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US 12,188,573 B2Granted
Spool valve
AssigneeEagle Industry Co., Ltd.
InventorsTadanobu Kawato, Naoki Nishimura, Masaki Hoshi
Life of this patent
Estimating the term…
Abstract
A spool valve includes a sleeve having a plurality of ports, and a spool arranged inside the sleeve and having a land formed so as to be brought into sliding contact with inner walls of the sleeve. A depression is formed in the land over an entire circumference.
Claims14
A spool valve, comprising:
- a sleeve having a plurality of ports;
- and a spool arranged inside the sleeve and including a land configured so as to be brought into sliding contact with an inner wall of the sleeve, wherein
- a depression is formed over an entire circumference in at least one of the land and the inner wall of the sleeve with which the land is brought into sliding contact,
- the depression is a plurality of grooves which are arranged to extend in at least two different directions and to partially intersect with each other, a plurality of dimples which are arranged to be isolated from each other, or a plurality of diagonal grooves which are arranged to be inclined with respect to a circumferential direction and to be isolated from each other.
1 more element
Dependencies are inferred from the claim text.