JPH046521U

JPH046521U -

Info

Publication number: JPH046521U
Application number: JP4414890U
Authority: JP
Priority date: 1990-04-24
Filing date: 1990-04-24
Publication date: 1992-01-21

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例にかかる排気装置
を車体フレームと共に示す側面図、第２図は同平
面図、第３図はサイレンサを示す縦断面図、第４
図はバルブの平面断面図、第５図は駆動装置を示
す概略構成図、第６図は回転数に対するエンジン
の出力を示す特性図である。１０……排気管、１２……（第１）膨張室、４
０……バルブ、４１……弁体、６０……駆動装置
、Ｇ……排気、Ｈ……高速域、Ｓ……中速域。 Fig. 1 is a side view showing an exhaust system according to an embodiment of this invention together with a vehicle body frame, Fig. 2 is a plan view thereof, Fig. 3 is a longitudinal sectional view showing a silencer, and Fig. 4
FIG. 5 is a plan sectional view of the valve, FIG. 5 is a schematic configuration diagram showing the drive device, and FIG. 6 is a characteristic diagram showing engine output versus rotation speed. 10...exhaust pipe, 12...(first) expansion chamber, 4
0... Valve, 41... Valve body, 60... Drive device, G... Exhaust, H... High speed range, S... Medium speed range.

Claims

[Claims for Utility Model Registration] (1) In an exhaust system for a two-stroke engine in which an expansion chamber is provided near the exhaust port of a cylinder in an exhaust pipe, the expansion chamber is located downstream of the expansion chamber in the exhaust pipe, and the expansion chamber is located downstream of the expansion chamber in the exhaust pipe. A valve that adjusts the passage area of the pipe, and a drive device that holds the valve at a fully open position when the engine is in a medium speed range and rotates the valve to a throttle position when the engine is in a high speed range. An exhaust system for a two-stroke engine that is characterized by: (2) In claim (1), the valve has a valve body formed of a ring-shaped thin plate inscribed in the exhaust pipe,
An exhaust system for a two-stroke engine, wherein the radial direction of the ring-shaped valve body is set in the flow direction of exhaust gas at a fully open position, and set in a direction substantially perpendicular to the flow of exhaust gas at a throttle position.