Importance

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Abstract

An object of the present invention is to provide a thermostat device which enables a valve body to operate with stability, which can prevent overshoot and hunting, and in which the size of the thermostat device itself can be reduced. A first valve body and a second valve body are removably supported on a main shaft which is supported by the distal end of a piston of a thermo-element which causes the first valve body and second valve body to open and close by sensing the temperature of cooling water, and a temperature sensing section of said thermo-element is disposed so as to sense cooling water temperature by contacting only the cooling water from the engine outlet side without directly contacting the cooling water from the radiator outlet side. A heat-generating element is attached to the temperature sensing section, and thus in addition to the opening and closing of the first valve body and second valve body by the thermo-element in accordance with the temperature of the cooling water, [the opening and closing of the first and second valve bodies are freely controlled by the application of a current to the heat-generating element.sup.vi ]. The device is constituted such that a third influx sleeve is disposed below the second valve body, the first valve body is disposed above the second valve body, the thermo-element is disposed above the first valve body, and the first influx sleeve is provided between the thermo-element and the main valve.

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First Claim