Fuel pumping device for two-stroke engines with an...

F - Mech Eng,Light,Heat,Weapons – 02 – M

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Details

F02M 59/10 (2006.01) F02M 37/12 (2006.01) F02M 51/04 (2006.01) F04B 9/125 (2006.01) F04B 9/127 (2006.01) F04B 17/04 (2006.01)

Patent

CA 2262522

A fuel pumping device for two-stroke engines has a housing at least in one part upon which are arranged a pulsed air connection (14) pneumatically connected to the crank housing of the two-stroke engine, a fuel aspirating connection and a fuel feeding connection. A membrane (41) to which pulsed air is applied drives together with a membrane disk (42) a pump piston (22). During the suction hub of the pump at the fuel aspirating connection, fuel which flows out of the tank (1) is sucked through a check valve (61) into the compression chamber (51) located upstream of the pump piston, and during the feeding hub, fuel is pumped through another check valve (71) into the fuel feeding connection and into a reservoir (73) and/or injection valve (5). The pulsed air connection (14) opens into a cavity (13) in the housing located between the membrane (41) and the pump piston (22). At least one spring element (15, 35, 94) acts on each side of the membrane (41). The spring element (15) arranged in the cavity (13) of the housing is supported on the membrane (41) by the separate pump piston (22). In the housing cavity (33) located at the other side of the membrane (41) is arranged an electromagnetic driving unit (90) which supports by means of its armature (91) the compression stroke of the pump piston (22) in synchrony with the compression stroke of the two-stroke engine.

L'invention concerne un dispositif de pompage de carburant pour moteurs deux temps, comportant un carter d'au moins une seule pièce sur lequel sont placés un raccord d'air pulsé (14) raccordé par voie pneumatique au carter de vilebrequin du moteur deux temps, un raccord d'aspiration de carburant et un raccord de refoulement de carburant. Dans ce carter d'une seule pièce, une membrane (41) sollicitée par de l'air pulsé et comportant une bague (42), entraîne un piston de pompe (22). Pendant la course d'aspiration de la pompe, une soupape antiretour (61) aspire le carburant arrivant au niveau du raccord d'admission de carburant, en provenance du réservoir (1) pour l'introduire dans la chambre de compression (51) située en amont du piston de pompe. Pendant la course de refoulement, une autre soupape antiretour (71) introduit le carburant dans le raccord de refoulement de carburant et dans un accumulateur (73), et/ou l'achemine vers une soupape d'injection (5). Le raccord d'air pulsé (14) débouche dans une chambre de carter (13) située entre la membrane (41) et le piston de pompe (22), et au moins un élément ressort (15, 35, 94) agit sur chaque côté de la membrane. L'élément ressort (15) disposé dans la chambre de carter (13) prend appui sur la membrane (41) par l'intermédiaire du piston de pompe (22) séparé. Une unité d'entraînement électromagnétique (90), montée dans la chambre de carter (33) située de l'autre côté de la membrane (41) assiste, par l'intermédiaire de son induit (91), la course de compression du piston de pompe (22) de façon synchronisée avec la course de compression du moteur deux temps.

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