JPS6358060U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing a brake fluid pressure control device which is an embodiment of the present invention, Fig. 2 is a front sectional view showing a proportioning valve in the above device, and Fig. 3 is a control valve in the above device. FIG. 4 is a front sectional view showing the load hydraulic pressure generator in the above device. FIG. 5 is a system diagram showing a brake fluid pressure control device in another embodiment of the present invention. 12: Master cylinder, 14: Brake pedal, 16, 18: Pressurizing chamber, 22: Front wheel cylinder, 20, 24, 32, 36, 40, 44
:Liquid passage, 30:Proportioning valve, 3
4: Rear wheel cylinder, 38: Control valve,
42: Load hydraulic pressure generator, 200: Detection switch,
210: Electromagnetic directional valve, 220: Drive circuit.

Claims (1)

[Claims for Utility Model Registration] (1) A master cylinder that generates brake fluid pressure based on brake operation, a brake cylinder that operates a brake that suppresses rotation of wheels, and transmits the brake fluid pressure to the brake cylinder. a load hydraulic pressure generator that generates a load hydraulic pressure according to the load applied to the wheel; and a load hydraulic pressure generator that is provided in the middle of the first liquid passage and that is configured to reduce the braking hydraulic pressure in advance. a proportioning valve that starts from a bending point hydraulic pressure and is connected to the load hydraulic pressure generator by a second liquid passage so that the bending point hydraulic pressure is increased as the load hydraulic pressure is higher; The second liquid passage is provided in the middle of the passage so as to be divided into a side part of the load hydraulic pressure generator and a side part of the proportioning valve, and in the first state, transmission of hydraulic pressure between the former and the latter is allowed. However, in the second state, the brake hydraulic pressure control device includes a hydraulic pressure transmission control means that prevents the transmission of hydraulic pressure from the former to the latter, and a brake operation detection means that outputs a pilot signal in response to the brake operation. is provided, and the hydraulic pressure transmission control means is connected to the brake operation detection means, and the hydraulic pressure transmission control means is set to the first state when the pilot signal is larger than a predetermined reference signal. . A brake fluid pressure control device characterized in that the second state is entered when the pilot signal is less than or equal to the reference signal. (2) The hydraulic pressure transmission control means includes a valve provided in a communication passage that communicates the load hydraulic pressure generator side and the proportioning valve side, and the valve between the first state and the second state. The brake operation detection means is connected to a variable pressure chamber whose pressure increases in response to the brake operation, and transmits the pressure in the variable pressure chamber to the control piston as the pilot signal. The brake fluid pressure control device according to claim (1), which is a pilot passage for guiding the brake fluid. (3) The hydraulic pressure transmission control means includes a valve provided in a communication passage that communicates the side part of the load hydraulic pressure generator and the side part of the proportioning valve, and the valve in the first state and the second state. and an electromagnetic drive means for switching between states, and the brake operation detection means is a detection switch that supplies an electrical signal as the pilot signal to the electromagnetic drive means in response to the operation of the brake operation member. A brake fluid pressure control device according to claim (1) of a certain utility model registration.