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A wave cam 17 is rotatably supported by a drive shaft 13 in cylinder blocks 11, 12. Front and rear cam surfaces 17A, 17B of the wave cam 17 are defined by the surface of a predetermined imaginary cylindroid. Semi-spherical shoes 18, 19 are interposed between each cam surface 17A, 17B and each double

A wave cam 17 is rotatably supported by a drive shaft 13 in cylinder blocks 11, 12. Front and rear cam surfaces 17A, 17B of the wave cam 17 are defined by the surface of a predetermined imaginary cylindroid. Semi-spherical shoes 18, 19 are interposed between each cam surface 17A, 17B and each double-headed piston 16, which is accommodated in each cylinder bore 11a, 12a. Each shoe 18, 19 has a spherical surface 18a, 19a and a flat surface 18b, 19b. An imaginary circumference C0 corresponding to the arrangement of centers Q1, Q2 of the spherical surfaces 18a, 19a of the shoes 18, 19, respectively, is defined on each cam surface 17A, 17B. An imaginary circumference C1 corresponding to the arrangement of axes L1 of each cylinder bore 11a, 12a is also defined on each cam surface 17A, 17B. The center of both circumferences C0, C1 coincide with an axis L0 of the drive shaft 13. The radius R1 of the circumference C0 is larger than the radius of the circumference C1. Integral rotation of the drive shaft 13 and the wave cam 17 reciprocates each piston 16 in the cylinder bores 11a, 12a via the shoes. The centers Q1, Q2 of each spherical surface orbits outside of the circumference C1 on the associated cam surface 17A, 17B.

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A wave cam type compressor comprising a wave cam body mounted on a drive shaft for integral rotation with the drive shaft, a piston disposed within a cylinder bore and coupled to the cam body, said cam body having a non-planar cam surface for driving the piston, and a shoe interposed between the cam

A wave cam type compressor comprising a wave cam body mounted on a drive shaft for integral rotation with the drive shaft, a piston disposed within a cylinder bore and coupled to the cam body, said cam body having a non-planar cam surface for driving the piston, and a shoe interposed between the cam surface and the piston to follow a predetermined orbital path on the cam surface, whereby rotation of the drive shaft is converted into reciprocating movement of the piston with a predetermined piston stroke between a top dead center and a bottom dead center in said cylinder bore to compress fluid supplied to the cylinder bore, said compressor being characterized in that: said shoe has a spherical surface, and said drive shaft is located with its longitudinal axis spaced at a greater distance from the center of curvature of said spherical surface than from the longitudinal axis of said cylinder bore.