Variable displacement lubricant pump

摘要

A variable displacement lubricant pump includes a first plunger which pushes a shiftable control ring into a high pumping volume direction. A pump rotor comprises radially slidable vanes which rotate in the control ring. A pressure control system comprises a first pressure control chamber wherein a first plunger is axially moveable. A first pressure conduit connects a pump outlet port with the first pressure control chamber. A first pressure control valve controls a pressure in the first pressure control chamber. A second pressure control valve between an outlet opening in a side wall of the first pressure control chamber and a low pressure source controls the outlet opening and is a centrifugal valve mechanically connected with the pump rotor which closes at a high rotational speed of the pump rotor. The outlet opening is closed by the first plunger in a low pumping volume position and opened in a high pumping volume position.

主权项

1. A variable displacement lubricant pump for providing a pressurized lubricant for an internal combustion engine, the variable displacement lubricant pump comprising:
a control ring which is configured to be shiftable; a first plunger which is configured to push the control ring into a high pumping volume direction; a pump rotor comprising radially slidable vanes which are configured to rotate in the control ring; a pressure control system configured to control a discharge pressure of the pressurized lubricant, the pressure control system comprising a first pressure control chamber wherein the first plunger is arranged to be axially moveable; a pump outlet port; a first pressure conduit configured to connect the pump outlet port with the first pressure control chamber; a first pressure control valve configured to control a pressure in the first pressure control chamber; an outlet opening disposed in a side wall of the first pressure control chamber; and a second pressure control valve disposed between the outlet opening and a low pressure source, the second pressure control valve being configured to control the outlet opening, wherein, the second pressure control valve is a centrifugal valve which is mechanically connected with the pump rotor and is configured to close at a high rotational speed of the pump rotor, and the outlet opening is configured to be closed by the first plunger in a low pumping volume position and to be opened in a high pumping volume position.