Abstract: A variable lubricant vane pump which provides a pressurized lubricant for an engine includes a pump housing comprising a pump chamber. The pump chamber comprises pump compartments which rotate from a charge zone to a discharge zone. The pressurized lubricant is discharged from the pump compartments into an outlet cavity. A control ring envelopes the pump chamber and shifts between high and a low pumping volume position. A pump rotor comprises radially slidable vanes which rotate in the control ring. A pressure control chamber pushes the control ring into the high pumping volume direction. A control valve connects or disconnects the pressure control chamber to a lubricant tank. A pilot chamber pushes the control ring into the low pumping volume direction. A pilot chamber channel connects the outlet cavity with the pilot chamber. A control chamber channel connects the outlet cavity with the pressure control chamber.

Abstract: A variable displacement lubricant pump for providing a pressurized lubricant for an internal combustion engine includes a shiftable control ring, a hydraulic control chamber which directly actuates the control ring, a pump rotor comprising a plurality of slidable vanes which rotate in the control ring, a control chamber wall, a temperature control opening arranged in the control chamber wall, and a temperature control valve which connects or disconnects the temperature control opening to an atmospheric pressure. The temperature control valve comprises a valve plunger which is axially shiftable so as to block or leave open a lubricant passage, and a first bimetal actuator sheet which directly actuates the valve plunger. The first bimetal actuator sheet comprises a first switching temperature. The valve plunger is in an open position if a lubricant temperature exceeds the first switching temperature.

Abstract: A variable displacement lubricant pump for providing a pressurized lubricant for an internal combustion engine includes a control ring configured to be shiftable, a pump rotor comprising a plurality of slidable vanes which are configured to rotate in the control ring, a hydraulic control chamber configured to directly actuate the control ring, a valve bore, and a temperature control valve configured to connect or disconnect the temperature control opening to an atmospheric pressure. The hydraulic control chamber comprises a side wall comprising a temperature control opening arranged therein. The temperature control valve comprises a switching strip which comprises a switching temperature. The switching strip is configured to be in an open position if a temperature is below the switching temperature, and to be in a closed position if the temperature is above the switching temperature so as to close the valve bore.

Abstract: A variable displacement lubricant pump for providing a pressurized lubricant for an internal combustion engine. The variable displacement lubricant pump includes a shiftable control ring, a pump rotor comprising a plurality of slidable vanes which rotate in the control ring, a hydraulic pressure control comprising a control chamber which comprises a lateral control chamber wall, and a control ring plunger shiftable along the lateral control chamber wall, a first eccentricity limiting opening arranged in the lateral control chamber wall, a second eccentricity limiting opening arranged in the lateral control chamber wall, and an eccentricity limiting control system which connects or disconnects the first eccentricity limiting opening and the second eccentricity limiting opening to atmospheric pressure dependent on a lubricant temperature. The hydraulic pressure control directly actuates and controls an eccentricity of the control ring.

Abstract: A variable lubricant vane pump which provides a pressurized lubricant for an engine includes a pump housing comprising a pump chamber. The pump chamber comprises pump compartments which rotate from a charge zone to a discharge zone. The pressurized lubricant is discharged from the pump compartments into an outlet cavity. A control ring envelopes the pump chamber and shifts between high and a low pumping volume position. A pump rotor comprises radially slidable vanes which rotate in the control ring. A pressure control chamber pushes the control ring into the high pumping volume direction. A control valve connects or disconnects the pressure control chamber to a lubricant tank. A pilot chamber pushes the control ring into the low pumping volume direction. A pilot chamber channel connects the outlet cavity with the pilot chamber. A control chamber channel connects the outlet cavity with the pressure control chamber.

Abstract: A variable displacement lubricant pump for providing a pressurized lubricant for an internal combustion engine includes a shiftable control ring, a hydraulic control chamber which directly actuates the control ring, a pump rotor comprising a plurality of slidable vanes which rotate in the control ring, a control chamber wall, a temperature control opening arranged in the control chamber wall, and a temperature control valve which connects or disconnects the temperature control opening to an atmospheric pressure. The temperature control valve comprises a valve plunger which is axially shiftable so as to block or leave open a lubricant passage, and a first bimetal actuator sheet which directly actuates the valve plunger. The first bimetal actuator sheet comprises a first switching temperature. The valve plunger is in an open position if a lubricant temperature exceeds the first switching temperature.

Abstract: A variable displacement lubricant pump for providing a pressurized lubricant for an internal combustion engine includes a control ring configured to be shiftable, a pump rotor comprising a plurality of slidable vanes which are configured to rotate in the control ring, a hydraulic control chamber configured to directly actuate the control ring, a valve bore, and a temperature control valve configured to connect or disconnect the temperature control opening to an atmospheric pressure. The hydraulic control chamber comprises a side wall comprising a temperature control opening arranged therein. The temperature control valve comprises a switching strip which comprises a switching temperature. The switching strip is configured to be in an open position if a temperature is below the switching temperature, and to be in a closed position if the temperature is above the switching temperature so as to close the valve bore.

Abstract: A pumping system having a pump, such as a variable-displacement vane pump or a gear pump. The pump in turn has hydraulic pressure-control dissipating devices for imparting to the oil in a first control chamber a pressure lower than the pressure of a second chamber. The system is characterized in that the first control chamber of the pump has a channel connecting the first control chamber to an oil inlet. And the channel has an opening/closing device controlled selectively by an engine operating parameter, such as oil temperature.

Abstract: A variable-eccentricity vane pump having a rotor fitted with blades; an adjusting ring housing the rotor; elastic means for forcing the adjusting ring into a maximum-eccentricity position with respect to the rotor; a first sliding member connected to the adjusting ring and which slides in fluidtight manner inside a first chamber connected hydraulically to a delivery conduit of the pump; and a second sliding member connected to the adjusting ring and which slides in fluidtight manner inside a second chamber connected hydraulically to a delivery conduit of the pump. The first sliding member is connected to the adjusting ring on the opposite side to the elastic means and the second sliding member; and the second chamber is smaller than the first chamber, and has a drain opening formed in a lateral wall on which the second sliding member slides.

Abstract: A variable-eccentricity vane pump (1) having a rotor (5) fitted with blades; an adjusting ring (4) housing the rotor (5); elastic means (6) for forcing the adjusting ring (4) into a maximum-eccentricity position with respect to the rotor (5); a first sliding member (12) connected to the adjusting ring (4) and which slides in fluidtight manner inside a first chamber (9) connected hydraulically to a delivery conduit of the pump; and a second sliding member (13) connected to the adjusting ring (4) and which slides in fluidtight manner inside a second chamber (10) connected hydraulically to a delivery conduit of the pump. The first sliding member (12) is connected to the adjusting ring (4) on the opposite side to the elastic means (6) and the second sliding member (13); and the second chamber (10) is smaller than the first chamber (9), and has a drain opening (11) formed in a lateral wall (10a) on which the second sliding member (13) slides.

Abstract: A pumping system (100*) having a pump (10*), such as a variable-displacement vane pump (10*) or a gear pump. The pump (10*) in turn has hydraulic pressure-control dissipating devices (29, 30) for imparting to the oil in a first control chamber (22) a pressure (p2) lower than the pressure of a second chamber (20). The system (100*) is characterized in that the first control chamber (22) of the pump (10*) has a channel (40) connecting the first control chamber to an oil inlet (23). And the channel (40) has an opening/closing device (41) controlled selectively by an engine operating parameter, such as oil temperature.