Patent ID: 8025488
Filing Date: 2011-09-27
Classification: F04B

Abstract:
1. 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 ).