JPS6456519U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a side view of an engine exhaust pipe structure according to an embodiment of the present invention, FIG. 2 is a waveform diagram showing the relationship between frequency and sound pressure level of exhaust sound in the device of FIG. 1, and FIG. The figure is a waveform diagram showing the relationship between the engine speed and the sound pressure level of exhaust sound in the present invention and the conventional structure. Figure 4 is a sound pressure pulsation waveform diagram in an equal length exhaust system. Figure 5 is a waveform diagram in an equal length exhaust system. FIG. 6 is a front view of the exhaust pipe of an internal combustion engine disclosed in Japanese Patent Laid-Open No. 60-243317, and FIG. 7 is a waveform diagram showing the relationship between explosion order components and sound pressure levels. A side view of the exhaust system of an internal combustion engine disclosed in Publication No. 61-58617, FIG. 8 is a plan view of FIG. 7,
It is. 21...V-type engine, 22, 23...Exhaust manifold, 24, 25...Exhaust pipe, 26...Collection part, _l1 , _l2 ...Length of exhaust pipe.

Claims (1)

[Scope of Claim for Utility Model Registration] In an exhaust pipe structure for an engine that has cylinder groups on the left and right, exhaust pipes are connected to each cylinder group, and the exhaust pipes are gathered downstream, Difference in length Δl from each cylinder group to the collecting part of the pipe
An engine exhaust pipe structure characterized in that [m] is set within the following range. Δl≦96√/n・N Where, To: Exhaust temperature [K] n: Number of engine cylinders N: Engine rotation speed [rpm].