JPH05263932A - Piston of two-cycle engine - Google Patents
Piston of two-cycle engineInfo
- Publication number
- JPH05263932A JPH05263932A JP8942392A JP8942392A JPH05263932A JP H05263932 A JPH05263932 A JP H05263932A JP 8942392 A JP8942392 A JP 8942392A JP 8942392 A JP8942392 A JP 8942392A JP H05263932 A JPH05263932 A JP H05263932A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- silicon nitride
- porous silicon
- cycle engine
- aluminum
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
(57)【要約】
【目的】高負荷運転にてもピストンの焼付が防止でき、
耐久性の優れた２サイクルエンジンのピストン構造を提
供する。
【構成】多孔質窒化珪素からなるシリンダライナの内面
にはポリシラザンを付着させて滑面となし、ピストン１
の胴部１２の外壁に多孔質窒化珪素の層１４を形成させ
てその内側にアルミニウムを含浸させる。またピストン
リング溝１５の部分は多孔質窒化珪素とアルミニウムで
メタルセラミックスコンポジットを構成させて耐摩耗性
を向上させて高負荷時における焼付を防止する。
(57) [Summary] [Purpose] Prevents piston seizure even under high load operation.
(EN) Provided is a piston structure of a two-cycle engine having excellent durability. [Constitution] Polysilazane is adhered to the inner surface of a cylinder liner made of porous silicon nitride to form a smooth surface.
A layer 14 of porous silicon nitride is formed on the outer wall of the body 12 and the inside thereof is impregnated with aluminum. The piston ring groove 15 is made of porous silicon nitride and aluminum to form a metal ceramic composite to improve wear resistance and prevent seizure under high load.
Description
【０００１】[0001]
【産業上の利用分野】本発明は高負荷を要する２サイク
ルエンジンのピストン構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston structure for a two-cycle engine which requires a high load.
【０００２】[0002]
【従来の技術】燃料の燃焼を機関の内部で行い、発生す
る熱エネルギーによりピストンを往復させて駆動するエ
ンジンでは、ピストンの２行程、すなわちクランク軸１
回転にて吸入、圧縮、爆発、排気の過程を行う２サイク
ルエンジンと、ピストンの４行程、すなわちクランク軸
２回転の間に前記の４過程を行う４サイクルエンジンと
に大別されている。2. Description of the Related Art In an engine in which fuel is combusted inside an engine and a piston is reciprocated by thermal energy generated to drive the piston, two strokes of the piston, that is, a crankshaft 1
It is roughly classified into a two-cycle engine that performs intake, compression, explosion, and exhaust processes by rotation, and a four-cycle engine that performs the above-mentioned four processes during four strokes of the piston, that is, two revolutions of the crankshaft.
【０００３】そして、２サイクルエンジンではクランク
軸の１回転毎に爆発が行われるため、出力軸の回転変動
が少なく高トルクが発生できるという利点がある。In a two-cycle engine, an explosion occurs every one revolution of the crankshaft, so that there is an advantage that the rotational fluctuation of the output shaft is small and high torque can be generated.
【０００４】[0004]
【発明が解決しようとする課題】一方、このような２サ
イクルエンジンでは、小さな容量で負荷を大にして大出
力を得ようとすると、発熱のためピストンリングの部分
の潤滑不良が高じてシリンダとの焼付が生ずるという問
題がある。On the other hand, in such a two-cycle engine, when an attempt is made to obtain a large output by increasing the load with a small capacity, heat generation causes heat failure due to poor lubrication of the piston ring portion and the cylinder. However, there is a problem that image sticking occurs.
【０００５】本発明はこのような問題に鑑みてなされた
ものであり、その目的は高負荷運転に耐えてピストンの
焼付が発生し難い２サイクルエンジンのピストン構造を
提供しようとするものである。The present invention has been made in view of the above problems, and an object thereof is to provide a piston structure for a two-cycle engine that can withstand high load operation and is unlikely to cause piston seizure.
【０００６】[0006]
【課題を解決するための手段】上述の目的を達成するた
めに本発明によれば、ピストンの胴部の外周部に多孔質
の窒化珪素を配置しその内側にアルミニウムを含浸させ
るとともに、多孔質の窒化珪素からなるピストンリング
溝部にアルミニウムを含浸させたピストンと、多孔質の
窒化珪素を用いたシリンダライナの内壁面にポリシラザ
ンを付着させてピストンとの摺動面を滑面に形成したシ
リンダとを備えた２サイクルエンジンのピストン構造が
提供される。In order to achieve the above object, according to the present invention, porous silicon nitride is arranged on the outer peripheral portion of the body of the piston, and the inside thereof is impregnated with aluminum. A piston in which the piston ring groove made of silicon nitride is impregnated with aluminum, and a cylinder in which polysilazane is adhered to the inner wall surface of a cylinder liner made of porous silicon nitride to form a sliding surface with the piston on a smooth surface. A piston structure for a two-cycle engine is provided.
【０００７】[0007]
【作用】多孔質窒化珪素のシリンダライナの内壁面にポ
リシラザンを付着させて滑面に形成し、ピストンの胴部
の外壁面に配置した多孔質窒化珪素の内側にはアルミニ
ウムを含浸させるとともにピストンリング溝の部分は多
孔質窒化珪素とアルミニウムにてメタルセラミックスコ
ンポジットを構成させるので、ピストンの往復運動に際
して平滑なシリンダライナと多孔質窒化珪素との組合せ
により摩擦係数が小になり、さらにピストンリング溝部
の耐摩耗性の向上により高負荷運転でも焼付が防止され
る。[Function] Polysilazane is adhered to the inner wall surface of the porous silicon nitride cylinder liner to form a smooth surface, and the inside of the porous silicon nitride arranged on the outer wall surface of the piston body is impregnated with aluminum and the piston ring. Since the groove portion is made of porous silicon nitride and aluminum to form a metal-ceramic composite, the friction coefficient becomes small due to the combination of the smooth cylinder liner and the porous silicon nitride during the reciprocating movement of the piston. The improved wear resistance prevents seizure even under high load operation.
【０００８】[0008]
【実施例】つぎに本発明の実施例について図面を用いて
詳細に説明する。Embodiments of the present invention will now be described in detail with reference to the drawings.
【０００９】図１は本発明にかかる２サイクルエンジン
のピストン構造の一実施例を示す断面図であり、同図に
おいて１はピストンであり、２はそのシリンダライナで
ある。FIG. 1 is a sectional view showing an embodiment of a piston structure of a two-cycle engine according to the present invention. In the drawing, 1 is a piston and 2 is a cylinder liner thereof.
【００１０】ピストン１の頭部１１は高熱に耐えるとと
もに高強度の窒化珪素（Ｓｉ3 Ｏ4）が用いられて、胴
部１２とは金属性のリング１３により連結されている。
そして、胴部１２の外周壁には反応焼結により作成され
た多孔質の窒化珪素の層１４が配置され、その内側には
アルミニウム（Ａｌ）が含浸されている。また、ピスト
ンリング溝１５の部分にも多孔質の窒化珪素が使用され
アルミニウムが含浸されて、高強度のメタルセラミック
スコンポジットが構成されており、優れた耐摩耗性を有
している。The head portion 11 of the piston 1 is made of high-strength silicon nitride (Si 3 O 4 ) and can withstand high heat, and is connected to the body portion 12 by a metallic ring 13.
Then, a porous silicon nitride layer 14 formed by reaction sintering is arranged on the outer peripheral wall of the body portion 12, and aluminum (Al) is impregnated inside thereof. Further, porous silicon nitride is also used in the portion of the piston ring groove 15 and impregnated with aluminum to form a high-strength metal-ceramic composite, which has excellent wear resistance.
【００１１】シリンダライナ２も反応焼結にて作成され
た多孔質の窒化珪素からなるもので、その内壁面には例
えばポリシラザン（例えばＨ2 ＳｉＮＣＨ3 ，［ＣＨ3
ＳｉＨＮＨ］ｎ）を付着させて滑面が形成され、表面密
度の向上が図られている。The cylinder liner 2 is also made of porous silicon nitride produced by reaction sintering, and has polysilazane (for example, H 2 SiNCH 3 , [CH 3] on its inner wall surface.
SiHNH] n) is attached to form a smooth surface to improve the surface density.
【００１２】このように構成された本実施例において
は、ピストン１の胴部１２の外周壁は多孔質の窒化珪素
が配置されてアルミニウムが含浸されており、また多孔
質の窒化珪素からなるシリンダライナ２の内壁面はポリ
シラザンにより密度が向上されて平滑に仕上げられてい
るので、滑面と多孔質の窒化珪素との組合せにより摩擦
係数が小になって円滑に摺動することになり、さらにピ
ストンリング溝１５の部分は高強度のメタルセラミック
スコンポジットとなっって耐摩耗性が優れているため、
シリンダライナ２との焼付の発生が防止されることにな
る。In this embodiment thus constructed, the outer peripheral wall of the body portion 12 of the piston 1 is provided with porous silicon nitride and impregnated with aluminum, and a cylinder made of porous silicon nitride. Since the inner wall surface of the liner 2 has a density improved by polysilazane and is finished to be smooth, the combination of the smooth surface and porous silicon nitride reduces the coefficient of friction to allow smooth sliding. The portion of the piston ring groove 15 is made of high strength metal-ceramic composite and has excellent wear resistance.
The occurrence of seizure with the cylinder liner 2 is prevented.
【００１３】以上、本発明を上述の実施例によって説明
したが、本発明の主旨の範囲内で種々の変形が可能であ
り、これらの変形を本発明の範囲から排除するものでは
ない。Although the present invention has been described with reference to the above embodiments, various modifications are possible within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.
【００１４】[0014]
【発明の効果】上述の実施例のように本発明によれば、
ピストンの胴部の外周部とシリンダライナとの反応焼結
による多孔質の窒化珪素を用い、ピストンリング溝の部
分にはアルミニウムを含浸させて耐摩耗性を向上させる
とともに、シリンダライナの内壁にはポリシラザンを付
着させて滑面化を図ったので、平滑なシリンダライナと
多孔質窒化珪素との組合せで摩擦係数が小さいため、エ
ンジン負荷を増して熱的に苛酷な運転を行っても焼付が
発生することなく、耐久性の優れた２サイクルエンジン
が得られる。According to the present invention as in the above embodiments,
Porous silicon nitride produced by reaction sintering between the outer circumference of the piston body and the cylinder liner is used.The piston ring groove is impregnated with aluminum to improve wear resistance, and the inner wall of the cylinder liner is Since polysilazane is adhered to achieve a smooth surface, the combination of a smooth cylinder liner and porous silicon nitride has a small friction coefficient, so seizure occurs even when the engine load is increased and the operation is thermally harsh. Without doing so, a two-cycle engine with excellent durability can be obtained.
【図１】本発明にかかる２サイクルエンジンのピストン
構造の一実施例を示す断面図である。FIG. 1 is a cross-sectional view showing an embodiment of a piston structure of a two-cycle engine according to the present invention.
１…ピストン ２…シリンダライナ １５…ピストンリング溝 1 ... Piston 2 ... Cylinder liner 15 ... Piston ring groove
Claims (2)
素を配置しその内側にアルミニウムを含浸させるととも
に、多孔質の窒化珪素からなるピストンリング溝部にア
ルミニウムを含浸させたピストンと、多孔質の窒化珪素
を用いたシリンダライナの内壁面にポリシラザンを付着
させてピストンとの摺動面を滑面に形成したシリンダと
を備えたことを特徴とする２サイクルエンジンのピスト
ン構造。1. A piston in which porous silicon nitride is arranged on the outer periphery of the body of a piston and aluminum is impregnated inside the piston, and a piston ring groove made of porous silicon nitride is impregnated with aluminum; A piston structure for a two-cycle engine, comprising: a cylinder in which polysilazane is adhered to an inner wall surface of a cylinder liner made of high-quality silicon nitride to form a sliding surface for sliding with a piston on a smooth surface.
て珪素からなる成型品を反応焼結せしめたものであるこ
とを特徴とする請求項１記載の２サイクルエンジンのピ
ストン構造。2. The piston structure for a two-cycle engine according to claim 1, wherein the porous silicon nitride is a molded product made of silicon that is subjected to reaction sintering in a nitrogen atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8942392A JPH05263932A (en) | 1992-03-13 | 1992-03-13 | Piston of two-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8942392A JPH05263932A (en) | 1992-03-13 | 1992-03-13 | Piston of two-cycle engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05263932A true JPH05263932A (en) | 1993-10-12 |
Family
ID=13970253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8942392A Pending JPH05263932A (en) | 1992-03-13 | 1992-03-13 | Piston of two-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05263932A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6877476B1 (en) * | 2003-10-09 | 2005-04-12 | Indexica, Ltd. | Internal combustion engine |
-
1992
- 1992-03-13 JP JP8942392A patent/JPH05263932A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6877476B1 (en) * | 2003-10-09 | 2005-04-12 | Indexica, Ltd. | Internal combustion engine |
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