A VARIABLE-DISPLACEMENT LUBRICANT PUMP

摘要

The invention refers to a variable-displacement lubricant pump (10) for providing pressurized lubricant for an interna! combustion engine (70), comprising a rotor (14) with radially sfidable vanes (15) rotating in a sh?ftabie stator ring (13) whereby the stator ring (13) being pushed by a first plunger (21) pushing the stator ring (13) into high pumping volume direction, A pressure control system for controlling the lubricant discharge pressure of the pressurized lubricant ?s provided the control system comprising a first control chamber (22) wherein the first plunger (21) is provided being ax?af iy movable and a first pressure conduit (28a) connecting a pump outlet port (25) with the first control chamber (22). A movable outlet opening (42) in a side wail (52) of the first control chamber (22) is provided the outlet opening (42) being movable with an axial projection and being connected to a low pressure. The movable outlet opening (42) and the first plunger (21) are arranged so that the first plunger (21) covers and thereby closes the movable outlet opening (42) depending on the first plunger position and the outlet opening position, and the movable outlet opening (42) being actuated by a thermostatic element (54) affected by the temperature of the lubricant.