Variable-displacement lubricant vane pump

A variable-displacement lubricant pump for providing a pressurized lubricant for an internal combustion engine, the variable-displacement lubricant pump comprising:

• a first plunger configured to be radially movable;
• a control ring configured to be radially shiftable and to be pushed by the first plunger in a high pumping volume direction;
• a rotor comprising radially slidable vanes which are configured to rotate in the control ring;
• a first control chamber comprising a side wall, the first plunger being arranged in the first control chamber;
• a pump outlet port;
• a first pressure conduit configured to connect the pump outlet port with the first control chamber;
• a pumping volume limitation unit comprising:
• an outlet opening arranged in the side wall of the first control chamber, the outlet opening and the first plunger being arranged so that the first plunger covers and closes the outlet opening in a lower pumping volume position of the control ring;
• a thermostatic element;
• and
• a temperature controlled valve configured to be actuated by the thermostatic element based on a lubricant temperature;
• wherein the outlet opening is connected to an atmospheric pressure when the temperature controlled valve is actuated by the thermostatic element;
• a shiftable valve body;
• and
• a retraction spring;
• wherein the thermostatic element is configured to push the shiftable valve body against a force of the retraction spring to an extended closed end position when the lubricant has an operation temperature,
• the shiftable valve body is in a retracted closed end position at a cold lubricant temperature, and
• the shiftable valve body is in an intermediate open position at an intermediate lubricant temperature.