| 摘要 |
<p>1281413 Valves; fluid pressure brakes BENDIX CORP 28 Nov 1969 [27 Dec 1968] 58379/69 Heading F2F and F2V [Also in Divisions G1 H1 and H2] A three-way valve device controlling the flow of fluid pressure to a motor is controlled by the output from a variable frequency pulse generator. In an electro-hydraulic braking control system for a tractor-trailer type vehicle, Fig. 1, solenoid 62 operated three-way valve 54 controlling the fluid pressure to conduit 58 feeding the wheel brake actuators is operated in accordance with the average value of saw-tooth pulses on line 66 from electro-magnetic vibrator control device 10, Fig. 2. The vibrator 10 comprising armature 96, contact 100, core 94 and coil 92 energized from battery 32 vibrates at a frequency determined by the return force of spring 102 loaded by a further spring 108 in engagement with pivotably mounted hand lever 12, whereby movement of the lever 12 alters the loading of spring 102 and thereby the frequency of the vibrator. Hand lever 12 is provided with a roller 120 abutted by transmitting lever 118 controlled by rod 116 and piston 114 responsive to fluid pressure in conduit 14. When brake pedal 19 is depressed the increase in fluid pressure from brake cylinder 18 in conduit 14 results in the pivoting of lever 12 to decrease the load on spring 102 and decrease the output frequency of the vibrator. Coil 64 of valve 54 is thus de-energized so that spring 72 biases rod 70 to the left to close the connection between chambers 82, 84 and to open the connection between chambers 80, 82 until the fluid pressure force on sleeve 88 balances the resilient force of spring 72 minus the magnetic force on core 70 as controlled by coil 64. When the brake pedal is released the loading on spring 102 increases to increase the output frequency of the vibrator and thus the energization of coil 64. Rod 70 thus moves to the right to connect chambers 82 and 84 and disconnect chambers 80, 82 to allow fluid to flow to reservoir 46. Coil 122 provided on the vibrator is energized by the vehicle stoplight system 40, 42, 44 to decrease the energization of coil 92 to decrease the frequency of the output signal upon initial displacement of the brake pedal 19. In an alternative form of vibrator, Fig. 3 (not shown), the rod 116 connected to piston 114 passes through the control lever 12 and is in line with spring 102.</p> |
