Wax-type thermostat with wax overheating safety means

A cooling system for an internal combustion engine comprising:

• a radiator;
• a coolant loop circuit linking the radiator to the internal combustion engine, and having a by-pass conduit, as well as a wax-type thermostat, the thermostat including:
• a thermostat body with a radiator inlet for feeding the coolant from the radiator, an internal combustion engine inlet, for feeding the coolant from said by-pass conduit, and an internal combustion engine outlet for feeding the coolant towards the internal combustion engine;
• a piston integral to a closure element that is movable between a closing position and an opening position of a thermostat internal pathway connecting said radiator inlet to said internal combustion engine outlet;
• a wax chamber in thermal connection to the coolant within the thermostat body;
• a first spring, with spring constant K, to return the closure element towards its closing position;
• and
• wherein the thermostat also comprises a movable body that moves from a position protruding into said wax chamber and a position retracted from said wax chamber within a relevant seat, and a second spring with spring constant Kp that biases said movable body towards said position protruding into the wax chamber.

A power-train system comprising:

• an internal combustion engine;
• a cooling system for the internal combustion engine has a radiator, a coolant loop circuit linking the radiator to the internal combustion engine and having a by-pass conduit, as well as a wax-type thermostat, the thermostat including:
• a thermostat body with a radiator inlet for feeding the coolant from the radiator, an internal combustion engine inlet, for feeding the coolant from said by-pass conduit, and an internal combustion engine outlet for feeding the coolant towards the internal combustion engine;
• a piston integral to a closure element that is movable between a closing position and an opening position of a thermostat internal pathway connecting said radiator inlet to said internal combustion engine outlet;
• a wax chamber in thermal connection to the coolant within the thermostat body, the wax chamber placed within the piston;
• at least one tubular element protruding within the wax chamber, the piston being slidable relative to said at least one tubular element;
• a first spring, with spring constant K, to return the closure element towards its closing position;
• and
• wherein the thermostat also comprises a movable body that moves from a position protruding into said wax chamber and a position retracted from said wax chamber within a relevant seat, and a second spring with spring constant Kp that biases said movable body towards said position protruding into the wax chamber.