KR100728836B1 - Brake valve - Google Patents

Abstract

The present invention relates to a brake valve. The brake valve of the present invention includes a first block having a booster chamber, a first drain chamber and an inlet port, a second block having a master chamber and an outlet port, and a second drain chamber communicating with the first drain chamber of the first block. And an inlet port, a booster chamber, and an inlet port of the first block, the first block having a drain port, the first block, the first block, the second block, and the third block. And a spool for selectively communicating the first drain chamber and the master chamber, wherein the spool is divided into a first spool and a second spool, and the first spool and the second spool are connected to each other. It is characterized in that it is connected to the joint movement. In particular, the first spool is formed with a coupling groove, the second spool is formed with a coupling protrusion fitted to form a spherical coupling to the coupling groove of the first spool. According to the present invention, by dividing the spool into a first spool and a second spool capable of articulating each other, the up and down movement of the second spool generated in the process of transmitting the operating force of the brake pedal is not transmitted to the first spool. Do not. Thus, the sliding portion of the first block and the spool requiring airtightness is not worn. In addition, by forming a notch for directly communicating the master chamber and the second drain chamber in the second spool, there is an advantage that can completely remove the air in the master chamber.

Description

Brake valve

1 is a hydraulic circuit diagram of a general brake valve,

2 and 3 are cross-sectional views cut at different positions to show the configuration of a conventional brake valve,

4 and 5 are cross-sectional views taken at different positions to show in detail the configuration of the brake valve according to the present invention.

♣ Explanation of symbols for the main parts of the drawing ♣

10: body 20: first block

24: booster chamber 25: first drain chamber

26: inlet port 30: the second block

34: master chamber 35: discharge port

40: third block 44: second drain chamber

45: drain port 80: first piston

82: second piston 100: spool

110: first spool 112: coupling groove

120: second spool 122: engaging projection

124: notch

The present invention relates to a brake valve, and more particularly, to a brake valve that can prevent uneven wear of the spool and smoothly discharge and remove air in the initial operation master chamber.

Recently, a hydraulic brake device using hydraulic pressure as an operating source is installed in an industrial vehicle. This hydraulic brake device has the advantage that the braking force can be evenly transmitted to all wheels, the friction loss is small, and the large braking force can be exerted even with a small operating force. On the other hand, such a hydraulic brake device is provided with the brake valve which gives a braking pressure, changing the flow of hydraulic fluid according to the operation force of a brake pedal.

This brake valve has a body 10 having an inlet port 26, an outlet port 35 and a drain port 45 as in the hydraulic circuit diagram shown in FIG. 1. The body 10 includes a spool valve 70, and also includes a booster chamber 24, drain chambers 25 and 44, and a master chamber 34. The first piston 80 and the second piston 82 which are operatively connected to each other are disposed in the booster chamber 24 and the master chamber 34, respectively. The spool valve 70 controls the flow of the hydraulic oil introduced from the inlet port 26, and is operatively connected to a brake pedal (not shown) and communicated with the P port and the P port communicating with the inlet port 26. A and B ports are available. In particular, the A port is configured to communicate with the drain chambers 25 and 44 and the master chamber 34, and the B port is connected to the booster chamber 24, respectively. Here, as the spool valve 70 moves from the neutral position to the operating position, the P port and the B port communicate with each other, whereby the hydraulic oil introduced into the inlet port 26 passes through the P port and the B port to the booster chamber 24. As it flows into the first piston 80 starts to pressurize. Subsequently, the second piston 82 is also moved by the first piston 80 to pressurize the hydraulic oil in the master chamber 34 to generate a braking pressure.

 Next, the configuration of a conventional brake valve will be described in detail in connection with the hydraulic circuit diagram as described above. That is, the brake valve has a body 10 as shown in FIGS. 2 and 3. The body 10 includes a first block 20, a second block 30, and a third block 40, and the first block 20, the second block 30, and the third block 40 include: Bore 22, 32, 42 communicating with each other are formed, respectively. Here, the booster chamber 24 and the first drain chamber 25 are formed in the bore 22 of the first block 20, and the master chamber 34 is formed in the bore 32 of the second block 30. In the bore 42 of the third block 40, a second drain chamber 44 communicating with the first drain chamber 25 of the first block 20 is formed.

In addition, the first block 20 is formed with an inlet port 26 for introducing the pressurized oil, the second block 30 is formed with a discharge port 35 for discharging the back pressure braking pressure oil, the third block A drain port 45 for draining the introduced hydraulic oil into the oil tank is formed at 40.

In addition, the spools 50 are movably disposed in the bores 22, 32, and 42 of the first block 20, the second block 30, and the third block 40. The spool 50 is configured so that one side extends out of the body 10. The protruding spool 50 is operatively connected with the brake pedal and is configured to be pulled by the operation of the brake pedal. The spool 50 is elastically pressed toward the inside of the body 10 by the compression spring 46 disposed in the second drain chamber 44 of the third block 40.

On the other hand, the spool 50 is configured to cooperate with the first block 20 to configure the spool valve 70, the spool valve 70 is configured to control the direction of movement of the hydraulic oil introduced through the inlet port 26 do. To this end, as shown in FIGS. 2 and 3, the spool 50 has a first passage 52 for communicating the inlet port 26 and the booster chamber 24, the inlet port 26 and the first drain chamber ( A second passage 54 for selectively communicating 25 and the master chamber 34 is formed. Here, the first passage 52 and the second passage 54 communicate with each other, the second passage 54 is the first drain chamber by the flow path 12 formed in the body 10 as shown in FIG. And a master chamber 34. In addition, the first drain chamber 25 of the first block 20 is in communication with the booster chamber 24 through the groove 55 formed in the spool 50 and at the same time as shown in FIG. It is configured to communicate with the second drain chamber (44) of. The first passage 52 and the second passage 54 have an inlet port 26, a booster chamber 24, an inlet port 26, and a first drain chamber 25 as the spool 50 moves left and right. And the master chamber 34 communicate with or block each other to selectively introduce the hydraulic oil introduced into the booster chamber 24 or the booster chamber 24 and the first drain chamber 25 and the master chamber 34. do.

In addition, the booster chamber 24 of the first block 20 and the master chamber 34 of the second block 30 move along the outer circumference of the spool 50 to the first piston 80 and the second piston 82. ) Are placed respectively. The first piston 80 moves by the pressurized oil flowing into the booster chamber 24 to pressurize the second piston 82, and the second piston 82 is driven by the first piston 80 by the master chamber 34. In the direction of reducing the volume of pressurized fluid to pressurize the hydraulic fluid in the master chamber 34. Of course, the pressurized hydraulic oil is discharged to the discharge port (35). Here, the second piston 82 is elastically supported in the direction of increasing the volume of the master chamber 34 by the compression spring 84, the first piston 80 is booster chamber (by the second piston 82) Elastically supported in a direction to reduce the volume of 24).

In addition, a vent passage 82a is formed in the second piston 82, and a passage 37 for communicating the vent passage 82a and the first drain chamber 25 is formed in the second block 30. The vent passage 82a is configured to discharge air in the master chamber 34 to the first drain chamber 25 at an initial stage of operation of the brake valve. The air introduced into the first drain chamber 25 is discharged to the outside through the second drain chamber 44 and the drain port 45. Here, the vent passage 82a and the passage 37 are configured to be gradually blocked as the second piston 82 moves in the direction of decreasing the volume of the master chamber 34.

Referring to the operation of the brake valve having such a configuration with reference to the hydraulic circuit diagram of Figure 1 as follows. First, when the brake pedal (not shown) is pressed in a state where the spool valve 70 is neutral, the spool valve 70 is moved from the neutral position to the operating position, and the P port of the spool valve 70 is moved to the operating position. And port B communicate with each other. In this state, the hydraulic oil introduced through the inlet port 26 flows into the booster chamber 24, and the hydraulic oil introduced into the booster chamber 24 pressurizes the first piston 80. Subsequently, the first piston 80 pressurizes the second piston 82 again, and the second piston 82 pressurizes the hydraulic oil while reducing the volume of the master chamber 34 to discharge the hydraulic oil to the discharge port 35. To be discharged. As a result, the working oil of the master chamber 34 is discharged through the discharge port 35 in the pressurized state to generate the braking pressure.

However, such a conventional brake valve has a problem in that the air mixed in the master chamber is included in the braking hydraulic pressure and the braking force is not completely removed depending on the installation position. In addition, the brake valve has a problem such that the hydraulic fluid is leaked by only a specific portion of the spool with long wear.

That is, as described above, in the initial operation of the valve, the air in the master chamber 34 is configured to be discharged through the vent passage 82a of the second piston 82 and the flow passage 37 of the second block 30. do. However, when the installation position or the installation direction of the brake valve is changed and the vent passage 82a and the flow passage 37 are disposed below the master chamber 34, the air in the master chamber 34 is vented by the hydraulic fluid flowing in. This results in failure to exit completely through 82a and flow path 37. As a result, the air in the master chamber 34 is present in the bubble state in the working oil to drop the braking force. In addition, the air discharged through the vent passage 82a and the flow passage 37 is again connected to the third block through the flow passage 12 of the body 10 in the first drain chamber 25 as shown in FIG. 3. Even if the discharge path is long, such as being moved to the second drain chamber 44 of 40, the discharge was not smooth.                         

In addition, the spool 50 of the brake valve is configured to move left and right along the bores 22, 32, and 42 by the operation of the brake pedal. In this case, the long spool 50 of the brake pedal rotates. In the process of converting the operating force into a linear movement, a smile, but also up and down movement. As a result, the up and down movement of the spool 50 cannot make uniform contact with the inner walls of the bores 22, 32, 42, and thus only certain portions of the spool 50 are bores 22, 32, 42. ) It is continuously rubbed against the inner wall of). Since the unweared spool 50 cannot maintain an airtight relationship with the inner walls of the bores 22, 32, and 42, the hydraulic oil in each passage or each chamber may leak, and thus the braking force of the brake is significantly reduced. In particular, as the sliding portions of the spool valve 70, ie, the first block 20 and the spool 50, which require airtightness, the braking force of the brake is notably reduced due to the fact that the movement direction of the hydraulic oil is not properly controlled, as well as a malfunction. There is even concern.

Accordingly, the present invention has been made to solve the above conventional problems, the object is to provide a brake valve for preventing uneven wear of the spool.

Another object of the present invention is to provide a brake valve for smoothly discharging and removing air in the initial operation master chamber.

These objects include a first block having a booster chamber, a first drain chamber and an inlet port, a second block having a master chamber and an outlet port, a second drain chamber and a drain communicating with the first drain chamber of the first block. A third block having a port, the first block, the second block, and a third block movably disposed, operatively connected to the brake pedal, and the inlet port, the booster chamber and the inlet of the first block in accordance with movement. A brake valve of a hydraulic brake device having a spool for selectively communicating a port with a first drain chamber and a master chamber, wherein the spool is divided into a first spool and a second spool, and the first spool and the second spool. Can be achieved by a brake valve characterized in that it is articulatedly connected with respect to each other.

Preferably, the first spool has a coupling groove is formed, the second spool is characterized in that the coupling projection is fitted to form a spherical coupling to the coupling groove of the first spool.

Hereinafter, a preferred embodiment of a brake valve according to the present invention will be described in detail with reference to the accompanying drawings.

4 and 5 are cross-sectional views taken at different positions to show in detail the configuration of the brake valve according to the present invention. First, in describing the present invention with reference to FIGS. 4 and 5, the same components as those of the conventional brake valve are denoted by the same reference numerals, and detailed description thereof will be omitted.

Thus, looking at the features of the present invention in detail, the brake valve according to the present invention is a spool 100 moving along the bore (22, 32, 42) of the body 10, the first spool 110 and the second spool It can be seen that divided by 120. That is, the spool 100 is composed of a first spool 110 and a second spool 120, the first spool 110 and the second spool 120 are the bores 22, 32, 42) in turn. At this time, the end of the first spool 110 is formed with a coupling groove 112 is open at one side, the second spool 120 is fitted into the coupling groove 112 of the first spool 110 through one side open. Coupling protrusion 122 is formed. Coupling groove 112 and the coupling protrusion 122 is preferably approximately spherical coupling so that the first spool 110 and the second spool 120 can be articulated relative to each other. This allows the first spool 110 and the second spool 120 to be articulated relative to each other, so that the force is transmitted to the first spool 110 even when the second spool 120 is moved up and down by the brake pedal. It is to prevent this from happening. On the other hand, the first spool 110 is formed with the first passage 114 and the second passage 115 to supply the hydraulic oil supplied from the inlet port 26 to the first drain chamber 25 as in the prior art Of course.

By such a configuration, the up and down movement of the second spool 120 generated in the process of converting the rotational force of the brake pedal into the linear movement is not transmitted to the first spool 110, and thus the spool 100 is Only certain areas are not worn out. In particular, the airtight spool valve 70, that is, the sliding portion of the first block 20 and the spool 100 is not worn.

And the brake valve of the present invention has an air discharge means for removing the air in the initial operation master chamber 34. The air discharge means is installed together with the conventional air discharge means, that is, the vent passage 82a of the second piston 82 and the flow passage 37 of the second block 30, the length of the second spool 120 It has the notch part 124 formed along a direction. Two notches 124 are formed at both sides of the circumference of the second spool 120, and the master chamber 34 and the second drain chamber 44 together with the inner walls of the bore 32 of the second block 30 are formed. Construct a vent passage to communicate with. Here, the notch 124 is configured to gradually block the master chamber 34 and the second drain chamber 44 as the spool 100 moves.

The notch 124 allows air in the master chamber 34 to be directly discharged from the master chamber 34 to the second drain chamber 44 at the initial stage of operation of the valve, thereby smoothing the air in the master chamber 34. To be discharged. In particular, the notch 124 is formed on both sides of the spool 100 has an advantage that can smoothly discharge the air in the master chamber 34 regardless of the installation position and the installation direction of the valve. In addition, it is possible to completely remove the air in the master chamber 34 together with the conventional air exhaust means, that is, the vent passage 82a of the second piston 82 and the flow passage 37 of the second block 30. Have

The brake valve of the present invention having such a configuration divides the spool 100 into two first spools 110 and second spools 120 capable of articulating relative to each other, so that the operating force of the brake pedal is transmitted. The up and down movement of the generated second spool 120 is not transmitted to the first spool 110. Accordingly, the sliding portion of the first block 20 and the first spool 110 constituting the spool valve 70 is not worn. In addition, by forming a notch 124 for directly communicating the master chamber 34 and the second drain chamber 44 in the second spool 120, the air in the master chamber 34 can be completely removed Has

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope of the claims.

 The brake valve according to the present invention having such a configuration divides the spool into a first spool and a second spool capable of articulating with respect to each other, so that the up and down movement of the second spool generated in the process of transmitting the operating force of the brake pedal is performed. It is not delivered up to the first spool, so that the sliding parts of the first block and the spool requiring airtightness are not worn. In addition, by forming a notch for directly communicating the master chamber and the second drain chamber in the second spool, there is an advantage that can completely remove the air in the master chamber.

Claims (3)

A first block having a booster chamber, a first drain chamber and an inlet port, a second block having a master chamber and an outlet port, a second drain chamber and a drain port in communication with the first drain chamber of the first block; The inlet port and the booster chamber of the first block and the inlet port and the first block, the first block, the first block, the second block and the third block is movably disposed and operatively connected to the brake pedal A brake valve of a hydraulic brake device having a spool for selectively communicating one drain chamber and a master chamber, And the spool is divided into a first spool and a second spool, wherein the first spool and the second spool are articulatedly connected to each other. The brake valve of claim 1, wherein a coupling groove is formed in the first spool, and a coupling protrusion is formed in the second spool to form a spherical coupling to the coupling groove of the first spool. According to claim 1 or 2, wherein the second spool is formed with a notch for communicating the master chamber of the second block and the second drain chamber of the third block, the notch is the length of the second spool It is formed long along the direction, the brake valve, characterized in that two are formed symmetrically around the second spool.

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