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Braking device related to assisted control for the tractor vehicle and its trailer
Braking device related to assisted control for the tractor vehicle and its trailer
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机译:与牵引车及其挂车的辅助控制有关的制动装置
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1,184,491. Vehicle braking systems. REGIE NATIONALE DES USINES RENAULT. 13 June, 1967 [2 Aug., 1966], No. 27334/67. Heading F2F. An hydraulic braking system has a pair of brake pedals acting mechanically on a master cylinder and on control elements in the hydraulic circuit, the pressure in the master cylinder controlling a servo unit supplied by an hydraulic pump, the servo unit operating trailer brakes and also increasing the pressure in the master cylinder. The Figure shows a system with two pedals 9, 10 operating individual right and left wheel brakes of a tractor, such that if both pedals are simultaneously depressed, both brakes are operated at the same pressure. With the pedal not pressed (as 10) the brake line 13 is connected to a reservoir 25 through open valve 6 but cut off from the master cylinder 1 by closed valve 4. When a pedal is pressed (as 9) a cam 33 allows the spring-loaded valve 5 to close and cut-off the brake line 12 from the reservoir, while another cam 32 opens valve 3 to connect line 12 with the master cylinder via lines 34 and 35. Cam 33 also presses on a pin 37 at the end of a lever 11 to operate the master cylinder push member 14, the pressure being communicated to the chambers of valves 3 and 4 to operate one or both brakes. This pressure is also applied via line 20 to raise a piston 22 and valve 23 in the servo unit 2 so that a chamber 19 is disconnected from the reservoir 25 and placed in communication with a chamber 16 connected via 15 to an hydraulic pump (not shown). Chamber 16 also communicates via chamber 17 and line 18 to other hydraulic units on the vehicle. The upward movement of valve 23 throttles the connection between 16 and 17 so that pressure rises in chamber 16; this is fed back through chamber 19 and line 7 to give servo assistance to the master cylinder and through line 8 to operate the trailer brakes. The pressure rise is also applied through passage 29 to the top of the valve 23 which thus takes up an equilibrium position when the pressures on it balance. This position is also influenced by the upward movement throttling the hydraulic pump line at 42. If other units on the vehicle are in use such that the pressure in line 18 is higher than required to operate the brakes, the equilibrium position is such as to close the connection between 16 and 19, so that the braking pressure is independent of the pressure in line 18. If the pressure in line 20 rises above a certain value, a disc 30 shuts this off from the valve 23, and the equilibrium position of the latter is then determined by a spring 24. The apparatus shown may be constructed as a number of sub-units.
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