JPS6349526Y2 - - Google Patents
Info
- Publication number
- JPS6349526Y2 JPS6349526Y2 JP4275683U JP4275683U JPS6349526Y2 JP S6349526 Y2 JPS6349526 Y2 JP S6349526Y2 JP 4275683 U JP4275683 U JP 4275683U JP 4275683 U JP4275683 U JP 4275683U JP S6349526 Y2 JPS6349526 Y2 JP S6349526Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- seat
- exhaust valve
- exhaust
- base material
- 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
- 239000000463 material Substances 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 239000011344 liquid material Substances 0.000 claims 1
- 239000000567 combustion gas Substances 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 229910001347 Stellite Inorganic materials 0.000 description 3
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000007373 indentation Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Lift Valve (AREA)
Description
【考案の詳細な説明】 本考案は内燃機関の吸、排気弁に関する。[Detailed explanation of the idea] The present invention relates to intake and exhaust valves for internal combustion engines.
第１図は従来の内燃機関の排気弁の要部を示す
断面図である。図において、排気弁ａは、高温、
高圧の燃焼ガスまたは排ガスにさらされて、高温
の強い腐食環境下にあり、またそのシート部分３
は排気弁座ｂのシート部分７と頻繁に接離を繰返
えし摩耗しやすくなつているため、一般に排気弁
ａのシート部分３には耐腐食性、耐摩耗性を有す
る材料が要求され、ステム部１、傘部２で構成さ
れる弁母材の材料よりも硬いステライト等のシー
ト部材４が肉盛りされている。 FIG. 1 is a sectional view showing the main parts of a conventional exhaust valve for an internal combustion engine. In the figure, exhaust valve a has a high temperature,
The seat portion 3 is exposed to high pressure combustion gas or exhaust gas and is in a high temperature and highly corrosive environment.
The seat part 3 of the exhaust valve a is generally required to be made of a corrosion-resistant and abrasion-resistant material, because the seat part 7 of the exhaust valve seat b is frequently brought into contact with and separated from the seat part 7 of the exhaust valve seat b, and is prone to wear. A sheet member 4 made of stellite or the like which is harder than the material of the valve base material constituted by the stem part 1 and the cap part 2 is built up.
ところで、内燃機関の排気弁においては、機関
の高負荷運転中に前記のシート部材４が燃焼ガス
または排ガスにより加熱され高温になり、硬度が
低下し、耐摩耗性、耐腐食性が低下すると共に、
排気弁座ｂのシート部分７に着座した際に、排ガ
ス中に混在している燃焼残渣をそのシート面４′
上に咬込んで圧痕（凹み）を生じることがあり、
その圧痕がシート部材４の巾方向（矢印Ｚ方向）
に連続したり、圧痕が拡大すると、弁着座時に燃
焼ガスが、この圧痕による弁シート部の隙間から
吹き抜けて弁の気密性が損われることになる。そ
こで従来の排気弁ａにおいては、硬いステライト
等をシート部材４として使用すると共に、更に排
気弁座ｂに設けた冷却孔６に冷却水を通して、排
気弁座ｂのシート部分７を介して排気弁ａのシー
ト部材４の温度を低下し、その硬度の低下を防止
するようにしている。しかし、燃焼ガスの影響を
広範囲にわたつて受ける弁の傘部２からの熱伝導
により、シート部材４は温度が上昇する。 By the way, in the exhaust valve of an internal combustion engine, the sheet member 4 is heated by combustion gas or exhaust gas during high-load operation of the engine and reaches a high temperature, resulting in a decrease in hardness, a decrease in wear resistance, and a decrease in corrosion resistance. ,
When sitting on the seat portion 7 of the exhaust valve seat b, the combustion residue mixed in the exhaust gas is removed from the seat surface 4'.
It may bite into the upper part and cause an impression (dent).
The impression is in the width direction of the sheet member 4 (arrow Z direction)
If the indentation continues or the indentation expands, the combustion gas will blow through the gap in the valve seat caused by the indentation when the valve is seated, and the airtightness of the valve will be impaired. Therefore, in the conventional exhaust valve a, a hard Stellite or the like is used as the seat member 4, and cooling water is passed through the cooling hole 6 provided in the exhaust valve seat b, and the exhaust valve is passed through the seat part 7 of the exhaust valve seat b. The temperature of the sheet member 4 of a is lowered to prevent a decrease in its hardness. However, the temperature of the sheet member 4 rises due to heat conduction from the valve head portion 2, which is widely affected by the combustion gas.
特に最近のように、内燃機関が高出力化される
と燃焼室の熱負荷が増大し、さらに燃料油の粗悪
化による燃焼残渣物が増加する傾向にあり、排気
弁ａのシート部材４のシート面４′における前記
のように吹き抜けが生じ易くなつており、その防
止策が必要である。 In particular, as internal combustion engines have been increasing in output recently, the heat load on the combustion chamber has increased, and combustion residues have also tended to increase due to deterioration of fuel oil. As mentioned above, blow-throughs are likely to occur on the surface 4', and measures to prevent such blow-throughs are required.
燃焼ガスの影響を受ける吸気弁についても、排
気弁と同様な対策が必要である。 Intake valves, which are affected by combustion gases, require the same countermeasures as exhaust valves.
特に、弁シート部の吹き抜けは、弁周方向の燃
焼ガスからの不均一な加熱による弁シート部の局
部的な温度上昇が大きく影響し、弁シート部温度
の均一性が吹き抜け防止に役立つ。また弁周方向
の不均一な温度分布は弁の変形を招き、吹き抜け
を起しやすくなる。 In particular, blow-through in the valve seat portion is greatly affected by a local temperature rise in the valve seat portion due to non-uniform heating from combustion gas in the circumferential direction of the valve, and uniformity of the valve seat temperature helps to prevent blow-through. In addition, uneven temperature distribution in the circumferential direction of the valve causes deformation of the valve, making it more likely to cause blow-through.
本考案の目的は上記問題点を解決するため、弁
のシート部分における温度を低下せしめると共に
局部的な温度上昇を防止できる吸、排気弁を提供
することであり、その特徴とするところは、弁の
シート部分の全周面にわたつて弁母材よりも硬い
シート部材を装着すると共に、上記シート部材と
弁母材との境界部分の環状の空隙を設け、同空隙
内に熱媒体として液状体を封入したことである。 The purpose of the present invention is to provide an intake/exhaust valve that can reduce the temperature at the seat part of the valve and prevent local temperature increases, in order to solve the above problems. A sheet member harder than the valve base material is installed over the entire circumferential surface of the seat part, and an annular gap is provided at the boundary between the seat member and the valve base material, and a liquid is placed as a heat medium in the gap. This is because it has been enclosed.
この場合は、上記空隙による断熱作用のみなら
ずこの空隙に封入された熱媒体が、弁の上下方向
及び周方向の動きにより流動して、弁周方向の局
部的な高温部から低温部へと熱移動することによ
り、弁周方向の温度を均一化して、弁の局部的な
温度上昇を防止できる。従つてシート部材の硬度
が維持され、その耐摩耗性、耐腐食性によつて弁
着座時における吹き抜けが防止され、弁の耐久性
が著しく向上する。 In this case, not only the heat insulating effect of the above-mentioned voids but also the heat medium sealed in the voids flow due to the vertical and circumferential movement of the valve, from the locally high temperature area to the low temperature area in the circumferential direction of the valve. By transferring heat, it is possible to equalize the temperature in the circumferential direction of the valve and prevent a local temperature rise in the valve. Therefore, the hardness of the seat member is maintained, and its abrasion resistance and corrosion resistance prevent blow-through when the valve is seated, and the durability of the valve is significantly improved.
以下図面を参照して本考案による実施例につき
説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第２図は本考案による１実施例の排気弁の要部
を示す断面である。 FIG. 2 is a cross-sectional view showing essential parts of an exhaust valve according to an embodiment of the present invention.
図において、１２は排気弁の傘部、１３は傘部
１２の周辺のシート部分、１４はシート部分１３
の全周面にわたつて装着された弁母材よりも硬い
ステライト等の材料よりなるシート部材、１４′
はシート部材１４のシート面、ｂは排気弁座、６
は排気弁座ｂ中に設けられた冷却水を通す冷却
孔、７は排気弁座ｂのシート部材である。 In the figure, 12 is the umbrella part of the exhaust valve, 13 is the seat part around the umbrella part 12, and 14 is the seat part 13.
A sheet member made of a material such as stellite that is harder than the valve base material and is attached over the entire circumference of the valve base material, 14'
is the seat surface of the seat member 14, b is the exhaust valve seat, 6
7 is a cooling hole provided in the exhaust valve seat b through which cooling water passes, and 7 is a seat member of the exhaust valve seat b.
１５は環状の空隙で、排気弁のシート部分１３
の全周面にわたつて装着されたシート部材１４と
弁母材のシート部分１３との境界部分に設けられ
ている。空隙１５内には熱媒体１６が封入されて
いる。熱媒体１６は水または油または溶融金属が
用いられる。 15 is an annular gap, which is the seat part 13 of the exhaust valve.
It is provided at the boundary between the seat member 14 attached over the entire circumferential surface of the valve base material and the seat portion 13 of the valve base material. A heat medium 16 is sealed in the cavity 15 . Water, oil, or molten metal is used as the heat medium 16.
上記構成の場合の作用、効果について述べる。 The functions and effects of the above configuration will be described.
空隙１５により断熱作用を行うのみならず、こ
の空隙に封入された熱媒体が、弁の開閉による上
下方向の運動または弁の周方向の回転により、流
動することにより、弁傘部から不均一にシート部
１３に流入した熱による弁周方向の局部的な高温
部から低温部へと熱移動することにより、弁シー
ト部１３の周方向の温度が均一化され、弁の局部
的な温度上昇を防止する。 Not only does the gap 15 provide a heat insulating effect, but the heat medium sealed in this gap flows due to vertical movement due to the opening and closing of the valve or rotation in the circumferential direction of the valve, so that it is unevenly distributed from the valve head. As the heat flowing into the seat portion 13 moves from a local high-temperature area to a low-temperature area in the circumferential direction of the valve, the temperature in the circumferential direction of the valve seat portion 13 is made uniform, thereby preventing a local temperature rise in the valve. To prevent.
これらの作用により、シート部材の硬度が維持
されその耐摩耗性、耐腐食性によつて、弁着座時
における吹き抜けが防止され弁の耐久性が著しく
向上する。 These actions maintain the hardness of the seat member, and its wear and corrosion resistance prevents blow-through when the valve is seated, significantly improving the durability of the valve.
第１図は従来の排気弁の要部を示す断面図、第
２図は本考案による１実施例の排気弁の要部を示
す断面図である。
１２……排気弁の傘部、１３……排気弁のシー
ト部、１４……シート部材、１５……環状の空
隙、１６……熱媒体。
FIG. 1 is a sectional view showing the main parts of a conventional exhaust valve, and FIG. 2 is a sectional view showing the main parts of an exhaust valve according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 12... Umbrella part of exhaust valve, 13... Seat part of exhaust valve, 14... Seat member, 15... Annular gap, 16... Heat medium.
Claims (1)
も硬いシート部材を装着すると共に、上記シート
部材と弁母材との境界部分に環状の空隙を設け、
同空隙内に熱媒体としての液状体を封入したこと
を特徴とする内燃機関の吸、排気弁。 A seat member harder than the valve base material is installed over the entire circumferential surface of the seat portion of the valve, and an annular gap is provided at the boundary between the seat member and the valve base material,
An intake/exhaust valve for an internal combustion engine, characterized in that a liquid material as a heat medium is sealed in the gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4275683U JPS59148404U (en) | 1983-03-26 | 1983-03-26 | Internal combustion engine intake and exhaust valves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4275683U JPS59148404U (en) | 1983-03-26 | 1983-03-26 | Internal combustion engine intake and exhaust valves |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59148404U JPS59148404U (en) | 1984-10-04 |
| JPS6349526Y2 true JPS6349526Y2 (en) | 1988-12-20 |
Family
ID=30173292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4275683U Granted JPS59148404U (en) | 1983-03-26 | 1983-03-26 | Internal combustion engine intake and exhaust valves |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59148404U (en) |
-
1983
- 1983-03-26 JP JP4275683U patent/JPS59148404U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59148404U (en) | 1984-10-04 |
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