JPS6023487Y2 - engine piston - Google Patents
engine pistonInfo
- Publication number
- JPS6023487Y2 JPS6023487Y2 JP8236679U JP8236679U JPS6023487Y2 JP S6023487 Y2 JPS6023487 Y2 JP S6023487Y2 JP 8236679 U JP8236679 U JP 8236679U JP 8236679 U JP8236679 U JP 8236679U JP S6023487 Y2 JPS6023487 Y2 JP S6023487Y2
- Authority
- JP
- Japan
- Prior art keywords
- piston
- engine piston
- ring groove
- skirt portion
- skirt
- 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
Links
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
Description
【考案の詳細な説明】
本考案は、レシプロエンジンのピストンの構造上の改良
に関するものである。[Detailed Description of the Invention] The present invention relates to a structural improvement of a piston for a reciprocating engine.
一般に、圧縮リング溝およびオイルリング溝を有するヘ
ッド部と、上記ヘッド部に連続し、シリンダ内周面に摺
接する下方に伸びたスカート部とを備えたエンジンのピ
ストン構造はよく知られている。In general, an engine piston structure is well known that includes a head portion having a compression ring groove and an oil ring groove, and a skirt portion that extends downward and is continuous with the head portion and comes into sliding contact with the inner circumferential surface of the cylinder.
ところで、この種のピストンにおいては、ピストンの摺
動面の摺動面積を減少とともに、運転中のピストンの膨
張を吸収するため、例えば特開昭５１−５６４０８号公
報にも開示のようにスカート部の表面側即ち摺動面に複
数の円周方向の溝を設け、摺動抵抗の減少を図る構造が
提案されている。By the way, in this type of piston, in order to reduce the sliding area of the piston's sliding surface and absorb the expansion of the piston during operation, a skirt portion is used, for example, as disclosed in JP-A-51-56408. A structure has been proposed in which a plurality of circumferential grooves are provided on the surface side, that is, the sliding surface, to reduce sliding resistance.
しかしながら、上記の如き構造を備えたピストンは、エ
ンジンを高速、高負荷或いは長時間サイクリック運転を
行なうと、スカート部の溝のエッヂによって油切れが生
じスカート部の溝の周辺にスカッフィングが起り、或い
は異常摩耗をきたす問題がある。However, when a piston with the above structure is operated at high speed, under high load, or in cyclic operation for a long period of time, the edges of the grooves in the skirt part run out of oil and scuffing occurs around the grooves in the skirt part. Alternatively, there is a problem of abnormal wear.
本考案は、かかる問題に鑑みてなされたものであって、
ピストンのスカート部のスラスト・反スラスト側の内面
側に、円周方向の溝を複数設け、ピストンの熱膨張によ
って起る形状変形を改善することにより、ピストンの摺
動抵抗を軽減するようにしたことを特徴とするエンジン
のピストンを提供することを目的としている。The present invention was made in view of such problems, and
Multiple circumferential grooves are provided on the inner surface of the thrust/anti-thrust side of the piston skirt to reduce the piston's sliding resistance by improving the shape deformation caused by thermal expansion of the piston. The purpose of the present invention is to provide an engine piston characterized by the following.
以下、本考案を第１図、第２図により具体的に説明する
と、１は２条の圧縮リング溝２，２、オイルリング溝３
を外周部に設けたヘッド部４と、ヘッド部４から下方に
伸びたスカート部５と、スカート部５に設けたボス部６
とからなるピストン、７はその内部をピストン１が上下
方向に摺動するシリンダである。Hereinafter, the present invention will be explained in detail with reference to FIGS. 1 and 2. 1 indicates two compression ring grooves 2, 2, and an oil ring groove 3.
A head portion 4 provided on the outer periphery, a skirt portion 5 extending downward from the head portion 4, and a boss portion 6 provided on the skirt portion 5.
A piston 7 is a cylinder in which the piston 1 slides in the vertical direction.
上記スカート部５は、その外周を平滑なだ円面とし、下
方に向うにしたがって僅かにテーパ状に拡がった形状と
腰そのスラスト・反スラストの内面側には、図示の如く
、計４段の円周方向の溝８、・・・、８を適当な間隔を
おいて設ける。The skirt portion 5 has a smooth elliptical outer periphery, a shape that slightly tapers downward, and a total of four steps on the thrust and anti-thrust inner surfaces of the waist. Circumferential grooves 8, . . . , 8 are provided at appropriate intervals.
上記円周方向の溝８．・・・、８は、切削によってもし
くは鋳造に際して形威し、その断面形状は、矩形又はＶ
型とすることが好ましい。Said circumferential groove 8. ..., 8 is shaped by cutting or casting, and its cross-sectional shape is rectangular or V-shaped.
It is preferable to use a mold.
また、上記溝８．・・・、８の数、寸法諸元は、実際に
は、ピストン１の寸法諸元との関係で、スヵ−ト部５の
剛性をある程度低下させ、ピストン１の熱膨張に伴う摺
動抵抗の増大を有効に防止しうるように設定する。In addition, the groove 8. ..., the number 8 and the dimensional specifications actually reduce the rigidity of the skirt portion 5 to some extent in relation to the dimensional specifications of the piston 1, and reduce the sliding caused by the thermal expansion of the piston 1. Set so that an increase in resistance can be effectively prevented.
即ち、運転中に起るピストン１の熱膨張量は、通常径方
向にして３０〜７０μであり、ピストン１のスカート部
５の剛性を上記各溝８、・・・、８によって下げること
により、熱膨張によるライナーとの摺動抵抗の増大の絶
対値を下げ、シリンダ７の内周面とのクリアランスを確
保するとともに、潤滑油を確保腰ピストン１の摺動抵抗
を軽減させるようにしたのである。That is, the amount of thermal expansion of the piston 1 that occurs during operation is usually 30 to 70 μ in the radial direction, and by lowering the rigidity of the skirt portion 5 of the piston 1 by the above-mentioned grooves 8, . This reduces the absolute value of the increase in sliding resistance with the liner due to thermal expansion, secures clearance with the inner peripheral surface of the cylinder 7, secures lubricating oil, and reduces the sliding resistance of the waist piston 1. .
したがって、本考案に係るピストン構造では、高速、高
負荷あるいは長時間サイクリック運転等においてもスカ
ッフィングや異常摩耗をピストン摺動面に生ずることが
ないので、シリンダおよびピストンの摺動面を長期に亘
って良好に維持することができる。Therefore, the piston structure according to the present invention does not cause scuffing or abnormal wear on the piston sliding surfaces even during high-speed, high-load or long-term cyclic operation, so the sliding surfaces of the cylinder and piston can be maintained for a long period of time. and can be maintained in good condition.
第１図は本考案に係るエンジンのピストン構造を示す軸
方向断面図、第２図は第１図の■−■線方向断面図であ
る。
１・・・・・ゼストン、２，２・・・・・・圧縮リング
溝、３・・・・・・オイルリング溝、４・・・・・・ヘ
ッド部、５・・・・・・スカート部、８．・・・、８・
・・・・・溝。FIG. 1 is an axial cross-sectional view showing the piston structure of an engine according to the present invention, and FIG. 2 is a cross-sectional view taken along the line ■--■ in FIG. 1...Zeston, 2, 2...Compression ring groove, 3...Oil ring groove, 4...Head part, 5...Skirt Section, 8. ..., 8.
·····groove.
Claims (1)
、上記ヘッド部に連続し、シリンダ内周面に摺接するス
カート部とを備えたエンジンのピストンにおいて、 スカート部のスラスト・反スラスト側の内面側に、円周
方向に伸びる複数の溝を設けたことを特徴とするエンジ
ンのピストン。[Scope of Claim for Utility Model Registration] In an engine piston comprising a head portion having a compression ring groove and an oil ring groove, and a skirt portion continuous with the head portion and slidingly contacting the inner peripheral surface of the cylinder, the thrust of the skirt portion -An engine piston characterized by having multiple grooves extending in the circumferential direction on the inner surface of the anti-thrust side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8236679U JPS6023487Y2 (en) | 1979-06-16 | 1979-06-16 | engine piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8236679U JPS6023487Y2 (en) | 1979-06-16 | 1979-06-16 | engine piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS562042U JPS562042U (en) | 1981-01-09 |
| JPS6023487Y2 true JPS6023487Y2 (en) | 1985-07-12 |
Family
ID=29315597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8236679U Expired JPS6023487Y2 (en) | 1979-06-16 | 1979-06-16 | engine piston |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6023487Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62194218U (en) * | 1986-01-25 | 1987-12-10 | ||
| JPS6374532U (en) * | 1986-11-05 | 1988-05-18 | ||
| JPS63120921A (en) * | 1986-11-11 | 1988-05-25 | Shinko Electric Co Ltd | Automatic gap adjustment device in electromagnetic clutch/brake |
-
1979
- 1979-06-16 JP JP8236679U patent/JPS6023487Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS562042U (en) | 1981-01-09 |
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