Transfer pump for high-pressure gasoline injection
AssigneeContinental Automotive Asnieres France
InventorsFlorent Sellas, Dominique Veret
Life of this patent
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Abstract
Transfer pump for high-pressure petrol injection of the type including a piston (1) which delivers oil into a deformable element such as a bellows (8), the deformations of the bellows (8) in a cylindrical chamber (6) filled with fuel causing a pumping effect whereby the fuel is pumped towards a rail (40) supplying high-pressure injectors, wherein elements are arranged for diverting some or all of the oil pumped by the piston (1) towards a chamber (15) without pressuring it so as to determine at will the useful stroke of the piston (1) and hence the quantity of fuel pumped at high pressure towards the rail (40).
Claims10
Transfer pump for high-pressure gasoline injection, characterized by the fact that it comprises a piston (1) that moves in an alternative manner into a bore (4) that is provided in a cylinder (5) that is itself placed in a fuel-filled cylindrical chamber (6), whereby said cylinder (5) is surrounded by a bellows (8) whose internal chamber (11) communicates, on the one hand, with the bore (4) via an opening (10), and, on the other hand, with an oil reserve (15) by means of a duct (16) that is equipped with a solenoid valve (17);
- whereby the back-and-forth movements of the piston (1) cause the extending and the shortening of said bellows (8), itself integral with a plate (12) that, by its movements, draws in and conveys the fuel;
- whereby the oil that is pumped by the piston (1) can be diverted completely or partially by means of the solenoid valve (17) to the oil reserve (15) without being pressurized, which determines as desired the useful travel of said piston (1) and therefore the amount of fuel pumped at high pressure toward a rail (40).
Dependencies are inferred from the claim text.