| 摘要 |
PURPOSE:To simplify a brake control mechanism for safety as much as possible by locating a multiplex check valve in a control flow passage between a brake control part for an ordinary use and an emergency and a skid preventing valve unit and providing a skid detecting part with a disconnecting part to disconnect an output from a skid detector when a brake control part for safety is operated. CONSTITUTION:Since, during operation of a brake for an ordinary use and an emergency, a brake command switch 15 is opened through operation of a brake command device 13, a relay 18 of a skid detector 5 is demagnetized, and a b-contact 18a of a circuit 17 is closed to operate a detector 5. When an emergency situation occurs, the switch 15 is pressed to close a brake com mand line 20 for safety. In this case, a brake control part 4a for safety is operat ed to feed pressure fluid to a multiplex check valve 14a. In the valve 14a, the one, being higher, of pressure fluid from a brake control part 4 for emergency and pressure fluid from the control part 4a, whichever it may be, is fed, in priority, to a skid preventing unit 7. Meanwhile, the relay 18 is excited, the b-contact 18a of the circuit 17 is opened, a feed valve 9 of the unit 7 is opened, an exhaust valve 10 is closed, and a brake operable state is ensured. |
