JPS6124355U - Anti-skid type hydraulic brake device for automobiles - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

The figure is a circuit diagram of a hydraulic brake device that is an embodiment of the present invention, and is also a front sectional view of an accumulator. 10: Mask cylinder, 12: Brake petanore (brake operating member), 22.24: Front wheel cylinder (brake cylinder), 30, 32: Rear wheel cylinder (brake cylinder), 34: Accumulator, 36: Hydraulic pressure control Valve, 40: Mask cylinder side passage (main liquid passage), 42: Intermediate passage (main liquid passage), 44: Wheel cylinder side passage (main liquid passage), 48: Reservoir, 50
: Pump, 66: Controller, 80: Accumulator body (housing), 82: Cover (housing), 8
4: Cylinder body (housing), 92: Stepped piston, 94: Pressure accumulation chamber, 102: Spring (biasing means),
106: Valve, 108: Small piston, 110: Valve chamber, 1
12: Small piston chamber, 114: Liquid passage, 116: Valve seat,
118: Spring, 122: Throttle passage, 127: Backflow prevention device, 128 Two-valve opening ronde, 134: Backflow prevention release mechanism.

Claims (1)

[Scope of claim for utility model registration] A mask cylinder that generates brake fluid pressure in response to the operation of a brake operating member, a brake cylinder that operates a brake that suppresses rotation of a wheel, and a brake that controls the brake fluid pressure generated in the mask cylinder. There is a main fluid passage that leads fluid pressure to the brake cylinder, a pressure increase permissible state that connects the brake cylinder to the mask cylinder, which allows the brake cylinder fluid pressure to rise, and a brake ring that is installed in the middle of the main fluid passage. A hydraulic pressure control valve that can be connected to a reservoir and switched to a pressure drop permissible state that allows a drop in brake cylinder hydraulic pressure, and a controller that controls the hydraulic pressure control valve so that the slip ratio of the wheel falls within an appropriate range. a pump that pumps up brake fluid from the reservoir and supplies it to a portion of the main fluid passage between the mask cylinder and the hydraulic pressure control valve; and a piston that is fluid-tightly and slidably fitted into the housing. zf) A fluid chamber with a variable volume is formed in the pump, and the piston is biased by a biasing means in a direction to decrease the volume of the fluid chamber, so that the fluid chamber is activated by the brake fluid discharged from the pump. an accumulator serving as a pressure storage chamber for storing under high pressure; and at least while the contourer is controlling the hydraulic pressure control valve, the brake fluid supplied from the pump to the main fluid passage flows back toward the mask cylinder side. In the anti-skid type hydraulic brake system for automobiles, the accumulator is inserted into a part of the main fluid passage between a part of the main fluid passage where brake fluid is returned from the pump and the mask cylinder. The main liquid passage is divided into a mask cylinder side passage on the mask cylinder side of the accumulator and an intermediate passage on the hydraulic pressure control valve side, and a valve chamber and a small piston chamber are arranged in the axial direction inside the piston of the accumulator. are arranged so that the small piston chamber is on the pressure accumulation chamber side, and a valve element and a small piston are arranged in the valve chamber and the small piston chamber, respectively, on the opposite side of the waist valve chamber from the small piston. A liquid passage is opened on the wall facing the valve element from the opening, a valve seat is formed around the opening, and biasing means is provided for urging the valve element away from the valve seat. A throttle passage is provided that communicates the valve chamber and the pressure accumulation chamber with each other while giving a throttle effect, and furthermore, a liquid passage opening into the valve chamber is connected to the supply cylinder side passage, and the pressure accumulation chamber is connected to the intermediate passage. When the brake fluid flows from the pressure accumulation chamber side to the valve chamber side, the small piston moves the valve element with the urging force of the urging means due to the hydraulic pressure difference generated on both sides of the small piston based on the throttling action. The valve chamber, piston chamber, valve element, small piston, biasing means, throttle passage, etc. constitute the backflow prevention device by seating the valve seat against the The piston of the accumulator is penetrated liquid-tightly from the side opposite to the pressure storage chamber side to reach the valve chamber, and when the piston moves by more than a set value in the direction of increasing the volume of the storage chamber, it directly hits the nozzle housing. Alternatively, a hydraulic brake device is provided with a valve opening rod that indirectly contacts the piston and moves relative to the piston, and forcibly pushes the valve element away from the valve seat by contacting the valve element.