| 摘要 |
[Problem] To add the functionality of a bypass passage, bypass valve, or the like to a thermostat device that controls the flow of engine cooling water, and to enable the overall structure to be simplified, the ease of assembly to be improved, and the cost to be reduced. [Solution] A thermostat device equipped with: a main valve (14) that controls the flow of cooling water between first and second passages (13, 12) provided in the cooling water circuit of an automobile engine (1); and a thermo element (15) that is provided in the first passage, and that controls the driving of the main valve in accordance with the cooling water temperature. A device body (1A) in which the thermostat device (10) is incorporated is equipped with a third passage (20). In addition, a second valve body (32), which opens/closes a connecting hole connecting the first passage and the third passage when the pressure of the cooling water in the engine cooling water circuit exceeds a prescribed pressure, is integrally incorporated with a device frame (30) that holds the thermo element. |
