| 摘要 |
Provided is a thermostat device enabling stable valve element operation and capable of preventing overshoots and hunting, and which enables the miniaturization of the thermostat device itself. Inside the housing of a bottom bypass-type thermostat device comprising a main valve element on the main body and a bypass valve element on the bottom side, the main valve element and bypass valve element are supported by a main shaft supported at the piston tip of a thermoelement, the temperature sensor of the thermoelement is disposed on the main shaft such that it does not directly contact the cooling water from the radiator outlet and senses the temperature by contacting a portion of the cooling water from the engine outlet, and the temperature sensor is equipped with a heating element. A bypass flow channel for bypassing the circulating fluid is formed at the downstream side of the valve element that enables control the opening/closing of the main valve element and bypass valve element according to the cooling water temperature and of opening/closing of the valve element by application of the heating element.
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