| 摘要 |
PROBLEM TO BE SOLVED: To enhance and stabilize performance by reducing an expansion/contraction amount of a stem spring, to prolong service life, to accomplish miniaturization of the stem spring and the whole parking selector valve device and to perform highly accurate air feeding/discharging control of high pressure air. SOLUTION: The parking selector valve device is provided with a plunger 64 receiving urging force from the stem spring 64S and vertically moved interlocked with motion of an operation lever 2; a piston 66 vertically moved by receiving an air pressure of a spring brake operation device 8 and urging force by a main spring 66S; and a valve element 65 vertically moved by receiving vertical movement of the plunger 64 and urging force of a return spring 65 or the like. The stem spring 64S is contractedly provided between the plunger 64 and the piston 66. COPYRIGHT: (C)2007,JPO&INPIT
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