Patent ID: 8307812

Claim:
A vaporized-fuel processing device for an engine, comprising a canister ( 1 ) provided with a vaporized-fuel inlet ( 2 ) and with an air inlet ( 3 ) as well as with a purge-gas outlet ( 4 ), the vaporized-fuel inlet ( 2 ) being communicated with the vaporized-fuel outlet ( 6 ) of a fuel reservoir ( 5 ) and the air inlet ( 3 ) being communicated with the air, the purge-gas outlet ( 4 ) being also communicated with the purge-gas sucking port ( 8 ) of the intake-air passage ( 7 ), the vaporized fuel ( 9 ) within the fuel reservoir ( 5 ) being adsorbed to an adsorbing member of the canister ( 1 ), while the engine is in operation, the intake-air negative pressure produced in the intake-air passage ( 7 ) being made to suck the air ( 10 ) from the air inlet ( 3 ) into the canister ( 1 ), the air ( 10 ) separating the vaporized fuel ( 9 ) adsorbed to the adsorbing member of the canister ( 1 ), the purge gas ( 11 ) resulting from mixing the vaporized-fuel ( 9 ) into the air ( 10 ) being sucked from the purge-gas sucking port ( 8 ) into the intake-air passage ( 7 ), wherein a throttle body ( 12 ) is arranged in the intake-air passage ( 7 ) and has a throttle passage ( 13 ), which is provided with a throttle valve ( 14 ), an intake-air pipe ( 15 ) is arranged intake-upstream of the throttle body ( 12 ) and is communicated with the throttle intake-air passage ( 13 ), the intake-air pipe ( 15 ) having a peripheral wall ( 16 ) to which a purge-gas sucking pipe ( 17 ) is detachably attached, the purge-gas sucking port ( 8 ) being provided within the purge-gas sucking pipe ( 17 ), during the engine's operation, in order for the intake-air negative pressure produced in the intake-air passage ( 7 ) to suck blow-by gas ( 20 ) from a breather chamber ( 19 ) to the intake-air pipe ( 15 ), a blow-by gas sucking pipe ( 18 ) is communicated with the breather chamber ( 19 ), the intake-air pipe ( 15 ) has a horizontal pipe portion ( 15 a ) to an upper peripheral wall ( 15 b ) of which the purge-gas sucking pipe ( 17 ) is attached diagonally downwardly, the intake-air pipe ( 15 ) has the horizontal pipe portion ( 15 a ) to the upper peripheral wall ( 15 b ) of which the blow-by gas sucking pipe ( 18 ) has a blow-b gas outlet passage ( 18 a ) attached diagonally downwardly, the blow-by gas sucking pipe ( 18 ) and the purge gas sucking pipe ( 17 ) are arranged dividedly in the left and right direction and the blow-by gas outlet passage ( 18 a ) of the blow-by gas sucking pipe ( 18 ) and the purge-gas sucking pipe ( 17 ) are inclined downwardly in the direction that brings them toward each other, and the purge-gas sucking pipe ( 17 ) is arranged so that it is positioned away from an intake-downstream side of the blow-by gas sucking pipe ( 18 ).