| 摘要 |
An air-intake device of an engine for a leisure vehicle, in which at least two air-intake passages are arranged within an engine body of the engine, is disclosed, including an air-intake pipe through which fresh air is supplied to the at least two air-intake passages arranged within the engine body, and a throttle valve openably mounted within a passage of the air-intake pipe. Typically, the air-intake pipe is structured such that the passage has a cross-section of a non-perfect circle shape and an outer periphery of the air-intake pipe has a cross-section of a circle shape with a continuously varying positive curvature. Typically, the throttle valve has a valve disc of a non-perfect circle shape conforming to the shape of the cross-section of the passage of the air-intake pipe.
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