JPH07247811A - Direct driven type valve system in internal combustion engine - Google Patents
Direct driven type valve system in internal combustion engineInfo
- Publication number
- JPH07247811A JPH07247811A JP3840094A JP3840094A JPH07247811A JP H07247811 A JPH07247811 A JP H07247811A JP 3840094 A JP3840094 A JP 3840094A JP 3840094 A JP3840094 A JP 3840094A JP H07247811 A JPH07247811 A JP H07247811A
- Authority
- JP
- Japan
- Prior art keywords
- tip
- valve
- engine valve
- internal combustion
- engine
- 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
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、内燃機関における直動
型の動弁装置に係り、特に、タペットに装着したチップ
とエンジンバルブとの接触面の潤滑性を向上させた動弁
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct acting valve operating system for an internal combustion engine, and more particularly to a valve operating system having improved lubricity on a contact surface between a tip mounted on a tappet and an engine valve.
【0002】[0002]
【従来の技術】最近、DOHC式エンジン等に多用され
ている直動型の動弁装置におけるタペットを、動弁系の
軽量化を図る目的から、これまでの鉄製から軽合金製、
すなわちアルミニウム合金製とする傾向にある。アルミ
ニウム合金製のタペットは、鉄製のものに比して硬度が
低いため、エンジンバルブが当接する内底面に硬質金属
製のチップを装着して、その部分の耐摩耗性を高めてい
る。2. Description of the Related Art Recently, in order to reduce the weight of a valve train, a tappet in a direct drive valve train, which is widely used in a DOHC engine or the like, is made of iron or light alloy.
That is, it tends to be made of aluminum alloy. Since the aluminum alloy tappet has a lower hardness than the iron one, a hard metal tip is attached to the inner bottom surface against which the engine valve abuts to improve wear resistance of the portion.
【0003】このようなチップを備えるタペットを用い
た従来の動弁装置において、チップの下面、及びそれに
当接するエンジンバルブの軸端面は、精密仕上げ面とし
て非常になめらかに形成されているのが一般的である。In a conventional valve operating system using a tappet equipped with such a tip, the lower surface of the tip and the shaft end surface of the engine valve which is in contact with the tip are generally formed as very finely finished surfaces. Target.
【0004】[0004]
【発明が解決しようとする課題】直動型の動弁装置にお
いては、その構造上、チップとエンジンバルブとの互い
の接触面に供給される潤滑油の量は比較的少ない。従っ
て、接触面の摩耗を抑えるためには、供給された潤滑油
の保油性を高め、互いの接触面の潤滑性を向上させる必
要がある。In the direct-acting type valve operating device, the amount of lubricating oil supplied to the mutual contact surfaces of the tip and the engine valve is relatively small because of its structure. Therefore, in order to suppress the abrasion of the contact surfaces, it is necessary to enhance the oil retaining property of the supplied lubricating oil and improve the lubricity of the mutual contact surfaces.
【0005】しかしながら、上記した従来の動弁装置の
ように、チップの下面及びエンジンバルブの軸端面がな
めらかに仕上げられていると、潤滑油の保油性が極めて
低くなり、その結果、チップとエンジンバルブとの接触
面の潤滑性が低下して、チップ及びエンジンバルブの接
触面の摩耗を早める。However, when the lower surface of the tip and the shaft end surface of the engine valve are smoothly finished as in the above-described conventional valve operating device, the oil retaining property of the lubricating oil becomes extremely low, and as a result, the tip and the engine are reduced. The lubricity of the contact surface with the valve is reduced, and the wear of the contact surface of the tip and the engine valve is accelerated.
【0006】本発明は、上記問題点を解決するためにな
されたもので、チップとエンジンバルブとの互いの接触
面の保油性を高めることにより、それら接触面の摩耗量
を最小限に抑えうるようにした内燃機関における直動型
動弁装置を提供することを目的としている。The present invention has been made to solve the above-mentioned problems, and the amount of wear on the contact surfaces of the tip and the engine valve can be minimized by enhancing the oil retaining property of the contact surfaces. An object of the present invention is to provide a direct-acting valve operating system for such an internal combustion engine.
【0007】[0007]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、回転カムとエンジンバルブとの間に設け
られた円筒形をなすタペットの閉塞壁の内底面に、硬質
のチップを装着し、このチップを介してエンジンバルブ
の軸端面を押動するようにした内燃機関における直動型
動弁装置において、前記チップとエンジンバルブの軸端
面との互いの接触面の少なくともいずれか一方に、無方
向性の研摩跡を形成したことを特徴とするものである
(請求項1)。To achieve the above object, the present invention mounts a hard tip on the inner bottom surface of a closed wall of a cylindrical tappet provided between a rotary cam and an engine valve. However, in the direct-acting type valve operating device for the internal combustion engine that pushes the shaft end face of the engine valve through this tip, at least one of the mutual contact surfaces of the tip and the shaft end face of the engine valve , Characterized by forming non-directional polishing marks
(Claim 1).
【0008】上記チップの無方向性の研摩跡は、バレル
研摩により形成するのが望ましい(請求項2)。The non-directional polishing mark of the chip is preferably formed by barrel polishing (claim 2).
【0009】[0009]
【作用】チップとエンジンバルブの軸端面との互いの接
触面の少なくともいずれか一方に、無方向性の研摩跡を
形成したことにより、チップ又はエンジンバルブの軸端
面に付着した潤滑油が研摩跡に浸透し、保油性が高まっ
て互いの接触面の潤滑性が向上する。By forming a non-directional grinding mark on at least one of the contact surfaces of the tip and the shaft end surface of the engine valve, the lubricating oil adhered to the tip or the shaft end surface of the engine valve is ground. Permeate into the oil to improve the oil retaining property and improve the lubricity of the mutual contact surfaces.
【0010】[0010]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。図1は、本発明に係る直動型の動弁装置を略示す
るもので、(1)は、上面閉塞されたアルミニウム合金製
の円筒形のタペット、(2)は、タペット(1)の上面の円
形凹所(3)内に嵌挿された、弁隙間調整用の耐摩耗性金
属材料製のシムである。シム(2)の上面には回転カム
(4)が接触している。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a direct-acting valve operating device according to the present invention. (1) is a cylindrical tappet made of an aluminum alloy with an upper surface closed, and (2) is a tappet (1). A shim made of a wear-resistant metal material for adjusting the valve clearance, which is inserted into the circular recess (3) on the upper surface. Rotating cam on top of shim (2)
(4) is in contact.
【0011】タペット(1)の上壁(閉塞壁)(1a)の内底面
中央に形成された小径の有底孔(5)内には、上記シム
(2)と同様、耐摩耗性金属材料よりなる硬質のチップ
(6)が嵌合され、有底孔(5)の下端周縁をかしめ(7)を
もって締付けることにより固定されている。In the small-diameter bottomed hole (5) formed in the center of the inner bottom surface of the upper wall (closed wall) (1a) of the tappet (1), the shim is formed.
Similar to (2), hard tip made of wear resistant metal material
(6) is fitted, and is fixed by caulking the lower end peripheral edge of the bottomed hole (5) with caulking (7).
【0012】タペット(1)内には、エンジンバルブ(8)
の上端部が収容され、その軸端はチップ(6)と当接して
いる。エンジンバルブ(8)の上端部外周面には、1対の
コッタ(9)を介してスプリングリテーナ(10)が止着さ
れ、エンジンバルブ(8)は、スプリングリテーナ(10)と
シリンダヘッド(図示省略)との間に縮設したバルブスプ
リング(11)により、常時上向に付勢されている。Inside the tappet (1) is an engine valve (8).
The upper end of the is accommodated, and its shaft end is in contact with the tip (6). A spring retainer (10) is fixed to the outer peripheral surface of the upper end of the engine valve (8) via a pair of cotters (9), and the engine valve (8) includes a spring retainer (10) and a cylinder head (shown in the figure). A valve spring (11) is installed between the valve spring (11) and the valve spring (11) so that it is always urged upward.
【0013】チップ(6)の下面(6a)には、図2に上下倒
立して示すように、表面あらさ(Rz)が1〜50μm程度
の無方向性の研摩跡(12)が形成されている。On the lower surface (6a) of the tip (6), as shown upside down in FIG. 2, a non-directional polishing mark (12) having a surface roughness (Rz) of about 1 to 50 μm is formed. There is.
【0014】この研摩跡(12)の形成手段は、砥石車によ
る研摩、ショットブラスト、バレル研摩等があるが、こ
の中でもバレル研摩が最も好ましく、この方法による
と、研摩材(砥粒)との間の摩擦作用と転摩作用により、
無方向性の研摩跡(12)が容易に形成されるだけでなく、
研摩材とチップ(6)との衝突により、チップ(6)の表面
が加工硬化を起こすので、チップ(6)自身が硬質となっ
て耐摩耗性に有利となる。The means for forming the polishing traces (12) include grinding with a grinding wheel, shot blasting, barrel polishing and the like. Of these, barrel polishing is the most preferable, and according to this method, the polishing material (abrasive grains) Due to the friction and rolling action between
Not only are non-directional polishing marks (12) easily formed,
The collision between the abrasive material and the tip (6) causes work hardening of the surface of the tip (6), so that the tip (6) itself becomes hard, which is advantageous for wear resistance.
【0015】チップ(6)の下面(6a)に無方向性の研摩跡
(12)を形成すると、チップ(6)の下面に潤滑油が付着し
た際、それが研摩跡(12)の目の中に浸透して保油性を高
める。その結果、チップ(6)とエンジンバルブ(8)との
互いの接触面の潤滑性が良好となり、その部分の摩耗量
を著しく少なくすることができる。Non-directional polishing marks on the lower surface (6a) of the tip (6)
When the (12) is formed, when the lubricating oil adheres to the lower surface of the tip (6), it penetrates into the eyes of the polishing mark (12) to enhance oil retention. As a result, the contact surface between the tip (6) and the engine valve (8) has good lubricity, and the amount of wear at that portion can be significantly reduced.
【0016】上記実施例では、チップ(6)側に無方向性
の研摩跡(12)を形成した例を示しているが、図3に示す
ように、エンジンバルブ(8)の軸端面側に無方向性の研
摩跡(13)を形成してもよく、この場合においても上述し
たと同様の作用効果を奏する。The above embodiment shows an example in which the non-directional polishing mark (12) is formed on the tip (6) side, but as shown in FIG. 3, it is formed on the shaft end face side of the engine valve (8). Non-directional polishing marks (13) may be formed, and in this case also, the same effect as described above can be obtained.
【0017】エンジンバルブ(8)に無方向性の研摩跡(1
3)を形成する要領としては、例えば図4に示す方法が望
ましい。すなわち、エンジンバルブ(8)をチャック(図
示略)により把持して回転させるとともに、ワークの前
方において砥石車(14)の環状をなす砥石(15)を、ワーク
の軸線と直交する方向へ、回転させながら往復移動させ
て軸端面を研削する。すると、ワーク及び砥石(15)の回
転と砥石車(14)の移動との相乗作用により、図3に示す
ような研摩跡(13)が形成される。Non-directional polishing marks (1) on the engine valve (8)
As a method of forming 3), for example, the method shown in FIG. 4 is desirable. That is, the engine valve (8) is gripped and rotated by a chuck (not shown), and the ring-shaped grindstone (15) of the grinding wheel (14) is rotated in the direction orthogonal to the axis of the work in front of the work. The shaft end surface is ground by reciprocating while moving. Then, the polishing mark (13) as shown in FIG. 3 is formed by the synergistic action of the rotation of the work and the grindstone (15) and the movement of the grinding wheel (14).
【0018】この際、エンジンバルブ(8)や砥石車(14)
の回転数を適宜に変化させたり、砥石車(14)の移動速度
を変化させると、無方向性かつ不規則な研摩跡(13)が顕
著に表われる。At this time, the engine valve (8) and the grinding wheel (14)
When the number of rotations of the grinding wheel is appropriately changed or the moving speed of the grinding wheel (14) is changed, non-directional and irregular polishing marks (13) are prominently displayed.
【0019】なお、上記実施例では、チップ(6)及びエ
ンジンバルブ(8)の軸端面のいずれか一方に研摩跡(12)
(13)を形成した例を示しているが、それらの双方の面に
研摩跡(12)(13)を形成することもある。In the above embodiment, the polishing mark (12) is formed on either one of the tip (6) and the shaft end surface of the engine valve (8).
Although the example in which (13) is formed is shown, polishing marks (12) and (13) may be formed on both surfaces of them.
【0020】[0020]
【発明の効果】本発明によれば、チップとエンジンバル
ブ軸端面との互いの接触面の保油性が高まって潤滑性が
向上するので、互いの接触面の摩耗量は最小限となり優
れた耐摩耗性を有するようになる(請求項1)。According to the present invention, since the oil retaining property of the contact surface between the tip and the engine valve shaft end surface is improved and the lubricity is improved, the wear amount of the mutual contact surface is minimized and excellent resistance is achieved. It has abrasion resistance (claim 1).
【0021】請求項2記載の発明によれば、無方向性の
研摩跡を極めて容易に形成しうるとともに、加工硬化を
起こしてチップ自身が硬質となるので、耐摩耗性がさら
に向上する。According to the second aspect of the present invention, non-directional polishing marks can be formed extremely easily, and work hardening causes the chips themselves to become hard, so that the wear resistance is further improved.
【図1】本発明の一実施例を示す中央縦断正面図であ
る。FIG. 1 is a central longitudinal front view showing an embodiment of the present invention.
【図2】同じくチップを倒立して示す斜視図である。FIG. 2 is a perspective view showing the chip upside down.
【図3】同じくエンジンバルブの軸端部の斜視図であ
る。FIG. 3 is a perspective view of the shaft end portion of the engine valve.
【図4】エンジンバルブ軸端面への研摩跡の形成要領を
示す説明図である。FIG. 4 is an explanatory view showing a way of forming a polishing mark on an end surface of an engine valve shaft.
(1)タペット (1a)上壁(閉塞壁) (2)シム (3)円形凹所 (4)回転カム (5)有底孔 (6)チップ (6a)下面 (7)かしめ (8)エンジンバルブ (9)コッタ (10)スプリングリテーナ (11)バルブスプリング (12)(13)研摩跡 (14)砥石車 (15)砥石 (1) Tappet (1a) Upper wall (closed wall) (2) Shim (3) Circular recess (4) Rotating cam (5) Bottom hole (6) Tip (6a) Lower surface (7) Caulking (8) Engine Valve (9) Cotter (10) Spring retainer (11) Valve spring (12) (13) Abrasive mark (14) Grinding wheel (15) Grinding wheel
Claims (2)
られた円筒形をなすタペットの閉塞壁の内底面に、硬質
のチップを装着し、このチップを介してエンジンバルブ
の軸端面を押動するようにした内燃機関における直動型
動弁装置において、前記チップとエンジンバルブの軸端
面との互いの接触面の少なくともいずれか一方に、無方
向性の研摩跡を形成したことを特徴とする内燃機関にお
ける直動型動弁装置。1. A hard tip is attached to an inner bottom surface of a closed wall of a cylindrical tappet provided between a rotary cam and an engine valve, and a shaft end surface of the engine valve is pushed through the tip. In the direct acting type valve operating device for the internal combustion engine, the non-directional polishing mark is formed on at least one of the contact surfaces of the tip and the shaft end surface of the engine valve. A direct-acting valve operating system for an internal combustion engine.
により形成したことを特徴とする請求項1記載の内燃機
関における直動型動弁装置。2. A direct-acting valve operating system for an internal combustion engine according to claim 1, wherein the non-directional polishing mark of the tip is formed by barrel polishing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3840094A JPH07247811A (en) | 1994-03-09 | 1994-03-09 | Direct driven type valve system in internal combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3840094A JPH07247811A (en) | 1994-03-09 | 1994-03-09 | Direct driven type valve system in internal combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH07247811A true JPH07247811A (en) | 1995-09-26 |
Family
ID=12524252
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3840094A Pending JPH07247811A (en) | 1994-03-09 | 1994-03-09 | Direct driven type valve system in internal combustion engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07247811A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20120062304A (en) * | 2010-12-06 | 2012-06-14 | 두산인프라코어 주식회사 | Valve for engine |
-
1994
- 1994-03-09 JP JP3840094A patent/JPH07247811A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20120062304A (en) * | 2010-12-06 | 2012-06-14 | 두산인프라코어 주식회사 | Valve for engine |
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