JPH038619U - - Google Patents

Description

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

第１図はこの考案の２サイクルエンジンの排気
装置の要部を模式的に表した断面図、第２図ａは
同じく高速回転時の排気ポートを模式的に表した
正面図、第２図ｂは同じく低速回転時の排気ポー
トを模式的に表わした正面図、第３図は第２図ｂ
の低速回転時における排気ガスの流れ状況を模式
的に表した拡大断面図、第４図は従来の２サイク
ルエンジンの排気装置の要部を模式的に表わした
断面図、第５図ａは同じく高速回転時の排気ポー
トを模式的に表した正面図、第５図ｂは同じく低
速回転時の排気ポートを模式的に表した正面図で
ある。 １……シリンダ、２……主排気通路、３……主
バルブ、４……排気ポート、５ａ，５ｂ……段差
、６ａ，６ｂ……段差、７ａ，７ｂ……隙間、Ｌ
……内部幅寸法、ｌ……間口寸法。 Fig. 1 is a cross-sectional view schematically showing the main parts of the exhaust system of the two-stroke engine of this invention, Fig. 2 a is a front view schematically showing the exhaust port at high speed rotation, and Fig. 2 b is also a front view schematically showing the exhaust port at low speed rotation, and Figure 3 is Figure 2 b.
Fig. 4 is an enlarged sectional view schematically showing the flow of exhaust gas during low speed rotation of the engine, Fig. 4 is a sectional view schematically showing the main parts of the exhaust system of a conventional two-stroke engine, and Fig. 5a is the same. FIG. 5b is a front view schematically showing the exhaust port during high speed rotation, and FIG. 5b is a front view schematically showing the exhaust port during low speed rotation. 1...Cylinder, 2...Main exhaust passage, 3...Main valve, 4...Exhaust port, 5a, 5b...Step, 6a, 6b...Step, 7a, 7b...Gap, L
...internal width dimension, l...frontage dimension.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] シリンダに連通する主排気通路内で主バルブを
上下動させることによりエンジンの回転速度に応
じた主排気通路のポート断面積が得られるように
した２サイクルエンジンの排気装置において、主
排気通路をその開口寸法に比べ内部幅寸法が幅広
となるように段差を付けて形成するとともに主バ
ルブを上記排気通路の内部形状と略相似に形成し
たことを特徴とする２サイクルエンジンの排気装
置。 In a two-stroke engine exhaust system, the main exhaust passage is connected to the main exhaust passage in a two-stroke engine exhaust system that allows the port cross-sectional area of the main exhaust passage to be adjusted according to the engine rotational speed by moving the main valve up and down in the main exhaust passage communicating with the cylinder. 1. An exhaust system for a two-stroke engine, characterized in that the main valve is formed with a step so that the internal width is wider than the opening, and the main valve is formed to have a substantially similar internal shape to the exhaust passage.