JP4690369B2 - Valve for internal combustion engine - Google Patents

Valve for internal combustion engine Download PDF

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JP4690369B2
JP4690369B2 JP2007206965A JP2007206965A JP4690369B2 JP 4690369 B2 JP4690369 B2 JP 4690369B2 JP 2007206965 A JP2007206965 A JP 2007206965A JP 2007206965 A JP2007206965 A JP 2007206965A JP 4690369 B2 JP4690369 B2 JP 4690369B2
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valve
internal combustion
bundle
combustion engine
umbrella
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JP2009041439A (en
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孝男 鈴木
啓裕 伊原
政男 石田
清行 川合
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Toyota Motor Corp
Eneos Corp
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Toyota Motor Corp
JX Nippon Oil and Energy Corp
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Description

本発明は、排気バルブ、吸気バルブ等の内燃機関用バルブに関する。   The present invention relates to an internal combustion engine valve such as an exhaust valve and an intake valve.

排気バルブや吸気バルブ等の内燃機関用バルブの内部に中空部を形成し、この中空部に冷却媒体を収容するとともに、熱伝導部材を設けたものが知られている（例えば、特許文献１，2等参照）。   Known is one in which a hollow portion is formed inside an internal combustion engine valve such as an exhaust valve or an intake valve, a cooling medium is accommodated in the hollow portion, and a heat conducting member is provided (for example, Patent Document 1, Patent Document 1). (See 2nd grade).

特開昭５８−１０１０５号公報JP 58-10105 A 特開昭６０−８４７０５号公報JP 60-84705 A

ところで、上記のような中空バルブでは、放熱部材の熱入力面積が狭く、冷却効果が低いという問題があり、さらなる冷却性能の強化やバルブの耐久性の向上への要請があった。   By the way, the hollow valve as described above has a problem that the heat input area of the heat radiating member is narrow and the cooling effect is low, and there has been a demand for further enhancement of cooling performance and improvement of durability of the valve.

本発明は、上記の事情に鑑みて成されたものであり、その目的とするところは、冷却性能、耐久性をさらに向上可能な内燃機関用バルブを提供することにある。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a valve for an internal combustion engine that can further improve cooling performance and durability.

本発明は、内燃機関の吸気バルブ又は排気バルブとして使用され、傘部と前記傘部に続くステム部とを有し、前記傘部から前記ステム部にかけて中空部が形成されているとともに、前記中空部の少なくとも一部に冷媒が封入された内燃機関用バルブであって、繊維長手方向に高熱伝導率を有する炭素繊維強化金属の束が前記中空部内に前記冷媒に接触するように設けられ、前記炭素繊維強化金属の束の繊維長手方向における一端部が前記傘部の先端部を構成するキャプ部の内面に接触している、ことを特徴とする。   The present invention is used as an intake valve or an exhaust valve of an internal combustion engine, and has an umbrella part and a stem part following the umbrella part, and a hollow part is formed from the umbrella part to the stem part. A valve for an internal combustion engine in which a refrigerant is sealed in at least a part of a portion, a bundle of carbon fiber reinforced metal having high thermal conductivity in a fiber longitudinal direction is provided in the hollow portion so as to contact the refrigerant, One end portion of the bundle of carbon fiber reinforced metals in the fiber longitudinal direction is in contact with the inner surface of the cap portion constituting the tip portion of the umbrella portion.

この構成によれば、炭素繊維強化金属の高熱伝導率を利用し、傘部の先端部を構成するキャップ部の熱を比較的温度の低いステム部側へ放熱することができる。キャップ部は、最も高温、高応力となるので、これに炭素繊維強化金属の束の一端部を接触させることで、キャップ部の低温化、低応力化が可能となり、冷却性能、耐久性が向上した内燃機関用バルブが得られる。   According to this structure, the heat of the cap part which comprises the front-end | tip part of an umbrella part can be thermally radiated to the stem part side with comparatively low temperature using the high thermal conductivity of a carbon fiber reinforced metal. The cap part has the highest temperature and the highest stress. By bringing one end of the bundle of carbon fiber reinforced metal into contact with this, the cap part can be lowered in temperature and stress can be reduced, improving the cooling performance and durability. An internal combustion engine valve is obtained.

上記構成において、前記炭素繊維強化金属の束の繊維長手方向における他端部が、バルブガイド近傍の前記ステム部の内部に接続されている、構成を採用できる。また、前記冷媒は、前記傘部の内部に収容されている、構成を採用できる。   The said structure WHEREIN: The structure by which the other end part in the fiber longitudinal direction of the bundle | flux of the said carbon fiber reinforced metal is connected to the inside of the said stem part of the valve guide vicinity is employable. Moreover, the structure with which the said refrigerant | coolant is accommodated in the inside of the said umbrella part is employable.

上記構成において、前記炭素繊維強化金属の束の繊維の長手方向における他端部が、前記傘部の先端部を構成する下部キャップ部の内面に接触している、構成を採用できる。また、前記冷媒は、前記ステム部の先端側の内部に収容されている、構成を採用できる。   The said structure WHEREIN: The structure which the other end part in the longitudinal direction of the fiber of the said bundle of carbon fiber reinforced metal is contacting the inner surface of the lower cap part which comprises the front-end | tip part of the said umbrella part is employable. Moreover, the structure with which the said refrigerant | coolant is accommodated in the inside of the front end side of the said stem part is employable.

本発明によれば、冷却性能、耐久性が一層向上した内燃機関用バルブが得られる。   According to the present invention, a valve for an internal combustion engine with further improved cooling performance and durability can be obtained.

以下、本発明の最良の実施形態について、添付図面を参照しつつ説明する。   DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.

図１及び図２は本発明の一実施形態を示す図であって、図１は本発明の一実施形態に係る内燃機関用バルブ（以下、中空バルブという）の断面図、及び図２は図１のＡ部の拡大図である。   1 and 2 are views showing an embodiment of the present invention. FIG. 1 is a sectional view of an internal combustion engine valve (hereinafter referred to as a hollow valve) according to an embodiment of the present invention, and FIG. FIG.

中空バルブ１０は、内燃機関の吸気バルブ又は排気バルブとして使用される。中空バルブ１０は、図１に示すように、バルブシート２０ｓを備える傘部２０と、この傘部２０に続くバルブガイド７０によりガイドされるステム部３０とを有し、傘部２０からステム部３０にかけて中空部４０が形成されている。この中空部４０は、傘部２０の先端部を構成する円盤状のキャプ部２１により塞がれている。そして、傘部２０側の中空部４０には、金属ナトリウム等の冷媒６０が封入されている。   The hollow valve 10 is used as an intake valve or an exhaust valve of an internal combustion engine. As shown in FIG. 1, the hollow valve 10 includes an umbrella portion 20 including a valve seat 20 s and a stem portion 30 guided by a valve guide 70 following the umbrella portion 20. A hollow portion 40 is formed over the top. The hollow portion 40 is closed by a disk-shaped cap portion 21 that constitutes the distal end portion of the umbrella portion 20. The hollow portion 40 on the umbrella portion 20 side is filled with a coolant 60 such as metallic sodium.

中空部４０には、ＣＦＲＭ（炭素繊維強化金属）束５０が設けられている。
ＣＦＲＭ束５０は、例えば、炭素繊維のもつ高強度、高弾性、高張力を生かし、主にエポキシ樹脂を含浸させ、プリプレグにし、アルミ、チタンなどの軽金属をコアにし、巻き付けた強化金属または金属とプリプレグとの反応劣化を防ぐ表面処理を施して得られ、繊維長手方向に高熱伝導率を有する。 The hollow portion 40 is provided with a CFRM (carbon fiber reinforced metal) bundle 50.
The CFRM bundle 50 is made of, for example, a high strength, high elasticity, and high tension of a carbon fiber, mainly impregnated with an epoxy resin, made into a prepreg, a light metal such as aluminum or titanium as a core, It is obtained by applying a surface treatment that prevents reaction deterioration with the prepreg, and has a high thermal conductivity in the fiber longitudinal direction.

このＣＦＲＭ束５０は、冷媒６０に接触するように設けられているとともに、ＣＦＲＭ束５０の繊維長手方向における一端部がキャプ部２１の内面（キャップ部２１の略中心部）に接触している。   The CFRM bundle 50 is provided so as to be in contact with the refrigerant 60, and one end portion in the fiber longitudinal direction of the CFRM bundle 50 is in contact with the inner surface of the cap portion 21 (substantially central portion of the cap portion 21).

また、ＣＦＲＭ束５０は、その他端部５０ｅが、図２に示すように、バルブガイド７０近傍のステム部３０の内部３０ｆに接続されている。   The other end 50e of the CFRM bundle 50 is connected to the interior 30f of the stem 30 near the valve guide 70 as shown in FIG.

上記構成に中空バルブ１０では、ＣＦＲＭ束５０は、繊維長手方向において高熱伝導率を有するので、高温となるキャプ部２１の熱は、ＣＦＲＭ束５０を伝って、比較的温度の低いバルブガイド７０側へ効率よく伝達される。すなわち、キャプ部２１とバルブガイド７０側のステム部３０との間の温度勾配は大きく、キャプ部２１の熱がバルブガイド７０側へ効率良く放熱される。   In the hollow valve 10 having the above-described configuration, the CFRM bundle 50 has high thermal conductivity in the fiber longitudinal direction. Therefore, the heat of the cap portion 21 that becomes high temperature passes through the CFRM bundle 50 and is relatively low in the valve guide 70 side. To be transmitted efficiently. That is, the temperature gradient between the cap portion 21 and the stem portion 30 on the valve guide 70 side is large, and the heat of the cap portion 21 is efficiently radiated to the valve guide 70 side.

また、傘部２０側の中空部４０には、冷媒６０が封入されているので、この冷媒６０により、傘部２０（のバルブシート２０ｓ）からの放熱が促進される。   Moreover, since the refrigerant | coolant 60 is enclosed in the hollow part 40 by the side of the umbrella part 20, the thermal radiation from the umbrella part 20 (the valve seat 20s) is accelerated | stimulated by this refrigerant | coolant 60. FIG.

さらに、ＣＦＲＭ束５０が配設されていることにより、中空部４０のステム部３０側は、ＣＦＲＭ束５０により閉塞されているので、冷媒６０が、中空部４０のステム部３０側へ移動しにくくなり、バルブシート２０ｓからの放熱がより促進される。   Furthermore, since the CFRM bundle 50 is disposed, the stem portion 30 side of the hollow portion 40 is closed by the CFRM bundle 50, so that the refrigerant 60 hardly moves to the stem portion 30 side of the hollow portion 40. Thus, heat dissipation from the valve seat 20s is further promoted.

以上のように、最も大きな応力が発生し、温度も高くなるキャップ部２１の中心部は、ＣＦＲＭ束５０を設けることにより、応力を緩和できるとともに、温度を下げることができる。   As described above, by providing the CFRM bundle 50, the center portion of the cap portion 21 where the greatest stress is generated and the temperature is high can relieve the stress and reduce the temperature.

ここで、中空バルブ１０の冷却性能について図３を参照してい説明すると、図３において、比較例として（２）に示す中実バルブの場合には、排気ポートにおける傘部の温度が８００℃程度であり、比較例として（３）に示す中空バルブと冷媒とを組み合わせたバルブの場合には、６５０℃程度である。   Here, the cooling performance of the hollow valve 10 will be described with reference to FIG. 3. In FIG. 3, in the case of the solid valve shown in (2) as a comparative example, the temperature of the umbrella portion in the exhaust port is about 800 ° C. In the case of a valve in which the hollow valve and the refrigerant shown in (3) are combined as a comparative example, the temperature is about 650 ° C.

一方、（１）に示す本実施形態に係る中空バルブ１０の場合、６００℃程度となり、冷却性能が向上することが分かる。   On the other hand, in the case of the hollow valve 10 according to the present embodiment shown in (1), it is about 600 ° C. and it can be seen that the cooling performance is improved.

次に、図４を参照して本発明の他の実施形態に係る内燃機関用バルブについて説明する。   Next, an internal combustion engine valve according to another embodiment of the present invention will be described with reference to FIG.

図４は、本発明の他の実施形態に係る内燃機関用バルブの断面図である。尚、図４において、上記実施形態と同一構成部分には同一の符号を使用している。   FIG. 4 is a cross-sectional view of a valve for an internal combustion engine according to another embodiment of the present invention. In FIG. 4, the same reference numerals are used for the same components as in the above embodiment.

図４に示す中空バルブ１０Ａは、その中空部４０に設けられたＣＦＲＭ束５０Ａが、図１に示したＣＦＲＭ束５０よりも短縮化されるとともに、冷媒６０がＣＦＲＭ束５０Ａの他端部上のステム部３０の先端側の内部に収容されている。尚、冷媒６０は、傘部２０側の中空部４０にも収容することができる。   In the hollow valve 10A shown in FIG. 4, the CFRM bundle 50A provided in the hollow portion 40 is shortened than the CFRM bundle 50 shown in FIG. 1, and the refrigerant 60 is on the other end of the CFRM bundle 50A. The stem portion 30 is housed inside the distal end side. The refrigerant 60 can also be accommodated in the hollow part 40 on the umbrella part 20 side.

本実施形態では、比較的比重の大きいＣＦＲＭ束５０Ａを小型化することにより、バルブ全体の軽量化を図ることができる。また、冷媒６０をステム部３０の先端側の内部に収容することにより、ＣＦＲＭ束５０Ａから伝わる熱を図示しないロッカーアームやバルブ側へ逃がすことが可能になる。   In the present embodiment, the weight of the entire valve can be reduced by downsizing the CFRM bundle 50A having a relatively large specific gravity. Further, by accommodating the refrigerant 60 inside the stem portion 30, the heat transmitted from the CFRM bundle 50A can be released to a rocker arm or a valve side (not shown).

次に、図５を参照して本発明のさらに他の実施形態に係る内燃機関用バルブについて説明する。尚、図５において、上記実施形態と同一構成部分には同一の符号を使用している。   Next, an internal combustion engine valve according to still another embodiment of the present invention will be described with reference to FIG. In FIG. 5, the same reference numerals are used for the same components as in the above embodiment.

図５に示す中空バルブ１０Ｂは、上端部に凹部５１が形成されたＣＦＲＭ束５０Ｂを備えている。   A hollow valve 10B shown in FIG. 5 includes a CFRM bundle 50B having a recess 51 formed at the upper end.

このような構成とすることにより、ＣＦＲＭ束５０Ｂとステム部３０の内面との接触性を確保しつつ、全体として軽量化することができる。   By setting it as such a structure, it can reduce in weight while ensuring the contact property of the CFRM bundle 50B and the inner surface of the stem part 30. FIG.

尚、図６に示すように、ＣＦＲＭ束５０Ｃの先端部をステム部３０の上端まで延ばすとともに、凹部５１を形成し、これに冷媒６０を封入する構成とすることも可能である。   In addition, as shown in FIG. 6, while extending the front-end | tip part of CFRM bundle 50C to the upper end of the stem part 30, it can also be set as the structure which forms the recessed part 51 and encloses the refrigerant | coolant 60 in this.

このような構成とすることにより、ＣＦＲＭ束５０Ｃが中空部４０のステム部３０の内壁面全体に接触するので、ステム部３０の温度が低下し、バルブガイド７０とのクリアランスが狭くならず、フリクションや摩耗を低減できる。   With such a configuration, the CFRM bundle 50C comes into contact with the entire inner wall surface of the stem portion 30 of the hollow portion 40, so that the temperature of the stem portion 30 is lowered, the clearance with the valve guide 70 is not narrowed, and the friction is reduced. And wear can be reduced.

上記実施形態では、炭素繊維強化金属の束を用いた場合について説明したが、
これ以外にも炭素繊維の束を用いることも可能である。 In the above embodiment, the case of using a bundle of carbon fiber reinforced metal has been described.
Besides this, it is also possible to use a bundle of carbon fibers.

本発明の一実施形態に係る内燃機関用バルブの断面図である。It is sectional drawing of the valve for internal combustion engines which concerns on one Embodiment of this invention. 図１のＡ部の拡大図である。It is an enlarged view of the A section of FIG. 本発明と比較例の冷却性能を示す図である。It is a figure which shows the cooling performance of this invention and a comparative example. 本発明の他の実施形態に係る内燃機関用バルブの断面図である。It is sectional drawing of the valve for internal combustion engines which concerns on other embodiment of this invention. 本発明のさらに他の実施形態に係る内燃機関用バルブの断面図である。It is sectional drawing of the valve for internal combustion engines which concerns on other embodiment of this invention. 図５に示す内燃機関用バルブの変形例を示す断面図である。FIG. 6 is a cross-sectional view showing a modification of the internal combustion engine valve shown in FIG. 5.

符号の説明Explanation of symbols

１０，１０Ａ，１０Ｂ…中空バルブ
２０…傘部
２１…キャップ部
３０…ステム部
４０…中空部
５０，５０Ａ，５０Ｂ，５０Ｃ…ＣＦＲＭ束
５１…凹部
６０…冷媒
７０…バルブガイド DESCRIPTION OF SYMBOLS 10, 10A, 10B ... Hollow valve 20 ... Umbrella part 21 ... Cap part 30 ... Stem part 40 ... Hollow part 50, 50A, 50B, 50C ... CFRM bundle 51 ... Recess 60 ... Refrigerant 70 ... Valve guide

Claims (2)

内燃機関の吸気バルブ又は排気バルブとして使用され、傘部と前記傘部に続くステム部とを有し、前記傘部から前記ステム部にかけて中空部が形成されているとともに、前記中空部の少なくとも一部に冷媒が封入された内燃機関用バルブであって、
繊維長手方向に高熱伝導率を有する炭素繊維強化金属の束が前記中空部内に前記冷媒に接触するように設けられ、
前記炭素繊維強化金属の束の繊維長手方向における一端部が前記傘部の先端部を構成するキャプ部の内面に接触し、
前記炭素繊維強化金属の束の繊維長手方向における他端部が、バルブガイド近傍の前記ステム部の内部に接続されている、
ことを特徴とする内燃機関用バルブ。 It is used as an intake valve or an exhaust valve of an internal combustion engine, has an umbrella part and a stem part following the umbrella part, and a hollow part is formed from the umbrella part to the stem part, and at least one of the hollow parts A valve for an internal combustion engine in which a refrigerant is sealed in a part,
A bundle of carbon fiber reinforced metal having high thermal conductivity in the fiber longitudinal direction is provided in the hollow portion so as to contact the refrigerant,
One end portion in the fiber longitudinal direction of the bundle of carbon fiber reinforced metal is in contact with the inner surface of the cap portion constituting the tip portion of the umbrella portion,
The other end of the carbon fiber reinforced metal bundle in the fiber longitudinal direction is connected to the inside of the stem near the valve guide.
An internal combustion engine valve characterized by the above. 前記冷媒は、前記傘部の内部に収容されている、ことを特徴とする請求項１に記載の内燃機関用バルブ。   The internal combustion engine valve according to claim 1, wherein the refrigerant is accommodated inside the umbrella portion.
JP2007206965A 2007-08-08 2007-08-08 Valve for internal combustion engine Expired - Fee Related JP4690369B2 (en)

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