JP3269586B2 - Engine valve timing control device - Google Patents
Engine valve timing control deviceInfo
- Publication number
- JP3269586B2 JP3269586B2 JP07168793A JP7168793A JP3269586B2 JP 3269586 B2 JP3269586 B2 JP 3269586B2 JP 07168793 A JP07168793 A JP 07168793A JP 7168793 A JP7168793 A JP 7168793A JP 3269586 B2 JP3269586 B2 JP 3269586B2
- Authority
- JP
- Japan
- Prior art keywords
- cam
- swing
- valve
- camshaft
- shaft
- 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.)
- Expired - Fee Related
Links
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、エンジンのバルブタイ
ミング制御装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve timing control device for an engine.
【０００２】[0002]
【従来の技術】一般に、エンジンには動弁(吸気弁又は
排気弁)を、クランク軸の回転と同期する所定のタイミ
ングで開閉する動弁機構が設けられる。そして、かかる
動弁機構を備えたエンジンにおいて動弁の最適な開閉タ
イミング(バルブタイミング)及びバルブリフト量は、エ
ンジンの運転状態、例えばエンジン負荷、エンジン回転
数等によって変化する。そこで、近年、運転状態に応じ
て動弁の開閉タイミング及びバルブリフト量を変化させ
るバルブタイミング制御装置を備えたエンジンが種々提
案されている。2. Description of the Related Art Generally, an engine is provided with a valve operating mechanism for opening and closing a valve (an intake valve or an exhaust valve) at a predetermined timing synchronized with the rotation of a crankshaft. In an engine equipped with such a valve operating mechanism, the optimal opening / closing timing (valve timing) and valve lift of the valve operating vary depending on the operating state of the engine, for example, the engine load and the engine speed. Therefore, in recent years, various engines equipped with a valve timing control device that changes the opening / closing timing of a valve and the valve lift amount according to the operating state have been proposed.
【０００３】例えば、クランク軸と同期して回転するカ
ムシャフトにその軸線方向に広がるテーパ状のカム面を
有する回転カムを設ける一方、回転カムのカム面と係合
するテーパ状のカム面を有し回転カムの回転に対応して
揺動する揺動カムと、揺動カムと当接し揺動カムの揺動
に対応して動弁を往復運動させてこれを開閉するロッカ
アームとを設け、揺動カムを油圧機構等を用いてカムシ
ャフト軸線方向に移動させることによりバルブタイミン
グ及びバルブリフト量を変化させるようにしたバルブタ
イミング制御装置が提案されている(例えば、特公昭５
８−３８６０３号公報参照)。For example, a camshaft that rotates in synchronization with a crankshaft is provided with a rotating cam having a tapered cam surface that spreads in the axial direction of the camshaft, and has a tapered cam surface that engages with the cam surface of the rotating cam. A swinging cam that swings in accordance with the rotation of the rotating cam, and a rocker arm that contacts the swinging cam and reciprocates the valve in accordance with the swinging of the swinging cam to open and close the valve. A valve timing control device has been proposed in which a valve timing and a valve lift amount are changed by moving a moving cam in the axial direction of a cam shaft using a hydraulic mechanism or the like (for example, Japanese Patent Publication No.
8-38603).
【０００４】[0004]
【発明が解決しようとする課題】ところで、例えば特公
昭５８−３８６０３号公報に開示されているような従来
のバルブタイミング制御装置では、普通、揺動カムは揺
動軸によって回動可能に支持されるが、回転カムのテー
パ状のカム面と、揺動カムのテーパ状のカム面とが強い
圧力で当接しているので、両カム間にはスラスト方向す
なわち揺動軸軸線方向(カムシャフト軸線方向)の強い力
(スラスト力)が作用し、かかるスラスト力によって揺動
カムの支持機構、例えば揺動カムと揺動軸との結合部等
の耐久性が低下するといった問題がある。By the way, in a conventional valve timing control device disclosed in Japanese Patent Publication No. 58-38603, for example, the swing cam is normally supported rotatably by a swing shaft. However, since the tapered cam surface of the rotating cam and the tapered cam surface of the oscillating cam are in contact with strong pressure, the thrust direction, that is, the oscillating axis direction (the camshaft axis Direction) strong force
(Thrust force) acts, and there is a problem that the durability of the supporting mechanism of the swing cam, for example, the coupling portion between the swing cam and the swing shaft, is reduced by the thrust force.
【０００５】本発明は、上記従来の問題点を解決するた
めになされたものであって、カムシャフトに設けられた
テーパ状のカム面を有する回転カムによって揺動カムが
揺動させられるようになったバルブタイミング制御装置
に対して、揺動カム支持機構の耐久性を高めることがで
きる手段を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is intended to allow a swing cam to swing by a rotating cam having a tapered cam surface provided on a cam shaft. It is an object of the present invention to provide a means for increasing the durability of a swing cam support mechanism for a valve timing control device that has been used.
【０００６】[0006]
【課題を解決するための手段】本発明は、上記の目的を
達するため、（ｉ）エンジン本体側に設けられた複数の
軸受部によって回転自在に支持され、かつカムシャフト
軸線方向に広がるテーパ状のカム面を有する回転カムが
設けられたカムシャフトと、（ii）回転カムのテーパ状
のカム面と係合するカム面を備え回転カムによって揺動
させられる一方、動弁側と当接して揺動に伴って動弁を
往復運動させる揺動カムと、（iii）カムシャフト軸線
方向に延びて揺動カムを回動可能に支持する揺動軸と、
（iv）カムシャフトをその軸線方向の前方又は後方へ移
動させる駆動装置とが設けられていて、（ｖ）エンジン
の運転状態に応じて駆動装置を作動させ、カムシャフト
をその軸線方向に移動させることにより動弁のリフト量
を変化させるとともに、（vi）揺動軸が、該揺動軸の軸
線方向において隣合う２つの軸受部にわたって配置され
て両軸受部によって支持され、（vii）揺動カムが、揺
動軸に外嵌された筒状の支持部材によって支持され、(v
iii)該支持部材における揺動軸の軸線方向の前後両端部
が、隣合う２つの軸受部の側面にそれぞれ当接させられ
ていることを特徴とするエンジンのバルブタイミング制
御装置を提供する。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides: (i) a tapered shape which is rotatably supported by a plurality of bearings provided on the engine body side and expands in the camshaft axial direction. A cam shaft provided with a rotating cam having a cam surface of (i), and (ii) a cam surface engaging with a tapered cam surface of the rotating cam, and being swung by the rotating cam, while being in contact with the valve operating side. An oscillating cam that reciprocates a valve with the oscillating motion, and (iii) an oscillating shaft that extends in the camshaft axis direction and rotatably supports the oscillating cam.
(Iv) a drive device for moving the camshaft forward or backward in the axial direction thereof, and (v) operating the drive device in accordance with the operation state of the engine to move the camshaft in the axial direction. (Vi) the oscillating shaft is disposed over two adjacent bearings in the axial direction of the oscillating shaft and supported by the two bearings, and (vii) oscillating. The cam is supported by a cylindrical support member externally fitted to the swing shaft, and (v
iii) An engine valve timing control device, wherein both front and rear ends in the axial direction of the swing shaft of the support member are respectively in contact with side surfaces of two adjacent bearing portions.
【０００７】[0007]
【実施例】以下、図１〜図３を参照しつつ本発明の実施
例を具体的に説明する。なお、以下では便宜上図１又は
図２における左側をエンジン前側にあたるので単に「前」
といい、図１又は図２における右側をエンジン後側にあ
たるので単に「後」ということにする。図１〜図３に示す
ように、エンジンＥのシリンダヘッド１の上端部近傍に
は、前側から後側に向かって順に、夫々縦壁状の第１〜
第３軸受部２〜４が設けられ、これらの第１〜第３軸受
部２〜４によって、吸気弁用のカムシャフト６が回転自
在に支持されている。なお、シリンダヘッド１の後端部
にはバルブタイミング制御装置Ｓを支持するための第４
軸受部５が設けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS. In the following, for convenience, the left side in FIG. 1 or FIG.
The right side in FIG. 1 or FIG. 2 corresponds to the rear side of the engine, and is simply referred to as “rear”. As shown in FIGS. 1 to 3, in the vicinity of the upper end portion of the cylinder head 1 of the engine E, first to first vertical wall-shaped portions are sequentially arranged from the front side to the rear side.
Third bearing portions 2 to 4 are provided, and the first to third bearing portions 2 to 4 rotatably support a camshaft 6 for an intake valve. A fourth end for supporting the valve timing control device S is provided at the rear end of the cylinder head 1.
A bearing part 5 is provided.
【０００８】次に、カムシャフト６の具体的な支持構造
ないしは駆動構造を説明する。カムシャフト６の前端部
にはカムスプロケット７が取り付けられ、このカムスプ
ロケット７は第１軸受部２に形成された第１カムシャフ
ト支持部２aによって回転自在に支持されている。さら
に、カムシャフト６は、夫々第２,第３軸受部３,４に形
成された第２,第３カムシャフト支持部３a,４aによって
回転自在にかつ直接的に支持されている。ここで、カム
シャフト６とカムスプロケット７とは嵌合部８で互いに
スプライン嵌合され、両者６,７は一体的に回転するよ
うになっているが、カムシャフト６はカムスプロケット
７に対して前後方向(カムシャフト軸線方向)に相対的に
変位できるようになっている。そして、カムスプロケッ
ト７は、図示していないクランクプーリ、タイミングベ
ルト等を介してクランク軸によってこれと同期して回転
駆動され、これによってカムシャフト６がクランク軸と
同期して回転するようになっている。Next, a specific supporting structure or driving structure of the camshaft 6 will be described. A cam sprocket 7 is attached to the front end of the camshaft 6, and the cam sprocket 7 is rotatably supported by a first camshaft support 2 a formed on the first bearing 2. Further, the camshaft 6 is rotatably and directly supported by second and third camshaft support portions 3a and 4a formed on the second and third bearing portions 3 and 4, respectively. Here, the camshaft 6 and the cam sprocket 7 are spline-fitted to each other at the fitting portion 8 so that the two 6, 7 rotate integrally. It can be relatively displaced in the front-rear direction (camshaft axis direction). Then, the cam sprocket 7 is rotationally driven in synchronization with the crankshaft via a crank pulley, a timing belt, and the like (not shown), whereby the camshaft 6 rotates in synchronization with the crankshaft. I have.
【０００９】以下、動弁の駆動機構を説明する。前後方
向(カムシャフト軸線方向)にみて第２軸受部３と第３軸
受部４との間においてカムシャフト６には、夫々第１,
第２吸気弁９,１０を所定のタイミングで開閉させる第
１,第２吸気弁用カム１１,１２が設けられている。ここ
で、第１,第２吸気弁用カム１１,１２のカム面は夫々、
後方に向かって広がるテーパ状とされているが、第２吸
気弁用カム１２のカム面は第１吸気弁用カム１１のカム
面よりもテーパが緩やかに設定されている。なお、第
１,第２吸気弁９,１０は請求項１に記載された「動弁」に
相当し、第１,第２吸気弁用カム１１,１２は請求項１に
記載された「回転カム」に相当する。Hereinafter, the drive mechanism of the valve train will be described. When viewed in the front-rear direction (the direction of the camshaft axis), the camshaft 6 is provided with the first and third bearings between the second bearing 3 and the third bearing 4 respectively.
First and second intake valve cams 11, 12 for opening and closing the second intake valves 9, 10 at a predetermined timing are provided. Here, the cam surfaces of the first and second intake valve cams 11 and 12 are respectively
The cam surface of the second intake valve cam 12 is tapered more gradually than the cam surface of the first intake valve cam 11 although it is tapered toward the rear. Note that the first and second intake valves 9 and 10 correspond to the "valve operation" described in claim 1, and the first and second intake valve cams 11 and 12 correspond to the "rotation" described in claim 1. Cam ".
【００１０】そして、第１,第２吸気弁用カム１１,１２
のカム面は夫々第１,第２揺動カム１３,１４のカム面と
当接し、さらに第１,第２揺動カム１３,１４は夫々第
１,第２吸気弁９,１０の上端部に設けられた第１,第２
当接部材１５,１６と当接している。ここで、第１,第２
揺動カム１３,１４のカム面は夫々、第１,第２吸気弁用
カム１１,１２のテーパ状のカム面に対応するテーパ状
とされている。第１,第２揺動カム１３,１４は後で説明
するように、夫々揺動軸１８によって、第１,第２支持
部材１９,２０を介して回動可能に支持されている。な
お、揺動軸１８内には作動油供給通路２１が設けられて
いる。The first and second intake valve cams 11, 12
Are in contact with the cam surfaces of the first and second swing cams 13 and 14, respectively. Further, the first and second swing cams 13 and 14 are upper end portions of the first and second intake valves 9 and 10, respectively. The first and second provided in
It is in contact with the contact members 15 and 16. Here, the first and second
The cam surfaces of the swing cams 13 and 14 are tapered corresponding to the tapered cam surfaces of the first and second intake valve cams 11 and 12, respectively. The first and second swing cams 13 and 14 are rotatably supported by swing shafts 18 via first and second support members 19 and 20, respectively, as described later. Note that a working oil supply passage 21 is provided in the swing shaft 18.
【００１１】ここで、カムシャフト６が回転するとこれ
に伴って第１,第２吸気弁用カム１１,１２が回転し、こ
のとき第１,第２吸気弁用カム１１,１２によって夫々第
１,第２揺動カム１３．１４が揺動軸１８まわりに揺動
させられる。そして、第１,第２揺動カム１３,１４が揺
動すると、これに伴って第１,第２吸気弁９,１０が上下
方向に往復運動させられ、これによって第１,第２吸気
弁９,１０が所定のタイミング及びバルブリフト量で開
閉されるようになっている。Here, when the camshaft 6 rotates, the first and second intake valve cams 11 and 12 rotate accordingly, and at this time, the first and second intake valve cams 11 and 12 respectively cause the first and second intake valve cams 11 and 12 to rotate. The second swing cam 13.14 is swung about the swing shaft 18. When the first and second swing cams 13 and 14 swing, the first and second intake valves 9 and 10 are reciprocated in the up and down direction, whereby the first and second intake valves are moved. 9 and 10 are opened and closed at a predetermined timing and a valve lift amount.
【００１２】そして、前記したとおり、第１,第２吸気
弁用カム１１,１２のカム面が後方に向かって広がるテ
ーパ状とされているので、第１,第２揺動カム１３,１４
を第１,第２吸気弁用カム１１,１２の前部に当接させる
かそれとも後部に当接させるかを切り替えることによっ
てバルブタイミングないしはバルブリフト量を切り替え
ることができる。すなわち、カムシャフト６を所定の前
方位置に配置すると、第１,第２揺動カム１３,１４は第
１,第２吸気弁用カム１１,１２の後部、すなわちカム径
が大きい部分に当接し(図１はこの状態を示している)、
このとき第１,第２吸気弁９,１０はカム径の大きいカム
面後部に対応する所定のバルブタイミング及びバルブリ
フト量で開閉されることになる。As described above, since the cam surfaces of the first and second intake valve cams 11 and 12 are tapered so as to extend rearward, the first and second swing cams 13 and 14 are formed.
The valve timing or the valve lift can be switched by switching between contacting the front and rear portions of the first and second intake valve cams 11 and 12 with each other. That is, when the camshaft 6 is disposed at a predetermined front position, the first and second swing cams 13 and 14 come into contact with the rear portions of the first and second intake valve cams 11 and 12, that is, portions where the cam diameter is large. (FIG. 1 shows this state),
At this time, the first and second intake valves 9 and 10 are opened and closed at a predetermined valve timing and a valve lift corresponding to the rear portion of the cam surface having a large cam diameter.
【００１３】他方、カムシャフト６を所定の後方位置に
配置すると、第１,第２揺動カム１３,１４は第１,第２
吸気弁用カム１１,１２の前部すなわちカム径が小さい
部分に当接し、このとき第１,第２吸気弁９,１０はカム
径の小さカム面前部に対応する所定のバルブタイミング
及びバルブリフト量で開閉されることになる。なお、カ
ムシャフト６の前方又は後方への移動(変位)は、バルブ
タイミング制御装置Ｓによって、エンジンＥの運転状態
に応じて行なわれる。On the other hand, when the camshaft 6 is arranged at a predetermined rear position, the first and second swing cams 13 and 14 become the first and second swing cams.
The front portions of the intake valve cams 11 and 12, that is, portions where the cam diameter is small, abut the first and second intake valves 9 and 10 at a predetermined valve timing and valve lift corresponding to the front portion of the small cam surface. It will be opened and closed by the amount. The movement (displacement) of the camshaft 6 forward or backward is performed by the valve timing control device S according to the operating state of the engine E.
【００１４】以下、第１,第２揺動カム１３,１４の支持
機構について説明する。第１揺動カム１３は揺動軸１８
に外嵌された略円筒状の第１支持部材１９と一体形成さ
れ、他方第２揺動カム１４は揺動軸１８に外嵌された略
円筒状の第２支持部材２０と一体形成されている。ここ
で、第１,第２支持部材１９,２０は夫々前方及び後方に
向かって延設され、第１支持部材１９の前端部は第２軸
受部３の後端面に当接し、第２支持部材２０の後端部は
第３軸受部４の前端面に当接し、かつ第１支持部材１９
の後端部と第２支持部材２０の前端部とは互いに当接し
ている。したがって、第１,第２支持部材１９,２０を一
体的にとらえれば、支持部材１９,２０の前端部と後端
部とが、夫々第２軸受部３の後端面と第３軸受部４の前
端面とに当接して位置決めされていることになる。The mechanism for supporting the first and second swing cams 13 and 14 will be described below. The first swing cam 13 has a swing shaft 18.
The second swing cam 14 is formed integrally with a substantially cylindrical second support member 20 fitted externally to the swing shaft 18, while the second swing cam 14 is formed integrally with a substantially cylindrical first support member 19 fitted outside. I have. Here, the first and second support members 19 and 20 extend forward and rearward, respectively, and the front end of the first support member 19 abuts the rear end surface of the second bearing portion 3, and the second support member The rear end of the first bearing member 20 contacts the front end surface of the third bearing portion 4 and
And the front end of the second support member 20 are in contact with each other. Therefore, if the first and second support members 19 and 20 are integrally captured, the front end and the rear end of the support members 19 and 20 will be the rear end face of the second bearing 3 and the third bearing 4 respectively. This means that it is positioned in contact with the front end face.
【００１５】前記したとおり、第１吸気弁用カム１１の
カム面は後方に向かって広がるテーパ状とされ、これと
当接する第１揺動カム１３のカム面もテーパ状とされ、
かつ第１吸気弁用カム１１と第１揺動カム１３とは互い
に強い圧力で当接させられているので、第１吸気弁用カ
ム１１には後向きの強いスラスト力が作用する一方、第
１揺動カム１３には前向きの強いスラスト力が作用す
る。しかしながら、第１揺動カム１３は第１支持部材１
９と一体形成され、この第１支持部材１９の前端部が第
２軸受部３の後端面と当接しているので、結局第１揺動
カム１３に作用する前向きの強いスラスト力は第２軸受
部３によって受け止められることになる。したがって、
第１揺動カム１３の支持機構を構成する各部材間、例え
ば第１揺動カム１３(第１支持部材１９)と揺動軸１８と
の間には強い力が作用せず、第１揺動カム１３の支持機
構の耐久性が高められる。As described above, the cam surface of the first intake valve cam 11 is tapered so as to widen rearward, and the cam surface of the first swing cam 13 which is in contact with the cam surface is also tapered.
Further, since the first intake valve cam 11 and the first swing cam 13 are in contact with each other with a strong pressure, a strong rearward thrust force acts on the first intake valve cam 11 while the first A strong forward thrust force acts on the swing cam 13. However, the first swing cam 13 is not supported by the first support member 1.
9 and the front end of the first support member 19 is in contact with the rear end surface of the second bearing portion 3, so that the strong forward thrust force acting on the first swing cam 13 is eventually increased by the second bearing 3. It will be received by the part 3. Therefore,
A strong force does not act between the members constituting the support mechanism of the first swing cam 13, for example, between the first swing cam 13 (first support member 19) and the swing shaft 18, and the first swing cam 13 The durability of the support mechanism for the moving cam 13 is enhanced.
【００１６】同様に、第２揺動カム１４にも前向きの強
いスラスト力が作用するが、このスラスト力は第２支持
部材２０と第１支持部材１９とを介して第２軸受部３に
よって受け止められるので、第２揺動カム１４の支持機
構を構成する各部材間にも強い力が作用せず、第２揺動
カム１４の支持機構の耐久性も高められる。したがっ
て、本実施例によれば、揺動カム支持機構全体としての
耐久性が高められ、カムシャフト６の支持・駆動機構な
いしはバルブタイミング制御装置Ｓの信頼性が高められ
る。Similarly, a strong forward thrust force acts on the second swing cam 14, but this thrust force is received by the second bearing 3 via the second support member 20 and the first support member 19. Therefore, a strong force does not act between the members constituting the support mechanism of the second swing cam 14, and the durability of the support mechanism of the second swing cam 14 is also enhanced. Therefore, according to the present embodiment, the durability of the entire swing cam support mechanism is enhanced, and the reliability of the cam shaft 6 support / drive mechanism or the valve timing control device S is enhanced.
【００１７】[0017]
【発明の作用・効果】一般に、回転カムのカム面をカム
シャフト軸線方向に広がるテーパ状とし、かつ揺動カム
のカム面を上記テーパに対応するテーパ状とした場合
は、揺動カムにカムシャフト軸線方向の強いスラスト力
が作用する。しかしながら、本発明によれば、揺動カム
に作用するスラスト力が支持部材を介して、支部部材前
後の両軸受部によって受け止められるので、揺動カムの
支持機構を構成する各部材間、例えば揺動カムと揺動軸
との間に強い力が作用せず、揺動カム支持機構の耐久性
が高められ、カムシャフトの支持・駆動機構ないしはバ
ルブタイミング制御装置の信頼性が高められる。In general, when the cam surface of the rotary cam is tapered so as to expand in the axial direction of the camshaft, and the cam surface of the swing cam is tapered corresponding to the above-mentioned taper, the cam is attached to the swing cam. A strong thrust force acts in the shaft axis direction. However, according to the present invention, since the thrust force acting on the swing cam is received by the two bearing portions at the front and rear of the support member via the support member, the thrust force acting between the members constituting the swing cam support mechanism, for example, the swing Since no strong force acts between the moving cam and the swing shaft, the durability of the swing cam support mechanism is increased, and the reliability of the cam shaft support / drive mechanism or the valve timing control device is enhanced.
【図１】 本発明にかかるバルブタイミング制御装置を
備えたエンジンの吸気弁用カムシャフトまわりの一部断
面側面説明図である。FIG. 1 is an explanatory side view partially in section around an intake valve camshaft of an engine equipped with a valve timing control device according to the present invention.
【図２】 図１に示すエンジンの吸気弁用カムシャフト
まわりの平面説明図である。FIG. 2 is an explanatory plan view of the vicinity of a camshaft for an intake valve of the engine shown in FIG. 1;
【図３】 図１に示すエンジンの第１吸気弁用カム付近
における縦断面説明図である。FIG. 3 is an explanatory longitudinal sectional view of the vicinity of a first intake valve cam of the engine shown in FIG. 1;
Ｅ…エンジン Ｓ…バルブタイミング制御装置 ２〜４…第１〜第３軸受部 ６…カムシャフト ９,１０…第１,第２吸気弁 １１,１２…第１,第２吸気弁用カム １３,１４…第１,第２揺動カム １８…揺動軸 １９,２０…第１,第２支持部材 E: engine S: valve timing control device 2-4: first to third bearings 6: camshaft 9, 10, first and second intake valves 11, 12, ... cams for first and second intake valves 13, 14 first and second swing cams 18 swing shafts 19 and 20 first and second support members
───────────────────────────────────────────────────── フロントページの続き (72)発明者 浅井 晃 広島県安芸郡府中町新地３番１号 マツ ダ株式会社内 (56)参考文献 特開 昭55−148912（ＪＰ，Ａ) 特開 平４−179808（ＪＰ，Ａ) 特開 平２−221620（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) F01L 13/00 301 F01L 1/04 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Asai 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (56) References JP-A-55-148912 (JP, A) JP-A-4 -179808 (JP, A) JP-A-2-221620 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) F01L 13/00 301 F01L 1/04
Claims (1)
部によって回転自在に支持され、かつカムシャフト軸線
方向に広がるテーパ状のカム面を有する回転カムが設け
られたカムシャフトと、 回転カムのテーパ状のカム面と係合するカム面を備え回
転カムによって揺動させられる一方、動弁側と当接して
揺動に伴って動弁を往復運動させる揺動カムと、カムシャフト軸線方向に延びて 揺動カムを回動可能に支
持する揺動軸と、 カムシャフトをその軸線方向の前方又は後方へ移動させ
る駆動装置と が設けられていて、エンジンの運転状態に応じて駆動装置を作動させ、カム
シャフトをその軸線方向に移動させることにより動弁の
リフト量を変化させるとともに、 揺動軸が、該揺動軸の軸線方向において隣合う２つの軸
受部にわたって配置されて両軸受部によって支持され、 揺動カムが、揺動軸に外嵌された筒状の支持部材によっ
て支持され、 該支持部材における揺動軸の軸線方向の前後両端部が、
隣合う２つの軸受部の側面にそれぞれ当接させられてい
ることを特徴とするエンジンのバルブタイミング制御装
置。1. A camshaft provided with a rotating cam rotatably supported by a plurality of bearings provided on an engine body side and having a tapered cam surface extending in a camshaft axial direction ; while is oscillated by rotating cam includes a cam surface engaging the tapered cam surface, a swing cam for reciprocating the valve operating with the rocking contact with the valve operating side those, the cam shaft axis direction An oscillating shaft extending to rotatably support the oscillating cam, and moving the camshaft forward or backward in the axial direction.
A driving device that operates the driving device according to the operating state of the engine,
By moving the shaft in its axial direction, the valve
Along with changing the lift amount, the swing shaft is disposed over two bearing portions adjacent to each other in the axial direction of the swing shaft and supported by the two bearing portions, and the swing cam is fitted around the swing shaft. Both ends in the axial direction of the swing shaft of the support member are supported by a cylindrical support member ,
A valve timing control device for an engine, wherein the valve timing control device is in contact with side surfaces of two adjacent bearing portions .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07168793A JP3269586B2 (en) | 1993-03-30 | 1993-03-30 | Engine valve timing control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07168793A JP3269586B2 (en) | 1993-03-30 | 1993-03-30 | Engine valve timing control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06280524A JPH06280524A (en) | 1994-10-04 |
| JP3269586B2 true JP3269586B2 (en) | 2002-03-25 |
Family
ID=13467721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07168793A Expired - Fee Related JP3269586B2 (en) | 1993-03-30 | 1993-03-30 | Engine valve timing control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3269586B2 (en) |
-
1993
- 1993-03-30 JP JP07168793A patent/JP3269586B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06280524A (en) | 1994-10-04 |
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