| 摘要 |
<p>842,537. Fluid-pressure brakes. BENDIX AVIATION CORPORATION. Feb. 16, 1959 [March 31, 1958], No. 5337/59. Class 103 (1). An hydraulic braking system for automotive vehicles, comprises disc brakes and shoe brakes. Operation of master cylinder D supplies pressure to a servo-unit C, of the type disclosed in Specification 620,407, which forces hydraulic fluid from chamber 62 to the front wheel disc brakes A and, via ports 80, 84 of valve E, to rear wheel. shoe brakes B. When master cylinder pressure increases from 15 to 50 p.s.i., the pressure in chamber 62 rises from 15- 150 p.s.i., the braking effort of disc brakes A increasing over this range and the shoes of brakes B being brought into rubbing contact with the drums. When master cylinder output pressure reaches 50 p.s.i. it moves a piston 92, 88, in valve E, against spring 104 to close port 80, and at 160 p.s.i. it acts, via passage 114, in chamber 110 to move piston 116 to open port 112 and connect the master cylinder D to brakes B via port 84 for further actuation of the rear wheel brakes, the brakes A being continually actuated from servo-unit C. A modification of valve E disconnects ports 80 and 84 by the pressure from servo-unit C when it reaches approximately 150 p.s.i. and connects ports 108 and 84 by the master cylinder pressure when it reaches approximately 160 p.s.i.</p> |
