Fluid pressure cylinder
AssigneeSMC Corporation
InventorTakafumi AKITA
Life of this patent
Estimating the term…
Abstract
Cushion holes are provided in cover members, tubular cushion rings are provided on a piston and a piston rod so as to be insertable into and withdrawable from the cushion holes as the piston moves, cushion packings capable of slidably contacting the outer circumference of the cushion rings are mounted to be movable in an axial direction, in mounting grooves formed on inner walls of the cover members constituting the cushion holes, the cushion packings each include a plurality of protrusions extending from the outer circumferential surface to the side surface near the piston and disposed circumferentially alongside one another, and cushioning grooves that extend in parallel with the axis of the cushion rings and whose cross-sectional area changes are formed on the outer circumferential surface of the cushion rings.
Claims10
A fluid pressure cylinder comprising a cylinder tube, and a cover member fixed to an end of the cylinder tube, the fluid pressure cylinder including a pressure chamber formed between a piston and the cover member, wherein:
- a port configured to supply and discharge a pressure fluid to and from the pressure chamber, and a cushion hole configured to connect the pressure chamber and the port are provided in the cover member;
- a tubular cushion ring is attached to the piston or a piston rod so as to be insertable into and withdrawable from the cushion hole as the piston moves;
- a cushion packing having an annular shape and configured to slidably contact an outer circumference of the cushion ring is mounted in a mounting groove formed on an inner wall of the cover member constituting the cushion hole, the cushion packing being configured to be movable in an axial direction;
- the cushion packing includes a plurality of protrusions extending from an outer circumferential surface of the cushion packing to a side surface thereof near the piston, and disposed alongside one another in a circumferential direction;
- and
- a cushioning groove extending in a direction parallel to an axis of the cushion ring and having a cross-sectional area that changes is formed on an outer circumferential surface of the cushion ring.
Dependencies are inferred from the claim text.