JPH02201063A - Cylinder of two-cycle engine - Google Patents

Cylinder of two-cycle engine

Info

Publication number
JPH02201063A
JPH02201063A JP2063189A JP2063189A JPH02201063A JP H02201063 A JPH02201063 A JP H02201063A JP 2063189 A JP2063189 A JP 2063189A JP 2063189 A JP2063189 A JP 2063189A JP H02201063 A JPH02201063 A JP H02201063A
Authority
JP
Japan
Prior art keywords
cylinder
rib
cylinder sleeve
water jacket
boss
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
JP2063189A
Other languages
Japanese (ja)
Inventor
Yoichi Nakayama
洋一 中山
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.)
Suzuki Motor Corp
Original Assignee
Suzuki Motor Corp
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 Suzuki Motor Corp filed Critical Suzuki Motor Corp
Priority to JP2063189A priority Critical patent/JPH02201063A/en
Publication of JPH02201063A publication Critical patent/JPH02201063A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • 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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/18—Other cylinders
    • F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

PURPOSE:To prevent abnormal temp. rise of a rib equipped with a plate-shaped boss by mounting the rib on the outer surface of a cylinder sleeve, putting the boss in contact with a water jacket, and radiating the heat from rib to this water jacket through the boss. CONSTITUTION:A cylinder sleeve 2 is installed on the inner surface of a cylinder bore formed in a cylinder barrel 1. In this cylinder sleeve 2 are bored a suction port 4 leading to a suction passage 3, an exhaust port 6 leading to an exhaust passage 5, and a scavenging port 7. Therein a rib 8 extending in the axial direction is provided in the center of the exhaust port 6. The rib 8 is equipped with a plate-shaped boss 8a extending in the axial direction along the outer surface of the cylinder sleeve 2. The boss 8a is inserted into a recess 9a formed in a water jacket 9. The heat from rib 8 is radiated to this water jacket 9 through the boss 8a.

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、自動車やオートバイ等の２サイクルエンジン
、特に２サイクル水冷エンジンのシリンダに関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a cylinder for a two-stroke engine such as an automobile or a motorcycle, particularly a two-stroke water-cooled engine.

（従来の技術及び発明が解決しようとする課題）一般に
、２サイクル水冷エンジンのシリンダにおいては、アル
ミ等によって形成されたシリンダバレルの内面に、鋳鉄
その他の材質からなるシリンダスリーブを圧入または鋳
込み、ピストンとの″摺接面を形成することが行なわれ
ている。(Prior Art and Problems to be Solved by the Invention) In general, in the cylinder of a two-stroke water-cooled engine, a cylinder sleeve made of cast iron or other material is press-fitted or cast into the inner surface of a cylinder barrel made of aluminum or the like. Forming a "sliding surface" with

上記シリンダスリーブは単純な円筒形で、その側壁部に
排気ポート、吸気ポート、掃気ポートが穿設されている
だけで、上記スリーブ単体には特に冷却効果をもたせる
ための形状は施されていない。The cylinder sleeve has a simple cylindrical shape, and only has an exhaust port, an intake port, and a scavenging port bored in its side wall, and the sleeve alone is not shaped to provide a cooling effect.

ところが、最近２サイクルエンジンの高性能化に伴ない
、シリンダの各ポート面積、特に排気ポートの拡大が著
しく、単なる丸ポートではその面積に限界がでてきた。However, with the recent improvement in the performance of two-stroke engines, the area of each cylinder port, especially the exhaust port, has increased significantly, and a simple round port has reached its limit in area.

そこで、シリンダスリーブの耐久性等から排気ポートの
中央リブを設けることも行なわれている。Therefore, for reasons such as durability of the cylinder sleeve, a central rib of the exhaust port is provided.

しかしながら、この排気ポートに設けられるリブは、そ
の位置の関係上非常に高温となり、ビストン焼付等のト
ラブルの原因となる等の問題がある。However, due to its position, the rib provided at the exhaust port becomes extremely hot, which causes problems such as piston seizure.

本考案はこのような点に鑑み、上記シリンダスリーブの
排気ポートに設けられたリブの冷却効率を向上させ、上
記ピストンの焼付等のトラブルを防止し得るようにした
２サイクルエンジンのシリンダを得ることを目的とする
。In view of these points, the present invention aims to improve the cooling efficiency of the ribs provided at the exhaust port of the cylinder sleeve, and to obtain a cylinder for a two-stroke engine that can prevent troubles such as seizure of the piston. With the goal.

〔発明の構成〕[Structure of the invention]

本発明は、シリンダスリーブの外面に、排気ポートの中
央部に設けられたリブと一体的に形成され、スリーブの
軸線方向に延びる板状の突起部を形成するとともに、そ
のシリンダスリーブをシリンダバレルに圧入又は鋳込み
、上記板状の突起部の稜側面をシリンダバレルのウォー
タジャケットに接するようにしたことを特徴とするもの
である。The present invention forms a plate-shaped protrusion on the outer surface of the cylinder sleeve that is integrally formed with a rib provided at the center of the exhaust port and extends in the axial direction of the sleeve, and also connects the cylinder sleeve to the cylinder barrel. It is characterized by being press-fitted or cast, and the ridge side of the plate-shaped protrusion is brought into contact with the water jacket of the cylinder barrel.

（作　用） シリンダスリーブの排気ポートに設けられたリブと一体
的に設けられた板状突起部がウォータジャケットに接す
るようにしであるため、上記リブにおける熱が板状の突
起部を介してウォータジャゲットに放熱される。すなわ
ち、上記ウォータジャケットによって突起部を介してリ
ブ部が冷却され、リブ部の異常高温が防止され、ピスト
ン焼付等のトラブルが防止される。(Function) Since the plate-shaped protrusion integrally provided with the rib provided on the exhaust port of the cylinder sleeve is in contact with the water jacket, the heat in the rib is transferred to the water via the plate-shaped protrusion. Heat is radiated to the jaguette. That is, the rib portion is cooled by the water jacket via the protrusion, thereby preventing the rib portion from becoming abnormally high in temperature, thereby preventing troubles such as piston seizure.

（実施例） 以下、添付図面を参照して本発明の一実施例について説
明する。(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

第１図において符号１は２サイクルエンジンのシリンダ
バレルであって、そのシリンダバレル１に形成されたシ
リンダボア内面にはこれと同心状に円筒状のシリンダス
リーブ２が圧入又は鋳込みにより装着されている。In FIG. 1, reference numeral 1 denotes a cylinder barrel of a two-stroke engine, and a cylindrical cylinder sleeve 2 is fitted concentrically to the inner surface of a cylinder bore formed in the cylinder barrel 1 by press-fitting or casting.

上記シリンダスリーブ２には、吸気通路３に連通する吸
気ポート４、排気通路５に連通する排気ポート６、およ
び掃気通路（図示せず）に連通する掃気ポート７が穿設
されている。The cylinder sleeve 2 is provided with an intake port 4 communicating with an intake passage 3, an exhaust port 6 communicating with an exhaust passage 5, and a scavenging port 7 communicating with a scavenging passage (not shown).

ところで、上記シリンダスリーブ２の排気ポート６の中
央部には、第２図に示すように、軸線方向に延びるリブ
８が設けられている。このリブ８にはシリンダスリーブ
２の外面に沿い軸線方向に延びる板状突起部８ａが一体
的に形成されており、この板状突起部８ａがシリンダス
リーブ２の外面から放射方向に突設されている。Incidentally, a rib 8 extending in the axial direction is provided at the center of the exhaust port 6 of the cylinder sleeve 2, as shown in FIG. This rib 8 is integrally formed with a plate-shaped protrusion 8a that extends in the axial direction along the outer surface of the cylinder sleeve 2, and this plate-shaped protrusion 8a projects radially from the outer surface of the cylinder sleeve 2. There is.

そこで、上記板状突起部８ａは、シリンダスリーブ２が
シリンダバレル１に装着された場合、そのシリンダバレ
ル１のつす一タジャケット９に設けられた凹部９ａ内に
挿入された状態となり、板状突起部８ａの両面がウォー
タジャケット９に接するようにしである。Therefore, when the cylinder sleeve 2 is attached to the cylinder barrel 1, the plate-shaped protrusion 8a is inserted into the recess 9a provided in the two-piece jacket 9 of the cylinder barrel 1, and the plate-shaped protrusion 8a Both sides of the protrusion 8a are in contact with the water jacket 9.

しかして、エンジンが駆動されると、シリンダ内が高温
となり、特に排気ポート６に設けられたリブ８は高温の
排ガスによって高温となる。しかし、この熱は上記リブ
８と一体的に形成された板状突起部８ａを介してつ中−
クジヤケブト９内の冷却水に放熱され、上記リブ８部が
異常に高温となることが防止される。When the engine is driven, the inside of the cylinder becomes hot, and in particular, the ribs 8 provided in the exhaust port 6 become hot due to the high-temperature exhaust gas. However, this heat is transferred through the plate-like protrusion 8a formed integrally with the rib 8.
Heat is radiated to the cooling water in the kujiyakebutu 9, and the above-mentioned rib 8 portion is prevented from becoming abnormally high temperature.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明においてはシリンダスリー
ブの外面に、排気ポートの中央部に設けられたリブと一
体的に形成された板状突起部を突設し、この板状突起部
の両側面をウォータジャケットに接するようにしたので
、その板状突起部を介してリブ部の熱がウォータジャケ
ットに放熱され、リブ部の冷却効果が高められリブ部の
異常高温化が防止される。したがって、リブ部の異常高
温によってピストン焼付等のトラブルが発生するような
ことが確実に防止される。しかも、スリーブの形状を若
干変更するのみで上記効果を奏せしめることができ、特
別の装置を設ける必要もない等の効果を奏する。As explained above, in the present invention, a plate-shaped protrusion integrally formed with the rib provided at the center of the exhaust port is provided on the outer surface of the cylinder sleeve, and both sides of the plate-shaped protrusion are Since the rib portion is brought into contact with the water jacket, the heat of the rib portion is radiated to the water jacket through the plate-like protrusion portion, the cooling effect of the rib portion is enhanced, and abnormal heating of the rib portion is prevented. Therefore, troubles such as piston seizure due to abnormally high temperatures of the rib portion can be reliably prevented. Furthermore, the above effects can be achieved by only slightly changing the shape of the sleeve, and there is no need to provide any special equipment.

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

第１図は本発明の２サイクルエンジンのシリンダの縦断
面図、第２図はシリンダスリーブの斜視図である。 １・・・シリンダバレル、２・・・シリンダスリーブ、
６・・・排気ポート、８・・・リブ、８ａ・・・板状突
部、９・・・ウォータジャケット。 出願人代理人　　佐　　藤　　−雄FIG. 1 is a longitudinal sectional view of a cylinder of a two-stroke engine according to the present invention, and FIG. 2 is a perspective view of a cylinder sleeve. 1... Cylinder barrel, 2... Cylinder sleeve,
6... Exhaust port, 8... Rib, 8a... Plate-shaped protrusion, 9... Water jacket. Applicant's agent Mr. Sato

Claims (1)

【特許請求の範囲】[Claims] シリンダスリーブの外面に、排気ポートの中央部に設け
られたリブと一体的に形成され、スリーブの軸線方向に
延びる板状の突起部を形成するとともに、そのシリンダ
スリーブをシリンダバレルに圧入又は鋳込み、上記板状
の突起部の両側面をシリンダバレルのウォータジャケッ
トに接するようにしたことを特徴とする、２サイクルエ
ンジンのシリンダ。Forming a plate-shaped protrusion on the outer surface of the cylinder sleeve that is integrally formed with a rib provided at the center of the exhaust port and extending in the axial direction of the sleeve, and press-fitting or casting the cylinder sleeve into the cylinder barrel; A cylinder for a two-stroke engine, characterized in that both sides of the plate-shaped protrusion are in contact with a water jacket of a cylinder barrel.
JP2063189A 1989-01-30 1989-01-30 Cylinder of two-cycle engine Pending JPH02201063A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2063189A JPH02201063A (en) 1989-01-30 1989-01-30 Cylinder of two-cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2063189A JPH02201063A (en) 1989-01-30 1989-01-30 Cylinder of two-cycle engine

Publications (1)

Publication Number Publication Date
JPH02201063A true JPH02201063A (en) 1990-08-09

Family

ID=12032579

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2063189A Pending JPH02201063A (en) 1989-01-30 1989-01-30 Cylinder of two-cycle engine

Country Status (1)

Country Link
JP (1) JPH02201063A (en)

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