Exhaust pipe structure of automatic two wheel vehicle

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust pipe structure capable of accurately controlling an air-fuel ratio in a motorcycle having two mufflers in its exhaust system while mounting a single cylinder engine thereon.

SOLUTION: In this motorcycle, the single cylinder engine is mounted and two mufflers 18 and 19 are installed in the exhaust system of the single cylinder engine. The exhaust system comprises exhaust outlet pipes 10a and 11a connected to the cylinder head 5 of a single cylinder, a main exhaust pipe 12 for flowing, therein, all exhaust gas in the single cylinder continuously connected to the exhaust outlet pipes 10a and 11a, two branched exhaust pipes 10b and 11b continuously connected to the downstream side of the main exhaust pipe 12, and the mufflers 18 and 19 installed at the end part of the branched exhaust pipes 10b and 11b. An O<SB>2</SB>sensor 14 detecting the concentration of oxygen in the exhaust gas is installed in the main exhaust pipe 12, and catalysts 16 and 17 are installed in the branched exhaust pipes 10b and 11b.

COPYRIGHT: (C)2006,JPO&NCIPI

Description

technical field [0001] The present invention relates to an exhaust pipe structure of an automatic two-wheeled vehicle, in particular to a single-cylinder engine with two mufflers in its exhaust system from the perspective of appearance design and user needs. Exhaust pipe structure for an automatic two-wheeler with a 4-stroke engine. Background technique [0002] For example, in an automatic two-wheeled vehicle equipped with a single-cylinder 4-stroke, 4-valve (2 intake valves, 2 exhaust valves) gasoline fuel injection engine, there is such an automatic two-wheeled vehicle: in order to improve the cooling efficiency of the engine , and in order to avoid failure caused by exhaust heat, two exhaust ports are independently formed on the cylinder head. At this time, two exhaust pipes are connected to the cylinder head corresponding to the respective exhaust ports. There is also such an automatic two-wheeled vehicle: consider using such an exhaust pipe structure in terms of appe...

AI Technical Summary

Problems solved by technology

Therefore, the degree of freedom in the layout of the catalyst corresponding to the exhaust pipe of each cylinder is limited

In addition, since the catalyst is provided near the end of the exhaust pipe on the downstream side, the temperature of the high-temperature exhaust gas on the upstream side cannot be effectively utilized.

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