JP2013245558A - Engine valve for intake air - Google Patents

Engine valve for intake air Download PDF

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Publication number
JP2013245558A
JP2013245558A JP2012117368A JP2012117368A JP2013245558A JP 2013245558 A JP2013245558 A JP 2013245558A JP 2012117368 A JP2012117368 A JP 2012117368A JP 2012117368 A JP2012117368 A JP 2012117368A JP 2013245558 A JP2013245558 A JP 2013245558A
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Prior art keywords
valve
engine
shaft portion
intake
shaft
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JP2012117368A
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JP5964134B2 (en
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Hiroshi Sakaguchi
寛 阪口
Hironori Tanigawa
裕紀 谷川
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Aisan Industry Co Ltd
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Aisan Industry Co Ltd
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Priority to JP2012117368A priority Critical patent/JP5964134B2/en
Priority to CN2013101695060A priority patent/CN103422930A/en
Priority to US13/899,327 priority patent/US20130312694A1/en
Publication of JP2013245558A publication Critical patent/JP2013245558A/en
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    • 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
    • F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/20—Making machine elements valve parts
    • B21K1/22—Making machine elements valve parts poppet valves, e.g. for internal-combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
    • B23P15/002—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings poppet valves

Abstract

PROBLEM TO BE SOLVED: To provide an engine valve for an intake air capable of increasing an intake flow rate and a tumble flow, while securing strength.SOLUTION: An engine valve 20 for an intake air includes a vale head part 22 and a valve stem part 24 formed by casting, opens-closes an intake port of an engine, and includes a tapered part 26 diametrically reduced toward the valve stem part 24 side from the valve head part 22 side between the valve head part 22 and the valve stem part 24 and having an outer peripheral surface formed as a tapered surface of a predetermined tapered angle θ1 with a cross section as a straight line. In the valve stem part 24, a small diameter shaft part 30 of outer diameter smaller than outer diameter of shaft parts 28 and 29, is formed between the guide shaft part 28 guided by a valve guide of the engine and the end shaft part 29.

Description

本発明は、吸気用エンジンバルブに関する。   The present invention relates to an intake engine valve.

エンジンバルブとしては、例えば特許文献１に記載されたものがある。特許文献１（「従来例という」）では、弁頭（本明細書でいう「弁傘部」に相当する。）径をφＤとし、弁頭表面から略φＤ／２の長さのところの弁棒（同、「弁軸部」）径をφｄ2としたポペットバルブにおいて、弁頭表面から略φＤ／２の範囲内の弁棒部分に、φｄ2より小さい小径部を設けている。 An example of the engine valve is described in Patent Document 1. In Patent Document 1 (referred to as “conventional example”), the diameter of the valve head (corresponding to the “valve part” in the present specification) is φD, and the valve is approximately φD / 2 from the valve head surface. In a poppet valve having a rod ("valve shaft portion") diameter of φd 2 , a small-diameter portion smaller than φd 2 is provided in a valve rod portion within a range of approximately φD / 2 from the valve head surface.

実開平５−３６００９号公報Japanese Utility Model Publication No. 5-36009

従来例によると、弁頭表面から略φＤ／２の範囲内の弁棒部分に小径部を設けるため、小径部の軸長が自ずと制限される。したがって、吸気用とした場合、吸気流量及びタンブル流を増加する効果も小さいという問題があった。なお、単に小径部の軸長を長くするだけでは強度の確保が難しい。   According to the conventional example, since the small diameter portion is provided in the valve stem portion within a range of approximately φD / 2 from the valve head surface, the axial length of the small diameter portion is naturally limited. Therefore, when used for intake, there is a problem that the effect of increasing the intake flow rate and the tumble flow is small. Note that it is difficult to ensure the strength simply by increasing the axial length of the small diameter portion.

本発明が解決しようとする課題は、強度を確保するとともに吸気流量及びタンブル流を増加することのできる吸気用エンジンバルブを提供することにある。   The problem to be solved by the present invention is to provide an intake engine valve capable of ensuring strength and increasing intake flow rate and tumble flow.

前記課題は、特許請求の範囲に記載された構成を要旨とする吸気用エンジンバルブにより解決することができる。
請求項１に記載された吸気用エンジンバルブによると、鍛造により形成された弁傘部及び弁軸部を有し、エンジンの吸気ポートを開閉する吸気用エンジンバルブであって、弁傘部と弁軸部との間に、弁傘部側から弁軸部側に向かって小径化されかつ外周面が断面を直線とする所定のテーパ角のテーパ面に形成されたテーパ部を有し、弁軸部において、エンジンのバルブガイドにより案内される案内軸部とテーパ部側の端軸部との間に、それらの軸部の外径よりも小さい外径の小径軸部を形成したものである。この構成によると、鍛造により形成される弁傘部と弁軸部との間に、弁傘部側から弁軸部側に向かって小径化されかつ外周面が断面を直線とする所定のテーパ角のテーパ面に形成されたテーパ部を有することによって、強度を向上することができる。これにより、弁軸部において、エンジンのバルブガイドにより案内される案内軸部とテーパ部側の端軸部との間に形成される小径軸部の軸長を長くし、吸気流量及びタンブル流を増加することができる。したがって、強度を確保するとともに吸気流量及びタンブル流を増加することができる。 The above problem can be solved by an intake engine valve having the gist of the structure described in the claims.
The intake engine valve according to claim 1 is an intake engine valve having a valve head portion and a valve shaft portion formed by forging and opening and closing an intake port of the engine, wherein the valve head portion and the valve Between the shaft portion, there is a tapered portion formed with a taper surface having a predetermined taper angle whose outer diameter is reduced in diameter from the valve head portion side toward the valve shaft portion side and whose outer surface is a straight section. In this section, a small-diameter shaft portion having an outer diameter smaller than the outer diameter of the shaft portion is formed between the guide shaft portion guided by the valve guide of the engine and the end shaft portion on the taper portion side. According to this configuration, a predetermined taper angle between the valve head portion formed by forging and the valve shaft portion is reduced in diameter from the valve head portion side to the valve shaft portion side and the outer peripheral surface has a straight section. By having the taper portion formed on the taper surface, the strength can be improved. As a result, in the valve shaft portion, the axial length of the small diameter shaft portion formed between the guide shaft portion guided by the engine valve guide and the end shaft portion on the taper portion side is lengthened, and the intake flow rate and the tumble flow are reduced. Can be increased. Therefore, it is possible to secure the strength and increase the intake flow rate and the tumble flow.

請求項２に記載された吸気用エンジンバルブによると、テーパ部及び傘裏部が鍛造肌である。したがって、研磨等の機械加工により総加工する場合と比べて、加工工数を削減し、コストを低減することができる。   According to the engine valve for intake described in claim 2, the tapered portion and the umbrella back portion are forged skin. Therefore, compared with the case where total machining is performed by machining such as polishing, the number of processing steps can be reduced and the cost can be reduced.

請求項３に記載された吸気用エンジンバルブによると、小径軸部は、バルブガイドの吸気ポート側の軸端に対して、開弁時の小径軸部の案内軸部側の軸端が近接する位置に位置するように形成されている。したがって、吸気流量及びタンブル流を最大又は最大に近くまで増加することができる。   According to the engine valve for intake described in claim 3, the shaft end on the guide shaft portion side of the small diameter shaft portion when the valve is opened is close to the shaft end on the intake port side of the valve guide. It is formed to be positioned. Accordingly, the intake flow rate and the tumble flow can be increased to the maximum or close to the maximum.

一実施形態にかかる吸気用エンジンバルブを一部破断して示す正面図である。It is a front view showing a partially broken intake engine valve according to an embodiment. 吸気用エンジンバルブの弁傘部の周辺部を示す正面図である。It is a front view which shows the peripheral part of the valve head part of the engine valve for intake. エンジンの吸気用エンジンバルブの周辺部を開弁状態で示す断面図である。It is sectional drawing which shows the peripheral part of the engine valve for intake of an engine in a valve opening state. エンジンの吸気用エンジンバルブの周辺部を閉弁状態で示す断面図である。It is sectional drawing which shows the peripheral part of the engine valve for intake of an engine in a valve closing state. 比較例の吸気用エンジンバルブの弁傘部の周辺部を示す正面図である。It is a front view which shows the peripheral part of the valve head part of the engine valve for intake of the comparative example. 吸気用エンジンバルブの弁傘部の周辺部を比較例と比較して示す正面図である。It is a front view which shows the peripheral part of the valve head part of the engine valve for intake compared with a comparative example.

以下、本発明を実施するための実施形態について図面を用いて説明する。説明の都合上、エンジンの吸気用エンジンバルブの周辺部の構成について説明した後、吸気用エンジンバルブについて説明する。図３はエンジンの吸気用エンジンバルブの周辺部を開弁状態で示す断面図、図４は同じく閉弁状態で示す断面図である。なお、図３及び図４における上下を基準として吸気用エンジンバルブの説明を行う。
図３に示すように、エンジン（内燃機関）のシリンダヘッド１０には、燃焼室１１に連通する吸気ポート１２が形成されている。吸気ポート１２の下流端には、バルブシート１３が配置されている。また、シリンダヘッド１０には、バルブシート１３と同心状をなす金属製のバルブガイド１４が配置されている。バルブガイド１４には、吸気ポート１２（詳しくはバルブシート１３）を開閉する弁傘部２２を有する吸気用エンジンバルブ２０（詳しくは弁軸部２４）が軸方向（図３において上下方向）に摺動可能に支持されている。また、吸気用エンジンバルブ２０の開弁時には、弁傘部２２がバルブシート１３から離座することにより、空気が吸気ポート１２を通じて燃焼室１１に流入する。また、吸気用エンジンバルブ２０の閉弁時（図４参照）には、弁傘部２２がバルブシート１３に着座することにより、吸気ポート１２から燃焼室１１への空気の流入が阻止される。 DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. For convenience of explanation, the configuration of the periphery of the engine valve for intake of the engine will be described, and then the engine valve for intake will be described. FIG. 3 is a cross-sectional view showing the periphery of the engine valve for intake of the engine in an open state, and FIG. The intake engine valve will be described with reference to the upper and lower sides in FIGS.
As shown in FIG. 3, an intake port 12 communicating with the combustion chamber 11 is formed in the cylinder head 10 of the engine (internal combustion engine). A valve seat 13 is disposed at the downstream end of the intake port 12. The cylinder head 10 is provided with a metal valve guide 14 concentric with the valve seat 13. In the valve guide 14, an intake engine valve 20 (specifically, a valve shaft portion 24) having a valve head portion 22 that opens and closes the intake port 12 (specifically, the valve seat 13) slides in the axial direction (vertical direction in FIG. 3). It is supported movably. Further, when the intake engine valve 20 is opened, the valve head portion 22 is separated from the valve seat 13 so that air flows into the combustion chamber 11 through the intake port 12. Further, when the intake engine valve 20 is closed (see FIG. 4), the valve head portion 22 is seated on the valve seat 13, thereby preventing air from flowing into the combustion chamber 11 from the intake port 12.

続いて、前記吸気用エンジンバルブ２０について説明する。図１は吸気用エンジンバルブを一部破断して示す正面図、図２は同じく弁傘部の周辺部を示す正面図である。
図１に示すように、吸気用エンジンバルブ（以下、「エンジンバルブという」）２０は、鍛造により形成された弁傘部２２及び弁軸部２４を有するポペットバルブからなる。弁傘部２２と弁軸部２４とは同心状に形成されている。弁軸部２４の先端部（上端部）の外周面には、周方向に連続する環状溝２５が形成されている。環状溝２５は、図示しないが、動弁機構におけるバルブスプリングのリテーナ用の取付溝である。また、弁傘部２２の大径側端面（下端面）は、エンジンの燃焼室１１（図３参照）に面する弁表面２２ａとなっている。弁表面２２ａの中央部には浅い凹部２３が形成されている。また、エンジンバルブ２０は、例えば、耐熱鋼製、チタン合金製等の素材を鍛造することにより形成された後、所定部位（後述する）に対して機械加工（例えば研磨）が施されている。 Next, the intake engine valve 20 will be described. FIG. 1 is a front view showing a partially broken engine valve for intake, and FIG. 2 is a front view showing a peripheral portion of the valve head portion.
As shown in FIG. 1, an intake engine valve (hereinafter referred to as “engine valve”) 20 is a poppet valve having a valve head portion 22 and a valve shaft portion 24 formed by forging. The valve head portion 22 and the valve shaft portion 24 are formed concentrically. An annular groove 25 continuous in the circumferential direction is formed on the outer peripheral surface of the distal end portion (upper end portion) of the valve shaft portion 24. Although not shown, the annular groove 25 is a mounting groove for a retainer of the valve spring in the valve operating mechanism. Moreover, the large-diameter side end surface (lower end surface) of the valve head portion 22 is a valve surface 22a facing the combustion chamber 11 (see FIG. 3) of the engine. A shallow recess 23 is formed at the center of the valve surface 22a. The engine valve 20 is formed, for example, by forging a material such as a heat-resistant steel or a titanium alloy, and then machining (for example, polishing) is performed on a predetermined portion (described later).

図２に示すように、前記弁傘部２２と前記弁軸部２４との間すなわち接続部には、鍛造抜きにより形成されたテーパ部２６が形成されている。テーパ部２６は、弁傘部２２側（下側）から弁軸部２４側（上側）に向かって小径化されている。テーパ部２６の外周面は、断面を直線とする所定のテーパ角θ１のテーパ面に形成されている。テーパ角θ１は、例えば２０°に設定されている。なお、テーパ角θ１は２０°に限定されない。また、テーパ部２６の最小径２６ｄは、鍛造前の素材の外径である。また、弁表面２２ａからテーパ部２６の小径側の軸端までの高さＨ１は、例えば１０ｍｍである。なお、高さＨ１は１０ｍｍに限定されない。   As shown in FIG. 2, a tapered portion 26 formed by forging is formed between the valve head portion 22 and the valve shaft portion 24, that is, at the connection portion. The taper portion 26 is reduced in diameter from the valve head portion 22 side (lower side) toward the valve shaft portion 24 side (upper side). The outer peripheral surface of the taper part 26 is formed in the taper surface of predetermined taper angle (theta) 1 which makes a cross section a straight line. The taper angle θ1 is set to 20 °, for example. The taper angle θ1 is not limited to 20 °. Further, the minimum diameter 26d of the tapered portion 26 is the outer diameter of the material before forging. The height H1 from the valve surface 22a to the shaft end on the small diameter side of the tapered portion 26 is, for example, 10 mm. The height H1 is not limited to 10 mm.

前記弁軸部２４において、前記バルブガイド１４（図３参照）により案内される部分を案内軸部２８といい、テーパ部２６側の端部分（下端部）を端軸部２９という。案内軸部２８と端軸部２９との間には、両軸部２８，２９の外径よりも小さい外径３０ｄの小径軸部３０が形成されている。小径軸部３０の外径３０ｄは、例えばφ４．５ｍｍである。なお、外径３０ｄはφ４．５ｍｍに限定されない。また、弁軸部２４の環状溝２５及び小径軸部３０を除いた残りの部分で、案内軸部２８及び端軸部２９を含む部分は、外径２４ｄで形成されている。また、前記弁表面２２ａから小径軸部３０の案内軸部２８側の軸端３０ａまでの高さＨ２は、例えば３７ｍｍである。なお、高さＨ２は３７ｍｍに限定されない。   In the valve shaft portion 24, a portion guided by the valve guide 14 (see FIG. 3) is referred to as a guide shaft portion 28, and an end portion (lower end portion) on the tapered portion 26 side is referred to as an end shaft portion 29. Between the guide shaft portion 28 and the end shaft portion 29, a small-diameter shaft portion 30 having an outer diameter 30d smaller than the outer diameters of the shaft portions 28 and 29 is formed. The outer diameter 30d of the small diameter shaft portion 30 is, for example, φ4.5 mm. The outer diameter 30d is not limited to φ4.5 mm. Further, the remaining portion of the valve shaft portion 24 excluding the annular groove 25 and the small diameter shaft portion 30 and including the guide shaft portion 28 and the end shaft portion 29 is formed with an outer diameter 24d. The height H2 from the valve surface 22a to the shaft end 30a on the guide shaft portion 28 side of the small diameter shaft portion 30 is, for example, 37 mm. The height H2 is not limited to 37 mm.

図３に示すように、前記小径軸部３０は、前記バルブガイド１４の吸気ポート１２側（下側）の軸端１４ａに対して、開弁時の小径軸部３０の案内軸部２８側の軸端３０ａが近接する位置に位置するように形成されている。また、図２に示すように、小径軸部３０の案内軸部２８側の端部（上端部）は上側の接続部３１ａとされ、また、小径軸部３０の端軸部２９側の端部（下端部）は下側の接続部３１ｂとされている。両接続部３１ａ，３１ｂの外周面は、両軸部２８，２９にそれぞれ滑らかにつながる曲面に形成されている。   As shown in FIG. 3, the small-diameter shaft portion 30 is closer to the guide shaft portion 28 side of the small-diameter shaft portion 30 when the valve is opened than the shaft end 14 a on the intake port 12 side (lower side) of the valve guide 14. It is formed so that the shaft end 30a is located at a close position. As shown in FIG. 2, the end (upper end) on the guide shaft portion 28 side of the small diameter shaft portion 30 is an upper connection portion 31 a, and the end portion on the end shaft portion 29 side of the small diameter shaft portion 30. The (lower end) is a lower connection portion 31b. The outer peripheral surfaces of both connection portions 31a and 31b are formed into curved surfaces that are smoothly connected to both shaft portions 28 and 29, respectively.

前記弁傘部２２において、傘裏側（弁表面２２ａとは反対側）の外周部には、円環状のフェース面３２が形成されている。フェース面３２は、弁傘部２２の外周端から弁裏方向（図２において上方）に向かって小径化された断面を直線とする所定のテーパ角θ２のテーパ面に形成されている。なお、テーパ角θ２は、例えば４５°である。なお、テーパ角θ２は４５°に限定されない。   In the valve umbrella portion 22, an annular face surface 32 is formed on the outer peripheral portion on the umbrella back side (the side opposite to the valve surface 22 a). The face surface 32 is formed as a taper surface having a predetermined taper angle θ <b> 2 having a straight section as a cross-section reduced in diameter from the outer peripheral end of the valve head portion 22 toward the valve back direction (upward in FIG. 2). The taper angle θ2 is 45 °, for example. The taper angle θ2 is not limited to 45 °.

前記弁傘部２２の外周端には、フェース面３２の大径側の外径と同一の外径を有する円筒状で軸長の短い周端面３４が形成されている。また、弁傘部２２の傘裏側の外周部には、円環状の斜面３６が形成されている。斜面３６は、フェース面３２の小径側の外周端から弁裏方向（図２において上方）に向かって小径化された断面を直線とする所定のテーパ角（斜面角ともいう）θ３のテーパ面に形成されている。なお、斜面角θ３は、例えば１２．５である。なお、斜面角θ３は１２．５に限定されない。   At the outer peripheral end of the valve head portion 22, a cylindrical peripheral end surface 34 having the same outer diameter as the outer diameter on the large diameter side of the face surface 32 is formed. An annular slope 36 is formed on the outer peripheral portion of the valve umbrella portion 22 on the umbrella back side. The inclined surface 36 is a tapered surface having a predetermined taper angle (also referred to as an inclined surface angle) θ3 that has a straight line as a cross section reduced in diameter from the outer peripheral end on the small diameter side of the face surface 32 toward the valve back direction (upward in FIG. 2). Is formed. The slope angle θ3 is 12.5, for example. The slope angle θ3 is not limited to 12.5.

前記弁傘部２２の傘裏側には、前記テーパ部２６の大径側の外周端と前記斜面３６の小径側の外周端とをつなぐ凹曲面３８が形成されている。凹曲面３８は、断面を曲率半径Ｒの曲線で形成されている。曲率半径Ｒは、例えば７ｍｍである。なお、曲率半径Ｒは７ｍｍに限定されない。また、斜面３６と凹曲面３８とは本明細書でいう「傘裏部」を構成している。なお、図１及び図２中の符号、Ｌはエンジンバルブ２０の軸線を示す。   A concave curved surface 38 is formed on the umbrella back side of the valve umbrella portion 22 to connect the outer peripheral end of the tapered portion 26 on the large diameter side and the outer peripheral end of the inclined surface 36 on the small diameter side. The concave curved surface 38 is formed by a curve having a curvature radius R in cross section. The curvature radius R is, for example, 7 mm. The radius of curvature R is not limited to 7 mm. Further, the slope 36 and the concave curved surface 38 constitute an “umbrella back portion” as used in this specification. In FIG. 1 and FIG. 2, the symbol L indicates the axis of the engine valve 20.

前記エンジンバルブ２０の鍛造後、前記弁傘部２２のフェース面３２及び周端面３４、弁軸部２４（詳しくは、案内軸部２８、端軸部２９、小径軸部３０、環状溝２５を含む）の外周面に対して、機械加工（例えば研磨）が施されている。また、弁傘部２２のテーパ部２６及び傘裏部（斜面３６及び凹曲面３８）は、研磨することなく、鍛造肌のままとされている。また、弁表面２２ａからテーパ部２６の小径側の軸端までの高さＨ１は、弁軸部２４に対する研磨の弁傘部２２側（下側）の研磨端の高さＨ１に相当する。なお、弁傘部２２の周端面３４は研磨しない場合もある。また、弁軸部２４の軸端面（上端面）２４ａ（図１参照）は、研磨してもよいし、研磨しなくてもよい。   After forging the engine valve 20, the face surface 32 and the peripheral end surface 34 of the valve head portion 22, the valve shaft portion 24 (specifically, the guide shaft portion 28, the end shaft portion 29, the small diameter shaft portion 30, and the annular groove 25 are included. ) Is machined (for example, polished). Moreover, the taper part 26 and the umbrella back part (the slope 36 and the concave curved surface 38) of the valve head part 22 are left as forged skin, without grind | polishing. Further, the height H1 from the valve surface 22a to the shaft end on the small diameter side of the tapered portion 26 corresponds to the height H1 of the polishing end on the side of the valve head portion 22 (lower side) with respect to the valve shaft portion 24. The peripheral end surface 34 of the valve head portion 22 may not be polished. Further, the shaft end surface (upper end surface) 24a (see FIG. 1) of the valve shaft portion 24 may be polished or may not be polished.

前記した吸気用エンジンバルブ２０によると、鍛造により形成される弁傘部２２と弁軸部２４との間に、弁傘部２２側から弁軸部２４側に向かって小径化されかつ外周面が断面を直線とする所定のテーパ角θ１のテーパ面に形成されたテーパ部２６を有することによって、強度を向上することができる。これにより、弁軸部２４の小径軸部３０の軸長を長くし、吸気流量及びタンブル流を増加することができる。したがって、強度を確保するとともに吸気流量及びタンブル流を増加することができる。   According to the intake engine valve 20 described above, the diameter is reduced from the valve head portion 22 side to the valve shaft portion 24 side and the outer peripheral surface is between the valve head portion 22 and the valve shaft portion 24 formed by forging. By having the taper portion 26 formed on the taper surface having a predetermined taper angle θ <b> 1 having a straight section, the strength can be improved. Thereby, the axial length of the small diameter shaft part 30 of the valve shaft part 24 can be lengthened, and the intake flow rate and the tumble flow can be increased. Therefore, it is possible to secure the strength and increase the intake flow rate and the tumble flow.

また、テーパ部２６及び傘裏部（斜面３６及び凹曲面３８）が鍛造肌である。したがって、研磨等の機械加工により総加工する場合と比べて、加工工数を削減し、コストを低減することができる。   Moreover, the taper part 26 and the umbrella back part (the slope 36 and the concave curved surface 38) are forging skins. Therefore, compared with the case where total machining is performed by machining such as polishing, the number of processing steps can be reduced and the cost can be reduced.

また、小径軸部３０は、バルブガイド１４の吸気ポート１２側の軸端１４ａに対して、開弁時の小径軸部３０の案内軸部２８側の軸端３０ａが近接する位置に位置するように形成されている。したがって、吸気流量及びタンブル流を最大又は最大に近くまで増加することができる。また、開弁時の小径軸部３０の案内軸部２８側の軸端３０ａがバルブガイド１４内に入り込む位置に位置するように小径軸部３０を形成する場合と異なり、開弁時におけるバルブガイド１４に対する案内軸部２８の支持にかかる軸長の減少を防止することができる。   Further, the small-diameter shaft portion 30 is positioned so that the shaft end 30a on the guide shaft portion 28 side of the small-diameter shaft portion 30 at the time of valve opening is close to the shaft end 14a on the intake port 12 side of the valve guide 14. Is formed. Accordingly, the intake flow rate and the tumble flow can be increased to the maximum or close to the maximum. Unlike the case where the small-diameter shaft portion 30 is formed so that the shaft end 30a on the guide shaft portion 28 side of the small-diameter shaft portion 30 at the time of valve opening is located in the valve guide 14, the valve guide at the time of valve opening. 14 can be prevented from being reduced.

次に、前記エンジンバルブ２０を比較例のものと比較して説明する。図５は比較例の吸気用エンジンバルブの弁傘部の周辺部を示す正面図、図６が吸気用エンジンバルブの弁傘部の周辺部を比較例と比較して示す正面図である。図６において、実線は前記実施形態のエンジンバルブ（「実施例のエンジンバルブ」という）２０を示し、点線は比較例のエンジンバルブ（符号、１２０を付す）を示す。なお、比較例のエンジンバルブ１２０については、実施例のエンジンバルブ２０と同一部位には同一符号を付し、重複する説明を省略する。   Next, the engine valve 20 will be described in comparison with a comparative example. FIG. 5 is a front view showing a peripheral portion of the valve head portion of the intake engine valve of the comparative example, and FIG. 6 is a front view showing a peripheral portion of the valve head portion of the intake engine valve in comparison with the comparative example. In FIG. 6, the solid line indicates the engine valve (referred to as “engine valve of the example”) 20 of the above embodiment, and the dotted line indicates the engine valve (reference numeral 120) of the comparative example. In addition, about the engine valve 120 of a comparative example, the same code | symbol is attached | subjected to the same site | part as the engine valve 20 of an Example, and the overlapping description is abbreviate | omitted.

図５に示すように、比較例のエンジンバルブ１２０は、弁傘部１２２及び弁軸部１２４を有するものの、実施例のエンジンバルブ２０におけるテーパ部２６（図２参照）を有していない。また、エンジンバルブ１２０の弁軸部１２４は、実施例のエンジンバルブ２０における小径軸部３０（図２参照）が形成されていない。弁軸部１２４の外径１２４ｄは、実施例のエンジンバルブ２０における外径２４ｄと同一である。また、弁軸部１２４に対する研磨の弁傘部１２２側（下側）の研磨端の高さｈ１は、例えば１４ｍｍである。したがって、比較例の研磨端の高さｈ１の１４ｍｍに比べ、実施例の研磨端の高さＨ１（図２参照）が１０ｍｍに減少されている。   As shown in FIG. 5, the engine valve 120 of the comparative example has the valve head portion 122 and the valve shaft portion 124, but does not have the tapered portion 26 (see FIG. 2) in the engine valve 20 of the embodiment. Further, the valve shaft portion 124 of the engine valve 120 is not formed with the small diameter shaft portion 30 (see FIG. 2) in the engine valve 20 of the embodiment. The outer diameter 124d of the valve shaft portion 124 is the same as the outer diameter 24d in the engine valve 20 of the embodiment. The height h1 of the polishing end on the side of the valve stem portion 122 (lower side) with respect to the valve shaft portion 124 is, for example, 14 mm. Therefore, the height H1 (see FIG. 2) of the polishing end of the example is reduced to 10 mm, compared with 14 mm, which is the height h1 of the polishing end of the comparative example.

前記弁傘部１２２において、傘裏側の外周部には、実施例と同様、フェース面３２及び周端面３４が形成されている。また、弁傘部２２の傘裏側には、円環状の面取り斜面１３７が形成されている。面取り斜面１３７の面取り角θ４は、例えば３０°である。弁傘部２２の傘裏側には、前記弁軸部２４の弁傘部２２側（下側）の軸端の外周端と前記面取り斜面１３７の小径側の外周端とをつなぐ凹曲面１３８が形成されている。凹曲面１３８は、断面を曲率半径ｒとする曲線で形成されている。すなわち、比較例の面取り斜面１３７が実施例のエンジンバルブ２０では廃止されているとともに、比較例の凹曲面１３８の曲率半径ｒに比べ、実施例の凹曲面３８の曲率半径Ｒ（図２参照）が小径化されている。したがって、比較例の弁傘部１２２に比べ、実施例の弁傘部２２が薄肉化されている（図６参照）。また、比較例のエンジンバルブ１２０では、研磨等の機械加工により総加工されている。すなわち、エンジンバルブ１２０の総ての外周面に研磨等の機械加工が施されている。   In the valve umbrella portion 122, a face surface 32 and a peripheral end surface 34 are formed on the outer peripheral portion on the back side of the umbrella, as in the embodiment. An annular chamfered slope 137 is formed on the umbrella back side of the valve umbrella portion 22. The chamfer angle θ4 of the chamfered slope 137 is, for example, 30 °. A concave curved surface 138 is formed on the umbrella back side of the valve umbrella portion 22 to connect the outer peripheral end of the valve shaft portion 24 side (lower side) of the valve shaft portion 24 and the outer peripheral end of the chamfered inclined surface 137 on the small diameter side. Has been. The concave curved surface 138 is formed by a curve having a cross section as a curvature radius r. That is, the chamfered slope 137 of the comparative example is abolished in the engine valve 20 of the embodiment, and the radius of curvature R of the concave curved surface 38 of the embodiment is compared with the radius of curvature r of the concave curved surface 138 of the comparative example (see FIG. 2). Is reduced in diameter. Therefore, compared with the valve head part 122 of a comparative example, the valve head part 22 of an Example is thinned (refer FIG. 6). Further, the engine valve 120 of the comparative example is totally processed by machining such as polishing. That is, all the outer peripheral surfaces of the engine valve 120 are machined such as polishing.

実施例のエンジンバルブ２０によると、比較例のエンジンバルブ１２０と異なり、弁軸部２４にテーパ部２６を有することにより、強度を向上することができる。これにより、弁軸部２４の小径軸部３０の軸長を長くし、吸気流量及びタンブル流を増加することができる。また、エンジンバルブ２０によると、テーパ部２６及び傘裏部（斜面３６及び凹曲面３８）が鍛造肌である。したがって、研磨等の機械加工により総加工する比較例のエンジンバルブ１２０と比べて、加工工数を削減し、コストを低減することができる。また、エンジンバルブ２０によると、比較例のエンジンバルブ１２０に比べ、弁傘部２２が薄肉化されているとともに、研磨端の高さＨ１が減少されている。これにより、弁軸部２４の小径軸部３０の軸長を長くし、吸気流量及びタンブル流を増加することができる。これとともに、エンジンバルブ２０を軽量化することができる。   According to the engine valve 20 of the embodiment, unlike the engine valve 120 of the comparative example, the strength can be improved by having the tapered portion 26 in the valve shaft portion 24. Thereby, the axial length of the small diameter shaft part 30 of the valve shaft part 24 can be lengthened, and the intake flow rate and the tumble flow can be increased. Moreover, according to the engine valve 20, the taper part 26 and the umbrella back part (the slope 36 and the concave curved surface 38) are forging skins. Therefore, compared with the engine valve 120 of the comparative example that performs total machining by machining such as polishing, the number of machining steps can be reduced and the cost can be reduced. Further, according to the engine valve 20, the valve head portion 22 is made thinner and the polished end height H1 is reduced as compared with the engine valve 120 of the comparative example. Thereby, the axial length of the small diameter shaft part 30 of the valve shaft part 24 can be lengthened, and the intake flow rate and the tumble flow can be increased. At the same time, the engine valve 20 can be reduced in weight.

本発明は上記した実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲における変更が可能である。   The present invention is not limited to the above-described embodiment, and modifications can be made without departing from the gist of the present invention.

１０…シリンダヘッド
１２…吸気ポート
１３…バルブシート
１４…バルブガイド
１４ａ…軸端
２０…吸気用エンジンバルブ
２２…弁傘部
２４…弁軸部
２６…テーパ部
２８…案内軸部
３０…小径軸部
３０ａ…軸端
３６…斜面（傘裏部の一部）
３８…凹曲面（傘裏部の一部）
DESCRIPTION OF SYMBOLS 10 ... Cylinder head 12 ... Intake port 13 ... Valve seat 14 ... Valve guide 14a ... Shaft end 20 ... Intake engine valve 22 ... Valve head part 24 ... Valve shaft part 26 ... Tapered part 28 ... Guide shaft part 30 ... Small diameter shaft part 30a ... shaft end 36 ... slope (part of umbrella back)
38 ... concave curved surface (part of umbrella back)

Claims (3)

鍛造により形成された弁傘部及び弁軸部を有し、エンジンの吸気ポートを開閉する吸気用エンジンバルブであって、
前記弁傘部と前記弁軸部との間に、弁傘部側から弁軸部側に向かって小径化されかつ外周面が断面を直線とする所定のテーパ角のテーパ面に形成されたテーパ部を有し、
前記弁軸部において、前記エンジンのバルブガイドにより案内される案内軸部と前記テーパ部側の端軸部との間に、それらの軸部の外径よりも小さい外径の小径軸部を形成した
ことを特徴とする吸気用エンジンバルブ。 An intake engine valve having a valve head portion and a valve stem portion formed by forging, and opening and closing an intake port of the engine,
A taper formed between the valve head portion and the valve shaft portion with a taper surface having a predetermined taper angle with a reduced diameter from the valve head portion side toward the valve shaft portion side and an outer peripheral surface having a straight section. Part
In the valve shaft portion, a small-diameter shaft portion having an outer diameter smaller than the outer diameter of the shaft portion is formed between the guide shaft portion guided by the valve guide of the engine and the end shaft portion on the tapered portion side. This is an intake engine valve. 請求項１に記載の吸気用エンジンバルブであって、
前記テーパ部及び前記傘裏部が鍛造肌であることを特徴とする吸気用エンジンバルブ。 The intake engine valve according to claim 1,
The intake engine valve, wherein the tapered portion and the umbrella back portion are forged skin. 請求項１又は２に記載の吸気用エンジンバルブであって、
前記小径軸部は、前記バルブガイドの吸気ポート側の軸端に対して、開弁時の該小径軸部の案内軸部側の軸端が近接する位置に位置するように形成されていることを特徴とする吸気用エンジンバルブ。
The intake engine valve according to claim 1 or 2,
The small-diameter shaft portion is formed such that the shaft end on the guide shaft portion side of the small-diameter shaft portion is close to the shaft end on the intake port side of the valve guide. Engine valve for intake.
JP2012117368A 2012-05-23 2012-05-23 Engine valve for intake Active JP5964134B2 (en)

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