JPS61194726U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
The figure is a sectional view taken along the line --- in FIG. 1, and FIG. 3 is a configuration diagram showing another embodiment of the present invention. 10...Inner tube, 12...Outer tube, 14...Needle valve, 16, 18...Strut, 20, 22...Elongated hole, 24
, 26...Sliding board.

Claims (1)

[Scope of utility model registration request] An outer tube that surrounds the end of the inner tube and forms an outside air introduction path between the inner tube and the inner tube is attached to the inner tube that forms the exhaust gas passage, and the pointed top is directed toward the exhaust gas introduction side of the inner tube. A conical needle valve is inserted from the pipe end of the inner pipe into the outer pipe, and this needle valve is fixed to the outer pipe, and the inner pipe and outer pipe are moved relative to each other depending on the engine operating condition. An exhaust device comprising a needle valve drive mechanism that gradually increases the cross-sectional area of the exhaust gas passage in the inner pipe as the rotational speed shifts from a low speed range to a high speed range.