Wax type thermostat for the cooling system of an internal combustion engine

A cooling system for an internal combustion engine provided with a radiator, a coolant loop circuit linking the radiator to the internal combustion engine, and a by-pass conduit, and a wax-type thermostat, said thermostat comprising:

• a thermostat body with one inlet from the radiator, one inlet from the internal combustion engine via said by-pass conduit, and one outlet to the internal combustion engine;
• a closure element, integral to a first piston, that is movable from a closing position of a thermostat internal pathway running from said inlet from the radiator to said outlet to the internal combustion engine, to an opening position thereof, and vice-versa;
• a main wax chamber in thermal connection to the coolant within the thermostat body;
• a spring to return the closure element towards its closing position;
• first means for moving the first piston when a volume variation in the wax contained into the main wax chamber occurs;
• an auxiliary wax chamber with second means for moving said first piston when a volume variation in the wax contained in the auxiliary wax chamber occurs;
• and
• heating means in thermal connection to said auxiliary wax chamber.

A power-train system including an internal combustion engine and a cooling system for the internal combustion engine, wherein the cooling system comprises a radiator, a coolant loop circuit linking the radiator to the internal combustion engine, a by-pass conduit, and a wax-type thermostat, said thermostat comprising:

• a thermostat body with one inlet from the radiator, one inlet from the internal combustion engine via said by-pass conduit, and one outlet to the internal combustion engine;
• a closure element, integral to a first piston, that is movable from a closing position of a thermostat internal pathway running from said inlet from the radiator to said outlet to the internal combustion engine, to an opening position thereof, and vice-versa;
• a main wax chamber in thermal connection to the coolant within the thermostat body;
• a spring to return the closure element towards its closing position;
• first means for moving the first piston when a volume variation in the wax contained into the main wax chamber occurs;
• an auxiliary wax chamber with second means for moving said first piston when a volume variation in the wax contained in the auxiliary wax chamber occurs;
• and
• heating means in thermal connection to said auxiliary wax chamber.