Two-wheeled motor vehicle

Abstract

A two-wheeled motor vehicle has a downwardly bending main frame (20b), an engine (1) and an air cleaner (26) that are arranged below the main frame (20b), and a suction pipe provided below the main frame (20b) at a position between the engine (1) and the air cleaner (26). The engine (1) has a cylinder head with an injector arrangement portion, where an injector (11) injecting a fuel is provided. An injection nozzle (11a) is also provided on the injector arrangement portion such that the injection nozzle is at a position that is between the axis of a suction valve (7) and the center axis of a suction port (3g) and that is close to an end portion on the suction valve side of the suction port (3g). The suction pipe and the injector are arranged at positions that do not interfere with each other. As a result, the interference between the injector and the main frame can be avoided, and the degree of freedom of mounting the engine on a vehicle body is prevented from being reduced. Further, the suction characteristics and output of the engine are improved.

Description

technical field [0001] The present invention relates to a motorcycle equipped with an engine provided with an intake device having a fuel injection valve in the middle of an intake passage. Background technique [0002] A conventional underbone type (Anda-Bo-n) two-wheeled motorcycle has a vehicle frame as shown in the two-wheeled motorcycle 50 of FIG. The fender 52 has a center beam (spine frame) 54 above which is inclined from a head pipe 53 that freely steerably supports the handlebar to the rear and downward of the vehicle body; and an engine 55 is disposed below the center beam 54 . [0003] The engine 55 is fixed below the center sill 54 by the crankcase 55c, and the cylinder head (ヘッドイイリンダ) 55a assembled on the cylinder barrel (Bodysilinda) 55b is located in front of the vehicle body so that it can be cooled by the running wind. In addition, an air cleaner 56 is mounted on the front portion of the vehicle body of the center sill 54, and between the air cleaner 56 and...

AI Technical Summary

Problems solved by technology

[0011] That is, when the above-mentioned engine is suspended and fixed from the head pipe to the lower side of the main pipe inclined rearward and downward in the bent-beam frame, since the above-mentioned injector is likely to interfere with the main pipe, the installation position of the engine needs to be lowered downward. Or arrange the injectors inclined to either side or shifted to either side, etc., which will reduce the degree of freedom of engine installation on the vehicle body

In addition, if it is arranged so as not to interfere with the main pipe (center sill), as shown in Fig. 2, the bending radius becomes smaller and the air intake resistance increases, hindering output improvement

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