JP3018260B2 - Hollow valves for internal combustion engines - Google Patents
Hollow valves for internal combustion enginesInfo
- Publication number
- JP3018260B2 JP3018260B2 JP21650991A JP21650991A JP3018260B2 JP 3018260 B2 JP3018260 B2 JP 3018260B2 JP 21650991 A JP21650991 A JP 21650991A JP 21650991 A JP21650991 A JP 21650991A JP 3018260 B2 JP3018260 B2 JP 3018260B2
- Authority
- JP
- Japan
- Prior art keywords
- hollow
- valve
- internal combustion
- green compact
- hollow valve
- 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
- 238000002485 combustion reaction Methods 0.000 title claims description 8
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 12
- 229910052708 sodium Inorganic materials 0.000 claims description 12
- 239000011734 sodium Substances 0.000 claims description 12
- 239000002826 coolant Substances 0.000 claims description 8
- 239000011261 inert gas Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 239000011777 magnesium Substances 0.000 claims description 4
- 239000011701 zinc Substances 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910001111 Fine metal Inorganic materials 0.000 description 1
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000012312 sodium hydride Substances 0.000 description 1
- 229910000104 sodium hydride Inorganic materials 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/12—Cooling of valves
- F01L3/14—Cooling of valves by means of a liquid or solid coolant, e.g. sodium, in a closed chamber in a valve
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Powder Metallurgy (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、内燃機関用の吸排気弁
として用いられる中空弁に係り、特に、傘部からステム
にかけて設けられた中空孔内に、冷却媒体としての圧粉
体を封入してなる中空弁に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow valve used as an intake / exhaust valve for an internal combustion engine, and in particular, a green compact as a cooling medium is sealed in a hollow hole provided from an umbrella to a stem. The present invention relates to a hollow valve.
【０００２】[0002]
【従来の技術】最近の自動車用エンジンは、過給機を搭
載したり多弁機構を採用するなど、高回転、高出力化の
傾向にある。2. Description of the Related Art Recent automobile engines tend to have higher rotation speed and higher output by mounting a supercharger or adopting a multi-valve mechanism.
【０００３】エンジンの許容回転数を高めるうえで最も
障害となるのは、動弁系の重量による慣性質量の増加で
あり、動弁系の構成部品の総重量が大となると、その慣
性のために、高速回転になるほど、弁体のカムに対する
追従性能が低下し、弁体がおどり等を発生して出力低下
を招く。The most hindrance in increasing the allowable rotation speed of the engine is the increase in the inertial mass due to the weight of the valve train. When the total weight of the components of the valve train increases, the inertia increases. In addition, as the rotation speed increases, the follow-up performance of the valve body with respect to the cam decreases, and the valve body generates a dance and the like, which causes a decrease in output.
【０００４】中空弁は、弁体を軽量化させ、動弁系の慣
性質量を軽減させる上において非常に有利であるため、
常時高速回転で使用されるレーシングカーのエンジン
や、一部の乗用車の高出力型エンジンに採用されてい
る。Since the hollow valve is very advantageous in reducing the weight of the valve body and reducing the inertial mass of the valve train,
It is used in racing car engines that are constantly used at high speeds and in high-power engines for some passenger cars.
【０００５】この種の中空弁には、傘部からステムにか
けてあけられた中空孔内に、冷却媒体としての金属ナト
リウムを封入して、傘部からステムへの熱伝達効率を高
め、熱負荷を軽減するようにしたものがある(特開昭60-
145410号公報、実開昭63-151911号公報参照)。[0005] In this kind of hollow valve, metallic sodium as a cooling medium is sealed in a hollow hole opened from the head to the stem to increase the efficiency of heat transfer from the head to the stem and reduce the heat load. Some are designed to reduce (Japanese Patent Application Laid-Open
145410, Japanese Utility Model Application Laid-Open No. 63-151911).
【０００６】[0006]
【発明が解決しようとする課題】上述のような金属ナト
リウムを封入してなる中空弁では、金属ナトリウムが、
水や酸素等と反応し易く、この反応により、中空孔の内
部に酸化ナトリウムや水酸化ナトリウム、水素化ナトリ
ウム等が生成されると、中空孔の内圧を高めたり、熱伝
達効率を低下させたりする。そのため、中空孔内に残留
している水分等を除去するとともに、中空孔への金属ナ
トリウムの注入作業を、不活性ガスの雰囲気中で行なう
必要がある。In a hollow valve in which metallic sodium is sealed as described above, metallic sodium is
It easily reacts with water, oxygen, etc., and when sodium oxide, sodium hydroxide, sodium hydride, etc. are generated inside the hollow by this reaction, the internal pressure of the hollow is increased or the heat transfer efficiency is reduced. I do. Therefore, it is necessary to remove the moisture and the like remaining in the hollow hole and to perform the operation of injecting the metallic sodium into the hollow hole in an inert gas atmosphere.
【０００７】また金属ナトリウムは、上記性質に加え
て、強アルカリ性を有しているため、その注入にあたっ
ては、安全性の面において十分注意を払う必要があり、
その製造には、多くの面倒な工程を要し、かつ安全管理
を厳重に行なう必要がある。[0007] In addition, since metallic sodium has a strong alkalinity in addition to the above properties, it is necessary to pay sufficient attention to safety when injecting it.
Its production requires many complicated steps and requires strict safety management.
【０００８】また、エンジンに組付けられた後に、スク
ラップ処理や廃棄処分する際等において、万一ステムが
切損して、金属ナトリウムが流出すると非常に危険であ
る。[0008] Further, in the event of scrap processing or disposal after being assembled to the engine, it is extremely dangerous if the stem is cut off and metallic sodium flows out.
【０００９】本発明は、上記課題に鑑みてなされたもの
で、その目的とするところは、中空孔内に、金属ナトリ
ウムに代わる冷却媒体を封入することにより、製造が容
易で、かつ安全性の高い中空弁を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide a simple and safe manufacturing method by enclosing a cooling medium instead of metallic sodium in a hollow hole. It is to provide a high hollow valve.
【００１０】[0010]
【課題を解決するための手段】本発明によると、上記課
題は、次のようにして解決される。 According to the present invention, the above section
The problem is solved as follows.
【００１１】(１) 少なくともステム内に穿設した中空
孔内に、冷却媒体として金属ナトリウムを除く圧粉体を
封入するとともに、該圧粉体の上面を、ステムにおける
バルブガイドと摺接する部分内に位置させた内燃機関用
中空弁として構成する。 (1) At least in a hollow hole formed in a stem, a green compact excluding metallic sodium is used as a cooling medium.
At the same time, the top surface of the green compact is
For internal combustion engines located in the area that comes into sliding contact with the valve guide
It is configured as a hollow valve.
【００１２】(２) 上記(１)項において、中空孔の上端
と圧粉体の上端との間に、空隙を存在させる。 (2) In the above item (1) , a gap is provided between the upper end of the hollow hole and the upper end of the green compact .
【００１３】(３) 上記(２)項において、空隙を真空と
する。 (3) In the above item (2), the gap is evacuated to a vacuum.
I do.
【００１４】(４) 上記(２)項において、空隙に不活性
ガスを封入する。 (4) In the above item (2), the space is filled with an inert gas .
【００１５】(５) 上記(１)〜(４)項のいずれかにおい
て、圧粉体が、銅、アルミニウム、マグネシウム、亜鉛
のいずれか、又はそれらの混合物からなるものとする。 (5) In any one of the above items (1) to (4)
Te, powder compact, copper, aluminum, magnesium, either zinc or a shall such mixtures thereof.
【００１６】[0016]
【作用】中空孔内に封入する冷却媒体として、金属ナト
リウムを除く危険性のない物質を用い、かつ圧粉体の形
態として封入することにより、製造工程が簡略化され、
かつ万一弁が切損して圧粉体が流出しても、人体等に害
を及ぼすことがない。[Function] Metal nato is used as a cooling medium to be sealed in the hollow hole.
Use a non-hazardous substance other than lium and form a compact
By encapsulating as a state , the manufacturing process is simplified,
Even if the valve is cut off and the green compact flows out, there is no harm to the human body or the like.
【００１７】また、圧粉体の上面を、ステムにおけるバ
ルブガイドと摺接する部分内に位置させたために、中空
弁の傘部が燃焼ガス等により高温に加熱されると、その
熱は、圧粉体を媒体として、ステム側に速やかに伝達さ
れ、バルブガイドを通してシリンダヘッド等に効率よく
伝達される。その結果、傘部の熱負荷は著しく軽減され
る。 Also, the upper surface of the green compact is
It is hollow because it is located in the part that comes in sliding contact with the lube guide.
When the head of the valve is heated to a high temperature by combustion gas, etc.,
Heat is quickly transferred to the stem using the compact as a medium.
Efficiently through the valve guide to the cylinder head, etc.
Is transmitted. As a result, the heat load on the umbrella is significantly reduced.
You.
【００１８】[0018]
【実施例】以下、本発明の実施例を、図面に基づいて説
明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１９】図１は、耐熱鋼をもって成形された、本発
明の第１実施例の中空弁(１)を示し、下方へ向かって拡
開する傘部(２)から、ステム(３)の上端部に形成された
コッタ(図示略)係止用の環状凹溝(４)の手前までに亘る
中心軸線上には、傘部(２)側をラッパ状に拡径させた中
空孔(５)が、傘部(２)の前面(2a)側より穿設されてい
る。FIG. 1 shows a hollow valve (1) according to a first embodiment of the present invention, which is formed of heat-resistant steel, from an umbrella portion (2) expanding downward, to an upper end of a stem (3). A hollow hole (5) in which the umbrella (2) side is expanded in a trumpet shape on the central axis extending to a position short of an annular concave groove (4) for retaining a cotter (not shown) formed in the portion. Are formed from the front (2a) side of the umbrella (2).
【００２０】中空孔(５)内には、冷却媒体である圧粉体
(６)が、中空孔(５)の高さのほぼ1/3程度の空隙(5a)を
残して、すなわち、この中空弁(１)をエンジンに組付け
た際、バルブガイド(７)と摺接する部分におけるステム
(３)内に、圧粉体(６)の一部が位置するようにして、封
入されている。In the hollow hole (5), a green compact as a cooling medium is provided.
(6) leaves a space (5a) about 1/3 of the height of the hollow hole (5), that is, when the hollow valve (1) is assembled to the engine, the valve guide (7) is Stem in sliding contact
(3) is sealed so that a part of the green compact (6) is located.
【００２１】圧粉体(６)の材料としては、エンジンのフ
ァイアリング運転時における弁体の作動温度によっても
溶融しない融点を有し、かつ比較的低比重であって、熱
せられ易く冷め易い熱伝導性に優れる物質、例えば、
銅、アルミニウム、マグネシウム、亜鉛、チタン等の微
小金属粉、又はそれらの金属粉を選択して混合した複合
物が好ましい。The material of the green compact (6) has a melting point that does not melt even at the operating temperature of the valve body during the firing operation of the engine, has a relatively low specific gravity, and is easily heated and easily cooled. Materials with excellent conductivity, for example,
A fine metal powder such as copper, aluminum, magnesium, zinc, and titanium, or a composite obtained by selecting and mixing these metal powders is preferable.
【００２２】この実施例では、上記金属粉を、中空孔
(５)と同形をなすように押し固めて、予め圧粉体(６)を
形成し、これを、傘部(２)の下面(2a)に穿設した開口部
(2b)より中空孔(５)に挿入したのち、開口部(2b)を、閉
塞板(８)をもって閉塞してある。In this embodiment, the above-described metal powder is
(5) is pressed and solidified to form a green compact (6) in advance, which is formed in an opening formed in the lower surface (2a) of the umbrella (2).
After being inserted into the hollow hole (5) from (2b), the opening (2b) is closed with a closing plate (8).
【００２３】なお、圧粉体(６)が酸化性の物質の場合に
は、空隙(5a)を真空とするか、又は窒素ガス等の不活性
ガスを封入するのがよい。When the green compact (6) is an oxidizing substance, the space (5a) is preferably evacuated or filled with an inert gas such as nitrogen gas.
【００２４】また、弁作動時の振動等により、圧粉体
(６)が破砕する恐れがあるときには、圧粉体(６)の成形
時に、耐熱性の適当なバインダを用いることがある。Also, due to vibrations or the like during valve operation, the compact
If (6) is likely to be crushed, a suitable heat-resistant binder may be used during the molding of the green compact (6).
【００２５】次に、本発明の第２実施例を、図２を参照
して説明する。Next, a second embodiment of the present invention will be described with reference to FIG.
【００２６】この実施例に示す中空弁(11)では、ステム
(12)を、第１実施例におけるよりも若干短寸の中空軸部
(13)と、その上端に固着された端末部材(14)とをもって
構成してある。In the hollow valve (11) shown in this embodiment, the stem
(12) is replaced with a hollow shaft part slightly shorter than in the first embodiment.
(13) and a terminal member (14) fixed to the upper end thereof.
【００２７】中空軸部(13)における中空孔(13a)の下部
は、ステム(12)の下端に続く傘部(15)の内部にまで達し
ており、かつ中空孔(13a)には、第１実施例におけると
同様の圧粉体(16)を充填してある。The lower portion of the hollow hole (13a) in the hollow shaft portion (13) reaches the inside of the umbrella portion (15) following the lower end of the stem (12), and the hollow hole (13a) has The same green compact (16) as in the first embodiment is filled.
【００２８】端末部材(14)は、要所に環状凹溝(14a)を
備え、摩擦圧接等により中空軸部(13)の上端に固着さ
れ、中空孔(13a)を閉じている。The terminal member (14) is provided with an annular groove (14a) at an important point, is fixed to the upper end of the hollow shaft (13) by friction welding or the like, and closes the hollow hole (13a).
【００２９】圧粉体(16)は、金属粉を、予め中空孔(13
a)と同形状に押し固めてから、中空孔(13a)に挿入して
も、あるいは金属粉を中空孔(13a)に充填したのち、つ
き固めてもよい。As the green compact (16), the metal powder is previously filled with hollow holes (13).
After being pressed into the same shape as in a), it may be inserted into the hollow hole (13a), or may be compacted after filling the hollow hole (13a) with metal powder.
【００３０】(17)はバルブガイドである。以上説明した
各実施例の中空弁(１)(11)においては、いずれも傘部
(２)(15)が燃焼ガス等により高温に加熱されると、その
熱は、各中空孔(５)(13a)に封入された圧粉体(６)(16)
を媒体として、ステム(３)(12)側に速やかに伝達され、
バルブガイド(７)(17)を通してシリンダヘッド等に放熱
される。(17) is a valve guide. In the hollow valves (1) and (11) of the respective embodiments described above,
(2) When (15) is heated to a high temperature by a combustion gas or the like, the heat is transferred to the green compact (6) (16) sealed in each hollow hole (5) (13a).
Is quickly transmitted to the stem (3) (12) side using
Heat is radiated to the cylinder head and the like through the valve guides (7) and (17).
【００３１】その結果、傘部(２)(15)の熱負荷は著しく
軽減される。また、圧粉体(６)(16)は、無数の金属粉同
士の粒子結合により構成され、かつ粒子間に極く僅かの
間隙を有しているため、万一圧粉体(６)(16)が熱膨張し
ても、ステム(３)又は(12)に内方より応力が作用するこ
とはない。As a result, the heat load on the heads (2) and (15) is significantly reduced. Further, since the green compacts (6) and (16) are formed by the particle bonding of innumerable metal powders and have very small gaps between the particles, the green compact (6) (16) Even if 16) is thermally expanded, no stress acts on the stem (3) or (12) from inside.
【００３２】第１実施例において、圧粉体(６)を中空孔
(５)全体に充填してもよく、また、第２実施例におい
て、中空孔(13a)に対する圧粉体(16)の封入量を、ステ
ム(12)におけるバルブガイド(17)と摺接する部分の約1/
2程度までとし、残りを空隙としてもよい。In the first embodiment, the green compact (6) is
(5) The whole may be filled, and in the second embodiment, the amount of the compact (16) filled in the hollow hole (13a) is adjusted by the portion of the stem (12) which is in sliding contact with the valve guide (17). About 1 /
It may be up to about 2 and the remainder may be voids.
【００３３】中空孔(５)(13a)の形状は、任意に定めて
もよいことは、言うまでもない。It goes without saying that the shape of the hollow holes (5) and (13a) may be arbitrarily determined.
【００３４】[0034]
【発明の効果】本発明によれば、次のような効果を奏す
ることができる。 (ａ) 中空孔内に封入する冷却媒体を
金属ナトリウムを除く圧粉体としたことにより、従来の
金属ナトリウムを封入した中空弁に比べて、製造工程が
簡略化されて、製造コストを低減しうるばかりでなく、
危険性がないため、安全性の高い中空弁を提供すること
ができる。According to the present invention, the following effects can be obtained.
Can be (a) The cooling medium to be sealed in the hollow hole
By adopting a green compact excluding metallic sodium , the production process is simplified and the production cost can be reduced, as compared with the conventional hollow valve in which metallic sodium is sealed.
Since there is no danger, a highly safe hollow valve can be provided.
【００３５】(ｂ) 傘部の熱は、圧粉体を介して効果的
にステム側に伝達され、更にバルブガイドを通してシリ
ンダヘッド等に効率よく放熱されるため、傘部の冷却性
が損なわれる恐れはない。 (B) The heat of the umbrella portion is effectively transmitted to the stem side via the green compact , and is further transmitted through the valve guide.
Since the heat is efficiently radiated to the head and the like, there is no possibility that the cooling performance of the umbrella portion is impaired.
【００３６】(ｃ) 請求項２記載の発明のように、中空
孔内に空隙を残すようにすると、特に軸線方向の熱膨張
の差を吸収しうるとともに、軽量化を図ることができ
る。 (C) If a space is left in the hollow hole as in the second aspect of the invention, the difference in thermal expansion in the axial direction can be absorbed, and the weight can be reduced.
【００３７】(ｄ) 請求項３または４記載の発明のよう
に、空隙を真空にするか、または不活性ガスを封入する
と、圧粉体が酸化性の物質の場合も、その酸化を防止す
ることができる。 (D) As in the invention according to claim 3 or 4
Vacuum the air gap or fill with inert gas
When the green compact is an oxidizing substance,
Can be
【００３８】(ｅ) 請求項５記載の発明のように、圧粉
体を、銅、アルミニウム、マグネシ ウム、亜鉛のいずれ
か、またはそれらの混合物とすることによって、従来の
金属ナトリウムを封入した中空弁に比べて、危険性がな
く、安全性の高い中空弁を提供することができるととも
に、傘部の熱を、これらの物質よりなる圧粉体を媒体と
して、効果的に放熱させることができる。 (E) As in the invention of claim 5, a powder compact
The body, either copper, aluminum, magnesium, zinc
Or a mixture of them,
There is no danger compared to hollow valves containing metallic sodium.
To provide a highly safe hollow valve
In addition, the heat of the umbrella is converted to a green compact made of these substances as a medium.
Thus, heat can be dissipated effectively.
【図１】本発明の中空弁の第１実施例を示す縦断正面図
である。FIG. 1 is a longitudinal sectional front view showing a first embodiment of a hollow valve according to the present invention.
【図２】同じく第２実施例を示す縦断正面図である。FIG. 2 is a vertical sectional front view showing the second embodiment.
(１)中空弁 (２)傘部 (2a)下面 (2b)開口部 (３)ステム (４)環状凹溝 (５)中空孔 (5a)空隙 (６)圧粉体 (７)バルブガイド (８)閉塞板 (11)中空弁 (12)ステム (13)中空軸部 (13a)中空孔 (14)端末部材 (15)傘部 (16)圧粉体 (17)バルブガイド (1) Hollow valve (2) Head (2a) Lower surface (2b) Opening (3) Stem (4) Annular groove (5) Hollow hole (5a) Void (6) Compact (7) Valve guide ( 8) Blocking plate (11) Hollow valve (12) Stem (13) Hollow shaft (13a) Hollow hole (14) Terminal member (15) Head (16) Compact (17) Valve guide
Claims (5)
に、冷却媒体として、金属ナトリウムを除く圧粉体を封
入するとともに、該圧粉体の上面を、ステムにおけるバ
ルブガイドと摺接する部分内に位置させたことを特徴と
する内燃機関用中空弁。1. A compact, excluding metallic sodium, is sealed as a cooling medium in at least a hollow hole formed in a stem.
And press the upper surface of the green compact
A hollow valve for an internal combustion engine, wherein the hollow valve is located in a portion in sliding contact with a lube guide .
空隙を存在させたことを特徴とする請求項１記載の内燃
機関用中空弁。2. Between the upper end of the hollow hole and the upper end of the green compact,
The hollow valve for an internal combustion engine according to claim 1, characterized in that the presence of voids.
燃機関用中空弁。3. The hollow valve for an internal combustion engine according to claim 2, wherein the space is a vacuum.
２記載の内燃機関用中空弁。4. An air gap filled with an inert gas.
3. The hollow valve for an internal combustion engine according to 2 .
ウム、亜鉛のいずれか、又はそれらの混合物からなって
いる請求項１〜４のいずれかに記載の内燃機関用中空
弁。5. The hollow valve for an internal combustion engine according to claim 1, wherein the green compact is made of any one of copper, aluminum, magnesium, and zinc, or a mixture thereof.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21650991A JP3018260B2 (en) | 1991-08-02 | 1991-08-02 | Hollow valves for internal combustion engines |
| JP22808598A JPH11117718A (en) | 1991-08-02 | 1998-08-12 | Hollow valves for internal combustion engines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21650991A JP3018260B2 (en) | 1991-08-02 | 1991-08-02 | Hollow valves for internal combustion engines |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22808598A Division JPH11117718A (en) | 1991-08-02 | 1998-08-12 | Hollow valves for internal combustion engines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05113113A JPH05113113A (en) | 1993-05-07 |
| JP3018260B2 true JP3018260B2 (en) | 2000-03-13 |
Family
ID=16689547
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21650991A Expired - Lifetime JP3018260B2 (en) | 1991-08-02 | 1991-08-02 | Hollow valves for internal combustion engines |
| JP22808598A Pending JPH11117718A (en) | 1991-08-02 | 1998-08-12 | Hollow valves for internal combustion engines |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22808598A Pending JPH11117718A (en) | 1991-08-02 | 1998-08-12 | Hollow valves for internal combustion engines |
Country Status (1)
| Country | Link |
|---|---|
| JP (2) | JP3018260B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160053641A1 (en) * | 2013-04-11 | 2016-02-25 | Nittan Valve Co., Ltd. | Hollow poppet valve |
| KR101941156B1 (en) * | 2017-07-27 | 2019-01-23 | 신한발브공업(주) | Poppet valve for engine and manufacturing method for the same |
| US11300018B2 (en) | 2018-03-20 | 2022-04-12 | Nittan Valve Co., Ltd. | Hollow exhaust poppet valve |
| US11536167B2 (en) | 2018-11-12 | 2022-12-27 | Nittan Valve Co., Ltd. | Method for manufacturing engine poppet valve |
| US11850690B2 (en) | 2020-03-30 | 2023-12-26 | Nittan Corporation | Method for manufacturing engine poppet valve |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6075366B2 (en) * | 2014-12-19 | 2017-02-08 | マツダ株式会社 | Engine valve device |
| JP5957163B1 (en) * | 2015-10-28 | 2016-07-27 | 日鍛バルブ株式会社 | Inert gas supply method for poppet valve intermediate body and inert gas supply apparatus for poppet valve intermediate body |
-
1991
- 1991-08-02 JP JP21650991A patent/JP3018260B2/en not_active Expired - Lifetime
-
1998
- 1998-08-12 JP JP22808598A patent/JPH11117718A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160053641A1 (en) * | 2013-04-11 | 2016-02-25 | Nittan Valve Co., Ltd. | Hollow poppet valve |
| US9920663B2 (en) * | 2013-04-11 | 2018-03-20 | Nittan Valve Co., Ltd. | Hollow poppet valve |
| KR101941156B1 (en) * | 2017-07-27 | 2019-01-23 | 신한발브공업(주) | Poppet valve for engine and manufacturing method for the same |
| US11300018B2 (en) | 2018-03-20 | 2022-04-12 | Nittan Valve Co., Ltd. | Hollow exhaust poppet valve |
| US11536167B2 (en) | 2018-11-12 | 2022-12-27 | Nittan Valve Co., Ltd. | Method for manufacturing engine poppet valve |
| US11850690B2 (en) | 2020-03-30 | 2023-12-26 | Nittan Corporation | Method for manufacturing engine poppet valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11117718A (en) | 1999-04-27 |
| JPH05113113A (en) | 1993-05-07 |
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