Nippon Thermostat Co., Ltd.

Hitoshi Komatsu

Tetsuya Nishimura

In a fuel cell cooling device, sliding damage to a piston and the deterioration of sealing performance are prevented despite using a simple structure in which a portion sliding with the piston is made of a brass bushing and a simple and inexpensive method of setting the assembly of the brass bushing to a press-fitted state by light press-fitting and ball burnishing. Provided is a stainless steel cylindrical guide slidably retaining a stainless steel piston, advancing and retracting according to the expansion and contraction of the thermal expansion body, provided at the open end of a bottomed cylindrical case containing a thermal expansion body. A brass bushing is fitted into the inner circumferential portion of the cylindrical guide by light press-fitting and subjected to precision finishing on the inner circumferential surface, for example, by ball burnishing, to be expanded radially by the pressure from the inside and press-fitted.

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Kiyose, Japan

Hitoshi Komatsu