Catalyst arrangement construction of two-wheel motor vehicle

Abstract

The catalyst of the maneuvering two-wheeled vehicle of the invention is arranged and structured on a main frame extended from head towards rear of the vehicle frame and a lower extending frame extended from head tube towards to rear and lower inclination of the vehicle frame, the rear of the lower extending frame is arranged with an engine, the exhaust pipe extended from the engine firstly towards lower, then towards rear is arranged with a metal honeycomb type catalyst; wherein, the front and the back of the metal honeycomb type catalyst of the exhaust pipe forms a first conic section and a second conic section which are gradually expands towards the metal honeycomb type catalyst, the metal honeycomb type catalyst is arranged along the lower extending frame. Thus, while improving the purification efficiency of the metal honeycomb type catalyst, the engine output is improved at the same time, and the cost is reduced.

Description

technical field [0001] The present invention relates to an improvement of a catalyst arrangement structure of a motorcycle. Background technique [0002] As a catalyst arrangement structure of a conventional motorcycle, a configuration in which a honeycomb catalyst is arranged in a plurality of exhaust pipes extending from a V-shaped engine is known (for example, refer to Patent Document 1). [0003] [Patent Document 1] Japanese Patent No. 3242488 [0004] FIG. 2 of Patent Document 1 will be described below. [0005] The front side exhaust pipe 7 and the rear side exhaust pipe 8 are respectively connected to the front side cylinder 6a and the rear side cylinder 6b of the V-type 2-cylinder engine, and the respective ends of the front side exhaust pipe 7 and the rear side exhaust pipe 8 Connected to the integrated exhaust pipe 21, the honeycomb secondary catalyst 19 is arranged in the front exhaust pipe 7, and the honeycomb secondary catalyst 20 is arranged in the rear exhau...

AI Technical Summary

Problems solved by technology

[0007] If only the main catalyst 22 is used for activation, the main catalyst 22 is respectively arranged to replace the sub-catalysts 19, 20 next to the front side exhaust pipe 7 and the rear side exhaust pipe 8, then the large main catalyst 22 may become a large exhaust gas. air resistance, can not ensure engine output

[0008] In addition, when a plurality of catalysts are provided such as the main catalyst 22 and the sub-catalysts 19, 20, the cost increases

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