JPS59231122A - Valve cap - Google Patents

Valve cap

Info

Publication number
JPS59231122A
JPS59231122A JP10724983A JP10724983A JPS59231122A JP S59231122 A JPS59231122 A JP S59231122A JP 10724983 A JP10724983 A JP 10724983A JP 10724983 A JP10724983 A JP 10724983A JP S59231122 A JPS59231122 A JP S59231122A
Authority
JP
Japan
Prior art keywords
valve
valve cap
wall portion
side wall
bottom wall
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.)
Pending
Application number
JP10724983A
Other languages
Japanese (ja)
Inventor
Yoshikazu Ishikawa
義和 石川
Yasutoshi Umemura
梅村 泰年
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP10724983A priority Critical patent/JPS59231122A/en
Publication of JPS59231122A publication Critical patent/JPS59231122A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00Lift-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
    • F01L3/20Shapes or constructions of valve members, not provided for in preceding subgroups of this group

Abstract

PURPOSE:To enable to work a valve cap without machining such as cutting and the like by a structure wherein the side wall part of the valve cap is formed by a plurality of leafed parts extending in the direction of the axis of a valve stem. CONSTITUTION:A valve cap 11 consists of a bottom wall part 12, which abuts against the edge face of a valve stem end, and a side wall part 13, which slidingly contacts wih the outer side surface of the stem end. The side wall part 13 is made of a plurality of plane parts formed by a plurality of notches extending in the direction of the axis of a valve stem. Due to the structure as mentioned above, press working can be employed in the manufacture of the valve cap, resulting in enabling to eliminate the machining such as cutting and the like and accordingly to realize the reduction of working man-hours and of manufacturing cost.

Description

【発明の詳細な説明】 (従来分野) この発明はバルブキャップ、詳しくは内燃機関の吸、排
気バルブのステムエンドに嵌合されるバルブキャップに
関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve cap, and more particularly to a valve cap that is fitted to the stem end of an intake or exhaust valve of an internal combustion engine.

(従来技術) 一般に、バルブキャップは吸、排気バルブのステムエン
ドに嵌合されて、該ステムエンドに当接するタペット、
リフター、口・ツカアーム等との間のクリアランスを調
整するものである。
(Prior Art) In general, a valve cap is fitted onto a stem end of an intake or exhaust valve, and includes a tappet that abuts the stem end.
This is to adjust the clearance between the lifter, mouth, jaw arm, etc.

従来のバルブキャップ(ステムキャップとも称す)とし
ては例えば第1図に示すようなものが使用されている(
日産自動車■1982年発行、r F J 20型エン
ジン整備要領書」等参照)。このバルブキャップ1は有
底円筒状の部材であり、バルブのステムエンドの先端面
に当接する底壁部2と、該ステムエンドの外周側面に摺
接する円筒状の側壁部3と、から構成されている。この
底壁部2はステムエンドの先端面と例えばタペットの底
面との間に挾まれてこれらのクリアランスを調整するた
め、その厚みは厳しく管理されており、かつ、耐摩耗性
、硬度等が要求されている。したがワて、このバルブキ
ャップ1の製造は鋳造品に切削加工を施して、さらに底
壁部2には軟窒化処理(タフトライド処理)を行ってい
る。
For example, the one shown in Figure 1 is used as a conventional valve cap (also called a stem cap).
(Refer to Nissan Motor Co., Ltd., ``R F J 20 Type Engine Maintenance Manual, published in 1982, etc.''). This valve cap 1 is a cylindrical member with a bottom, and is composed of a bottom wall portion 2 that comes into contact with the distal end surface of the stem end of the valve, and a cylindrical side wall portion 3 that comes into sliding contact with the outer circumferential side of the stem end. ing. This bottom wall part 2 is sandwiched between the tip of the stem end and the bottom of the tappet, for example, and adjusts the clearance between them, so its thickness is strictly controlled, and it is required to have wear resistance, hardness, etc. has been done. Therefore, the valve cap 1 is manufactured by cutting a cast product, and further, the bottom wall portion 2 is subjected to soft nitriding treatment (tuftride treatment).

しかしながら、このような従来のバルブキャップにあっ
ては、キャップ自体が完全な円筒形状であったため、切
削加工、(特にその底壁部2)が極めて困難であり、ま
た、液体軟窒化処理では底面は液体が循環しにくいので
硬度を増すことが困難であり、これらの結果、コスト高
となるという問題点が生じていた。
However, with such conventional valve caps, since the cap itself was completely cylindrical, it was extremely difficult to cut the bottom wall (particularly the bottom wall 2). Since it is difficult for the liquid to circulate, it is difficult to increase the hardness, and as a result, there has been a problem in that the cost is high.

(発明の目的) そこで、この発明は、側壁部をバルブステムの軸方向に
延在する複数の片状部分で形成したバルブキャップを提
供することにより、プレス加工を可能としコストダウン
を図ることを目的としている。
(Object of the Invention) Therefore, the present invention aims to reduce costs by providing a valve cap in which the side wall portion is formed of a plurality of piece-like parts extending in the axial direction of the valve stem. The purpose is

(発明の構成) この発明に係るバルブキャンプは、バルブのステムエン
ドに嵌合されるものであり、該ステムエンドの先端面に
当接する底壁部と、該ステムエンドの外側面に摺接する
側壁部と、を有している。この側壁部はバルブステムの
軸方向に延在する複数の切欠きによって複数の片状部分
で形成されている。
(Structure of the Invention) The valve camp according to the present invention is fitted to a stem end of a valve, and includes a bottom wall portion that comes into contact with the distal end surface of the stem end, and a side wall that comes into sliding contact with the outer surface of the stem end. It has a section and. This side wall portion is formed by a plurality of strips formed by a plurality of notches extending in the axial direction of the valve stem.

(実施例) 以下、この発明を図面に基づいて説明する。(Example) The present invention will be explained below based on the drawings.

第2図〜第4図はこの発明に係るバルブキャップの一実
施例を示すものである。第2図〜第4図において、バル
ブキャンプ11は、バルブのステムエンドに嵌合される
ものであり、ステムエンドの先端面に当接する底壁部1
2と、該ステムエンドの外側面に71接する側壁部I3
と、を有している。すなわち、バルブキャップ11はバ
ルブステムエンドが円柱状に形成されているので、略円
筒形状に形成されている(側壁部13は底壁部12に対
して垂直に形成されている)。この側壁部13は、その
円周方向において180度離隔した部分がその軸方向に
延在する平行な2つの平面(底壁部]2に垂直な平面)
で切り落され(したがって、この切り落された後の空間
がバルブステムの軸方向に延在する一対の切欠き14A
、14Bを形成することになる。)、一対の片状部分1
3A、13Bで形成されている。これらの片状部分13
A、13Bは切欠き14A、14Bと同様に180度離
隔して、がっ、バルブステムの軸方向に延在しており、
底壁部12の曲率と同一の曲率で円周方向に湾曲してい
る。なお、この底壁部12も上記平面により切り落され
て略長円形となっている。また、このバルブキャップ1
1の材料は例えばspc等の鋼板を使用し、浸炭焼入れ
又は軟窒化処理等の表面硬化処理が施されている。さら
に、底壁部12の表裏両面は精密仕上が施されており、
その厚みは厳密に管理されている。
FIGS. 2 to 4 show an embodiment of a valve cap according to the present invention. In FIGS. 2 to 4, the valve camp 11 is fitted into the stem end of the valve, and includes a bottom wall portion 1 that comes into contact with the distal end surface of the stem end.
2, and a side wall portion I3 that contacts the outer surface of the stem end by 71.
It has . That is, since the valve stem end is formed in a cylindrical shape, the valve cap 11 is formed in a substantially cylindrical shape (the side wall portion 13 is formed perpendicular to the bottom wall portion 12). This side wall portion 13 has two parallel planes (planes perpendicular to the bottom wall portion 2) in which portions separated by 180 degrees in the circumferential direction extend in the axial direction.
(Therefore, a pair of notches 14A whose space after being cut extends in the axial direction of the valve stem)
, 14B. ), a pair of flakes 1
It is formed by 3A and 13B. These flakes 13
Similar to the notches 14A and 14B, the notches A and 13B are separated by 180 degrees and extend in the axial direction of the valve stem.
It is curved in the circumferential direction with the same curvature as the curvature of the bottom wall part 12. Note that this bottom wall portion 12 is also cut off by the above-mentioned plane to form a substantially oval shape. Also, this valve cap 1
For example, a steel plate such as SPC is used as the material of No. 1, and is subjected to surface hardening treatment such as carburizing and quenching or soft nitriding treatment. Furthermore, both the front and back sides of the bottom wall portion 12 are precision finished.
Its thickness is strictly controlled.

次に、作用について説明する。。Next, the effect will be explained. .

まず、このバルブキャップ11は一枚の鋼板をプレスに
より所定形状(略帯状)に打抜き、その両端部を中央部
に対して略垂直に折り曲げる。このとき、両端部はその
短手方向に所定曲率で湾曲される(絞り加工)。また、
この場合中央部の厚みは所定値に形成している。この結
果、両端部は一対の片状部分13A、13Bからなる側
壁部13を中央部は底壁部12をそれぞれ形成すること
になる。次いで、該バルブキャップ11に液体軟窒化処
理を施す。この場合、側壁部13には切欠き14A、1
4Bが形成されているため、底壁部120表裏両面にも
十分に液体が循環し、その結果、この底壁部12の表面
硬化処理を十分に行うことができる。ずなわち、底壁部
12の表裏両面に一様の硬度を得ることができる。よっ
て、バルブのステムエンドに該バルブキャップ11を嵌
合した場合、該ステムエンドの先端面に当接する底壁部
12の裏面の硬度不足は生じず、その耐摩耗性は向上す
る。また、嵌合時、側壁部13は湾曲した二葉の片状部
分13A、13Bがバルブステムの外側面に摺接するの
で離脱等の虞れはない。なお、底壁部12の厚みを変更
するには材料である板材の厚みを変更すればよく、極め
て容易となる。
First, the valve cap 11 is made by punching a steel plate into a predetermined shape (approximately a belt shape) using a press, and then bending both ends of the sheet approximately perpendicularly to the center. At this time, both ends are curved at a predetermined curvature in the lateral direction (drawing). Also,
In this case, the thickness of the central portion is set to a predetermined value. As a result, both end portions form a side wall portion 13 consisting of a pair of piece-shaped portions 13A and 13B, and the center portion forms a bottom wall portion 12, respectively. Next, the valve cap 11 is subjected to liquid soft nitriding treatment. In this case, the side wall portion 13 has notches 14A, 1
4B, the liquid circulates sufficiently on both the front and back surfaces of the bottom wall portion 120, and as a result, the surface of the bottom wall portion 12 can be sufficiently hardened. In other words, uniform hardness can be obtained on both the front and back surfaces of the bottom wall portion 12. Therefore, when the valve cap 11 is fitted to the stem end of the valve, the hardness of the back surface of the bottom wall portion 12 that comes into contact with the distal end surface of the stem end is not insufficient, and its wear resistance is improved. Further, when the side wall portion 13 is fitted, the curved two-lobed piece portions 13A and 13B are in sliding contact with the outer surface of the valve stem, so there is no risk of them coming off. In addition, in order to change the thickness of the bottom wall part 12, it is only necessary to change the thickness of the plate material, which is extremely easy.

第5図および第6図はこの発明の他の実施例を示してい
る。この実施例は円周方向に等間隔に配設された三葉の
片状部分23A、23B、23Cにより側壁部23を形
成したバルブキャップ21の例である。よって各片状部
分23A、23B、23Cの間は切欠き24A、24B
、24Cとなる。この場合、底壁部22はほぼ円形とな
っている。その他の構成、作用は前記実施例と同様であ
る。なお、この場合、片状部分23A、23B、23C
はその短手方向に湾曲させていないため絞り加工等が不
要となり、材料としてもSK材等の硬いものを使用でき
表面硬化処理を廃止することも可能となる。
5 and 6 show other embodiments of the invention. This embodiment is an example of a valve cap 21 in which a side wall portion 23 is formed by trilobal pieces 23A, 23B, and 23C arranged at equal intervals in the circumferential direction. Therefore, there are cutouts 24A, 24B between each piece-shaped portion 23A, 23B, 23C.
, 24C. In this case, the bottom wall portion 22 is approximately circular. Other configurations and functions are the same as those of the previous embodiment. In addition, in this case, the flaky portions 23A, 23B, 23C
Since it is not curved in the transverse direction, there is no need for drawing or the like, and a hard material such as SK material can be used, making it possible to eliminate surface hardening treatment.

また、上記切欠きは略長方形に限らず台形等とすること
もできる。さらに、第3.5図中りはバルブステムエン
ドの径を示している。
Moreover, the above-mentioned notch is not limited to a substantially rectangular shape, but may also be trapezoidal or the like. Furthermore, the middle part of Fig. 3.5 shows the diameter of the valve stem end.

(効果) 以上説明してきたように、この発明によれば、バルブキ
ャップの製作においてプレス加工が可能となり、切削等
の機械加工を廃止でき、加工工数の低減およびバルブキ
ャップの大幅なコストダウンを実現できた。また、表面
硬化処理も容易となり、耐摩耗性等をも向上できる。
(Effects) As explained above, according to the present invention, press processing is possible in the production of valve caps, eliminating machining such as cutting, reducing the number of processing steps and significantly reducing the cost of valve caps. did it. Moreover, surface hardening treatment becomes easy, and wear resistance etc. can also be improved.

さらに、第2〜4図の実施例では材料歩留りが向上する
という効果があり、第5.6図のそれは上述のように表
面硬化処理をも廃止できるという効果がある。
Furthermore, the embodiments shown in FIGS. 2 to 4 have the effect of improving the material yield, and the embodiment shown in FIG. 5.6 has the effect of eliminating the surface hardening treatment as described above.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は従来のバルブキャップを示す斜視図、第2図は
本発明のバルブキャップの一実施例を示すその斜視図、
第3図は同実施例の平面図、第4図は第3図のIV−I
V矢視断面図、第5図は本発明の他の実施例を示すバル
ブキャップの平面図、第6図は第5図のVl−VT矢視
断面図である。 11.21−−−−−−バルブキャップ、12.22・
−・・底壁部、 13、詔・・−−−一側壁部、 13A、13B、23A、23B、23C−−−−一片
状部分、 14A、14B、24A、24B、24C−−−切欠き
。 特許出願人      日産自動車株式会社代理人弁理
士 有我軍一部 第1図 13  第2図 〆 13A、I+ 13B  ”” 第3図 第4図 6B
FIG. 1 is a perspective view showing a conventional valve cap, FIG. 2 is a perspective view showing an embodiment of the valve cap of the present invention,
Figure 3 is a plan view of the same embodiment, and Figure 4 is IV-I of Figure 3.
5 is a plan view of a valve cap showing another embodiment of the present invention, and FIG. 6 is a sectional view taken along the line Vl-VT in FIG. 5. 11.21------Valve cap, 12.22・
---Bottom wall portion, 13, Imperial Rule...--One side wall portion, 13A, 13B, 23A, 23B, 23C---- Piece-shaped portion, 14A, 14B, 24A, 24B, 24C----Cut Missing. Patent Applicant Nissan Motor Co., Ltd. Representative Patent Attorney Yugagun Part Figure 1 13 Figure 2 13A, I+ 13B "" Figure 3 Figure 4 Figure 6B

Claims (1)

【特許請求の範囲】[Claims] バルブのステムエンドに嵌合されて、該ステムエンドの
先端面に当接する底壁部と、該ステムエンドの外側面に
摺接する側壁部と、を有するバルブキャップにおいて、
前記側壁部をバルブステムの軸方向に延在する複数の切
欠きにより複数の片状部分で形成したことを特徴とする
バルブキャップ。
A valve cap having a bottom wall portion that is fitted into a stem end of the valve and comes into contact with a distal end surface of the stem end, and a side wall portion that comes into sliding contact with an outer surface of the stem end,
A valve cap characterized in that the side wall portion is formed of a plurality of piece-shaped portions with a plurality of notches extending in the axial direction of the valve stem.
JP10724983A 1983-06-15 1983-06-15 Valve cap Pending JPS59231122A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10724983A JPS59231122A (en) 1983-06-15 1983-06-15 Valve cap

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10724983A JPS59231122A (en) 1983-06-15 1983-06-15 Valve cap

Publications (1)

Publication Number Publication Date
JPS59231122A true JPS59231122A (en) 1984-12-25

Family

ID=14454257

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10724983A Pending JPS59231122A (en) 1983-06-15 1983-06-15 Valve cap

Country Status (1)

Country Link
JP (1) JPS59231122A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005188358A (en) * 2003-12-25 2005-07-14 Otics Corp Valve cap and valve lifter
JP2008528891A (en) * 2005-01-27 2008-07-31 シャエフラー カーゲー Electromagnetic hydraulic valve
JP2016188616A (en) * 2015-03-30 2016-11-04 株式会社クボタ Engine valve device
JP2016188615A (en) * 2015-03-30 2016-11-04 株式会社クボタ Engine valve device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005188358A (en) * 2003-12-25 2005-07-14 Otics Corp Valve cap and valve lifter
JP2008528891A (en) * 2005-01-27 2008-07-31 シャエフラー カーゲー Electromagnetic hydraulic valve
JP2016188616A (en) * 2015-03-30 2016-11-04 株式会社クボタ Engine valve device
JP2016188615A (en) * 2015-03-30 2016-11-04 株式会社クボタ Engine valve device

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