| 摘要 |
PURPOSE:To provide smooth operation for a piston by either forming at least two fluid supply holes in a cylinder case in its symmetrical position on a circumference, or by connecting fluid supply hole to a fluid flow groove formed at the periphery of the cylinder case. CONSTITUTION:Two supply holes 5, 5c are provided on a circumference of a cylinder case 2, and when a fluid is supplied to these supply holes 5, 5c to actuate a piston 1 into rightward motion from the leftmost position, the fluid flows through a gap between this and the side wall of cylinder case to cause maximization of the pressure applied to the piston 1 at places around the supply holes, and when the fluid supply to the supply holes 5, 5c is stopped to put the piston at a standstill in the leftmost position, the pressure distribution will be opposite to the above, but in both cases the pressure applied to the piston 1 is symmetrical to assure free of generation of any moment likely to tilt the piston 1. Also provision of only one supply hole 5 associate with a fluid flow groove 8 at the periphery of the cylinder case 2 will generate the same pressure distribution in the circumferential direction to assure a smooth motion.
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