JPS61135965A - Piston for two-cycle engine - Google Patents

Piston for two-cycle engine

Info

Publication number
JPS61135965A
JPS61135965A JP25798284A JP25798284A JPS61135965A JP S61135965 A JPS61135965 A JP S61135965A JP 25798284 A JP25798284 A JP 25798284A JP 25798284 A JP25798284 A JP 25798284A JP S61135965 A JPS61135965 A JP S61135965A
Authority
JP
Japan
Prior art keywords
piston
ring
expander
cylinder bore
cylinder hole
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
JP25798284A
Other languages
Japanese (ja)
Inventor
Sakae Makino
栄 牧野
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.)
Yamaha Motor Co Ltd
Original Assignee
Yamaha Motor 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 Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Priority to JP25798284A priority Critical patent/JPS61135965A/en
Publication of JPS61135965A publication Critical patent/JPS61135965A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/06—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction using separate springs or elastic elements expanding the rings; Springs therefor ; Expansion by wedging
    • F16J9/061—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction using separate springs or elastic elements expanding the rings; Springs therefor ; Expansion by wedging using metallic coiled or blade springs
    • F16J9/063—Strip or wire along the entire circumference
    • 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

Abstract

PURPOSE:To raise the efficiency of heat transfer and to thereby enhance the cooling effect, by interposing an expander between a piston-ring groove formed in the body of a piston and a piston ring inserted into said piston-ring groove, andthereby forcing the piston more tightly one the internal wall surface of a cylinder bore. CONSTITUTION:A piston 5 has a main body 14 connected to the upper end of a connecting rod 6. A plurality of piston-ring grooves 15-17 are formed in the outer surface of the piston body 14 at upper portions thereof, and a piston ring 19 is fitted ineach of said piston-ring grooves 15-17. In such as arrangement, an expander 20 is interposed between each piston ring 19 and the bottom surface of piston-ring grooves 16, 17 so that the piston ring 19 fitted in the piston-ring grooves 16, 17 are forced onto the internal wall surface of a cylinder bore 2 by stronger resilient forces. Since, b employing such an arrangement, the piston 5 can be kept more tightly to the internal wall surface of the cylinder bore 2, it is enabled to enhance the cooling effect of the piston 5 by raising the efficiency of heat transfer from the piston 5 to the cylinder bore 2.

Description

【発明の詳細な説明】 （産業上の利用分野） この発明は、例えば自動二輪車に搭載される２サイクル
エンジンのピストンに関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a piston for a two-stroke engine mounted on, for example, a motorcycle.

（従来の技術） 例えば、自動二輪車における２サイクルエンジンは高負
荷で運転される場合が多く、そのため、エンジンは高温
化し易い傾向となっている。(Prior Art) For example, two-stroke engines in motorcycles are often operated under high loads, and as a result, the engine tends to heat up easily.

（発明が解決しようとする問題点） ところで、上記エンジンの高温化に対応してシリンダブ
ロックやシリンダヘッドは水冷式により効果的に冷却さ
せることができるが、ピストンはその構造上水冷式など
の冷却手段をとることは困難であり、そのため、このピ
ストンが高温化してプリイグニッションを誘発するなど
の不都合を生じるおそれがある。(Problem to be Solved by the Invention) Incidentally, in response to the above-mentioned high temperature of the engine, the cylinder block and cylinder head can be effectively cooled by water cooling, but the piston, due to its structure, cannot be cooled by water cooling. It is difficult to take such measures, and as a result, there is a risk that this piston will become hot and cause problems such as inducing pre-ignition.

また、その一方において、２サイクルエンジンの運転時
にピストンが首振り動作する場合があり、これによって
このピストンとシリンダ孔内壁との間でピストン打音が
生じるという不都合もある。On the other hand, the piston may swing during operation of the two-stroke engine, which causes a disadvantage that a piston hitting sound is generated between the piston and the inner wall of the cylinder hole.

（発明の目的） この発明は、上記のような事情に注目してなされたもの
で、２サイクルエンジンにおけるピストンの高温化を抑
制すると共に、ピストン打音が生じないようにすること
を目的とする。(Objective of the Invention) This invention was made in view of the above-mentioned circumstances, and its purpose is to suppress the rise in temperature of the piston in a two-stroke engine and to prevent the piston hitting noise from occurring. .

（発明の構成） 上記目的を達成するためのこの発明の特徴とするところ
は、少なくとも二つのピストンリングをシリンダ孔内壁
に弾性的に接当させるようにこれらピストンリングと各
リング溝底面との間にエキスパンダを介在させた点にあ
る。(Structure of the Invention) A feature of the present invention for achieving the above object is that at least two piston rings are arranged between the piston rings and the bottom surface of each ring groove so that the piston rings are brought into elastic contact with the inner wall of the cylinder hole. The point is that an expander is interposed between the two.

（実施例） 以下、この発明の実施例を図面により説明する。(Example) Embodiments of the present invention will be described below with reference to the drawings.

１は２サイクルエンジンで、このエンジン１はシリンダ
孔２が形成されたシリンダブロック３と、シリンダ孔２
の」一部開口を覆うシリンダヘッド４と、同一１−シリ
ンダ孔２内に挿入されたピストン５とを有し、このピス
トン５はコンロッド６を介して図示しないクランク軸に
連結されている。1 is a two-stroke engine, and this engine 1 includes a cylinder block 3 in which a cylinder hole 2 is formed, and a cylinder block 3 in which a cylinder hole 2 is formed.
The cylinder head 4 has a cylinder head 4 that partially covers the opening of the cylinder 1, and a piston 5 inserted into the same cylinder hole 2. The piston 5 is connected to a crankshaft (not shown) via a connecting rod 6.

そして、」−記シリンダ孔２の内壁とシリンダヘッド４
およびピストン５で囲まれた空間が燃焼室７とされ、こ
の燃焼室７に臨むようにシリンダヘッド４に点火プラグ
８が取り付けられている。and the inner wall of the cylinder hole 2 and the cylinder head 4.
A space surrounded by the piston 5 is a combustion chamber 7, and a spark plug 8 is attached to the cylinder head 4 so as to face the combustion chamber 7.

また、上記シリンダブロック３には掃気ポート１０と排
気ポート１１とが形成されると共に、このシリンダブロ
ック３を冷却するための冷却水垢通孔１２が形成される
。また、−１−記シリンダヘッド４にもこの冷却水流通
孔１２を冷却するための他の冷却水流通孔１３が形成さ
れている。Further, the cylinder block 3 is formed with a scavenging port 10 and an exhaust port 11, and is also formed with a cooling limescale passage hole 12 for cooling the cylinder block 3. Further, another cooling water circulation hole 13 for cooling the cooling water circulation hole 12 is also formed in the cylinder head 4 in -1-.

’−ｈ記ピストン５について、以下、詳しく説明する。The pistons 5 shown in '-h' will be described in detail below.

このピストン５はコンロッド６の」一端に連結されたピ
ストン本体１４を有している。このピストン本体１４の
上部外周面には三木の上部、中間部、下部リングＭ！！
５，１６．１７が形成されている。そして、これら各リ
ング溝１５，１６．］７にそれぞれピストンリング１９
が嵌め込まれ、これら各ピストンリング１９の外周面は
それ自体の弾性力でシリンダ孔２の内壁に軸方向摺動自
在に接当させられている。The piston 5 has a piston body 14 connected to one end of the connecting rod 6. Miki's upper, middle, and lower rings M! !
5, 16, and 17 are formed. Each of these ring grooves 15, 16 . ] 7 and piston ring 19 respectively
The outer peripheral surface of each piston ring 19 is brought into contact with the inner wall of the cylinder hole 2 by its own elastic force so as to be slidable in the axial direction.

また、上記中間部リング溝１６と下部リング溝１７とに
嵌め込まれたピストンリング１９．１９をより強い弾性
力でシリンダ孔２の内壁に接当させるように、これらピ
ストンリング１９．１９．！＝中間部リング溝１６およ
び下部リング溝１７の各底面との間にエキスパンダ２０
がそれぞれ介在させられている。Further, the piston rings 19.19.19 fitted into the intermediate ring groove 16 and the lower ring groove 17 are made to contact the inner wall of the cylinder hole 2 with stronger elastic force. ! = Expander 20 between the bottom surfaces of the middle ring groove 16 and the bottom ring groove 17
are interposed respectively.

上記エキスパンダ２０は一木の板ハネを１２角形状に折
り曲げることにより成形されたものである。そして、こ
のエキスパンダ２０の直線部２０ａ内面が」−記中間部
リング溝１６と下部リング溝１７の各底面に接当し、同
上エキスパンダ２０の折曲部２０ｂ外面が各ピストンリ
ング１９の内面に弾性的に接当している。The expander 20 is formed by bending a single wooden board into a dodecagonal shape. The inner surface of the straight portion 20a of this expander 20 contacts the bottom surfaces of the intermediate ring groove 16 and the lower ring groove 17, and the outer surface of the bent portion 20b of the expander 20 contacts the inner surface of each piston ring 19. It is in elastic contact with.

２１は回り止めピンで、下部リング溝１７の底面に突設
され、この回り止めピン２１は、その突出端がピストン
リング１９とエキスパンダ２０の各対向端間に挿入され
てこれら両者の相対的な回動を阻１にしている。Reference numeral 21 denotes a detent pin, which is provided protruding from the bottom surface of the lower ring groove 17. The protruding end of the detent pin 21 is inserted between the opposite ends of the piston ring 19 and the expander 20 to prevent the relative relationship between them. The rotation is prevented by 1.

（発明の効果） この発明によれば、複数のピストンリングをシリンダ孔
の内壁にエキスパンダによって弾性的に接当させたため
、従来に比較してシリンダ孔の内壁とピストンとをより
密着させることができると共に、この密着した部分の面
積を増大させることができる。よって、ピストンの熱が
シリンダ孔の内壁側へ効果的に伝達される。このため、
ピストンの冷却が十分になされるのであり、よって、プ
リイグニッションなど不都合の発生が防止される。(Effects of the Invention) According to the present invention, since the plurality of piston rings are brought into elastic contact with the inner wall of the cylinder hole by the expander, it is possible to bring the inner wall of the cylinder hole and the piston into closer contact than before. At the same time, it is possible to increase the area of this close contact portion. Therefore, the heat of the piston is effectively transferred to the inner wall of the cylinder hole. For this reason,
The piston is sufficiently cooled, thus preventing problems such as pre-ignition.

また、複数のピストンリングがシリンダ孔の内壁に弾性
的に接当されたため、ピストン本体はこれらピストンリ
ングによってシリンダ孔の内壁に二カ所以上で支持され
ることとなる。従って、エンジンの運転時においてピス
トンはシリンダ孔の軸心上に保持されて往復動すること
となる。このため、ピストンの首振り動作が抑制されて
ピストン打音の発生が防止される。Furthermore, since the plurality of piston rings are elastically abutted against the inner wall of the cylinder hole, the piston body is supported by the piston rings at two or more locations on the inner wall of the cylinder hole. Therefore, during engine operation, the piston is held on the axis of the cylinder hole and reciprocates. Therefore, the swinging motion of the piston is suppressed, and the generation of piston hitting noise is prevented.

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

図はこの発明の実施例を示し、第１図はエンジンの部分
拡大断面図、第２図はエンジンの部分縦断面図、第３図
は第１図の［−１１Ｉ線矢視断面図である。 １Φ−エンジン、２−・シリンダ孔、５・・ピストン、
１４−・ピストン本体、１６・命中間部リング溝、１７
・・下部リング溝、１９１１・ピストンリング、２ｏ・
ｅエキスパンダ。The figures show an embodiment of the present invention, in which FIG. 1 is a partial enlarged sectional view of the engine, FIG. 2 is a partial longitudinal sectional view of the engine, and FIG. 3 is a sectional view taken along the line [-11I] in FIG. . 1Φ-engine, 2- cylinder hole, 5- piston,
14-・Piston body, 16・Life center ring groove, 17
・Lower ring groove, 1911・Piston ring, 2o・
e-expander.

Claims (1)

【特許請求の範囲】[Claims] １、シリンダ孔に挿入されるピストン本体の上部外周面
に複数のリング溝を形成し、これら各リング溝にピスト
ンリングを嵌め込んだ２サイクルエンジンのピストンに
おいて、少なくとも二つのピストンリングをシリンダ孔
内壁に弾性的に接当させるようにこれらピストンリング
と各リング溝底面との間にエキスパンダを介在させたこ
とを特徴とする２サイクルエンジンのピストン。1. In a 2-cycle engine piston in which a plurality of ring grooves are formed on the upper outer peripheral surface of the piston body inserted into the cylinder hole, and piston rings are fitted into each of these ring grooves, at least two piston rings are inserted into the inner wall of the cylinder hole. A piston for a two-stroke engine, characterized in that an expander is interposed between these piston rings and the bottom surface of each ring groove so as to bring them into elastic contact with each other.
JP25798284A 1984-12-05 1984-12-05 Piston for two-cycle engine Pending JPS61135965A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25798284A JPS61135965A (en) 1984-12-05 1984-12-05 Piston for two-cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25798284A JPS61135965A (en) 1984-12-05 1984-12-05 Piston for two-cycle engine

Publications (1)

Publication Number Publication Date
JPS61135965A true JPS61135965A (en) 1986-06-23

Family

ID=17313898

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25798284A Pending JPS61135965A (en) 1984-12-05 1984-12-05 Piston for two-cycle engine

Country Status (1)

Country Link
JP (1) JPS61135965A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0226750U (en) * 1988-08-09 1990-02-21

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0226750U (en) * 1988-08-09 1990-02-21

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