| 摘要 |
<p>562,884. Fluid - actuated valves. BENDIX AVIATION CORPORATION. Dec. 7, 1942, No. 17399. Convention date, April 11, 1942. [Class 135] [Also in Group XXXIV] In a pressure-limiting valve device which may be interposed between the hydraulic master cylinder and the front wheel brakes of a vehicle brake system, the pressure liquid acts upon differential areas of a plunger against the pressure of a spring to control the valve and the spring pressure is adjustable by a member operable from the exterior of the device and having a projection arranged to seat upon the helical surface of a stop member. The device shown comprises a casing 20 provided with ports 23, 24 adapted to be connected'respectively to an hydraulic master cylinder, and to the front brakes of a vehicle. The master cylinder is connected directlv to the rear brakes. A plunger 37 under the pressure of a spring 42 normally holds open a valve 34 by means of a projection 36, to establish the connection of the master cylinder with the front brakes through port 23, chamber 26 and passage 27. The chamber 29 is connected to passage 27 by passage 28. When the fluid pressure established by the master cylinder acting upon the end face of the plunger port 38 overcomes the fluid pressure acting in chamber 29 upon the annular area between the plunger ports 37, 40 and the pressure of the spring 42, the plunger moves to the right and the valve 34 closes. To permit adjustment of the pressure of the spring it abuts on the part 43 of a rod 44 provided with a pin 46 adapted to seat on 'one or other of a series of steps 48 formed in the helical surface of an annular member 47, adjustment being effected by turning the cap 45. A passage 50 permits escape of liquid which leaks past the plunger.</p> |
