JPS61252816A - Tappet device for engine - Google Patents

Tappet device for engine

Info

Publication number
JPS61252816A
JPS61252816A JP9425885A JP9425885A JPS61252816A JP S61252816 A JPS61252816 A JP S61252816A JP 9425885 A JP9425885 A JP 9425885A JP 9425885 A JP9425885 A JP 9425885A JP S61252816 A JPS61252816 A JP S61252816A
Authority
JP
Japan
Prior art keywords
valve
intake
cam
speed
speed cam
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
Application number
JP9425885A
Other languages
Japanese (ja)
Other versions
JPH0641725B2 (en
Inventor
Hirobumi Nishimura
博文 西村
Hidetoshi Nobemoto
秀寿 延本
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.)
Mazda Motor Corp
Original Assignee
Mazda Motor Corp
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 Mazda Motor Corp filed Critical Mazda Motor Corp
Priority to JP9425885A priority Critical patent/JPH0641725B2/en
Publication of JPS61252816A publication Critical patent/JPS61252816A/en
Publication of JPH0641725B2 publication Critical patent/JPH0641725B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • 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
    • 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
    • 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
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • 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
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis

Landscapes

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

Abstract

PURPOSE:To optionally perform various kinds of intake control on a two-intake- valve engine, by changing over one intake valve between driven by a low speed cam and that by a high speed cam and another intake valve between drive and non-drive, and optionally combining the changeover of the former with that of the latter. CONSTITUTION:One intake valve of an engine having two intake valves for each cylinder can be optionally changed over between drive by a low speed cam and that by a high speed cam. When a valve 24 is opened by a controller 45, pressure oil is supplied into a cylinder 21 to move a selector 13 against a spring 22 to engage the small-diameter hole of the selector with the head of a plunger 14 to open and close the intake valve by the high speed cam. When a valve 44 is opened by the controller 45, pressure oil is supplied into a cylinder 41 to likewise move the selector 33 to drive a rocker arm 30 to open and close another intake valve. The opening and closing condition for the control valves 24, 44 can be optionally set to establish an optimal intake condition for each of various engines.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、運転状態に応じてバルブリフト特性を変える
ことのできる動弁装置に関し、特に吸気系もしくは排気
系の少なくとも一方に１気筒当り複数個のバルブを設け
たエンジンに適用される動弁装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a valve train capable of changing valve lift characteristics according to operating conditions, and in particular, the present invention relates to a valve train capable of changing valve lift characteristics according to operating conditions. The present invention relates to a valve train applied to an engine provided with several valves.

（従来技術） エンジンの吸、排気パルプの作動特性を設定する場合に
、低速時にはパルプオーバーラツプ期間における排気の
吹返しゃ吸気の吹抜けを抑制する等により燃焼の安定性
および燃費の向上を図るため、バルブリフト量および開
弁期間を比較的小さくすることが望ましく、高速時には
出力の向上等のためバルブリフト量や開弁期間を大きく
することが望ましい。(Prior art) When setting the operating characteristics of the engine's intake and exhaust pulp, at low speeds, combustion stability and fuel efficiency are improved by suppressing exhaust blowback and intake air blow-through during the pulp overlap period at low speeds. Therefore, it is desirable to make the valve lift amount and the valve opening period relatively small, and at high speeds, it is desirable to increase the valve lift amount and the valve opening period in order to improve the output.

このような要求を満足するため、形状の異なる２種のカ
ムを設け、これらのカムのいずれかに選択的にバルブを
連係させ、かつその連係を運転状態に応じて切替えるよ
うにした動弁装置は従来においても知られており、この
種の動弁装置としては、例えば実開昭５７−１８２２０
５号公報に示されているようなものがある。この装置は
、１個のバルブに対して低速型と高速型の２個のカムと
１個のロッカーアームとを有し、Ｏツカ−アームのカム
側部分を２又状に形成してその一方の端部を低速型カム
への当接部とするとともに、他方の端部に摺動可能な高
速カム当接部材およびその摺動を阻止するストッパを装
備し、このストッパを油圧シリンダ等の７クチユエータ
により連動機構を介して作動するようにしている。そし
て上記アクチュエータを運転状態に応じて副部すること
により、低速時には上記高速カム当接部材が遊動して高
速型カムの作動がパルプに伝達されず低速型カムでパル
プが作動され、高速時には上記高速カム当接部材の摺動
が阻止されて高速型カムの作動がパルプに伝達されるよ
うにしている。In order to satisfy such requirements, a valve train is provided with two types of cams with different shapes, a valve is selectively linked to one of these cams, and the linkage is switched depending on the operating state. is known in the past, and this type of valve train is known, for example, from Utility Model Application No. 57-18220.
There is something like the one shown in Publication No. 5. This device has two cams, a low-speed type and a high-speed type, and one rocker arm for one valve, and the cam side part of the O-tsuka arm is formed into a bifurcated shape, and one of the cams is connected to the other side. The end of the cam is abutting part for the low-speed cam, and the other end is equipped with a slidable high-speed cam abutting member and a stopper that prevents the sliding. The actuator is operated via an interlocking mechanism. By configuring the actuator as a sub-section depending on the operating condition, the high-speed cam abutting member moves freely at low speeds and the operation of the high-speed cam is not transmitted to the pulp, and the pulp is actuated by the low-speed cam, and at high speeds, the Sliding of the high-speed cam abutting member is prevented so that the operation of the high-speed cam is transmitted to the pulp.

ところで、上記従来装置は、吸気系もしくは排気系のパ
ルプが１気筒につき１個設けられたエンジンにおいて、
この１気筒につき１個のパルプのリフト特性を運転状態
に応じて変えるようにしているにすぎず、吸気バルブ、
排気パルプの双方もしくはいずれか一方が１気筒につき
複数個設けられたエンジンには適用されていなかった。By the way, the above-mentioned conventional device is applicable to an engine in which one pulp per cylinder is provided for the intake system or the exhaust system.
The lift characteristics of one pulp per cylinder are simply changed according to the operating conditions, and the intake valve,
This method has not been applied to engines in which one or both of the exhaust pulps are provided in plural pieces per cylinder.

そしてこのような従来装置によると、単に低速時と高速
時とで１個のパルプのリフト特性を変えるだけなので、
低、中、高速域等に応じた吸、排気条件、吸気スワール
の多様な調整等を行うことができなかった。According to such conventional equipment, the lift characteristics of one piece of pulp are simply changed between low speed and high speed.
It was not possible to make various adjustments to intake and exhaust conditions and intake swirl according to low, medium, and high speed ranges.

（発明の目的） 本発明はこのような事情に鑑み、吸気系もしくは排気系
の少なくとも一方に、１気筒当り複数個のパルプを設け
たエンジンにおいて、上記複数個のパルプの作動および
リフト特性を低、中、高速域等の種々の運転状態に応じ
て調整することができ、吸、排気条件や吸気スワールを
各運転状態に適合させることができるエンジンの動弁装
置を提供するものである。(Object of the Invention) In view of the above circumstances, the present invention provides an engine in which a plurality of pulps are provided per cylinder in at least one of the intake system or the exhaust system, in which the operation and lift characteristics of the plurality of pulps are reduced. The present invention provides an engine valve operating system that can be adjusted according to various operating conditions such as , medium, and high speed ranges, and can adapt intake and exhaust conditions and intake swirl to each operating condition.

（発明の構成） 本発明は、吸気系もしくは排気系の少なくとも一方に、
１気筒当り複数個のパルプを設けたエンジンにおいて、
これらのパルプに対し、異なる形状のものを含む複数個
のカムと、別個のパルプをそれぞれカムの作動に応じて
駆動する互いに独立した少なくとも２系統の伝達機構と
を備え、その一方の伝達機構に、形状が異なるカムにパ
ルプを選択的に連係してその連係を運転状態に応じて切
替える連係切替機構を設けるとともに、他方の伝゛　　
　速機構に、特定運転域でカムとパルプとの連係を遮断
してパルプを停止させる停止機構を設けたものである。(Structure of the Invention) The present invention provides at least one of the intake system and the exhaust system,
In an engine with multiple pulps per cylinder,
For these pulps, it is equipped with a plurality of cams including those of different shapes and at least two systems of transmission mechanisms independent of each other that drive separate pulps according to the operation of the cams, and one of the transmission mechanisms is In addition to providing a linkage switching mechanism that selectively links pulp to cams of different shapes and switches the linkage depending on the operating condition,
The speed mechanism is equipped with a stop mechanism that stops the pulp by cutting off the connection between the cam and the pulp in a specific operating range.

つまり、上記の１気筒当りの複数個のパルプのうちの一
部のパルプについては運転状態に応じてバルブリフト特
性を変化させ、他のパルプについては停止状態と作動状
態とに切替可能とし、このような一部のパルプのリフト
特性の切替えと他のパルプの停止、作動の切替えとの組
合わせにより、吸、排気条件、吸気スワール等を運転状
態に応じて調整するようにしたものである。In other words, the valve lift characteristics of some of the plurality of pulps per cylinder are changed according to the operating state, and the valve lift characteristics of other pulps can be switched between the stopped state and the operating state. By a combination of switching the lift characteristics of some pulps and switching the stoppage and operation of other pulps, intake and exhaust conditions, intake swirl, etc. are adjusted according to the operating state.

（実施例） 第１図乃至第４図は本発明の一実施例を示し、図では吸
気バルブに適用した場合を示しており、これらの図にお
いて１はシリンダヘッド、２は気筒であり、この気筒２
には複数個（図では２個）の吸気バルブ３．４が装備さ
れている。気筒２には排気バルブも装備されるが、排気
バルブおよびその駆動系については図示を省略している
。上記両吸気バルブ３．４に対しては、カムシャフト５
に配設された複数個のカム６．７．８と、ロッカーシャ
フト９に支承された別個のロッカーアーム１０．３０か
らなる独立した２系統の伝達機構とで駆動系が構成され
ている。上記複数個のカムは、一方の吸気パルプ３に対
して設けられた低速型と高速型の２個のカム６．７と、
他方の吸気バルブ４に対して設けられた１個のカム８と
からなっている。゛ 上記一方の吸気バルブ３に対して設けられた低速型カム
６と高速型カム７とは異なる形状に形成され、つまり低
速型カム６はバルブリフト量および開弁期間を比較的小
さくするようにカムノーズが小さく形成されており、高
速型カム７はバルブリフト量、開弁期間の少なくとも一
方を低速型カム６よりも大きくするようにカムノーズが
大きく形成されている。また他方の吸気バルブ４に対し
て設けられたカム８は、上記高速型カム７と同程度にカ
ムノーズが大きく形成されている。そして、上記一方の
吸気バルブ３とこれに対する２個のカム６．７との間に
配置されて一方の伝達機構を構成するロッカーアーム１
０には、吸気バルブ３を低速型カム６に連係する状態と
高速型カム７に連係する状態とに切替える連係切替機構
が設けられている。また、他方の吸気バルブ４とこれに
対するカム８との間の伝達機構を構成するロッカーアー
ム３０には、特定の運転域で吸気バルブ４を停止させる
停止機構が設けられている。(Example) Figures 1 to 4 show an example of the present invention, and the figures show the case where it is applied to an intake valve. In these figures, 1 is a cylinder head, 2 is a cylinder, and this cylinder 2
is equipped with a plurality of (two in the figure) intake valves 3.4. The cylinder 2 is also equipped with an exhaust valve, but the exhaust valve and its drive system are not shown. For both intake valves 3.4 above, the camshaft 5.
A drive system is constituted by two independent transmission mechanisms consisting of a plurality of cams 6.7.8 disposed on the rocker shaft 9 and a separate rocker arm 10.30 supported on the rocker shaft 9. The plurality of cams include two cams 6.7 of a low speed type and a high speed type provided for one intake pulp 3,
One cam 8 is provided for the other intake valve 4.゛The low-speed cam 6 and the high-speed cam 7 provided for one of the intake valves 3 are formed in different shapes, that is, the low-speed cam 6 is designed to have a relatively small valve lift amount and valve opening period. The cam nose is formed small, and the cam nose is formed large so that the high-speed cam 7 has at least one of the valve lift amount and the valve opening period larger than the low-speed cam 6. The cam 8 provided for the other intake valve 4 has a cam nose as large as that of the high-speed cam 7. A rocker arm 1 is disposed between one of the intake valves 3 and two cams 6.7 corresponding thereto, and constitutes one of the transmission mechanisms.
0 is provided with a linkage switching mechanism that switches the intake valve 3 between a state in which it is linked with the low-speed type cam 6 and a state in which it is linked with the high-speed type cam 7. Further, the rocker arm 30 that constitutes a transmission mechanism between the other intake valve 4 and the cam 8 thereto is provided with a stop mechanism that stops the intake valve 4 in a specific operating range.

上記一方のロッカーアーム１０に設けられた連係切替機
構は、このロッカーアーム１０を高速型カム７への当接
部を有する第１アーム１１と吸気バルブ３および低速型
カム６への当接部を有する第２アーム１２とに分割し、
この両アーム１１゜１２をロッカーシャフト９回りに相
対運動可能とするとともに、この両アーム１１．１２を
接続状態と非接続状態とに切替えるセレクタ１３を設け
ることにより構成されている。The linkage switching mechanism provided on one of the rocker arms 10 connects the rocker arm 10 to a first arm 11 having a contact portion for the high-speed cam 7 and a contact portion for the intake valve 3 and the low-speed cam 6. a second arm 12 having
Both arms 11 and 12 can be moved relative to each other around the rocker shaft 9, and a selector 13 is provided to switch the arms 11 and 12 between a connected state and a non-connected state.

上記セレクタ１３はプランジャ１４およびレバ一部材１
５を備え、上記第１アーム１１に組込まれており、具体
的には次のような構造となっている。すなわち、第１ア
ーム１１の上部には第２アーム１２の上部に向かって開
口するガイド孔１６が形成され、このガイド孔１６に上
記プランジャ１４が移動可能に収容され、このプランジ
ャ１４はガイド孔１６内のスプリング１７によって第２
アーム１２に当接するように付勢されており、プランジ
ャ１４の途中部には小径の係合部１８が形成されている
。また、第１アーム１１の上部には、上記レバ一部材１
５がプランジャ１４に直交してロッカーシャフト９の軸
方向に移動可能に支承されており、このレバ一部材１５
には、プランジャ１４より若干大径のプランジャ挿通孔
１９と上記係合部１８に対応する大きさで上記プランジ
ャ挿通孔１９に連なった係止孔２０とが形成されている
。上記レバ一部材１５の端部はロッカーシャフト９の周
囲に設けられた環状の油圧式のアクチュエータ２１にレ
バ一部材１５のアーム１５ａを介して連結されており、
このアクチュエータ２１にオイルが供給されたときには
レバ一部材１５が後記ロック位置に向けて作動され、ア
クチュエータ２１からオイルがリリーフされたときはリ
ターンスプリング２２によりレバ一部材１５が後記非ロ
ツク位置に向けて作動されるようになっている。The selector 13 includes a plunger 14 and a lever member 1.
5, which is incorporated into the first arm 11, and specifically has the following structure. That is, a guide hole 16 that opens toward the top of the second arm 12 is formed in the upper part of the first arm 11, and the plunger 14 is movably accommodated in this guide hole 16. The second
The plunger 14 is biased so as to come into contact with the arm 12, and a small diameter engagement portion 18 is formed in the middle of the plunger 14. Further, the lever member 1 is provided on the upper part of the first arm 11.
5 is supported perpendicularly to the plunger 14 so as to be movable in the axial direction of the rocker shaft 9, and this lever member 15
A plunger insertion hole 19 having a diameter slightly larger than that of the plunger 14 and a locking hole 20 connected to the plunger insertion hole 19 and having a size corresponding to the engaging portion 18 are formed in the plunger insertion hole 19 . The end of the lever member 15 is connected to an annular hydraulic actuator 21 provided around the rocker shaft 9 via an arm 15a of the lever member 15.
When oil is supplied to this actuator 21, the lever member 15 is operated toward the lock position described later, and when oil is relieved from the actuator 21, the lever member 15 is operated toward the unlock position described later by the return spring 22. It is now activated.

こうして、上記レバ一部材１５の係止孔２０がプランジ
ャ１４の保合部１８から離脱してプランジャ挿通孔１９
にプランジャ１４が挿通される非ロツク位置にレバ一部
材１５があるときは、プランジャ１４の摺動が許容され
ることにより両アーム１１．１２の相対運動が許容され
（このときが非接続状態）、他方、係止孔２０が係合部
１８に係合するロック位置にレバ一部材１５が作動され
たときは、プランジャ１４の摺動が阻止されることによ
り、両アーム１１．１２の上部が互いに接近する方向の
相対運動が阻止されるようにしている（このときが接続
状態）。そして、上記両アーム１１．１２が非接続状態
となったときは一方の吸気バルブ３が低速型カム６に連
係され、つまり高速型カム７の回転に伴う第１アーム１
１の揺動が第２アーム１２に伝達されないため低速型カ
ム６０回転に応じた第２アーム１２の揺動により吸気バ
ルブ３が作動される状態となり、また両アーム１１．１
２が接続状態となったときは上記一方の吸気バルブ３が
高速型カム７に連係され、つまり高速型カム７の回転に
応じた両アーム１１．１２の一体的な揺動により吸気バ
ルブ３が作動される状態となる。In this way, the locking hole 20 of the lever member 15 separates from the retaining portion 18 of the plunger 14, and the plunger insertion hole 19
When the lever member 15 is in the unlocked position where the plunger 14 is inserted, sliding of the plunger 14 is allowed and relative movement of both arms 11 and 12 is allowed (this is a disconnected state). On the other hand, when the lever member 15 is operated to the lock position where the locking hole 20 engages with the engaging portion 18, the sliding of the plunger 14 is prevented, so that the upper portions of both arms 11 and 12 are Relative movement in the direction of approaching each other is prevented (this is the connected state). When both the arms 11 and 12 are disconnected, one of the intake valves 3 is linked to the low-speed cam 6, that is, the first arm 1 is connected to the low-speed cam 6 as the high-speed cam 7 rotates.
1 is not transmitted to the second arm 12, the intake valve 3 is actuated by the swing of the second arm 12 in response to the rotation of the low-speed cam 60, and both arms 11.1
2 is in the connected state, one of the intake valves 3 is linked to the high-speed cam 7, that is, the intake valve 3 is moved by the integral rocking of both arms 11 and 12 in response to the rotation of the high-speed cam 7. It will be activated.

また、他方のロッカーアーム３０に設けられた停止機構
は、このロッカーアーム３０をカム８に当接するカム側
アーム３１と上記他方の吸気バルブ４に当接するバルブ
側アーム３２とに分割し、この両アーム３１．３２をロ
ッカーシャフト９回りに相対運動可能とするとともに、
この両アーム３１．３２を接続状態と非接続状態とに切
替えるセレクタ３３を設けることにより構成されている
。The stop mechanism provided on the other rocker arm 30 divides the rocker arm 30 into a cam-side arm 31 that contacts the cam 8 and a valve-side arm 32 that contacts the other intake valve 4. While allowing the arms 31 and 32 to move relative to each other around the rocker shaft 9,
It is constructed by providing a selector 33 that switches both arms 31 and 32 between a connected state and a non-connected state.

上記セレクタ３３も連係機構のセレクタ１３とほぼ同様
に、カム側アーム３１の上部に移動可能に装備されてス
プリング３７によりパルプ側アーム３２に当接するよう
に付勢されたプランジャ３４と、油圧式等のアクチュエ
ータ４１およびリターンスプリング４２等により作動さ
れてロッカーシャフト９の軸方向に揺動することにより
プランジャ３４に対し係脱するレバ一部材３５とを備え
、このプランジャ３４に対するレバ一部材３５の係脱に
よって上記両アーム３１．３２が接続状態と非接続状態
とに切替えられるようになっている。The selector 33 is similar to the selector 13 of the linkage mechanism, and includes a plunger 34 that is movably mounted on the upper part of the cam side arm 31 and is biased by a spring 37 so as to come into contact with the pulp side arm 32, and a hydraulic type etc. The lever member 35 is actuated by an actuator 41 and a return spring 42 to swing in the axial direction of the rocker shaft 9 to engage and disengage from the plunger 34. The arms 31 and 32 can be switched between a connected state and a non-connected state.

そしてこの他方のロッカーアーム３０においては、バル
ブ側アーム３２がカムへの当接部分を有しないため、上
記非接続状態となれば吸気バルブ４を停止させ、上記接
続状態となればカム８の回転に応じて吸気バルブ４を作
動させることとなる。In this other rocker arm 30, since the valve-side arm 32 does not have a part that comes into contact with the cam, the intake valve 4 is stopped when the above-mentioned disconnected state is reached, and the rotation of the cam 8 when the above-mentioned connected state is entered. The intake valve 4 is operated accordingly.

連係切替機構および停止機構の各セレクタ１３゜３３は
、それぞれのアクチュエータ２１．４１に対するオイル
通路２３．４３中に設けられてオイルの供給、排出を制
御する制御バルブ２４．４４と、回転数信号４６等を受
けて上記各制御バルブ２４．４４を制御する制御回路４
５とにより、運転状態に応じて制御されるようになって
いる。これによって、例えば一方の吸気バルブ３は低速
域では高速型カム７に連係されて高速域では低速型カム
６に連係され、また他方の吸気バルブ４は低速側の特定
運転域で停止される。Each selector 13.33 of the linkage switching mechanism and stop mechanism has a control valve 24.44 provided in the oil passage 23.43 for each actuator 21.41 to control oil supply and discharge, and a rotation speed signal 46. A control circuit 4 that controls each of the control valves 24 and 44 in response to
5, it is controlled according to the operating state. As a result, for example, one intake valve 3 is linked to the high-speed cam 7 in a low-speed range, and linked to the low-speed cam 6 in a high-speed range, and the other intake valve 4 is stopped in a specific operating range on the low-speed side.

なお、２５．２６は一方のロッカーアーム１０の第２ア
ーム１２に配設されたバルブクリアランス調整用のアジ
ャスタであり、また、２５′は他方のロッカーアーム３
０に設けられたバルブクリアランス調整用のアジャスタ
である。Note that 25 and 26 are adjusters for adjusting valve clearance disposed on the second arm 12 of one rocker arm 10, and 25' is an adjuster for adjusting the valve clearance provided on the second arm 12 of one rocker arm 10.
This is an adjuster for adjusting valve clearance provided at 0.

この動弁装置によると、運転状態に応じ、一方の吸気バ
ルブ３がロッカーアーム１０に装備された連係切替機構
によって低速型カム６で作動される状態と高速型カム７
で作動される状態とに切替えられることにより、この一
方の吸気バルブ３めリフト特性が変化し、さらに他方の
吸気バルブ４が停止機構によって停止状態と作動状態と
に切替えられることにより、一方の吸気バルブ３のみか
ら吸気が導入される状態と両吸気バルブ３，４から吸気
が導入される状態とにも変化する。そして、連係切替機
構を備えたロッカーアーム１０と停止機構を備えたロッ
カーアーム３０が互いに独立しているので、それぞれに
おける連係の切替回転数および停止、作動の切替回転数
を個別に設定しておくことができ、これによって低速、
中速、高速等の各運転域に適合するように吸気条件を調
整することが可能となる。According to this valve train, one intake valve 3 is operated by the low-speed cam 6 and the other is operated by the high-speed cam 7 by a linkage switching mechanism provided on the rocker arm 10, depending on the operating state.
By switching to the operated state, the third lift characteristic of this one intake valve changes, and furthermore, by switching the other intake valve 4 between the stopped state and the operating state by the stop mechanism, one intake valve 4 changes. There are also changes between a state in which intake air is introduced only from valve 3 and a state in which intake air is introduced from both intake valves 3 and 4. Since the rocker arm 10 with the linkage switching mechanism and the rocker arm 30 with the stop mechanism are independent from each other, the linkage switching speed and stop/operation switching speed for each are set separately. This allows for lower speeds,
It becomes possible to adjust the intake conditions to suit each driving range such as medium speed and high speed.

つまり、例えば一方の吸気バルブ３に対しては比較的低
い回転数を境にして低速型カム６で作動される状態と高
速型カム７で作動される状態とに連係が切替えられ、他
方の吸気バルブ４に対しては比較的高い回転数を境にし
て停止状態と作動状態とに切替えられる設定としておけ
ば、低速域では一方の吸気バルブ３のみが小さなリフト
量、開弁期間をもって作動し、中速域ではやはり一方の
吸気バルブ３のみが作動するものの、そのリフト量、開
弁期間が大きくなり、高速域では両吸気バルブ３．４が
大きなリフト量、開弁期間をもって作動することとなる
。あるいはまた、一方の吸気バルブ３に対しては比較的
高い回転数を境にして連係が切替えられ、他方の吸気バ
ルブ４に対しては比較的低い回転数を境に停止、作動が
切替えられる設定としておけば、低速域、高速域では上
記と同様の吸気条件が与えられるが、中速域では一方の
吸気バルブ３が小さなリフト量、開弁期間をもって作動
されるとともに他方の吸気バルブ４が大きなリフト量、
開弁期間をもって作動されることとなる。That is, for example, the linkage of one intake valve 3 is switched between a state in which it is operated by the low-speed cam 6 and a state in which it is operated by the high-speed cam 7 at a relatively low rotational speed, and the other intake valve 3 is operated at a relatively low rotation speed. If the valve 4 is set to be switched between a stopped state and an operating state at a relatively high rotational speed, only one intake valve 3 will operate with a small lift amount and an open period in a low speed range. In the medium speed range, only one intake valve 3 operates, but its lift amount and valve opening period become large, and in the high speed range, both intake valves 3.4 operate with a large lift amount and valve opening period. . Alternatively, the linkage may be switched for one intake valve 3 at a relatively high rotation speed, and the linkage may be switched between stopping and operating for the other intake valve 4 at a relatively low rotation speed. In this case, the same intake conditions as above are given in the low speed range and high speed range, but in the middle speed range, one intake valve 3 is operated with a small lift amount and a valve opening period, and the other intake valve 4 is operated with a large lift amount and valve opening period. lift amount,
It will be activated during the valve opening period.

このようにすることにより、低速域では吸気スワールを
与えつつ排気の吹返しゃ吸気の吹戻り等を防止し、中速
域では吸気スワールを与えつつ比　　　′較的多量の吸
気導入を許容し、高速域ではさらに多量の吸気導入を許
容して充填量を増大させるというような調整が可能とな
り、全運転域に亘って燃焼性、トルク等を高めることが
できる。By doing this, in the low speed range, it is possible to provide an intake swirl while preventing the exhaust air from blowing back, and in the middle speed range, it is possible to provide an intake swirl while allowing a relatively large amount of intake air to be introduced. In the high-speed range, it is possible to make adjustments such as allowing a larger amount of intake air to be introduced and increasing the charging amount, thereby improving combustibility, torque, etc. over the entire operating range.

なお、この動弁装置の一方の伝達機構に設けられる連係
切替機構の具体的構造は上記実施例に限定されず、種々
変換可能である。例えば第５図および第６図に示すよう
に、ロッカーシャフト９の外周にプランジャ５１を摺動
自在に配置してこのプランジャ５１に係止片５２を連成
し、この係止片５２を第１アーム１１の内周面に設けた
保合用凹部５３に係合させ、かつプランジャ５１の摺動
に伴ってこの係止片５２が第２アーム１２の内周面に設
けた係合用凹部５４に対して係脱可能となるようにし、
油圧式のアクチュエータ５５およびリターンスプリング
５６等で上記プランジャ５１をロッカーシャフト９の軸
方向に摺動させることにより、上記両アーム１１．１２
を接続状態と非接続状態とに切替えるようにしてもよい
。あるいはロッカーアーム１０を一体化し、その代りに
、ロッカーアーム１０の高速型カム７に当接する端部に
摺動可能なプランジャおよびこれに係脱するストッパ部
材を装備することにより、この端部で高速型カム７の作
動の吸収、伝達を可能とする構造としてもよい（この具
体構造は図示省略）。また、停止機構についても同様に
具体構造は種々変更可能である。Note that the specific structure of the linkage switching mechanism provided in one transmission mechanism of this valve train is not limited to the above embodiment, and can be modified in various ways. For example, as shown in FIGS. 5 and 6, a plunger 51 is slidably disposed on the outer periphery of the rocker shaft 9, a locking piece 52 is connected to the plunger 51, and this locking piece 52 is connected to a first The locking piece 52 is engaged with the locking recess 53 provided on the inner circumferential surface of the arm 11, and as the plunger 51 slides, the locking piece 52 engages with the locking recess 54 provided on the inner circumferential surface of the second arm 12. so that it can be connected and disconnected by
By sliding the plunger 51 in the axial direction of the rocker shaft 9 using a hydraulic actuator 55, a return spring 56, etc., both the arms 11, 12
may be switched between a connected state and a non-connected state. Alternatively, the rocker arm 10 may be integrated, and instead, the end of the rocker arm 10 that abuts the high-speed cam 7 may be equipped with a slidable plunger and a stopper member that engages and disengages with the plunger. It may also have a structure that allows absorption and transmission of the operation of the mold cam 7 (this specific structure is not shown). Similarly, the specific structure of the stopping mechanism can be changed in various ways.

また、上記実施例では吸気バルブに適用した場合を示し
たが、本発明は、排気バルブが１気筒当り複数個設けら
れているエンジンにおいて、その複数個の排気バルブに
適用してもよく、この場合も、排気バルブのリフト特性
の調整によってバルブオーバーラツプ量等を調整でき、
また、一方の排気バルブを停止すれば気筒内にスワール
が生じるので、燃焼性やトルク等の調整を行うことがで
きる。吸気バルブもしくは排気バルブが１気筒当り３個
以上設けられる場合でも、少なくとも２系統の独立した
伝達機構に連係切替機構および停止機構を設けることに
よって適用できる。Furthermore, although the above embodiments show the case where the present invention is applied to an intake valve, the present invention may also be applied to a plurality of exhaust valves in an engine in which a plurality of exhaust valves are provided per cylinder. In this case, the amount of valve overlap etc. can be adjusted by adjusting the lift characteristics of the exhaust valve.
Further, if one exhaust valve is stopped, a swirl is generated within the cylinder, so combustion performance, torque, etc. can be adjusted. Even when three or more intake valves or exhaust valves are provided per cylinder, the present invention can be applied by providing at least two independent transmission mechanisms with a linkage switching mechanism and a stop mechanism.

（発明の効果） 以上のように本発明は、１気筒当り複数個の吸気バルブ
もしくは排気バルブに対し、互いに独立した少なくとも
２系統の伝達機構を備え、その一方に、形状が異なるカ
ムとバルブとの間で連係を切替える連係切替機構を設け
るとともに、他方にバルブの停止機構を設けているので
一部のバルブに対する上記連係の切替えによるバルブリ
フト量の調整と、他のバルブの停止、作動とを運転状態
に応じた組合わせで行うことにより、吸気スワール、バ
ルブオーバーラツプ量等を各種運転域に適合するように
調整することができる。このため、低速、中速、高速等
の各運転域で、燃費や燃焼性、出力等を向上することが
できるものである。(Effects of the Invention) As described above, the present invention includes at least two transmission mechanisms independent of each other for a plurality of intake valves or exhaust valves per cylinder, and one of the transmission mechanisms has a cam and a valve having different shapes. A linkage switching mechanism is provided to switch the linkage between the valves, and a valve stop mechanism is provided on the other side, so that the valve lift amount can be adjusted by switching the linkage for some valves, and the other valves can be stopped or activated. By performing combinations according to operating conditions, intake swirl, valve overlap amount, etc. can be adjusted to suit various operating ranges. Therefore, it is possible to improve fuel efficiency, combustibility, output, etc. in each driving range such as low speed, medium speed, and high speed.

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

第１図は本発明装置の一実施例を示す平面図、第２図は
第１図のＩＦ−ＩＦ線に沿った断面図、第３図は第１図
の■−■線に沿った断面図、第４図はロッカーシャフト
位置での縦断正面図、第５図は別の実施例を示す分解斜
視図、第６図はこの実施例装置のロッカーシャフト位置
での縦断正面図である。 ３．４・・・吸気バルブ、６．７．８・・・カム、ｉｏ
。 ３０・・・ロッカーアーム（伝達機構）、１３・・・セ
レクタ（連係切替機構）、３３−・・セレクタ（停止機
構）。 特許出願人　　　　マ　ツ　ダ　株式会社代　理　人　
　　　弁理士　　　小谷悦司同　　　　　　弁理士　　
　長１）正 向　　　　　　弁理士　　　板谷康夫 第　　１　　図 ＩＩｈ　　Ｉ［−Ｉ 第　　２　　図 第　　３　　図 第　　５　　図 第　　６　　図Fig. 1 is a plan view showing an embodiment of the device of the present invention, Fig. 2 is a sectional view taken along the IF-IF line in Fig. 1, and Fig. 3 is a sectional view taken along the ■-■ line in Fig. 1. 4 is a longitudinal sectional front view at the rocker shaft position, FIG. 5 is an exploded perspective view showing another embodiment, and FIG. 6 is a longitudinal sectional front view of the apparatus of this embodiment at the rocker shaft position. 3.4...Intake valve, 6.7.8...Cam, io
. 30... Rocker arm (transmission mechanism), 13... Selector (coupling switching mechanism), 33-... Selector (stopping mechanism). Patent applicant Mazda Co., Ltd. Agent
Patent Attorney Etsushi Kotani Patent Attorney
Long 1) Masamukai Patent Attorney Yasuo Itaya No. 1 Fig. IIh I [-I Fig. 2 Fig. 3 Fig. 5 Fig. 6

Claims (1)

【特許請求の範囲】[Claims] １、吸気系もしくは排気系の少なくとも一方に、１気筒
当り複数個のバルブを設けたエンジンにおいて、これら
のバルブに対し、異なる形状のものを含む複数個のカム
と、別個のバルブをそれぞれカムの作動に応じて駆動す
る互いに独立した少なくとも２系統の伝達機構とを備え
、その一方の伝達機構に、形状が異なるカムにバルブを
選択的に連係してその連係を運転状態に応じて切替える
連係切替機構を設けるとともに、他方の伝達機構に、特
定運転域でカムとバルブとの連係を遮断してバルブを停
止させる停止機構を設けたことを特徴とするエンジンの
動弁装置。1. In an engine with multiple valves per cylinder in at least one of the intake system or exhaust system, multiple cams, including those of different shapes, and separate valves are installed for each of these valves. A linkage switching system that is equipped with at least two transmission mechanisms that are independent of each other and that are driven according to the operation, and one of the transmission mechanisms selectively links valves to cams of different shapes and switches the linkage depending on the operating state. What is claimed is: 1. A valve train for an engine, comprising: a stop mechanism for stopping the valve by interrupting the connection between the cam and the valve in a specific operating range;
JP9425885A 1985-04-30 1985-04-30 Engine valve gear Expired - Fee Related JPH0641725B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9425885A JPH0641725B2 (en) 1985-04-30 1985-04-30 Engine valve gear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9425885A JPH0641725B2 (en) 1985-04-30 1985-04-30 Engine valve gear

Publications (2)

Publication Number Publication Date
JPS61252816A true JPS61252816A (en) 1986-11-10
JPH0641725B2 JPH0641725B2 (en) 1994-06-01

Family

ID=14105259

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9425885A Expired - Fee Related JPH0641725B2 (en) 1985-04-30 1985-04-30 Engine valve gear

Country Status (1)

Country Link
JP (1) JPH0641725B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015224638A (en) * 2014-05-23 2015-12-14 ジェイコブス ビークル システムズ、インコーポレイテッド Auxiliary valve motions employing disablement of main valve events and/or coupling of adjacent rocker arms
US9790824B2 (en) 2010-07-27 2017-10-17 Jacobs Vehicle Systems, Inc. Lost motion valve actuation systems with locking elements including wedge locking elements
US10851717B2 (en) 2010-07-27 2020-12-01 Jacobs Vehicle Systems, Inc. Combined engine braking and positive power engine lost motion valve actuation system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9790824B2 (en) 2010-07-27 2017-10-17 Jacobs Vehicle Systems, Inc. Lost motion valve actuation systems with locking elements including wedge locking elements
US10851717B2 (en) 2010-07-27 2020-12-01 Jacobs Vehicle Systems, Inc. Combined engine braking and positive power engine lost motion valve actuation system
JP2015224638A (en) * 2014-05-23 2015-12-14 ジェイコブス ビークル システムズ、インコーポレイテッド Auxiliary valve motions employing disablement of main valve events and/or coupling of adjacent rocker arms

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Publication number Publication date
JPH0641725B2 (en) 1994-06-01

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