JPS6032910A - Forcibly opening and closing device of valve of internal- combustion engine - Google Patents

Abstract

PURPOSE:To equalize the durabilities of flanges which function to transmit loads to a suction or exhaust valve to open and close it by making the area of the opening flange larger than that of the closing flange and equalize the pressures which are applied on the faces of said flanges. CONSTITUTION:A retainer 17 which transmits compulsively valve opening and closing forces to a suction or exhaust valve 13 consists of the primary flange 48 to which a force is transmitted to open the valve, the secondary flange 49 to which a force is transmitted to close it, and a cylindrical part 47. A U-shaped engagement part 36 of a rocker arm which transmits compusively opening and closing forces is inserted between both the flanges 48 and 49. The retainer 17 is so designed that the area of the primary flange 48 is made larger than that of the secondary flange 49 and pressures of the engagement part 36 of the rocker arm are applied equally on the areas of both the flanges. Consequently, the retainer may be reduced in weight and its flanges be kept in balance in their properties of durability.

Description

【発明の詳細な説明】 本発明は、回転駆動されるカム軸に一体化されたカムに
摺接して揺動すべく、前記カム軸と平行なロッカアーム
軸にロッカアームが枢支され、吸気バルブあるいは排気
バルブに螺着されたリテーナに前記ロッカアームが係合
される内燃機関のバルブ強制開閉装置に関する。DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a rocker arm is pivotally supported on a rocker arm shaft parallel to the camshaft in order to swing in sliding contact with a cam integrated with a rotationally driven camshaft. The present invention relates to a valve forced opening/closing device for an internal combustion engine in which the rocker arm is engaged with a retainer screwed onto an exhaust valve.

従来、かかるバルブ強制開閉装置において、ロッカアー
ムの揺動によるバルブの強制開閉駆動時のバルブリフト
と加速度との関係を示すと、第６図のようになる。すな
わち、第６図において、実線で示す曲線がリフトカーブ
であり、破線で示す曲線が加速度カーブであるが、リテ
ーナの下端には加速度カーブの＋側で荷重が作用し、リ
テーナの上端には加速度カーブの一側で荷重が作用する
。Conventionally, in such a forced valve opening/closing device, the relationship between the valve lift and acceleration when the rocker arm swings to drive the valve to open/close forcibly is shown in FIG. In other words, in Fig. 6, the curve shown by the solid line is the lift curve, and the curve shown by the broken line is the acceleration curve, but the load acts on the lower end of the retainer on the + side of the acceleration curve, and the load acts on the upper end of the retainer on the + side of the acceleration curve. A load acts on one side of the curve.

したがってリテーナの下端には上端よりも大きな最大荷
重が作用する。このため、リテーナの下端の方の寿命が
短くなりがちである。また、バルブ強制開閉装置では、
閉弁時のシール性の確保およびバルブの微振動の防止の
ために、バルブを閉弁側に付勢するコイル状弁ばねが一
般的に用いられるが、そのコイルばねの一端はリテーナ
で支承されるので、リテーナは弁ばＡつを受けるために
適切な形状を有していることが望ましく、またバルブへ
の取付位置調整に際し、工具を容易に係合し得ることが
望ましい。Therefore, a larger maximum load acts on the lower end of the retainer than on the upper end. For this reason, the life of the lower end of the retainer tends to be shortened. In addition, in forced valve opening/closing devices,
A coiled valve spring is generally used to bias the valve toward closing in order to ensure sealing performance when the valve is closed and to prevent slight vibrations in the valve.One end of the coiled spring is supported by a retainer. Therefore, it is desirable that the retainer has an appropriate shape to receive the valve lug, and it is desirable that the retainer can be easily engaged with a tool when adjusting the attachment position to the valve.

本発明は、そのような事情に鑑みてなされたものであり
、上下両端の耐久性のバランスを保つようにし、しかも
弁ばねの一端を支承するに適切でありかつバルブへの取
付位置調整時の工具係合に適した形状のリテーナを備え
た内燃機関のバルブ強制開閉装置を提供することを目的
とする。The present invention has been made in view of such circumstances, and is designed to maintain a balance between the durability of both the upper and lower ends, to be suitable for supporting one end of the valve spring, and to be suitable for supporting one end of the valve spring, and for adjusting the mounting position to the valve. It is an object of the present invention to provide a forced valve opening/closing device for an internal combustion engine that includes a retainer having a shape suitable for engagement with a tool.

以下、図面により本発明を自動二輪車に適用したときの
実施例について説明すると、先ず第１図において、自動
二輪車の車体フレームＦには、たとえば４気筒の内燃機
関本体Ｅが搭載され、内燃機関本体Ｅの前部には各気筒
の排気ポートに連通して後方に延出する排気管１が接続
され、内燃機関本体Ｅの後部には、各気筒の吸気ボート
に４つの気化器２がそれぞれ個別に接続され、各気化器
２はエアクリーナ３に共通に接続される。このような自
動二輪車の内燃機関に、本発明に従うバルブ強制開閉装
置が設けられる。Hereinafter, an embodiment in which the present invention is applied to a motorcycle will be described with reference to the drawings. First, in FIG. 1, a 4-cylinder internal combustion engine main body E is mounted on a body frame F of a motorcycle. An exhaust pipe 1 that communicates with the exhaust port of each cylinder and extends rearward is connected to the front part of the internal combustion engine body E, and four carburetors 2 are individually connected to the intake boat of each cylinder at the rear part of the internal combustion engine main body E. , and each vaporizer 2 is commonly connected to an air cleaner 3. The internal combustion engine of such a motorcycle is provided with a forced valve opening/closing device according to the present invention.

第２図および第３図において、内燃機関本体Ｅの４つの
シリンダ４内にはピストン５が往復動自在に嵌入されて
おり、各シリンダ４のシリンダヘッド６には、一対の吸
気ボートγに個別に連通し相互に隣接する一対の吸気口
８と、一対の排気ポート９に個別に連通し相互に隣接す
る一対の排気口１０とが、燃焼室１１に向けて開口する
ように形成され、燃焼室１１の中央上部に点火プラグ１
２が取付けられる。2 and 3, pistons 5 are fitted into the four cylinders 4 of the internal combustion engine main body E so as to be able to freely reciprocate, and the cylinder head 6 of each cylinder 4 is provided with a pair of intake boats γ. A pair of intake ports 8 adjacent to each other and communicating with a pair of exhaust ports 9 and a pair of exhaust ports 10 adjacent to each other and connected to a pair of exhaust ports 9 are formed to open toward a combustion chamber 11. Spark plug 1 is placed in the upper center of chamber 11.
2 is installed.

各吸気口８には吸気バルブ１３がそれぞれ配設され、各
排気口１０には排気バルブ１４がそれぞれ配設される。Each intake port 8 is provided with an intake valve 13, and each exhaust port 10 is provided with an exhaust valve 14.

各吸気バルブ１３および排気バルブ１４は、シリンダヘ
ッド６を上下に貫通して設けられた案内筒１５．１６内
に移動自在に挿通されており、その上端に螺着されたリ
テーナ１７゜１８、ならびに案内筒ｉｓ、ｉｅの途中に
設けられた鍔部１９．２０との間には、各吸気バルブ１
３および排気バルブ１４を閉弁方向に付勢する弁ばね２
１，２２が介装される。Each intake valve 13 and exhaust valve 14 is movably inserted into a guide tube 15, 16 provided vertically through the cylinder head 6, and a retainer 17, 18 screwed onto the upper end of the guide tube 15, 16. Each intake valve 1 is provided between the guide tubes is, ie and the flanges 19 and 20 provided in the middle.
3 and a valve spring 2 that biases the exhaust valve 14 in the valve closing direction.
1 and 22 are interposed.

シリンダヘッド６の上部には、吸気バルブ１３用のバル
ブ強制開閉装置２３と、粘気バルブ１４用のバルブ強制
開閉装置２４とが設けられ、それらのバルブ強制開閉装
置２３．２４は、シリンダヘッド６の」１端を油密的に
覆うカバー２５．２６によって形成される一対の作動室
２・７，２８内に収容される。A forced valve opening/closing device 23 for the intake valve 13 and a forced valve opening/closing device 24 for the viscous valve 14 are provided in the upper part of the cylinder head 6. It is housed in a pair of working chambers 2, 7, 28 formed by a cover 25, 26 that oil-tightly covers one end of the .

一方のバルブ強制開閉装置２３は、一対の吸気バルブ１
３の配列方向に泪ってほぼ水平に延びてシリンダヘッド
６に支承され機関の回転に同期して％の回転比で回転駆
動されるカム軸２９と、該カム軸２９に一体化される開
き側カム３０と、開き側カム３０に隣接してカム軸２９
に一体化される閉じ側カム３１と、カム軸２９と平行な
軸線を有してシリンダヘッド６に固定されるロッカアー
ム軸３２と、ロッカアーム軸３２のまわりに揺動可能で
あり一対の吸気バルブ１３に連結されしかも開き側カム
３０に隣接する第１０ツカアーム３３と、ロッカアーム
３２のまわりに揺動可能であり閉じ側カム３１に摺接す
る第２０ツカアーム３４と、第２０ツカアーム３４に螺
着され第１ロツカアーム３３に当接する調整ねじ３５と
から成る。One of the forced valve opening/closing devices 23 connects the pair of intake valves 1
A camshaft 29 that extends substantially horizontally in the arrangement direction of No. 3, is supported by the cylinder head 6, and is rotationally driven at a rotation ratio of 100% in synchronization with the rotation of the engine, and an aperture integrated with the camshaft 29. The side cam 30 and the cam shaft 29 adjacent to the opening side cam 30
a closing-side cam 31 that is integrated into the cylinder head; a rocker arm shaft 32 that has an axis parallel to the cam shaft 29 and is fixed to the cylinder head 6; and a pair of intake valves 13 that are swingable around the rocker arm shaft 32. a tenth lug arm 33 connected to the opening side cam 30 and adjacent to the opening side cam 30; a twentieth lug arm 34 that is swingable around the rocker arm 32 and comes into sliding contact with the closing side cam 31; It consists of an adjustment screw 35 that comes into contact with the rocker arm 33.

ロッカアーム軸３２ば、カム軸２９よりも下方であって
カム軸２９の軸線を通る鉛直線に１男して吸気バルブ１
３の反対側に配設される。第１０ツカアーム３３は、ロ
ッカアーム軸３２に枢支される枢支部３３．ｚから吸気
バルブ１３側に向けて斜め上方に延出され、その先端に
は両吸気バルブ１３のリテーナ１７に係合される一対の
略Ｕ字状係止部３６，３γが設げられ、上部には開き側
カム３゜に摺接するカムスリッパ３８が設けられる。ま
た第１０ツカアーム３３には、その枢支部３３ａから吸
気バルブ１３と反対側に突出した受け部３９が一体的に
突設される。第２０ツカアーム３４は、ロッカアーム軸
３２に間接的に枢支される枢支部３４、ｚから、第１０
ツカアーム３３と１字状の角度をなすようにして上方忙
延出され、その先端部には閉じ側カム３１に摺接するカ
ムスリッパ４゜が設けられる。第２０ツカアーム３４に
は、第１０ツカアーム３３の受け部３９の上方に延出す
る支持部４１が突設されており、この支持部４１には上
下に延びるねじ孔４２が刻設される。ねじ孔４２には、
調整→っじ３５が進退可能に螺着されており、この調整
ねじ３５の先端が第１０ツカアーム３３の受け部３９に
当接する。第１および第２０ツカアーム３３．３４はシ
リンダヘソ）’６に設けられた規制段部４３，４４間で
ロッカアーム軸３２に支承され、一方の規制段部４４と
第２０ツカアーム３４との間にはコイルはね４５が介装
される。The rocker arm shaft 32 is located below the camshaft 29 and extends along a vertical line passing through the axis of the camshaft 29, and the intake valve 1
It is placed on the opposite side of 3. The tenth lever arm 33 has a pivot portion 33. which is pivotally supported on the rocker arm shaft 32. A pair of substantially U-shaped locking portions 36, 3γ are provided at the tips of the locking portions 36, 3γ, which extend diagonally upward from Z toward the intake valve 13 side, and are engaged with the retainers 17 of both intake valves 13. A cam slipper 38 is provided in sliding contact with the opening side cam 3°. Further, the tenth lug arm 33 is integrally provided with a receiving portion 39 that protrudes from the pivot portion 33a toward the side opposite to the intake valve 13. The 20th lever arm 34 is connected to the 10th pivot part 34, z which is indirectly pivotally supported on the rocker arm shaft 32.
A cam slipper 4° is provided at the distal end of the cam slipper 4, which is extended upward so as to make a 1-shaped angle with the claw arm 33, and slides into contact with the closing cam 31. The 20th claw arm 34 is provided with a protruding support portion 41 extending above the receiving portion 39 of the 10th claw arm 33, and this support portion 41 is provided with a screw hole 42 extending vertically. In the screw hole 42,
An adjustment screw 35 is screwed so that it can move forward and backward, and the tip of this adjustment screw 35 comes into contact with a receiving portion 39 of the tenth lug arm 33. The first and 20th lever arms 33 and 34 are supported on the rocker arm shaft 32 between regulating step portions 43 and 44 provided at the cylinder belly button 6, and between one regulating step portion 44 and the 20th lever arm 34 there is a coil. A spring 45 is interposed.

開き側カム３０は、円周方向−個所の高位部３０、と、
残余の低位部３０ｈとを有し、閉じ側カム３１は大部分
の中心角にわたる高位部３１ａと、残余の中心角にわた
る低位部３１／Ｉとを有し、吸気バルブ１３の開閉周期
に対応して両カム３０゜３１のイ目対位置が設定される
。The opening side cam 30 includes a high portion 30 in the circumferential direction, and
The closing side cam 31 has a remaining low portion 30h, a high portion 31a spanning most of the central angle, and a low portion 31/I spanning the remaining central angle, and corresponds to the opening/closing cycle of the intake valve 13. The positions of the two cams 30.degree. 31 are then set.

第４図および第５図において、リテーナ１７は、内面に
めねじ４Ｇが刻設された円筒部４７と、該円筒部４７の
下端に一体的に設けられる円形の第１ノランジ４８と、
円筒部４７の上端に設けられる第２フランジ４９とから
成る。第２フランジ４９は、第１フランジ４８の直径よ
りも小さな幅ｄ１で相互に平行に延びる一対の側面４９
　ｕ、　。In FIGS. 4 and 5, the retainer 17 includes a cylindrical portion 47 having a female thread 4G carved on its inner surface, a circular first norangement 48 integrally provided at the lower end of the cylindrical portion 47,
A second flange 49 is provided at the upper end of the cylindrical portion 47. The second flange 49 has a pair of side surfaces 49 that extend parallel to each other and have a width d1 smaller than the diameter of the first flange 48.
u, .

４９／Ｉを有する形状、たとえば六角形状に形成される
。また、吸気バルブ１３の上部には、おゎじ５０が刻設
されておＩフ、リテーナ１７は該おゎじ５０に前記め、
ｌＱじ４６を螺合して、吸気バルブ１３に固定される。49/I, for example, a hexagonal shape. Further, the upper part of the intake valve 13 is engraved with a groove 50, and the retainer 17 is attached to the groove 50.
It is fixed to the intake valve 13 by screwing the lQ screw 46 together.

この吸気バルブ１３への装着状態で、リテーナ１７の第
１フラ／ジ４８と案内筒１５の鍔部１９との間には、吸
気バルブ１３を囲繞するコイル状弁ばね２１が介装され
、この弁ばね２１は閉弁時のシール性確保および吸気バ
ルブ１３の微振動防止の機能を果す。When attached to the intake valve 13, a coiled valve spring 21 surrounding the intake valve 13 is interposed between the first flange 48 of the retainer 17 and the flange 19 of the guide tube 15. The valve spring 21 functions to ensure sealing performance when the valve is closed and to prevent slight vibrations of the intake valve 13.

一方、第１０ツカアーム３３の略Ｕ字状係止部３６．３
７は、その平示部両外側面間の幅ｄ２を前記第２フラン
ジ４９の両側面４９ｃｔ、４９ｈ間の幅ｄｌ　よりも大
きくして形成されており、その厚さｄ３は第１および第
２フランジ４８　、４’９間よりもわずかに小さく、す
なわち両フランジ４８゜４９間で円筒部４７に係合し得
るように設定される。On the other hand, the substantially U-shaped locking portion 36.3 of the tenth hook arm 33
7 is formed with a width d2 between both outer surfaces of the exposed portion larger than a width dl between both side surfaces 49ct and 49h of the second flange 49, and a thickness d3 of the second flange 49 It is set to be slightly smaller than between the flanges 48 and 4'9, that is, to be able to engage with the cylindrical portion 47 between the flanges 48 and 49.

排気バルブ１４用のバルブ強制開閉装置２４は、カム軸
５５と、開き側カム５６ど、閉じ側カム５７と、ロッカ
アーム軸５８と、第１０ツカアーム５９と、第２０ツカ
アーム６０と、調整ねじ６１と、リテーナ１８と、弁ば
ね２２となどを有して、上記バルブ強制開閉装置２３と
同様に構成される。The forced valve opening/closing device 24 for the exhaust valve 14 includes a cam shaft 55, an opening side cam 56, a closing side cam 57, a rocker arm shaft 58, a tenth lug arm 59, a twentieth lug arm 60, and an adjusting screw 61. , a retainer 18, a valve spring 22, etc., and is configured similarly to the forced valve opening/closing device 23 described above.

次にこの実施例の作用について説明するが、両バルブ強
制開閉装置２３．２４とも同様の動作をするので、吸気
バルブ１３用のバルブ強制開閉装置２３についてのみそ
の作用を説明すると、カム軸２９０回転動作によって閉
じ側カム３１の高位部３１αが第２０ツカアーム３４の
カムスリッパ４０に対応する位置に来ると、第２０ツカ
アーム３４はロッカアーム軸３２のまわりに第２図の時
計方向に回動し、調整ねじ３５を介して第１０ツカアー
ム３３を第２図の時開方向に押圧する。この際、第１０
ツカアーム３３のカムスリッパ３８に対応する位置には
開き側カム３０の低位部３０ｈが来ており、第１０ツカ
アーム３３の前記時開方向の回動は許容される。したが
−って、第１０ツカアーム３３はロッカアーム軸３２の
まわりに時開方向に回動して吸気バルブ１３を引き」二
げ、これにより吸気口８が閉じられる。Next, the operation of this embodiment will be explained. Since both the forced valve opening/closing devices 23 and 24 operate in the same way, the operation of only the forced valve opening/closing device 23 for the intake valve 13 will be explained. When the high part 31α of the closing side cam 31 comes to the position corresponding to the cam slipper 40 of the 20th latch arm 34 due to the operation, the 20th latch arm 34 rotates clockwise in FIG. 2 around the rocker arm shaft 32 and adjusts. The tenth hook arm 33 is pushed in the open direction shown in FIG. 2 via the screw 35. At this time, the 10th
The lower portion 30h of the opening side cam 30 is located at a position corresponding to the cam slipper 38 of the hook arm 33, and rotation of the tenth hook arm 33 in the above-mentioned opening direction is permitted. Therefore, the tenth lever arm 33 rotates around the rocker arm shaft 32 in the opening direction and pulls the intake valve 13, thereby closing the intake port 8.

次いで、開き側カム３０の高位部３０ａが第１０ツカア
ーム３３のカムスリッパ３８に摺接する位置に来ると、
第１０ツカアーム３３は押下げられて第２図の反時計方
向に回動じ、吸気バルブ１３を弁ばね２１のばね力に抗
して押下げて吸気口８を開く。この際、閉じ側カム３１
はその低位部３１５が第２０ツカアーム３４のカムスリ
ッパク４０に対応する位置に来ており、調整ねじ３５を
介して第２０ツカアーム３４に作用する反時計方向の押
圧力による第２０ツカアーム３４０回動が許容される。Next, when the high portion 30a of the opening side cam 30 comes to a position where it comes into sliding contact with the cam slipper 38 of the tenth latch arm 33,
The tenth lever arm 33 is pushed down and rotated counterclockwise in FIG. 2, pushing down the intake valve 13 against the spring force of the valve spring 21 to open the intake port 8. At this time, the closing side cam 31
The lower part 315 of the 20th claw arm 34 is at a position corresponding to the cam slipper 40 of the 20th claw arm 34, and the 20th claw arm 340 is allowed to rotate due to the counterclockwise pressing force acting on the 20th claw arm 34 via the adjustment screw 35. be done.

このようにして、第１および第２０ツカアーム３３．３
４の揺動運動により、吸気／くルブ１３が強制的に開閉
駆動されるが、第１０ツカアーム３３の揺動によりリテ
ーナ１７の第１フランジ４８には第２フランジ４９より
も大きな最大荷重が作用する。しかるに、第２フランジ
４９０幅ｄ１は第１フランジ４８の直径よりも小さく形
成されているので、第１および第２フランジ４８，４１
Ｃ作用する最大面圧を等しく設定することカー可能であ
り、両フランジ４８＼、４９の耐久性のバランスを保つ
ことができ、しかも吸気バルブ１３系の往復部重量を軽
減することができる。In this way, the first and twentieth lever arms 33.3
4, the intake valve 13 is forcibly driven to open and close. However, due to the swinging movement of the tenth lever arm 33, a maximum load that is larger than that on the second flange 49 is applied to the first flange 48 of the retainer 17. do. However, since the second flange 490 width d1 is formed smaller than the diameter of the first flange 48, the first and second flanges 48, 41
It is possible to set the maximum surface pressure acting equally, and it is possible to maintain a balance in the durability of both flanges 48 and 49, and also to reduce the weight of the reciprocating part of the intake valve 13 system.

次にリテーナ１７の吸気バルブ１３への取付位置を調整
するときを想定する。このときは、第４図および第５図
で二点鎖線で示ずよ５な工具５１を用℃・てリテーナ１
７を回転操作し、リテーナ１７を螺進あるいは螺退させ
て数句位置を調整する。Next, assume that the attachment position of the retainer 17 to the intake valve 13 is adjusted. At this time, use the tool 51 shown by the two-dot chain line in Figures 4 and 5 to remove the retainer 1.
7 and screw the retainer 17 forward or backward to adjust the position several times.

この際、リテーナ１７の第２フランジ４９は、少７１　
くとも一対の相互に平行な側面４　ｇ　ａ、　、　４９
　”を有する形状、たとえば六角形状に形成され−〔い
るので、リテーナ１７０回転繰作を行なうための工具５
１を係合するに適した形状であり、工具５１雄２フラン
ジ４９に係合して容易に回転操作することができる。し
かもこの際、第１０ツカアーノ、３３における両係止部
３６，３７の両列側面間の幅ｄ２は第２フランジ４９の
幅ｄ１よりも大きく設定されているので、工具５１０１
面は係止部３６゜３７の上面に当接することになり、リ
テーナ１７の位置調整時に工具５１がリテーナ１７から
外れたり、落込んでしまうことが極力防止され、作業性
を向上することが可能となる。At this time, the second flange 49 of the retainer 17
At least a pair of mutually parallel side surfaces 4 ga, , 49
”, for example, a hexagonal shape, so the tool 5 for rotating the retainer 170 is
1, and can be easily rotated by engaging with the male 2 flange 49 of the tool 51. Moreover, at this time, since the width d2 between the side surfaces of both rows of both locking portions 36 and 37 in the 10th Tucaano 33 is set larger than the width d1 of the second flange 49, the tool 5101
The surfaces come into contact with the upper surfaces of the locking portions 36 and 37, so that the tool 51 is prevented from coming off or falling from the retainer 17 when adjusting the position of the retainer 17, and it is possible to improve work efficiency. Become.

ヅ、上のように本発明によれば、リテーナはバルブの開
閉動作方向に延びる円筒部と、該円筒部の下端に一体的
に設けられる円形の第１フランジと、円筒部の」１端に
一体的に設けられ第１フランジの直径よりも小さな幅で
相互に平行に延びる少なくとも一対の側面を有する第２
フランジとを有して形成され、ロッカアームには円筒部
に係合する略Ｕ字状の係止部が設けられるので、比較的
大きな最大荷重が作用する第１フランジの最大面圧と、
比較的小さな最大荷重が作用する第２フランジの最大面
圧とを等しく設定することができ、その結果、第１およ
び第２フランジの耐久性のバランスを保つことができる
とともに、バルブ系の往復部重量を軽減することができ
る。また第１フランジは円形であるので弁ばねの一端を
支承するのに適した形状であり、第２フランジは少なく
とも一対の相互に平行な側面を有するので、リテーナを
回転操作してリテーナのバルブへの取付位置を調整する
ための工具を係合するのに適切な形状である。According to the present invention as described above, the retainer includes a cylindrical portion extending in the opening/closing direction of the valve, a circular first flange integrally provided at the lower end of the cylindrical portion, and a circular first flange provided at one end of the cylindrical portion. a second flange having at least a pair of side surfaces integrally provided and extending parallel to each other and having a width smaller than the diameter of the first flange;
flange, and the rocker arm is provided with a substantially U-shaped locking portion that engages with the cylindrical portion, so that the maximum surface pressure of the first flange, on which a relatively large maximum load acts,
The maximum surface pressure of the second flange on which a relatively small maximum load acts can be set equal, and as a result, the durability of the first and second flanges can be balanced, and the reciprocating part of the valve system can be set equal. Weight can be reduced. Further, since the first flange is circular, it has a shape suitable for supporting one end of the valve spring, and the second flange has at least a pair of mutually parallel side surfaces, so that the retainer can be rotated and attached to the valve of the retainer. The shape is suitable for engaging a tool to adjust the mounting position of the

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

第】図〜第５図は本発明の一実施例を示すもので、第１
図は本発明装置を適用する自動二輪車の側面図、第２図
は要部縦断面図、第３図は第２図のロＪ−１１１線から
見て一部を省略した平面図、第４図はリテーナの拡大縦
断面図、第５図は第４図の平面図、第６図はバルブリフ
トと加速度との関係を示すグラフである。 １３・・・吸気バルブ、１４・・・排気バルブ、１７゜
１８・・・リテーナ、２３．２４・・・バルブ強制開閉
装置、３０．５６・・・開き側カム、３１，５γ・閉じ
側カム、３３．５９・・・第１０ツカアーム、３４゜６
０・・第２０ツカアーム、３６．３７・・係止部、４７
・・・円筒部、４８・・・第１フランジ、４９・・・第
２フランジ、４９ｃｔ、４９ｂ・・側面 特許出願人　本田技研工業株式会社 第５図 第４図 第６図 埼燭 手続補正書（方刻 昭和５８年１２月−１１ １、事４件の表示 昭和５８年　特　願第１’４０８７９号２、発明の名称 内燃機関のバルブ強制開閉装置 ３、補正をする者 事件との関係　特許出願人 名　称　（５３２）本田技研工業株式会社４、代　理　
人　〒１０５ 住　所　東京都港区新橋四丁目４番５号　第に／ムラビ
ル５補正命令の日付Figures 1 to 5 show one embodiment of the present invention.
The figure is a side view of a motorcycle to which the device of the present invention is applied, FIG. 2 is a vertical cross-sectional view of main parts, FIG. 5 is a plan view of FIG. 4, and FIG. 6 is a graph showing the relationship between valve lift and acceleration. 13...Intake valve, 14...Exhaust valve, 17°18...Retainer, 23.24...Valve forced opening/closing device, 30.56...Opening side cam, 31,5γ/closing side cam , 33.59... 10th Tsuka Arm, 34°6
0...20th hook arm, 36.37...Locking part, 47
...Cylindrical portion, 48...First flange, 49...Second flange, 49ct, 49b...Side side Patent applicant Honda Motor Co., Ltd. Figure 5 Figure 4 Figure 6 Saitaku procedure amendment (December 1980-11 1. Indication of 4 cases 1988 Patent Application No. 1'40879 2. Title of invention: Forced valve opening/closing device for internal combustion engine 3. Relationship with the amended person's case. Patent Applicant name (532) Honda Motor Co., Ltd. 4, Agent
Person 105 Address 4-4-5 Shinbashi, Minato-ku, Tokyo Second/Date of Mura Building 5 Amendment Order

Claims (2)

【特許請求の範囲】[Claims] （１）　回転駆動されるカム軸に一体化されたカムに摺
接して揺動すべく、前記カム軸と平行なロッカアーム軸
に°ロッカアームが枢支され、吸気ノくルブあるいは排
気パルプに螺着されたリテーナに前記ロッカアームが係
合される内燃機関のノ＜ルブ強制開閉装置において、前
記リテーナは、前記吸気バルブあるいは排気パルプの開
閉動作方向に延びる円筒部と、該円筒部の下端に一体的
に設Ｕ゛られる円形の第１フランジと、円筒部の上端に
一体的に設けられ第１フランジの直径よりも小さな幅で
相互に平行に延びる少なくとも一対の側面を有する第２
フランジとを有して形成され、前記ロッカアームには前
記円筒部に係合する略Ｕ字状の係止部が設けられること
を特徴とする内燃機関のバルブ強制開閉装置。(1) A rocker arm is pivotally supported on a rocker arm shaft parallel to the camshaft in order to swing in sliding contact with a cam integrated with a rotationally driven camshaft, and is screwed onto an intake knob or exhaust pulp. In the forced valve opening/closing device for an internal combustion engine in which the rocker arm is engaged with the retainer, the retainer includes a cylindrical portion extending in the direction of opening/closing operation of the intake valve or exhaust pulp, and a lower end of the cylindrical portion. a circular first flange provided on the cylindrical portion; a second side surface integrally provided on the upper end of the cylindrical portion and having at least a pair of side surfaces extending parallel to each other with a width smaller than the diameter of the first flange;
1. A forced valve opening/closing device for an internal combustion engine, wherein the rocker arm is provided with a substantially U-shaped locking portion that engages with the cylindrical portion. （２）前記第２フランジの一対の側面間の幅は、前記ロ
ッカアームの係合部の相互に平行な一対の外側面間の幅
よりも小さく設定されることを特徴とする特許請求の範
囲第（１）項記載の内燃機関のバルブ強制開閉装置。(2) The width between the pair of side surfaces of the second flange is set smaller than the width between the pair of mutually parallel outer surfaces of the engaging portion of the rocker arm. A forced valve opening/closing device for an internal combustion engine according to item (1).