Air vent apparatus for auxillary fuel tank in power unit

Details Air vent apparatus for auxillary fuel tank in power unit Air vent apparatus for auxillary fuel tank in power unit

B - Operations, Transporting

60

K

B60K 15/035 (2006.01) F02B 27/00 (2006.01) F02B 61/04 (2006.01) F02B 75/20 (2006.01) F02M 35/12 (2006.01) F02M 35/16 (2006.01) F02M 37/10 (2006.01) F02M 37/18 (2006.01) F02M 37/20 (2006.01) F02B 75/02 (2006.01) F02B 75/18 (2006.01)

Patent

CA 2246912

In a power unit such as an outboard motor is provided in which an engine and an auxiliary fuel tank which temporarily stores fuel to be supplied to a fuel injection valve of the engine and to which extra fuel is returned fromthe injection valve, are housed in an engine room which is defined by a mount case and an engine cover, the upper ends of air vent pipes extend from the auxiliary fuel tank and communicate with an opening portion which opens in an upper outside surface of the engine cover. Fuel vapor occurring in the auxiliary fuel tank, is discharged from the opening portion. Accordingly,the fuel vapor occurring in the auxiliary fuel tank in the power unit is prevented from being sucked into the engine, and the degradation of the exhaust characteristics of the engine can be avoided.

L'invention porte sur un dispositif d'évacuation des vapeurs de carburant d'un réservoir auxiliaire d'un groupe de propulsion, tel un hors-bord, équipé d'un boîtier à moteur comprenant un support de moteur et un capot de moteur reliés l'un à l'autre, ce boîtier renfermant un moteur monté sur le support et un réservoir auxiliaire destiné à emmagasiner provisoirement du carburant en vue d'alimenter un injecteur et à recevoir le carburant excédentaire que lui renvoie l'injecteur. La tuyauterie d'évacuation des vapeurs part du réservoir auxiliaire et communique avec une chambre à ouverture donnant sur la surface extérieure supérieure du capot du moteur. Les vapeurs de carburant qui se forment dans le réservoir auxiliaire sont évacuées par l'ouverture, ce qui les empêche d'être aspirées par le moteur et de rendre ainsi les gaz d'échappement plus polluants.

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