JPS62129550A - Piston - Google Patents

Piston

Info

Publication number
JPS62129550A
JPS62129550A JP26798585A JP26798585A JPS62129550A JP S62129550 A JPS62129550 A JP S62129550A JP 26798585 A JP26798585 A JP 26798585A JP 26798585 A JP26798585 A JP 26798585A JP S62129550 A JPS62129550 A JP S62129550A
Authority
JP
Japan
Prior art keywords
piston
thermal expansion
groove
ring
coefficient
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
JP26798585A
Other languages
Japanese (ja)
Inventor
Yasuhiro Kawabata
川端　康浩
Naoki Minamoto
直樹 皆本
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.)
Aisin Corp
Original Assignee
Aisin Seiki 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 Aisin Seiki Co Ltd filed Critical Aisin Seiki Co Ltd
Priority to JP26798585A priority Critical patent/JPS62129550A/en
Publication of JPS62129550A publication Critical patent/JPS62129550A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/02—Pistons  having means for accommodating or controlling heat expansion
    • F02F3/04—Pistons  having means for accommodating or controlling heat expansion having expansion-controlling inserts
    • F02F3/08—Pistons  having means for accommodating or controlling heat expansion having expansion-controlling inserts the inserts being ring-shaped
    • 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
    • F05C2251/00—Material properties
    • F05C2251/04—Thermal properties
    • F05C2251/042—Expansivity

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

PURPOSE:To prevent the occurrence of thermal expansion around a top peripheral part as well as to reduce a rate of consumption in lubricating oil, by locking a ring, formed with a material being smaller in a coefficient of thermal expansion than that of a piston, to a peripheral part of the top of the said piston. CONSTITUTION:A piston body being used for an internal combustion engine consists of a top part 1, a skirt part 2, a pin boss part 3 having a hole piercing through in the diametral direction, a first groove 4a, a second groove 4b and an oil groove 4c. In this case, a ring 5 formed with a material being small in a coefficient of thermal expansion and excellent in heat resistance, for example, cast iron is made so as to be cast in a peripheral part of a piston top part. With this constitution, expansion to the outside of the piston top part is reduced, reducing a degree of friction with a cylinder inner surface, thus a rate of consumption in lubricating oil is retrenched.

Description

【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明は、内燃機関に使用されるピストンに関するもの
であり、詳しくはピストン頂部外周部の熱膨張を小さく
するものである。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a piston used in an internal combustion engine, and more specifically, to a piston that reduces the thermal expansion of the outer circumference of the top of the piston. .

（従来の技術） 本発明に係る従来技術としては実開昭５６−４１１３９
号公報で開示されたもの等がある。(Prior art) As a prior art related to the present invention, Utility Model Application Publication No. 56-41139
There are some that were disclosed in the No.

頂部、スカート部、ビスンボス部から構成されたピスト
ンに熱膨張を阻止するためにストラットを、スカート部
内周に鋳込んでいる。A strut is cast into the inner periphery of the skirt part of the piston, which is composed of a top part, a skirt part, and a boss part, to prevent thermal expansion.

（発明が解決しようとする問題点） 上記ピストンは熱膨張による外形の拡大をストラットに
より防止しようとしているが、該ストラット自身の熱膨
張の影響を受は頂部外周面に於いて、局所的に外形が拡
大し、シリンダボア内周面との接触により摩擦、摩耗が
発生する不具合を有していた。(Problem to be Solved by the Invention) The above piston uses struts to prevent expansion of the outer diameter due to thermal expansion, but the outer circumferential surface of the top part is locally affected by the thermal expansion of the strut itself. The problem was that friction and wear occurred due to the expansion of the cylinder bore and contact with the inner circumferential surface of the cylinder bore.

従って本発明は、上記不具合を解消するために、頂部外
周部の熱膨張を阻止することを、その技術的課題とする
。Therefore, the technical object of the present invention is to prevent thermal expansion of the outer circumferential portion of the top in order to eliminate the above-mentioned problems.

〔発明の構成〕[Structure of the invention]

（問題点を解決するための手段） 上記技術的課題を解決するために講じた技術的手段は、
頂部円周上にピストン本体の材質より熱膨張係数の小さ
い材質で形成されたリングを固定する、ことである。(Means to solve the problem) The technical measures taken to solve the above technical problem are:
A ring made of a material with a coefficient of thermal expansion smaller than that of the material of the piston body is fixed on the top circumference.

（作用） 上記の如く、ピストン頂部外周にピストン本体よりも熱
膨張係数の小さい材料で形成したリングを固定すること
により、ピストンの頂部外周部の熱による外への膨張が
小さく抑えることが可能となる。(Function) As described above, by fixing a ring made of a material with a smaller coefficient of thermal expansion than the piston body to the outer periphery of the top of the piston, it is possible to suppress the outward expansion due to heat of the outer periphery of the top of the piston. Become.

（実施例） 以下、添付図に基づき本発明の技術的手段を具体化した
実施例について説明すると、ピストン本体は頂部１．ス
カート部２．対称する位置を貫通する穴を有するピンボ
ス部３．第１　？Ｒ４ａ　、第２溝４ｂ、油溝４ｃから
構成され、ピストン頂部１の外周部には鋳鉄で形成され
たリング５が鋳込まれている。(Embodiment) Hereinafter, an embodiment embodying the technical means of the present invention will be described based on the attached drawings.The piston body has a top portion 1. Skirt part 2. Pin boss portion 3 with holes passing through symmetrical positions. First? It consists of R4a, a second groove 4b, and an oil groove 4c, and a ring 5 made of cast iron is cast into the outer periphery of the piston top 1.

リング５はピストン本体の材質よりも熱膨張係数が小さ
く、耐熱性のよい材質であればよく、例えばチタン合金
が好ましい。The ring 5 may be made of any material that has a coefficient of thermal expansion smaller than that of the material of the piston body and has good heat resistance, and is preferably made of a titanium alloy, for example.

〔発明の効果〕〔Effect of the invention〕

頂部の外周をピストン本体より熱膨張係数の小さい材質
のリングで固定することにより頂部の外側への膨張が減
少し、シリンダ内周面との摩擦が減少し潤滑オイルの消
費が減り、ブローポイガスの発生も減る等の実用上の優
れた効果を有する。By fixing the outer periphery of the top with a ring made of a material with a smaller coefficient of thermal expansion than the piston body, the outward expansion of the top is reduced, reducing friction with the inner circumferential surface of the cylinder, reducing consumption of lubricating oil, and generating blow gas. It has excellent practical effects such as reducing

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

図は本発明の実施例を示すピストンの縦断面図である。 １・・・頂部、２・・・スカート部、３・・・ピンボス
部、５・・・リングThe figure is a longitudinal sectional view of a piston showing an embodiment of the present invention. 1...Top part, 2...Skirt part, 3...Pin boss part, 5...Ring

Claims (1)

【特許請求の範囲】[Claims] 頂部、スカート部、ピンスボス部を有するピストンにお
いて、該ピストンの頂部の外周部に、前記ピストンの材
質よりも熱膨張係数が小さい材質で形成されたリングを
固定してなるピストン。A piston having a top portion, a skirt portion, and a pin boss portion, the piston having a ring made of a material having a smaller coefficient of thermal expansion than the material of the piston fixed to the outer periphery of the top portion of the piston.
JP26798585A 1985-11-28 1985-11-28 Piston Pending JPS62129550A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26798585A JPS62129550A (en) 1985-11-28 1985-11-28 Piston

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26798585A JPS62129550A (en) 1985-11-28 1985-11-28 Piston

Publications (1)

Publication Number Publication Date
JPS62129550A true JPS62129550A (en) 1987-06-11

Family

ID=17452309

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26798585A Pending JPS62129550A (en) 1985-11-28 1985-11-28 Piston

Country Status (1)

Country Link
JP (1) JPS62129550A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4881501A (en) * 1988-02-03 1989-11-21 Nissan Motor Co., Ltd. Diesel engine having shaped flame dispersing recess in piston crown

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4881501A (en) * 1988-02-03 1989-11-21 Nissan Motor Co., Ltd. Diesel engine having shaped flame dispersing recess in piston crown

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