JPS6176757U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a front sectional view of a hydraulic pressure control valve that is an embodiment of the present invention, and is also a system diagram showing an example of a hydraulic brake device in which the hydraulic pressure control valve is incorporated. FIG. 2 is an enlarged cross-sectional view of the portion shown in FIG. 1, and FIG. 3 is a side view showing the hydraulic pressure control valve of FIG. 1 together with its rear wheel load sensing mechanism. 4 is a graph showing the relationship between the front braking force and rear braking force of the brake device shown in FIG. 1, and FIG. 5 is a graph showing the control characteristics of the hydraulic control valve shown in FIG. 1. It is a graph. FIG. 6 is an enlarged sectional view showing the main parts of another embodiment of the present invention, and corresponds to FIG. 2. Figure 7 shows
FIG. 7 is a front cross-sectional view schematically showing a hydraulic pressure control valve according to yet another embodiment of the present invention. FIG. 8 is a graph showing an ideal braking force distribution curve when a one-box vehicle is lightly loaded. 2: Master cylinder, 16: Front wheel cylinder, 22: Rear wheel cylinder, 24:
Load sensitive proportioning valve (
hydraulic pressure control valve), 28: first port, 30: second port, 38: hydraulic chamber, 40: housing, 46:
Valve piston, 48: Cup seal, 50,1
02: Valve element, 52: Valve seat member, 54: Open/close valve, 5
6: Center hole, 58: Stopper, 64: First hydraulic chamber, 66: Second hydraulic chamber, {76: Compression coil spring, 78: Load sensing spring} (biasing means)
, 86: Rear axle housing, 90: Annular projection, 92: Small diameter section, 94: Large diameter section, 96, 98:
Seal ring, 106: Valve seat, 110: Compression coil spring (biasing means), 112: Proportioning valve (hydraulic pressure control valve).

Claims (1)

[Claims for Utility Model Registration] A hydraulic pressure control valve that controls hydraulic pressure generated by a master cylinder and supplied to a brake cylinder, the first port being connected to the master cylinder and the brake cylinder. a housing comprising a second port connected to the first port and a hydraulic chamber communicating with the first port and the second port; and a housing provided in the hydraulic chamber so as to be openable and closable, and in a closed state, the hydraulic chamber is connected to the first port. an on-off valve that partitions a first hydraulic pressure chamber that communicates with the hydraulic pressure chamber and a second hydraulic pressure chamber that communicates with the second port; a valve piston that is movably disposed in the forward position and maintains the on-off valve in an open state when it is in the forward position, and that moves backward to close the on-off valve; and a valve piston that urges the valve piston to the forward position. and a biasing means for resisting the biasing means, and the valve piston resists the hydraulic pressure of both the first hydraulic pressure chamber and the second hydraulic pressure chamber against the biasing means both in an open state and a closed state of the on-off valve. 1. A hydraulic control valve having negative gradient pressure reducing characteristics, characterized by having a shape that receives the pressure in a direction.