| 摘要 |
PURPOSE: To provide effective thermal contact between an electric element and an exposed end surface of a piston, by causing the piston to be pushed against the action of a spring device combined with the piston, extruding a grease-like medium to the exposed end surface of the piston, and causing the grease-like medium to flow between the exposed end surface and the electric element. CONSTITUTION: An exposed end surface 9 of a piston 4 of each thermal conduction module 26 thermally contacts associated electric elements 21, 22 from which heat is removed. The piston 4 protrudes against the action of a coil spring 6, and a grease-like medium 10 exudes from a through-hole 8 opening in the exposed end surface 9 and flows between the exposed end surface and the electric elements 21, 22 so as to realize effective thermal contact between the electric elements and the exposed end surface of the piston. Since the grease- like medium having a high thermal conductivity substantially fills the space between the electric elements 21, 22 and the exposed end surface 9, the efficiency of thermal conduction from the electric elements to the piston under the spring load is improved, and the efficiency of thermal conduction to a thermal conductor 24 via a tubular housing 1 is also high. |
