JPS61275511A - Valve push-back device with cam in four-cycle internal combustion engine - Google Patents

Valve push-back device with cam in four-cycle internal combustion engine

Info

Publication number
JPS61275511A
JPS61275511A JP11615585A JP11615585A JPS61275511A JP S61275511 A JPS61275511 A JP S61275511A JP 11615585 A JP11615585 A JP 11615585A JP 11615585 A JP11615585 A JP 11615585A JP S61275511 A JPS61275511 A JP S61275511A
Authority
JP
Japan
Prior art keywords
valve
cam
suction
internal combustion
combustion engine
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
JP11615585A
Other languages
Japanese (ja)
Inventor
Hiroyuki Kusano
草野 洋幸
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP11615585A priority Critical patent/JPS61275511A/en
Publication of JPS61275511A publication Critical patent/JPS61275511A/en
Pending legal-status Critical Current

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  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

PURPOSE:To improve engine performance with higher fidelity in follow-up movement of valves in a four-cycle internal combustion engine by constituting such that suction and exhaust valves are pushed back to be closed by means of concavely shaped cams rather than push-back springs that force those valves resiliently toward closing direction. CONSTITUTION:In a configuration where a suction or an exhaust valve 3 is depressed to be opened by swinging a rocker arm 2 about a fulcrum 12 by rotation of a cam 1 which synchronizes with engine rotation, a concavely shaped cam 6 is arranged adjacent to the above-mentioned cam 1. A rocker arm 7 is then swung about a fulcrum 13 according to the rotation of the concavely shaped cam 6 to close the suction or exhaust valve 3 which has been opened by the action of the above-mentioned cam 1. The suction or exhaust valve 3, when closed, is brought into close contact with valve seats formed in a cylinder head part 4 by means of a spring 9 fitted resiliently over a valve shaft.

Description

【発明の詳細な説明】 イ 発明の目的 現在4サイクル内燃機関給排気系装置の弁戻しはバネに
よって為されているが、このため機関回転時には、シリ
ンダー内の圧力に抗して弁を押すだけでな(、このバネ
の反発力にも抗するだけの圧力をカムに与えている。ま
た高速回転時には、弁のカムに対する追縦性も悪くなる
。したがってこの追縦性を良くするために、さらに反発
力の強いバネを必要としている。本発明の目的は、弁を
戻ずさい、バネによらず、凹状カムを用いて、強制的に
これをなし、弁戻しバネを不用とさせるものである。
[Detailed Description of the Invention] A. Purpose of the Invention At present, the valve return of the supply and exhaust system for a four-stroke internal combustion engine is performed by a spring. Therefore, when the engine is rotating, the valve is simply pushed against the pressure inside the cylinder. (The pressure applied to the cam is sufficient to resist the repulsive force of this spring.Also, at high speed rotation, the ability of the valve to follow the cam deteriorates.Therefore, in order to improve this ability to follow the cam, Furthermore, a spring with a strong repulsive force is required.The purpose of the present invention is to forcefully return the valve by using a concave cam instead of using a spring, thereby eliminating the need for a valve return spring. be.

口 発明の構成 図中(1)は、現行通り、弁を開かせるためのカム、(
2)はダーヘッド部、(5)は弁の図中頭部、(6)は
現行弁を開かせるためのカムに隣接して設けた凹状カム
で、凹状部は現行カムの反対側に位置する。(7)は(
■3)を支点とする弁を戻すためのロッカーアーム、(
8)は白状の物で、弁軸を自在に図中上下するものとす
る。(9)は弁をシリンダーヘッド部に密着さ仕るため
のバネである。(10)は現行通り弁スキマ調整ボルト
。(11)はロックナツトである。
(1) in the block diagram of the invention shows a cam for opening the valve, (
2) is the head part, (5) is the top of the valve in the figure, and (6) is a concave cam installed adjacent to the cam for opening the current valve, and the concave part is located on the opposite side of the current cam. . (7) is (
■Rocker arm for returning the valve with 3) as the fulcrum, (
Item 8) is a white item, and the valve stem can be moved up and down freely in the figure. (9) is a spring for tightly fitting the valve to the cylinder head. (10) is the current valve clearance adjustment bolt. (11) is a lock nut.

弁を開か仕る場合は、現行通りのカム(1)、ロッカー
アーム(2)、弁(3)とによって為される。このとき
凹状力1. (6)の凹部に弁戻しロッカーアーム(7
)の先端が入り込み、その他端は図中下降するため、弁
の動きに制限を加えない。
When opening the valve, it is done by the existing cam (1), rocker arm (2), and valve (3). At this time, concave force 1. (6) into the valve return rocker arm (7).
) goes in, and the other end goes down as shown in the figure, so there is no restriction on the movement of the valve.

次に弁を戻す場合は、弁戻しロッカーアーム(7)の一
端が凹状カムの四部より外側へ出され、すなわち図中下
降する。このとき他端は図中上昇して、凹状の物(8)
を押し上げて、これと接する弁の頭部(5)を上昇させ
て弁戻しは完了する。このとき凹状の物(8)と弁の頭
部(5)との間隔が一定となるように、凹状カムの四部
は形成されているものとする。またバネ(9)は弁をシ
リンダーヘッド部に密着させるためのものである。
Next, when returning the valve, one end of the valve return rocker arm (7) is brought out from the four parts of the concave cam, that is, it is lowered in the figure. At this time, the other end rises in the figure and becomes a concave object (8).
The valve return is completed by pushing up the head (5) of the valve in contact with this. At this time, it is assumed that the four parts of the concave cam are formed so that the distance between the concave object (8) and the head (5) of the valve is constant. Further, the spring (9) is used to bring the valve into close contact with the cylinder head.

ハ 発明の効果 l 現行の4サイクル内燃機関で使用されている弁バネ
を省くことにより、カムに加えられていた弁バネの反発
力を省き、これがカム軸の負荷を低減させ、機関の性能
を向上させる。
C. Effects of the invention l By omitting the valve spring used in current four-stroke internal combustion engines, the repulsive force of the valve spring that was applied to the cam is eliminated, which reduces the load on the camshaft and improves engine performance. Improve.

2 機関高速回転時のカムに対する弁の追縦性が向上す
る。
2. Improves the ability of the valve to follow the cam when the engine rotates at high speed.

3 弁バネを省くことにより、弁軸部の全長が短縮され
、熱膨張によ乙軸部の伸展が減少されて、弁スキマの間
隔を狭めることかできる。
3. By omitting the valve spring, the overall length of the valve stem is shortened, the extension of the stem due to thermal expansion is reduced, and the gap between the valve gaps can be narrowed.

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

第1図は斜視図で、(1)lよ現在使用されているもの
と同様の弁を開かせるためのカム、(2)は(12)を
支点とするロッカーアーム、(3)は弁、(4)はシリ
ンダーヘッド部、(5)は弁の図中頭部、(6)は弁を
戻すために設けた凹状カム、(7)は(13)を支点と
する弁戻しのロッカーアーム、(8)は、弁軸にセット
した凹状の物、(5ン)は弁をシリンダーヘッド部に密
着させるためのバネ、(lb)は弁スキマ調整ボルト、
(11)はロックナツト。 第2図は弁とロッカーアームとの連結部の断面図。
Figure 1 is a perspective view, (1) l is a cam for opening a valve similar to the one currently used, (2) is a rocker arm with (12) as a fulcrum, (3) is a valve, (4) is the cylinder head, (5) is the head of the valve in the figure, (6) is a concave cam provided to return the valve, (7) is a rocker arm for returning the valve with (13) as the fulcrum, (8) is a concave item set on the valve stem, (5th inch) is a spring for tightly fitting the valve to the cylinder head, (lb) is a valve clearance adjustment bolt,
(11) is a rock nut. FIG. 2 is a sectional view of the connection between the valve and the rocker arm.

Claims (1)

【特許請求の範囲】[Claims] 1 4サイクル内燃機関の給排気系弁戻しバネの代わり
に凹状カムを用いて弁を戻す方法
1. How to return the valve in the supply and exhaust system of a 4-cycle internal combustion engine using a concave cam instead of a return spring
JP11615585A 1985-05-29 1985-05-29 Valve push-back device with cam in four-cycle internal combustion engine Pending JPS61275511A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11615585A JPS61275511A (en) 1985-05-29 1985-05-29 Valve push-back device with cam in four-cycle internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11615585A JPS61275511A (en) 1985-05-29 1985-05-29 Valve push-back device with cam in four-cycle internal combustion engine

Publications (1)

Publication Number Publication Date
JPS61275511A true JPS61275511A (en) 1986-12-05

Family

ID=14680129

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11615585A Pending JPS61275511A (en) 1985-05-29 1985-05-29 Valve push-back device with cam in four-cycle internal combustion engine

Country Status (1)

Country Link
JP (1) JPS61275511A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01144411U (en) * 1988-03-28 1989-10-04

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS616611B2 (en) * 1979-02-08 1986-02-27 Matsushita Electric Works Ltd

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS616611B2 (en) * 1979-02-08 1986-02-27 Matsushita Electric Works Ltd

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01144411U (en) * 1988-03-28 1989-10-04

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