JPS6329125Y2 - - Google Patents
Info
- Publication number
- JPS6329125Y2 JPS6329125Y2 JP1982095422U JP9542282U JPS6329125Y2 JP S6329125 Y2 JPS6329125 Y2 JP S6329125Y2 JP 1982095422 U JP1982095422 U JP 1982095422U JP 9542282 U JP9542282 U JP 9542282U JP S6329125 Y2 JPS6329125 Y2 JP S6329125Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- cam follower
- cam
- adjusting
- tip
- 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
Links
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000004904 shortening Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
Description
【考案の詳細な説明】
本考案は四サイクル内燃機関の動弁装置におけ
る弁間隙調整装置に関するものである。[Detailed Description of the Invention] The present invention relates to a valve gap adjustment device in a valve train for a four-stroke internal combustion engine.
一般に四サイクル内燃機関の開閉弁（吸気弁お
よび排気弁）の動弁装置は、該機関運転時にその
状態に応じて熱変形する。そこでその熱変形によ
つて開閉弁が閉じなくなるのを防ぐために該装置
の動弁カムと開閉弁とを連動する機構にガタ、す
なわち弁間隙を設けるようにしているが、前記弁
間隙が過大になると、機関運動時の騒音が増し、
また弁間隙が過小になると、機関運転中に開閉弁
の気密不良を招くので、前記弁間隙を調整するた
めの調整装置が設けられる。従来の前記調整装置
は第５図に示すように動弁カム０１２と開閉弁０
４とを連係するカムフオロアー０９の先端にアジ
ヤストスクリユー０１５を螺着し、このアジヤス
トスクリユー０１５の調整によつて弁間隙を調す
るようにしているが、このものでは動弁カム０１
２と開閉弁０４の頭部間の間隙を第５図に示す状
態よりさらに縮めようとすると、アジヤストスク
リユー０１５が動弁カム０１２と干渉してしまう
ので、その短縮調整に限界があり、また前記干渉
を避けるために動弁カム０１２と開閉弁０４の頭
部間の間隔を拡げると動弁装置全体が大きくな
り、その結果機関全体の大型化を招いて好ましく
ない。また前記カムフオロアー０９はできるだけ
短く、かつ軽量に形成して動弁装置のコンパクト
化と往復動質量の軽減を図ることが望ましいが、
このようにするとカムフオロアー０９の揺動支点
と開閉弁０４とが近づくことになり当然に動弁カ
ム１２と開閉弁０４の頭部とが接近し、前述のよ
うにアジヤストスクリユー０１５が動弁カム０１
２と干渉するようになる。 In general, a valve operating system for on-off valves (intake valves and exhaust valves) of a four-cycle internal combustion engine is thermally deformed depending on the state during operation of the engine. Therefore, in order to prevent the on-off valve from becoming unable to close due to thermal deformation, a play, that is, a valve gap, is provided in the mechanism that interlocks the valve drive cam and the on-off valve of the device, but if the valve gap is too large, As a result, the noise during engine movement increases,
Furthermore, if the valve gap becomes too small, the opening/closing valve may become airtight during engine operation, so an adjustment device is provided to adjust the valve gap. The conventional adjusting device has a valve operating cam 012 and an on-off valve 0 as shown in FIG.
An adjuster screw 015 is screwed onto the tip of the cam follower 09 that links the valve drive cam 01 with the valve drive cam 01.
2 and the head of the on-off valve 04 from the state shown in FIG. 5, the adjustment screw 015 will interfere with the valve drive cam 012, so there is a limit to the shortening adjustment. Furthermore, if the distance between the valve operating cam 012 and the head of the on-off valve 04 is increased in order to avoid the interference, the entire valve operating system will become larger, which is undesirable as it will lead to an increase in the overall size of the engine. Furthermore, it is desirable that the cam follower 09 be made as short and lightweight as possible to make the valve train more compact and reduce the reciprocating mass.
In this way, the swinging fulcrum of the cam follower 09 and the opening/closing valve 04 will come closer together, and the valve operating cam 12 and the head of the opening/closing valve 04 will naturally approach each other. Cam 01
It comes to interfere with 2.
そこで本考案は動弁カムと開閉弁間の距離を短
縮してもアジヤストスクリユーが動弁カムに干渉
することがなく自由な弁間隙の調整を行うことが
できて動弁装置の小型軽量化を図ることができる
ようにし、しかも上記弁間隙調整作業を簡単的確
に行うことができる、内燃機関の動弁装置におけ
る弁間隙調整装置を提供することを主な目的とす
る。 Therefore, the present invention has been developed so that even if the distance between the valve train cam and the on-off valve is shortened, the adjusting screw does not interfere with the valve train cam and the valve gap can be freely adjusted, making the valve train compact and lightweight. The main object of the present invention is to provide a valve gap adjustment device for a valve operating system for an internal combustion engine, which can be used in a valve operating system for an internal combustion engine, and which can easily and accurately perform the above valve gap adjustment work.
そして上記目的を達成するために本考案は、弁
ばねにより閉弁方向に付勢される開閉弁の上端に
揺動可能なカムフオロアーの先端を連接し、その
カムフオロアー上面のスリツパ面に動弁カムを接
触させ、前記動弁カムの回転と弁ばねの弾発力と
の協働により前記開閉弁を作動するようにした内
燃機関の動弁装置において、前記カムフオロアー
の先端には、そのカムフオロアーの揺動方向と略
直交する方向にアジヤストスクリユーを設け、こ
のアジヤストスクリユーによりカムフオロアーの
先端に偏心輪等のアジヤストピースを、前記開閉
弁の作動方向に位置調整できるように固定すると
共に、そのアジヤストピースの外周面を開閉弁の
頭部端面に当接し、さらに前記アジヤストピース
の外周面には、該アジヤストピースを前記位置調
整する際に工具を係合し得る係合溝を凹設したこ
とを特徴とする。 In order to achieve the above object, the present invention connects the tip of a swingable cam follower to the upper end of the on-off valve that is biased in the valve closing direction by a valve spring, and attaches a valve drive cam to the slipper surface on the upper surface of the cam follower. In the valve train for an internal combustion engine, the opening/closing valve is actuated by the cooperation between the rotation of the valve train cam and the elastic force of a valve spring, in which the tip of the cam follower is provided with a swinging force of the cam follower. An adjusting screw is provided in a direction substantially perpendicular to the direction, and this adjusting screw fixes an adjusting piece such as an eccentric to the tip of the cam follower so that its position can be adjusted in the operating direction of the on-off valve. The outer circumferential surface of the adjusting piece comes into contact with the head end surface of the opening/closing valve, and the outer circumferential surface of the adjusting piece has an engagement groove into which a tool can be engaged when adjusting the position of the adjusting piece. It is characterized by having been established.
以下、第１〜４図により本考案の一実施例につ
いて説明する。 An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.
機関本体Ｅのシリンダヘツド１には、燃焼室２
に通じる弁口３が開口されるとともにこの弁口３
を開閉する開閉弁４（吸気弁もしくは排気弁）が
ガイド５を介して上下に摺動自在に嵌挿される。 The cylinder head 1 of the engine body E has a combustion chamber 2.
When the valve port 3 leading to is opened, this valve port 3
An on-off valve 4 (intake valve or exhaust valve) that opens and closes is fitted via a guide 5 so as to be slidable up and down.
シリンダヘツド１上には、前記開閉弁４を開閉
するための動弁装置Ｖが設けられる。 A valve train V for opening and closing the on-off valve 4 is provided on the cylinder head 1.
シリンダヘツド１に形成される弁座面６と、開
閉弁４との間には弁ばね７，８が縮設され、これ
ら弁ばね７，８の弾発力は開閉弁４を閉弁方向に
偏倚させる。 Valve springs 7 and 8 are compressed between the valve seat surface 6 formed on the cylinder head 1 and the on-off valve 4, and the elastic force of these valve springs 7 and 8 moves the on-off valve 4 in the closing direction. bias.
開閉弁４の側方において、シリンダヘツド１に
はカムフオロアー９がピポツト軸１０をもつて上
下に揺動自在に支承される。カムフオロアー９の
上方には動弁カム１２が配設され、該カム１２の
カム面１２ａはカムフオロアー９の上面に形成し
たスリツパ１３に当接される。 On the side of the on-off valve 4, a cam follower 9 is supported by the cylinder head 1 with a pivot shaft 10 so as to be able to swing up and down. A valve operating cam 12 is disposed above the cam follower 9, and a cam surface 12a of the cam 12 is brought into contact with a slipper 13 formed on the upper surface of the cam follower 9.
カムフオロアー９の先端には後に詳述する弁間
隙調整装置Ａを介して開閉弁４に連接される。 The tip of the cam follower 9 is connected to the on-off valve 4 via a valve gap adjustment device A, which will be described in detail later.
次に前記弁間隙調整装置Ａの構造を説明する
と、カムフオロアー９は、その先端に横断面コ字
状のフオーク部９ａが形成され、このフオーク部
９ａにはアジヤストピース、すなわち偏心輪１４
が密に嵌合され、この偏心輪１４は、前記フオー
ク部９ａにカムフオロアー９の揺動方向と略直交
する方向に設けられるアジヤストスクリユー１５
によつて回転可能に支持される。そして偏心輪１
４の中心o1と、偏心輪１４の主軸の中心o2間に
は、偏心距離ｅが存在する。アジヤストスクリユ
ー１５の先端にはナツト１７が螺締され、これに
より偏心輪はカムフオロアー９の先端に固定され
る。偏心輪１４の外周面には前記開閉弁４の頭部
端面が当接される。アジヤストピースすなわち偏
心輪１４の外周には、数個の係合溝１６が形成さ
れ、前記アジヤストスクリユー１５を緩めたのち
この係合溝１６にドライバ等の工具を差し込むこ
とにより偏心輪１４を回動調整することができ、
この場合偏心輪１４はその中心o1を中心に偏心回
転することができ、その外周面と開閉弁４の上端
との接点位置を上下に調整する。 Next, to explain the structure of the valve gap adjusting device A, the cam follower 9 has a fork portion 9a having a U-shaped cross section at its tip, and this fork portion 9a has an adjuster piece, that is, an eccentric ring 14.
The eccentric wheel 14 has an adjusting screw 15 provided in the fork portion 9a in a direction substantially perpendicular to the swinging direction of the cam follower 9.
Rotatably supported by. and eccentric wheel 1
An eccentric distance e exists between the center o 1 of the eccentric ring 14 and the center o 2 of the main axis of the eccentric ring 14 . A nut 17 is screwed onto the tip of the adjusting screw 15, thereby fixing the eccentric wheel to the tip of the cam follower 9. The head end surface of the on-off valve 4 is brought into contact with the outer peripheral surface of the eccentric ring 14 . Several engagement grooves 16 are formed on the outer periphery of the adjustment piece, that is, the eccentric wheel 14. After loosening the adjustment screw 15, a tool such as a screwdriver is inserted into the engagement grooves 16. The rotation can be adjusted,
In this case, the eccentric wheel 14 can rotate eccentrically around its center o 1 to adjust the contact position between its outer peripheral surface and the upper end of the on-off valve 4 up and down.
而して機関の組立時には、弁間隙の調整は次の
ように行う。開閉弁４と偏心輪１４間に所望の弁
間隙に等しい厚さを有するシムを挟み、動弁カム
１２とカムフオロアー９のスリツパ１３間の隙間
が零になるように偏心輪１４を回動調整した後、
ナツト１７を締付けてこれを固定する。 When assembling the engine, the valve clearance is adjusted as follows. A shim having a thickness equal to the desired valve gap was sandwiched between the on-off valve 4 and the eccentric wheel 14, and the rotation of the eccentric wheel 14 was adjusted so that the gap between the valve drive cam 12 and the slipper 13 of the cam follower 9 became zero. rear,
Tighten the nut 17 to secure it.
また機関運転後の弁間隙調整はアジヤストスク
リユー１５を緩めた後ドライバ等の工具を係合溝
１６に係合して偏心輪１４を回動調整する。 Further, to adjust the valve gap after the engine is running, after loosening the adjusting screw 15, a tool such as a screwdriver is engaged with the engagement groove 16 to adjust the rotation of the eccentric wheel 14.
以上のように本考案によれば、カムフオロアー
の先端に、そのカムフオロアーの揺動方向と略直
交する方向にアジヤストスクリユーを設け、この
アジヤストスクリユーにより、カムフオロアーの
先端に偏心輪等のアジヤストピースを開閉弁の作
動方向に位置調整できるように固定し、アジヤス
トピースを開閉弁の頭部端面に当接したので、動
弁カムを開閉弁の直上付近に位置させることがで
き、動弁カムと開閉弁間の距離を短縮して動弁装
置全体のコンパクト化と軽量化とが可能となり、
その結果機関全体のコンパクト化、軽量化を図る
ことができ、さらに動弁装置の往復動質量が小さ
くなり機関の高速性能を向上させることができ
る。 As described above, according to the present invention, an adjusting screw is provided at the tip of the cam follower in a direction substantially perpendicular to the rocking direction of the cam follower, and this adjusting screw allows the adjusting screw such as an eccentric ring to be attached to the tip of the cam follower. The stop piece is fixed so that its position can be adjusted in the operating direction of the on-off valve, and the adjustment piece is in contact with the head end face of the on-off valve, so the valve drive cam can be positioned directly above the on-off valve, and the adjustment piece can be positioned directly above the on-off valve. By shortening the distance between the valve cam and the on-off valve, the entire valve train can be made more compact and lighter.
As a result, the entire engine can be made more compact and lightweight, and the reciprocating mass of the valve train can be reduced, making it possible to improve the high-speed performance of the engine.
さらに前記アジヤストピースの外周面には、該
アジヤストピースを前記位置調整する際に工具を
係合し得る係合溝を凹設したので、弁間隙の調整
を行うに際しては、アジヤストスクリユーを緩め
た状態で工具を前記係合溝に係合させてアジヤス
トピースにトルクを付与するだけで、アジヤスト
ピースを所望の調整位置まで簡単に回動させるこ
とができ、しかもその回動後は工具を前記係合溝
に係合させたままアジヤストスクリユーを締込む
だけで、アジヤストピースを該スクリユーに共回
りさせることなく強固に締付けることができて同
アジヤストピースを上記調整位置に確実に固定す
ることができ、従つて全体として弁間隙の調整を
頗る簡単且つ的確に行うことができる。しかも、
アジヤストピース外周面に凹設される前記係合溝
は、その外周面を流下しようとする潤滑油の一部
を一時的に保持する機能も発揮し得るから、特に
アジヤストピースと開閉弁頭部との当接部への潤
滑効果を高める上で有効であり、その上、前記係
合溝の特設によりそれだけアジヤストピースの重
量が軽減されるから、動弁系の慣性重量軽減に寄
与し得る。 Further, an engagement groove is formed on the outer circumferential surface of the adjuster piece so that a tool can be engaged when adjusting the position of the adjuster piece. By simply engaging the tool with the engagement groove in the loosened state and applying torque to the adjusting piece, the adjusting piece can be easily rotated to the desired adjustment position, and even after the rotation By simply tightening the adjusting screw while the tool is engaged in the engagement groove, the adjusting piece can be firmly tightened without having to rotate with the screw, and the adjusting piece can be moved to the above adjustment position. Therefore, the valve gap can be adjusted very easily and precisely as a whole. Moreover,
The engagement groove recessed in the outer circumferential surface of the adjusting piece can also function to temporarily hold a portion of the lubricating oil that is about to flow down the outer circumferential surface, so it is especially important for adjusting the adjusting piece and the opening/closing valve head. This is effective in increasing the lubrication effect on the abutting part, and in addition, the special provision of the engagement groove reduces the weight of the adjuster piece, which contributes to reducing the inertial weight of the valve train. obtain.
第１〜４図は本考案装置の一実施例を示すもの
で、第１図はその側面図、第２図はその平面図、
第３図は第２図−線縦断面図、第４図は第１
図−線横断面図、第５図は従来装置の側面図
である。
４…開閉弁、７，８…弁ばね、９…カムフオロ
アー、１２…動弁カム、１２ａ…カム面、１３…
スリツパ、１４…アジヤストピースとしての偏心
輪、１５…アジヤストスクリユー、１６…係合
溝。
Figures 1 to 4 show an embodiment of the device of the present invention, with Figure 1 being a side view thereof and Figure 2 being a plan view thereof.
Figure 3 is a longitudinal sectional view taken along the line shown in Figure 2, and Figure 4 is a vertical cross-sectional view taken along the line shown in Figure 1.
Figure 5 is a side view of the conventional device. 4... Opening/closing valve, 7, 8... Valve spring, 9... Cam follower, 12... Valve drive cam, 12a... Cam surface, 13...
Slipper, 14... Eccentric wheel as adjustment piece, 15... Adjustment screw, 16... Engagement groove.
Claims (1)
弁４の上端に揺動可能なカムフオロアー９の先端
を連接し、そのカムフオロアー９上面のスリツパ
面１３に動弁カム１２を接触させ、前記動弁カム
１２の回転と弁ばね７，８の弾発力との協働によ
り前記開閉弁４を作動するようにした内燃機関の
動弁装置において、前記カムフオロアー９の先端
には、そのカムフオロアー９の揺動方向と略直交
する方向にアジヤストスクリユー１５を設け、こ
のアジヤストスクリユー１５によりカムフオロア
ー９の先端に偏心輪１４等のアジヤストピース
を、前記開閉弁４の作動方向に位置調節できるよ
うに固定すると共に、そのアジヤストピースの外
周面を開閉弁４の頭部端面に当接し、さらに前記
アジヤストピースの外周面には、該アジヤストピ
ースを前記位置調節する際に工具を係合し得る係
合溝１６を凹設してなる、内燃機関の動弁装置に
おける弁間隙調整装置。 The tip of a swingable cam follower 9 is connected to the upper end of the on-off valve 4 which is urged in the valve closing direction by the valve springs 7 and 8, and the valve operating cam 12 is brought into contact with the slipper surface 13 on the upper surface of the cam follower 9. In a valve train for an internal combustion engine in which the on-off valve 4 is operated by the cooperation of the rotation of the valve train cam 12 and the elastic force of the valve springs 7 and 8, the cam follower 9 is attached at the tip of the cam follower 9. An adjusting screw 15 is provided in a direction substantially perpendicular to the swing direction of the cam follower 9, and the adjusting screw 15 adjusts the position of an adjusting piece such as an eccentric ring 14 at the tip of the cam follower 9 in the operating direction of the on-off valve 4. At the same time, the outer peripheral surface of the adjusting piece is in contact with the head end surface of the on-off valve 4, and a tool is attached to the outer peripheral surface of the adjusting piece when adjusting the position of the adjusting piece. A valve gap adjustment device in a valve train for an internal combustion engine, which is provided with an engaging groove 16 that can be engaged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9542282U JPS59507U (en) | 1982-06-25 | 1982-06-25 | Valve gap adjustment device for internal combustion engine valve train |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9542282U JPS59507U (en) | 1982-06-25 | 1982-06-25 | Valve gap adjustment device for internal combustion engine valve train |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59507U JPS59507U (en) | 1984-01-05 |
| JPS6329125Y2 true JPS6329125Y2 (en) | 1988-08-05 |
Family
ID=30227881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9542282U Granted JPS59507U (en) | 1982-06-25 | 1982-06-25 | Valve gap adjustment device for internal combustion engine valve train |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59507U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5370212A (en) * | 1976-12-02 | 1978-06-22 | Bayerische Motoren Werke Ag | Valve operation lever |
-
1982
- 1982-06-25 JP JP9542282U patent/JPS59507U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5370212A (en) * | 1976-12-02 | 1978-06-22 | Bayerische Motoren Werke Ag | Valve operation lever |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59507U (en) | 1984-01-05 |
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