JPS5858964U - Hydraulic pressure control device in two-system control system for vehicles - 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 an explanatory diagram showing the configuration of a two-system control device including an embodiment of the present invention. FIG. 2 is a sectional view showing a main part of the embodiment shown in FIG. 1.

Claims (1)

[Claim for Utility Model Registration] Braking fluid pressure is reduced by a hydraulic pressure control valve installed in one piping system and supplied to one rear wheel cylinder, and the other rear wheel cylinder connected to the other piping system. The balance piston, which operates based on the pressure difference between the brake fluid pressure supplied to the other rear wheel cylinder, opens and closes the on-off valve provided in the other piping system, thereby reducing the brake fluid pressure supplied to the other rear wheel cylinder. In a hydraulic pressure control device in a two-system control system for a vehicle, the brake fluid pressure supplied to the other rear wheel cylinder is controlled to be equal to the brake fluid pressure supplied to the other rear wheel cylinder. a large diameter portion facing one end of the balance piston at an interval greater than the amount of movement required for the control operation of the balance piston; and a first pressure receiving surface on the opposite side of the first pressure receiving surface on the side of the large diameter portion. a stepped piston having a small diameter portion having a second pressure receiving surface having an area smaller than that of the stepped piston; and a through hole, the small diameter portion of the stepped piston is slidably fitted into the through hole; and the large-diameter portion, the annular piston having a third pressure-receiving surface that comes into contact with a stepped portion formed between the small-diameter portion and the second pressure-receiving surface that is larger than the first pressure-receiving surface. a stopper that prevents the annular piston from moving toward the balance piston; and a stopper that is connected to the one rear wheel cylinder and controls the braking hydraulic pressure of the rear wheel cylinder reduced by the hydraulic pressure control valve to the second rear wheel cylinder. a first hydraulic pressure chamber that acts on one pressure receiving surface; and a mask cylinder that supplies braking hydraulic pressure to the other rear wheel cylinder, and is connected to a mask cylinder that applies braking hydraulic pressure of the mask cylinder to the second pressure receiving surface and the third pressure receiving surface. a second hydraulic pressure chamber that acts on the stepped piston; and a second hydraulic pressure chamber that is inserted in a passage leading from a mask cylinder that supplies braking hydraulic pressure to the one rear wheel cylinder to the first hydraulic pressure chamber, and that is inclined with respect to the axis of the stepped piston. and a bypass valve provided with a valve body that opens the passage by being moved in a direction away from the stepped piston, the bypass valve being formed on the outer peripheral surface of the serving piston, and the serving piston, together with the annular piston, having a small diameter. When the valve body is moved toward the stepped piston, the valve body engages with and pushes the tip of an operating pin that protrudes in a direction oblique to the axis of the stepped piston; A hydraulic pressure control device in a two-system control device for a vehicle, comprising: a cam surface that moves the valve body in a direction in which the passage is opened.