JPH064003Y2 - Four-cycle engine valve drive - Google Patents
Four-cycle engine valve driveInfo
- Publication number
- JPH064003Y2 JPH064003Y2 JP18430187U JP18430187U JPH064003Y2 JP H064003 Y2 JPH064003 Y2 JP H064003Y2 JP 18430187 U JP18430187 U JP 18430187U JP 18430187 U JP18430187 U JP 18430187U JP H064003 Y2 JPH064003 Y2 JP H064003Y2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- intake
- camshaft
- valve
- 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
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 field of application] The present invention relates to a valve train for a four-cycle engine.
四サイクルエンジンは、二つの吸気弁と二つの排気弁を
設けた四弁式にすると、吸気効率及び排気効率が共に向
上して高出力が得られることが知られている。又、点火
プラグは、燃焼室の中央に配置するのが燃焼効率上好ま
しい。このように配置すると、二つのカムシャフトを設
けて、吸気弁と排気弁を各々専用に開閉することにな
り、カムシャフトの位置が両側にできて、レイアウト上
都合がよい。ところが、部品点数が増して製造コストが
高くつき、重量も重くなる不都合がある。例えば実開昭
６０−１８０７４０号公報参照。一つのカムシャフト
で、吸気弁と排気弁を共に開閉するようにすれば、カム
シャフトが一つで足りて部品点数を少くできるが、ロッ
カーアームなどの組付け上の問題などがあって問題が多
い。例えば特開昭６１−１２３７４６号公報参照。It is known that when a four-cycle engine is a four-valve type engine having two intake valves and two exhaust valves, both intake efficiency and exhaust efficiency are improved and high output is obtained. Further, it is preferable to arrange the ignition plug in the center of the combustion chamber in terms of combustion efficiency. With this arrangement, two cam shafts are provided and the intake valve and the exhaust valve are opened and closed respectively, so that the cam shafts can be located on both sides, which is convenient in terms of layout. However, there are disadvantages that the number of parts increases, the manufacturing cost increases, and the weight increases. See, for example, Japanese Utility Model Laid-Open No. 60-180740. If only one camshaft is used to open and close both the intake valve and the exhaust valve, one camshaft will suffice and the number of parts can be reduced.However, there are problems in the assembly of rocker arms etc. Many. See, for example, Japanese Patent Application Laid-Open No. 61-123746.
この考案は、一気筒当り二つの吸気弁と二つの排気弁を
設けた四弁式で、一つのカムシャフトで開閉し、燃焼室
中央に点火プラグを配し、しかもカムシャフトとロッカ
ーアームの組付け性がよく、剛性も高くできる四サイク
ルエンジンの動弁装置を得ることを目的とする。This invention is a four-valve system with two intake valves and two exhaust valves per cylinder, opened and closed with one camshaft, an ignition plug in the center of the combustion chamber, and a combination of camshaft and rocker arm. It is an object of the present invention to obtain a valve train for a four-cycle engine that has good attachment properties and high rigidity.
以下、本考案を図面に示す実施例によって説明する。 Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings.
シリンダーヘッド１は、軽合金で鋳造するもので、下面
に燃焼室２が設けてある。燃焼室２の中央に上方にプラ
グ孔３が設けてあって、筒体４を挿入して、オイルシー
ルでシールする。筒体４は、ヘッドカバー５の孔６に通
じており、点火プラグ７を挿入してプラグ孔３端に螺着
し、点火プラグ７の先端を燃焼室２の中央に臨ませる。
燃焼室２には、両側に分けて、傘形の二つの吸気弁８と
二つの排気弁９が配してある。吸気弁８及び排気弁９
は、摺動自在で、バネで閉じるように付勢してある。カ
ムシャフト１０は、吸気カム１１と排気カム１２が設け
てあり、シリンダーヘッド１の上面の排気弁９側に寄せ
て、軸受けキャップ１３で、回転自在に軸架する。軸受
けキャップ１３は鋳鉄製である。カムシャフト１０は、
クランク軸とタイミングベルト又はチエンなどで連結さ
れて連動回転する。排気ロッカーアーム１４は、基端を
ピボット１５に支承し、先端を排気弁９に当接させ、上
面を排気カム１２に当ててある。ロッカーシャフト１６
は、短いものを複数にしてあって、筒体４に挿入できる
ようにした軸受け１７で、シリンダーヘッド１の上面に
端部を保持させる。軸受け１７は鋳鉄製である。ロッカ
ーシャフト１６には吸気ロッカーアーム１８を揺動自在
に軸着し、吸気ロッカーアーム１８は基部を吸気カム１
１に当て、先端を吸気弁８に当てるようにしてある。The cylinder head 1 is cast from a light alloy and has a combustion chamber 2 on the lower surface. A plug hole 3 is provided above the center of the combustion chamber 2, and a cylinder 4 is inserted and sealed with an oil seal. The cylindrical body 4 communicates with the hole 6 of the head cover 5, and the spark plug 7 is inserted and screwed into the end of the plug hole 3 so that the tip of the spark plug 7 faces the center of the combustion chamber 2.
In the combustion chamber 2, two umbrella-shaped intake valves 8 and two exhaust valves 9 are arranged on both sides. Intake valve 8 and exhaust valve 9
Is slidable and biased to close with a spring. The camshaft 10 is provided with an intake cam 11 and an exhaust cam 12, and is brought closer to the exhaust valve 9 side of the upper surface of the cylinder head 1 and is rotatably mounted by a bearing cap 13. The bearing cap 13 is made of cast iron. The camshaft 10 is
It is linked to the crankshaft with a timing belt or chain and rotates in conjunction. The exhaust rocker arm 14 has a base end supported by a pivot 15, a front end abutting the exhaust valve 9, and an upper surface abutting the exhaust cam 12. Rocker shaft 16
Is a plurality of short bearings, and the ends of the bearings are held on the upper surface of the cylinder head 1 by a bearing 17 that can be inserted into the cylindrical body 4. The bearing 17 is made of cast iron. An intake rocker arm 18 is swingably attached to the rocker shaft 16, and the intake rocker arm 18 has a base portion for intake cam 1.
1, and the tip end is brought into contact with the intake valve 8.
カムシャフト１０の回転によって、吸気カム１１は、吸
気ロッカーアーム１８を揺動させて、吸気弁８をバネに
抗して押下げて開閉させる。又、排気カム１２は、排気
ロッカーアーム１４を揺動させて、排気弁９押下げて開
閉させる。一つの燃焼室２に対し、二つの吸気弁８と二
つの排気弁９を設けることができて、吸気効率及び排気
効率を高くできる。又、点火プラグ７を燃焼室２の中央
に配置できて、燃焼効率も高く、全体として高性能にで
きる。カムシャフト１０は、吸気カム１１と排気カム１
２を設けたもの一つでよくて、部品点数を少く軽量にで
きる。ロッカーシャフト１６は、短いものを複数に分
け、軸受け１７でシリンダーヘッド１の上面に保持させ
るので、組付け性もよい。軸受けキャップ１３と軸受け
１７は、鋳鉄製にできて、シリンダーヘッド１の上面に
締着するので、剛性を高くでき、騒音発生を少くでき
る。Due to the rotation of the cam shaft 10, the intake cam 11 swings the intake rocker arm 18 to push down the intake valve 8 against the spring to open and close it. Further, the exhaust cam 12 swings the exhaust rocker arm 14 to push down the exhaust valve 9 to open and close it. Since two intake valves 8 and two exhaust valves 9 can be provided for one combustion chamber 2, intake efficiency and exhaust efficiency can be improved. Further, since the ignition plug 7 can be arranged in the center of the combustion chamber 2, the combustion efficiency is high and the overall performance is high. The camshaft 10 includes an intake cam 11 and an exhaust cam 1.
One with two is sufficient, and the number of parts can be reduced and the weight can be reduced. The rocker shaft 16 is divided into a plurality of short ones and is held on the upper surface of the cylinder head 1 by the bearings 17, so that the rocker shaft 16 can be easily assembled. Since the bearing cap 13 and the bearing 17 are made of cast iron and fastened to the upper surface of the cylinder head 1, the rigidity can be increased and the noise generation can be reduced.
以上説明したように、この考案は、一気筒当り二つの吸
気弁と二つの排気弁を設けた一つのカムシャフトで開閉
するのに於て、シリンダーヘッドの燃焼室の中央上方に
プラグ孔を設けて筒体を挿入連結し、プラグ孔に点火プ
ラグを挿入螺着し、カムシャフトを排気弁側に寄せて軸
受けキャップでシリンダーヘッド上面に回転自在に軸架
し、排気ロッカーアームを揺動させて排気弁を開閉し、
筒体に挿入した軸受けで、シリンダーヘッド上にロッカ
ーシャフトを保持させ、ロッカーシャフトに吸気ロッカ
ーアームを軸着し、カムシャフトで揺動させて吸気弁を
開閉するようにしたので、全体として高性能エンジンに
でき、一つのカムシャフトで安価軽量にできる。又ロッ
カーシャフトの組付け性もよく、軸受けキャップと軸受
けを鋳鉄製にできて、剛性も高く騒音の少いものにでき
る。As described above, according to the present invention, a plug hole is provided above the center of the combustion chamber of the cylinder head when opening and closing with one cam shaft provided with two intake valves and two exhaust valves per cylinder. And insert the ignition plug into the plug hole, screw the camshaft toward the exhaust valve side, and rotatably mount it on the top of the cylinder head with the bearing cap, and swing the exhaust rocker arm. Open and close the exhaust valve,
With the bearing inserted in the cylinder, the rocker shaft is held on the cylinder head, the intake rocker arm is pivotally mounted on the rocker shaft, and the cam shaft swings to open and close the intake valve. It can be used as an engine and can be made inexpensive and lightweight with a single camshaft. Also, the rocker shaft can be easily assembled, and the bearing cap and the bearing can be made of cast iron, and the rigidity and noise can be reduced.
図は本考案の一実施例を示し、第１図はシリンダーヘッ
ドの平面図、第２図は部分平面図、第３図は第２図Ａ−
Ａ矢視断面図、第４図は第２図Ｂ−Ｂ矢視断面図であ
る。 １…シリンダーヘッド、２…燃料室、３…プラグ孔、４
…筒体、７…点火プラグ、８…吸気弁、９…排気弁、１
０…カムシャフト、１３…軸受けキャップ、１４…排気
ロッカーアーム、１６…ロッカーシャフト、１７…軸受
け、１８…吸気ロッカーアーム。FIG. 1 shows an embodiment of the present invention. FIG. 1 is a plan view of a cylinder head, FIG. 2 is a partial plan view, and FIG. 3 is FIG.
FIG. 4 is a sectional view taken along arrow A, and FIG. 4 is a sectional view taken along arrow BB of FIG. 1 ... Cylinder head, 2 ... Fuel chamber, 3 ... Plug hole, 4
... cylindrical body, 7 ... spark plug, 8 ... intake valve, 9 ... exhaust valve, 1
0 ... Cam shaft, 13 ... Bearing cap, 14 ... Exhaust rocker arm, 16 ... Rocker shaft, 17 ... Bearing, 18 ... Intake rocker arm.
Claims (1)
設けて一つのカムシャフトで開閉するものに於て、シリ
ンダーヘッドの燃焼室の中央上方にプラグ孔を設けて筒
体を挿入連結し、プラグ孔に点火プラグを挿入螺着し、
カムシャフトを排気弁側に寄せて軸受けキャップでシリ
ンダーヘッド上面に回転自在に軸架し、排気ロッカーア
ームを揺動させ排気弁を開閉し、筒体に挿入した軸受け
で、シリンダーヘッド上面にロッカーシャフトを保持さ
せ、ロッカーシャフトに吸気ロッカーアームを軸着し、
カムシャフトで揺動させて吸気弁を開閉するようにした
ことを特徴とする四サイクルエンジンの動弁装置。Claim: What is claimed is: 1. One cylinder is provided with two intake valves and two exhaust valves to be opened and closed by one camshaft. A plug hole is provided above the center of a combustion chamber of a cylinder head to insert a cylinder. Connect, insert the spark plug into the plug hole, screw it in,
The camshaft is moved closer to the exhaust valve side and rotatably mounted on the upper surface of the cylinder head with the bearing cap.The exhaust rocker arm is rocked to open / close the exhaust valve. Hold the air intake rocker arm on the rocker shaft,
A valve operating system for a four-cycle engine, characterized in that the intake valve is opened and closed by rocking on a camshaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18430187U JPH064003Y2 (en) | 1987-12-04 | 1987-12-04 | Four-cycle engine valve drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18430187U JPH064003Y2 (en) | 1987-12-04 | 1987-12-04 | Four-cycle engine valve drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0188006U JPH0188006U (en) | 1989-06-09 |
| JPH064003Y2 true JPH064003Y2 (en) | 1994-02-02 |
Family
ID=31475672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18430187U Expired - Lifetime JPH064003Y2 (en) | 1987-12-04 | 1987-12-04 | Four-cycle engine valve drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH064003Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2568846Y2 (en) * | 1993-11-05 | 1998-04-15 | 川崎重工業株式会社 | Rocker arm support structure |
| US9146215B2 (en) | 2011-09-29 | 2015-09-29 | Electric Power Research Institute, Inc. | Apparatus and method for inspection of tubes in a boiler |
-
1987
- 1987-12-04 JP JP18430187U patent/JPH064003Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0188006U (en) | 1989-06-09 |
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