JPS63100204A - Valve lifter of overhead cam type internal combustion engine - Google Patents
Valve lifter of overhead cam type internal combustion engineInfo
- Publication number
- JPS63100204A JPS63100204A JP24412486A JP24412486A JPS63100204A JP S63100204 A JPS63100204 A JP S63100204A JP 24412486 A JP24412486 A JP 24412486A JP 24412486 A JP24412486 A JP 24412486A JP S63100204 A JPS63100204 A JP S63100204A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- valve lifter
- lifter
- wall portion
- stem
- 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
Links
- 238000002485 combustion reaction Methods 0.000 title claims description 4
- 230000005496 eutectics Effects 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims description 13
- 230000003746 surface roughness Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 abstract description 4
- 238000010273 cold forging Methods 0.000 abstract description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 238000007790 scraping Methods 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
- F01L1/143—Tappets; Push rods for use with overhead camshafts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
【発明の詳細な説明】
Ｃ産業上の利用分野〕
本発明は、オーバヘッドカム形内燃機関において、その
動弁カムとバルブのステム部との間に介在されるバルブ
リフタに関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a valve lifter interposed between a valve operating cam and a valve stem in an overhead cam type internal combustion engine.
この種のバルブリフタは、エンジン運転中、バルブと共
に往復運動を繰返し、慣性質量を形成するので、機械的
な強度を高めて耐摩耗性を充分に確保した上で、なるべ
く軽量化することが望まれる。This type of valve lifter repeatedly moves back and forth with the valve during engine operation, forming an inertial mass, so it is desirable to reduce the weight as much as possible while increasing mechanical strength and ensuring sufficient wear resistance. .
このことから、最近本出願人は、バルブリフタ全体を、
共晶炭化物が分散して晶出された合金工具鋼により鍛造
成形することを提案し、既に特願昭６１−９７５８３号
として出願を完了している。For this reason, the applicant has recently developed a valve lifter as a whole.
He proposed forging and forming an alloy tool steel in which eutectic carbides were dispersed and crystallized, and has already filed an application as Japanese Patent Application No. 1983-97583.
ところで、上記合金工具鋼は、第４図に示した顕ｒＪｉ
ｍ写真のように、白く粒状に見える共晶炭化物の結晶が
、尖鋭で比較的大きな形状を有しているために、この合
金工具鋼でバルブリフタを作ると、リフタ表面の面粗度
が大きなものとなってしまう。このため、上記先行技術
では、バルブリフタの鍛造成形後に、シリンダヘッドと
摺接する外周面や動弁カムと摺接する端面を研磨し、面
粗度を小さくして滑らかに仕上げることが行なわれてい
る。By the way, the above-mentioned alloy tool steel has the characteristics shown in Fig. 4.
As shown in the photo, the white granular eutectic carbide crystals have a sharp and relatively large shape, so when a valve lifter is made from this alloy tool steel, the lifter surface has a large surface roughness. It becomes. For this reason, in the above-mentioned prior art, after the valve lifter is forged, the outer circumferential surface that makes sliding contact with the cylinder head and the end surface that makes sliding contact with the valve drive cam are polished to reduce the surface roughness and give a smooth finish.
また、逆にバルブリフタの内面は、バルブスプリングが
近接しているのみで、溶接面とはなり得ないために、格
別な研磨加工は必要ないとされ、鍛造成形したままの粗
面となっていた。On the other hand, the inner surface of the valve lifter was considered to require no special polishing, as the valve spring was only in close proximity and could not be used as a welding surface. .
ところが、バルブスプリングは、エンジン運転中、伸縮
を繰返すために、このバルブスプリングがバルブリフタ
の内面に接触することがあり得る。However, since the valve spring repeatedly expands and contracts during engine operation, the valve spring may come into contact with the inner surface of the valve lifter.
すると、バルブリフタの内面は、高硬度の粗面のままと
なっているために、バルブスプリングとの接触部分に大
きなａｍ抵抗が生じ、このバルブスプリングが削り取ら
れて、微細な削り屑が発生したり、共晶炭化物が脱落す
ることがあった。Then, since the inner surface of the valve lifter remains a highly hard and rough surface, a large am resistance is generated at the contact area with the valve spring, and the valve spring is scraped off, generating fine shavings. , the eutectic carbide sometimes fell off.
このため、削り屑や脱落した共晶炭化物が、ステム部と
バルブガイドとの間に噛み込まれることがあり、バルブ
の円滑な作動が妨げられたり、ステム部が異常摩耗を起
す等の問題があった。As a result, shavings and fallen eutectic carbides may become trapped between the stem and the valve guide, which may prevent smooth operation of the valve or cause abnormal wear of the stem. there were.
そこで、本発明においては、バルブリフタを、共晶炭化
物が分散して晶出された鋼材にて構成するに当り、その
少なくとも胴部の内面を、面粗度の小さな平滑面に仕上
げたことを特徴とする。Therefore, in the present invention, when the valve lifter is constructed of a steel material in which eutectic carbide is dispersed and crystallized, at least the inner surface of the body is finished with a smooth surface with small surface roughness. shall be.
この構成によれば、バルブスプリングと近接する面の面
粗度が小さくなるので、バルブの開閉作動中、胴部の内
面にバルブスプリングが接触したとしても、この接触部
に生じる＊ｍ抵抗は小さくて済むことになる。このため
、バルブスプリングが削り取られたり、共晶炭化物が脱
落することは殆んどな（なり、ステム部の摺動部分に、
削り粕や脱落した炭化物が噛み込まれるのを未然に防止
することができる。According to this configuration, the surface roughness of the surface adjacent to the valve spring is reduced, so even if the valve spring comes into contact with the inner surface of the body during the opening/closing operation of the valve, the *m resistance generated at this contact portion is small. It will be done. For this reason, it is almost impossible for the valve spring to be scraped off or the eutectic carbide to fall off (as a result, the sliding part of the stem
It is possible to prevent shavings and fallen carbide from being bitten.
以下本発明の一実施例を、第１図ないし第３図にもとづ
いて説明する。An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.
第１図中筒号１は吸気又は排気用のバルブであり、この
バルブ１のステム部２は、シリンダヘッド３に固定した
バルブガイド４に摺動可能に支持されている。ステム部
２の先端側外周には、バルブスプリング５が設けられて
おり、このバルブスプリング５は、ステム部２の先端部
に固定したスプリング受け６に圧接して、ステム部２を
閉止方向に付勢している。Reference number 1 in FIG. 1 is an intake or exhaust valve, and a stem portion 2 of this valve 1 is slidably supported by a valve guide 4 fixed to a cylinder head 3. A valve spring 5 is provided on the outer periphery of the distal end of the stem portion 2, and this valve spring 5 comes into pressure contact with a spring receiver 6 fixed to the distal end of the stem portion 2, and causes the stem portion 2 to move in the closing direction. It is strong.
また、ステム部２の軸線上には、動弁カム７を有したカ
ム軸８が配置されており、この動弁カム７とステム部２
との間には、本発明に係るバルブリフタ９が介在されて
いる。Further, a camshaft 8 having a valve driving cam 7 is disposed on the axis of the stem portion 2, and this valve driving cam 7 and the stem portion 2
A valve lifter 9 according to the present invention is interposed between the two.
バルブリフタ９は、シリンダヘッド３のガイド孔１０に
摺動可能に嵌合された円筒状の胴部１１と、上記動弁カ
ム１が摺接する平滑な押圧壁部１２とからなり、この動
弁カム７の形状に応じてガイド孔１０内をバルブ１と共
に往復動される。そして、この胴部１１の内側にバルブ
スプリング５が挿通配置されており、このバルブスプリ
ング５は胴部１１の内面に対し極めて近接しているとと
もに、上記押圧壁部１２の下面中央部には、ステム部２
の先端面を受ける突部１３が一体に突設されている。The valve lifter 9 consists of a cylindrical body portion 11 that is slidably fitted into a guide hole 10 of the cylinder head 3, and a smooth pressing wall portion 12 on which the valve cam 1 slides. It is reciprocated together with the valve 1 within the guide hole 10 according to the shape of the valve 7. A valve spring 5 is inserted through the inside of the body 11, and the valve spring 5 is very close to the inner surface of the body 11. At the center of the lower surface of the pressing wall 12, Stem part 2
A protrusion 13 is integrally provided to receive the distal end surface of the protrusion.
なお、本実施例の場合、突部１３と押圧壁部１２の下面
、どの連続部は、曲率半径Ｒが０．５ａｍ以上の曲面１
４に形成されているとともに、胴部１１の内面と押圧壁
部１２の下面との連続部分も、滑らかな曲面１５に形成
されている。In the case of this embodiment, which continuous portion of the lower surface of the protrusion 13 and the pressing wall portion 12 is connected to the curved surface 1 with a radius of curvature R of 0.5 am or more.
4, and a continuous portion between the inner surface of the body portion 11 and the lower surface of the pressing wall portion 12 is also formed into a smooth curved surface 15.
ところで、このようなバルブリフタ９は、共晶炭化物の
含有員が多く、かつこの共晶炭化物が組織中に分散して
晶出された硬質の鋼材、例えば５ＫＤＩＩ等の合金工具
鋼を冷間鍛造することにより構成され、そのガイド孔１
０と摺接する胴部１１の外周面および動弁カム７と摺接
する押圧壁部１２の上面は、研磨されて滑らかに仕上げ
られている。By the way, such a valve lifter 9 is made by cold forging a hard steel material containing a large amount of eutectic carbide and in which the eutectic carbide is dispersed and crystallized in the structure, for example, an alloy tool steel such as 5KDII. The guide hole 1
The outer circumferential surface of the body portion 11 that comes into sliding contact with the valve drive cam 7 and the upper surface of the pressing wall portion 12 that comes into sliding contact with the valve operating cam 7 are polished and finished smoothly.
なお、この胴部１１には、研磨後において、その摺接面
となる外周面を硬化させて耐摩耗性を高めるための窒化
処理が施されている。Note that, after polishing, the body portion 11 is subjected to a nitriding treatment to harden the outer circumferential surface that becomes the sliding contact surface and improve wear resistance.
そして、本実施例のバルブリフタ９の場合、バルブスプ
リング５と近接する胴部１１の内面および押圧壁部１２
の下面には、研削加工が施されており、このため、バル
ブリフタ９の内面全面は、面粗度が小さい滑らかな平滑
面１７に仕上げられている。In the case of the valve lifter 9 of this embodiment, the inner surface of the body portion 11 and the pressing wall portion 12 adjacent to the valve spring 5 are
The lower surface of the valve lifter 9 is ground, so that the entire inner surface of the valve lifter 9 is finished into a smooth surface 17 with low surface roughness.
第３図に示す写真は、胴部１１を断面した部分の金属組
織を、４００倍に拡大して示す顕微鏡写真であり、この
写真中白く粒状に見える部分が共晶炭化物の晶出部分で
、金属組織全体に口って略均等に分散されていることが
分る。また、この写真中、横方向に沿って黒く一直線状
に延びる部分が胴部１１の内面を示している。この内面
上においては、晶出された共晶炭化物が金属組織と共に
削り取られており、凹凸の少ない、つまり、面粗度が小
ざい滑らかな面に仕上げられている。The photograph shown in FIG. 3 is a microscopic photograph showing the metal structure of a section of the body 11 magnified 400 times. It can be seen that it is almost evenly distributed throughout the metal structure. Further, in this photograph, the black portion extending in a straight line along the lateral direction indicates the inner surface of the body portion 11. On this inner surface, the crystallized eutectic carbide is scraped off together with the metal structure, resulting in a smooth surface with few irregularities, that is, with small surface roughness.
なお、このような研削加工は、押圧壁部１２の突部１３
にも施されており、ステム部２と接する面の面粗度も小
さく保たれている。In addition, such grinding process is performed on the protrusion 13 of the pressing wall portion 12.
The surface roughness of the surface in contact with the stem portion 2 is also kept small.
このような構成によれば、バルブスプリング５に近接す
るバルブリフタ９の内面を、面粗度の小さな平滑面１７
に仕上げたので、バルブ２の開閉作動中、胴部１１の内
面にバルブスプリング５が接触したとしても、この接触
部に生じる摩擦抵抗は小さく抑えられる。このため、バ
ルブスプリング５が削り取られたり、共晶炭化物が脱落
することは殆んどなくなり、ステム部２とバルブガイド
４との間に、バルブスプリング５の削り粕や共晶炭化物
が噛み込まれるといった従来の不具合を解消できる。According to such a configuration, the inner surface of the valve lifter 9 adjacent to the valve spring 5 is formed into a smooth surface 17 with small surface roughness.
Therefore, even if the valve spring 5 comes into contact with the inner surface of the body portion 11 during the opening/closing operation of the valve 2, the frictional resistance generated at this contact portion can be suppressed to a small level. Therefore, the valve spring 5 is hardly scraped off or the eutectic carbide falls off, and the scraps and eutectic carbide of the valve spring 5 are caught between the stem portion 2 and the valve guide 4. Conventional problems such as these can be resolved.
したがって、ステム部２の摺動不良や異常摩耗を防止す
ることができる。Therefore, poor sliding and abnormal wear of the stem portion 2 can be prevented.
また、バルブリフタ９の内面を研削したことにより、胴
部１１や押圧壁部１２の肉厚を始めとして、これら胴部
１１と押圧壁ＰＡ１２との連続部分の曲率も高開度に管
理することが可能となり、製品毎の強度やｌｆｆ１のば
らつきが少なくなる利点もある。Furthermore, by grinding the inner surface of the valve lifter 9, it is possible to control the thickness of the body 11 and the pressing wall 12, as well as the curvature of the continuous portion between the body 11 and the pressing wall PA12, to a high degree of opening. This also has the advantage of reducing variations in strength and lff1 from product to product.
なお、上述した実施例では、押圧壁部の下面にも研削加
工を施したが、この押圧壁部には必ずしも研削加工を龍
す必要はない。In addition, in the above-mentioned embodiment, the lower surface of the pressing wall portion was also subjected to the grinding process, but the pressing wall portion does not necessarily need to be subjected to the grinding process.
（発明の効果）
以上詳述した本発明によれば、バルブスプリングが削れ
たり共晶炭化物が脱落することは殆んどなくなり、この
削り粕や脱落した共晶炭化物によるステム部の摺動不良
ならびに異常摩耗を防止できる利点がある。(Effects of the Invention) According to the present invention described in detail above, it is almost impossible for the valve spring to be scraped or for the eutectic carbide to fall off, and the sliding failure of the stem portion due to the scrapings and the fallen eutectic carbide to be avoided. This has the advantage of preventing abnormal wear.
第１図ないし第３図は本発明の一実施例を示し、第１図
はバルブ回りの断面図、第２図はバルブリフタの断面図
、第３図はバルブリフタの断面部分の金属組織を４００
倍に拡大して示す顕微鏡写真、第４図は従来のバルブリ
フタの金３組織を４００倍に拡大して示す顕微鏡写真で
ある。
１・・・バルブ、２・・・ステム部、７．・・・動弁カ
ム、９・・・バルブリフタ、１１・・・胴部、１２・・
・押圧壁部、１１・・・平滑面。
出願人代理人 弁理士 鈴 江 武 彦瓜。 、ｈ′
第４図
江ニー
争
百
口；1 to 3 show an embodiment of the present invention. FIG. 1 is a cross-sectional view around the valve, FIG. 2 is a cross-sectional view of the valve lifter, and FIG. 3 shows the metal structure of the cross-sectional portion of the valve lifter.
FIG. 4 is a micrograph showing the gold 3 structure of a conventional valve lifter, enlarged 400 times. 1...Valve, 2...Stem part, 7. ... Valve train cam, 9... Valve lifter, 11... Body, 12...
- Pressing wall portion, 11...smooth surface. Applicant's agent: Patent attorney Takeshi Hiko Suzue. , h' Fig. 4 Ennie 100 mouths;
Claims (1)
れる押圧壁部を一体に設け、この胴部の内側にバルブの
ステム部を閉方向に付勢するバルブスプリングを挿通配
置したオーバヘッドカム形内燃機関のバルブリフタにお
いて、 上記バルブリフタは、共晶炭化物が分散して晶出された
鋼材にて構成し、その少なくとも胴部の内面を、面粗度
の小さな平滑面に仕上げたことを特徴とするオーバヘッ
ドカム形内燃機関のバルブリフタ。[Scope of Claims] A valve having a cylindrical body integrally provided with a pressing wall portion pressed by a valve driving cam at one end thereof, and urging a stem portion of the valve in a closing direction inside the body. In a valve lifter for an overhead cam type internal combustion engine in which a spring is inserted, the valve lifter is made of a steel material in which eutectic carbide is dispersed and crystallized, and at least the inner surface of the body is a smooth surface with small surface roughness. A valve lifter for an overhead cam type internal combustion engine, which is characterized by a finished finish.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24412486A JPS63100204A (en) | 1986-10-16 | 1986-10-16 | Valve lifter of overhead cam type internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24412486A JPS63100204A (en) | 1986-10-16 | 1986-10-16 | Valve lifter of overhead cam type internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63100204A true JPS63100204A (en) | 1988-05-02 |
Family
ID=17114117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24412486A Pending JPS63100204A (en) | 1986-10-16 | 1986-10-16 | Valve lifter of overhead cam type internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63100204A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5743224A (en) * | 1993-09-14 | 1998-04-28 | Unisia Jecs Corporation | Valve lifter surface and processing method thereof |
| FR2763637A1 (en) * | 1997-05-26 | 1998-11-27 | Schaeffler Waelzlager Ohg | ASSEMBLY OF MECHANICAL TAPPET VALVES OF INTERNAL COMBUSTION ENGINE |
-
1986
- 1986-10-16 JP JP24412486A patent/JPS63100204A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5743224A (en) * | 1993-09-14 | 1998-04-28 | Unisia Jecs Corporation | Valve lifter surface and processing method thereof |
| FR2763637A1 (en) * | 1997-05-26 | 1998-11-27 | Schaeffler Waelzlager Ohg | ASSEMBLY OF MECHANICAL TAPPET VALVES OF INTERNAL COMBUSTION ENGINE |
| US5904123A (en) * | 1997-05-26 | 1999-05-18 | Ina Walzlager Schaeffler Ohg | Mechanical valve tappet |
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