
して揺動自在に設け、立体カムに転接するローラフォロ
ワを回転自在に支持するサブロッカを設け、ロッカアー
ムに対してサブロッカを揺動自在に支持する手段を設け
る。SUMMARY OF THE INVENTION According to the present invention, a camshaft that rotates in synchronism with engine rotation, a three-dimensional cam whose cam profile changes in the axial direction of the camshaft, and a camshaft in the axial direction according to operating conditions. In a variable valve operating system for an engine, including a driving means for displacing the rocker arm, a rocker arm having a portion contacting a plurality of valves is swingably provided with respect to the engine body, and a roller follower rollingly contacting a three-dimensional cam is rotatably supported A sub-rocker is provided, and means for rockably supporting the sub-rocker with respect to the rocker arm is provided.
【０００９】また、ロッカアームに対してサブロッカを
揺動自在に支持する手段として、ロッカアームにカムシ
ャフトと直交する方向に中心線をもつ円柱形に窪む凹部
を形成し、この凹部にサブロッカを摺動可能に嵌合させ
る。Further, as means for swingably supporting the sub-rocker with respect to the rocker arm, a recess depressed into a cylindrical shape having a center line in a direction orthogonal to the cam shaft is formed in the rocker arm, and the sub-rocker slides in the recess. Fit as much as possible.
【００１０】また、立体カムの回転軸に対するカム面の
傾斜角度を、カムプロフィールが大きくなる端部で比較
的に小さくする。Further, the inclination angle of the cam surface with respect to the rotation axis of the three-dimensional cam is made relatively small at the end where the cam profile becomes large.
【００１１】[0011]
【作用】ローラフォロワは各弁を閉弁方向に付勢するバ
ルブスプリングにより立体カムに押付けられるが、ロー
ラフォロワはカムシャフトの回転に伴って立体カムに転
接しながらロッカアームを揺動させるため、立体カムと
弁の間のフリクションを大幅に低減できる。The roller follower is pressed against the three-dimensional cam by the valve spring that biases each valve in the valve closing direction. The roller follower swings the rocker arm while rolling on the three-dimensional cam as the cam shaft rotates. The friction between the cam and the valve can be greatly reduced.
【００１２】１つのロッカアームに複数の弁と当接する
部位を設けたため、カムシャフトの軸受等の間で可能な
限り立体カムの軸方向の長さを大きくすることができ
る。この結果、立体カムの最大リフト量の差を大きくす
ることができ、また、回転軸に対するカム面の傾斜角度
を小さくしてカムシャフトを軸方向に移動する駆動力を
低減できる。Since one rocker arm is provided with a portion that comes into contact with a plurality of valves, the axial length of the three-dimensional cam can be made as large as possible between the bearings of the camshaft and the like. As a result, the difference in the maximum lift amount of the three-dimensional cam can be increased, and the inclination angle of the cam surface with respect to the rotating shaft can be reduced to reduce the driving force for moving the cam shaft in the axial direction.
【００１３】ローラフォロワが立体カムに転接する際
に、ローラフォロワの回転軸がサブロッカを介してロッ
カアーム上で揺動することにより、ローラフォロワの周
面がカム面に対して常に平行に保たれ、ローラフォロワ
とカム面の面圧が均一に分布するため、両者のフリクシ
ョンを低減できるとともに偏磨耗を防止できる。When the roller follower rolls on the solid cam, the rotary shaft of the roller follower swings on the rocker arm via the sub-rocker, so that the peripheral surface of the roller follower is always kept parallel to the cam surface. Since the surface pressures of the roller follower and the cam surface are evenly distributed, the friction between them can be reduced and uneven wear can be prevented.
【００１４】また、サブロッカをロッカアームに揺動可
能に支持する手段として、円柱形に窪む凹部に対してサ
ブロッカを摺動可能に嵌合させたため、ローラフォロワ
がロッカアーム上に大きく突出することがなく、エンジ
ンのコンパクト化がはかれる。As the means for swingably supporting the sub-rocker on the rocker arm, the sub-rocker is slidably fitted in the recessed portion which is formed in a cylindrical shape, so that the roller follower does not largely project onto the rocker arm. , The engine can be made compact.
【００１５】また、立体カムの回転軸に対するカム面の
傾斜角度を、カムプロフィールが大きくなる端部で比較
的に小さくしたため、カムシャフトの移動に伴って、ロ
ーラフォロワが立体カムの最もリフト量が大きくなる端
部へ移行する際に必要な駆動力を低減できる。Further, since the inclination angle of the cam surface with respect to the rotation axis of the solid cam is made relatively small at the end where the cam profile becomes large, the roller follower has the largest lift amount of the solid cam as the cam shaft moves. It is possible to reduce the driving force required when shifting to the larger end portion.
【００１６】[0016]
【実施例】図１は、１つの気筒について同一の機能を有
する２つの弁（吸気弁、排気弁のいずれでも良く、図示
のものは吸気弁とする）を備えたエンジンに対して本発
明を適用した場合の実施例を示している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the present invention for an engine provided with two valves (both intake valves and exhaust valves, which are shown as intake valves) having the same function for one cylinder. The example when applied is shown.
【００１７】これについて説明すると、各気筒には２本
の吸気弁１に対して単一のロッカアーム２が設けられ
る。ロッカアーム２の基端は各気筒に共通なロッカシャ
フト３を介してシリンダヘッド４に揺動自在に支持され
る。ロッカアーム２の先端には２本の吸気弁１のステム
頂部にそれぞれ当接する２つのバルブフォロワ５が設け
られる。このバルブフォロワ５とロッカアーム２の間に
は図示しない油通路から導かれる作動油圧によりバルブ
クリアランスを自動的に調節する油圧ラッシュアジャス
タ機構が設けられている。なお、１５はバルブスプリン
グであり、各吸気弁１を閉弁方向に付勢している。To explain this, each cylinder is provided with a single rocker arm 2 for two intake valves 1. A base end of the rocker arm 2 is swingably supported by a cylinder head 4 via a rocker shaft 3 common to each cylinder. Two valve followers 5 that come into contact with the stem tops of the two intake valves 1 are provided at the tip of the rocker arm 2. A hydraulic lash adjuster mechanism is provided between the valve follower 5 and the rocker arm 2 to automatically adjust the valve clearance by operating hydraulic pressure introduced from an oil passage (not shown). Reference numeral 15 is a valve spring, which biases each intake valve 1 in the valve closing direction.
【００１８】図中６はエンジン回転に同期して回転する
カムシャフトであり、このカムシャフト６には軸方向に
カムプロフィールが変化する立体カム７が設けられる。
立体カム７は軸方向前方から後方にかけてリフト量およ
びリフト期間が連続的に増大して形成され、そのカム面
８がカムシャフト６の軸方向に対して傾斜している。立
体カム７の前端部では７ａで低回転域における燃費重視
の特性が得られるプロフィールに、後端部７ｂで高回転
域における出力重視の特性が得られるプロフィールにそ
れぞれ形成される。In the figure, reference numeral 6 denotes a cam shaft which rotates in synchronization with engine rotation, and a solid cam 7 whose cam profile changes in the axial direction is provided on the cam shaft 6.
The solid cam 7 is formed such that the lift amount and the lift period are continuously increased from the front side to the rear side in the axial direction, and the cam surface 8 thereof is inclined with respect to the axial direction of the cam shaft 6. At the front end portion of the three-dimensional cam 7, a profile is formed in which the fuel economy-oriented characteristic is obtained in the low rotation range at 7a, and a profile in which the output emphasis characteristic is obtained at the high rotation region is formed at the rear end portion 7b.
【００１９】立体カム７とロッカアーム２の間には、立
体カム７に転接するローラフォロワ１０と、このローラ
フォロワ１０を回転軸１１と図示しないベアリングを介
して回転自在に支持するサブロッカ１２が設けられる。Between the three-dimensional cam 7 and the rocker arm 2, there are provided a roller follower 10 rollingly contacting the three-dimensional cam 7, and a sub-rocker 12 rotatably supporting the roller follower 10 via a rotary shaft 11 and a bearing (not shown). .
【００２０】サブロッカ１２は、回転軸１１の両端が結
合される端部１２ｂと、ローラフォロワ１０と直交する
円筒形に湾曲する凸部１２ａとを有する。The sub-rocker 12 has an end portion 12b to which both ends of the rotary shaft 11 are joined and a convex portion 12a which is orthogonal to the roller follower 10 and which is curved in a cylindrical shape.
【００２１】ロッカアーム２に円柱形に窪む凹部１３が
形成され、この凹部１３にサブロッカ１２を摺動自在に
嵌合させる。凹部１３は、断面が円弧状に湾曲する曲面
１３ａと、この曲面１３ａの両端に形成される平面状の
端面１３ｂを有する。A cylindrical recess 13 is formed in the rocker arm 2, and the sub rocker 12 is slidably fitted in the recess 13. The concave portion 13 has a curved surface 13a whose section is curved in an arc shape, and flat end surfaces 13b formed at both ends of the curved surface 13a.
【００２２】凹部１３の曲面１３ａの湾曲中心線は、平
面投影図上においてカムシャフト６およびローラフォロ
ワ１０に対して直交するように配置されている。The curved center line of the curved surface 13a of the concave portion 13 is arranged so as to be orthogonal to the camshaft 6 and the roller follower 10 in a plan view.
【００２３】凹部１３の曲面１３ａに対してサブロッカ
１２の凸部１２ａが摺動可能に嵌合し、これによりサブ
ロッカ１２をロッカアーム２に揺動可能に支持する手段
を構成している。なお、このサブロッカをロッカアーム
に揺動可能に支持する手段として、両者を回転軸を介し
て互いに揺動可能に連結することも考えられる。The convex portion 12a of the sub-rocker 12 is slidably fitted to the curved surface 13a of the concave portion 13, thereby constituting means for swingably supporting the sub-rocker 12 on the rocker arm 2. As a means for swingably supporting the sub-rocker on the rocker arm, it is also conceivable to connect both of them to each other via a rotary shaft so that they can swing.
【００２４】カムシャフト６は、シリンダヘッド４の図
示しない軸受の間に、図中黒矢印で示すように回転方
向、並びに図中白抜き矢印で示すように軸方向に変位可
能に支持され、図示しないカムシャフト６の一端には運
転条件に応じてカムシャフト６を軸方向に変位させる駆
動手段が設けられる。この駆動手段としては、例えばク
ランクシャフトの回転力がタイミングベルトを介して伝
達されるカムプーリに対して、カムシャフト６の嵌合量
を油圧力に応じて変化させる油圧アクチュエータ、ある
いは電動モータ等から構成されるアクチュエータが設け
られ、このアクチュエータの作動をエンジンの運転条件
に応じて制御するコントロールユニットが設けられる。
これにより、回転数や負荷の上昇に伴って立体カム７が
前方に移動して、低回転域で立体カム７の前端部７ａが
各吸気弁１の開閉作動に携わり、高回転域で立体カム７
の後端部７ｂが各吸気弁１の開閉作動に携わり、エンジ
ンの高効率化と高出力化の両立がはかられるようになっ
ている。The camshaft 6 is supported between bearings (not shown) of the cylinder head 4 so as to be displaceable in the rotational direction as shown by the black arrow in the figure and in the axial direction as shown by the white arrow in the figure. A drive means for axially displacing the cam shaft 6 according to operating conditions is provided at one end of the cam shaft 6. As the driving means, for example, a hydraulic actuator that changes the fitting amount of the camshaft 6 in accordance with the hydraulic pressure, or an electric motor or the like with respect to a cam pulley to which the rotational force of the crankshaft is transmitted via a timing belt. Is provided, and a control unit for controlling the operation of the actuator according to the operating conditions of the engine is provided.
As a result, the three-dimensional cam 7 moves forward as the number of rotations and the load increase, and the front end portion 7a of the three-dimensional cam 7 is involved in opening and closing the intake valves 1 in the low rotation range, and the three-dimensional cam in the high rotation range. 7
The rear end portion 7b is involved in the opening and closing operation of each intake valve 1 to achieve both high efficiency and high output of the engine.
【００２５】ローラフォロワ１０は各バルブスプリング
１５の付勢力により立体カム７に押付けられるが、ロー
ラフォロワ１０はカムシャフト６の回転に伴って立体カ
ム７に転接しながらロッカアーム２を揺動させるため、
前記従来装置の滑りフォロワに比べて立体カム７とロッ
カアーム２間のフリクションを大幅に低減できる。The roller follower 10 is pressed against the three-dimensional cam 7 by the urging force of each valve spring 15. The roller follower 10 swings the rocker arm 2 while rollingly contacting the three-dimensional cam 7 as the cam shaft 6 rotates.
The friction between the three-dimensional cam 7 and the rocker arm 2 can be greatly reduced as compared with the slip follower of the conventional device.
【００２６】１つのロッカアーム２に２つのバルブフォ
ロワ５を設けて、１つの立体カム７により２本の吸気弁
１を開閉駆動する構成としたため、図示しないカムシャ
フト６の軸受間で可能な限り立体カム７の軸方向の長さ
を大きくすることができる。この結果、立体カム７は前
端部７ａにおける最大リフト量と後端部７ｂにおける最
大リフト量の差を大きくすることができる。また、立体
カム７は回転軸に対するカム面８の傾斜角度を小さくし
て、カムシャフト６を軸方向に移動するアクチュエータ
の駆動力を低減できる。Since one rocker arm 2 is provided with two valve followers 5 and one three-dimensional cam 7 drives the two intake valves 1 to open and close, the three-dimensional configuration is possible between the bearings of the cam shaft 6 (not shown). The axial length of the cam 7 can be increased. As a result, the three-dimensional cam 7 can increase the difference between the maximum lift amount at the front end portion 7a and the maximum lift amount at the rear end portion 7b. Further, the three-dimensional cam 7 can reduce the inclination angle of the cam surface 8 with respect to the rotation axis, and reduce the driving force of the actuator that moves the cam shaft 6 in the axial direction.
【００２７】ローラフォロワ１０が立体カム７にころが
り接触で接触し、ローラフォロワ１０の回転軸１１がサ
ブロッカ１２を介してロッカアーム２上で揺動すること
により、ローラフォロワ１０がカム面８に対して常に平
行に保たれ、ローラフォロワ１０とカム面８の面圧が均
一に分布するため、両者のフリクションを低減できると
ともに偏磨耗を防止できる。The roller follower 10 comes into rolling contact with the three-dimensional cam 7, and the rotary shaft 11 of the roller follower 10 swings on the rocker arm 2 via the sub-rocker 12, whereby the roller follower 10 is moved relative to the cam surface 8. Since they are always kept parallel and the surface pressures of the roller follower 10 and the cam surface 8 are evenly distributed, the friction between them can be reduced and uneven wear can be prevented.
【００２８】サブロッカ１２をロッカアーム２に揺動可
能に支持する手段として、凹部１３の曲面１３ａに対し
てサブロッカ１２の凸部１２ａを摺動可能に嵌合させた
ため、ローラフォロワ１０がロッカアーム２上に大きく
突出することがなく、エンジンのコンパクト化がはかれ
る。As a means for swingably supporting the sub-rocker 12 on the rocker arm 2, since the convex portion 12a of the sub-rocker 12 is slidably fitted to the curved surface 13a of the concave portion 13, the roller follower 10 is mounted on the rocker arm 2. It does not project significantly and the engine can be made compact.
【００２９】また、凹部１３の曲面１３ａの湾曲中心線
がローラフォロワ１０の回転中心線と交差することによ
り、サブロッカ１２の揺動に伴ってローラフォロワ１０
とロッカアーム２間の距離が変動することが抑えられ、
ローラフォロワ１０の揺動角度にかかわらず、立体カム
７のプロフィールに従った弁リフト特性が得られる。Further, since the curved center line of the curved surface 13a of the recess 13 intersects with the rotation center line of the roller follower 10, the roller follower 10 is swung along with the swing of the sub-rocker 12.
The fluctuation of the distance between the and rocker arm 2 is suppressed,
Regardless of the swing angle of the roller follower 10, the valve lift characteristic according to the profile of the solid cam 7 can be obtained.
【００３０】次に、図２に示す他の実施例は、立体カム
７をその回転軸に対するカム面８の傾斜角度が後端部７
ｂで他の部位より比較的に小さくなるように形成するも
のである。Next, in another embodiment shown in FIG. 2, the inclination angle of the three-dimensional cam 7 with respect to the rotation axis of the cam surface 8 is the rear end portion 7.
It is formed so as to be relatively smaller than the other parts in b.
【００３１】この場合、ローラフォロワ１０がカムシャ
フト６の移動に伴って立体カム７の最もリフト量が大き
くなる後端部７ｂへ移行する際に必要なアクチュエータ
の駆動力を低減できる。In this case, the driving force of the actuator required when the roller follower 10 moves to the rear end portion 7b where the lift amount of the three-dimensional cam 7 becomes the largest as the cam shaft 6 moves can be reduced.
【００３２】[0032]
【発明の効果】以上説明したように本発明は、エンジン
回転に同期して回転するカムシャフトと、カムシャフト
の軸方向にカムプロフィールが変化する立体カムと、カ
ムシャフトを運転条件に応じて軸方向に変位させる駆動
手段とを備えるエンジンの可変動弁装置において、複数
の弁に当接する部位をもつロッカアームをエンジン本体
に対して揺動自在に設け、立体カムに転接するローラフ
ォロワを回転自在に支持するサブロッカを設け、ロッカ
アームに対してサブロッカを揺動自在に支持する手段を
設けたため、ローラフォロワを介して立体カム等の偏磨
耗を防止しつつフリクションを低減できるとともに、カ
ムシャフトを軸方向に移動する駆動力を低減でき、立体
カムの実用化に貢献できる。As described above, according to the present invention, a camshaft that rotates in synchronization with engine rotation, a three-dimensional cam having a cam profile that changes in the axial direction of the camshaft, and a camshaft that rotates according to operating conditions. In a variable valve operating system for an engine including a driving means for displacing in a direction, a rocker arm having a portion that abuts a plurality of valves is swingably provided with respect to an engine body, and a roller follower rollingly contacting a three-dimensional cam is rotatable. Since a sub-rocker that supports the sub-rocker is provided so as to swingably support the sub-rocker with respect to the rocker arm, friction can be reduced while preventing uneven wear of the three-dimensional cam and the like via the roller follower, and the cam shaft can be axially moved. The driving force to move can be reduced, which can contribute to the practical application of the three-dimensional cam.
【００３３】また、ロッカアームに対してサブロッカを
揺動自在に支持する手段として、ロッカアームにカムシ
ャフトと直交する方向に中心線をもつ円柱形に窪む凹部
を形成し、この凹部にサブロッカを摺動可能に嵌合させ
たため、エンジンのコンパクト化がはかれる。Further, as means for swingably supporting the sub-rocker with respect to the rocker arm, a concave portion which is recessed into a cylindrical shape having a center line in a direction orthogonal to the cam shaft is formed in the rocker arm, and the sub-rocker slides in the concave portion. Since the fitting is possible, the engine can be made compact.
【００３４】また、立体カムの回転軸に対するカム面の
傾斜角度を、カムプロフィールが大きくなる端部で比較
的に小さくしたため、カムシャフトを軸方向に移動する
駆動力をさらに低減できる。Since the inclination angle of the cam surface with respect to the rotation axis of the three-dimensional cam is relatively small at the end where the cam profile becomes large, the driving force for moving the cam shaft in the axial direction can be further reduced.
【図１】本発明の実施例を示す動弁系の分解図である。FIG. 1 is an exploded view of a valve train showing an embodiment of the present invention.
【図２】他の実施例を示す動弁系の分解図である。FIG. 2 is an exploded view of a valve train showing another embodiment.
【図３】従来例を示す動弁系の断面図である。FIG. 3 is a sectional view of a valve train system showing a conventional example.
１ 吸気弁 ２ ロッカアーム ３ ロッカシャフト ４ シリンダヘッド ５ バルブフォロワ ６ カムシャフト ７ 立体カム １０ ローラフォロワ １１ 回転軸 １２ サブロッカ １３ 凹部 1 intake valve 2 rocker arm 3 rocker shaft 4 cylinder head 5 valve followers 6 camshaft 7 three-dimensional cam 10 Roller Follower 11 rotation axis 12 Sabrocca 13 recess
Claims (3)
ャフトと、カムシャフトの軸方向にカムプロフィールが
変化する立体カムと、カムシャフトを運転条件に応じて
軸方向に変位させる駆動手段とを備えるエンジンの可変
動弁装置において、複数の弁に当接する部位をもつロッ
カアームをエンジン本体に対して揺動自在に設け、立体
カムに転接するローラフォロワを回転自在に支持するサ
ブロッカを設け、ロッカアームに対してサブロッカを揺
動自在に支持する手段を設けたことを特徴とするエンジ
ンの可変動弁装置。1. A camshaft that rotates in synchronism with engine rotation, a three-dimensional cam whose cam profile changes in the axial direction of the camshaft, and drive means that displaces the camshaft in the axial direction according to operating conditions. In a variable valve operating system for an engine, a rocker arm having a portion that comes into contact with a plurality of valves is swingably provided with respect to the engine body, and a sub-rocker that rotatably supports a roller follower that contacts a solid cam is provided. A variable valve operating system for an engine, comprising means for swingably supporting the sub rocker.
自在に支持する手段として、ロッカアームにカムシャフ
トと直交する方向に中心線をもつ円柱形に窪む凹部を形
成し、この凹部にサブロッカを摺動可能に嵌合させたこ
とを特徴とする請求項１記載のエンジンの可変動弁装
置。2. As a means for swingably supporting the sub-rocker with respect to the rocker arm, a recessed portion having a cylindrical shape having a center line in a direction orthogonal to the cam shaft is formed in the rocker arm, and the sub-rocker slides in the recessed portion. The variable valve operating device for an engine according to claim 1, wherein the variable valve operating device is fitted as much as possible.
角度を、カムプロフィールが大きくなる端部で比較的に
小さくしたことを特徴とする請求項１記載のエンジンの
可変動弁装置。3. The variable valve operating system for an engine according to claim 1, wherein the inclination angle of the cam surface with respect to the rotary shaft of the three-dimensional cam is relatively small at the end where the cam profile becomes large.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3175031A JPH0518221A (en) | 1991-07-16 | 1991-07-16 | Variable valve system of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3175031A JPH0518221A (en) | 1991-07-16 | 1991-07-16 | Variable valve system of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0518221A true JPH0518221A (en) | 1993-01-26 |
Family
ID=15989012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3175031A Pending JPH0518221A (en) | 1991-07-16 | 1991-07-16 | Variable valve system of engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0518221A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0932519A (en) * | 1995-07-14 | 1997-02-04 | Otix:Kk | Variable valve system |
| US6915768B2 (en) | 2002-12-24 | 2005-07-12 | Suzuki Motor Corporation | Variable operating valve apparatus for an internal combustion engine |
| US6951195B2 (en) | 2002-11-18 | 2005-10-04 | Toyota Jidosha Kabushiki Kaisha | Variable valve mechanism and intake air amount control apparatus of internal combustion engine |
| DE102007003969A1 (en) * | 2007-01-26 | 2008-07-31 | Schaeffler Kg | Cam valve drive, particularly for internal-combustion engine, has tap rollers arranged in roller recess, which allows separate tilting of tap rollers in support body arranged in another rocker axis |
| DE102014016126A1 (en) * | 2014-10-30 | 2016-05-04 | Man Diesel & Turbo Se | Internal combustion engine and valve train for an internal combustion engine |
| CN106133281A (en) * | 2014-03-27 | 2016-11-16 | 丹尼尔·波默洛 | The variable cam follower pivoted |
-
1991
- 1991-07-16 JP JP3175031A patent/JPH0518221A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0932519A (en) * | 1995-07-14 | 1997-02-04 | Otix:Kk | Variable valve system |
| US6951195B2 (en) | 2002-11-18 | 2005-10-04 | Toyota Jidosha Kabushiki Kaisha | Variable valve mechanism and intake air amount control apparatus of internal combustion engine |
| US6915768B2 (en) | 2002-12-24 | 2005-07-12 | Suzuki Motor Corporation | Variable operating valve apparatus for an internal combustion engine |
| DE102007003969A1 (en) * | 2007-01-26 | 2008-07-31 | Schaeffler Kg | Cam valve drive, particularly for internal-combustion engine, has tap rollers arranged in roller recess, which allows separate tilting of tap rollers in support body arranged in another rocker axis |
| CN106133281A (en) * | 2014-03-27 | 2016-11-16 | 丹尼尔·波默洛 | The variable cam follower pivoted |
| EP3123004A4 (en) * | 2014-03-27 | 2018-02-28 | Daniel G. Pomerleau | Pivoting variable cam follower |
| DE102014016126A1 (en) * | 2014-10-30 | 2016-05-04 | Man Diesel & Turbo Se | Internal combustion engine and valve train for an internal combustion engine |
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