PUMP COMPRISING AN ADJUSTING DEVICE AND A CONTROL VALVE FOR ADJUSTING THE DELIVERY VOLUME OF THE PUMP

摘要

A pump including a port connecting a suction of the pump to a reservoir of a fluid; region an adjusting device for adjusting the delivery volume of the pump; a control valve, including a relief port, a control piston, and a tensing device which acts on the control piston; and an additional control device for generating a control force which acts on the control piston, counter to the tensing device, wherein the relief port is connected to the suction region by bypassing the reservoir.

主权项

1. A pump which exhibits an adjustable delivery volume, the pump comprising:
(a) a pump housing, comprising: a pump port for connecting the pump to a reservoir of a fluid to be delivered; a delivery chamber which comprises a delivery chamber inlet on a low-pressure side of the pump, and a delivery chamber outlet on a high-pressure side of the pump, for a fluid; and a suction region extending from the pump port up to at least the delivery chamber inlet (6) on the low-pressure side; (b) a delivery rotor a which can be moved within the delivery chamber for delivering the fluid from the low-pressure side to the high-pressure side, the delivery rotor rotatable about a rotational axis within the delivery chamber; (c) an adjusting device for adjusting the delivery volume of the pump; (d) a control valve, arranged outside the suction region, comprising:
(d1) a pressure port for a setting fluid which is diverted from the fluid of the high-pressure side;(d2) a working port for the setting fluid, which is connected to the adjusting device;(d3) a relief port for the setting fluid;(d4) valve space, and a control piston moveable back and forth within the valve space between a first piston position and a second piston position;(d5) and a tensing device for generating a tensing force which acts on the control piston in the direction of one of the piston positions; (e) and an additional control device for generating a control force which acts on the control piston (32), counter to the tensing force of the tensing device, (f) wherein the control valve
(f1) connects the working port to the pressure port when the control piston is in the first piston position and(f2) separates the working port from the pressure port and connects the working port to the relief port when the control piston is in the second piston position, (g) and wherein the relief port is connected to the suction region by bypassing the reservoir.