JPH0326245Y2 - - Google Patents
Info
- Publication number
- JPH0326245Y2 JPH0326245Y2 JP1984174611U JP17461184U JPH0326245Y2 JP H0326245 Y2 JPH0326245 Y2 JP H0326245Y2 JP 1984174611 U JP1984174611 U JP 1984174611U JP 17461184 U JP17461184 U JP 17461184U JP H0326245 Y2 JPH0326245 Y2 JP H0326245Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- valve seat
- cylinder head
- recess
- intake
- 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
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 description 9
- 239000000446 fuel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、内燃機関のシリンダヘツドにおい
て、互いに接近する吸気弁用弁シートと、排気弁
用弁シートとの間の部分（以下単に弁間部分と称
する）に生ずる亀裂を防止するための装置に関す
るものである。[Detailed description of the invention] [Field of industrial application] The present invention is directed to the cylinder head of an internal combustion engine, where the valve seat for an intake valve and the valve seat for an exhaust valve are close to each other (hereinafter simply referred to as the part between the valves). This invention relates to a device for preventing cracks occurring in parts (referred to as parts).
シリンダヘツドにおける弁間部分に発生する亀
裂を防止するために、先行技術として実公昭52−
9443号公報及び特開昭55−84809号は、第６図に
示すように、シリンダヘツド１０の下面のうち、
吸気弁用弁シート６０と排気弁用弁シート８０と
の間の弁間部分４０に、溝状の凹部９０を、吸気
弁用弁シート６０の外周と排気弁用弁シート８０
の外周とを互いに連通するように設けることによ
り、前記弁間部分４０を、吸気ポートからの吸気
にて積極的に冷却することを提案している。
In order to prevent cracks that occur between the valves in the cylinder head, the prior art
9443 and Japanese Patent Application Laid-Open No. 55-84809, as shown in FIG.
A groove-shaped recess 90 is formed in the intervalve portion 40 between the intake valve valve seat 60 and the exhaust valve valve seat 80, and a groove-shaped recess 90 is formed between the outer periphery of the intake valve valve seat 60 and the exhaust valve valve seat 80.
It is proposed that the intervalve portion 40 be actively cooled by intake air from the intake port by providing the outer periphery of the valve so as to communicate with each other.
しかし、この先行技術は、シリンダヘツド１０
の下面のうち前記弁間部分４０に設けた溝状凹部
９０の深さ寸法を、吸気弁用弁シート６０の外周
側と、排気弁用弁シート８０の外周側との両方に
おいて同じ深さ寸法に構成したものであるから、
当該溝状凹部９０には、吸気弁５０がその開き始
めるとき及び閉じる直前のときの両方の時期にお
いて弁シート６０から少し離れた状態になつたと
きに、低温の吸入混合気が実線矢印Ａで示すよう
に集中的に流れる一方、排気弁７０がその開き始
めるとき及び閉じる直前のときの両方の時期にお
いて弁シート８０から少し離れた状態になつたと
きに、高温の排気ガスが点線矢印Ｂで示すように
集中的に流れることになる。
However, in this prior art, the cylinder head 10
The depth of the groove-like recess 90 provided in the inter-valve portion 40 of the lower surface of the valve is the same on both the outer peripheral side of the intake valve valve seat 60 and the outer peripheral side of the exhaust valve valve seat 80. Since it is composed of
When the intake valve 50 is slightly away from the valve seat 60 both when the intake valve 50 begins to open and immediately before closing, the low-temperature intake air-fuel mixture flows into the groove-like recess 90 as indicated by the solid line arrow A. While the flow is concentrated as shown, when the exhaust valve 70 is slightly away from the valve seat 80 both when it starts to open and just before it closes, the high temperature exhaust gas flows as indicated by the dotted arrow B. As shown, the flow will be concentrated.
つまり、前記溝状凹部９０には、低温の吸入混
合気と高温の排気ガスとが相当の流速を持つて交
互に流れることになり、従つて、前記弁間部分４
０に対する熱負荷の繰り返しが大きくて弁間部分
の熱疲労が増大することになるから、前記弁間部
分の亀裂防止の効果が低いのであつた。 That is, the low-temperature intake air-fuel mixture and the high-temperature exhaust gas alternately flow through the groove-shaped recess 90 at a considerable flow velocity, and therefore the intervalve portion 4
Since the repetition of thermal load relative to 0 is large and thermal fatigue of the inter-valve portion increases, the effect of preventing cracks in the inter-valve portion is low.
本考案は、前記先行技術のように、シリンダヘ
ツドの下面のうち弁間部分に凹部を設けるにおい
て、該凹部には、主として低温の吸気混合気が流
れ、高温の排気ガスが流れるのを少なくすること
により、前記弁間部分に亀裂が発生することを確
実に防止できるようにすることを技術的課題とす
るものである。 The present invention provides a concave portion in the lower surface of the cylinder head between the valves, as in the prior art, in which mainly low-temperature intake air mixture flows, and high-temperature exhaust gas flows through the concave portion. Therefore, it is a technical problem to reliably prevent the occurrence of cracks in the portion between the valves.
この技術的課題を達成するため本考案は、吸気
ポートが燃焼室に開口する部分に吸気弁用の弁シ
ートを、排気ポートが開口する部分に排気弁用の
弁シートを、これら両弁シートの下面がシリンダ
ヘツドの下面からシリンダヘツド内に凹むように
して嵌着し、且つ、前記シリンダヘツドの下面の
うち前記両弁シート間の弁間部分に、凹部を、当
該凹部が前記吸気弁用弁シートの外周から前記排
気弁用弁シートの外周に向かつて延びるように設
けて成るシリンダヘツドにおいて、前記凹部のシ
リンダヘツド下面からの深さを、吸気弁用弁シー
ト側では深くする一方、排気弁用弁シート側では
浅くするか又は零にするように構成した。
In order to achieve this technical problem, the present invention provides a valve seat for the intake valve in the part where the intake port opens into the combustion chamber, a valve seat for the exhaust valve in the part where the exhaust port opens, and a valve seat for the exhaust valve in the part where the intake port opens into the combustion chamber. The cylinder head is fitted in such a way that its lower surface is recessed into the cylinder head from the lower surface of the cylinder head, and a recess is formed in the lower surface of the cylinder head at the portion between the valve seats between the two valve seats, and the recess is in contact with the valve seat for the intake valve. In a cylinder head provided to extend from the outer periphery toward the outer periphery of the exhaust valve valve seat, the depth of the recess from the lower surface of the cylinder head is increased on the intake valve valve seat side, while the exhaust valve On the seat side, the depth was configured to be shallow or zero.
シリンダヘツドの下面のうち弁間部分に設けら
れる凹部の深さを、前記のように、吸気弁用弁シ
ート側において深くしたことにより、この凹部内
には、吸気弁がその開き始めるとき及び閉じる直
前のときの両方の時期において弁シートから少し
離れた状態になつたときに、低温の吸入混合気を
積極的に導入できる一方、前記凹部の深さを、排
気弁用弁シート側において浅く又は零にしたこと
により、排気弁がその開き始めるとき及び閉じる
直前のときの両方の時期において弁シートから少
し離れた状態になつたときに、当該凹部に流入す
る排気ガスの量を、前記先行技術の場合よりも大
幅に低減することができる。
The depth of the recess provided in the part between the valves on the lower surface of the cylinder head is made deeper on the intake valve valve seat side as described above, so that when the intake valve starts to open and when it closes, the recess is deep. While it is possible to actively introduce the low-temperature intake air-fuel mixture when the valve seat is a little away from the valve seat at both times immediately before, the depth of the recess can be made shallower or smaller on the exhaust valve seat side. By setting the value to zero, the amount of exhaust gas that flows into the recess when the exhaust valve is slightly away from the valve seat both when it starts to open and just before it closes can be reduced compared to the prior art. This can be significantly reduced compared to the case of
つまり、前記凹部におけるシリンダヘツド下面
からの深さを、吸気弁用弁シート側では深くする
一方、排気弁用弁シート側では浅くするか又は零
にするように構成したことにより、当該凹部内へ
の高温の排気ガスの流入を低減し、凹部内に低温
の吸気混合気を積極的に導入できて、弁間部分に
対する低温の吸気混合気による冷却性を向上でき
るから、前記先行技術のように凹部に高温の排気
ガスと低温の吸気混合気とが交互に流れることに
よる熱負荷の繰り返しを、確実に低減できるので
ある。 In other words, by making the depth of the recess from the lower surface of the cylinder head deeper on the intake valve seat side, and shallower or zero on the exhaust valve seat side, the depth of the recess from the bottom surface of the cylinder head is increased. This reduces the inflow of high-temperature exhaust gas into the recess, actively introduces the low-temperature intake air mixture into the recess, and improves the cooling performance of the low-temperature intake air mixture for the area between the valves, unlike the prior art described above. This makes it possible to reliably reduce the repetitive heat load caused by the alternating flow of high-temperature exhaust gas and low-temperature intake air mixture into the recess.
従つて、本考案によると、弁間部分に凹部を設
けたことによつて生じる弁間部分の熱疲労の増大
がなく、熱疲労に伴う弁間部分の亀裂発生を確実
に低減できる効果を有する。 Therefore, according to the present invention, there is no increase in thermal fatigue of the inter-valve portion caused by providing a recess in the inter-valve portion, and it has the effect of reliably reducing the occurrence of cracks in the inter-valve portion due to thermal fatigue. .
以下、本考案の実施例を図面（第１図及び第２
図）について説明すると、図において符号１はシ
リンダヘツドを示し、該シリンダヘツド１には、
吸気ポート２と排気ポート３とが、これら両ポー
ト２，３の燃焼室への開口部の間に弁間部分４を
有するようにして形成されている。
Examples of the present invention are shown in the drawings (Fig. 1 and 2) below.
In the figure, reference numeral 1 indicates a cylinder head, and the cylinder head 1 includes:
An intake port 2 and an exhaust port 3 are formed with an intervalve portion 4 between the openings of these ports 2, 3 into the combustion chamber.
前記吸気ポート２の燃焼室への開口部には、吸
気弁５用の弁シート６が、排気ポート３の燃焼室
への開口部には、排気弁７用の弁シート８が、こ
れら両弁シート６，８の下面がシリンダヘツド１
の下面１ａからシリンダヘツド１内に適宜深さＨ
凹んだ位置に嵌着されている（但し、この両弁シ
ート６，８は、シリンダヘツドの鋳造時において
同時にシリンダヘツド内に鋳込むようにしても良
い）。 A valve seat 6 for the intake valve 5 is located at the opening of the intake port 2 to the combustion chamber, and a valve seat 8 for the exhaust valve 7 is located at the opening of the exhaust port 3 to the combustion chamber. The bottom surface of seats 6 and 8 is cylinder head 1
Appropriate depth H from the bottom surface 1a of the cylinder head 1
(However, both valve seats 6 and 8 may be cast into the cylinder head at the same time when the cylinder head is cast.)
そして、前記シリンダヘツド１の下面１ａのう
ち前記弁間部分４の位置に、溝状の凹部９を、当
該凹部９が前記吸気弁用弁シート６の外周から前
記排気弁用弁シート８の外周に向かつて延びるよ
うに設けるにおいて、該凹部９のシリンダヘツド
下面１ａからの深さを、吸気弁用弁シート６側に
おいては深い寸法h1に、排気弁用弁シート８側に
おいて浅い寸法h2に構成する。 A groove-shaped recess 9 is formed in the lower surface 1a of the cylinder head 1 at the position of the inter-valve portion 4, so that the recess 9 extends from the outer periphery of the intake valve valve seat 6 to the outer periphery of the exhaust valve valve seat 8. The depth of the recess 9 from the lower surface 1a of the cylinder head is set to a deep dimension h 1 on the intake valve valve seat 6 side and a shallow dimension h 2 on the exhaust valve valve seat 8 side. Configure.
なお、この場合において、前記凹部９の深さ
を、第３図に示すように排気弁用弁シート８側に
おいて零になるように、換言すると、凹部９を、
当該凹部９における排気弁用弁シート８側の終端
が排気弁用弁シート８に近接した部位に位置する
ように構成しても良いのである。 In this case, the depth of the recess 9 is set to zero on the exhaust valve seat 8 side as shown in FIG.
The terminal end of the recess 9 on the exhaust valve seat 8 side may be located at a location close to the exhaust valve seat 8.
このように凹部９のシリンダヘツド下面１ａか
らの深さを、吸気弁用弁シート６側においては深
い寸法h1に構成したことにより、吸気ポート２か
ら燃焼室に流入する吸気混合気を、吸気弁５が第
１図に示すようにその開き始めるとき及び閉じる
直前のときの両方の時期において弁シート６から
少し離れた状態になつたときに、前記凹部９内に
積極的に導くことができる一方、前記凹部９のシ
リンダヘツド下面１ａからの深さを、排気弁用弁
シート８側において浅い寸法h2又は零に構成した
ことにより、排気弁７が第１図に示すようにその
開き始めるとき及び閉じる直前のときの両方の時
期において弁シート８から少し離れた状態になつ
たときに、前記凹部９に流入する排気ガスの量
を、大幅に低減することができるのであり、換言
すると、前記凹部９内への高温の排気ガスの流入
を低減して、凹部９内に低温の吸気混合気を積極
的に導入することができるのである。 By configuring the depth of the recess 9 from the lower surface 1a of the cylinder head to the deep dimension h1 on the side of the intake valve seat 6, the intake air-fuel mixture flowing into the combustion chamber from the intake port 2 is As shown in FIG. 1, when the valve 5 is slightly separated from the valve seat 6 both when it starts to open and just before it closes, it can be actively guided into the recess 9. On the other hand, by configuring the depth of the recess 9 from the lower surface 1a of the cylinder head to a shallow dimension h2 or zero on the side of the exhaust valve valve seat 8, the exhaust valve 7 begins to open as shown in FIG. It is possible to significantly reduce the amount of exhaust gas flowing into the recess 9 when the valve seat 8 is slightly away from the valve seat 8 both when the recess 9 is closed and immediately before closing. This makes it possible to reduce the inflow of high temperature exhaust gas into the recess 9 and actively introduce low temperature intake air mixture into the recess 9.
なお、前記実施例は、凹部９を溝状にした場合
であつたが、凹部を溝状にすることに代えて、第
４図及び第５図に示すように平面において円弧状
の周輪郭９a′を有する凹部９ａに形成しても良
く、また、凹部の底面を前記各実施例のように傾
斜状に形成することに代えて、第３図に二点鎖線
Ｃで示すように、段を有する凹部９ｂに構成して
も良いのである。 In the above-mentioned embodiment, the recess 9 was formed into a groove shape, but instead of forming the recess into a groove shape, a circumferential contour 9a having an arcuate shape in a plane as shown in FIGS. 4 and 5 was used. Also, instead of forming the bottom surface of the recess in an inclined shape as in each of the above embodiments, the bottom surface of the recess may be formed with steps as shown by the two-dot chain line C in FIG. It may also be configured in the recessed portion 9b.
第１図は本考案の第１実施例を示すシリンダヘ
ツドの要部縦断正面図、第２図は第１図の底面
図、第３図は本考案の第２実施例を示すシリンダ
ヘツドの要部縦断正面図、第４図は本考案の第３
実施例を示すシリンダヘツドの要部縦断正面図、
第５図は第４図の底面図、第６図は従来のものを
示すシリンダヘツドの要部縦断正面図である。
１……シリンダヘツド、２……吸気ポート、３
……排気ポート、４…弁間部分、５……吸気弁、
６……吸気弁用弁シート、７……排気弁、８……
排気弁用弁シート、９，１９ａ，９ｂ……凹部。
FIG. 1 is a longitudinal sectional front view of the main parts of a cylinder head showing a first embodiment of the present invention, FIG. 2 is a bottom view of FIG. 1, and FIG. 3 is a main part of a cylinder head showing a second embodiment of the present invention. Fig. 4 is a vertical sectional front view of the third part of the present invention.
A longitudinal sectional front view of a main part of a cylinder head showing an embodiment,
FIG. 5 is a bottom view of FIG. 4, and FIG. 6 is a longitudinal sectional front view of a main part of a conventional cylinder head. 1...Cylinder head, 2...Intake port, 3
...exhaust port, 4...portion between valves, 5...intake valve,
6... Valve seat for intake valve, 7... Exhaust valve, 8...
Valve seat for exhaust valve, 9, 19a, 9b... recessed portion.
Claims (1)
の弁シートを、排気ポートが開口する部分に排気
弁用の弁シートを、これら両弁シートの下面がシ
リンダヘツドの下面からシリンダヘツド内に凹む
ようにして嵌着し、且つ、前記シリンダヘツドの
下面のうち前記両弁シート間の弁間部分に、凹部
を、当該凹部が前記吸気弁用弁シートの外周から
前記排気弁用弁シートの外周に向かつて延びるよ
うに設けて成るシリンダヘツドにおいて、前記凹
部のシリンダヘツド下面からの深さを、吸気弁用
弁シート側では深くする一方、排気弁用弁シート
側では浅くするか又は零にするように構成したこ
とを特徴とするシリンダヘツドにおける弁間亀裂
の防止装置。 A valve seat for the intake valve is placed in the part where the intake port opens into the combustion chamber, a valve seat for the exhaust valve is placed in the part where the exhaust port opens, and the lower surfaces of both valve seats are recessed into the cylinder head from the lower surface of the cylinder head. and a recess is formed in the lower surface of the cylinder head at a portion between the valve seats, with the recess extending from the outer periphery of the intake valve valve seat toward the outer periphery of the exhaust valve seat. In a cylinder head that is provided in an extending manner, the depth of the recess from the lower surface of the cylinder head is made deeper on the intake valve seat side, and shallower or zero on the exhaust valve seat side. A device for preventing intervalve cracks in a cylinder head, characterized by comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984174611U JPH0326245Y2 (en) | 1984-11-16 | 1984-11-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984174611U JPH0326245Y2 (en) | 1984-11-16 | 1984-11-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6191045U JPS6191045U (en) | 1986-06-13 |
| JPH0326245Y2 true JPH0326245Y2 (en) | 1991-06-06 |
Family
ID=30732229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984174611U Expired JPH0326245Y2 (en) | 1984-11-16 | 1984-11-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0326245Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5381913B2 (en) * | 2010-06-29 | 2014-01-08 | マツダ株式会社 | Engine cylinder head structure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5584809A (en) * | 1978-12-18 | 1980-06-26 | Hino Motors Ltd | Arrangement for cooling exhaust valve of internal combustion engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58177546U (en) * | 1982-05-24 | 1983-11-28 | 日産ディーゼル工業株式会社 | Combustion chamber of internal combustion engine |
-
1984
- 1984-11-16 JP JP1984174611U patent/JPH0326245Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5584809A (en) * | 1978-12-18 | 1980-06-26 | Hino Motors Ltd | Arrangement for cooling exhaust valve of internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6191045U (en) | 1986-06-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS6149120A (en) | 4 stroke internal-combustion engine | |
| JPH0326245Y2 (en) | ||
| JP2917274B2 (en) | 4-cycle engine cylinder head | |
| JPS6213759A (en) | Cooling water passage structure in cylinder head for internal-combustion engine | |
| JPS58101216A (en) | Internal-combustion engine | |
| JPH0244019Y2 (en) | ||
| JPH0115881Y2 (en) | ||
| JPH085319Y2 (en) | Engine cylinder head structure | |
| JPS5840258Y2 (en) | Combustion chamber of internal combustion engine | |
| JPH0234445Y2 (en) | ||
| JPH0134678Y2 (en) | ||
| JP2565322Y2 (en) | Cylinder head structure of direct injection diesel engine | |
| JPH0313550Y2 (en) | ||
| JPS6027798Y2 (en) | cylinder head of internal combustion engine | |
| JPS594521B2 (en) | Internal combustion engine exhaust valve cooling system | |
| JPS5856355Y2 (en) | 3-valve cylinder head | |
| JPS5852344Y2 (en) | 3-valve cylinder head | |
| JP3329405B2 (en) | Intake control structure for two-valve engine | |
| JPH018657Y2 (en) | ||
| JPS5847237Y2 (en) | Cylinder block of side valve type internal combustion engine | |
| JPH0235143B2 (en) | ||
| JPH10122038A (en) | Cylinder head structure | |
| JPS5856331Y2 (en) | Internal combustion engine with dual intake device | |
| JPH0238051Y2 (en) | ||
| JPS5851386Y2 (en) | cylinder head of internal combustion engine |