Abstract: A gas compressor has a cup-like casing. A driving shaft is rotatably carried by a bottom of the casing and has a rotary plate secured thereto. A driven shaft is disposed in the casing at an inclination angle of 20.degree. against the driving shaft, supported by a bearing provided on an end of the driving shaft, and driven by the driving shaft. A cylinder block is fixed to the driven shaft and has a cylinder bores receiving pistons coupled with the rotary plate so that the pistons reciprocate in the cylinder bores upon rotation of the driving shaft. A side plate is secured to an open end of said casing and has a bore receiving a bearing for supporting one end of the driven shaft. The bore is formed in the inside the side plate which projects outside, so that a distance between the bearing of the driving shaft and the bearing in the bore is extended and stable.

Abstract: A ball support structure comprises a ball and a ball support movably holding the ball. The ball support is formed with a ball receiving recess defined by a semispherical portion and a cylindrical portion. A through hole aligning with the ball receiving recess and passing through the ball support is formed. The ball is disposed in the ball receiving recess of the ball support and then the ball support is axially pressed at the peripheral of the ball receiving recess so that metal of part of the ball support flows to contact with the ball thereby to provide a partially spherical portion. The ball is pushed by a rod through the through hole when the partially spherical portion is formed, so that the ball and the semispherical portion has a small gap.