Patent ID: 8925499
Filing Date: 2015-01-06
Classification: F01P,G05D

Abstract:
1. A wax-type thermostat for the cooling system of an internal combustion engine provided with a radiator and a coolant loop circuit, linking the radiator to the internal combustion engine, and having a by-pass conduit, the thermostat comprising: 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, and vice-versa, 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; at least one tubular element protruding within the wax chamber for moving the piston when a volume variation in the wax contained in the wax chamber occurs; and 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 biasing said movable body towards said position protruding into the wax chamber, wherein said second spring is housed within said at least one tubular element.