VARIABLE DISPLACEMENT PUMP WITH ELECTRIC CONTROL OF DISPLACEMENT REGULATION AND METHOD OF REGULATING PUMP DISPLACEMENT

摘要

A rotary positive displacement pump for fluids, in particular, for the lubrication of a motor vehicle engine (61), has a displacement that can be regulated through the rotation of a stator ring (42) having an eccentric cavity (43) in which the rotor (15) of the pump (1) rotates. The stator ring (42) is housed within an in eccentric cavity (13) of an external ring (12). A rotor actuator (50), controlled by the electronic control unit of the motor vehicle, causes a synchronous rotation by an equal amount in opposite directions of both rings. A method of regulating the displacement of the pump (1) and lubrication system for a motor vehicle engine in which the pump is used are also provided.

主权项

1. A variable displacement rotary positive displacement pump for fluids, comprising a rotor (15; 115) arranged to rotate within an eccentric cavity (43; 143) of a stator ring (42; 142) in turn arranged to be rotated within a predetermined angular interval, as operating conditions of the pump (1; 101) vary and upon command of a system (62, 63) detecting such conditions, in order to vary a relative eccentricity between the eccentric cavity (43; 143) and the rotor (15; 115) and hence the pump displacement, the pump (1; 101) further including an electromagnetic actuator (50), integrated into or coupled with the pump, which is driven by said detecting system (62, 63) and is arranged to generate a rotary motion and to transmit it to said stator ring (42; 142) through a toothed wheel (53; 153);
the pump being characterised in that:
said toothed wheel (53; 153) is located at least in part in a stator cavity (11a, 11b; 111) located in a peripheral position relative to said stator ring (42; 142); and in that
a toothed sector (52; 152) is located at the base of said peripheral stator cavity (11a, 11b; 111).