KR200293713Y1 - Vehicle Foot Brake Valve - Google Patents

Abstract

The present invention relates to a foot brake valve for a vehicle, the purpose is to improve the support structure of the compression spring 170 to easily set its initial tension.

Vehicle foot brake valve 100 according to the present invention bush piston 120 to support the ring-shaped support plate 122 supported from the bottom thereof to adjust the load value of the compression spring (170) embedded in the bush piston 120 The inner circumferential surface of the was combined with another. Therefore, it is easy to adjust the height of the support plate 122 has the advantage that the initial tension setting of the compression spring 170 can be easily performed.

Description

Vehicle Foot Brake Valve

The present invention relates to a foot brake valve used in an air brake system for a vehicle, and more particularly, to a support structure of a compression spring that adjusts the brake reaction speed by inducing a jumping phenomenon upon initial pressure formation in response to an applied external force. It is about.

In general, in a small car, the power applied to the brake pedal is generated by the power unit, and the amplified force has been used to brake the vehicle. In the case of a large vehicle, such as a commercial vehicle, the braking force of the vehicle is not sufficient due to the force generated by the hydraulic power unit. A full air brake system using only a bay has been applied. 1 is a schematic diagram of a full air brake system.

The initial state of the full air brake system is the foot brake valve (10), the air master cylinder (4), and the brakes (1a, 1b) provided in the front and rear wheels, respectively, is filled with high-pressure air from the air tank (3) The foot brake valve 10 is closed. In this state, when the driver steps on the pedal 10a to brake the vehicle, the foot brake valve 10 is opened so that high pressure air flows into the air master cylinder through the pipe 2 and the foot brake valve The flow path of the air master cylinder 4 in communication with the air tank 3 is opened by the pressure of the air introduced from the (10) side. Subsequently, when the flow path of the air master cylinder 4 communicating with the air tank 3 is opened, braking hydraulic pressure is formed by the high pressure air, which is transmitted to the brakes 1a and 1b to brake the vehicle.

Figure 2 is a cross-sectional view showing the overall structure of such a conventional foot brake valve, briefly described as follows.

When the driver steps on the pedal 10a, the piston 10b is lowered, and the cover plate 18, bush piston 12, and first guide built in the housing 11 and the base housing 15 by the piston 10b. The piston 13, the power piston 14, and the second guide piston 16 are sequentially lowered. At this time, the bush piston 12 is lowered by a load acting while the plurality of compression springs 17 embedded therein are compressed. By operation of each of the pistons, a gap is generated between the housing 11 and the first guide piston 13, and a gap is also formed between the base housing 15 and the second guide piston 16.

As a result, the inlet port 11a and the outlet port 11b of the housing 11 communicate with each other, and the inlet port 15a and the outlet port 15b of the base housing 15 communicate with each other, and the high pressure air on the side of the air tank 3 By being supplied to the air master cylinder 4 side through two pipes 2 of the foot brake valve 10, this is opened.

However, this conventional foot brake valve 10 has a problem that can not react quickly to the external force applied to the pedal (10a). That is, when an external force is applied to the pedal 10a, each piston 10b is lowered and air is supplied to the air master cylinder 4 (refer FIG. 1). At this time, since the air is a compressive fluid, the air master cylinder 4 is opened while the loss pressure is generated, and since the vehicle is braked by the air pressure flowing therein, at the moment of braking and at the moment when external force is applied to the pedal 10a. The time difference occurs, the foot brake valve 10 has a problem that the reaction is not made quickly.

In order to solve this problem, conventionally, as shown in FIG. 3, a plurality of washers 12b are provided so that the compression spring 17 located at the edge of the plurality of compression springs embedded in the bush piston 12 always maintains an appropriate compression state. Was installed overlapping. The washer 12b is installed in the seating groove 12a formed at the edge of the bush piston 120 so as to reduce the distance between the bush piston 12 and the cover plate 18, thereby reducing the compression spring 17 located at the edge. Keep compressed.

Accordingly, when an external force is applied to the pedal 10a (see FIG. 2), the bush piston 12 is lowered more rapidly, and the initial air pressure to which the external force is applied momentarily rises, thereby improving the reactivity of the valve.

However, the foot brake valve 10 improves the responsiveness of the valve through a plurality of washers 12b. If a load failure occurs in the functional test, the foot brake valve 10 is disassembled to the inside of the bush piston 12 so that the number of washers 12b is increased. The load value of the compression spring 17 must be set again by increasing or decreasing. Therefore, another problem arises that the disassembly and assembly is repeatedly performed until the load value of the compression spring 17 reaches the set value.

The present invention is to solve this problem, the object of the present invention is to couple the inner ring surface of the bush piston to the inner circumferential surface of the bush piston to support the annular spring support plate to adjust the load value of the compression spring embedded in the bush piston To provide a vehicle foot brake valve that facilitates the adjustment of the height of the support plate to easily perform the initial tension setting of the compression spring.

1 is a schematic diagram of a general full air brake system.

Figure 2 is a side cross-sectional view showing the overall structure of a typical foot brake valve.

3 is a cross-sectional view showing an internal structure of another conventional bush piston.

Figure 4 is a side cross-sectional view showing the overall structure of a vehicle foot brake valve according to the present invention.

5 is a perspective view showing an extract of the spring support member according to the present invention.

* Description of the symbols for the main parts of the drawings *

110. Housing 111. Inlet 112. Outlet

120. Bushing piston 121. Female thread 122. Support plate

123. Male thread 124 Hole 125 Guide part

126 stud bolt 130,160 guide piston 140 power piston

150 .. Base housing 170 .. Compression spring

The present invention for achieving this purpose, the pedal is provided at the top and the housing is in communication with the air tank and the air master cylinder, the elastically installed in the upper portion of the housing according to its operation is lowered when the external force is applied to the pedal and the external force is removed In a foot brake valve for a vehicle having a compression spring which is built into the bush piston, the bush piston is raised and lowered by the external force applied from the pedals to lower the bush piston.

The bottom portion of the bush piston is coupled to be able to adjust the horizontal height and the compression spring is supported by the lower portion is characterized in that the ring-shaped support plate is provided to quickly lower the bush piston when the external force is transmitted from the pedal.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. Figure 4 is a side cross-sectional view showing the overall structure of the vehicle foot brake valve according to the present invention, Figure 5 is a perspective view showing an extract of the support plate according to the present invention. (A full air brake system to which a foot brake valve for a vehicle according to the present invention is applied is the same as that of the related art.

Foot brake valve 100 according to the present invention, as shown in these, the housing 110, the pedal 100a and the piston 100b is installed on the upper, the second guide piston 160 to be described later in the lower It is largely classified into a built-in base housing 150.

Both sides of the housing 110 are formed with an inlet 111 communicating with an air tank 3 (see FIG. 1) installed in a vehicle, and an outlet 112 communicating with an air master cylinder 4 (see FIG. 2). In addition, the upper and lower bush pistons 120 are provided at the upper side of the housing 110 in accordance with the pressing force of the pedal 100a, and the first guide piston 130 is adjacent to the lower end of the bush pistons 120. It is installed elastically. An upper end of the power piston 140 is fitted into and coupled to the first guide piston 130, and a lower side of the power piston 140 protrudes below the housing 100. In addition, the lower end of the protruding power piston 140 is inserted and installed in the upper portion of the base housing 150 in which the inlet 151 and the discharge port 152 are formed at both sides, and the second guide piston 160 is embedded. Reference numeral 190 is an air discharge pipe provided at the lower end of the base housing 150, and compressed air is discharged to the outside of the base housing 150.

On the other hand, the cover plate 180 is provided to cover the upper portion of the bush piston 120 so as to be slidable in the vertical direction, and the plurality of compression springs 170 are installed in the bush piston 180 to have a concentric circle. This is to transfer the external force applied to the pedal 100a directly to the bush piston 120. And at the bottom of the bush piston 120, a ring-shaped support plate 122 for maintaining the compression spring 170 located at the edge as a characteristic element of the present invention in a more compressed state is installed, the pedal (100a) Responsiveness of the valve 100 is improved by rapidly lowering the bush piston 120 against the applied external force.

The support plate 122 is provided to support the lower end of the compression spring 170. For this purpose, the internal threaded portion 121 protrudes from the inner circumferential surface of the bottom of the bush piston 120, and the external threaded portion is formed on the outer side of the support plate 122. A male screw portion 123 is provided to be engaged with the body 121. Accordingly, by rotating the support plate 122 it is possible to adjust the height, it is possible to easily set the degree of compression of the compression spring 170 located at the edge. In addition, the support plate 122 is formed with three holes 124 spaced apart from each other, the guide portion 125 is formed to be bent upward to prevent the separation of the compression spring (170). The hole 124 may be inserted into a separate member and rotate it, and when the setting is completed, the end of the stub bolt 126 is inserted into the hole 124 to fix the support plate 122.

Next will be described the operation of the vehicle foot brake valve 100 according to the present invention configured as described above.

First, when the driver steps on the pedal 100a while the vehicle is running, the piston 100b is lowered, whereby the bush piston 120 and the cover plate 180 are simultaneously lowered. Subsequently, the first guide piston 130, the power piston 140, and the second guide piston 160 are sequentially lowered, whereby the inlet 111 of the housing 110, which is closed by the first guide piston 130, is closed. And the discharge port 112 communicate with each other, and the compressed air of the air tank 3 (see FIG. 1) is transmitted to the air master cylinder 4 (see FIG. 1) through the discharge port 112. The air master cylinder 4 is opened by the air pressure transmitted through the discharge port 112, and the high pressure air on the side of the air tank 3 flows into the air master cylinder 4, whereby the brake 1b, FIG. 1 Will brake). In addition, the inlet 151 and the outlet 152 of the base housing 150, which are closed by the second guide piston 160, also communicate with each other, thereby performing the same function.

This action is performed by the bush piston 120 which is lowered by the pedal 100a. Since the bush piston 120 has a compression spring 170 properly compressed by the support plate 122, the pedal 100a is embedded. Each piston is lowered quickly against the external force applied to Accordingly, the pressure of the air discharged from the valve 100 is initially raised instantaneously and discharged at a high pressure. That is, the external force applied from the pedal 100a by the compression spring 170 maintained in the compressed state acts directly on the bush piston 120, so when the pedal 100a is stepped on, the pressure rapidly rises inside the housing 100. High pressure air discharge responds quickly.

At this time, the support plate 122 according to the present invention for setting the degree of compression of the compression spring 170 is coupled to the inner circumferential surface of the bottom of the bush piston 120 so as to easily adjust the horizontal height of the compression spring 170 When the initial tension is set and the compression spring 170 located at the edge is disassembled and the support plate 122 is rotated to adjust the height, the compression degree of the compression spring 170 can be easily adjusted.

In the foot brake valve for a vehicle according to the present invention, a ring-shaped spring support plate supported by a lower portion of the bush piston is bi-engaged with an inner circumferential surface of a bush piston to adjust a load value of a compression spring embedded in the bush piston. Therefore, it is easy to adjust the height of the support plate has the advantage that can easily perform the initial tension setting of the compression spring.

Claims (2)

A pedal 100a is provided at an upper portion of the housing 110 for communicating the air tank 3 and the air master cylinder 4 according to the operation thereof, and is elastically installed at an upper portion of the housing 110. When the external force is applied to the descending and when the external force is removed, the bush piston 120, which is built up to the bush piston 120 is compressed by the external force applied from the pedal (100a) to lower the bush piston 120 In a foot brake valve for a vehicle having a compression spring (170), The bottom portion of the bush piston 120 is coupled to the horizontal height adjustment is possible, and the compression spring 170 is supported by the lower portion so that the compression when the external force is transmitted from the pedal (100a) to quickly lower the bush piston 120 Vehicle foot brake valve, characterized in that the ring-shaped support plate 122 is provided. The lower inner circumferential surface of the bush piston 120 is formed with a female screw portion 121, and the outer surface of the support plate 122 is coupled to the female screw portion 121 to adjust its height. Foot brake valve for a vehicle, characterized in that the male screw portion 123 is provided to enable.