A VARIABLE-DISPLACEMENT LUBRICANT PUMP

摘要

The present application refers to a variable - displacement lubricant pump (10) comprising a rotor (14) with radially slidable vanes (15) rotating in a shiftable 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 is provided comprising a first control chamber (22) wherein the first plunger (21) is axially movable and a first pressure conduit (28a) connecting a pump outlet port (25) with the first control chamber (22). An outlet opening (42) in a side wail (52) of the first control chamber (22) is provided being movable with an axial projection and 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.