Patent ID: 8813724
Filing Date: 2014-08-26
Classification: B62J,B62K

Abstract:
1. An evaporated fuel treatment device for a motorcycle, comprising: a rider's seat supported on a vehicle body frame; a fuel tank which is arranged below the rider's seat and is supported on the vehicle body frame, an engine which generates power for driving a rear wheel arranged below the fuel tank; and a charge pipe passage which allows oil in an engine body of the engine to absorb a fuel gas evaporated in the fuel tank, said charge pipe passage provided between the fuel tank and the engine body, wherein the charge pipe passage includes, a first pipe passage part which is connected to the fuel tank, a second pipe passage part which is connected with the first pipe passage part and extends toward a second side of the fuel tank in a vehicle widthwise direction, and a third pipe passage part, which is connected with the second pipe passage part on the second side of the fuel tank, is connected to the engine body and has a highest part arranged at a highest position of the charge pipe passage at an intermediate position thereof, a first check valve which prevents the flow of oil from an engine body side toward a fuel tank side, said first check valve being interposed on the third pipe passage part downstream of the highest part, an atmospheric air introducing pipe passage, through which atmospheric air is introduced into the inside of the fuel tank, is connected to a branch part which is formed on the third pipe passage part upstream of the first check valve, and a second check valve, which prevents the flow of fuel from the fuel tank side, is interposed on the atmospheric air introducing pipe passage at a position higher than the highest part.