JPH0533681Y2 - - Google Patents
Info
- Publication number
- JPH0533681Y2 JPH0533681Y2 JP1987063584U JP6358487U JPH0533681Y2 JP H0533681 Y2 JPH0533681 Y2 JP H0533681Y2 JP 1987063584 U JP1987063584 U JP 1987063584U JP 6358487 U JP6358487 U JP 6358487U JP H0533681 Y2 JPH0533681 Y2 JP H0533681Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- umbrella
- shaped
- valves
- cylinder head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
Description
【考案の詳細な説明】
〔産業上の利用分野〕
この考案は、四サイクルエンジンの動弁装置に
関する。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a valve train for a four-stroke engine.
四サイクルエンジンは、シリンダーヘツドの燃
焼室に、吸気及び排気用の傘形バルブを設けてい
る。傘形バルブは、一般に、シリンダーヘツドの
燃焼室側からシリンダーヘツドに設けたバルブガ
イドに摺動自在に挿入して、バルブスプリングで
閉じる方向に付勢し、クランクシヤフトに連動す
るカムシヤフトのカムの回転によつて、傘形バル
ブをバルブスプリングに抗して押下げて開くよう
にしている。バルブスプリングは、コンル状で内
側に傘形バルブとバルブガイドが入るようになつ
ている。例えば、特開昭56−162216号公報、実開
昭52−117714号公報参照。一方、四サイクルエン
ジンは、吸気効率や排気効率を高めるために、二
つの吸気バルフや二つの排気バルブを並設して開
口面積を大きくする方式や、弁機構を簡素化する
ために、一つの吸気バルブと一つの排気バルブを
ほぼ平行に並設して一本のカムシヤフトで吸気バ
ルブと排気バルブを直接駆動する方式が知られて
いる。これらの方式の場合、バルブスプリングが
バルブガイドの外側に配置されていて、外径が大
きくなるので、二つ並べたバルブ間寸法が大きく
なり、バルブ径が制約されて、開口面積を大きく
できない不都合がある。
A four-stroke engine has umbrella valves for intake and exhaust in the combustion chamber of the cylinder head. Umbrella valves are generally slidably inserted into a valve guide provided in the cylinder head from the combustion chamber side of the cylinder head, and are biased in the closing direction by a valve spring, causing the rotation of a cam on a camshaft that is linked to the crankshaft. The umbrella-shaped valve is opened by pushing it down against the valve spring. The valve spring is cone-shaped and has an umbrella-shaped valve and valve guide inside. For example, see Japanese Unexamined Patent Publication No. 162216/1982 and No. 117714 of Japanese Utility Model Publication No. 52-117. On the other hand, four-cycle engines have two intake valves and two exhaust valves installed side by side to increase the opening area in order to increase intake efficiency and exhaust efficiency, and one system that increases the opening area to simplify the valve mechanism. A known method is to arrange an intake valve and an exhaust valve almost parallel to each other and directly drive the intake valve and exhaust valve with a single camshaft. In the case of these methods, the valve spring is placed outside the valve guide and the outer diameter becomes large, so the dimension between two valves arranged side by side becomes large, which limits the valve diameter and makes it impossible to increase the opening area. There is.
この考案は、二つのバルブをほぼ平行に並べて
配置する方式のエンジンにおいて、バルブスプリ
ングの外径を小さくして、二つ並べたバルブのバ
ルブ間寸法を小さくすることにより、バルブ径の
大きい、そして開口面積の大きな四サイクルエン
ジンの動弁装置を得ることを目的とする。
This idea was developed in an engine in which two valves are arranged almost parallel to each other, by reducing the outer diameter of the valve spring and reducing the distance between the two valves. The purpose of this invention is to obtain a valve train for a four-stroke engine with a large opening area.
以下、本考案を図面に示す実施例によつて説明
する。
The present invention will be explained below with reference to embodiments shown in the drawings.
吸気及び排気用のバルブは、傘形をした傘形バ
ルブ１で、シリンダーヘツド２の燃焼室３側か
ら、シリンダーヘツド２に圧入したバルブガイド
４に、摺動自在に挿入する。バルブガイド４の上
端部分は、シリンダーヘツド２の段部５より突出
しており、このバルブガイド４の上端突出部分の
上方を覆う円筒状のカラー６が前記段部５に取付
けられている。カラー６は、上部の孔７から潤滑
オイルが流入するようにしてあり、バルブガイド
４の上端に被着したステムシール８より下側部分
に横孔９又は溝１０を設けて、潤滑オイルが抜け
るようにしてある。カラー６の上面は、バルブス
プリング１１の受座となり、コイル状のバルブス
プリング１１を載置することにより、バルブスプ
リング１１の受座をバルブガイド４の先端より高
い位置に形成する（バルブスプリング１１はバル
ブガイド４を巻回せず、傘形バルブ１の軸部分の
みを巻回するように配設される）。そして、バル
ブスプリング１１の上端は、傘形バルブ１の上端
に取付けたリテーナ１２に弾接させて、傘形バル
ブ１を閉じるように付勢させる。傘形バルブ１の
上端にはタペツト１３を被着し、タペツト１３の
上に、クランクシヤフトに連動して回転するカム
シヤフト１４のカム１５が配置してある。 The intake and exhaust valves are umbrella-shaped valves 1 which are slidably inserted into a valve guide 4 press-fitted into the cylinder head 2 from the combustion chamber 3 side of the cylinder head 2. The upper end portion of the valve guide 4 protrudes from a stepped portion 5 of the cylinder head 2, and a cylindrical collar 6 is attached to the stepped portion 5 to cover the upper portion of the valve guide 4. The collar 6 is configured so that lubricating oil flows in through a hole 7 at the top, and a horizontal hole 9 or groove 10 is provided below the stem seal 8 attached to the upper end of the valve guide 4 to allow the lubricating oil to escape. It's like this. The upper surface of the collar 6 becomes a seat for the valve spring 11, and by placing the coiled valve spring 11, the seat for the valve spring 11 is formed at a position higher than the tip of the valve guide 4 (the valve spring 11 is (The valve guide 4 is not wound, but only the shaft portion of the umbrella-shaped valve 1 is wound.) The upper end of the valve spring 11 is brought into elastic contact with a retainer 12 attached to the upper end of the umbrella-shaped valve 1, thereby urging the umbrella-shaped valve 1 to close. A tappet 13 is attached to the upper end of the umbrella-shaped valve 1, and a cam 15 of a camshaft 14 that rotates in conjunction with the crankshaft is arranged on the tappet 13.
傘形バルブ１は、バルブスプリング１１で閉じ
るように付勢されており、カムシヤフト１４のカ
ム１５の回転によつて、傘形バルブ１をバルブス
プリング１１に抗して押下げて開く。バルブスプ
リング１１は、カラー６の上面に載置してあり、
コイル状に巻いた内径内には、傘形バルブ１の軸
部分が通るだけであり、バルブガイド４よりも内
径を小さくなつて、細いものにできる。このた
め、二つの傘形バルブ１を燃焼室３の片側に並べ
る場合に、バルブ間寸法が小さくなり、傘形のバ
ルブ径を大きくできて、開口面積を大きくでき
る。こうして、吸気効率及び排気効率のよい高性
能エンジにできる。
The umbrella-shaped valve 1 is urged to close by a valve spring 11, and the rotation of a cam 15 of a camshaft 14 pushes the umbrella-shaped valve 1 down against the valve spring 11 to open it. The valve spring 11 is placed on the top surface of the collar 6,
Only the shaft portion of the umbrella-shaped valve 1 passes through the coiled inner diameter, and the inner diameter is smaller than that of the valve guide 4, so it can be made thinner. Therefore, when two umbrella-shaped valves 1 are arranged on one side of the combustion chamber 3, the dimension between the valves becomes smaller, the diameter of the umbrella-shaped valves can be increased, and the opening area can be increased. In this way, a high-performance engine with good intake efficiency and exhaust efficiency can be achieved.
以上説明したように、この考案は、バルブガイ
ドのシリンダーヘツドより突出する部分の上方を
覆う円筒状のカラーの上面をコイル状のバルブス
プリングの一方の受座とした、すなわち、バルブ
ガイドの先端より高い位置にバルブスプリングの
一方の受座を形成したので、バルブスプリングの
内径をバルブガイドより小さくでき、細いものに
できる。このため、二つ並べた傘形バルブは、バ
ルブ間寸法を小さく、傘形バルブの傘形のバルブ
部分を大きく有効に燃焼室内に配置できて、開口
面積を大きくできる。このため、吸気効率及び排
気効率のよい高性能エンジンにすることができ
る。
As explained above, this idea uses the upper surface of the cylindrical collar that covers the upper part of the valve guide that protrudes from the cylinder head as a seat for one of the coiled valve springs. Since one seat of the valve spring is formed at a high position, the inner diameter of the valve spring can be made smaller than the valve guide, allowing it to be made thinner. Therefore, when two umbrella-shaped valves are arranged side by side, the distance between the valves can be reduced, and the umbrella-shaped valve portion of the umbrella-shaped valve can be effectively disposed within the combustion chamber, thereby increasing the opening area. Therefore, a high-performance engine with good intake efficiency and exhaust efficiency can be achieved.
図は本考案の一実施例を示す縦断側面図であ
る。
１……傘形バルブ、２……シリンダーヘツド、
３……燃焼室、４……バルブガイド、６……カラ
ー、１１……バルブスプリング、１２……リテー
ナ。
The figure is a longitudinal sectional side view showing an embodiment of the present invention. 1... Umbrella valve, 2... Cylinder head,
3... Combustion chamber, 4... Valve guide, 6... Collar, 11... Valve spring, 12... Retainer.
Claims (1)
排気用の各傘形バルブが摺動自在に挿入されるバ
ルブガイドと、 該バルブガイドのシリンダーヘツドより突出す
る部分の上方を覆う円筒状のカラーと、 該カラーの上面と前記傘形バルブ上端に設けた
リテーナとの間に張設されたコイル状のバルブス
プリングと、 からなることを特徴とする四サイクルエンジンの
動弁装置。[Scope of Claim for Utility Model Registration] A valve guide that is attached to a cylinder head and into which each umbrella-shaped valve for intake or exhaust is slidably inserted, and that covers the upper portion of the valve guide that protrudes from the cylinder head. A valve operating device for a four-stroke engine, comprising: a cylindrical collar; and a coiled valve spring stretched between the upper surface of the collar and a retainer provided at the upper end of the umbrella-shaped valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987063584U JPH0533681Y2 (en) | 1987-04-27 | 1987-04-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987063584U JPH0533681Y2 (en) | 1987-04-27 | 1987-04-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63170503U JPS63170503U (en) | 1988-11-07 |
| JPH0533681Y2 true JPH0533681Y2 (en) | 1993-08-26 |
Family
ID=30898950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987063584U Expired - Lifetime JPH0533681Y2 (en) | 1987-04-27 | 1987-04-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0533681Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5390513A (en) * | 1977-01-19 | 1978-08-09 | Toyota Motor Corp | Valve spring mounting structure for engine |
-
1987
- 1987-04-27 JP JP1987063584U patent/JPH0533681Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5390513A (en) * | 1977-01-19 | 1978-08-09 | Toyota Motor Corp | Valve spring mounting structure for engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63170503U (en) | 1988-11-07 |
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