SADDLE-RIDDEN-VEHICLE ENGINE

摘要

A combustion engine mounted on a motorcycle includes an engine rotary shaft extending in a vehicle widthwise direction and a supercharger disposed rearwardly of a cylinder block. The combustion engine also includes an air intake duct through which an incoming wind flowing forwardly of a traveling direction with respect to the combustion engine is introduced into the supercharger. The air intake duct is fluid connected with an air intake port of the supercharger after having passed laterally of the combustion engine.

主权项

1. An engine mounted on a saddle riding type vehicle and having an engine rotary shaft extending in a widthwise direction of a vehicle body, which engine comprises:
a crankcase to support the engine rotary shaft; a cylinder block to protrude upwardly from the crankcase; a cylinder head mounted on the cylinder block; a supercharger disposed rearwardly of the cylinder block and operable to supply an intake air to the engine under pressure; and an air intake duct fluid connected with an air intake port of the supercharger and operable to guide an incoming wind, which flows forwardly of the engine, towards the supercharger; in which the air intake port is positioned below an upper end of the cylinder head; the air intake duct passes a lateral space of the cylinder block and below the cylinder head; and the air intake duct has an inner side surface with respect to the widthwise direction, the inner side face being curved at a position forwardly of the air intake port of the supercharger in a direction inwardly of the vehicle widthwise direction towards a rear.