Saddle-type vehicle exhaust device

Abstract

The present invention relates to a saddle-type vehicle exhaust device. The saddle-type vehicle exhaust device includes a muffler (80) and an exhaust pipe (70) connected to the internal combustion engine (2). The muffler has an outer housing (82 or 182) serving as a housing (81 or 181) and a partition (84) defining a plurality of expansion compartments (83). The exhaust pipe has a downstream open end (72) provided in the first expansion compartment (83A) which is an expansion compartment in the bottom of the expansion compartment. The muffler has a drain hole (91 or 191) providing fluid communication between the first expansion compartment and the exterior of the muffler. The muffler comprises a tubular member (85 or 185) having a double wall structure in which the inner housing is disposed in the outer housing and the cover (92 or 197) is disposed in the first expansion compartment and into a cover relationship with the drain hole.

Description

technical field [0001] The present invention relates to an exhaust device for use on a saddle type vehicle, which is provided with an exhaust pipe and a muffler. Background technique [0002] As disclosed in Patent Document 1 mentioned below, an exhaust device provided with a muffler and an exhaust pipe having an upstream side connected to an internal combustion engine is known as a conventional exhaust device used on a saddle type vehicle. section and connected to the downstream section of the muffler. [0003] The muffler of the exhaust device disclosed in Patent Document 1 includes an outer casing serving as an outer casing and a partition that divides the inside of the outer casing into a plurality of expansion compartments. When the exhaust device is mounted on a saddle-type vehicle, a drain hole is provided in the lowermost one of the expansion compartments in the outer casing. [0004] However, since the structure disclosed in Patent Document 1 enables the downstrea...

AI Technical Summary

Problems solved by technology

Mufflers tend to be oversized if they have to be set in the same expansion compartment and in separate locations

[0006] If the downstream opening end of the exhaust pipe opens in an expansion chamber different from that in which the drain hole is located, a limit is imposed on the length of the exhaust pipe set according to the output of the internal combustion engine, making it difficult for the internal combustion engine to exhibit the desired output characteristics

[0007] On the other hand, if the drain hole is provided in another expansion compartment, the vent hole may not be provided at a lower location in the muffler and may find it difficult to function adequately

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