| 摘要 |
PROBLEM TO BE SOLVED: To hold the selected position of a directional control valve even when a pressure in a pilot pressure chamber is lowered. SOLUTION: This clutch selector valve 49 comprises a housing 49b and a spool valve stem 49s stored in the housing 49b. The spool valve stem can be switched between two positions. A ball storage hole 49p extending from the valve storage hole 49a in the radial direction is formed in the housing 49b, and ball members 56a pushed out toward the valve storage hole 49a by a spring force are stored in the ball storage hole 49p. Also, annular engagement grooves 56c and 56d corresponding to the ball members 56a are formed at the end of the spool valve stem 49s. At one selected position, the selected position can be held by engaging the ball members with the engagement groove 56c, and at the other selected position, the selected position can be held by engaging the ball members 56a with the engagement groove 56d. COPYRIGHT: (C)2005,JPO&NCIPI
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