JP2761949B2 - Valve opening / closing device for 4-cycle engine - Google Patents
Valve opening / closing device for 4-cycle engineInfo
- Publication number
- JP2761949B2 JP2761949B2 JP30645989A JP30645989A JP2761949B2 JP 2761949 B2 JP2761949 B2 JP 2761949B2 JP 30645989 A JP30645989 A JP 30645989A JP 30645989 A JP30645989 A JP 30645989A JP 2761949 B2 JP2761949 B2 JP 2761949B2
- Authority
- JP
- Japan
- Prior art keywords
- eccentric
- cam
- camshaft
- valve
- peripheral surface
- 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
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、４サイクルエンジンの弁開放装置に関し、
特に、吸排気弁の開閉時期をエンジンの運転状態に応じ
て適正に調整できるようにした弁開閉装置に関する。The present invention relates to a valve opening device for a four-stroke engine,
In particular, the present invention relates to a valve opening / closing device capable of appropriately adjusting the opening / closing timing of an intake / exhaust valve in accordance with an operating state of an engine.
従来技術 ４サイクルエンジンにおいては、高速域で弁開閉時期
を早めるとともに弁閉塞時期を遅らせて、バルブオーバ
ラップ期間（吸排気弁が同時に開放されている期間）を
長期化し、吸排気の慣性効果を利用し吸排気効率を高め
てエンジンの高出力化を図り、また低速域では弁開放時
期を遅らせるとともに弁閉塞時期を早めて、バルブオー
バラップ期間を短縮化し、排気再循環、吸気の吹き抜け
を防止してエンジンの出力低下を避けることが行われて
おり、このため、従来、種々の可変バルブタイミング動
弁装置が提案されている。2. Description of the Related Art In a four-stroke engine, the valve opening / closing timing is advanced and the valve closing timing is delayed in a high-speed region to prolong a valve overlap period (a period in which the intake and exhaust valves are simultaneously opened), thereby reducing the inertia effect of intake and exhaust. In order to increase the output of the engine by increasing the intake and exhaust efficiency, the valve opening time is delayed and the valve closing time is advanced in the low speed range, the valve overlap period is shortened, and exhaust recirculation and intake air blow-through are prevented. Accordingly, various variable valve timing valve operating devices have been conventionally proposed.
例えば本出願人の出願に係る特開昭63−1707号公報に
記載されている４サイクルエンジンのバルブ開閉機構に
おいては、バルブ開閉用カムを回転自在に嵌装したカム
シャフト内に軸線方向に偏心シャフトが嵌挿され、該偏
心シャフトの偏心軸部の外周面に接して転動自在に複数
のローラが配設され、これらのローラはカムシャフトに
設けられた各ローラ保持窓を抜けてカムシャフトから半
径方向外方へ突出している。そしてこれらのローラの外
周に偏心カラーが嵌合され、前記偏心シャフトをカムシ
ャフトに相対的に回転させることにより、前記偏心軸
部、ローラを介して偏心カラーがカムシャフトに対し偏
心するようになっている。カムシャフトが回転すると、
この回転が該カムシャフトと一体で偏心カラーの半径方
向の溝に摺接している係合突起を介して偏心カラーに伝
えられ、偏心カラーがその偏心した中心軸線のまわりに
回転し、この偏心カラーの回転が、前記半径方向の溝に
同一直径上で向かいあっている他の半径方向溝に摺接し
ているカム側の係合突起を介してバルブ開閉カムに伝え
られ、該カムがカムシャフトの軸線まわりに回転する。
この結果、カムシャフトの回転とバルブ開閉用カムの回
転との間に周期的な位相差が生じ、かつこの位相差の発
生状態は偏心カラーの偏心状態に応じて変化するので、
エンジンの運転状態に応じて偏心カラーの偏心量を調節
することにより、カムシャフトとバルブ開閉用カムとの
間に所望の回転位相差を生じさせて、弁開閉時期を適正
に調整することができる。For example, in a valve opening / closing mechanism of a four-cycle engine described in Japanese Patent Application Laid-Open No. 63-1707, filed by the present applicant, an eccentric shaft is eccentrically mounted in a camshaft in which a valve opening / closing cam is rotatably fitted. A plurality of rollers are disposed rotatably in contact with the outer peripheral surface of the eccentric shaft portion of the eccentric shaft, and these rollers pass through the respective roller holding windows provided on the camshaft, and are inserted into the camshaft. Projecting outward in the radial direction. An eccentric collar is fitted around the outer periphery of these rollers, and the eccentric shaft is rotated relative to the camshaft, so that the eccentric collar is eccentric to the camshaft via the eccentric shaft portion and the roller. ing. When the camshaft rotates,
This rotation is transmitted to the eccentric collar via an engagement protrusion slidingly contacting the radial groove of the eccentric collar integrally with the camshaft, and the eccentric collar rotates about its eccentric central axis, and the eccentric collar rotates. Is transmitted to the valve opening / closing cam via a cam-side engaging projection that is in sliding contact with another radial groove facing the radial groove on the same diameter, and the cam is connected to the camshaft. Rotate around the axis.
As a result, a periodic phase difference occurs between the rotation of the camshaft and the rotation of the cam for opening and closing the valve, and the state of occurrence of this phase difference changes according to the eccentric state of the eccentric collar.
By adjusting the amount of eccentricity of the eccentric collar according to the operating state of the engine, a desired rotational phase difference is generated between the camshaft and the valve opening / closing cam, so that the valve opening / closing timing can be appropriately adjusted. .
しかしこのバルブ開閉機構においては、偏心カラーが
その内周面を軸受面としてローラを介して偏心シャフト
に支持されているので、軸受面積が小さく従って大きな
軸受荷重が作用し、偏心カラー、ローラ、偏心シャフト
の耐久性に影響する。However, in this valve opening / closing mechanism, since the eccentric collar is supported on the eccentric shaft via the roller with its inner peripheral surface as the bearing surface, the bearing area is small, so a large bearing load acts, and the eccentric collar, the roller, the eccentric It affects the durability of the shaft.
また、偏心カラーの偏心度の調節は、カムシャフトの
中心部を貫通する偏心シャフトにより行われるので、１
本のカムシャフトに多数のバルブ開閉用カムが設けられ
ている多気筒エンジンに上記のようなバルブ開閉機構を
適用することは困難である。Further, since the adjustment of the eccentricity of the eccentric collar is performed by the eccentric shaft penetrating the center of the camshaft,
It is difficult to apply the above-described valve opening / closing mechanism to a multi-cylinder engine in which many cams for valve opening / closing are provided on a camshaft.
特開昭59−131715号公報には、カム駆動軸の中途に前
記と原理的に同様な偏心連結機構を挿入したエンジンカ
ムシャフト駆動機構が示されている。この機構において
は、前記の偏心カラーに相当する偏心ディスクが環状の
ヨークの内周面に回転自在に嵌着されており、該ヨーク
をカム駆動軸に対して直角方向に移動させることにより
偏心ディスクの偏心量を調節するようになっている。JP-A-59-131715 discloses an engine camshaft drive mechanism in which an eccentric connection mechanism similar to the above is inserted in the middle of a cam drive shaft. In this mechanism, an eccentric disk corresponding to the eccentric collar is rotatably fitted to the inner peripheral surface of an annular yoke, and the eccentric disk is moved by moving the yoke in a direction perpendicular to the cam drive shaft. The amount of eccentricity is adjusted.
このエンジンカムシャフト駆動機構においては、偏心
ディスクはその外周面を環状ヨークによって包囲され支
承されているので、軸受面積が広くなり、偏心ディスク
の耐久性上有利である。しかし偏心ディスクの偏心量の
調節がヨークを直径方向に直線状に変位させることによ
り行われるので、偏心量の調節に比較的大きな力を必要
とし、また偏心量を微妙にかつ連続的に調節することが
難しい。さらに、上記ヨークはカム駆動軸の回転に伴い
半径方向および回転方向への力を受けるため、この力に
対向してヨークを確固と固定する必要があり、ヨークが
僅かでも移動すると、弁開閉時期が大巾に狂ってしま
う。このため、ヨークの位置を正確に設定するととも
に、これを確固と固定する機構が不可欠となり、構造が
複雑化して大型化する。In this engine camshaft drive mechanism, the eccentric disk is surrounded and supported on its outer peripheral surface by the annular yoke, so that the bearing area is increased, which is advantageous in terms of the durability of the eccentric disk. However, since the adjustment of the amount of eccentricity of the eccentric disk is performed by linearly displacing the yoke in the diameter direction, a relatively large force is required to adjust the amount of eccentricity, and the amount of eccentricity is finely and continuously adjusted. It is difficult. Further, since the yoke receives forces in the radial direction and the rotational direction with the rotation of the cam drive shaft, it is necessary to firmly fix the yoke in opposition to this force. Gets crazy. Therefore, a mechanism for accurately setting the position of the yoke and firmly fixing the yoke is indispensable, and the structure is complicated and the size is increased.
実開昭57−198306号公報にも、カムとカムシャフトと
の間に同様な偏心連結機構を挿入した吸排気弁駆動制御
装置が示されているが、この装置は、カムシャフトに設
けられたフランジとカムとの間に位置してカムシャフト
の軸心に対して偏心回動自在に配設した制御環と、この
制御環に同心的かつ回転自在に収接されたディスクと、
このディスクの異なった位置に設けたピンと、これらの
ピンを受け入れるように前記フランジおよびカムに各々
設けた溝部とを備えている。上記制御環はその外周に歯
車部を有するとともに、該歯車部と直径上相対向する位
置に設けられた支点においてエンジン本体に揺動可能に
支持されており、前記歯車部に噛合う歯車の回転によっ
て前記支点を中心として揺動し、これにより前記ディス
クが制御環とともにカムシャフトの軸心に対して偏心す
るようになっている。しかしこの制御環は前記歯車部と
支点だけで固定されているので、その固定が十分でな
く、運転中に設定位置が変動して弁開閉時期に狂いが生
じ易い。Japanese Utility Model Laid-Open Publication No. 57-198306 also discloses an intake / exhaust valve drive control device in which a similar eccentric connection mechanism is inserted between a cam and a camshaft. This device is provided on a camshaft. A control ring located between the flange and the cam and eccentrically rotatable with respect to the axis of the camshaft, and a disc concentrically and rotatably mounted on the control ring,
Pins are provided at different locations on the disk and grooves are provided in the flange and cam to receive the pins. The control ring has a gear portion on its outer periphery, and is swingably supported by the engine body at a fulcrum provided at a position diametrically opposite to the gear portion, and rotates the gear meshing with the gear portion. Causes the disk to swing about the fulcrum, whereby the disk is eccentric with the control ring with respect to the axis of the camshaft. However, since this control ring is fixed only by the gear portion and the fulcrum, the fixation is not sufficient, and the set position fluctuates during operation, and the valve opening / closing timing is likely to be out of order.
解決しようとする課題 本発明は、上述したような従来装置の問題点を克服
し、偏心部材の軸受面積を増大して耐久性を向上させる
とともに、該偏心部材を設定位置にしっかりと回転自在
に固定して弁開閉時期の狂いを防止することができ、し
かも比較的小型、簡単な装置で偏心部材の偏心位置を精
密かつ容易に調節することができる４サイクルエンジン
の弁開閉装置を提供しようとするものである。The present invention overcomes the above-mentioned problems of the conventional device, increases the bearing area of the eccentric member, improves the durability, and allows the eccentric member to rotate firmly to a set position. An object of the present invention is to provide a valve opening / closing device for a four-stroke engine, which can be fixed to prevent the valve opening / closing timing from being disordered, and in which the eccentric position of the eccentric member can be adjusted precisely and easily with a relatively small and simple device. Is what you do.
課題を解決するための手段および作用 このため、本発明においては、クランク軸に同期して
回転駆動されるカム軸に動弁カム部材を回転自在に嵌装
し、該カム軸と動弁カム部材との間にカム軸に対して偏
心可能な偏心部材を介在させ、前記カム軸および動弁カ
ム部材をそれぞれ前記偏心部材に半径方向の溝とこの溝
に係合する係合突起とから成る連結機構を介して連結
し、前記偏心部材の偏心により前記カム軸に対する前記
動弁カム部材の回転位相を周期的に変化させて弁開閉時
期を調整し得るようにした４サイクルエンジンの弁開閉
装置において、前記動弁カム部材の端部を回転自在に支
承するとともに該動弁カム部材を介して前記カム軸を支
持するカムホルダの端面外周部に前記カム軸と同心の内
周面を有する受け部を突設し、前記内周面と同径の外周
面を有し該外周面に対して偏心した内孔を有するカラー
部材を前記受け部の内周面に回転自在に嵌装し、該カラ
ー部材の前記内孔に、前記カム軸をその外周面との間に
隙間を介して包囲する円環状の偏心板を回転自在に嵌着
し、該偏心板を前記カム軸および動弁カムにそれぞれ前
記連結機構を介して連結し、かつ前記カラー部材を回転
させる駆動部材を設ける。Means and Action for Solving the Problems To this end, in the present invention, a valve operating cam member is rotatably fitted to a cam shaft that is rotationally driven in synchronization with a crankshaft, and the cam shaft and the valve operating cam member are fitted. An eccentric member eccentric to the camshaft is interposed between the eccentric member and the camshaft and the valve operating cam member are connected to the eccentric member by a radial groove and an engaging projection engaged with the groove. A valve opening / closing device for a four-stroke engine, wherein the valve opening / closing device is connected via a mechanism to periodically change the rotation phase of the valve operating cam member with respect to the camshaft by the eccentricity of the eccentric member so that the valve opening / closing timing can be adjusted. A receiving portion having an inner peripheral surface concentric with the cam shaft is provided on an outer peripheral surface of an end surface of a cam holder that rotatably supports an end portion of the valve operating cam member and supports the cam shaft via the valve operating cam member. Protruding, said inner circumference A collar member having an outer peripheral surface having the same diameter as the surface and having an inner hole eccentric to the outer peripheral surface is rotatably fitted to the inner peripheral surface of the receiving portion, and the inner hole of the collar member is An annular eccentric plate that surrounds the camshaft with a gap between the camshaft and the outer peripheral surface is rotatably fitted, and the eccentric plate is connected to the camshaft and the valve operating cam via the connecting mechanism, respectively. And a driving member for rotating the collar member.
本発明の弁開閉装置はこのように構成されているの
で、カム軸の回転が係合突起および溝を介して偏心板に
伝えられ、偏心板がカム軸の軸心に対して偏心した軸心
を中心として回転し、この偏心板の回転がさらに同様な
溝および係合突起を介して動弁カム部材に伝えられて、
動弁カム部材がカム軸の軸心を中心として回転する。こ
の結果、動弁カム部材のカム軸まわりの回転角速度が周
期的に変化して、カム軸より早い位相で回転する進相期
と遅い位相で回転する遅相期とが生じる。しかしてこの
進、遅相期のピストン行程に対する関係は偏心板のカム
軸に対する偏心方向によって変わるので、この偏心方向
を調節して、カムをカム軸に対して適当に進めたり遅ら
せたりすることにより、弁開閉時期を所望通り調整する
ことができる。Since the valve opening / closing device of the present invention is configured as described above, the rotation of the camshaft is transmitted to the eccentric plate via the engagement protrusion and the groove, and the eccentric plate is eccentric to the axis of the camshaft. And the rotation of this eccentric plate is further transmitted to the valve operating cam member through a similar groove and engagement projection,
The valve operating cam member rotates about the axis of the cam shaft. As a result, the rotational angular velocity of the valve operating cam member around the cam shaft changes periodically, and a fast phase in which the camshaft rotates faster and a slow phase in which the camshaft rotates later. However, since the relationship of the eccentric plate with respect to the cam shaft changes depending on the eccentric direction of the eccentric plate with respect to the cam shaft, the eccentric direction is adjusted, and the cam is appropriately advanced or retarded with respect to the cam shaft. In addition, the valve opening / closing timing can be adjusted as desired.
前記偏心方向の調節はカラー部材を駆動部材により回
転させることにより行われ、偏心板はその外周面を全面
にわたってカラー部材の内孔により回転自在に支承さ
れ、該外周面が軸受面となっているので、軸受面積が大
きく、従って摩耗や焼付けを生じ難く耐久性が向上す
る。しかもカラー部材はカムホルダの受け部の内周面に
嵌着されて該カムホルダにより強固に保持されているの
で、設定された偏心状態が運転中に狂うことがない。ま
た、カラー部材がカムホルダにより固定され、他に特別
な固定部材を必要としないので、装置が小型、簡単化す
る。さらに、偏心状態の調節はカラー部材を回転させる
ことにより行われるので、微妙な調節が可能であるとと
もに、比較的小さな力で容易に調節を行うことができ
る。The adjustment of the eccentric direction is performed by rotating the collar member by a driving member, and the eccentric plate is rotatably supported on the entire outer peripheral surface by an inner hole of the collar member, and the outer peripheral surface is a bearing surface. Therefore, the bearing area is large, so that wear and seizure hardly occur and durability is improved. In addition, since the collar member is fitted on the inner peripheral surface of the receiving portion of the cam holder and is firmly held by the cam holder, the set eccentric state does not go wrong during operation. In addition, since the collar member is fixed by the cam holder and no special fixing member is required, the size and the size of the apparatus are simplified. Furthermore, since the adjustment of the eccentric state is performed by rotating the collar member, fine adjustment is possible, and the adjustment can be easily performed with a relatively small force.
実施例 以下、本発明を図示の実施例について説明する。EXAMPLES Hereinafter, the present invention will be described with reference to the illustrated examples.
第１図は本発明による４サイクルエンジンの弁開閉装
置をカム軸中心を通る断面で切断した平面図である。１
はシリンダヘッドで、上面に吸気系のカム軸２と排気系
のカム軸３とが互いに平行に配設されている。本実施例
のエンジンはダブルオーバヘッドカムの４気筒エンジン
で、各気筒の吸気弁を開閉するカム部材41、42、43、44
がカム軸２に回転自在に嵌着され、該カム軸２に沿って
配列されている。各カム部材４にはそれぞれ２つのカム
５が形成されている。カム軸３には各気筒の排気弁を開
閉するカム部材61、62、63、64が同様に装着されてい
る。カム軸２側とカム軸３側とは実質的に同じ構成を有
しているので、以下カム軸２側の構成について詳細に説
明する。FIG. 1 is a plan view of a valve opening / closing device for a four-stroke engine according to the present invention, cut along a section passing through the center of a camshaft. 1
Is a cylinder head, on the upper surface of which an intake camshaft 2 and an exhaust camshaft 3 are arranged in parallel with each other. Engine of this embodiment is a four-cylinder engine of double overhead cam, the cam member 4 1 for opening and closing the intake valves of each cylinder, 4 2, 4 3, 4 4
Are rotatably fitted to the camshaft 2 and are arranged along the camshaft 2. Each cam member 4 is formed with two cams 5. Cam members 6 and 62, 6 3, 6 4 the cam shaft 3 to open and close the exhaust valve of each cylinder is mounted similarly. Since the camshaft 2 side and the camshaft 3 side have substantially the same configuration, the configuration of the camshaft 2 side will be described in detail below.
カム軸２はその長手方向中央にカムギヤ７を備え、該
カムギヤ７と噛合うギヤ列を介してクランク軸により、
該クランク軸の半分の回転速度で回転駆動される。すな
わち前記ギヤ列は左右に配列された４個の気筒列の中央
に配設されており、このような配設は自動二輪車用４サ
イクルエンジンにおいて最も普通に採用されている。The camshaft 2 is provided with a cam gear 7 at the center in the longitudinal direction, and is driven by a crankshaft via a gear train meshing with the cam gear 7.
It is driven to rotate at half the rotation speed of the crankshaft. That is, the gear train is arranged at the center of four cylinder arrays arranged on the left and right, and such an arrangement is most commonly employed in a four-stroke engine for a motorcycle.
カムギヤ７の両側に隣接してそれぞれカム部材42およ
びカム部材43が配設されているが、先ずカム部材43につ
いて述べる。カム部材43のカムギヤ７側の端部はカムホ
ルダ８によって回転自在に支承されている。カムホルダ
８は第２図に示すように下半部8aと上半部8bの２つ割り
になっており、シリンダヘッド１に固定された下半部8a
上に上半部8bを重ねてボルト９で締結することにより、
カム部材43を抱持している。カムホルダ８はまたカム部
材43を介してカム軸２を支持している。カムホルダ８の
外周部にはカムギヤ７の方へ向かって突出した環状の受
け部10が形成されている。受け部10の内周面10aはカム
軸２と同心の円筒面に形成されている。Although each adjacent to both sides cam member 4 2 and the cam member 4 3 of the cam gear 7 is disposed, first described cam member 4 3. End of the cam gear 7 side of the cam member 4 3 is rotatably supported by a cam holder 8. The cam holder 8 is divided into a lower half 8a and an upper half 8b as shown in FIG. 2, and the lower half 8a fixed to the cylinder head 1 is formed.
By overlapping the upper half 8b on top and fastening with bolts 9,
We are embracing the cam member 4 3. Cam holder 8 also supports the cam shaft 2 through the cam member 4 3. An annular receiving portion 10 protruding toward the cam gear 7 is formed on an outer peripheral portion of the cam holder 8. The inner peripheral surface 10a of the receiving portion 10 is formed as a cylindrical surface concentric with the camshaft 2.
受け部10にはカラー部材11がその外周面を前記内周面
10aに接して回転自在に嵌合されている。カラー部材11
の外周面の一部はギヤ部12となっており、カムホルダ８
に枢支されたカラー駆動軸13の端部に固定されたカラー
駆動ギヤ14がこのギヤ部12に噛合っている。前記受け部
10はカラー駆動ギヤ14の位置で一部切欠かれ、ギヤ14と
ギヤ部12との噛合いを可能としている。カラー部材11に
はまた、半径方向外方へ突出し次いでカムギヤ７の外方
をカム部材42側へ延びる連結レバー15が設けられてい
る。このカラー部材11はその外周面に対して偏心した内
孔16を有している。A collar member 11 has an outer peripheral surface on the inner peripheral surface of the receiving portion 10.
It is rotatably fitted in contact with 10a. Color member 11
A portion of the outer peripheral surface of the cam holder 8 is a gear portion 12.
A color drive gear 14 fixed to an end of a color drive shaft 13 pivotally supported by the gear portion 12 meshes with the gear portion 12. The receiving part
10 is partially cut away at the position of the color drive gear 14 so that the gear 14 and the gear portion 12 can mesh with each other. The collar member 11 also connecting lever 15 to the outer radius projecting the outward then the cam gear 7 extending cam member 4 2 side. The collar member 11 has an inner hole 16 eccentric to the outer peripheral surface.
この内孔16にその直径に等しい外径を有する偏心板17
が回転自在に嵌着されている。偏心板17自体は真円形の
環状をなしているが、前記のように偏心した内孔16に嵌
着される結果カム軸２に対して偏心する。そしてカラー
部材11をカラー駆動ギヤ14により回転させることによ
り、カム軸２に対する偏心方向が変わる。第２図におい
てP1はカム軸２の回転中心、P2は偏心板17の回転中心を
示す。偏心板17がどの方向に偏心しても偏心板17とカム
軸２が干渉しないように、偏心板17の内周とカム軸２の
外周との間には充分な隙間18が確保されている。Eccentric plate 17 having an outer diameter equal to its diameter in this inner hole 16
Are rotatably fitted. The eccentric plate 17 itself has a true circular annular shape, but is eccentric with respect to the camshaft 2 as a result of being fitted into the eccentric inner hole 16 as described above. When the collar member 11 is rotated by the collar drive gear 14, the eccentric direction with respect to the camshaft 2 is changed. P 1 is the rotation center of the cam shaft 2 in FIG. 2, P 2 denotes the rotational center of the eccentric plate 17. A sufficient gap 18 is provided between the inner periphery of the eccentric plate 17 and the outer periphery of the camshaft 2 so that the eccentric plate 17 and the camshaft 2 do not interfere with each other even if the eccentric plate 17 is eccentric in any direction.
偏心板17には同一直径上相対向する位置にそれぞれ半
径方向の溝19、20が設けられており、溝19にカムギヤ７
と一体の係合突起21が、また溝20にカム部材43と一体の
係合突起22がそれぞれ嵌入係合している。係合突起21の
回転が溝19を介して偏心板17に伝えられ、偏心板17の回
転が溝20を介して係合突起22に伝えられるが、溝19、20
は偏心板17の回転中心P2を中心として回転し、係合突起
21、22はカム軸２の回転中心P1を中心として回転するの
で、溝19、20と係合突起21、22は相対的に偏心板17の半
径方向に摺動しながら回転する。The eccentric plate 17 is provided with radial grooves 19 and 20 at positions opposed to each other on the same diameter, and the cam gear 7 is provided in the groove 19.
When integral of the engagement projection 21, also cam member 4 3 integral with the engaging projection 22 in the groove 20 is engaged respectively fitted engagement. The rotation of the engaging projection 21 is transmitted to the eccentric plate 17 via the groove 19, and the rotation of the eccentric plate 17 is transmitted to the engaging projection 22 via the groove 20, but the grooves 19, 20
Rotates around the rotational center P 2 of the eccentric plate 17, the engaging protrusion
21 and 22 so rotates around the rotation center P 1 of the cam shaft 2, the grooves 19, 20 and the engaging projections 21 and 22 are rotated while sliding in the radial direction of the relatively eccentric plate 17.
第２図には偏心板17を最上方に偏心させた時の状態が
示されており、偏心板回転中心P2がカム軸回転中心P1の
真上に位置している。この状態はエンジンの高速回転に
適応させた状態である。なお本実施例においてはカム５
の頂部の角度位置と係合突起22の角度位置とが一致して
おり、第２図においてはカム５が水平状態となっている
が、この状態から偏心板17が係合突起21に押されて中心
P2のまわりに図において時計方向に回転して行くと、カ
ム５が図示してないロッカアームを押上げ、該ロッカア
ームにより吸気弁が開かれる。そして係合突起22が溝20
とともに第３図に示すように最上位置に達した所で吸気
弁の開度が最大になる。この時、係合突起21の中心を通
るカム軸３の直径Ｄと、係合突起22の中心を通る偏心板
17の直径ｄとは重なり合っている。この状態から係合突
起21がカム軸３とともにさらに回転して直径Ｄが図にD1
で示す位置まで回転した時、P2を回転中心とする直径ｄ
は図にd1で示す位置を占める。係合突起22は常に直径ｄ
上に在るので、カム５はカム軸２の回転より遅れた位相
で回転する。一方、第３図の状態に達する以前において
は、直径ＤがD2位置に在る時に直径ｄはd2位置に在り、
カム５の回転位相はカム軸２の回転位相より進んでい
る。従ってカム５は、これがカム軸２に固定されている
時よりも早い時期に吸気弁を開き、遅い時期に吸気弁を
閉じることとなる。これは前述したようにエンジンの高
速回転時に望ましい弁開閉時期である。The second FIG there is shown a state in which is decentered eccentric plate 17 in the uppermost, the eccentric plate rotation center P 2 is positioned just above the camshaft rotation center P 1. This state is a state adapted to high-speed rotation of the engine. In this embodiment, the cam 5
2 and the angular position of the engaging projection 22 coincides with each other. In FIG. 2, the cam 5 is in a horizontal state. From this state, the eccentric plate 17 is pressed by the engaging projection 21. Center
When in Figure around the P 2 continue to rotate clockwise, up pushing the rocker arm cam 5 is not shown, the intake valve is opened by the rocker arm. And the engaging projection 22 is the groove 20
At the same time, as shown in FIG. 3, the opening of the intake valve reaches its maximum when it reaches the uppermost position. At this time, the diameter D of the camshaft 3 passing through the center of the engagement projection 21 and the eccentric plate passing through the center of the engagement projection 22
17 overlaps with the diameter d. From this state, the engagement protrusion 21 further rotates together with the camshaft 3 so that the diameter D becomes D 1 in the figure.
When rotated to the position shown, the diameter of the rotation center P 2 d
It occupies the position indicated by d 1 in FIG. The engagement projection 22 always has a diameter d.
Since it is above, the cam 5 rotates with a phase delayed from the rotation of the camshaft 2. On the other hand, in the before reaching the state of FIG. 3, the diameter d when the diameter D is in the D 2 position is at the d 2 position,
The rotation phase of the cam 5 leads the rotation phase of the cam shaft 2. Therefore, the cam 5 opens the intake valve earlier than when the cam 5 is fixed to the camshaft 2, and closes the intake valve later. This is a desirable valve opening / closing timing at the time of high-speed rotation of the engine as described above.
エンジンの低速回転時にはカラー部材11を180°回転
させて偏心板17を第４図に示すように最下方に偏心させ
る。開弁時および閉弁時における直径Ｄとｄの関係は、
同図にそれぞれD2、d2およびD1、d1で示すようになるの
で、弁は遅く開き、早く閉じることとなり、低速回転時
に望まれる弁開閉時期が得られる。カラー部材11を第３
図と第４図の中間状態に設定すれば、中速回転に適した
弁開閉時期が得られる。When the engine is running at a low speed, the collar member 11 is rotated by 180 ° so that the eccentric plate 17 is eccentric to the lowest position as shown in FIG. The relationship between the diameter D and d at the time of opening and closing the valve is as follows:
In the drawing, D 2 and d 2 and D 1 and d 1 respectively indicate that the valve opens slowly and closes quickly, so that the desired valve opening / closing timing at the time of low-speed rotation can be obtained. Third color member 11
By setting the intermediate state between FIG. 4 and FIG. 4, a valve opening / closing timing suitable for medium-speed rotation can be obtained.
偏心板17の偏心方向を定めるカラー部材11の回転位置
は、ギヤ部12と噛み合いカラー駆動軸13に固定されたカ
ラー駆動ギヤ14によって調節されるが、カラー駆動軸13
は第１図に示すようにカム軸２の外方をカム軸２に平行
に右方へ延び、最右方のカム部材64を超えた他端部に制
御ギヤ23が固設されている。そしてこの制御ギヤ23に制
御駆動ギヤ24が係合しており、該制御駆動ギヤ24が後述
する制御装置により制御されて回動することにより、制
御ギヤ23、カラー駆動軸13、カラー駆動ギヤ14を介して
カラー部材11が回動してエンジン回転数に応じた回転位
置に設定される。The rotation position of the collar member 11 that determines the eccentric direction of the eccentric plate 17 is adjusted by a color drive gear 14 fixed to the collar drive shaft 13 by meshing with the gear portion 12.
Extending parallel to the right outward of the cam shaft 2 to the cam shaft 2, as shown in FIG. 1, the control gear 23 to the other end beyond the cam member 6 4 rightmost is fixed in . A control drive gear 24 is engaged with the control gear 23, and the control drive gear 24 is rotated by being controlled by a control device described later, whereby the control gear 23, the color drive shaft 13, and the color drive gear 14 are rotated. , The collar member 11 is rotated to set the rotation position in accordance with the engine speed.
カム部材43の他端も前記カムホルダ８と同様なカムホ
ルダ8aによって支承されており、このカムホルダ8aの受
け部10aに前記と同様なカラー部材11aおよび偏心板17a
を有する偏心機構が保持され、これによってカム軸２と
カム部材44とが連結されている。その構造および作用は
前述のものと全く同様であるので詳細な説明は省略す
る。ただ、カラー部材11aは連結レバー15を備えていな
い点において前記カラー部材11と相違し、また前記係合
突起21に相当する係合突起21aはカム軸２に螺着された
フランジ部材25に突設されている。カラー部材11aのギ
ヤ部12aに噛合うカラー駆動ギヤ14aは前記カラー駆動軸
13に固設されており、カラー部材11とカラー部材11aの
調節がカラー駆動軸13により同時に行われる。The other end of the cam member 4 3 have also been supported by the same cam holder 8a and the cam holder 8, the same color members 11a and the eccentric plate 17a to the receiving portion 10a of the cam holder 8a
Eccentric with is retained, which the cam shaft 2 and the cam member 4 4 are connected by. Since the structure and operation are exactly the same as those described above, detailed description will be omitted. However, the collar member 11a is different from the collar member 11 in that the collar member 11a does not include the connection lever 15, and the engagement protrusion 21a corresponding to the engagement protrusion 21 projects from the flange member 25 screwed to the cam shaft 2. Has been established. The color drive gear 14a meshing with the gear portion 12a of the collar member 11a is the color drive shaft.
The adjustment of the collar member 11 and the collar member 11a is performed simultaneously by the collar drive shaft 13.
カム部材42はその両端部を前記カムホルダ８と同様な
カムホルダ8b、8cによって回転自在に支承され、カムギ
ヤ７に隣接したカムホルダ8bの受け部10bにカラー部材1
1bと偏心板17bから成る同様な偏心機構が保持され、該
機構を通じてカム部材42がカム軸２に連結されている。
カラー部材11bから連結レバー26が半径方向外方に突出
しており、該連結レバー26の先端は前記カラー部材11の
連結レバー15の先端に設けられた２股部分に挟まれてい
る（第５図参照）。従ってカラー部材11bはカラー部材1
1とともに回転し、カラー部材11の調節と同時にカラー
部材11bの調節が行われる。カラー部材11bのギヤ部12b
は、カムホルダ8b、8cに枢支された連結軸27の右端に固
設された被駆動ギヤ28と噛合っている。Cam member 4 2 similar cam holder 8b opposite ends thereof with said cam holder 8 is rotatably supported by 8c, collar member 1 to the receiving portion 10b of the cam holder 8b adjacent to the cam gear 7
A similar eccentric mechanism comprising 1b and an eccentric plate 17b is held, and the cam member 42 is connected to the camshaft 2 through the mechanism.
A connecting lever 26 protrudes outward in the radial direction from the collar member 11b, and the tip of the connecting lever 26 is sandwiched between two forks provided at the tip of the connecting lever 15 of the collar member 11 (FIG. 5). reference). Therefore, the collar member 11b is
Rotating together with 1, the adjustment of the collar member 11b is performed simultaneously with the adjustment of the collar member 11. Gear part 12b of collar member 11b
Is engaged with a driven gear 28 fixed to the right end of a connecting shaft 27 pivotally supported by the cam holders 8b and 8c.
カム部材41は前記カム部材44に対する駆動連結機構11
a、17a、25と全く同様な機構を介してカム軸２に駆動的
に連結されており、そのカラー部材11cには前記連結軸2
7に固設された駆動ギヤ29が噛合い、カラー部材11bの回
転が被駆動ギヤ28、連結軸27および駆動ギヤ29を介して
カラー部材11cに伝えられる。The cam member 4 1 wherein the drive coupling relative to the cam member 4 4 mechanism 11
a, 17a, and 25 are drivingly connected to the camshaft 2 via a mechanism exactly the same as that of the connecting shaft 2a.
The drive gear 29 fixed to 7 meshes, and the rotation of the collar member 11b is transmitted to the collar member 11c via the driven gear 28, the connecting shaft 27 and the drive gear 29.
結局、制御駆動ギヤ24の回転によって４個のカラー部
材11、11a、11b、11cが同時に同量回転し、４個の気筒
に対する吸気弁開閉時期がエンジン回転数に応じていっ
せいに調整される。排気弁側のカム部材61、62、63、64
も上記吸気弁側のカム部材41、42、43、44と同様にして
制御され、制御駆動ギヤ24は前記制御ギヤ23と噛合うと
ともに排気弁側の同様な制御ギヤ30とも噛合っている
（第１図、第６図参照）。Eventually, the rotation of the control drive gear 24 causes the four collar members 11, 11a, 11b, 11c to rotate simultaneously by the same amount, and the opening and closing timing of the intake valves for the four cylinders is adjusted in accordance with the engine speed. Exhaust valve side cam member 6 1 , 6 2 , 6 3 , 6 4
The cam member 4 1, also the intake valve side 4 2, 4 3, 4 4 and is controlled in the same manner, the control drive gear 24 is the same control gear 30 both meshing of the exhaust valve side with meshes with the control gear 23 (See FIGS. 1 and 6).
制御駆動ギヤ24は例えば第７図にその概略を示したよ
うな制御装置により制御されて回転駆動される。31はエ
ンジン32の外部に設けられたステップモータで、該ステ
ップモータ31の出力軸33と制御駆動ギヤ24の入力軸34と
がタイミングベルト35により接続されている。ステップ
モータ31には電源36から、電子制御ユニット（ECU）37
により制御された電流が供給される。電子制御ユニット
37はエンジン回転センサ38からの信号によりエンジン回
転数を計測し、該回転数に応じてステップモータ31への
電流をオン、オフするとともにその方向を制御し、これ
によってステップモータ31が必要な時に必要な回転数だ
け正転または逆転して、タイミングベルト35を介して制
御駆動ギヤ24を所定角度回動させる。制御駆動ギヤ24の
回動に応じて弁開閉時期が調整されることは前述の通り
である。The control drive gear 24 is controlled and rotated by, for example, a control device as schematically shown in FIG. Reference numeral 31 denotes a step motor provided outside the engine 32. An output shaft 33 of the step motor 31 and an input shaft 34 of the control drive gear 24 are connected by a timing belt 35. A power source 36 supplies an electronic control unit (ECU) 37 to the step motor 31.
Provides a controlled current. Electronic control unit
37 measures the engine speed based on the signal from the engine speed sensor 38, turns on and off the current to the step motor 31 according to the speed and controls the direction thereof, so that when the step motor 31 is needed, The control drive gear 24 is rotated by a predetermined angle via the timing belt 35 by rotating forward or backward by the required number of rotations. As described above, the valve opening / closing timing is adjusted according to the rotation of the control drive gear 24.
本実施例においては、偏心板17がカラー部材11の内孔
16に回転自在に嵌装され、偏心板17の外周面が偏心板17
の回転に対する軸受面となっているので、軸受面積が大
きく、従って摩耗や焼付けを生じ難く耐久性が向上す
る。In the present embodiment, the eccentric plate 17 is an inner hole of the collar member 11.
16 and is rotatably fitted to the eccentric plate 17.
Because of the bearing surface against rotation, the bearing area is large, so that wear and seizure hardly occur and durability is improved.
しかも、カラー部材11自体はカムホルダ８の受け部10
の内周面によりその外周面のほぼ全体にわたって強固に
保持されており、かつ調節時以外はカラー駆動ギヤ14が
ストッパとして働いてカラー部材11の回転を確実に阻止
するので、運転中にカラー部材11が動いて偏心板17の偏
心状態が変化し弁開閉時期に狂いを生ずることがない。Moreover, the collar member 11 itself is used as the receiving portion 10 of the cam holder 8.
The outer peripheral surface of the collar member is firmly held over substantially the entire outer peripheral surface thereof, and the collar drive gear 14 functions as a stopper to prevent the rotation of the collar member 11 reliably during the operation other than during adjustment, so that the collar member during operation is As a result, the eccentric state of the eccentric plate 17 changes due to the movement of the eccentric plate 17 and the opening and closing timing of the valve does not change.
上記のようなカラー部材11の固定はカムホルダ８を利
用して行われ、カラー部材11を強固に固定するために他
に特別な固定部材を必要としないので、装置が小型、簡
単化するとともに、多連シリンダにおいては膨出部が連
結レバー15,26の一部のみに限られるため機関全体とし
てもコンパクトにできる。The fixing of the collar member 11 as described above is performed by using the cam holder 8, and no special fixing member is required for firmly fixing the collar member 11. Therefore, the apparatus can be downsized and simplified. In the multiple cylinder, since the bulging portion is limited to only a part of the connecting levers 15, 26, the whole engine can be made compact.
また、偏心板17の偏心状態の調節はギヤ部12とカラー
駆動ギヤ14との噛合いによりカラー部材11を回転させる
ことにより行われるので、微妙な調節が可能であるとと
もに、比較的小さな力で容易に調節を行うことができ
る。Further, since the adjustment of the eccentric state of the eccentric plate 17 is performed by rotating the collar member 11 by meshing between the gear portion 12 and the color driving gear 14, fine adjustment is possible and with a relatively small force. Adjustments can be made easily.
さらに４つの気筒の吸気弁、排気弁の開閉時期が唯１
個の制御駆動ギヤ24の回動により同時に行われるので、
弁開閉時期の調整が極めて容易である。In addition, the opening and closing timing of the intake and exhaust valves of the four cylinders is only one.
It is performed simultaneously by the rotation of the control drive gears 24,
Adjustment of the valve opening / closing timing is extremely easy.
発明の効果 本発明によれば、偏心板はその外周面を軸受面として
カラー部材に回転自在に支承されているので、軸受面積
が大きく、従って耐久性が向上する。しかも、カラー部
材はその外周面のほぼ全体にわたってカムホルダの受け
部により強固に保持されているので、運転中にカラー部
材が動いて偏心板の偏心状態が変化し、弁開閉時期に狂
いを生ずることがない。その上、カラー部材の固定はカ
ムホルダを利用して行われ、カラー部材を強固に固点す
るために他に特別な固定部材を必要としないので、装置
が小型、簡単化する。また、偏心板の偏心状態の調節は
カラー部材を回転させることにより行われるので、微妙
な調節が可能であるとともに、比較的小さな力で容易に
調節を行うことができる等、多くの優れた効果が得られ
る。Effect of the Invention According to the present invention, the eccentric plate is rotatably supported by the collar member with the outer peripheral surface as a bearing surface, so that the bearing area is large and the durability is improved. Furthermore, since the collar member is firmly held by the receiving portion of the cam holder over substantially the entire outer peripheral surface thereof, the collar member moves during operation, and the eccentric state of the eccentric plate changes, resulting in an irregular opening and closing timing of the valve. There is no. In addition, the fixing of the collar member is performed by using the cam holder, and no special fixing member is required for firmly fixing the collar member. Therefore, the apparatus is small and simple. In addition, since the adjustment of the eccentric state of the eccentric plate is performed by rotating the collar member, fine adjustment is possible, and the adjustment can be easily performed with a relatively small force. Is obtained.
第１図は本発明による４サイクルエンジンの弁開閉装置
をカム軸中心を通る断面で切断した平面図、第２図は第
１図のII−II線に沿う断面図、第３図および第４図はそ
れぞれエンジンの高速回転時および低速回転時における
カム軸とカムの回転位相関係を説明するための図面で、
第２図と同じ断面内における各部材の関係位置を示した
概略図、第５図は隣接するカラー部材を互いに連結する
連結レバーの外面図、第６図は第１図のVI−VI線に沿う
断面図、第７図は制御駆動ギヤの制御装置を示す略図で
ある。 １…シリンダヘッド、２…カム軸、３…カム軸、４…カ
ム部材、５…カム、６…カム部材、７…カムギヤ、８…
カムホルダ、９…ボルト、10…受け部、11…カラー部
材、12…ギヤ部、13…カラー駆動軸、14…カラー駆動ギ
ヤ、15…連結レバー、16…内孔、17…偏心板、18…隙
間、19…溝、20…溝、21…係合突起、22…係合突起、23
…制御ギヤ、24…制御駆動ギヤ、25…フランジ部材、26
…連結レバー、27…連結軸、28…被駆動ギヤ、29…駆動
ギヤ、30…制御ギヤ、31…ステップモータ、32…エンジ
ン、33…出力軸、34…入力軸、35…タイミングベルト、
36…電源、37…電子制御ユニット、38…エンジン回転セ
ンサ。FIG. 1 is a plan view of a valve opening / closing device for a four-stroke engine according to the present invention cut along a section passing through the center of a camshaft, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, FIG. The figure is a diagram for explaining the rotational phase relationship between the cam shaft and the cam at the time of high-speed rotation and low-speed rotation of the engine, respectively.
FIG. 5 is a schematic view showing a relative position of each member in the same cross section as FIG. 2, FIG. 5 is an external view of a connecting lever for connecting adjacent collar members to each other, and FIG. 6 is a view taken along line VI-VI in FIG. FIG. 7 is a schematic view showing a control device of the control drive gear. DESCRIPTION OF SYMBOLS 1 ... Cylinder head, 2 ... Cam shaft, 3 ... Cam shaft, 4 ... Cam member, 5 ... Cam, 6 ... Cam member, 7 ... Cam gear, 8 ...
Cam holder, 9 bolt, 10 receiving part, 11 collar member, 12 gear part, 13 collar drive shaft, 14 collar drive gear, 15 coupling lever, 16 inner bore, 17 eccentric plate, 18 Gap, 19 groove, 20 groove, 21 engagement protrusion, 22 engagement protrusion, 23
... Control gear, 24 ... Control drive gear, 25 ... Flange member, 26
... Connection lever, 27 ... Connection shaft, 28 ... Drive gear, 29 ... Drive gear, 30 ... Control gear, 31 ... Step motor, 32 ... Engine, 33 ... Output shaft, 34 ... Input shaft, 35 ... Timing belt,
36 ... power supply, 37 ... electronic control unit, 38 ... engine rotation sensor.
Claims (1)
軸に動弁カム部材を回転自在に嵌装し、該カム軸と動弁
カム部材との間にカム軸に対して偏心可能な偏心部材を
介在させ、前記カム軸および動弁カム部材をそれぞれ前
記偏心部材に半径方向の溝とこの溝に係合する係合突起
とから成る連結機構を介して連結し、前記偏心部材の偏
心により前記カム軸に対する前記動弁カム部材の回転位
相を周期的に変化させて弁開閉時期を調整し得るように
した４サイクルエンジンの弁開閉装置において、前記動
弁カム部材の端部を回転自在に支承するとともに該動弁
カム部材を介して前記カム軸を支持するカムホルダの端
面外周部に前記カム軸と同心の内周面を有する受け部を
突設し、前記内周面と同径の外周面を有し該外周面に対
して偏心した内孔を有するカラー部材を前記受け部の内
周面に回転自在に嵌装し、該カラー部材の前記内孔に、
前記カム軸をその外周面との間に隙間を介して包囲する
円環状の偏心板を回転自在に嵌着し、該偏心板を前記カ
ム軸および動弁カム部材にそれぞれ前記連結機構を介し
て連結し、かつ前記カラー部材を回転させる駆動部材を
設けたことを特徴とする４サイクルエンジンの弁開閉機
構。1. A valve cam member is rotatably fitted on a cam shaft which is driven to rotate in synchronization with a crankshaft, and is eccentric with respect to the cam shaft between the camshaft and the valve cam member. An eccentric member is interposed, and the camshaft and the valve operating cam member are respectively connected to the eccentric member via a coupling mechanism including a radial groove and an engaging projection that engages with the groove. In the valve opening / closing device for a four-stroke engine in which the valve opening / closing timing can be adjusted by periodically changing the rotational phase of the valve operating cam member with respect to the camshaft, the end of the valve operating cam member is rotatable. A receiving portion having an inner peripheral surface concentric with the cam shaft is projected from an outer peripheral portion of an end surface of a cam holder that supports the cam shaft through the valve operating cam member and has the same diameter as the inner peripheral surface. An inner hole having an outer peripheral surface and eccentric to the outer peripheral surface The collar member having fitted rotatably to the inner peripheral surface of the receiving portion, in said hole of said collar member,
An annular eccentric plate that surrounds the camshaft with an outer peripheral surface of the camshaft with a gap therebetween is rotatably fitted, and the eccentric plate is attached to the camshaft and the valve operating cam member via the coupling mechanism, respectively. A valve opening / closing mechanism for a four-stroke engine, wherein a driving member for connecting and rotating the collar member is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30645989A JP2761949B2 (en) | 1989-11-28 | 1989-11-28 | Valve opening / closing device for 4-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30645989A JP2761949B2 (en) | 1989-11-28 | 1989-11-28 | Valve opening / closing device for 4-cycle engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03168309A JPH03168309A (en) | 1991-07-22 |
| JP2761949B2 true JP2761949B2 (en) | 1998-06-04 |
Family
ID=17957263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30645989A Expired - Fee Related JP2761949B2 (en) | 1989-11-28 | 1989-11-28 | Valve opening / closing device for 4-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2761949B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5778840A (en) * | 1995-05-25 | 1998-07-14 | Mitsubishi Jidosha Kogyo K.K. | Variable valve driving mechanism |
| JP3394390B2 (en) * | 1995-10-18 | 2003-04-07 | 株式会社日立ユニシアオートモティブ | Intake and exhaust valve drive control device for internal combustion engine |
| JP3612379B2 (en) * | 1996-04-10 | 2005-01-19 | 三菱自動車工業株式会社 | Variable valve mechanism drive device and hydraulic actuator |
| JP3899576B2 (en) * | 1997-02-07 | 2007-03-28 | 三菱自動車工業株式会社 | Variable valve mechanism and internal combustion engine with variable valve mechanism |
| JP3834921B2 (en) * | 1997-04-02 | 2006-10-18 | 三菱自動車工業株式会社 | Variable valve mechanism |
-
1989
- 1989-11-28 JP JP30645989A patent/JP2761949B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03168309A (en) | 1991-07-22 |
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