Variable displacement pump with double eccentric ring and displacement regulation method

摘要

A rotary positive displacement pump for fluids, in particular for the lubrication oil of a motor vehicle engine (60), has a displacement that can be regulated by the rotation of a stator ring (112) having an eccentric cavity (113) in which the rotor (15) of the pump (1) rotates. The stator ring (112) is located in an eccentric cavity (13) of an external ring (12), which is configured as a multistage rotary piston for displacement regulation and is arranged to be directly driven by a fluid under pressure, in particular oil taken from a delivery side (19) of the pump or from a point of the lubrication circuit located downstream of the oil filter (62). A method of regulating the displacement of the pump (1) and a lubrication system for the engine of a motor vehicle in which the pump (1) is used.

主权项

1. A variable displacement rotary positive displacement pump for fluids, comprising a rotor arranged to rotate within an eccentric cavity of a stator ring in turn arranged to be rotated within a first predetermined angular interval, as operating conditions of the pump vary, in order to vary a relative eccentricity between the eccentric cavity and the rotor and hence the displacement of the pump, wherein the stator ring is housed within an eccentric cavity of an external ring, which is configured as a multistage rotary piston arranged to be directly driven by a fluid under pressure in order to be rotated within a second predetermined angular interval, and arranged to transmit the rotary motion to the stator ring in order to make it rotate in opposite direction to the external ring.