JPH0752775Y2 - Vehicle air brake system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a vehicle air brake system in which an air dryer is interposed in a brake system.

b. Prior Art In a vehicle, an air dryer is interposed between a compressor and an air tank in order to use dry compressed air. Further, in this air dryer, when the air tank is sufficiently filled with compressed air, that is, when the air dryer is not used, the dry air is caused to flow backward to regenerate the desiccant.

As a method of regenerating the desiccant, there is also a method in which a purging sub-tank is provided between the air tank and the air dryer, dry air is stored in this sub-tank, and the desiccant is recirculated to the air dryer to regenerate the desiccant. However, this method requires a sub tank and must secure a space for it.

Therefore, as disclosed in JP-A-63-106377, there is provided a method of utilizing exhaust gas from a pneumatic device, for example, a brake actuator, and recirculating the exhaust gas to an air dryer to regenerate the desiccant. ing.

In this method, a switching valve that interlocks a quick release valve and a purge valve is incorporated in an air dryer, compressed air from the brake valve is supplied to the brake actuator via the quick release valve when the brake is operated, and the brake actuator is released when the brake is released. Compressed air is introduced into the desiccant through the quick release valve, and is released into the atmosphere through the desiccant. In addition,
The quick release valve adopted here is for guiding the exhaust gas from the brake actuator to the desiccant of the air dryer without returning it to the brake valve, and the switching valve supplies compressed air from the compressor to the air tank. The interval is for discharging the exhaust gas from the brake valve to the atmosphere without guiding it to the desiccant.

c. Problems to be Solved by the Invention By the way, as described above, when the air dryer is interposed in one of the brake systems of the brake valve and the brake actuator, for example, the rear brake pipeline, the quick release valve causes resistance especially in the braking operation. Then, there was a delay in the operation of the rear brake with respect to the front brake,
As a result, the balance of lining wear may be lost, and uniaxial premature wear may occur.

Therefore, an object of the present invention is to provide an air brake system in which an air dryer is interposed in one brake system to prevent uniaxial premature wear in a vehicle.

d. Means for Solving the Problems In the air brake system of the present invention, an air dryer integrally provided with a quick release valve and a switching valve interlocking with a purge valve is interposed in one of the brake systems so that the brake valve can be operated when the brake is operated. Compressed air of the brake actuator is supplied to the brake actuator via the quick release valve, and when the brake is released, the compressed air of the brake actuator is guided to the desiccant through the quick release valve and released to the atmosphere through the desiccant. In the air brake system for a vehicle described above, in addition to the quick release valve provided in the one brake system, the other quick release valve dedicated to the other brake system is also provided in the other brake system.

e. Action In the air brake system of the present invention, the resistance of the quick release valve also occurs in the other brake system when the brake is operated, so that it is balanced with the one brake system with the air dryer interposed.

f. Embodiment FIG. 1 shows an air brake system according to the present invention, and FIGS. 2 and 3 show the elements adopted in the system.

In this air brake system, the air dryer C is interposed in the pipeline between the compressor A and the air tank B,
Further, the air dryer C is also interposed in a conduit between the brake valve D, which is one brake system, and the rear brake actuator E. Further, in this air brake system, in the pipeline between the brake valve D and the front brake actuator F, which is the other brake system, apart from the quick release valve provided in the air dryer C, the other brake system dedicated to the other brake system is provided. A quick release balance G is interposed. In addition, in FIG.
Indicates a pressure regulator, and this pressure regulator H detects the pressure in the air tank B, and when the pressure reaches the upper limit set pressure, the compressor A is stopped and compressed air for piston operation is supplied to the air dryer C. When the air is supplied and the pressure in the air tank B is reduced to the lower limit set pressure, the compressor A is operated again and the compressed air supplied to the air dryer C is discharged to the outside.

As shown in FIG. 2, the air dryer C is composed of a cylindrical case 1 and a lower body 2 attached to the lower part of the case 1. An outlet 3 is provided at the upper end of the case 1, and the outlet 3 is connected to the air tank B. On the other hand, an inlet 4 is provided on the side surface of the lower body 2,
This inlet 4 is connected to the compressor A.

A desiccant 5 is contained in the case 1, and an oil filter 6 is arranged below the desiccant 5. The inner lower portion of the case 1 communicates with the inlet 4 through a hole 8 formed in the partition plate 7, so that the compressed air supplied to the inlet 4 passes through the oil filter 6 and the desiccant 5 toward the outlet 3. It is configured. The desiccant 5 is a pair of upper and lower mesh holding plates.
It is sandwiched by 9,10 and has a proper compression force applied by a spring 11.

A brake valve port 12 and a brake actuator port 13 are formed on the side surface of the lower body 2 as shown in FIG. 2 (a), and a pressure regulator port 14 is further formed as shown in FIG. 2 (b). There is. Each of these ports 12, 13 and 14 is connected to a brake valve by a pipe line.
D, rear brake actuator E, and pressure regulator H are connected.

A quick release valve 15 is arranged between the brake valve port 12 and the brake actuator port 13. The valve 15 is provided with a rubber disc 16, and the peripheral edge portion 16a and the central portion 16b of the disc 15 are in light contact with the seat surfaces 17 and 18 at all times. In this valve 15, when the pressure of the port 12 becomes relatively lower than the pressure of the port 13, the peripheral edge portion 16a of the disk 16 presses against the seat surface 17, and the central portion 16b
Moves away from the seat surface 18. On the other hand, one end of a passage 19 is connected to the central portion of the seat surface 18, and the other end of the passage 19 is connected to the chamber 20. The chamber 20 is in communication with the atmosphere via the switching valve 21. On the other hand, when the pressure of the port 12 is relatively higher than the pressure of the port 13, the central portion 16b of the disc 16 is pressed against the seat surface 18,
The peripheral portion 16a is separated from the seat surface 17.

An exhaust port 22 is formed in the center of the lower body 2. The exhaust port 22 communicates with the inlet 4 via the passage 23. A double rod type piston 24 is arranged in the center of the lower body 2 so as to be vertically movable. At the lower end of the lower rod 24a of the piston 24, the purge valve 25
Are integrally attached, and the valve body 25 and a valve seat 26 formed at the opening edge of the exhaust port 22 constitute a purge valve 27. A disc-shaped exhaust valve element 28 is integrally attached to the end of the upper rod 24b of the piston 24. On the other hand, below this valve body 28, a cylindrical partition member 29
An exhaust hole 30 is formed in the upper wall of the partition member 29. The space defined by the partition member 29 is open to the atmosphere via an exhaust passage 31 formed in the axis of the piston 24. Then, the valve body 28 and the exhaust hole 30
The switching valve 21 is constituted by and. A spring 32 is provided between the piston 24 and the partition member 29, and the spring 32 urges the piston 24 upward. The upper surface of the piston 24 is communicated with the pressure regulator port 14 via the passage 33, as shown in FIG.

On the other hand, a pipe 34 is disposed in the center of the case 1, and the chamber 20 is provided with a desiccant storage chamber through a purge passage 35 formed in the pipe 34 and a hole 36 formed in the outlet 3 of the air dryer C.
Connected to 37. A check valve 38 is provided in the pipe 35 so as to extend in the forward direction toward the outlet 3.

Further, as shown in FIG. 3, the quick release valve G interposed in the front brake system includes an input port 40, an output port 41 and an exhaust port 42 in the valve housing 39.
have. A rubber disc 43 is arranged between these ports 40, 41, 42. This disc 43
The peripheral portion 43a and the central portion 43b abut on the valve seats 44 and 45 of the valve housing 39, respectively.
It shuts off between 41 and 42. Then, when the pressure of the input port 40 is higher than the pressure of the output port 41, the central portion 43b of the disc 43 strongly presses the valve seat 45 to firmly close the exhaust port 42 and the peripheral portion 43a of the disc 43. Is seat 44
Be separated from. As a result, the compressed air at the input port 40 is supplied to the output port 41. When the pressure of the input port 40 becomes lower than the pressure of the output port 41, the peripheral edge portion 43a of the disc 43 strongly presses the valve seat 44 to close the input port 40 and the central portion 43b of the disc 43 opens the valve. Separate from the seat 45 and open the exhaust port 42. Therefore, the compressed air in the output port 41 is discharged from the exhaust port 42 to the atmosphere.

The input port 40 of the quick release valve G is connected to the brake valve D, and the output port 41 is connected to the front brake actuator F.

The operation of the air brake system will be described below.

The compressed air discharged from the air compressor A as shown in FIG. 1 is supplied to the inlet 4 of the air dryer C, passes through the hole 8 of the partition plate 7 as shown in FIG. After deoiling and dehumidifying with 6 and the desiccant 5, the air is supplied from the outlet 3 to the air tank B.

When the pressure of the air tank B rises to a predetermined upper limit set pressure due to the supply of this compressed air, the pressure regulator H detects this and the control pressure regulated by the pressure regulator H based on the detection result is the air compressor. The air compressor A is stopped from being supplied to the control unit of A, and the same control pressure is also supplied to the port 14 of the air dryer C to move the piston 24 downward. The valve body 28 of the switching valve 21 is operated, and the valve body 28 is exhausted by the exhaust hole 30.
To block. At this time, since the air dryer C of this system does not have a sub tank for purging, the purging action is not performed at the same time as the opening of the purge valve 27. However, if the brake actuator E is returned while the purge valve 27 is open, the brake actuator E
A purging action is performed by the dry exhaust air.

More specifically, when the pedal of the brake valve D shown in FIG. 1 is depressed, the compressed air in the air tank B is supplied to the brake valve port 12 of the air dryer C, and this compressed air is further passed through the quick release valve 15 and the brake actuator port 13. Is supplied to the brake actuator E.

Next, when the pedal of the brake valve D is released, the brake valve D exhausts air and the compressed air in the port 12 is exhausted to the atmosphere. In this way, when the pressure in the port 12 drops, the exhaust air from the brake actuator E is introduced into the chamber 20 via the quick release valve 15 and the passage 19.

At this time, when the valve body 28 of the switching valve 21 blocks the exhaust hole 30, the exhaust air passes through the purge passage 35 in the pipe 34,
The check valve 38 is pushed open to flow out to the outlet 3 side, passes through the hole 36, the desiccant 5 and the oil filter 6, and is further discharged from the purge valve 27 to the outside via the passage 23. At this time, the moisture and oil adhering to the desiccant 5 and the oil filter 6 are discharged to the outside together with the exhaust air, so that the desiccant 5 and the oil filter 6 can be regenerated.

On the other hand, when the exhaust hole 30 of the switching valve 21 is opened, the exhaust air is exhausted to the outside through the exhaust passage 31 in the piston 24.

Further, in the front brake system, when the pedal of the brake valve D is depressed, the compressed air in the air tank B is passed between the input port 40, the disc 43 and the valve seat 44 of the quick release valve G, and through the output port 41 to the brake actuator. Supplied to F.

Next, when the pedal of the brake valve D is released, the brake valve D exhausts the compressed air in the port 40 to the atmosphere. When the pressure of the port 40 is lowered in this way, the exhaust air from the brake actuator F is discharged to the exhaust port 42 through the space between the disc 43 and the valve seat 45, and then discharged from the exhaust port 42 to the atmosphere.

g. Effect of the Invention As described above, in the air brake system according to the present invention, one brake system with the air dryer intervening is provided with the quick release valve in the other brake system. The brake operation timings are almost the same. Therefore, lining wear is balanced and uniaxial premature wear does not occur.

[Brief description of drawings]

FIG. 1 is a pipeline diagram showing an air brake system according to the present invention, FIG. 2 (a) is a sectional side view of an air dryer used in the system, and FIG. 2 (b) is a half sectional view of the air dryer. The front view and FIG. 3 are sectional views of the quick release valve used in the system. A ... Compressor, B ... Air tank, C ... Air dryer, D ... Brake valve, E, F ... Brake actuator, G ... Other quick release valve, H
...... Pressure regulator, 1 ... Case, 2 ... Lower body, 3
Outlet, 4 Inlet, 5 desiccant, 6 oil filter, 12 brake valve port, 13 brake actuator port, 14 pressure regulator port, 15
… Quick release valve, 19 …… passage, 20 …… chamber, 21
...... Switching valve, 22 ...... Exhaust port, 23 ...... Passage, 24 ...... Piston, 27 ...... Purge valve, 31 ...... Exhaust passage, 33 ......
Passage, 35 ... Purge passage, 36 ... Hole, 37 ... Drying agent chamber, 38 ... Check valve, 39 ... Valve housing,
40 …… input port, 41 …… output port, 42 …… exhaust port, 43 …… disk, 44,45 …… valve seat.

Claims (1)

[Scope of utility model registration request] 1. An air dryer integrally provided with a quick release valve and a switching valve interlocked with a purge valve is interposed in one brake system, and compressed air from the brake valve is braked through the quick release valve during a brake operation. In the air brake system of a vehicle, which supplies compressed air of the brake actuator to the desiccant through the quick release valve when the brake is released, the compressed air of the brake actuator is released to the atmosphere through the desiccant. An air brake system for a vehicle, characterized in that, in addition to the quick release valve provided in the brake system, the other brake system is provided with the other quick release valve dedicated to the other brake system.