JPS60183658U - Anti-skid type hydraulic brake device for automobiles - Google Patents

Abstract

(57) [Summary] 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 showing a hydraulic brake device that is an embodiment of the present invention, and FIGS. 2, 3, and 4 are models of the reservoir, switching valve, and throttle switching valve in FIG. 1, respectively. FIG. FIG. 5 is a graph showing the operation of the throttle switching valve shown in FIG. (50, 52: Rear wheel cylinder, 58° 60: Front wheel cylinder) (Brake cylinder), 62
: Switching valve, 64: Solenoid control valve, 74: Throttle switching valve, 76
: Reservoir passage, 78: Reservoir, 88: Pump, 92
: pump passage, 96: controller, 134: no-metsujingu, 136: piston, 146: air chamber, 152: first throttle, 154: second throttle, 156: valve seat, 160: valve element, 162 spring, 164: Control passage.

Claims (2)

[Scope of utility model registration request] (1) A mask cylinder that generates brake fluid pressure in response to the operation of the brake operating member, a brake cylinder that operates the brake that suppresses wheel rotation, and a main fluid that guides the brake fluid pressure generated in the mask cylinder to the brake cylinder. passage, and a pressure increase permissible state that is provided in the middle of the main fluid passage and allows the brake cylinder to communicate with the mask cylinder to allow the brake cylinder fluid pressure to rise, and a pressure rise permit state that allows the brake cylinder to communicate with the reservoir to allow the brake cylinder fluid pressure to decrease. an electromagnetic control valve that can be switched to a pressure drop permissible state that allows the brake fluid to fall; a controller that controls the electromagnetic valve so that the slip rate of the wheels falls within an appropriate range; An anti-skid type hydraulic brake system for an automobile including a pump supplied to a portion connecting a mask cylinder and an electromagnetic control valve, wherein a first throttle is provided in the middle of a reservoir passage connecting the electromagnetic control valve and the reservoir; A bypass passage including a second throttle is provided in parallel with the first throttle, and
A cut valve is provided in the bypass passage, which opens when the hydraulic pressure in a portion of the reservoir passage closer to the brake cylinder than the first and second throttles is below a set value, and closes when the hydraulic pressure exceeds the set value. An anti-skid device featuring: (2) The cut valve has a mounting hole having a large-diameter hole and a small-diameter hole with the stepped portion as a boundary, and the large-diameter hole and the small-diameter hole are each liquid-tight. It has a large diameter part and a small diameter part that are slidably fitted together, and an air chamber is formed between the stepped part formed at the boundary between the large diameter part and the small diameter part and the stepped part of the housing. and a piston that receives hydraulic pressure from a portion of the bypass passage on the brake cylinder side, respectively, on the end faces of the large diameter portion and the small diameter portion, and urges the piston in a direction to increase the area of the air chamber. a spring; a valve element provided on the small diameter side of the piston and moved together with the piston; and a valve seat provided in the housing opposite to the valve element and working together with the valve element to shut off the bypass passage. A hydraulic brake device according to claim 1 of the utility model registration claim.