JPH0239607B2 - NAINENKIKANNODOBENSOCHI - Google Patents

NAINENKIKANNODOBENSOCHI

Info

Publication number
JPH0239607B2
JPH0239607B2 JP18525184A JP18525184A JPH0239607B2 JP H0239607 B2 JPH0239607 B2 JP H0239607B2 JP 18525184 A JP18525184 A JP 18525184A JP 18525184 A JP18525184 A JP 18525184A JP H0239607 B2 JPH0239607 B2 JP H0239607B2
Authority
JP
Japan
Prior art keywords
valve
oil
cam
plunger
changing mechanism
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 - Lifetime
Application number
JP18525184A
Other languages
Japanese (ja)
Other versions
JPS6181510A (en
Inventor
Yoshio Ajiki
Takayuki Hirayama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP18525184A priority Critical patent/JPH0239607B2/en
Publication of JPS6181510A publication Critical patent/JPS6181510A/en
Publication of JPH0239607B2 publication Critical patent/JPH0239607B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2411—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the valve stem and rocker arm
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Description

【発明の詳細な説明】 Ａ 発明の目的 (1) 産業上の利用分野 本発明は、閉弁方向に付勢された吸気弁あるい
は排気弁に対応した複数のカムフオロアを揺動駆
動すべく、機関の回転に同期して回転駆動される
カムシヤフトにはカムが一体化され、各カムフオ
ロアには、それらのカムフオロアを連結する状態
とその連結を解除する状態とを切換可能な弁作動
変更機構が設けられる内燃機関の動弁装置に関す
る。Detailed Description of the Invention A. Purpose of the Invention (1) Industrial Field of Application The present invention provides an engine for swinging a plurality of cam followers corresponding to an intake valve or an exhaust valve biased in the valve closing direction. A cam is integrated into a camshaft that is rotationally driven in synchronization with the rotation of the cam follower, and each cam follower is provided with a valve operation changing mechanism that can switch between connecting and disconnecting the cam followers. This invention relates to a valve train for an internal combustion engine.

(2) 従来の技術 かかる動弁装置は、本出願人により既に提案
（特願昭58−100505号）（特開昭59−226216号公
報）されているものであり、機関の低速運転時に
は弁作動変更機構によりカムフオロアとしてのロ
ツカアームの連結を解除して一部の吸気弁あるい
は排気弁のみを開閉作動させ、機関の高速運転時
には弁作動変更機構によりロツカアームを連結し
て全吸気弁あるいは全排気弁ともとに開閉作動さ
せるようにしており、ロツカアームの吸気弁ある
いは排気弁との当接部にはタペツトねじを進退自
在に螺合している。(2) Prior art This valve train has already been proposed by the applicant (Japanese Patent Application No. 1983-100505) (Japanese Patent Application Laid-Open No. 59-226216). The operation change mechanism releases the locker arm as a cam follower to open and close only some intake valves or exhaust valves, and when the engine is running at high speed, the valve operation change mechanism connects the locker arm to open or close all intake valves or all exhaust valves. It is designed to open and close at the same time, and a tappet screw is screwed into the part of the rocker arm that contacts the intake valve or exhaust valve so that it can move forward and backward.

(3) 発明が解決しようとする課題 上記従来の動弁装置では、吸気弁あるいは排気
弁が閉弁している状態では、両ロツカアームのタ
ペツトねじと、両吸気弁あるいは両排気弁との間
には間〓が生じる可能性があり、両ロツカアーム
の揺動作動に応じてタペツトねじが吸気弁あるい
は排気弁に当接する。このため、タペツトねじの
吸気弁あるいは排気弁への当接時の打撃音が生じ
るとともに、常時適確な作動を維持するために
は、タペツトねじの摩耗などに応じてタペツトね
じの螺合量調整を行う必要があつた。また、両ロ
ツカアームのピストンによる連結は、両ロツカア
ームが閉弁状態にあるときに行われるが、その閉
弁状態にあるときに各ロツカアームの位置が不安
定となり、弁作動変更機構の作動が円滑に行われ
なくなる可能性がある。(3) Problems to be Solved by the Invention In the conventional valve train described above, when the intake valve or exhaust valve is closed, there is a gap between the tappet screws of both rocker arms and both intake valves or both exhaust valves. There is a possibility that a gap may occur, and the tappet screw comes into contact with the intake valve or the exhaust valve in response to the rocking motion of both rocker arms. For this reason, a striking sound is generated when the tappet screw comes into contact with the intake valve or exhaust valve, and in order to maintain proper operation at all times, the threading amount of the tappet screw must be adjusted according to wear of the tappet screw. It was necessary to do this. In addition, the connection between both rocker arms by the piston is performed when both rocker arms are in the valve closed state, but when the valve is in the closed state, the position of each rocker arm becomes unstable, and the valve operation changing mechanism does not operate smoothly. There is a possibility that it will not be done.

本発明はかかる事情に鑑みてなされたものであ
り、カムフオロアを吸気弁あるいは排気弁に常時
弾発的に当接させることにより、調節操作を不要
として常に的確かつ静粛な動弁作動を実現し得る
ようにするとともに、弁作動変更機構の確実な連
結作動を可能とした内燃機関の動弁装置を提供す
ることを日的とする。 The present invention has been made in view of the above circumstances, and by bringing the cam follower into contact with the intake valve or the exhaust valve in a resilient manner at all times, accurate and quiet valve operation can be realized at all times without the need for adjustment operations. It is an object of the present invention to provide a valve operating system for an internal combustion engine that enables reliable connection operation of a valve operation changing mechanism.

Ｂ 発明の構成 (1) 課題を解決するための手段 本発明によれば、カムフオロアの吸気弁あるい
は排気弁との当接部には、吸気弁あるいは排気弁
に当接すべくばね付勢されながら当接部に摺動可
能に嵌合されるプランジヤと、該プランジヤの背
部に臨んで形成される油圧室と、給油源の常時連
通する油溜室と、前記油圧室および油溜室間に介
設されるチエツクバルブとを備えるオイルタペツ
トがそれぞれ設けられる。B. Structure of the Invention (1) Means for Solving the Problems According to the present invention, the portion of the cam follower that comes into contact with the intake valve or the exhaust valve is biased by a spring so as to come into contact with the intake valve or the exhaust valve. A plunger that is slidably fitted into the abutting portion, a hydraulic chamber formed facing the back of the plunger, an oil reservoir chamber that is in constant communication with an oil supply source, and an intervening space between the hydraulic chamber and the oil reservoir chamber. Each oil tappet is provided with a check valve provided therein.

(2) 作用 上記構成によれば、各カムフオロアは、それら
の当接部に設けられたオイルタペツトの働きによ
り、吸気弁あるいは排気弁に常時弾発的に当接
し、各カムフオロアはカムシヤフト側に付勢され
る。これにより、的確かつ静粛な動弁制御が達成
されるとともに、弁作動変更機構の確実な連結作
動が可能となる。(2) Effect According to the above configuration, each cam follower always resiliently contacts the intake valve or exhaust valve due to the action of the oil tappet provided at the contact portion thereof, and each cam follower is biased toward the camshaft side. be done. As a result, accurate and quiet valve control can be achieved, and the valve operation changing mechanism can be reliably connected.

(3) 実施例 以下、図面により本発明の一実施例について説
明すると、先ず第１図および第２図において、機
関本体１に設けられた一対の吸気弁Ｖ１，Ｖ２
は、機関の回転に同期して１／２の回転比で駆動
されるカムシヤフト２に一体的に設けられたカム
Ｃと、カムシヤフト２と平行な軸線まわりに揺動
自在なカムフオロアとしての第１および第２ロツ
カアーム３，４と、両ロツカアーム３，４に設け
られた弁作動変更機構５との働きにより、両吸気
弁Ｖ１，Ｖ２が開閉作動する状態と、一方の吸気
弁Ｖ１のみが開閉作動する状態とを切換えて、開
閉作動される。また機関本体１には、図示しない
一対の排気弁が備えられており、これらの排気弁
も前述の吸気弁Ｖ１，Ｖ２と同様に開閉作動され
る。(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, in FIGS. 1 and 2, a pair of intake valves V1 and V2 provided in the engine body 1 are shown.
The cam C is integrally provided with the camshaft 2 that is driven at a rotation ratio of 1/2 in synchronization with the rotation of the engine, and the first and second cams, which serve as cam followers that can freely swing around an axis parallel to the camshaft 2, are provided. Due to the functions of the second rocker arms 3 and 4 and the valve operation changing mechanism 5 provided on both rocker arms 3 and 4, both intake valves V1 and V2 are opened and closed, and only one intake valve V1 is opened and closed. It is opened and closed by switching the state. The engine body 1 is also equipped with a pair of exhaust valves (not shown), and these exhaust valves are also opened and closed in the same manner as the intake valves V1 and V2 described above.

カムシヤフト２は機関本体１の上方で回転自在
に配設されており、カムＣは一方の吸気弁Ｖ１に
対応する位置でカムシヤフト２に一体的に設けら
れる。また他方の吸気弁Ｖ２に対応する位置でカ
ムシヤフト２には同心円状の***部６が一体的に
設けられており、この***部６の半径はカムＣに
おけるベース円７の半径と同一に設定される。さ
らに第１ロツカアーム３の中央上部にはカムＣに
摺接するカムスリツパ８が一体的に設けられ、第
２ロツカアーム４の中央上部には***部６に摺接
し得るスリツパ９が一体的に設けられる。 The camshaft 2 is rotatably disposed above the engine body 1, and the cam C is integrally provided on the camshaft 2 at a position corresponding to one intake valve V1. Further, a concentric raised portion 6 is integrally provided on the camshaft 2 at a position corresponding to the other intake valve V2, and the radius of this raised portion 6 is set to be the same as the radius of the base circle 7 of the cam C. Ru. Further, a cam slipper 8 that slides on the cam C is integrally provided on the upper center of the first rocker arm 3, and a slipper 9 that can slide on the raised portion 6 is integrally provided on the upper center of the second rocker arm 4.

各ロツカアーム３，４の基部は、カムシヤフト
２と平行に機関本体１に固定されたロツカシヤフ
ト１０に相互に摺接して揺動自在に枢支される。 The bases of each of the rocker arms 3 and 4 are pivotally supported in sliding contact with a rocker shaft 10 that is fixed to the engine body 1 in parallel with the camshaft 2 so as to be freely swingable.

各ロツカアーム３，４の端部には吸気弁Ｖ１，
Ｖ２の上端に当接するための当接部１１，１２が
それぞれ設けられており、それらの当接部１１，
１２にはオイルタペツトＴ１，Ｔ２がそれぞれ設
けられる。これらのオイルタペツトＴ１，Ｔ２は
基本的に同一の構造を有しており、以下、一方の
オイルタペツトＴ２についてのみ、その構造を詳
述する。 At the end of each rocker arm 3, 4 there is an intake valve V1,
Contact portions 11 and 12 are provided for contacting the upper end of V2, respectively, and these contact portions 11,
12 are provided with oil tappets T1 and T2, respectively. These oil tappets T1 and T2 basically have the same structure, and the structure of only one oil tappet T2 will be described in detail below.

オイルタペツトＴ２は、吸気弁Ｖ２に当接する
方向にばね１３で付勢されて当接部１２に摺動可
能に嵌合されるプランジヤ１４と、該プランジヤ
１４の背部に臨んで形成される油圧室１５と、図
示しない給油源に常時連通する油溜室１６と、前
記油圧室１５および油溜室１６間に介設されるチ
エツクバルブ１７とを備える。 The oil tappet T2 includes a plunger 14 which is biased by a spring 13 in a direction of contacting the intake valve V2 and is slidably fitted into the contact portion 12, and a hydraulic chamber 15 formed facing the back of the plunger 14. , an oil reservoir chamber 16 constantly communicating with an oil supply source (not shown), and a check valve 17 interposed between the hydraulic chamber 15 and the oil reservoir chamber 16.

当接部１２には、吸気弁Ｖ２側に開放した有底
穴１８が穿設されており、この有底穴１８には、
閉塞端に球状頭部１９を備える有底円筒状プラン
ジヤ１４がその球状頭部１９を吸気弁Ｖ２側にし
て摺合される。有底穴１８の開放端内面にはリン
グ２０が嵌着されており、プランジヤ１４の有底
穴１８からの脱落は前記リング２０によつて阻止
される。 A bottomed hole 18 that is open to the intake valve V2 side is bored in the contact portion 12.
A bottomed cylindrical plunger 14 having a spherical head 19 at the closed end is slid together with the spherical head 19 facing the intake valve V2. A ring 20 is fitted into the inner surface of the open end of the bottomed hole 18, and the ring 20 prevents the plunger 14 from falling out of the bottomed hole 18.

またプランジヤ１４内には、油溜室１６を画成
する円筒部材２１が摺合されており、この円筒部
材２１の一端とプランジヤ１４との間には、プラ
ンジヤ１４の背部に臨む油圧室１５が画成され
る。油圧室１５内には、ばね１３で円筒部材２１
に押付けられたバルブケージ２２が収容されてお
り、このバルブケージ２２内の球状チエツクバル
ブ１７が浮動状に収容される。また円筒部材２１
の一端には、油溜室１５に連通する弁孔２３が、
前記チエツクバルブ１７により油圧室１５との連
連状態を遮断されるようにして穿設される。 A cylindrical member 21 that defines an oil reservoir chamber 16 is slid into the plunger 14, and a hydraulic chamber 15 facing the back of the plunger 14 is defined between one end of the cylindrical member 21 and the plunger 14. will be accomplished. A cylindrical member 21 is inserted into the hydraulic chamber 15 by a spring 13.
A valve cage 22 is housed therein, and a spherical check valve 17 is housed in this valve cage 22 in a floating manner. Also, the cylindrical member 21
At one end, a valve hole 23 communicating with the oil reservoir chamber 15 is provided.
The check valve 17 is provided in such a way that communication with the hydraulic chamber 15 is cut off.

円筒部材２１の外面には油溜室１６に連通する
環状溝２４が設けられ、プランジヤ１４の外面に
は、円筒部材２１とプランジヤ１４との相対移動
に拘わらず、前記環状溝２４に連通する環状溝２
５が設けられる。また円筒部材２１の他端はばね
１３のばね力により、有底穴１８の閉塞端に当接
すべく付勢されているが、この円筒部材２１の他
端には油溜室１６に連通する透孔２６が穿設され
る。さらに、有底穴１８、プランジヤ１４および
円筒部材２１によつて環状室２７が画成され、第
２ロツカアーム４には、環状室２７内の加、減圧
によりプランジヤ１４の移動が阻害されることを
防止するために、環状室２７内を外部に開放する
開放孔２８が穿設される。 An annular groove 24 communicating with the oil reservoir chamber 16 is provided on the outer surface of the cylindrical member 21, and an annular groove 24 communicating with the annular groove 24 is provided on the outer surface of the plunger 14, regardless of relative movement between the cylindrical member 21 and the plunger 14. Groove 2
5 is provided. The other end of the cylindrical member 21 is biased by the spring force of the spring 13 so as to come into contact with the closed end of the bottomed hole 18 , and the other end of the cylindrical member 21 is connected to the oil reservoir chamber 16 . A through hole 26 is bored. Furthermore, an annular chamber 27 is defined by the bottomed hole 18, the plunger 14, and the cylindrical member 21, and the second rocker arm 4 is provided with a mechanism that prevents movement of the plunger 14 due to pressurization or depressurization in the annular chamber 27. In order to prevent this, an open hole 28 is provided to open the inside of the annular chamber 27 to the outside.

ロツカシヤフト１０内には、図示しない給油源
に連通する給油路２９が設けられており、ロツカ
シヤフト１０の側壁には該給油路２９に連通する
連通孔３０が穿設される。さらに第２ロツカアー
ム４には、第２ロツカアーム４の揺動状態に拘わ
らず、連通孔３０を介して給油路２９に連通する
油路３１が穿設される。この給油路２９は、プラ
ンジヤ１４の移動位置に拘わらず、プランジヤ１
４の環状溝２５に常時連通する。したがつてオイ
ルタペツトＴ２の油溜室１６は給油源に常時連通
している。 An oil supply passage 29 communicating with an oil supply source (not shown) is provided inside the rock shaft 10, and a communication hole 30 communicating with the oil supply passage 29 is bored in the side wall of the rock shaft 10. Further, the second rocker arm 4 is provided with an oil passage 31 that communicates with the oil supply passage 29 through the communication hole 30 regardless of the swinging state of the second rocker arm 4. This oil supply path 29 is connected to the plunger 1 regardless of the moving position of the plunger 14.
It is always in communication with the annular groove 25 of No. 4. The oil reservoir chamber 16 of the oil tappet T2 is therefore always in communication with the oil supply source.

油路３１の途中には絞り３２が設けられる。す
なわち、プランジヤ１４の環状溝２５に臨む部分
で油路３１には絞り３２が設けられ、この絞り３
２は給油源からの給油速度を制限する機能を果た
す。また、第２ロツカアーム４における当接部１
２の上部には、透孔２６に連通する絞り３３が穿
設されており、この絞り３３は油溜室１６からの
排油速度を制限する機能を果たす。これらの絞り
３２，３３の働きにより、油溜室１６内の油圧は
給油源からの供給油圧が弁作動変更機構５の作動
のために変化しても、急激に変化することはな
い。 A throttle 32 is provided in the middle of the oil passage 31. That is, a throttle 32 is provided in the oil passage 31 at a portion facing the annular groove 25 of the plunger 14, and this throttle 3
2 serves to limit the rate of refueling from the refueling source. In addition, the contact portion 1 in the second rocker arm 4
A throttle 33 communicating with the through hole 26 is bored in the upper part of the oil reservoir 2 , and this throttle 33 functions to limit the speed of draining oil from the oil reservoir chamber 16 . Due to the function of these throttles 32 and 33, the oil pressure in the oil reservoir chamber 16 does not change suddenly even if the oil pressure supplied from the oil supply source changes due to the operation of the valve operation changing mechanism 5.

一方、両吸気弁Ｖ１，Ｖ２の上部には鍔部３
４，３５が設けられており、これらの鍔部３４，
３５と機関本体１との間には、吸気弁Ｖ１，Ｖ２
を囲繞する弁ばねＳ１，Ｓ２が介装されており、
弁ばねＳ１，Ｓ２により各吸気弁Ｖ１，Ｖ２は閉
弁方向すなわち上方に向けて付勢されている。 On the other hand, the upper part of both intake valves V1 and V2 has a flange 3.
4, 35 are provided, and these collar parts 34,
Between 35 and the engine body 1 are intake valves V1 and V2.
Valve springs S1 and S2 surrounding the are interposed,
Each intake valve V1, V2 is biased toward the valve closing direction, that is, upward, by valve springs S1, S2.

第３図において、第１および第２ロツカアーム
３，４は、相互に摺接されており、それらの相対
角変位を可能とする状態と、両ロツカアーム３，
４を一体的に連結する状態とを切換可能な弁作動
変更機構５が両ロツカアーム３，４に設けられ
る。 In FIG. 3, the first and second rocker arms 3 and 4 are in sliding contact with each other, allowing their relative angular displacement;
Both rocker arms 3 and 4 are provided with a valve operation changing mechanism 5 that can switch between a state in which the two rocker arms 4 are integrally connected.

弁作動変更機構５は、両ロツカアーム３，４を
連結する位置と、その連結状態を解除する位置と
の間で、ロツカシヤフト１０と平行な軸線に沿つ
て移動可能なピストン５１と、そのピストン５１
の移動を規制するスリツパ５２と、ピストン５１
を連結解除位置側に移動させるべくストツパ５２
を付勢するばね５３とを備える。 The valve operation changing mechanism 5 includes a piston 51 that is movable along an axis parallel to the rocker shaft 10 between a position where both the rocker arms 3 and 4 are connected and a position where the joint state is released, and the piston 51.
a slipper 52 that restricts the movement of the piston 51;
The stopper 52 is used to move the
and a spring 53 that biases the.

第１ロツカアーム３には、第２ロツカアーム４
側に向けて開放するとともにロツカシヤフト１０
と平行な第１ガイド穴５４が穿設されており、こ
ろ第１ガイド穴５４の底部には段部５５を介して
小径部５６が設けられる。第１ガイド穴５４には
ピストン５１が摺合され、これりよりピストン５
１と第１ガイド穴５４の底面との間に油圧室５７
が画成される。また第１ロツカアーム３には油圧
室５７に連通する油路５８が穿設され、この油路
５８は、ロツカシヤフト１０の側壁に穿設された
透孔５９を介して、ロツカシヤフト１０内の給油
路２９に常時連通する。 The first locking arm 3 has a second locking arm 4.
Open to the side and lock shaft 10
A first guide hole 54 parallel to the roller is bored, and a small diameter portion 56 is provided at the bottom of the roller first guide hole 54 via a stepped portion 55 . The piston 51 is slid into the first guide hole 54, and the piston 51 is inserted into the first guide hole 54.
1 and the bottom surface of the first guide hole 54.
is defined. Further, an oil passage 58 communicating with the hydraulic chamber 57 is bored in the first rocker arm 3, and this oil passage 58 connects to the oil supply passage 29 in the rocker shaft 10 through a through hole 59 bored in the side wall of the rocker shaft 10. Communicate at all times.

ピストン５１の軸方向長さは、その一端が段部
５５に当接したときに、その他端が第１ロツカア
ーム３の第２ロツカアーム４側に臨む側面から突
出しないように設定される。 The axial length of the piston 51 is set so that when one end thereof contacts the stepped portion 55, the other end does not protrude from the side surface of the first rocker arm 3 facing the second rocker arm 4 side.

第２ロツカアーム４には、第１ロツカアーム３
の第１ガイド穴５４に対応して、第１ガイド穴５
４と同径の第２ガイド穴６０が第１ロツカアーム
３側に向けて開放して穿設され、この第２ガイド
穴６０に円板状のストツパ５２が摺合される。第
２ガイド穴６０の底部面には規制段部６１を介し
て小径部６２が設けられる。また第２ガイド穴６
０の底部と外側面との間にわたつて、第２ロツカ
アーム４には第２ガイド穴６０と同心でかつ小径
の挿通孔６３が穿設されており、ストツパ５２に
一体的かつ同心に設けられた小径の案内棒６４が
挿通孔６３に挿通される。さらに、スリツパ５２
と第２ガイド穴６０の底面との間には、案内棒６
４を囲繞するコイル状のばね５３が介装される。 The second locking arm 4 has the first locking arm 3.
The first guide hole 5 corresponds to the first guide hole 54 of
A second guide hole 60 having the same diameter as the first rocker arm 3 is opened and opened toward the first rocker arm 3 side, and a disc-shaped stopper 52 is slid into this second guide hole 60. A small diameter portion 62 is provided on the bottom surface of the second guide hole 60 via a regulating step portion 61 . Also, the second guide hole 6
A small-diameter insertion hole 63 that is concentric with the second guide hole 60 is bored in the second rocker arm 4 between the bottom and the outer surface of the stopper 52, and is provided integrally and concentrically with the stopper 52. A small diameter guide rod 64 is inserted into the insertion hole 63. Furthermore, slippers 52
A guide rod 6 is provided between the bottom surface of the second guide hole 60 and the bottom of the second guide hole 60.
A coiled spring 53 surrounding 4 is interposed.

このような弁作動変更機構５において、第１お
よび第２ガイド穴５４，６０は、第１ロツカアー
ム３のカムスリツパ８がカムＣのベース円７に摺
接し、かつ第２ロツカアーム４のスリツパ９が隆
起部６に摺接しているときに、同心となるように
定められている。 In such a valve operation changing mechanism 5, the first and second guide holes 54, 60 are such that the cam slipper 8 of the first rocker arm 3 slides on the base circle 7 of the cam C, and the slipper 9 of the second rocker arm 4 is raised. It is determined to be concentric when it is in sliding contact with part 6.

次にこの実施例の作用について説明すると、機
関の低速運転時には、弁作動変更機構５の油圧室
５７には比較的低圧の作動油が供給される。これ
により、ストツパ５２はばね５３によつて第１ロ
ツカアーム３側に押され、ピストン５１は段部５
５に当接する。この状態で、ピストン５１および
ストツパ５２の当接面は、第１および第２ロツカ
アーム３，４の摺接面に対応する位置になる。し
たがつて、第１および第２ロツカアーム３，４は
相互に摺接するとともに、ピストン５１およびス
トツパ５２を摺接させて相対角変位可能な状態に
ある。 Next, the operation of this embodiment will be explained. When the engine is operated at low speed, relatively low pressure hydraulic oil is supplied to the hydraulic chamber 57 of the valve operation changing mechanism 5. As a result, the stopper 52 is pushed toward the first rocker arm 3 by the spring 53, and the piston 51 is pushed toward the step portion 5.
5. In this state, the contact surfaces of the piston 51 and the stopper 52 are at positions corresponding to the sliding surfaces of the first and second rocker arms 3 and 4. Therefore, the first and second rocker arms 3 and 4 are in sliding contact with each other, and the piston 51 and the stopper 52 are in sliding contact so that they can be relatively angularly displaced.

このような弁作動変更機構５の連結解除状態に
おいて、カムシヤフト２の回転動作により、第１
ロツカアーム３はカムＣによつて揺動作動し、一
方の吸気弁Ｖ１がカムＣの形状に応じたタイミン
グおよびリフト量で開閉作動する。一方、第２ロ
ツカアーム４は、そのスリツパ９が***部６に摺
接した状態にあり、他方の吸気弁Ｖ２は閉弁した
ままである。 In such a disconnected state of the valve operation changing mechanism 5, the rotation of the camshaft 2 causes the first
The rocker arm 3 is oscillated by the cam C, and one intake valve V1 is opened and closed at a timing and lift amount depending on the shape of the cam C. On the other hand, the slipper 9 of the second rocker arm 4 is in sliding contact with the raised portion 6, and the other intake valve V2 remains closed.

機関の高速運転に際しては、弁作動変更機構５
の油圧室５７に比較的高圧の作動油が供給され
る。これによりピストン５１はストツパ５２が規
制段部６１に当接するまでばね５３を縮小しなが
ら第２ガイド穴６０内に移動し、ピストン５１に
より第１および第２ロツカアーム３，４が連結さ
れる。 When operating the engine at high speed, the valve operation changing mechanism 5
Relatively high pressure hydraulic oil is supplied to the hydraulic chamber 57 of. As a result, the piston 51 moves into the second guide hole 60 while compressing the spring 53 until the stopper 52 comes into contact with the restriction step 61, and the piston 51 connects the first and second rocker arms 3 and 4.

このように、第１および第２ロツカアーム３，
４が一体的に連結された状態では、カムＣの回転
に応じて第１および第２ロツカアーム３，４がと
もに揺動し、両吸気弁Ｖ１，Ｖ２がともに開閉作
動せしめられる。 In this way, the first and second rocker arms 3,
4 are integrally connected, both the first and second rocker arms 3 and 4 swing according to the rotation of the cam C, and both the intake valves V1 and V2 are opened and closed.

このような弁作動変更機構５の連結作動時にお
いて、両吸気弁Ｖ１，Ｖ２が閉弁状態にあるとき
には、オイルタペツトＴ１，Ｔ２の働きにより、
第１ロツカアーム３はカムスリツパ８がカムＣの
ベース円７に摺接する方向、また第２ロツカアー
ム４はスリツパ９が***部６に摺接する方向にそ
れぞれ付勢されている。したがつて第１および第
２ガイド穴５４，６０の軸線が一致しているの
で、ピストン５１の移動が円滑に行われ、弁作動
変更機構５の確実な連結作動が行われる。 When the valve operation changing mechanism 5 is connected, when both the intake valves V1 and V2 are in the closed state, the oil tappets T1 and T2 act as follows.
The first rocker arm 3 is biased in the direction in which the cam slipper 8 slides against the base circle 7 of the cam C, and the second rocker arm 4 is biased in the direction in which the slipper 9 slides in contact with the raised portion 6. Therefore, since the axes of the first and second guide holes 54 and 60 are aligned, the piston 51 moves smoothly and the valve operation changing mechanism 5 is reliably connected.

また、給油源からの給油圧が前述のように変化
しても、オイルタペツトＴ１，Ｔ２の油溜室１６
の油圧は絞り３２，３３の働きによつて急激に変
化することはない。これにより、オイルタペツト
Ｔ１，Ｔ２の異常作動が防止され、各吸気弁Ｖ
１，Ｖ２の異常挙動の誘発が防止される。 Furthermore, even if the oil supply pressure from the oil supply source changes as described above, the oil reservoir chambers 16 of the oil tappets T1 and T2
The oil pressure does not change suddenly due to the action of the throttles 32 and 33. As a result, abnormal operation of the oil tappets T1 and T2 is prevented, and each intake valve V
1. Induction of abnormal behavior of V2 is prevented.

さらに、各オイルタペツトＴ１，Ｔ２のプラン
ジヤ１４は吸気弁Ｖ１，Ｖ２に常時弾発的に当接
するので、動弁作動が確実かつ静粛となる。 Furthermore, since the plungers 14 of each oil tappet T1, T2 are always elastically abutted against the intake valves V1, V2, the valve operation is reliable and quiet.

以上の説明では、吸気弁Ｖ１，Ｖ２に関連する
部分についてのみ述べたが、一対の排気弁につい
ても吸気弁Ｖ１，Ｖ２と同様に作動されるもので
ある。 In the above explanation, only the portions related to the intake valves V1 and V2 have been described, but the pair of exhaust valves are also operated in the same manner as the intake valves V1 and V2.

Ｃ 発明の効果 以上のように本発明によれば、カムフオロアの
吸気弁あるいは排気弁との当接部には、吸気弁あ
るいは排気弁に当接すべくばね付勢されながら当
接部に摺動可能に嵌合されるプランジヤと、該プ
ランジヤの背部に臨んで形成される油圧室と、給
油源に常時連通する油溜室と、前記油圧室および
油溜室間に介装されるチエツクバルブとを備える
オイルタペツトがそれぞれ設けられるので、各カ
ムフオロアを吸気弁あるいは排気弁に常時弾発的
に当接させて的確かつ静粛な作動を実現すること
ができるとともに、弁作動変更機構の円滑な連結
作動を可能にすることができる。C. Effects of the Invention As described above, according to the present invention, the cam follower slides into the contact portion while being biased by a spring to contact the intake valve or the exhaust valve. A plunger that can be fitted into the plunger, a hydraulic chamber formed facing the back of the plunger, an oil reservoir chamber that is constantly in communication with an oil supply source, and a check valve interposed between the hydraulic chamber and the oil reservoir chamber. Since each cam follower is provided with an oil tappet equipped with a valve, it is possible to keep each cam follower in constant elastic contact with the intake valve or exhaust valve to achieve accurate and quiet operation, and also to ensure smooth connection operation of the valve operation changing mechanism. can be made possible.

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

図面は本発明の一実施例を示すもので、第１図
は平面図、第２図は第１図の−線拡大断面
図、第３図は第２図の−線に沿つて第１図と
同一縮尺で示した断面図である。 ２……カムシヤフト、３，４……カムフオロア
としてのロツカアーム、５……弁作動変更機構、
１１，１２……当接部、１４……プランジヤ、１
５……油圧室、１６……油溜室、１７……チエツ
クバルブ、３２，３３……絞り、５１……ピスト
ン、Ｃ……カム、Ｔ１，Ｔ２……オイルタペツ
ト、Ｖ１，Ｖ２……吸気弁。 The drawings show one embodiment of the present invention; FIG. 1 is a plan view, FIG. 2 is an enlarged sectional view taken along the line - in FIG. 1, and FIG. FIG. 2...Camshaft, 3, 4...Rocker arm as cam follower, 5...Valve operation changing mechanism,
11, 12... Contact portion, 14... Plunger, 1
5... Hydraulic chamber, 16... Oil reservoir chamber, 17... Check valve, 32, 33... Throttle, 51... Piston, C... Cam, T1, T2... Oil tappet, V1, V2... Intake valve .

Claims (1)

【特許請求の範囲】 １ 閉弁方向に付勢された吸気弁あるいは排気弁
に対応した複数のカムフオロアを揺動駆動すべ
く、機関の回転に同期して回転駆動されるカムシ
ヤフトにはカムが一体化され、各カムフオロアに
は、それらのカムフオロアを連結する状態とその
連結を解除する状態とを切換可能な弁作動変更機
構が設けられる内燃機関の動弁装置において、前
記カムフオロアの吸気弁あるいは排気弁との当接
部には、吸気弁あるいは排気弁に当接すべくばね
付勢されながら当接部に摺動可能に嵌合されるプ
ランジヤと、該プランジヤの背部に臨んで形成さ
れる油圧室と、給油源に常時連通する油溜室と、
前記油圧室および油溜室間に介設されるチエツク
バルブとを備えるオイルタペツトがそれぞれ設け
られることを特徴とする内燃機関の動弁装置。 ２ 前記弁作動変更機構は、油圧の作用により各
カムフオロアを連結する位置とその連結を解除す
る位置との間で移動可能なピストンを備え、給油
源および油溜室間には絞りが介装されることを特
徴とする特許請求の範囲第１項記載の内燃機関の
動弁装置。[Claims] 1. A cam is integrated into a camshaft that is rotationally driven in synchronization with the rotation of the engine in order to oscillately drive a plurality of cam followers corresponding to the intake valve or exhaust valve that is biased in the valve closing direction. In a valve train for an internal combustion engine, each cam follower is provided with a valve operation changing mechanism capable of switching between a state in which the cam followers are connected and a state in which the connection is released. The abutment part includes a plunger that is slidably fitted into the abutment part while being biased by a spring so as to come into contact with the intake valve or the exhaust valve, and a hydraulic chamber formed facing the back of the plunger. and an oil sump chamber that is constantly in communication with the oil supply source.
A valve operating system for an internal combustion engine, characterized in that an oil tappet having a check valve interposed between the hydraulic chamber and the oil reservoir chamber is provided. 2. The valve operation changing mechanism includes a piston that is movable between a position where each cam follower is connected and a position where the connection is released by the action of hydraulic pressure, and a throttle is interposed between the oil supply source and the oil reservoir chamber. A valve train for an internal combustion engine according to claim 1, characterized in that:
JP18525184A 1984-09-04 1984-09-04 NAINENKIKANNODOBENSOCHI Expired - Lifetime JPH0239607B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18525184A JPH0239607B2 (en) 1984-09-04 1984-09-04 NAINENKIKANNODOBENSOCHI

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18525184A JPH0239607B2 (en) 1984-09-04 1984-09-04 NAINENKIKANNODOBENSOCHI

Publications (2)

Publication Number Publication Date
JPS6181510A JPS6181510A (en) 1986-04-25
JPH0239607B2 true JPH0239607B2 (en) 1990-09-06

Family

ID=16167537

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18525184A Expired - Lifetime JPH0239607B2 (en) 1984-09-04 1984-09-04 NAINENKIKANNODOBENSOCHI

Country Status (1)

Country Link
JP (1) JPH0239607B2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1308977C (en) * 1986-08-27 1992-10-20 Tsuneo Konno Valve operating device for internal combustion engine
JPS63106308A (en) * 1986-10-23 1988-05-11 Honda Motor Co Ltd Valve action timing selector for internal combustion engine
US4905639A (en) * 1986-10-23 1990-03-06 Honda Giken Kogyo Kabushiki Kaisha Valve operating apparatus for an internal combustion engine
DE3782035T2 (en) * 1987-01-30 1993-02-18 Honda Motor Co Ltd VALVE DRIVE MECHANISM FOR INTERNAL COMBUSTION ENGINE.
JPS6419131A (en) * 1987-07-13 1989-01-23 Honda Motor Co Ltd Moving valve control device for internal combustion engine
JPH07116925B2 (en) * 1987-07-31 1995-12-18 本田技研工業株式会社 Valve drive for internal combustion engine
WO2021008734A1 (en) * 2019-07-18 2021-01-21 Eaton Intelligent Power Limited Hla arrangement using cold formed plunger & manufacturing simplifications

Also Published As

Publication number Publication date
JPS6181510A (en) 1986-04-25

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