JP2002227624A - Sohc type valve mechanism of internal combustion engine - Google Patents
Sohc type valve mechanism of internal combustion engineInfo
- Publication number
- JP2002227624A JP2002227624A JP2002000906A JP2002000906A JP2002227624A JP 2002227624 A JP2002227624 A JP 2002227624A JP 2002000906 A JP2002000906 A JP 2002000906A JP 2002000906 A JP2002000906 A JP 2002000906A JP 2002227624 A JP2002227624 A JP 2002227624A
- Authority
- JP
- Japan
- Prior art keywords
- intake valve
- intake
- valve
- exhaust
- interlocking
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/242—Arrangement of spark plugs or injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/20—SOHC [Single overhead camshaft]
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Valve Device For Special Equipments (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は，一対の吸気弁およ
び一対の排気弁に対して共通に単一のカムシャフトが配
設され，該カムシャフトと一対の吸気弁との間には，連
動および連動解除を切換可能な連動切換機構を有する複
数の吸気弁駆動部材が揺動可能に配設され，前記カムシ
ャフトと一対の排気弁との間には，各排気弁に個別に対
応する一対の排気弁駆動部材が揺動可能に配設される内
燃機関のＳＯＨＣ型動弁装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single camshaft disposed in common for a pair of intake valves and a pair of exhaust valves, and an interlock between the camshaft and the pair of intake valves. And a plurality of intake valve driving members having an interlocking switching mechanism capable of switching interlocking release are swingably disposed between the camshaft and the pair of exhaust valves. The present invention relates to a SOHC type valve train for an internal combustion engine in which an exhaust valve driving member is swingably disposed.
【０００２】[0002]
【従来の技術】従来，かかる動弁装置は，たとえば特開
平４−１４０５号公報等で既に知られている。2. Description of the Related Art Conventionally, such a valve train is already known, for example, from Japanese Patent Application Laid-Open No. 4-1405.
【０００３】[0003]
【発明が解決しようとする課題】ところで，上記従来の
ものでは，一対の吸気弁に一端がそれぞれ連動，連結さ
れる２つのロッカアームを含む３つの吸気弁側ロッカア
ームの他端がローラーを介してカムにそれぞれ摺接さ
れ，それにより摩擦損失の低減が図られているが，連動
切換機構は各吸気弁側ロッカアームの一端および揺動軸
線間に設けられており，一対の排気弁に個別に連動，連
結される一対の排気弁側ロッカアームが上記３つの吸気
弁側ロッカアームの両側に配設されているので，点火プ
ラグは，両排気弁側ロッカアーム間に配置せざるを得な
かった。しかるに，排気側に点火プラグを配置したので
は点火プラグの熱引き性を向上させることは困難であ
り，その結果，ノッキング発生を防止するためには最大
トルクを発生させる点火時期近傍に点火時期を設定する
ことができず，充分なトルクを得難いという問題があ
る。また，吸気側を内方側に配置した車載用Ｖ型内燃機
関に上記構造を適用したときには，点火プラグを脱着す
るためのスペースを内燃機関の周囲に確保し難いという
問題がある。By the way, in the above conventional apparatus, the other ends of three intake valve side rocker arms including two rocker arms, one end of which is interlocked and connected to each of a pair of intake valves, are connected to a cam via a roller. The sliding switching mechanism is provided between one end of each rocker arm on the intake valve side and the pivot axis, and is interlocked with a pair of exhaust valves individually. Since the pair of exhaust valve side rocker arms connected to each other are disposed on both sides of the three intake valve side rocker arms, the ignition plug has to be disposed between both exhaust valve side rocker arms. However, arranging the ignition plug on the exhaust side makes it difficult to improve the heat dissipation of the ignition plug. As a result, in order to prevent knocking, the ignition timing must be set near the ignition timing at which the maximum torque is generated. There is a problem that it cannot be set and it is difficult to obtain sufficient torque. Further, when the above structure is applied to a vehicle-mounted V-type internal combustion engine in which the intake side is disposed on the inner side, there is a problem that it is difficult to secure a space around the internal combustion engine for attaching and detaching a spark plug.
【０００４】本発明は，かかる事情に鑑みてなされたも
のであり，摩擦損失の低減を図った上で吸気弁側に点火
プラグ等の他の部品を配置し得るスペースを確保した内
燃機関のＳＯＨＣ型動弁装置を提供することを目的とす
る。The present invention has been made in view of the above circumstances, and has been made to reduce the frictional loss and secure a space in which other components such as a spark plug can be arranged on the intake valve side. An object of the present invention is to provide a mold valve gear.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に，請求項１記載の発明によれば，連動切換機構は，隣
接する吸気弁駆動部材を連動させる位置ならびにその連
動を解除する位置間で移動可能な切換ピンと，切換ピン
の移動を案内すべく吸気弁駆動部材に固設される円筒状
軸部材とを備え，前記円筒状軸部材には，カムシャフト
に設けられたカムに摺接する円筒状の回転体が回転自在
に支承され，連動切換機構は吸気弁駆動部材の揺動軸線
に関して吸気弁とは反対側に配置される。To achieve the above object, according to the first aspect of the present invention, the interlocking switching mechanism is provided between a position for interlocking the adjacent intake valve driving member and a position for releasing the interlocking. And a cylindrical shaft member fixed to the intake valve driving member to guide the movement of the switching pin, and the cylindrical shaft member comes into sliding contact with a cam provided on a cam shaft. A cylindrical rotating body is rotatably supported, and the interlocking switching mechanism is disposed on the opposite side of the swing axis of the intake valve driving member from the intake valve.
【０００６】また請求項２記載の発明によれば，上記請
求項１記載の発明の構成に加えて，点火プラグを挿入す
るためのプラグパイプが両吸気弁間でシリンダヘッドに
連設される。According to a second aspect of the invention, in addition to the configuration of the first aspect, a plug pipe for inserting a spark plug is connected to the cylinder head between the two intake valves.
【０００７】[0007]
【発明の実施の形態】本発明の実施の形態を，添付図面
に例示した本発明の実施例に基づいて以下に具体的に説
明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on embodiments of the present invention illustrated in the accompanying drawings.
【０００８】添付図面において，図１ないし図５は本発
明の一実施例を示すものであり，図１はＶ型内燃機関の
側面図，図２は図１の２−２線矢視拡大断面図，図３は
図２の３−３線断面図，図４は図２の４−４線断面図，
図５は図３の５−５線断面図である。1 to 5 show an embodiment of the present invention. FIG. 1 is a side view of a V-type internal combustion engine, and FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. FIG. 3 is a sectional view taken along line 3-3 of FIG. 2, FIG. 4 is a sectional view taken along line 4-4 of FIG.
FIG. 5 is a sectional view taken along line 5-5 of FIG.
【０００９】先ず図１において，このＶ型内燃機関は，
クランク軸６の軸線方向に並ぶ１あるいは複数のシリン
ダ７と，該シリンダ７に対して上方に開いた略Ｖ字形に
配置されてクランク軸６の軸線方向に並ぶ１あるいは複
数のシリンダ７とがシリンダブロック８に設けられ，該
シリンダブロック８に結合されるシリンダヘッド９，９
に，上記Ｖ字形の内方側で各シリンダ７…の吸気ポート
１０…が設けられるとともに上記Ｖ字形の外方側で各シ
リンダ７…の排気ポート１１…が設けられ，シリンダヘ
ッド９，９間に各吸気ポート１０…に接続される吸気マ
ニホールドＭが配置されて成るものである。Referring first to FIG. 1, this V-type internal combustion engine
One or a plurality of cylinders 7 arranged in the axial direction of the crankshaft 6 and one or a plurality of cylinders 7 arranged in a substantially V-shape opened upward with respect to the cylinder 7 and arranged in the axial direction of the crankshaft 6 Cylinder heads 9, 9 provided in the block 8 and connected to the cylinder block 8
Are provided with intake ports 10 of the respective cylinders 7 on the inner side of the V-shape and exhaust ports 11 of the respective cylinders 7 on the outer side of the V-shape. And intake manifolds M connected to the respective intake ports 10.
【００１０】図２ないし図４を併せて参照して，シリン
ダ７にはピストン１２が摺動可能に嵌合され，該ピスト
ン１２の上面およびシリンダヘッド９間に燃焼室１３が
形成される。シリンダヘッド９には，燃焼室１３の天井
面に開口するようにして一対の吸気弁口１４…ならびに
一対の排気弁口１５…が設けられており，両吸気弁口１
４…は吸気ポート１０に連通され，両排気弁口１５…は
排気ポート１１に連通される。Referring also to FIGS. 2 to 4, a piston 12 is slidably fitted to the cylinder 7, and a combustion chamber 13 is formed between the upper surface of the piston 12 and the cylinder head 9. The cylinder head 9 is provided with a pair of intake valve ports 14 and a pair of exhaust valve ports 15 so as to open to the ceiling surface of the combustion chamber 13.
Are connected to the intake port 10, and both exhaust valve ports 15 are connected to the exhaust port 11.
【００１１】両吸気弁口１４…を個別に開閉可能な一対
の吸気弁１６，１６は，シリンダヘッド９にそれぞれ設
けられたガイド筒１７…に摺動可能に嵌合され，各ガイ
ド筒１７…から上方に突出した吸気弁１６，１６の上端
部に設けられるリテーナ１８，１８とシリンダヘッド９
との間には各吸気弁１６，１６を囲繞する弁ばね１９，
１９が縮設され，それらの弁ばね１９，１９により吸気
弁１６，１６は吸気弁口１４…を閉じる方向に付勢され
る。また両排気弁口１５…を個別に開閉可能な一対の排
気弁２０，２０は，シリンダヘッド９にそれぞれ設けら
れたガイド筒２１…に摺動可能に嵌合され，各ガイド筒
２１…から上方に突出した排気弁２０，２０の上端部に
設けられるリテーナ２２，２２とシリンダヘッド９との
間には各排気弁２０，２０を囲繞する弁ばね２３，２３
が縮設され，それらの弁ばね２３，２３により排気弁２
０，２０は排気弁口１５…を閉じる方向に付勢される。A pair of intake valves 16, 16, which can open and close both intake valve ports 14 individually, are slidably fitted to guide cylinders 17, respectively, provided on the cylinder head 9. Retainers 18, 18 provided at the upper ends of intake valves 16, 16 projecting upward from
And a valve spring 19 surrounding each intake valve 16, 16.
19 are contracted, and the intake valves 16, 16 are biased by the valve springs 19, 19 in a direction to close the intake valve ports 14. A pair of exhaust valves 20, 20 capable of individually opening and closing the two exhaust valve ports 15, are slidably fitted to guide cylinders 21 provided on the cylinder head 9, respectively. Valve springs 23, 23 surrounding the exhaust valves 20, 20 are provided between the cylinder head 9 and retainers 22, 22 provided at the upper end portions of the exhaust valves 20, 20 projecting from the cylinder head 9.
Are reduced, and the exhaust valve 2 is
0, 20 are urged in a direction to close the exhaust valve ports 15.
【００１２】上記両吸気弁１６，１６と，クランク軸６
に１／２の減速比で連動，連結されるカムシャフト２６
との間には，カムシャフト２６の回転運動を吸気弁１
６，１６の開閉運動に変換する吸気弁駆動手段２７1 が
設けられ，両排気弁２０，２０と前記カムシャフト２６
との間には，カムシャフト２６の回転運動を排気弁２
０，２０の開閉運動に変換する排気弁駆動手段２７2 が
設けられる。The two intake valves 16, 16 and the crankshaft 6
Camshaft 26 which is interlocked and connected to the motor at a reduction ratio of 1/2
Between the intake valve 1 and the rotary movement of the camshaft 26.
Intake valve driving means 27 1 for converting the closing movement of the 6, 16 are provided, wherein the two exhaust valves 20, 20 a cam shaft 26
Between the rotation of the camshaft 26 and the exhaust valve 2.
Exhaust valve drive unit 27 2 for converting the closing movement of 0,20 is provided.
【００１３】図５を併せて参照して，カムシャフト２６
は，シリンダヘッド９と該シリンダヘッド９に結合され
るホルダ２８とで，クランク軸６の回転軸線と平行な軸
線を有して回転自在に支承される。このカムシャフト２
６には，吸気弁用高速カム２９と，一方の吸気弁１６に
対応して吸気弁用高速カム２９の一側に配置される吸気
弁用低速カム３０と，吸気弁用高速カム２９に関して吸
気弁用低速カム３０とは反対側で他方の吸気弁１６に対
応して配置される吸気弁用休止カム３１と，吸気弁用低
速カム３０および吸気弁用休止カム３１の両側で両排気
弁２０，２０に個別に対応して配置される排気弁用カム
３２，３２とがそれぞれ固設される。Referring also to FIG.
Is rotatably supported by a cylinder head 9 and a holder 28 coupled to the cylinder head 9 with an axis parallel to the rotation axis of the crankshaft 6. This camshaft 2
6, the intake valve high-speed cam 29, the intake valve low-speed cam 30 arranged on one side of the intake valve high-speed cam 29 corresponding to one of the intake valves 16, and the intake valve high-speed cam 29 The intake cam rest cam 31 arranged on the opposite side of the valve low speed cam 30 and corresponding to the other intake valve 16, and the exhaust valves 20 on both sides of the intake cam low speed cam 30 and the intake cam rest cam 31. , 20 and the exhaust valve cams 32, 32 respectively corresponding to the exhaust valve cams are fixedly provided.
【００１４】吸気弁用高速カム２９は，機関の高速運転
域で両吸気弁１６，１６を開閉作動せしめるための形状
を有するものであり，カムシャフト２６の軸線を中心と
する円弧状のベース円部２９ａと，該ベース円部２９ａ
から半径方向外方に張出す高位部２９ｂとを有する。吸
気弁用低速カム３０は，機関の低速運転域で一方の吸気
弁１６を開閉作動せしめるための形状を有するものであ
り，カムシャフト２６の軸線を中心とする円弧状のベー
ス円部３０ａと，カムシャフト２６の半径方向外方への
ベース円部３０ａからの張出量を吸気弁用高速カム２９
の高位部２９ｂよりも小とするとともに該高位部２９ｂ
よりも狭い中心角範囲にわたってベース円部３０ａから
張出した高位部３０ｂとを有する。また吸気弁用休止カ
ム３１は，機関の低速運転域で他方の吸気弁１６を実質
的に休止させるための形状を有するものであり，基本的
には前記両カム２９，３０のベース円部２９ａ，３０ａ
に対応した真円状に形成されるが，前記両カム２９，３
０の高位部２９ｂ，３０ｂに対応する部分には，吸気弁
１６を実質的には休止状態に保つものの該吸気弁１６の
吸気弁口１４への固着を回避すべくわずかに開弁させる
ための突部３１ａが設けられる。しかも吸気弁用低速カ
ム３０の軸方向に沿う幅Ｗ2 は吸気弁用高速カム２９の
幅Ｗ1 よりも小さく，また吸気弁用休止カム３１の軸方
向に沿う幅Ｗ 3 は吸気弁用低速カム３０の幅Ｗ2 よりも
小さい。さらに排気弁用カム３２，３２は，機関の運転
状態にかかわらず両排気弁２０，２０を開閉作動せしめ
るための形状を有する。The high-speed intake valve cam 29 is used for high-speed operation of the engine.
For opening and closing both intake valves 16, 16 in the region
With the axis of the camshaft 26 as the center.
Arc-shaped base circle portion 29a, and the base circle portion 29a
And a high portion 29b projecting radially outward from the upper portion. Sucking
The low-speed cam 30 for the valve operates with one intake air in the low-speed operation range of the engine.
It has a shape for opening and closing the valve 16.
And an arc-shaped base centered on the axis of the camshaft 26.
And the radially outward of the camshaft 26
The amount of overhang from the base circle portion 30a is determined by the high speed cam 29 for the intake valve.
And smaller than the high portion 29b of the
From the base circle portion 30a over a narrower central angle range
And a protruding high portion 30b. In addition, the suspension valve for the intake valve
The other intake valve 16 in the low-speed operation range of the engine.
It has a shape to temporarily suspend
The base circular portions 29a, 30a of the cams 29, 30
The two cams 29, 3
In the part corresponding to the high-order parts 29b and 30b of 0, there is an intake valve.
16 is substantially at rest, but the intake valve 16
Open slightly to avoid sticking to intake valve port 14
Projection 31a is provided. In addition, low-speed intake valves
Width W along the axial direction of the beam 30TwoIs the high-speed cam 29 for the intake valve.
Width W1Smaller than the axis of the rest cam 31 for the intake valve
Width W along the direction ThreeIs the width W of the low-speed cam 30 for the intake valve.Twothan
small. Further, the exhaust valve cams 32, 32
Open and close both exhaust valves 20, 20 regardless of the state
It has a shape for
【００１５】一方，吸気弁駆動手段２７1 は，相互に隣
接配置される吸気弁駆動部材としての第１，第２および
第３吸気弁側ロッカアーム３３，３４，３５と，それら
のロッカアーム３３〜３５の連動および連動解除を切換
可能な連動切換機構３６とを有するものであり，第１吸
気弁側ロッカアーム３３は一方の吸気弁１６に連動，連
結され，第３吸気弁側ロッカアーム３５は他方の吸気弁
１６に連動，連結され，第２吸気弁側ロッカアーム３４
は第１および第３吸気弁側ロッカアーム３３，３５間に
配置される。第１〜第３吸気弁側ロッカアーム３３〜３
５は，カムシャフト２６の斜め上方位置でホルダ２８に
固定的に支持された吸気弁側ロッカアームシャフト３７
で揺動自在に支承される。また排気弁駆動手段２７
2 は，各排気弁２０，２０に個別に連動，連結される排
気弁駆動部材としての一対の排気弁側ロッカアーム３
８，３８を有し，それらの排気弁側ロッカアーム３８，
３８は，カムシャフト２６の斜め上方位置でホルダ２８
に固定的に支持された排気弁側ロッカアームシャフト３
９で揺動自在に支承される。第１〜第３吸気弁側ロッカ
アーム３３〜３５はクランク軸６の軸線に沿うシリンダ
７の両側に配置されるホルダ２８，２８間に隣接配置さ
れ，両排気弁側ロッカアーム３８，３８は，排気弁側ロ
ッカアームシャフト３９を囲繞するコイルばね４２を相
互間に介設するようにして両ホルダ２８，２８間に配置
される。Meanwhile, the intake valve driving means 27 1, first as an intake valve driving members disposed adjacent to each other, the second and third intake valve side rocker arms 33, 34 and 35, those rocker arms 33 to 35 And an interlocking switching mechanism 36 capable of switching between interlocking and uncoupling of the first and second intake valves. The first intake valve side rocker arm 33 is interlocked and connected to one intake valve 16, and the third intake valve side rocker arm 35 is connected to the other intake valve. Interlocked with and connected to the valve 16, the second intake valve side rocker arm 34
Is disposed between the first and third intake valve side rocker arms 33 and 35. First to third intake valve side rocker arms 33 to 3
5 is an intake valve side rocker arm shaft 37 fixedly supported by the holder 28 at a position obliquely above the camshaft 26.
It is supported swingably. Exhaust valve driving means 27
2 is a pair of exhaust valve side rocker arms 3 as exhaust valve driving members which are individually linked to and connected to the respective exhaust valves 20 and 20.
8, 38, and their exhaust valve side rocker arms 38, 38
Reference numeral 38 denotes a holder 28 at an obliquely upper position
Valve side rocker arm shaft 3 fixedly supported on the shaft
At 9 it is supported swingably. The first to third intake valve side rocker arms 33 to 35 are disposed adjacent to the holders 28, 28 disposed on both sides of the cylinder 7 along the axis of the crankshaft 6, and both exhaust valve side rocker arms 38, 38 are provided with exhaust valves. A coil spring 42 surrounding the side rocker arm shaft 39 is disposed between the holders 28 so as to be interposed therebetween.
【００１６】吸気弁駆動手段２７1 において第１および
第３吸気弁側ロッカアーム３３，３５には，吸気弁１
６，１６側に延びる腕部３３ａ，３５ａが一体に設けら
れており，それらの腕部３３ａ，３５ａの先端には，両
吸気弁１６，１６の上端に当接するタペットねじ４０，
４０が進退自在に螺合される。また排気弁駆動手段２７
2 における両排気弁側ロッカアーム３８，３８には，両
排気弁２０，２０側に延びる腕部３８ａ，３８ａが一体
に設けられており，それらの腕部３８ａ，３８ａの先端
には，両排気弁２０，２０の上端に当接するタペットね
じ４１，４１が進退自在に螺合される。Intake valve driving means 271In the first and
The third intake valve side rocker arms 33 and 35 have an intake valve 1
Arms 33a, 35a extending to the 6, 16 side are provided integrally.
The ends of the arms 33a and 35a are
Tappet screws 40, which contact the upper ends of the intake valves 16, 16,
40 is screwed forward and backward freely. Exhaust valve driving means 27
TwoThe two rocker arms 38, 38 on the exhaust valve side at
Arms 38a, 38a extending toward the exhaust valves 20, 20 are integrated
At the ends of the arms 38a, 38a.
Is a tappet that contacts the upper ends of both exhaust valves 20 and 20
The threads 41, 41 are screwed forward and backward freely.
【００１７】第１吸気弁側ロッカアーム３３において，
その揺動軸線すなわち吸気弁側ロッカアームシャフト３
７の軸線に関して吸気弁１６とは反対側の端部には，吸
気弁用低速カム３０に摺接する円筒状の回転体４５が回
転自在に支承され，第２吸気弁側ロッカアーム３４にお
いて，その揺動軸線に関して両吸気弁１６，１６とは反
対側の端部には吸気弁用高速カム２９に摺接する円筒状
の回転体４６が回転自在に支承され，第３吸気弁側ロッ
カアーム３５において，その揺動軸線に関して吸気弁１
６とは反対側の端部には吸気弁用休止カム３１に摺接す
る円筒状の回転体４７が回転自在に支承され，両排気弁
側ロッカアーム３８，３８において，その揺動軸線すな
わち排気弁側ロッカアームシャフト３９の軸線に関して
両排気弁２０，２０とは反対側の端部には排気弁用カム
３２，３２に摺接する円筒状の回転体４８，４８が回転
自在に支承される。In the first intake valve side rocker arm 33,
Its swing axis, that is, the rocker arm shaft 3 on the intake valve side.
At the end opposite to the intake valve 16 with respect to the axis 7, a cylindrical rotating body 45 slidably in contact with the intake valve low-speed cam 30 is rotatably supported. At the end opposite to the intake valves 16, 16 with respect to the dynamic axis, a cylindrical rotary member 46 slidably in contact with the intake valve high-speed cam 29 is rotatably supported. Intake valve 1 with respect to swing axis
At the end opposite to 6, a rotatable cylindrical rotating body 47 slidingly in contact with the intake valve rest cam 31 is rotatably supported. Cylindrical rotating bodies 48, 48 slidably contacting the exhaust valve cams 32, 32 are rotatably supported at ends of the rocker arm shaft 39 opposite to the exhaust valves 20, 20 with respect to the axis.
【００１８】第１吸気弁側ロッカアーム３３には，第２
吸気弁側ロッカアーム３４側に開放した有底の嵌合穴４
９が吸気弁側ロッカアームシャフト３７と平行に穿設さ
れ，第２吸気弁側ロッカアーム３４には，嵌合穴４９に
対応して両側面に開口する嵌合孔５０が穿設され，第３
吸気弁側ロッカアーム３５には，嵌合孔５０に対応して
第２吸気弁側ロッカアーム３４側に開放した有底の嵌合
穴５１が吸気弁側ロッカアームシャフト３７と平行に穿
設される。而して前記嵌合穴４９，嵌合孔５０および嵌
合穴５１には，同径である円筒状軸部材５２，５３，５
４がそれぞれ嵌合，固定され，円筒状軸部材５２〜５４
と，それらの円筒状軸部材５２〜５４を同軸に囲繞する
回転体４５〜４７との間には複数のころ５５…，５６
…，５７…がそれぞれ介装される。また排気弁側ロッカ
アーム３８，３８には，両側面に開口する嵌合孔５８，
５８が排気弁側ロッカアームシャフト３９と平行に穿設
され，各嵌合孔５８，５８に嵌合，固定される円筒状軸
部材５９，５９と，それらの円筒状軸部材５９，５９を
同軸に囲繞する回転体４８，４８との間には複数のころ
６０…，６０…がそれぞれ介装される。したがって第１
〜第３吸気弁側ロッカアーム３３〜３５は回転体４５〜
４７を介して対応するカム３０，２９，３１にそれぞれ
摺接される。しかも吸気弁用高速カム２９の幅Ｗ1 ＞吸
気弁用低速カム３０の幅Ｗ2 ＞吸気弁用休止カム３１の
幅Ｗ3 であるので，回転体４６の軸方向長さ＞回転体４
５の軸方向長さ＞回転体４７の軸方向長さ，に設定され
ている。さらに排気弁側ロッカアーム２０，２０は回転
体４８，４８を介して排気弁用カム３２，３２にそれぞ
れ摺接される。The first intake valve side rocker arm 33 has a second
A bottomed fitting hole 4 opened to the intake valve side rocker arm 34 side.
9 is formed in parallel with the intake valve side rocker arm shaft 37, and fitting holes 50 are formed in the second intake valve side rocker arm 34 on both sides corresponding to the fitting holes 49, and the third hole is formed.
The intake valve side rocker arm 35 is provided with a bottomed fitting hole 51 opened to the second intake valve side rocker arm 34 side in parallel with the intake valve side rocker arm shaft 37 corresponding to the fitting hole 50. The fitting holes 49, 50 and 51 have cylindrical shaft members 52, 53, 5 having the same diameter.
4 are respectively fitted and fixed, and the cylindrical shaft members 52 to 54
A plurality of rollers 55..., 56 are provided between the rotary members 45 to 47 coaxially surrounding the cylindrical shaft members 52 to 54.
, 57 ... are interposed respectively. The exhaust valve side rocker arms 38, 38 have fitting holes 58,
58 is bored in parallel with the exhaust valve side rocker arm shaft 39, and the cylindrical shaft members 59, 59 fitted and fixed in the fitting holes 58, 58, and the cylindrical shaft members 59, 59 are coaxial. A plurality of rollers 60... 60 are interposed between the surrounding rotating bodies 48 and 48, respectively. Therefore the first
The third intake valve side rocker arms 33 to 35 are rotatable bodies 45 to
The respective cams 30, 29, and 31 are slidably contacted with each other via 47. In addition, since the width W 1 of the intake valve high-speed cam 29> the width W 2 of the intake valve low-speed cam 30> the width W 3 of the intake valve pause cam 31, the axial length of the rotating body 46> the rotating body 4
5, the length in the axial direction> the length in the axial direction of the rotating body 47. Further, the exhaust valve side rocker arms 20, 20 are slidably contacted with the exhaust valve cams 32, 32 via the rotating bodies 48, 48, respectively.
【００１９】各吸気弁側ロッカアーム３３〜３５ならび
に排気弁側ロッカアーム３８，３８の上方でホルダ２８
…上には支持板６１が固定されており，この支持板６１
には，第２吸気弁側ロッカアーム３４をその回転体４６
が吸気弁用高速カム２９に摺接する方向に弾発付勢する
ロストモーション機構６２が設けられ，該ロストモーシ
ョン機構６２は，下方に開放した有底円筒状に形成され
て支持板６１に固定されるガイド部材６３と，第２吸気
弁側ロッカアーム３４に先端を当接させてガイド部材６
３に摺動可能に嵌合されるリフタ６４と，リフタ６４お
よびガイド部材６３間に縮設されるリフタばね６５とを
備える。The holder 28 is located above the rocker arms 33 to 35 on the intake valve side and the rocker arms 38, 38 on the exhaust valve side.
A support plate 61 is fixed on the support plate 61.
The rocker arm 34 of the second intake valve side is
A lost motion mechanism 62 is provided which urges elastically in a direction in which it slides on the high-speed cam 29 for the intake valve. The lost motion mechanism 62 is formed in a cylindrical shape with a bottom opening downward and fixed to the support plate 61. The leading end of the guide member 63 and the second intake valve side rocker arm 34 are brought into contact with each other to
3 and a lifter spring 65 contracted between the lifter 64 and the guide member 63.
【００２０】連動切換機構３６は，第３および第２吸気
弁側ロッカアーム３５，３４の連動および連動解除を切
換可能な第１切換ピン６８と，第２および第１吸気弁側
ロッカアーム３４，３３の連動および連動解除を切換可
能な第２切換ピン６９と，第１切換ピン６８とは反対側
で第２切換ピン６９に摺接する規制部材７０と，規制部
材７０を第２切換ピン６９側に付勢する戻しばね７１と
を備える。The interlocking switching mechanism 36 includes a first switching pin 68 for switching the interlocking and releasing of the interlocking and interlocking of the third and second intake valve side rocker arms 35 and 34, and the second and first intake valve side rocker arms 34 and 33. A second switching pin 69 capable of switching between interlocking and uncoupling, a regulating member 70 slidably in contact with the second switching pin 69 on a side opposite to the first switching pin 68, and a regulating member 70 attached to the second switching pin 69. And a return spring 71 for biasing.
【００２１】第１切換ピン６８は，第３吸気弁側ロッカ
アーム３５の円筒状軸部材５４に摺動可能に嵌合される
ものであり，第３吸気弁側ロッカアーム３５における嵌
合穴５１の閉塞端と第１切換ピン６８との間には液圧室
７２が画成される。また第３吸気弁側ロッカアーム３５
には液圧室７２に通じる連通路７３が穿設され，吸気弁
側ロッカアームシャフト３７内には，前記連通路７３に
常時通じる液圧路７４が設けられる。而して該液圧路７
４は図示しない制御弁を介して液圧源に接続される。The first switching pin 68 is slidably fitted to the cylindrical shaft member 54 of the third intake valve side rocker arm 35, and closes the fitting hole 51 in the third intake valve side rocker arm 35. A hydraulic chamber 72 is defined between the end and the first switching pin 68. The third intake valve side rocker arm 35
A communication passage 73 communicating with the hydraulic pressure chamber 72 is formed in the shaft, and a hydraulic pressure passage 74 always communicating with the communication passage 73 is provided in the intake valve side rocker arm shaft 37. Thus, the hydraulic pressure path 7
Reference numeral 4 is connected to a hydraulic pressure source via a control valve (not shown).
【００２２】第２切換ピン６９は，第２吸気弁側ロッカ
アーム３４の円筒状軸部材５３に摺動可能に嵌合され，
第２切換ピン６９の一端は第１切換ピン６８に摺接され
ている。The second switching pin 69 is slidably fitted to the cylindrical shaft member 53 of the second intake valve side rocker arm 34.
One end of the second switching pin 69 is in sliding contact with the first switching pin 68.
【００２３】規制部材７０は，有底円筒状に形成されて
第１吸気弁側ロッカアーム３３の円筒状軸部材５２に摺
動可能に嵌合されるものであり，この規制部材７０の閉
塞端が第２切換ピン６９の他端に摺接される。また円筒
状軸部材５２の内面には，規制部材７０に当接して該規
制部材７０が円筒状軸部材５２から脱落するのを阻止す
るための止め輪７５が嵌着される。戻しばね７１は，第
１吸気弁側ロッカアーム３３における嵌合穴４９の閉塞
端と規制部材７０との間に縮設され，前記嵌合穴４９の
閉塞端には開放孔７６が穿設される。The restricting member 70 is formed in a cylindrical shape with a bottom and is slidably fitted to the cylindrical shaft member 52 of the first intake valve side rocker arm 33. The closed end of the restricting member 70 has a closed end. The other end of the second switching pin 69 is slidably contacted. A retaining ring 75 is fitted on the inner surface of the cylindrical shaft member 52 to abut against the restricting member 70 to prevent the restricting member 70 from dropping off the cylindrical shaft member 52. The return spring 71 is contracted between the closed end of the fitting hole 49 of the first intake valve side rocker arm 33 and the regulating member 70, and an open hole 76 is formed in the closed end of the fitting hole 49. .
【００２４】ところで，燃焼室１３の天井面中央部には
点火プラグ７８が配設されるものであり，該点火プラグ
７８を挿入するためのプラグパイプ７９がシリンダヘッ
ド９に配設される。而して吸気弁駆動手段２７1 におい
て，各吸気弁側ロッカアーム３３〜３５は吸気弁側ロッ
カアームシャフト３７に関して両吸気弁１６，１６とは
反対側で回転体４５〜４７を介してカムシャフト２６の
各カム３０，２９，３１に摺接されるものであって連動
切換機構３６もそれらの回転体４５〜４７と同軸に配置
されるので，第１および第３吸気弁側ロッカアーム３
３，３５の腕部３３ａ，３５ａ間には空きスペースがあ
り，その空きスペースに上記プラグパイプ７９を配設す
ることができる。したがって，吸気側を内方側に配置し
た車載用Ｖ型内燃機関において，点火プラグ７８の脱着
のためのプラグパイプ７９を，Ｖ型内燃機関の内方側に
配設することが可能となる。Incidentally, an ignition plug 78 is provided at the center of the ceiling surface of the combustion chamber 13, and a plug pipe 79 for inserting the ignition plug 78 is provided in the cylinder head 9. In Thus with an intake valve drive unit 27 1, the cam shaft 26 through the rotating body 45 to 47 on the opposite side of the intake valves 16, 16 for each intake valve side rocker arm 33 to 35 intake valve side rocker arm shaft 37 The first and third intake valve side rocker arms 3 are slidably contacted with the respective cams 30, 29 and 31 and are also coaxially arranged with the rotating members 45 to 47.
There is an empty space between the arms 33a, 35a of the third and the third 35, and the plug pipe 79 can be disposed in the empty space. Therefore, in a vehicle-mounted V-type internal combustion engine in which the intake side is disposed on the inner side, the plug pipe 79 for attaching and detaching the ignition plug 78 can be disposed on the inner side of the V-type internal combustion engine.
【００２５】次にこの実施例の作用について説明する
と，機関の低速運転域では，連動切換機構３６の液圧室
７２に液圧は作用しておらず，第１および第２切換ピン
６８，６９の摺接面は第３および第２吸気弁側ロッカア
ーム３４，３５間に対応する位置に在り，第２切換ピン
６９および規制部材７０の摺接面は第２および第１吸気
弁側ロッカアーム３４，３３間に対応する位置に在る。
したがって各吸気弁側ロッカアーム３３〜３５は相対揺
動可能な状態にあり，一方の吸気弁１６が吸気弁用低速
カム３０に応じたタイミングおよびリフト量で開閉駆動
されるのに対し，他方の吸気弁１６は実質的に休止され
ている。Next, the operation of this embodiment will be described. In the low speed operation range of the engine, the hydraulic pressure does not act on the hydraulic pressure chamber 72 of the interlocking switching mechanism 36, and the first and second switching pins 68 and 69 are operated. Is located at a position corresponding to between the third and second intake valve side rocker arms 34, 35, and the sliding contact surfaces of the second switching pin 69 and the regulating member 70 are the second and first intake valve side rocker arms 34, 35. 33.
Therefore, each of the intake valve side rocker arms 33 to 35 is in a state of relative swinging, and one intake valve 16 is opened and closed at a timing and a lift amount according to the intake valve low-speed cam 30, whereas the other intake valve 16 is opened and closed. Valve 16 is substantially at rest.
【００２６】機関の高速運転域では，連動切換機構３６
の液圧室７２に高圧の液圧が作用せしめられ，第１切換
ピン６８は第２切換ピン６９を押圧しながら第２吸気弁
側ロッカアーム３４の円筒状軸部材５３に嵌合し，第２
切換ピン６９は規制部材７０を押圧しながら第１吸気弁
側ロッカアーム３３の円筒状軸部材５２に嵌合する。し
たがって第１〜第３吸気弁側ロッカアーム３３〜３５は
一体的に連結された状態となり，両吸気弁１６，１６は
吸気弁用高速カム２９に応じたタイミングおよびリフト
量で開閉駆動されることになる。In the high-speed operation range of the engine, the interlocking switching mechanism 36
The first switching pin 68 is fitted to the cylindrical shaft member 53 of the second intake valve side rocker arm 34 while pressing the second switching pin 69, so that the second switching pin 69 is pressed.
The switching pin 69 is fitted to the cylindrical shaft member 52 of the first intake valve side rocker arm 33 while pressing the regulating member 70. Therefore, the first to third intake valve side rocker arms 33 to 35 are integrally connected, and both intake valves 16 and 16 are driven to open and close at a timing and a lift amount according to the intake valve high-speed cam 29. Become.
【００２７】このようにして機関の低速運転域および高
速運転域で両吸気弁１６，１６の開閉作動特性を変化さ
せることにより，機関の運転状態に適合した動弁特性と
して機関出力の向上を図ることができる。By changing the opening / closing operation characteristics of the intake valves 16 in the low-speed operation range and the high-speed operation range of the engine in this manner, the engine output is improved as the valve operation characteristic adapted to the operation state of the engine. be able to.
【００２８】一方，両排気弁２０，２０は，機関の低速
運転域および高速運転域とも，排気弁用カム３２，３２
に応じたタイミングおよびリフト量で開閉駆動されるこ
とになる。On the other hand, both exhaust valves 20 and 20 are provided with the exhaust valve cams 32 and 32 in both the low speed operation range and the high speed operation range of the engine.
Is driven to open and close at a timing and a lift amount according to.
【００２９】このような動弁装置において，吸気弁駆動
手段２７1 および排気弁駆動手段２７2 とも，各ロッカ
アーム３３〜３５，３８，３８は回転体４５〜４７，４
８，４８を介して対応するカム３０，２９，３１，３
２，３２に摺接するので，摩擦損失を低減して開弁動力
の低減を図ることができる。また第１〜第３吸気弁側ロ
ッカアーム３３〜３５に設けられる連動切換機構３６
は，前記回転体４５〜４７と同軸に配置されるものであ
り，連動切換機構３６を構成する切換ピン６８，６９，
規制部材７０および戻しばね７１は，回転体４５〜４７
を支承すべく各ロッカアーム３３〜３５に設けられた円
筒状軸部材５２〜５４内に挿入されるので，連動切換機
構３６を構成するための穿孔加工を各ロッカアーム３３
〜３５に施すことが不要となり，加工工数の低減に寄与
することができる。[0029] In such a valve system, intake valve driving means 27 1 and the exhaust valve driving means 27 2 Both the rocker arms 33～35,38,38 the rotator 45～47,4
Corresponding cams 30, 29, 31, 3 via 8, 48
Since the sliding contact is made between the sliding members 2 and 32, the frictional loss can be reduced and the valve opening power can be reduced. Further, an interlocking switching mechanism 36 provided on the first to third intake valve side rocker arms 33 to 35.
Are arranged coaxially with the rotating bodies 45 to 47, and constitute switching pins 68, 69,
The regulating member 70 and the return spring 71 are
Is inserted into the cylindrical shaft members 52 to 54 provided on the rocker arms 33 to 35 to support the rocker arms 33 to 35.
It is not necessary to apply them to the steps 35 to 35, which can contribute to a reduction in the number of processing steps.
【００３０】しかも点火プラグ７８を吸気弁１６，１６
側に配置することができるので，点火プラグ７８まわり
の熱引き性を向上することができ，最大トルクを発生さ
せる点火時期近傍に点火プラグ７８の点火時期を設定し
てもノッキングの発生を抑えることができ，したがって
充分な出力トルクを得ることができる。Further, the ignition plug 78 is connected to the intake valves 16 and 16.
Side, it is possible to improve the heat dissipation around the spark plug 78, and to suppress the occurrence of knocking even if the ignition timing of the spark plug 78 is set near the ignition timing at which the maximum torque is generated. Therefore, a sufficient output torque can be obtained.
【００３１】また吸気側を内方側に配置した車載用Ｖ型
内燃機関において，点火プラグ７８が吸気弁１６，１６
側に配置されることにより，点火プラグ７８の脱着のた
めのスペースをＶ型内燃機関の上方に確保すればよく，
点火プラグ７８の脱着のためのスペースを確保すること
が容易となる。In a vehicle-mounted V-type internal combustion engine in which the intake side is located on the inner side, the ignition plug 78 is connected to the intake valves 16, 16.
By arranging it on the side, a space for attaching and detaching the spark plug 78 may be secured above the V-type internal combustion engine.
It is easy to secure a space for attaching and detaching the spark plug 78.
【００３２】ところで，連動切換機構３６において，液
圧室７２に高圧の液圧を作用させたにもかかわらず，第
１および第２切換ピン６８，６９の連結作動が何らかの
原因により阻害され，連動切換機構３６が連動解除状態
のままとなる場合が考えられる。その場合，相互に独立
して作動する両吸気弁１６，１６のうち相対的に高リフ
トとなる吸気弁１６を駆動する第１吸気弁側ロッカアー
ム３３に，所定の高回転域まで動弁系挙動を保証するた
めに，弁ばね１９のばね荷重を第１吸気弁側ロッカアー
ム３３の重量に対応して比較的高く設定しておく必要が
ある。したがって第１吸気弁側ロッカアーム３３が比較
的大重量であれば，上記弁ばね１９のばね荷重もそれに
対応して大きく設定せねばならず，連動解除状態ならび
に連動状態での開弁動力が大きくなる。しかるに，相互
に独立して作動する両吸気弁１６，１６のうち相対的に
低リフトとなる吸気弁１６を駆動する第３吸気弁側ロッ
カアーム３５に液圧室７２および連通路７３が設けられ
ることにより，第１吸気弁側ロッカアーム３３は，液圧
室７２および連通路７３がない分だけ軽量化可能であ
り，したがって第１吸気弁側ロッカアーム３３を付勢す
るばね荷重を比較的低く設定して開弁動力の低減に寄与
することができる。By the way, in the interlocking switching mechanism 36, the connection operation of the first and second switching pins 68 and 69 is hindered by some cause, even though the high pressure is applied to the hydraulic chamber 72, and the interlocking operation is performed. It is conceivable that the switching mechanism 36 remains in the interlock release state. In this case, the first intake valve side rocker arm 33 that drives the intake valve 16 having a relatively high lift among the intake valves 16 that operate independently of each other is provided with a valve operating system behavior up to a predetermined high rotation range. Therefore, it is necessary to set the spring load of the valve spring 19 to be relatively high in accordance with the weight of the first intake valve side rocker arm 33. Therefore, if the first intake valve side rocker arm 33 is relatively heavy, the spring load of the valve spring 19 must be set correspondingly large, and the valve opening power in the interlocking release state and the interlocking state increases. . However, the hydraulic chamber 72 and the communication passage 73 are provided in the third intake valve side rocker arm 35 for driving the intake valve 16 having a relatively low lift among the intake valves 16, 16 that operate independently of each other. Accordingly, the first intake valve side rocker arm 33 can be reduced in weight by the absence of the hydraulic pressure chamber 72 and the communication passage 73. Therefore, the spring load for urging the first intake valve side rocker arm 33 is set relatively low. This can contribute to a reduction in valve opening power.
【００３３】また液圧室７２および連通路７３が設けら
れる第３吸気弁側ロッカアーム３５では，回転体４６の
軸方向長さ＞回転体４５の軸方向長さ＞回転体４７の軸
方向長さとなっているために，液圧室７２および連通路
７３を配設しても吸気弁側ロッカアームシャフト３７の
軸線に沿う幅を比較的小さく設定することが可能であ
り，それにより第３吸気弁側ロッカアーム３５の重量増
大を抑えて開弁動力低減に寄与することができるととも
に，カムシャフト２６の軸線に沿って動弁装置を比較的
コンパクトに構成することが可能となる。In the third intake valve side rocker arm 35 in which the hydraulic pressure chamber 72 and the communication passage 73 are provided, the axial length of the rotating body 46> the axial length of the rotating body 45> the axial length of the rotating body 47. Therefore, even if the hydraulic chamber 72 and the communication passage 73 are provided, the width of the rocker arm shaft 37 on the intake valve side along the axis can be set relatively small. The increase in the weight of the rocker arm 35 can be suppressed to contribute to the reduction of the valve opening power, and the valve operating device can be configured to be relatively compact along the axis of the camshaft 26.
【００３４】以上，本発明の実施例を詳述したが，本発
明は上記実施例に限定されるものではなく，特許請求の
範囲に記載された本発明を逸脱することなく種々の設計
変更を行なうことが可能である。Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.
【００３５】[0035]
【発明の効果】以上のように請求項１記載の発明によれ
ば，連動切換機構は，隣接する吸気弁駆動部材を連動さ
せる位置ならびにその連動を解除する位置間で移動可能
な切換ピンと，切換ピンの移動を案内すべく吸気弁駆動
部材に固設される円筒状軸部材とを備え，前記円筒状軸
部材には，カムシャフトに設けられたカムに摺接する円
筒状の回転体が回転自在に支承され，連動切換機構は吸
気弁駆動部材の揺動軸線に関して吸気弁とは反対側に配
置されるので，吸気側に点火プラグ等の部品を配置する
スペースを確保することが可能となる。As described above, according to the first aspect of the present invention, the interlocking switching mechanism includes the switching pin movable between the position for interlocking the adjacent intake valve driving member and the position for releasing the interlocking, and the switching mechanism. A cylindrical shaft member fixedly mounted on the intake valve driving member to guide the movement of the pin, wherein the cylindrical shaft member is rotatable with a cylindrical rotating body that slides on a cam provided on a cam shaft. Since the interlocking switching mechanism is disposed on the opposite side of the swing valve of the intake valve driving member from the intake valve, it is possible to secure a space for disposing components such as a spark plug on the intake side.
【００３６】また請求項２記載の発明によれば，請求項
１記載の発明の構成に加えて，点火プラグを挿入するた
めのプラグパイプが両吸気弁間でシリンダヘッドに連設
されるので，吸気弁側に点火プラグを配設して熱引き性
を向上させ，それにより機関出力の向上を図ることがで
きる。According to the second aspect of the invention, in addition to the configuration of the first aspect, a plug pipe for inserting a spark plug is connected to the cylinder head between the two intake valves. By disposing a spark plug on the intake valve side, the heat dissipation can be improved, and thereby the engine output can be improved.
【図１】Ｖ型内燃機関の側面図FIG. 1 is a side view of a V-type internal combustion engine.
【図２】図１の２−２線矢視拡大断面図FIG. 2 is an enlarged sectional view taken on line 2-2 of FIG. 1;
【図３】図２の３−３線断面図FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;
【図４】図２の４−４線断面図FIG. 4 is a sectional view taken along line 4-4 of FIG. 2;
【図５】図３の５−５線断面図FIG. 5 is a sectional view taken along line 5-5 in FIG. 3;
１６・・・・・・吸気弁 ２０・・・・・・排気弁 ２６・・・・・・カムシャフト ２９，３０，３１・・・・・・カム ３３，３４，３５・・・・・・吸気弁駆動部材としての
吸気弁側ロッカアーム ３６・・・・・・連動切換機構 ３８・・・・・・排気弁駆動部材としての排気弁側ロッ
カアーム ４５，４６，４７・・・・・・回転体 ５２，５３，５４・・・・・・円筒状軸部材 ６８，６９・・・・・・切換ピン16 Intake valve 20 Exhaust valve 26 Camshaft 29, 30, 31 Cam 33, 34, 35 Intake valve side rocker arm as intake valve driving member 36 Interlocking switching mechanism 38 Exhaust valve side rocker arm as exhaust valve driving member 45, 46, 47 ... Rotating body 52, 53, 54... Cylindrical shaft member 68, 69.
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成１４年２月６日（２００２．２．６）[Submission date] February 6, 2002 (2002.2.6)
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Correction target item name] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【書類名】 明細書[Document Name] Statement
【発明の名称】 内燃機関のＳＯＨＣ型動弁装置[Title of the Invention] SOHC type valve train for internal combustion engine
【特許請求の範囲】[Claims]
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【発明の属する技術分野】本発明は，吸気弁および排気
弁に対して共通に単一のカムシャフトが配設され，該カ
ムシャフトと吸気弁との間には，連動および連動解除を
切換可能な連動切換機構を有する複数の吸気弁駆動部材
が揺動可能に配設され，前記カムシャフトと排気弁との
間には，各排気弁に個別に対応する排気弁駆動部材が揺
動可能に配設される内燃機関のＳＯＨＣ型動弁装置に関
する。BACKGROUND OF THE INVENTION The present invention provides a single cam shaft is provided commonly to the intake valves and exhaust valves, the interlock and interlock canceling between the cam shaft and the intake valves a plurality of intake valve driving member having a switchable interlocking switching mechanism is arranged pivotably, between the exhaust valves and the camshafts, exhaust valves driving member corresponding individually to each of the exhaust valves The present invention relates to an SOHC type valve train for an internal combustion engine, which is swingably disposed.
【０００２】[0002]
【従来の技術】従来，かかる動弁装置は，たとえば特開
平４−１４０５号公報等で既に知られている。2. Description of the Related Art Conventionally, such a valve train is already known, for example, from Japanese Patent Application Laid-Open No. 4-1405.
【０００３】[0003]
【発明が解決しようとする課題】ところで，上記従来の
ものでは，一対の吸気弁に一端がそれぞれ連動，連結さ
れる２つのロッカアームを含む３つの吸気弁側ロッカア
ームの他端がローラーを介してカムにそれぞれ摺接さ
れ，それにより摩擦損失の低減が図られているが，連動
切換機構は各吸気弁側ロッカアームの一端および揺動軸
線間に設けられていたので，各吸気弁側ロッカアームの
一端寄りの中間部（連動切換機構が配設される部分）が
厚肉となる上，吸気弁上端部の弁ばね支持用リテーナと
干渉し易くなって，相隣なるロッカアーム相互間のリフ
ト量の設定自由度が狭くなる等の問題があった。また，
一対の排気弁に個別に連動，連結される一対の排気弁側
ロッカアームが上記３つの吸気弁側ロッカアームの両側
に配設されているので，点火プラグは，両排気弁側ロッ
カアーム間に配置せざるを得なかったが，排気側に点火
プラグを配置したのでは点火プラグの熱引き性を向上さ
せることは困難であり，その結果，ノッキング発生を防
止するためには最大トルクを発生させる点火時期近傍に
点火時期を設定することができず，充分なトルクを得難
いという問題がある。また，吸気側を内方側に配置した
車載用Ｖ型内燃機関に上記構造を適用したときには，点
火プラグを脱着するためのスペースを内燃機関の周囲に
確保し難いという問題がある。By the way, in the above conventional apparatus, the other ends of three intake valve side rocker arms including two rocker arms, one end of which is interlocked and connected to each of a pair of intake valves, are connected to a cam via a roller. To reduce friction loss. However, since the interlocking switching mechanism is provided at one end of each intake valve side rocker arm and between the pivot axes, the interlocking switching mechanism is provided for each intake valve side rocker arm.
The middle part near one end (the part where the interlocking switching mechanism is arranged)
In addition to being thicker, a retainer for supporting the valve spring at the upper end of the intake valve
It becomes easy to interfere, and the riff between adjacent rocker arms
However, there is a problem that the degree of freedom in setting the distance is reduced. Also,
Since a pair of exhaust valve side rocker arms which are individually interlocked and connected to the pair of exhaust valves are provided on both sides of the three intake valve side rocker arms, the spark plug is not required to be disposed between the two exhaust valve side rocker arms. However , it was difficult to improve the heat dissipation of the spark plug by arranging the spark plug on the exhaust side. As a result, in order to prevent knocking, the ignition timing near the maximum torque was generated. However, there is a problem that it is difficult to set the ignition timing, and it is difficult to obtain a sufficient torque. Further, when the above structure is applied to a vehicle-mounted V-type internal combustion engine in which the intake side is disposed on the inner side, there is a problem that it is difficult to secure a space around the internal combustion engine for attaching and detaching a spark plug.
【０００４】本発明は，かかる事情に鑑みてなされたも
のであり，摩擦損失の低減を図った上で吸気弁側に点火
プラグ等の他の部品を配置し得るスペースを確保した内
燃機関のＳＯＨＣ型動弁装置を提供することを目的とす
る。The present invention has been made in view of the above circumstances, and has been made to reduce the frictional loss and secure a space in which other components such as a spark plug can be arranged on the intake valve side. An object of the present invention is to provide a mold valve gear.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に，請求項１記載の発明によれば，吸気弁および排気弁
に対して共通に単一のカムシャフトが配設され，該カム
シャフトと吸気弁との間には，連動および連動解除を切
換可能な連動切換機構を有する複数の吸気弁駆動部材が
吸気側揺動支軸を介して揺動可能に配設され，前記カム
シャフトと排気弁との間には，各排気弁に個別に対応す
る排気弁駆動部材が排気側揺動支軸を介して揺動可能に
配設される内燃機関のＳＯＨＣ型動弁装置において，前
記カムシャフトは，吸気側揺動支軸よりも下方に配設さ
れ，前記連動切換機構は，吸気側揺動支軸から見て吸気
弁とは反対側に配置され，該連動切換機構は，隣接する
吸気弁駆動部材を連動させる位置ならびにその連動を解
除する位置間で移動可能な切換ピンと，切換ピンの移動
を案内すべく吸気弁駆動部材に固設される円筒状軸部材
とを備え，前記円筒状軸部材には，カムシャフトに設け
られたカムに摺接する円筒状の回転体が回転自在に支承
される。According to the first aspect of the present invention, an intake valve and an exhaust valve are provided.
A single camshaft is disposed in common with the
Interlock and release interlock between the shaft and intake valve
A plurality of intake valve drive members having interchangeable interlocking switching mechanisms
The cam is disposed so as to be swingable via an intake-side swing support shaft.
Each exhaust valve is individually supported between the shaft and the exhaust valve.
Exhaust valve drive member can swing through the exhaust-side swing support shaft.
In the installed SOHC type valve train of the internal combustion engine,
The camshaft is located below the pivot shaft on the intake side.
The interlocking switching mechanism is used to control the intake
The interlocking switching mechanism is disposed on a side opposite to the valve, the interlocking switching mechanism includes a switching pin movable between a position for interlocking the adjacent intake valve driving member and a position for releasing the interlocking, and an intake valve for guiding the movement of the switching pin. and a cylindrical shaft member which is fixed to the drive member, wherein the cylindrical shaft member, the cylindrical rotary member in sliding contact with a cam provided on the camshaft Ru is rotatably supported.
【０００６】また請求項２記載の発明によれば，上記請
求項１記載の発明の構成に加えて，複数の吸気弁駆動部
材のうちの特定の吸気弁駆動部材は，連動切換機構が連
動解除状態にあるときには吸気弁に対して自由となるも
のであり，その特定の吸気弁駆動部材をカム側に弾発付
勢するロストモーション機構が，該特定の吸気弁駆動部
材の，円筒状軸部材と吸気側揺動支軸との中間部外面に
当接する。[0006] According to the second aspect of the invention, in addition to the configuration of the invention described in claim 1, wherein the specific intake valve driving member of the multiple intake valve driving members, interlocking switching mechanism interlocked When in the release state, the intake valve is free with respect to the intake valve, and a lost motion mechanism for resiliently urging the specific intake valve driving member toward the cam is provided in the specific intake valve driving section.
On the outer surface of the intermediate part between the cylindrical shaft member and the intake side pivot
Abut
【０００７】[0007]
【発明の実施の形態】本発明の実施の形態を，添付図面
に例示した本発明の実施例に基づいて以下に具体的に説
明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on embodiments of the present invention illustrated in the accompanying drawings.
【０００８】添付図面において，図１ないし図５は本発
明の一実施例を示すものであり，図１はＶ型内燃機関の
側面図，図２は図１の２−２線矢視拡大断面図，図３は
図２の３−３線断面図，図４は図２の４−４線断面図，
図５は図３の５−５線断面図である。1 to 5 show an embodiment of the present invention. FIG. 1 is a side view of a V-type internal combustion engine, and FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. FIG. 3 is a sectional view taken along line 3-3 of FIG. 2, FIG. 4 is a sectional view taken along line 4-4 of FIG.
FIG. 5 is a sectional view taken along line 5-5 of FIG.
【０００９】先ず図１において，このＶ型内燃機関は，
クランク軸６の軸線方向に並ぶ１あるいは複数のシリン
ダ７と，該シリンダ７に対して上方に開いた略Ｖ字形に
配置されてクランク軸６の軸線方向に並ぶ１あるいは複
数のシリンダ７とがシリンダブロック８に設けられ，該
シリンダブロック８に結合されるシリンダヘッド９，９
に，上記Ｖ字形の内方側で各シリンダ７…の吸気ポート
１０…が設けられるとともに上記Ｖ字形の外方側で各シ
リンダ７…の排気ポート１１…が設けられ，シリンダヘ
ッド９，９間に各吸気ポート１０…に接続される吸気マ
ニホールドＭが配置されて成るものである。Referring first to FIG. 1, this V-type internal combustion engine
One or a plurality of cylinders 7 arranged in the axial direction of the crankshaft 6 and one or a plurality of cylinders 7 arranged in a substantially V-shape opened upward with respect to the cylinder 7 and arranged in the axial direction of the crankshaft 6 Cylinder heads 9, 9 provided in the block 8 and connected to the cylinder block 8
Are provided with intake ports 10 of the respective cylinders 7 on the inner side of the V-shape and exhaust ports 11 of the respective cylinders 7 on the outer side of the V-shape. And intake manifolds M connected to the respective intake ports 10.
【００１０】図２ないし図４を併せて参照して，シリン
ダ７にはピストン１２が摺動可能に嵌合され，該ピスト
ン１２の上面およびシリンダヘッド９間に燃焼室１３が
形成される。シリンダヘッド９には，燃焼室１３の天井
面に開口するようにして一対の吸気弁口１４…ならびに
一対の排気弁口１５…が設けられており，両吸気弁口１
４…は吸気ポート１０に連通され，両排気弁口１５…は
排気ポート１１に連通される。Referring also to FIGS. 2 to 4, a piston 12 is slidably fitted to the cylinder 7, and a combustion chamber 13 is formed between the upper surface of the piston 12 and the cylinder head 9. The cylinder head 9 is provided with a pair of intake valve ports 14 and a pair of exhaust valve ports 15 so as to open to the ceiling surface of the combustion chamber 13.
Are connected to the intake port 10, and both exhaust valve ports 15 are connected to the exhaust port 11.
【００１１】両吸気弁口１４…を個別に開閉可能な一対
の吸気弁１６，１６は，シリンダヘッド９にそれぞれ設
けられたガイド筒１７…に摺動可能に嵌合され，各ガイ
ド筒１７…から上方に突出した吸気弁１６，１６の上端
部に設けられるリテーナ１８，１８とシリンダヘッド９
との間には各吸気弁１６，１６を囲繞する弁ばね１９，
１９が縮設され，それらの弁ばね１９，１９により吸気
弁１６，１６は吸気弁口１４…を閉じる方向に付勢され
る。また両排気弁口１５…を個別に開閉可能な一対の排
気弁２０，２０は，シリンダヘッド９にそれぞれ設けら
れたガイド筒２１…に摺動可能に嵌合され，各ガイド筒
２１…から上方に突出した排気弁２０，２０の上端部に
設けられるリテーナ２２，２２とシリンダヘッド９との
間には各排気弁２０，２０を囲繞する弁ばね２３，２３
が縮設され，それらの弁ばね２３，２３により排気弁２
０，２０は排気弁口１５…を閉じる方向に付勢される。A pair of intake valves 16, 16, which can open and close both intake valve ports 14 individually, are slidably fitted to guide cylinders 17, respectively, provided on the cylinder head 9. Retainers 18, 18 provided at the upper ends of intake valves 16, 16 projecting upward from
And a valve spring 19 surrounding each intake valve 16, 16.
19 are contracted, and the intake valves 16, 16 are biased by the valve springs 19, 19 in a direction to close the intake valve ports 14. A pair of exhaust valves 20, 20 capable of individually opening and closing the two exhaust valve ports 15, are slidably fitted to guide cylinders 21 provided on the cylinder head 9, respectively. Valve springs 23, 23 surrounding the exhaust valves 20, 20 are provided between the cylinder head 9 and retainers 22, 22 provided at the upper end portions of the exhaust valves 20, 20 projecting from the cylinder head 9.
Are reduced, and the exhaust valve 2 is
0, 20 are urged in a direction to close the exhaust valve ports 15.
【００１２】上記両吸気弁１６，１６と，クランク軸６
に１／２の減速比で連動，連結されるカムシャフト２６
との間には，カムシャフト２６の回転運動を吸気弁１
６，１６の開閉運動に変換する吸気弁駆動手段２７1 が
設けられ，両排気弁２０，２０と前記カムシャフト２６
との間には，カムシャフト２６の回転運動を排気弁２
０，２０の開閉運動に変換する排気弁駆動手段２７2 が
設けられる。The two intake valves 16, 16 and the crankshaft 6
Camshaft 26 which is interlocked and connected to the motor at a reduction ratio of 1/2
Between the intake valve 1 and the rotary movement of the camshaft 26.
Intake valve driving means 27 1 for converting the closing movement of the 6, 16 are provided, wherein the two exhaust valves 20, 20 a cam shaft 26
Between the rotation of the camshaft 26 and the exhaust valve 2.
Exhaust valve drive unit 27 2 for converting the closing movement of 0,20 is provided.
【００１３】図５を併せて参照して，カムシャフト２６
は，シリンダヘッド９と該シリンダヘッド９に結合され
るホルダ２８とで，クランク軸６の回転軸線と平行な軸
線を有して回転自在に支承される。このカムシャフト２
６には，吸気弁用高速カム２９と，一方の吸気弁１６に
対応して吸気弁用高速カム２９の一側に配置される吸気
弁用低速カム３０と，吸気弁用高速カム２９に関して吸
気弁用低速カム３０とは反対側で他方の吸気弁１６に対
応して配置される吸気弁用休止カム３１と，吸気弁用低
速カム３０および吸気弁用休止カム３１の両側で両排気
弁２０，２０に個別に対応して配置される排気弁用カム
３２，３２とがそれぞれ固設される。Referring also to FIG.
Is rotatably supported by a cylinder head 9 and a holder 28 coupled to the cylinder head 9 with an axis parallel to the rotation axis of the crankshaft 6. This camshaft 2
6, the intake valve high-speed cam 29, the intake valve low-speed cam 30 arranged on one side of the intake valve high-speed cam 29 corresponding to one of the intake valves 16, and the intake valve high-speed cam 29 The intake cam rest cam 31 arranged on the opposite side of the valve low speed cam 30 and corresponding to the other intake valve 16, and the exhaust valves 20 on both sides of the intake cam low speed cam 30 and the intake cam rest cam 31. , 20 and the exhaust valve cams 32, 32 respectively corresponding to the exhaust valve cams are fixedly provided.
【００１４】吸気弁用高速カム２９は，機関の高速運転
域で両吸気弁１６，１６を開閉作動せしめるための形状
を有するものであり，カムシャフト２６の軸線を中心と
する円弧状のベース円部２９ａと，該ベース円部２９ａ
から半径方向外方に張出す高位部２９ｂとを有する。吸
気弁用低速カム３０は，機関の低速運転域で一方の吸気
弁１６を開閉作動せしめるための形状を有するものであ
り，カムシャフト２６の軸線を中心とする円弧状のベー
ス円部３０ａと，カムシャフト２６の半径方向外方への
ベース円部３０ａからの張出量を吸気弁用高速カム２９
の高位部２９ｂよりも小とするとともに該高位部２９ｂ
よりも狭い中心角範囲にわたってベース円部３０ａから
張出した高位部３０ｂとを有する。また吸気弁用休止カ
ム３１は，機関の低速運転域で他方の吸気弁１６を実質
的に休止させるための形状を有するものであり，基本的
には前記両カム２９，３０のベース円部２９ａ，３０ａ
に対応した真円状に形成されるが，前記両カム２９，３
０の高位部２９ｂ，３０ｂに対応する部分には，吸気弁
１６を実質的には休止状態に保つものの該吸気弁１６の
吸気弁口１４への固着を回避すべくわずかに開弁させる
ための突部３１ａが設けられる。しかも吸気弁用低速カ
ム３０の軸方向に沿う幅Ｗ2 は吸気弁用高速カム２９の
幅Ｗ1 よりも小さく，また吸気弁用休止カム３１の軸方
向に沿う幅Ｗ 3 は吸気弁用低速カム３０の幅Ｗ2 よりも
小さい。さらに排気弁用カム３２，３２は，機関の運転
状態にかかわらず両排気弁２０，２０を開閉作動せしめ
るための形状を有する。The high-speed intake valve cam 29 is used for high-speed operation of the engine.
For opening and closing both intake valves 16, 16 in the region
With the axis of the camshaft 26 as the center.
Arc-shaped base circle portion 29a, and the base circle portion 29a
And a high portion 29b projecting radially outward from the upper portion. Sucking
The low-speed cam 30 for the valve operates with one intake air in the low-speed operation range of the engine.
It has a shape for opening and closing the valve 16.
And an arc-shaped base centered on the axis of the camshaft 26.
And the radially outward of the camshaft 26
The amount of overhang from the base circle portion 30a is determined by the high speed cam 29 for the intake valve.
And smaller than the high portion 29b of the
From the base circle portion 30a over a narrower central angle range
And a protruding high portion 30b. In addition, the suspension valve for the intake valve
The other intake valve 16 in the low-speed operation range of the engine.
It has a shape to temporarily suspend
The base circular portions 29a, 30a of the cams 29, 30
The two cams 29, 3
In the part corresponding to the high-order parts 29b and 30b of 0, there is an intake valve.
16 is substantially at rest, but the intake valve 16
Open slightly to avoid sticking to intake valve port 14
Projection 31a is provided. In addition, low-speed intake valves
Width W along the axial direction of the beam 30TwoIs the high-speed cam 29 for the intake valve.
Width W1Smaller than the axis of the rest cam 31 for the intake valve
Width W along the direction ThreeIs the width W of the low-speed cam 30 for the intake valve.Twothan
small. Further, the exhaust valve cams 32, 32
Open and close both exhaust valves 20, 20 regardless of the state
It has a shape for
【００１５】一方，吸気弁駆動手段２７1 は，相互に隣
接配置される吸気弁駆動部材としての第１，第２および
第３吸気弁側ロッカアーム３３，３４，３５と，それら
のロッカアーム３３〜３５の連動および連動解除を切換
可能な連動切換機構３６とを有するものであり，第１吸
気弁側ロッカアーム３３は一方の吸気弁１６に連動，連
結され，第３吸気弁側ロッカアーム３５は他方の吸気弁
１６に連動，連結され，第２吸気弁側ロッカアーム３４
は第１および第３吸気弁側ロッカアーム３３，３５間に
配置される。第１〜第３吸気弁側ロッカアーム３３〜３
５は，カムシャフト２６の斜め上方位置でホルダ２８に
固定的に支持された吸気弁側ロッカアームシャフト３７
で揺動自在に支承される。また排気弁駆動手段２７
2 は，各排気弁２０，２０に個別に連動，連結される排
気弁駆動部材としての一対の排気弁側ロッカアーム３
８，３８を有し，それらの排気弁側ロッカアーム３８，
３８は，カムシャフト２６の斜め上方位置でホルダ２８
に固定的に支持された排気弁側ロッカアームシャフト３
９で揺動自在に支承される。第１〜第３吸気弁側ロッカ
アーム３３〜３５はクランク軸６の軸線に沿うシリンダ
７の両側に配置されるホルダ２８，２８間に隣接配置さ
れ，両排気弁側ロッカアーム３８，３８は，排気弁側ロ
ッカアームシャフト３９を囲繞するコイルばね４２を相
互間に介設するようにして両ホルダ２８，２８間に配置
される。Meanwhile, the intake valve driving means 27 1, first as an intake valve driving members disposed adjacent to each other, the second and third intake valve side rocker arms 33, 34 and 35, those rocker arms 33 to 35 And an interlocking switching mechanism 36 capable of switching between interlocking and uncoupling of the first and second intake valves. The first intake valve side rocker arm 33 is interlocked and connected to one intake valve 16, and the third intake valve side rocker arm 35 is connected to the other intake valve. Interlocked with and connected to the valve 16, the second intake valve side rocker arm 34
Is disposed between the first and third intake valve side rocker arms 33 and 35. First to third intake valve side rocker arms 33 to 3
5 is an intake valve side rocker arm shaft 37 fixedly supported by the holder 28 at a position obliquely above the camshaft 26.
It is supported swingably. Exhaust valve driving means 27
2 is a pair of exhaust valve side rocker arms 3 as exhaust valve driving members which are individually linked to and connected to the respective exhaust valves 20 and 20.
8, 38, and their exhaust valve side rocker arms 38, 38
38 is a holder 28 at an obliquely upper position of the camshaft 26.
Valve side rocker arm shaft 3 fixedly supported on the shaft
At 9 it is supported swingably. The first to third intake valve side rocker arms 33 to 35 are disposed adjacent to the holders 28, 28 disposed on both sides of the cylinder 7 along the axis of the crankshaft 6, and both exhaust valve side rocker arms 38, 38 are provided with exhaust valves. A coil spring 42 surrounding the side rocker arm shaft 39 is disposed between the holders 28 so as to be interposed therebetween.
【００１６】吸気弁駆動手段２７1 において第１および
第３吸気弁側ロッカアーム３３，３５には，吸気弁１
６，１６側に延びる腕部３３ａ，３５ａが一体に設けら
れており，それらの腕部３３ａ，３５ａの先端には，両
吸気弁１６，１６の上端に当接するタペットねじ４０，
４０が進退自在に螺合される。また排気弁駆動手段２７
2 における両排気弁側ロッカアーム３８，３８には，両
排気弁２０，２０側に延びる腕部３８ａ，３８ａが一体
に設けられており，それらの腕部３８ａ，３８ａの先端
には，両排気弁２０，２０の上端に当接するタペットね
じ４１，４１が進退自在に螺合される。Intake valve driving means 271In the first and
The third intake valve side rocker arms 33 and 35 have an intake valve 1
Arms 33a, 35a extending to the 6, 16 side are provided integrally.
The ends of the arms 33a and 35a are
Tappet screws 40, which contact the upper ends of the intake valves 16, 16,
40 is screwed forward and backward freely. Exhaust valve driving means 27
TwoThe two rocker arms 38, 38 on the exhaust valve side at
Arms 38a, 38a extending toward the exhaust valves 20, 20 are integrated
At the ends of the arms 38a, 38a.
Is a tappet that contacts the upper ends of both exhaust valves 20 and 20
The threads 41, 41 are screwed forward and backward freely.
【００１７】第１吸気弁側ロッカアーム３３において，
その揺動軸線すなわち吸気弁側ロッカアームシャフト３
７の軸線に関して吸気弁１６とは反対側の端部には，吸
気弁用低速カム３０に摺接する円筒状の回転体４５が回
転自在に支承され，第２吸気弁側ロッカアーム３４にお
いて，その揺動軸線に関して両吸気弁１６，１６とは反
対側の端部には吸気弁用高速カム２９に摺接する円筒状
の回転体４６が回転自在に支承され，第３吸気弁側ロッ
カアーム３５において，その揺動軸線に関して吸気弁１
６とは反対側の端部には吸気弁用休止カム３１に摺接す
る円筒状の回転体４７が回転自在に支承され，両排気弁
側ロッカアーム３８，３８において，その揺動軸線すな
わち排気弁側ロッカアームシャフト３９の軸線に関して
両排気弁２０，２０とは反対側の端部には排気弁用カム
３２，３２に摺接する円筒状の回転体４８，４８が回転
自在に支承される。In the first intake valve side rocker arm 33,
Its swing axis, that is, the rocker arm shaft 3 on the intake valve side.
At the end opposite to the intake valve 16 with respect to the axis 7, a cylindrical rotating body 45 slidably in contact with the intake valve low-speed cam 30 is rotatably supported. At the end opposite to the intake valves 16, 16 with respect to the dynamic axis, a cylindrical rotary member 46 slidably in contact with the intake valve high-speed cam 29 is rotatably supported. Intake valve 1 with respect to swing axis
At the end opposite to 6, a rotatable cylindrical rotating body 47 slidingly in contact with the intake valve rest cam 31 is rotatably supported. Cylindrical rotating bodies 48, 48 slidably contacting the exhaust valve cams 32, 32 are rotatably supported at ends of the rocker arm shaft 39 opposite to the exhaust valves 20, 20 with respect to the axis.
【００１８】第１吸気弁側ロッカアーム３３には，第２
吸気弁側ロッカアーム３４側に開放した有底の嵌合穴４
９が吸気弁側ロッカアームシャフト３７と平行に穿設さ
れ，第２吸気弁側ロッカアーム３４には，嵌合穴４９に
対応して両側面に開口する嵌合孔５０が穿設され，第３
吸気弁側ロッカアーム３５には，嵌合孔５０に対応して
第２吸気弁側ロッカアーム３４側に開放した有底の嵌合
穴５１が吸気弁側ロッカアームシャフト３７と平行に穿
設される。而して前記嵌合穴４９，嵌合孔５０および嵌
合穴５１には，同径である円筒状軸部材５２，５３，５
４がそれぞれ嵌合，固定され，円筒状軸部材５２〜５４
と，それらの円筒状軸部材５２〜５４を同軸に囲繞する
回転体４５〜４７との間には複数のころ５５…，５６
…，５７…がそれぞれ介装される。また排気弁側ロッカ
アーム３８，３８には，両側面に開口する嵌合孔５８，
５８が排気弁側ロッカアームシャフト３９と平行に穿設
され，各嵌合孔５８，５８に嵌合，固定される円筒状軸
部材５９，５９と，それらの円筒状軸部材５９，５９を
同軸に囲繞する回転体４８，４８との間には複数のころ
６０…，６０…がそれぞれ介装される。したがって第１
〜第３吸気弁側ロッカアーム３３〜３５は回転体４５〜
４７を介して対応するカム３０，２９，３１にそれぞれ
摺接される。しかも吸気弁用高速カム２９の幅Ｗ1 ＞吸
気弁用低速カム３０の幅Ｗ2 ＞吸気弁用休止カム３１の
幅Ｗ3 であるので，回転体４６の軸方向長さ＞回転体４
５の軸方向長さ＞回転体４７の軸方向長さ，に設定され
ている。さらに排気弁側ロッカアーム２０，２０は回転
体４８，４８を介して排気弁用カム３２，３２にそれぞ
れ摺接される。The first intake valve side rocker arm 33 has a second
A bottomed fitting hole 4 opened to the intake valve side rocker arm 34 side.
9 is formed in parallel with the intake valve side rocker arm shaft 37, and fitting holes 50 are formed in the second intake valve side rocker arm 34 on both sides corresponding to the fitting holes 49, and the third hole is formed.
The intake valve side rocker arm 35 is provided with a bottomed fitting hole 51 opened to the second intake valve side rocker arm 34 side in parallel with the intake valve side rocker arm shaft 37 corresponding to the fitting hole 50. The fitting holes 49, 50 and 51 have cylindrical shaft members 52, 53, 5 having the same diameter.
4 are respectively fitted and fixed, and the cylindrical shaft members 52 to 54
A plurality of rollers 55..., 56 are provided between the rotary members 45 to 47 coaxially surrounding the cylindrical shaft members 52 to 54.
, 57 ... are interposed respectively. The exhaust valve side rocker arms 38, 38 have fitting holes 58,
58 is bored in parallel with the exhaust valve side rocker arm shaft 39, and the cylindrical shaft members 59, 59 fitted and fixed in the fitting holes 58, 58, and the cylindrical shaft members 59, 59 are coaxial. A plurality of rollers 60... 60 are interposed between the surrounding rotating bodies 48 and 48, respectively. Therefore the first
The third intake valve side rocker arms 33 to 35 are rotatable bodies 45 to
The respective cams 30, 29, and 31 are slidably contacted with each other via 47. In addition, since the width W 1 of the intake valve high-speed cam 29> the width W 2 of the intake valve low-speed cam 30> the width W 3 of the intake valve pause cam 31, the axial length of the rotating body 46> the rotating body 4
5, the length in the axial direction> the length in the axial direction of the rotating body 47. Further, the exhaust valve side rocker arms 20, 20 are slidably contacted with the exhaust valve cams 32, 32 via the rotating bodies 48, 48, respectively.
【００１９】各吸気弁側ロッカアーム３３〜３５ならび
に排気弁側ロッカアーム３８，３８の上方でホルダ２８
…上には支持板６１が固定されており，この支持板６１
には，第２吸気弁側ロッカアーム３４をその回転体４６
が吸気弁用高速カム２９に摺接する方向に弾発付勢する
ロストモーション機構６２が設けられ，該ロストモーシ
ョン機構６２は，下方に開放した有底円筒状に形成され
て支持板６１に固定されるガイド部材６３と，第２吸気
弁側ロッカアーム３４に先端を当接させてガイド部材６
３に摺動可能に嵌合されるリフタ６４と，リフタ６４お
よびガイド部材６３間に縮設されるリフタばね６５とを
備える。この場合，リフタ６４の先端は，第２吸気弁側
ロッカアーム３４の，吸気弁側ロッカアームシャフト３
７と円筒状軸部材５３との中間部上面に当接しているた
め，リフタ６４（ロストモーション機構６２）に対する
受け座を該第２吸気弁側ロッカアーム３４の一端から特
別に延設（例えば特開昭63-100211 号公報の第３図参
照）させる必要はなくなり，それだけ第２吸気弁側ロッ
カアーム３４の構造簡素化と小型化が図られる。 The holder 28 is located above the rocker arms 33 to 35 on the intake valve side and the rocker arms 38, 38 on the exhaust valve side.
A support plate 61 is fixed on the support plate 61.
The rocker arm 34 of the second intake valve side is
A lost motion mechanism 62 is provided which urges elastically in a direction in which it slides on the high-speed cam 29 for the intake valve. The lost motion mechanism 62 is formed in a cylindrical shape with a bottom opening downward and fixed to the support plate 61. The leading end of the guide member 63 and the second intake valve side rocker arm 34 are brought into contact with each other to
3 and a lifter spring 65 contracted between the lifter 64 and the guide member 63. In this case, the tip of the lifter 64 is connected to the second intake valve side.
Rocker arm shaft 3 of rocker arm 34 on the intake valve side
7 and the upper surface of the intermediate portion between the cylindrical shaft member 53
For lifter 64 (lost motion mechanism 62)
The receiving seat is specially moved from one end of the second intake valve side rocker arm 34.
Separately installed (for example, see FIG. 3 of JP-A-63-100211).
It is no longer necessary to lock the second intake valve.
The structure of the arm 34 is simplified and the size of the arm 34 is reduced.
【００２０】連動切換機構３６は，第３および第２吸気
弁側ロッカアーム３５，３４の連動および連動解除を切
換可能な第１切換ピン６８と，第２および第１吸気弁側
ロッカアーム３４，３３の連動および連動解除を切換可
能な第２切換ピン６９と，第１切換ピン６８とは反対側
で第２切換ピン６９に摺接する規制部材７０と，規制部
材７０を第２切換ピン６９側に付勢する戻しばね７１と
を備える。The interlocking switching mechanism 36 includes a first switching pin 68 for switching the interlocking and releasing of the interlocking and interlocking of the third and second intake valve side rocker arms 35 and 34, and the second and first intake valve side rocker arms 34 and 33. A second switching pin 69 capable of switching between interlocking and uncoupling, a regulating member 70 slidably in contact with the second switching pin 69 on a side opposite to the first switching pin 68, and a regulating member 70 attached to the second switching pin 69. And a return spring 71 for biasing.
【００２１】第１切換ピン６８は，第３吸気弁側ロッカ
アーム３５の円筒状軸部材５４に摺動可能に嵌合される
ものであり，第３吸気弁側ロッカアーム３５における嵌
合穴５１の閉塞端と第１切換ピン６８との間には液圧室
７２が画成される。また第３吸気弁側ロッカアーム３５
には液圧室７２に通じる連通路７３が穿設され，吸気弁
側ロッカアームシャフト３７内には，前記連通路７３に
常時通じる液圧路７４が設けられる。而して該液圧路７
４は図示しない制御弁を介して液圧源に接続される。The first switching pin 68 is slidably fitted to the cylindrical shaft member 54 of the third intake valve side rocker arm 35, and closes the fitting hole 51 in the third intake valve side rocker arm 35. A hydraulic chamber 72 is defined between the end and the first switching pin 68. The third intake valve side rocker arm 35
A communication passage 73 communicating with the hydraulic pressure chamber 72 is formed in the shaft, and a hydraulic pressure passage 74 always communicating with the communication passage 73 is provided in the intake valve side rocker arm shaft 37. Thus, the hydraulic pressure path 7
Reference numeral 4 is connected to a hydraulic pressure source via a control valve (not shown).
【００２２】第２切換ピン６９は，第２吸気弁側ロッカ
アーム３４の円筒状軸部材５３に摺動可能に嵌合され，
第２切換ピン６９の一端は第１切換ピン６８に摺接され
ている。The second switching pin 69 is slidably fitted to the cylindrical shaft member 53 of the second intake valve side rocker arm 34.
One end of the second switching pin 69 is in sliding contact with the first switching pin 68.
【００２３】規制部材７０は，有底円筒状に形成されて
第１吸気弁側ロッカアーム３３の円筒状軸部材５２に摺
動可能に嵌合されるものであり，この規制部材７０の閉
塞端が第２切換ピン６９の他端に摺接される。また円筒
状軸部材５２の内面には，規制部材７０に当接して該規
制部材７０が円筒状軸部材５２から脱落するのを阻止す
るための止め輪７５が嵌着される。戻しばね７１は，第
１吸気弁側ロッカアーム３３における嵌合穴４９の閉塞
端と規制部材７０との間に縮設され，前記嵌合穴４９の
閉塞端には開放孔７６が穿設される。The restricting member 70 is formed in a cylindrical shape with a bottom and is slidably fitted to the cylindrical shaft member 52 of the first intake valve side rocker arm 33. The closed end of the restricting member 70 has a closed end. The other end of the second switching pin 69 is slidably contacted. A retaining ring 75 is fitted on the inner surface of the cylindrical shaft member 52 to abut against the restricting member 70 to prevent the restricting member 70 from dropping off the cylindrical shaft member 52. The return spring 71 is contracted between the closed end of the fitting hole 49 of the first intake valve side rocker arm 33 and the regulating member 70, and an open hole 76 is formed in the closed end of the fitting hole 49. .
【００２４】ところで，燃焼室１３の天井面中央部には
点火プラグ７８が配設されるものであり，該点火プラグ
７８を挿入するためのプラグパイプ７９がシリンダヘッ
ド９に配設される。而して吸気弁駆動手段２７1 におい
て，各吸気弁側ロッカアーム３３〜３５は吸気弁側ロッ
カアームシャフト３７に関して両吸気弁１６，１６とは
反対側で回転体４５〜４７を介してカムシャフト２６の
各カム３０，２９，３１に摺接されるものであって連動
切換機構３６もそれらの回転体４５〜４７と同軸に配置
されるので，第１および第３吸気弁側ロッカアーム３
３，３５の腕部３３ａ，３５ａ間には空きスペースがあ
り，その空きスペースに上記プラグパイプ７９を配設す
ることができる。したがって，吸気側を内方側に配置し
た車載用Ｖ型内燃機関において，点火プラグ７８の脱着
のためのプラグパイプ７９を，Ｖ型内燃機関の内方側に
配設することが可能となる。Incidentally, an ignition plug 78 is provided at the center of the ceiling surface of the combustion chamber 13, and a plug pipe 79 for inserting the ignition plug 78 is provided in the cylinder head 9. In Thus with an intake valve drive unit 27 1, the cam shaft 26 through the rotating body 45 to 47 on the opposite side of the intake valves 16, 16 for each intake valve side rocker arm 33 to 35 intake valve side rocker arm shaft 37 The first and third intake valve side rocker arms 3 are slidably contacted with the respective cams 30, 29 and 31 and are also coaxially arranged with the rotating members 45 to 47.
There is an empty space between the arms 33a, 35a of the third and the third 35, and the plug pipe 79 can be disposed in the empty space. Therefore, in a vehicle-mounted V-type internal combustion engine in which the intake side is disposed on the inner side, the plug pipe 79 for attaching and detaching the ignition plug 78 can be disposed on the inner side of the V-type internal combustion engine.
【００２５】次にこの実施例の作用について説明する
と，機関の低速運転域では，連動切換機構３６の液圧室
７２に液圧は作用しておらず，第１および第２切換ピン
６８，６９の摺接面は第３および第２吸気弁側ロッカア
ーム３４，３５間に対応する位置に在り，第２切換ピン
６９および規制部材７０の摺接面は第２および第１吸気
弁側ロッカアーム３４，３３間に対応する位置に在る。
したがって各吸気弁側ロッカアーム３３〜３５は相対揺
動可能な状態にあり，一方の吸気弁１６が吸気弁用低速
カム３０に応じたタイミングおよびリフト量で開閉駆動
されるのに対し，他方の吸気弁１６は実質的に休止され
ている。Next, the operation of this embodiment will be described. In the low speed operation range of the engine, the hydraulic pressure does not act on the hydraulic pressure chamber 72 of the interlocking switching mechanism 36, and the first and second switching pins 68 and 69 are operated. Is located at a position corresponding to between the third and second intake valve side rocker arms 34, 35, and the sliding contact surfaces of the second switching pin 69 and the regulating member 70 are the second and first intake valve side rocker arms 34, 35. 33.
Therefore, each of the intake valve side rocker arms 33 to 35 is in a state of relative swinging, and one intake valve 16 is opened and closed at a timing and a lift amount according to the intake valve low-speed cam 30, whereas the other intake valve 16 is opened and closed. Valve 16 is substantially at rest.
【００２６】機関の高速運転域では，連動切換機構３６
の液圧室７２に高圧の液圧が作用せしめられ，第１切換
ピン６８は第２切換ピン６９を押圧しながら第２吸気弁
側ロッカアーム３４の円筒状軸部材５３に嵌合し，第２
切換ピン６９は規制部材７０を押圧しながら第１吸気弁
側ロッカアーム３３の円筒状軸部材５２に嵌合する。し
たがって第１〜第３吸気弁側ロッカアーム３３〜３５は
一体的に連結された状態となり，両吸気弁１６，１６は
吸気弁用高速カム２９に応じたタイミングおよびリフト
量で開閉駆動されることになる。In the high-speed operation range of the engine, the interlocking switching mechanism 36
The first switching pin 68 is fitted to the cylindrical shaft member 53 of the second intake valve side rocker arm 34 while pressing the second switching pin 69, so that the second switching pin 69 is pressed.
The switching pin 69 is fitted to the cylindrical shaft member 52 of the first intake valve side rocker arm 33 while pressing the regulating member 70. Therefore, the first to third intake valve side rocker arms 33 to 35 are integrally connected, and both intake valves 16 and 16 are driven to open and close at a timing and a lift amount according to the intake valve high-speed cam 29. Become.
【００２７】このようにして機関の低速運転域および高
速運転域で両吸気弁１６，１６の開閉作動特性を変化さ
せることにより，機関の運転状態に適合した動弁特性と
して機関出力の向上を図ることができる。By changing the opening / closing operation characteristics of the intake valves 16 in the low-speed operation range and the high-speed operation range of the engine in this manner, the engine output is improved as the valve operation characteristic adapted to the operation state of the engine. be able to.
【００２８】一方，両排気弁２０，２０は，機関の低速
運転域および高速運転域とも，排気弁用カム３２，３２
に応じたタイミングおよびリフト量で開閉駆動されるこ
とになる。On the other hand, both exhaust valves 20 and 20 are provided with the exhaust valve cams 32 and 32 in both the low speed operation range and the high speed operation range of the engine.
Is driven to open and close at a timing and a lift amount according to.
【００２９】このような動弁装置において，吸気弁駆動
手段２７1 および排気弁駆動手段２７2 とも，各ロッカ
アーム３３〜３５，３８，３８は回転体４５〜４７，４
８，４８を介して対応するカム３０，２９，３１，３
２，３２に摺接するので，摩擦損失を低減して開弁動力
の低減を図ることができる。また第１〜第３吸気弁側ロ
ッカアーム３３〜３５に設けられる連動切換機構３６
は，前記回転体４５〜４７と同軸に配置されるものであ
り，連動切換機構３６を構成する切換ピン６８，６９，
規制部材７０および戻しばね７１は，回転体４５〜４７
を支承すべく各ロッカアーム３３〜３５に設けられた円
筒状軸部材５２〜５４内に挿入されるので，連動切換機
構３６を構成するための穿孔加工を各ロッカアーム３３
〜３５に施すことが不要となり，加工工数の低減に寄与
することができる。[0029] In such a valve system, intake valve driving means 27 1 and the exhaust valve driving means 27 2 both the rocker arms 33～35,38,38 the rotator 45～47,4
Corresponding cams 30, 29, 31, 3 via 8, 48
Since the sliding contact is made between the sliding members 2 and 32, the frictional loss can be reduced and the valve opening power can be reduced. Further, an interlocking switching mechanism 36 provided on the first to third intake valve side rocker arms 33 to 35.
Are arranged coaxially with the rotating bodies 45 to 47, and constitute switching pins 68, 69,
The regulating member 70 and the return spring 71 are
Is inserted into the cylindrical shaft members 52 to 54 provided on the rocker arms 33 to 35 to support the rocker arms 33 to 35.
It is not necessary to apply them to the steps 35 to 35, which can contribute to a reduction in the number of processing steps.
【００３０】しかも点火プラグ７８を吸気弁１６，１６
側に配置することができるので，点火プラグ７８まわり
の熱引き性を向上することができ，最大トルクを発生さ
せる点火時期近傍に点火プラグ７８の点火時期を設定し
てもノッキングの発生を抑えることができ，したがって
充分な出力トルクを得ることができる。Further, the ignition plug 78 is connected to the intake valves 16 and 16.
Side, it is possible to improve the heat dissipation around the spark plug 78, and to suppress the occurrence of knocking even if the ignition timing of the spark plug 78 is set near the ignition timing at which the maximum torque is generated. Therefore, a sufficient output torque can be obtained.
【００３１】また吸気側を内方側に配置した車載用Ｖ型
内燃機関において，点火プラグ７８が吸気弁１６，１６
側に配置されることにより，点火プラグ７８の脱着のた
めのスペースをＶ型内燃機関の上方に確保すればよく，
点火プラグ７８の脱着のためのスペースを確保すること
が容易となる。In a vehicle-mounted V-type internal combustion engine in which the intake side is located on the inner side, the ignition plug 78 is connected to the intake valves 16, 16.
By arranging it on the side, a space for attaching and detaching the spark plug 78 may be secured above the V-type internal combustion engine.
It is easy to secure a space for attaching and detaching the spark plug 78.
【００３２】ところで，連動切換機構３６において，液
圧室７２に高圧の液圧を作用させたにもかかわらず，第
１および第２切換ピン６８，６９の連結作動が何らかの
原因により阻害され，連動切換機構３６が連動解除状態
のままとなる場合が考えられる。その場合，相互に独立
して作動する両吸気弁１６，１６のうち相対的に高リフ
トとなる吸気弁１６を駆動する第１吸気弁側ロッカアー
ム３３に，所定の高回転域まで動弁系挙動を保証するた
めに，弁ばね１９のばね荷重を第１吸気弁側ロッカアー
ム３３の重量に対応して比較的高く設定しておく必要が
ある。したがって第１吸気弁側ロッカアーム３３が比較
的大重量であれば，上記弁ばね１９のばね荷重もそれに
対応して大きく設定せねばならず，連動解除状態ならび
に連動状態での開弁動力が大きくなる。しかるに，相互
に独立して作動する両吸気弁１６，１６のうち相対的に
低リフトとなる吸気弁１６を駆動する第３吸気弁側ロッ
カアーム３５に液圧室７２および連通路７３が設けられ
ることにより，第１吸気弁側ロッカアーム３３は，液圧
室７２および連通路７３がない分だけ軽量化可能であ
り，したがって第１吸気弁側ロッカアーム３３を付勢す
るばね荷重を比較的低く設定して開弁動力の低減に寄与
することができる。By the way, in the interlocking switching mechanism 36, the connection operation of the first and second switching pins 68 and 69 is hindered by some cause, even though the high pressure is applied to the hydraulic chamber 72, and the interlocking operation is performed. It is conceivable that the switching mechanism 36 remains in the interlock release state. In this case, the first intake valve side rocker arm 33 that drives the intake valve 16 having a relatively high lift among the intake valves 16 that operate independently of each other is provided with a valve operating system behavior up to a predetermined high rotation range. Therefore, it is necessary to set the spring load of the valve spring 19 to be relatively high in accordance with the weight of the first intake valve side rocker arm 33. Therefore, if the first intake valve side rocker arm 33 is relatively heavy, the spring load of the valve spring 19 must be set correspondingly large, and the valve opening power in the interlocking release state and the interlocking state increases. . However, the hydraulic chamber 72 and the communication passage 73 are provided in the third intake valve side rocker arm 35 for driving the intake valve 16 having a relatively low lift among the intake valves 16, 16 that operate independently of each other. Accordingly, the first intake valve side rocker arm 33 can be reduced in weight by the absence of the hydraulic pressure chamber 72 and the communication passage 73. Therefore, the spring load for urging the first intake valve side rocker arm 33 is set relatively low. This can contribute to a reduction in valve opening power.
【００３３】また液圧室７２および連通路７３が設けら
れる第３吸気弁側ロッカアーム３５では，回転体４６の
軸方向長さ＞回転体４５の軸方向長さ＞回転体４７の軸
方向長さとなっているために，液圧室７２および連通路
７３を配設しても吸気弁側ロッカアームシャフト３７の
軸線に沿う幅を比較的小さく設定することが可能であ
り，それにより第３吸気弁側ロッカアーム３５の重量増
大を抑えて開弁動力低減に寄与することができるととも
に，カムシャフト２６の軸線に沿って動弁装置を比較的
コンパクトに構成することが可能となる。In the third intake valve side rocker arm 35 in which the hydraulic pressure chamber 72 and the communication passage 73 are provided, the axial length of the rotating body 46> the axial length of the rotating body 45> the axial length of the rotating body 47. Therefore, even if the hydraulic chamber 72 and the communication passage 73 are provided, the width of the rocker arm shaft 37 on the intake valve side along the axis can be set relatively small. The increase in the weight of the rocker arm 35 can be suppressed to contribute to the reduction of the valve opening power, and the valve operating device can be configured to be relatively compact along the axis of the camshaft 26.
【００３４】以上，本発明の実施例を詳述したが，本発
明は上記実施例に限定されるものではなく，特許請求の
範囲に記載された本発明を逸脱することなく種々の設計
変更を行なうことが可能である。Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.
【００３５】[0035]
【発明の効果】以上のように請求項１記載の発明によれ
ば，カムシャフトは，吸気側揺動支軸よりも下方に配設
され，連動切換機構は，吸気側揺動支軸から見て吸気弁
とは反対側に配置され，該連動切換機構は，隣接する吸
気弁駆動部材を連動させる位置ならびにその連動を解除
する位置間で移動可能な切換ピンと，切換ピンの移動を
案内すべく吸気弁駆動部材に固設される円筒状軸部材と
を備え，前記円筒状軸部材には，カムシャフトに設けら
れたカムに摺接する円筒状の回転体が回転自在に支承さ
れるので，各吸気弁駆動部材の吸気弁側の端部ないしは
その近くに連動切換機構を配設する必要はなくなり，従
って，吸気弁上端部の周辺において弁ばね支持用リテー
ナ等の部品を配置するスペースを連動切換機構に影響さ
れずに十分に確保可能となるから，相隣なる吸気弁駆動
部材相互間のリフト量の設定自由度を高めることがで
き，しかも吸気側揺動支軸よりも下方に配設されるカム
シャフトの上方スペースを有効に利用して連動切換機構
を無理なく配設できることから動弁機構の高さ方向の小
型化に寄与することができ，さらに吸気弁駆動部材の，
連動切換機構を保持する部分の肉厚（特に上下方向）も
十分に確保できるから該部材の変形防止に効果的であっ
て，該連動切換機構の切換作動の信頼性向上にも寄与す
ることができる。 As described above, according to the first aspect of the present invention, the cam shaft is disposed below the intake-side swing support shaft.
The interlocking switching mechanism is an intake valve viewed from the intake side pivot.
Is disposed on the side opposite to the, the interlock switching mechanism is set to the position and movable switching pin between a position for releasing the interlocking interlocking the intake valve driving member adjacent intake valve driving to guide the movement of the switching pin and a cylindrical shaft member which is fixed to member, wherein the cylindrical shaft member, since the cylindrical rotary member in sliding contact with a cam provided on the camshaft Ru is rotatably supported, each intake valve driving The end of the member on the intake valve side or
There is no need to install an interlocking switching mechanism near the
Therefore, the retainer for supporting the valve spring around the upper end of the intake valve
The space for placing parts such as
Since it is that Do sufficiently be secured without becomes the neighbors intake valve driving
The degree of freedom in setting the lift between members can be increased.
And a cam disposed below the intake-side swing support shaft
Interlocking switching mechanism that effectively utilizes the space above the shaft
Of the valve train in the height direction.
That can contribute to the molding,
The thickness of the part holding the interlocking switching mechanism (particularly in the vertical direction)
This is sufficient to prevent deformation of the member because it can be sufficiently secured.
This also contributes to improving the reliability of the switching operation of the interlocking switching mechanism.
Can be
【００３６】また請求項２記載の発明によれば，請求項
１記載の発明の前記効果に加えて，連動切換機構が連動
解除状態にあるときに吸気弁に対して自由となる特定の
吸気弁駆動部材をカム側に弾発付勢するロストモーショ
ン機構が，該特定の吸気弁駆動部材の，円筒状軸部材と
吸気側揺動支軸との中間部外面に当接しているので，該
中間部でロストモーション機構からの付勢力を直接受け
ることができ，従ってロストモーション機構に対する受
け座を該特定の吸気弁駆動部材の一端から特別に延設さ
せる必要はなくなり，それだけ該特定の吸気弁駆動部材
の構造簡素化と小型化が図られる。 According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the interlocking switching mechanism is interlocked.
Certain free to intake valves when in release state
Lost motion that urges the intake valve drive member toward the cam
The driving mechanism is configured such that the cylindrical shaft member of the specific intake valve driving member is
Because it is in contact with the outer surface of the intermediate part with the intake side pivot,
Directly receives the urging force from the lost motion mechanism in the middle
And therefore receive the lost motion mechanism.
A specially extended seat from one end of the particular intake valve drive member
The particular intake valve drive member
The structure is simplified and the size is reduced.
【図面の簡単な説明】[Brief description of the drawings]
【図１】Ｖ型内燃機関の側面図FIG. 1 is a side view of a V-type internal combustion engine.
【図２】図１の２−２線矢視拡大断面図FIG. 2 is an enlarged sectional view taken on line 2-2 of FIG. 1;
【図３】図２の３−３線断面図FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;
【図４】図２の４−４線断面図FIG. 4 is a sectional view taken along line 4-4 of FIG. 2;
【図５】図３の５−５線断面図FIG. 5 is a sectional view taken along line 5-5 in FIG. 3;
【符号の説明】 １６・・・・・・吸気弁 ２０・・・・・・排気弁 ２６・・・・・・カムシャフト ２９，３０，３１・・・・・・カム ３３，３４，３５・・・・・・吸気弁駆動部材としての
吸気弁側ロッカアーム ３６・・・・・・連動切換機構３７・・・・・・吸気側揺動支軸としての吸気弁側ロッ
カアームシャフト ３８・・・・・・排気弁駆動部材としての排気弁側ロッ
カアーム３９・・・・・・排気側揺動支軸としての排気弁側ロッ
カアームシャフト ４５，４６，４７・・・・・・回転体 ５２，５３，５４・・・・・・円筒状軸部材６２・・・・・・ロストモーション機構 ６８，６９・・・・・・切換ピン[Description of Signs] 16 ... intake valve 20 ... exhaust valve 26 ... camshaft 29, 30, 31 ... cam 33, 34, 35 ······ Intake valve side rocker arm as intake valve drive member 36 ···· Interlocked switching mechanism 37 ····· Intake valve side lock as intake side swing support shaft
Ca arm shaft 38 ...... exhaust valve side lock as an exhaust valve-side rocker arm 39 ...... exhaust side rocking shaft as an exhaust valve driving member
Car arm shafts 45, 46, 47 ... Rotating bodies 52, 53, 54 ... Cylindrical shaft members 62 ... Lost motion mechanisms 68, 69 ... Switching pin
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ０２Ｐ 13/00 ３０１ Ｆ０２Ｐ 13/00 ３０１Ｃ (72)発明者 藤吉 美広 埼玉県和光市中央１丁目４番１号 株式会 社本田技術研究所内 Ｆターム(参考） 3G018 AA07 AB02 BA13 BA36 CA09 CA19 CB02 CB06 DA14 DA28 GA07 GA17 3G019 AA05 KA14 3G024 AA04 AA13 AA18 DA01 DA09 DA19 FA14 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) F02P 13/00 301 F02P 13/00 301C (72) Inventor Mihiro Fujiyoshi 1-4-4 Chuo, Wako-shi, Saitama No. 1 F-term in Honda R & D Co., Ltd. (reference) 3G018 AA07 AB02 BA13 BA36 CA09 CA19 CB02 CB06 DA14 DA28 GA07 GA17 3G019 AA05 KA14 3G024 AA04 AA13 AA18 DA01 DA09 DA19 FA14
Claims (3)
弁（２０）に対して共通に単一のカムシャフト（２６）
が配設され，該カムシャフト（２６）と一対の吸気弁
（１６）との間には，連動および連動解除を切換可能な
連動切換機構（３６）を有する複数の吸気弁駆動部材
（３３，３４，３５）が揺動可能に配設され，前記カム
シャフト（２６）と一対の排気弁（２０）との間には，
各排気弁（２０）に個別に対応する一対の排気弁駆動部
材（３８）が揺動可能に配設される内燃機関のＳＯＨＣ
型動弁装置において，連動切換機構（３６）は，隣接す
る吸気弁駆動部材（３４，３５；３５，３４）を連動さ
せる位置ならびにその連動を解除する位置間で移動可能
な切換ピン（６８，６９）と，切換ピン（６８，６９）
の移動を案内すべく吸気弁駆動部材（３５，３４，３
３）に固設される円筒状軸部材（５４，５３，５２）と
を備え，前記円筒状軸部材（５４，５３，５２）には，
カムシャフト（２６）に設けられたカム（３１，２９，
３０）に摺接する円筒状の回転体（４７，４６，４５）
が回転自在に支承され，連動切換機構（３６）は吸気弁
駆動部材（３３，３４，３５）の揺動軸線に関して吸気
弁（１６）とは反対側に配置されることを特徴とする内
燃機関のＳＯＨＣ型動弁装置。1. A single camshaft (26) common to a pair of intake valves (16) and a pair of exhaust valves (20).
Is disposed between the camshaft (26) and the pair of intake valves (16). A plurality of intake valve driving members (33, 33) having an interlocking switching mechanism (36) capable of switching between interlocking and interlocking release. 34, 35) are arranged to be swingable, and between the camshaft (26) and the pair of exhaust valves (20),
SOHC of an internal combustion engine in which a pair of exhaust valve driving members (38) respectively corresponding to each exhaust valve (20) are swingably disposed.
In the valve actuating device of the type, the interlocking switching mechanism (36) is provided with a switching pin (68, 69) and switching pins (68, 69)
Valve drive members (35, 34, 3) to guide the movement of
3) a cylindrical shaft member (54, 53, 52) fixedly provided on the cylindrical shaft member (54, 53, 52).
The cams (31, 29,
30) A cylindrical rotating body (47, 46, 45) that comes into sliding contact with the rotating body.
Is rotatably supported, and the interlocking switching mechanism (36) is arranged on the side opposite to the intake valve (16) with respect to the swing axis of the intake valve drive member (33, 34, 35). SOHC type valve train.
ラグパイプ（７９）が両吸気弁（１６）間でシリンダヘ
ッド（９）に連設されることを特徴とする請求項１記載
の内燃機関のＳＯＨＣ型動弁装置。2. The internal combustion engine according to claim 1, wherein a plug pipe (79) for inserting a spark plug (78) is connected to the cylinder head (9) between the intake valves (16). SOHC type valve train for engine.
５）のうちの少なくとも１つ（３４）は，連動切換機構
（３６）が連動解除状態にあるときには吸気弁（１６）
に対して自由となるものであり，該吸気弁駆動部材（３
４）をカム（２９）側に弾発付勢するロストモーション
機構（６２）が吸気弁駆動部材（３４）の上方に配置さ
れることを特徴とする請求項１または２記載の内燃機関
のＳＯＨＣ型動弁装置。3. A plurality of intake valve driving members (33, 34, 3).
At least one of (5) is used for the intake valve (16) when the interlocking switching mechanism (36) is in the unlocked state.
To the intake valve drive member (3).
The SOHC of an internal combustion engine according to claim 1 or 2, wherein a lost motion mechanism (62) for urging the cam (29) toward the cam (29) is disposed above the intake valve drive member (34). Type valve train.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002000906A JP3923314B2 (en) | 2002-01-07 | 2002-01-07 | SOHC type valve gear for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002000906A JP3923314B2 (en) | 2002-01-07 | 2002-01-07 | SOHC type valve gear for internal combustion engine |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00578193A Division JP3319794B2 (en) | 1993-01-18 | 1993-01-18 | SOHC type valve train for internal combustion engine |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004344256A Division JP4381965B2 (en) | 2004-11-29 | 2004-11-29 | Internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002227624A true JP2002227624A (en) | 2002-08-14 |
| JP3923314B2 JP3923314B2 (en) | 2007-05-30 |
Family
ID=19190557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002000906A Expired - Fee Related JP3923314B2 (en) | 2002-01-07 | 2002-01-07 | SOHC type valve gear for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3923314B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7007646B2 (en) | 2003-09-18 | 2006-03-07 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Valve gear with cylinder suspending mechanism of an internal combustion engine |
| JPWO2005069355A1 (en) * | 2004-01-15 | 2007-12-27 | 株式会社ニコン | Exposure apparatus and device manufacturing method |
-
2002
- 2002-01-07 JP JP2002000906A patent/JP3923314B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7007646B2 (en) | 2003-09-18 | 2006-03-07 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Valve gear with cylinder suspending mechanism of an internal combustion engine |
| JPWO2005069355A1 (en) * | 2004-01-15 | 2007-12-27 | 株式会社ニコン | Exposure apparatus and device manufacturing method |
| JP2011077558A (en) * | 2004-01-15 | 2011-04-14 | Nikon Corp | Exposure apparatus and method, and method for manufacturing device |
| JP4710611B2 (en) * | 2004-01-15 | 2011-06-29 | 株式会社ニコン | Exposure apparatus, device manufacturing method, and exposure method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3923314B2 (en) | 2007-05-30 |
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