Exhaust system for motorcycle

Abstract

In an exhaust system of a motorcycle in which an exhaust muffler (33) is connected to an exhaust pipe (32) extending from a cylinder head (22) of an engine body (19), and in which the outer side surface of the exhaust muffler (33) is covered with a protector (37), an excellent durability and appearance are to be accomplished, and an excellent heat resistance property is to be accomplished to blockthe heat from the exhaust muffler (33). The invention now provides a protector (37) composed of a first protector member (38) and a second protector member. The metallic first protector member (38) covers at least the outer side surface of an exhaust muffler (33). The second protector member (39), which is made of a synthetic resin, covers the first protector member (38) from the outer side whilean upper portion of the first protector member (38) is left uncovered so as to be exposed to the outside.

Description

technical field [0001] The invention relates to an exhaust device of a two-wheeled motor vehicle, the exhaust muffler of which is connected to the exhaust pipe extending from the cylinder head of the engine main body, and the upper part and the outer side of the exhaust muffler are covered by a protective device. Background technique [0002] Patent Document 1 discloses an exhaust device in which an exhaust muffler is covered with a single protective device made of metal, and Patent Document 2 discloses an exhaust device in which an exhaust muffler is covered with a protective member made of synthetic resin in two layers, inner and outer. Exhaust on the outside. [0003] Patent Document 1: Japanese Patent Application Laid-Open No. 5-209519 [0004] Patent Document 2: Japanese Patent Laid-Open No. 2005-344552 [0005] However, in the technology disclosed in Patent Document 1, since the protector is made of metal, it has the advantage of being easily cooled by the running wi...

AI Technical Summary

Problems solved by technology

[0005] However, in the technology disclosed in Patent Document 1, since the protector is made of metal, it has the advantage of being easily cooled by the running wind, and the thermal conductivity is high, and it is transmitted to the protector by covering the upper part of the exhaust muffler with the highest temperature. The heat is easily dissipated to the overall protection device

In addition, when the metal surface extends to the side of the exhaust muffler as a whole, it highlights the existence of the exhaust muffler, which increases the sense of weight, and the appearance is difficult to match with a sporty two-wheeled motor vehicle

[0006] In addition, in the technology disclosed in Patent Document 2, the protective members of the inner and outer layers constituting the protective device are made of synthetic resin, so that the diffusion of heat can be suppressed, and it is easy to accumulate heat, and it is difficult to cool it even with running wind. The problem is that, in addition to the need to improve durability compared with metal products, in order to obtain gloss, it needs to be treated such as painting, and the price is high

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