KR980008934A - Proportional control valve of automotive hydraulic system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a proportional control valve for an automotive hydraulic system, and in constituting a braking hydraulic system of an automobile having a proportional control valve for braking a wheel cylinder of left and right rear wheels by reducing an operating hydraulic pressure from a master cylinder, Further comprising a bypass valve portion (BP), wherein the bypass valve portion comprises: The inlet 11 and the outlet 12 of the proportional control valve PVR of the right rear wheel further extend the inside of the working pipe 13 to pass through the front inlet of the working pipe 60 of the bypass valve BPF The inlet port 1 and the outlet port 12 of the proportional control valve PVL of the left rear wheel communicate with the front inlet 41 and the front outlet 42 of the operation pipe 60, The variable pressure control piston 61 which is a long piston member communicates with the rear inlet 52 and the rear outlet 51 on the rear side of the operating pipe 60 and the front and rear springs 62-1, And the length of the variable-pressure control piston 61 is set to be greater than the length of the front inlet 41, the front outlet 42, the rear inlet 52, the rear outlet 51 which are suitable for simultaneously opening and closing the front inlet 41 and the front outlet 42 or opening and closing the rear inlet 52 and the rear outlet 51 at the same time when moving forward or backward, It characterized by that, and a left rear wheel, in the case of a failure of the brake hydraulic pressure system of the right front wheel occurs, the bypass valve is of the right rear wheel braking pressure that increases with a variable section (BP) by the above operation.

Description

Proportional control valve of automotive hydraulic system

1 is a sectional view showing one embodiment of a proportional control valve of a conventional automotive hydraulic system; Fig.

FIG. 2 is a sectional view showing a proportional control valve of a vehicle hydraulic system according to the present invention. FIG.

Description of reference numerals used in the main parts of the drawings

BP: bypass valve part PVR: proportional control valve (right rear)

PVL: Proportional control valve (of left rear wheel) 1, 11: Inlet section

2, 12: outlet part 3, 13, 60: working channel

41: front inlet 42: front outlet

51: rear inlet 52: rear outlet

61: variable pressure control piston 63: stroke limiting stopper

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a proportional control valve for an automotive hydraulic system, and more particularly, to a proportional control valve of a vehicle hydraulic system that provides a plurality of bypass functions to a proportional control valve of a vehicle hydraulic system, The braking pressure of the other side is raised to prevent the entire braking force from being lowered.

The braking system of the vehicle controls the uneven state of the required braking pressure between the front and rear wheels so as to control the braking pressure to a certain level and to control the braking pressure of the right rear wheel proportional to the braking pressure applied to the left and right wheels A proportional control valve is used as a control member between the master cylinder and the wheel cylinder for the braking pressure system of the front and rear wheels so that the proportional control valve is constituted by a member having a single body, So that hydraulic pressure is transmitted to the braking device of the right rear wheel. The proportional control valves of the front and right rear wheels are formed on the single body, respectively, and are called dual proportional control valves.

In the proportional control valve of the above-described conventional configuration, when failure occurs in any of the braking systems of the front, rear, and rear wheels, it is difficult to secure a normal braking distance only by the hydraulic operating force of the front and rear wheel braking systems of normal design values, The reason for this is that the proportional control valve of the rear wheel is independently constituted so that the braking pressure of the other side can not be changed due to the failure of one side, Because.

It is an object of the present invention to solve the problems of the proportional control valve for braking front and rear right and left rear wheels of the conventional structure.

The proportional control valve of the automotive hydraulic system of the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing one embodiment of a proportional control valve of a conventional automotive hydraulic system, and FIG. 2 is a sectional view showing a proportional control valve of a automotive hydraulic system according to the present invention.

A general dual type proportional control valve shown in FIG. 1 will be described.

The proportional control valves for the front and rear wheels are constructed differently from each other only in terms of the working oil pressure, and therefore the configuration is the same, so that the lower portion is assumed to be the left front wheel and the right rear wheel.

The housing chain proportional control valve of the tubular body is constituted as follows.

The proportional control valve (PVL) for the downward left and front rear wheels is constituted as a single inner tubular body formed between the inlet portion 1 and the outlet portion 2 of the braking hydraulic pressure in a single body V, The control valve 5 is supported in the inside of the working pipe 3 by means of a spring 4 so that the diameter of the working pipe 3 is reduced toward the outlet part 2, Is interposed between the seat valve 6 of the inlet section 1 and the seat valve 7 of the outlet section 2 and the control valve 5 extends from the outlet section 2 side, The shape of the working pipe 3 is similar to that of the working pipe 3.

The space between the inner surface of the working pipe 3 and the seat valve 6 is hermetically sealed as a packing material 8 and sealed between the seat valve 6 and the control valve 5 by an annular packing material 8 ' have. The end portion of the inlet section 1 is provided with a cap 9 for screwing in for assembly and repair.

The right upper right proportional control valve (PVR) for the left rear wheel has the same configuration as that for the left front wheel and the right rear wheel.

That is, the braking oil pressure inlet 11, the outlet 12, the working channel 13, the control valve 15 supported by the spring 14, the seat valve 16, the seat valve 17, As the packing 18 and 18 '.

The proportional control valve of the automotive hydraulic system of the present invention, which has been developed in view of the problem of the proportional control valve of the conventional automotive hydraulic system, will be explained together with the second aspect.

The proportional control valve of the automotive hydraulic system of the present invention is applied to both the front and rear right wheels so that when the hydraulic system of the left rear wheel or the right rear wheel fails (failure of the flow path and failure of the operating part) To control the pressure.

The front and rear right wheels are equipped with a proportional control valve (PV) which is common, and the bypass valve (BP) is shared with the proportional control valve.

The bypass valve unit BPF is constituted by a control valve and a single housing 30 as shown in the figure.

The inlet 11 and the outlet 12 of the proportional control valve PVR of the right rear wheel further extend in the inside of the working pipe 13 and are connected to the front inlet of the working pipe 60 of the bypass valve BPF 41 and the front outlet 42 and the outlet portion 2 and the inlet portion 1 of the proportional control valve PVL of the left rear wheel communicate with the front inlet 41 and the front outlet 41 of the above- (52) and the rear outlet (51) located at the rear side of the rear wall (42).

As shown in the figure, a variable-pressure control piston 61, which is a piston member having a relatively long length, is provided in the inside of the above-mentioned working conduit 60 via the front and rear springs 62-1 and 62-2 and the packing ring 67, And is slid in front of the restricting stopper (63).

The stroke limiting stopper 63 is inserted into one side by the cap 66 via the packing ring 65 and closed.

The length of the variable pressure control piston 61 is a valve body that opens and closes the front inlet 41, the front outlet 42, the rear inlet 52 and the rear outlet 51, It is required to have a length suitable for simultaneously opening and closing the inlet 41 and the front outlet 42 or opening and closing the rear inlet 52 and the rear outlet 51 at the same time.

That is, when the variable-pressure control piston 41 is located at the left end side of the drawing (i.e., when the left front wheel hydraulic system is in a failure state), the front inlet 41 and the front outlet 42 are closed, (That is, when the right front wheel hydraulic system fails), it operates to close the rear inlet 52 and the rear outlet 51.

When the variable-pressure control piston 61 is positioned in the inside of the working conduit 60, when the braking system on the rear-wheel side of the front and rear wheels is normally performed, the inlet and outlet of each one of the forward and rear wheel- .

The front inlet 41 and the front outlet 42 and the rear inlet 52 and the rear outlet 51 are fluidically closed It will be blocked.

The setting of this position is possible by adjusting the design hydraulic pressure value applied to the left and right rear wheel braking systems and the elastic modulus of the springs 62-1 and 62-2.

The function and effect of the proportional control valve of the automotive hydraulic system of the present invention having the above-described structure will be described in detail.

If the braking system of the upper right rear wheel is broken, the variable-pressure control piston 41 is driven by the hydraulic pressure on the right rear wheel side to which the normal pressure is applied in the working conduit 60, ) To overcome.

The rear inlet 52 and the rear outlet 51 are fluidly connected due to the open space of the working conduit 60 so that the high pressure is applied to the left rear wheel braking system without proportional control operation, And braking is performed at a braking pressure. When the braking system of the left rear wheel of the lower side is broken, the variable-pressure control piston 41 is urged by the spring 62- 1 so that the rear inlet 52 and the rear outlet 51 are closed while the front inlet 41 and the front outlet 42 are opened and fluidly connected to each other, The braking force is increased by braking the right rear wheel at a braking pressure higher than the steady state which is applied to the braking system and performing the proportional control.

In the proportional control valve of the automotive hydraulic system of the present invention as described above, when a failure occurs in the braking system of either one of the left and right rear wheels and the hydraulic pressure is lowered, the proportional control valve automatically detects the hydraulic pressure, Thereby preventing a traffic accident by increasing the braking force by applying a high braking pressure without proportional control.

Claims (6)

And a proportional control valve for braking the wheel cylinders of the left rear wheel and the right rear wheel by reducing the operating hydraulic pressure from the master cylinder, wherein the proportional control valve (PV) of the left and right rear wheels is a single And a bypass valve (BP), which is a means for stopping the proportional control operation when the left or right hydraulic pressure system fails, is shared by the housing body of the proportional control valve. 2. The automatic transmission according to claim 1, wherein the proportional control valves (PVL, PVR) of the left and right rear wheels are constituted as a single inner circumferential rim formed between the braking hydraulic pressure inlet portions (1, 11) and the outlet portions The working channels 3 and 13 are elastically supported by the spring 14 in the inside of the working pipe 13 in such a shape that the diameter thereof is decreased while the fluid acts on the outlet portions 2 and 12, A control valve 15 interposed between the seat valve 16 of the outlet section 12 and the seat valve 17 of the outlet section 12 and having an outer diameter reduced toward the outlet section 12, And a packing material (18) between the inner surface and the seat valve (16) and a packing material (18) between the seat valve (16) and the control valve (15) Proportional control valve of hydraulic system. And a proportional control valve for braking the wheel cylinders of the left rear wheel and the right rear wheel by reducing the operating hydraulic pressure from the master cylinder, wherein the proportional control valve (PV) of the left and right rear wheels is a single And a bypass valve portion (BP) which is a means for stopping the proportional control operation when the hydraulic system of the left or right wheel fails in the housing body of the right rear wheel, wherein the bypass valve portion (BP) The inlet part 11 and the outlet part 12 of the valve PVR extend further in the inside of the working pipe 13 so that the front inlet 41 of the working pipe 60 of the bypass valve part BPF, And the inlet portion 1 and the outlet portion 12 of the proportional control valve PVL of the left rear wheel communicate with the front inlet 41 of the working conduit 60 and the rear inlet 41 behind the front outlet 42, And a piston member communicating with the inlet port 52 and the rear outlet port 51, The pressure control piston 61 is provided in front of the stroke limiting stopper 63 via the front and rear springs 62-1 and 62-2 and the length of the variable pressure control piston 61 is equal to the length of the front inlet 41, The front inlet 41 and the front outlet 42 are simultaneously opened or closed when the front inlet 42 and the rear inlet 52 are opened or closed and the rear inlet 52 is opened and closed, And the rear outlet (51) are simultaneously opened and closed. The variable pressure control piston (61) according to claim 3, wherein when the braking system of the rear right and left rear wheels is normally performed when the variable pressure control piston (61) is positioned inside the working pipe (6), each one inlet or outlet Wherein the hydraulic control valve is closed at the same time. 5. The hydraulic control apparatus according to claim 4, wherein simultaneous closing of the inlet or outlet of each one of the left and right rear wheel proportional control valves of the variable pressure control piston (61) ) ≪ / RTI > of the vehicle hydraulic system. The control valve according to any one of claims 1 to 3, wherein when the braking system of the left front wheel and the right rear wheel is broken, the variable-pressure control piston (41) is biased toward the right- The rear inlet 52 and the rear outlet 51 are fluidly connected due to the open space of the working duct 60 and the braking system of the right front wheel and the rear left wheel is broken, The variable pressure control piston 41 is pushed over the spring 62-1 to the right in the drawing with the high oil pressure on the left front wheel side where the normal pressure is applied in the working conduit 60, The front inlet 41 and the front outlet 42 are opened and fluidly connected so that the front and rear right brakes are braked at a higher braking pressure than the normal state without a proportional control operation Proportional control valve of automotive hydraulic system. ※ Note: It is disclosed by the contents of the first application.