JPS60228715A - Variable device of valve lift in four-cycle engine - Google Patents

Variable device of valve lift in four-cycle engine

Info

Publication number
JPS60228715A
JPS60228715A JP8408884A JP8408884A JPS60228715A JP S60228715 A JPS60228715 A JP S60228715A JP 8408884 A JP8408884 A JP 8408884A JP 8408884 A JP8408884 A JP 8408884A JP S60228715 A JPS60228715 A JP S60228715A
Authority
JP
Japan
Prior art keywords
rocker arm
engine
lever ratio
tappet
valve lift
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.)
Pending
Application number
JP8408884A
Other languages
Japanese (ja)
Inventor
Masahiro Kamo
加茂　正博
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.)
Suzuki Motor Corp
Original Assignee
Suzuki 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 Suzuki Motor Corp filed Critical Suzuki Motor Corp
Priority to JP8408884A priority Critical patent/JPS60228715A/en
Publication of JPS60228715A publication Critical patent/JPS60228715A/en
Pending 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
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio

Landscapes

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

Abstract

PURPOSE:To control a valve lift in an engine and improve its fuel consumption and intake efficiency, by using two rocker arms, which provide different lever ratio, to be switched in accordance with a speed of the engine. CONSTITUTION:An engine provides a rocker arm 3 of small level ratio and a rocker arm 4 of large lever ratio for a single cam 1 and a single tappet 8, so that the rocker arm 4 of large lever ratio may be controlled, for instance, by a plunger 11 arranged in a pressure oil chamber 10 to which oil is supplied from a lubricating oil pump. In this way, the engine, when it is driven at a high speed, provides a valve lift to be increased by adapting the rocker arm 4 of large lever ratio to the tappet 8, and efficiency of intake and exhaust of the engine is improved. While the engine, when it is driven at a low speed, provides the valve lift to be decreased so as to increase a flow speed of intake air, and fuel efficiency of the engine can be improved.

Description

【発明の詳細な説明】 この発明は、４サイクルエンジンのバルブリフト可変装
置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable valve lift device for a four-stroke engine.

４サイクルエンジンでは、クランクシャフトに連動させ
たカムシャフトのカムの回転に工ってロッカー了−ムを
揺動させ、傘形の吸排気用のパルプをバネに抗して押下
げて開く工うにしている。In a 4-stroke engine, the rocker end is swung by the rotation of the cam on the camshaft linked to the crankshaft, and the umbrella-shaped intake and exhaust pulp is pushed down against a spring to open it. I have to.

従って、パルプの開閉タイミングと、パルプの開き量で
あるリフト量は、カムの形状にＬつで定まる。高速で高
出力を要求されるエンジンでは、パルプタイミングを大
きくシ、リフト量を大きくして、高速運転時に吸排気の
交換が工くできて吸排気効率を上げることに工って出力
の増加を図っている。ところが、この工うに設定すると
、吸排気のパルプが開いているときがラップする工うに
なり、回転が遅く吸気量が少い低速では、吸気の吹抜け
が起り、又、吸気の流入速度が遅くなって燃焼効率が低
下し、出力が低下する不都合がある。Therefore, the opening/closing timing of the pulp and the lift amount, which is the opening amount of the pulp, are determined by L depending on the shape of the cam. For engines that require high output at high speeds, output can be increased by increasing the pulp timing and increasing the lift amount, making it possible to exchange the intake and exhaust during high-speed operation and increasing intake and exhaust efficiency. I'm trying. However, when this setting is made, the intake/exhaust pulp wraps when it is open, and at low speeds where the rotation is slow and the amount of intake air is small, intake air blow-through occurs, and the intake air inflow speed becomes slow. This has the disadvantage of lowering combustion efficiency and lowering output.

この発明は、かかる点に鑑み、レバー比が異る二つのロ
ッカー了−ムに工って、高低速でパルプのリフト量を可
変して開き量を変え、高速域で高出力を得ながら、低速
域でも出力全確保できるＬうに改善した本ので、以下図
面に示す本発明の実施例について説明する。In view of this, this invention has two rocker mechanisms with different lever ratios to vary the opening amount by varying the amount of lift of the pulp at high and low speeds, and to obtain high output at high speeds. Since this book has been improved to the point where full output can be ensured even in the low speed range, the embodiments of the present invention shown in the drawings will be described below.

カム１を設けたカムシャフト２は、クランクシャフトと
チェノ等で連動して回転する工うにしてあって、カム１
の形状は、パルプタイミングとリフトが高速型に設定し
である。ロッカー了−ム３゜４は、支軸５．６の位置を
変えて、レバー比を変えた、レバー比が小さいロッカー
アーム３と、レバー比が大きいロッカーアーム４の二つ
が用意しである。吸排気用の傘形のパルプ７は、上部に
タペット８が被層され、バネ９で閉る工うに付勢しであ
る。レバー比が小さいロッカーアーム３は、先端をタペ
ット８の一側上に配置しである。レバー比が大きいロッ
カーアーム４は、油圧室１０のプランジャー１１に連結
してあって、横に摺動できる工うになっており、タペッ
ト８上から外れたり、タペット８上に乗って嵌り合うこ
とができるようになって層る。油圧室ＩＯには、エンジ
ンに連動するオイルポンプの油圧が配管され、高速域で
高圧になるとバネ１２に抗してプランジャー１１を押し
、ロッカーアーム４をタペット８上に嵌合せる。油圧室
１０は、代りに、回転センサーで作動するソレノイドや
、負圧可動片等を用いても↓い。The camshaft 2 provided with the cam 1 is designed to rotate in conjunction with a crankshaft and a chain wheel, etc.
The shape of the pulp timing and lift are set to high speed type. The rocker arm 3.4 is available in two types, the rocker arm 3 with a small lever ratio and the rocker arm 4 with a large lever ratio, which have different lever ratios by changing the position of the support shaft 5.6. The umbrella-shaped pulp 7 for intake and exhaust has a tappet 8 layered on its upper part and is biased to close by a spring 9. The rocker arm 3 with a small lever ratio has its tip disposed on one side of the tappet 8. The rocker arm 4, which has a large lever ratio, is connected to the plunger 11 of the hydraulic chamber 10 and is designed to be able to slide sideways, so that it does not come off from above the tappet 8 or fit onto the tappet 8. layer. The hydraulic pressure of an oil pump linked to the engine is piped to the hydraulic chamber IO, and when the pressure becomes high in a high speed range, the plunger 11 is pushed against the spring 12, and the rocker arm 4 is fitted onto the tappet 8. The hydraulic chamber 10 may alternatively be a solenoid operated by a rotation sensor, a negative pressure movable piece, or the like.

作用について説明する。The effect will be explained.

低速域では、レバー比が大きいロッカーアーム４は、タ
ペット８上から外れており、カム１は、レバー比が小さ
いロッカーアーム３の揺動で、タペット８及びパルプ７
をバネ９に抗して押下げて開く。この場合の作動は、レ
バー比が小さいロッカーアーム３であるので、パルプ７
のリフトは小さく、開き量が少いので、吹抜けが少く、
吸気の流入速度が早くなって、渦流が生じて燃焼効率が
工〈なり、出力が向上する。高速域になると、プランジ
ャー１２が動いて、レバー比が大きいロッカー了−ム４
がタペット８上に嵌り合い、カム１の回転によって、ロ
ッカーアーム４を揺動させてパルプ７を開く。この場合
、パルプ７のリフトが大きくなって開き量が増し、吸排
気効率が向上して、高速での高出力が図れる。この間、
レバー比が小さめロッカーアーム３は、カム１の回転で
揺動するが遊んでいることになる。In the low speed range, the rocker arm 4 with a large lever ratio is off the top of the tappet 8, and the cam 1 is rotated by the swinging of the rocker arm 3 with a small lever ratio.
Press down against spring 9 to open. In this case, since the rocker arm 3 has a small lever ratio, the pulp 7
The lift is small and the amount of opening is small, so there is little blow-through,
The inflow speed of intake air becomes faster, creating a vortex flow that improves combustion efficiency and improves output. In the high speed range, the plunger 12 moves and the rocker end 4 with a large lever ratio is moved.
is fitted onto the tappet 8, and the rotation of the cam 1 swings the rocker arm 4 to open the pulp 7. In this case, the lift of the pulp 7 becomes larger, the amount of opening increases, the intake and exhaust efficiency improves, and high output at high speed can be achieved. During this time,
The rocker arm 3, which has a smaller lever ratio, swings with the rotation of the cam 1, but it is idle.

以上説明した工うに、本発明は、カムシャフトのカムの
回転にＬつでロッカーアームを揺動させ、パルプ上部の
タペットを押下げてパルプを開くようにしたものにおい
て、一つのカムと一つのタペットに対し、レバー比が小
さいロッカーアームとレバー比が大き−ロッカーアーム
とを設け、レバー比が大きいロッカー了−ムをタペット
に嵌外し可能にし、高速域でタペットに嵌合せるＬうに
したので、低速域ではレバー比が小さいロッカーアーム
に工ってバルブリフトを小さくして、吸気の流速を早め
て燃焼効率を上げることに工す高出力を得ることができ
、高速域では、レバー比が大きいロッカーアームにより
バルブリフトを大キくシて吸排気効率を高め、高出力を
得ることができる。As explained above, the present invention is a device in which a rocker arm is swung by L according to the rotation of a cam of a camshaft, and a tappet on the upper part of the pulp is pushed down to open the pulp. A rocker arm with a small lever ratio and a rocker arm with a large lever ratio are provided for the tappet, and the rocker arm with a large lever ratio can be fitted to and removed from the tappet, so that it can be fitted to the tappet at high speeds. In the low speed range, high power can be obtained by modifying the rocker arm with a small lever ratio to reduce the valve lift and increase the intake air flow velocity to increase combustion efficiency.In the high speed range, the lever ratio is large. The rocker arm increases the valve lift to increase intake and exhaust efficiency, resulting in high output.

そして、高速用のロッカーアームを摺動可能に付加する
だけで１いので、加工手間のかかるカムは一つで↓く、
安価にできる。And since all you need to do is add a sliding rocker arm for high speed, you only need one cam, which requires a lot of processing time.
It can be done cheaply.

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

図は本発明の一実施例を示し、第１図は側面図、第２図
は正面図である。 １・・・カム、２・・・カムシャフト、３・・・レバー
比カ小すいロッカーアーム、４・・・レバー比カ大キイ
ロッカーアーム、７・・・パルプ、８・・・タペット。 出願人代理人　猪　股　清The figures show one embodiment of the present invention, with FIG. 1 being a side view and FIG. 2 being a front view. 1...Cam, 2...Camshaft, 3...Rocker arm with small lever ratio, 4...Rocker arm with large key lever ratio, 7...Pulp, 8...Tappet. Applicant's agent Kiyoshi Inomata

Claims (1)

【特許請求の範囲】[Claims] カムシャフトのカムの回転に１ってロッカーアームを揺
動させ、パルプ上部のタペットヲ押下げてバルブ全開く
工うにしたものにおいて、一つのカムと一つのタペット
に対し、レバー比が小さいロッカーアームとレバー比が
大キいロッカーアームトを設ケ、レバー比が大きいロッ
カーアームをタペットに嵌外し可能にし、高速域でタペ
ットに嵌合せる工うにしたことを特徴とする４サイクル
エンジンのバルブリフト可変装置。The rocker arm is swung by the rotation of the cam on the camshaft, and the tappet at the top of the pulp is pushed down to fully open the valve. A variable valve lift device for a 4-cycle engine, which is characterized by having a rocker arm with a large lever ratio, making it possible to fit and remove the rocker arm with a large lever ratio on the tappet, and making it possible to fit on the tappet at high speeds. .
JP8408884A 1984-04-27 1984-04-27 Variable device of valve lift in four-cycle engine Pending JPS60228715A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8408884A JPS60228715A (en) 1984-04-27 1984-04-27 Variable device of valve lift in four-cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8408884A JPS60228715A (en) 1984-04-27 1984-04-27 Variable device of valve lift in four-cycle engine

Publications (1)

Publication Number Publication Date
JPS60228715A true JPS60228715A (en) 1985-11-14

Family

ID=13820744

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8408884A Pending JPS60228715A (en) 1984-04-27 1984-04-27 Variable device of valve lift in four-cycle engine

Country Status (1)

Country Link
JP (1) JPS60228715A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102966395A (en) * 2012-11-06 2013-03-13 上海交通大学 Single-valve height pneumatic control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102966395A (en) * 2012-11-06 2013-03-13 上海交通大学 Single-valve height pneumatic control system

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