JPS6124353U - 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 the drawing]

FIG. 1 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. FIG. 2 is a front sectional view of an accumulator in another embodiment of the present invention.

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 wheel rotation, and a brake that controls the brake fluid pressure generated in the mask cylinder. There is a main fluid passage leading to the cylinder, and a pressure increase permissible state in which the brake cylinder is communicated with the mask cylinder to allow the brake cylinder fluid pressure to rise, and a pressure increase permissible state in which the brake cylinder fluid pressure is allowed to increase by communicating with the brake cylinder and the brake cylinder is in communication with the reservoir. a hydraulic pressure control valve that can be switched to a pressure drop permissible state that allows a drop in cylinder hydraulic pressure; a controller that controls the hydraulic pressure control valve so that the slip ratio of the wheels falls within an appropriate range; A pump that pumps up liquid and supplies it to a portion of the main liquid passageway between the mask cylinder and the liquid pressure control valve; and a piston that is liquid-tightly and slidably fitted into the housing, so that the volume can be varied within the housing. A fluid chamber is formed, and the piston is biased by the biasing means in a direction to reduce the volume of the fluid chamber, so that the fluid chamber becomes a pressure accumulator that stores the brake fluid discharged from the pump under high pressure. a backflow prevention device that prevents brake fluid supplied from the pump to the main fluid passage from flowing back toward the mask cylinder at least while the controller is controlling the hydraulic pressure control valve; In the anti-skid type hydraulic bracer device for automobiles, the main liquid passage includes a partial liquid passage formed in the housing or piston of the accumulator, the partial liquid passage is provided with the backflow prevention device, and the pressure accumulation chamber is provided with the backflow prevention device. When the piston has moved to a position where the volume of the housing is larger than a predetermined value, the backflow prevention device is forced to become incapable of preventing backflow based on the relative movement between the piston and the housing. A hydraulic brake device characterized by being provided with a mechanism.