JPS645065Y2 - - Google Patents
Info
- Publication number
- JPS645065Y2 JPS645065Y2 JP16951583U JP16951583U JPS645065Y2 JP S645065 Y2 JPS645065 Y2 JP S645065Y2 JP 16951583 U JP16951583 U JP 16951583U JP 16951583 U JP16951583 U JP 16951583U JP S645065 Y2 JPS645065 Y2 JP S645065Y2
- Authority
- JP
- Japan
- Prior art keywords
- water jacket
- intake
- cylinder head
- cooling
- cooling effect
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 230000000694 effects Effects 0.000 description 14
- 238000001816 cooling Methods 0.000 description 13
- 239000000498 cooling water Substances 0.000 description 10
- 238000002485 combustion reaction Methods 0.000 description 8
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【考案の詳細な説明】
本考案はエンジンのシリンダヘツドにおけるウ
オータジヤケツトの構造に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a water jacket in a cylinder head of an engine.
本考案は燃焼室周辺部の冷却効果及び吸排気ポ
ート周辺部や点火プラグ周辺部の冷却効果のいず
れにおいても優れたシリンダヘツドのウオータジ
ヤケツトを提供することを目的とする。 The object of the present invention is to provide a water jacket for a cylinder head that is excellent in both the cooling effect around the combustion chamber, the cooling effect around the intake/exhaust port, and the area around the spark plug.
従来のシリンダヘツドのウオータジヤケツトの
１例として、特開昭58−143149号公報に示される
ように、シリンダヘツドａ内に形成したウオータ
ジヤケツトｂの上壁部ｃをカムシヤフトｄのカム
ｅに干渉しないように円孤状に凹設したものがあ
る（第１図）。しかしこれは単にカムｅの干渉を
避けるために前記上壁部ｃを円孤状に凹設したも
のであるため、この上壁部ｃに接する部分の冷却
水の流れは、抵抗を受けることが少ないのでスム
ースである反面、ウオータジヤケツトｂの下部に
おける冷却水の流れは、大きな抵抗を受けてスム
ースでなく、燃焼室周辺部を構成するウオータジ
ヤケツトｂの下壁部ｆの冷却効果が不十分となり
バルブシートの耐久性が劣るという問題があつ
た。 As an example of a conventional cylinder head water jacket, as shown in Japanese Unexamined Patent Publication No. 58-143149, an upper wall c of a water jacket b formed in a cylinder head a is attached to a cam e of a camshaft d. There are some that are recessed in the shape of a circular arc to prevent interference (Figure 1). However, this is simply because the upper wall c is recessed in a circular arc shape to avoid interference with the cam e, so the flow of cooling water in the portion in contact with the upper wall c is not subject to resistance. On the other hand, the flow of cooling water at the lower part of the water jacket b is not smooth due to large resistance, and the cooling effect of the lower wall part f of the water jacket b, which forms the periphery of the combustion chamber, is insufficient. However, there was a problem that the durability of the valve seat was poor.
この問題を解決するものとして実開昭55−
170438号公報に示されるように、ウオータジヤケ
ツトｂの上部に冷却水路の過半分を遮断するリブ
ｇを設けて、ウオータジヤケツトｂを流れる冷却
水の上部に抵抗を与え、下部を流れる冷却水量を
増して、燃焼室周辺部の冷却効果を高めたものが
ある（第２図）。しかし前記リブｇを設けると吸
排気ポート周辺部等を冷却する冷却水量が減少し
て該部の冷却効果が低下する上に、リブｇと上壁
部ｃとの間に空気層が形成され易く、これによつ
てシリンダヘツドａにおける冷却水温度分布が悪
化し、場合によつてはシリンダヘツドａに亀裂が
生ずるという問題がある。 As a solution to this problem,
As shown in Publication No. 170438, a rib g is provided in the upper part of the water jacket b to block the majority of the cooling water passage, thereby providing resistance to the upper part of the cooling water flowing through the water jacket b, thereby reducing the amount of cooling water flowing in the lower part. There is one that increases the cooling effect around the combustion chamber by increasing the cooling effect (Figure 2). However, when the rib g is provided, the amount of cooling water that cools the area around the intake/exhaust port is reduced, which reduces the cooling effect of the area, and an air layer is likely to be formed between the rib g and the upper wall c. This causes a problem in that the temperature distribution of the cooling water in the cylinder head a deteriorates, and in some cases, cracks occur in the cylinder head a.
本考案は燃焼室周辺部の冷却効果を高めると共
に吸排気ポート周辺部等の冷却効果を高め、更に
第２図に示す先行技術における空気溜りによる不
具合をも解決したものである。 The present invention improves the cooling effect around the combustion chamber and around the intake/exhaust ports, and also solves the problems caused by air pockets in the prior art shown in FIG. 2.
本考案は上記目的を達成するため、第３図に示
す実施例に例示するように、吸排気バルブ間にウ
オータジヤケツトを有するシリンダヘツドにおい
て、該ウオータジヤケツト上端部の中央近傍のみ
をカム軸方向に沿つて略Ｖ字状に凹没させ、前記
吸排気バルブ間のウオータジヤケツトを略Ｖ字状
に形成して、シリンダヘツドにおけるウオータジ
ヤケツトの構造を構成したことを特徴とする。 In order to achieve the above object, the present invention has a cylinder head having a water jacket between the intake and exhaust valves, as exemplified in the embodiment shown in FIG. The water jacket is recessed in a substantially V-shape along the cylinder head, and the water jacket between the intake and exhaust valves is formed in a substantially V-shape to form a water jacket structure in the cylinder head.
第３図に示す実施例はクロスフロータイプのエ
ンジンに本考案を実施したものである。前記ウオ
ータジヤケツトＪはシリンダヘツドＨの下面に形
成した燃焼室４や、シリンダヘツドＨの吸気ポー
ト５、排気ポート６を囲むように形成され、又図
示しないが点火プラグ周辺部を冷却するに適する
ように形成されている。そして前記ウオータジヤ
ケツトＪはシリンダブロツク７のウオータジヤケ
ツト８と連通している。 The embodiment shown in FIG. 3 is an embodiment of the present invention in a cross-flow type engine. The water jacket J is formed to surround the combustion chamber 4 formed on the lower surface of the cylinder head H, the intake port 5, and the exhaust port 6 of the cylinder head H, and is suitable for cooling the area around the spark plug (not shown). It is formed like this. The water jacket J is in communication with the water jacket 8 of the cylinder block 7.
シリンダヘツドＨのウオータジヤケツトＪの上
壁部１は、第３図に示すように、その中央近傍に
おいてカム軸９方向に沿つて略Ｖ字状に凹没して
いる。この凹没部（上壁部）１はその上方に位置
するカム軸９のカム１０の干渉を避ける目的で形
成された第１図に示す先行技術の円孤状上壁部
（第３図に仮想線で示す。）ｃに比較して大きく下
方に凹入している。 As shown in FIG. 3, the upper wall portion 1 of the water jacket J of the cylinder head H is recessed in a substantially V-shape near the center along the direction of the camshaft 9. As shown in FIG. This concave part (upper wall part) 1 is formed in order to avoid interference with the cam 10 of the camshaft 9 located above it. (Indicated by a virtual line.) It is concave downward to a large extent compared to c.
本実施例の吸気バルブ２と排気バルブ３とは、
一般のものに比較し両バルブ２，３軸線のなす角
度が小さくとられ、両バルブ２，３間に形成され
るウオータジヤケツトＪの断面積が一般のものに
比較し減少せざるを得ない条件が課せられてい
る。 The intake valve 2 and exhaust valve 3 of this embodiment are as follows:
The angle formed by the axes of both valves 2 and 3 is smaller than that of ordinary valves, and the cross-sectional area of the water jacket J formed between both valves 2 and 3 has to be reduced compared to ordinary ones. conditions are imposed.
そして、前記ウオータジヤケツトＪの吸排気バ
ルブ２，３間の横断面形状は、第３図に示すよう
に、略Ｖ字状となつており、好ましくはその中央
下端の上下幅Ａが両側方部の横幅Ｂの１〜2.5倍
になるように構成するとよい。 The cross-sectional shape between the intake and exhaust valves 2 and 3 of the water jacket J is approximately V-shaped, as shown in FIG. It is preferable to configure it so that it is 1 to 2.5 times the width B of the section.
本考案は上記構成を有するので、次のような効
果を奏することができる。 Since the present invention has the above configuration, the following effects can be achieved.
シリンダヘツドのウオータジヤケツト上壁部
の中央近傍のみを略Ｖ字状に凹没させることに
よつて、ウオータジヤケツト内の通路抵抗を略
均一にすることができ、燃焼室周辺部を冷却す
る冷却水の水量を増加させることができるの
で、燃焼室周辺部の冷却効果を高めることがで
きる。 By recessing only the vicinity of the center of the upper wall of the water jacket of the cylinder head in a substantially V-shape, the passage resistance within the water jacket can be made approximately uniform, and the surrounding area of the combustion chamber can be cooled. Since the amount of cooling water can be increased, the cooling effect around the combustion chamber can be enhanced.
前記ウオータジヤケツトの吸排気バルブ間に
おける横断面形状を略Ｖ字状としたので、吸排
気ポート壁面に沿つて積極的に冷却水を流すこ
とができ、吸排気ポート周辺部や点火プラグ周
辺部の冷却効果を高めることができる。又、併
せてＶ字状の前記上壁部にリブを設けていない
のでウオータジヤケツトの上部に空気が溜まる
ことを防止できる。 Since the cross-sectional shape of the water jacket between the intake and exhaust valves is approximately V-shaped, the cooling water can actively flow along the walls of the intake and exhaust ports, and the area around the intake and exhaust ports and around the spark plug. can enhance the cooling effect of In addition, since no ribs are provided on the V-shaped upper wall, it is possible to prevent air from accumulating in the upper part of the water jacket.
本考案は上述のように、燃焼室周辺部の冷却効
果及び吸排気ポート周辺部等の冷却効果のいずれ
においても優れたシリンダヘツドのウオータジヤ
ケツトを提供することができ、特に上記実施例に
示すように吸排気バルブ間における流路面積を十
分にとれないエンジンにおいて、そこを流れる冷
却水を有効に活用させてその周辺部の冷却効果を
高めるために利用するとその効果は顕著である。 As described above, the present invention can provide a water jacket for a cylinder head that is excellent in both the cooling effect around the combustion chamber and the cooling effect around the intake and exhaust ports. In engines where the flow path area between the intake and exhaust valves is insufficient, the effect of effectively utilizing the cooling water flowing therein to enhance the cooling effect of the surrounding area is significant.
第１図は従来例の横断面図、第２図は他の従来
例の横断面図、第３図は本考案の実施例の横断面
図である。
１……ウオータジヤケツト上壁部、２……吸気
バルブ、３……排気バルブ、９……カム軸。
FIG. 1 is a cross-sectional view of a conventional example, FIG. 2 is a cross-sectional view of another conventional example, and FIG. 3 is a cross-sectional view of an embodiment of the present invention. 1... Upper wall of water jacket, 2... Intake valve, 3... Exhaust valve, 9... Camshaft.
Claims (1)
シリンダヘツドにおいて、該ウオータジヤケツト
上端部の中央近傍のみをカム軸方向に沿つて略Ｖ
字状に凹没させ、前記吸排気バルブ間のウオータ
ジヤケツトを略Ｖ字状に形成したことを特徴とす
るシリンダヘツドにおけるウオータジヤケツトの
構造。 In a cylinder head having a water jacket between the intake and exhaust valves, only the upper end of the water jacket near the center is approximately V along the camshaft direction.
A structure of a water jacket in a cylinder head, characterized in that the water jacket is recessed in a shape of a letter, and the water jacket between the intake and exhaust valves is formed in a substantially V-shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16951583U JPS6077752U (en) | 1983-10-31 | 1983-10-31 | Structure of water jacket in cylinder head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16951583U JPS6077752U (en) | 1983-10-31 | 1983-10-31 | Structure of water jacket in cylinder head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6077752U JPS6077752U (en) | 1985-05-30 |
| JPS645065Y2 true JPS645065Y2 (en) | 1989-02-08 |
Family
ID=30370315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16951583U Granted JPS6077752U (en) | 1983-10-31 | 1983-10-31 | Structure of water jacket in cylinder head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6077752U (en) |
-
1983
- 1983-10-31 JP JP16951583U patent/JPS6077752U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6077752U (en) | 1985-05-30 |
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