| 摘要 |
A piston for a gas-operated linear actuator wherein a double-acting piston moves axially within a cylinder in response to gas pressure applied intermittently to chambers on either side of the piston. The piston has reservoirs in the form of holes in each of its faces and a pair of spaced-apart circumferential grooves, one communicating with the holes in one piston face and the other with the holes in the other piston face, the two sets of grooves and holes being kept out of communcation with one another. Gas under pressure introduced into one chamber forces the piston to move toward the opposite chamber, and a portion of the gas passes into the holes and out through the adjacent groove, providing a stream of gas between piston and cylinder walls, producing a gas-bearing effect. Upon completion of a piston stroke in one direction by this means, pressurized gas is introduced into the opposite chamber, moving the piston in the opposite direction and providing a flow of a portion of the gas through the other set of holes and grooves, again providing a gas-bearing effect between piston and cylinder walls. This structure avoids any requirement for placement of rings around the piston wall.
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