An exhaust valve device for a fuel tank allows gas to smoothly circulate without increasing the device in size. The exhaust valve device for a fuel tank includes casings partitioning an inside into an upper chamber and a lower chamber by a bulkhead including a through hole; and a float valve. A portion defining the upper chamber of the casing includes a cylinder portion in which an exhaust port is formed, and a circular plate closing an upper end of the cylinder portion. A cylinder body is provided around an upper chamber side of a communication hole, and a first ventilation hole is formed in a side wall on a side opposing an exhaust port side of the cylinder body. At a boundary portion between an inner circumferential face of the cylinder portion and a lower face of the circular plate, a corner portion having a curved surface shape smoothly connecting between the inner circumferential face of the cylinder portion and the lower face of the circular plate is extended. A curvature of the corner portion is the smallest on a side opposing a side forming an exhaust hole, and gradually increases as moving toward the side forming the exhaust hole in a circumferential direction.
EXHAUST VALVE DEVICE FOR FUEL TANK
ABGASVENTILVORRICHTUNG FÜR EINEN BRENNSTOFFTANK
DISPOSITIF DE SOUPAPE D'ÉCHAPPEMENT DESTINÉ À UN RÉSERVOIR DE CARBURANT
2016-12-07
Patent
Electronic Resource
English
IPC: | B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / F02M Zuführen von Brennstoff-Luft-Gemischen oder deren Bestandteilen bei Brennkraftmaschinen allgemein , SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF / F16K VALVES , Ventile |