| 摘要 |
PURPOSE:To aim at simplifying and minaturizing the structure of a solenoid servo-valve, by providing such an arrangement that the operating force of a brake pedal is boosted by a boosting device with the use of a magnet to make the ratio of a hydraulic brake pressure in a master cylinder and the operating force to be constant. CONSTITUTION:When a brake pedal 1 is operated, the operating force of the pedal 1 is transmitted through a rod 2 to a pressure sensitive rubber sheet A which therefore, decreases its electrical resistance. Then, one of the inputs (e, a) of a differential amplifier 11 becomes low and the output thereof becomes high, and therefore, a transistor Tr12 is turned on to energize a solenoid coil 8. Therefore, a magnetic member 16 is slightly moved leftward, overcoming a spring 10, and therefore, a push rod 3 presses the piston of a master cylinder 4 to produce hydraulic brake pressure. At this time, the reaction force of the hydraulic brake pressure is transmitted through the rod 3 to a pressure sensitive rubber sheet B which therefore, decreases its electrical resistance. Then, when a necessary boosting power is obtained, the output of the differential amplifier 11 becomes zero, and therefore, the transistor Tr1 is turned off to deenergize the solenoid coil 8. |
