| 摘要 |
PURPOSE:To enhance safety of a brake system, by automatically operating a service brake together with an operation of a parking brake. CONSTITUTION:When a parking brake device 1 is operated, the operation is detected by a controller 61. The controller 61 passes an electric current to a solenoid 58 provided in a magnetic driving device 56, and a magnetic pole member 59 is first magnetized. Next, a plunger 57 is attracted by the pole member 59 against a spring 60, and a force is exerted on a point of force 54 of a lever 52. Then, the lever 52 is oscillated with a fulcrum 53 as a center, and a point of action 55 moves a valve plunger 23 leftwards. As a result, an operating rod 22 fixed integrally with the valve plunger 23 is also moved leftwards, the frist valve 31 and the second valve 41 are sequentially closed and opened, respectively, a booster 3 is operated, and finally, a service brake gear 2 is operated. |
