Abstract: An object of the present invention is to provide a cooling device which solves various problems such as the economical efficiency, pulsation of cold air, etc. In a cooling device of the present invention, the compressor and the expander are coupled to one crank shaft or interlocked crank shafts so as to use the expansion energy from the compressed air in the expander as an energy for compressing the outside air in the compressor, thereby reducing the running cost. Moreover, a plurality of expanders are operated with a predetermined phase difference with respect to one another so as to reduce the pulsation of the cold air. Furthermore, an air dryer is provided along a pipe for introducing air into the expander so as to dehumidify the air before expansion. Moreover, the crank device for the compressor and the expander is preferably provided with a planetary gear mechanism.

Abstract: A crank device performs power conversion between reciprocal movement and rotational movement using a planetary gear mechanism without causing inclination of a connecting rod. An internally toothed sun gear is spaced a predetermined distance from the connecting rod. A planetary gear as well as a planetary gear shaft secured at one end of the planetary gear are rotatably received within a crank member. An arm portion is formed on the other end of the planetary gear shaft and extends radially outwardly a distance corresponding to the radius of the pitch circle of the planetary gear. One end of the connecting rod is pivotably connected to the forward end of the arm portion. A pair of bearings rotatably support the opposite ends of the planetary gear shaft and are disposed at spaced positions within the crank member. One of the bearings is arranged adjacent to the connecting rod.

Abstract: The invention is intended to connect a various kinds of movable bodies capable of reciprocating in linear fashion, such as a piston of a compressor, directly to a piston of an internal combustion engine, for effecting efficient power transmission.A cylinder 4a of an internal combustion engine E and a cylinder 4b of a compressor C are arranged in alignment with each other along a rectilinear line. An internal sun gear 8a is fixedly arranged, which has a center O at a position intermediate the internal combustion engine E and the compressor C on the rectilinear line. A planetary gear 10 is arranged, which is meshed with the internal sun gear 8a for rotation about its center and for revolution around the center O. The planetary gear 10 has a pitch circle diameter half that of the internal sun gear 8a. A crank member 14 is arranged, which includes a shank 14a rotatable about the center O. The planetary gear 10 is rotatably supported, at its center, by the tip of the arm 14b of the crank member 14.