KR102028099B1 - Clear system of parking brake for emergency vehicle - Google Patents

Abstract

The present invention relates to a release of a vehicle parking brake in an emergency, comprising: a service hydraulic line configured to generate hydraulic pressure by a master cylinder with push operation of a brake pedal for hydraulic pressure to be applied to a service brake piston to operate a service brake; a parking hydraulic line for operating or releasing a parking brake by actuating or releasing hydraulic pressure to the parking brake piston as a solenoid valve is repositioned by operation of a parking brake switch; and a brake block installed on the parking hydraulic line and having a parking brake release valve for changing a flow path by screw operation, and an emergency hydraulic line connecting the parking brake release valve and the service hydraulic line.

Description

Clear system of parking brake for emergency vehicle

The present invention relates to a system for releasing a parking brake for a vehicle in an emergency, and more particularly, in a vehicle common brake device in which a service brake and a parking brake are shared in construction equipment and an industrial vehicle, a service in an emergency situation in which the parking brake device is not released. It relates to a system for releasing a parking brake for an emergency vehicle which makes it easier to release the parking brake device by the hydraulic pressure of the brake device.

In general, a brake device for a construction vehicle such as a commercial vehicle, a forklift, a wheel loader, and the like and an industrial vehicle, a service brake device for braking when driving and a parking brake device for braking when parking are used.

Conventionally, the service brake device is mounted on the axle hub side to which both ends of the drive shaft are connected, and the parking brake device is mounted on the axle input shaft that inputs power to the drive shaft.

As described above, when the service brake device is conventionally mounted on the axle hub side and the parking brake device is mounted on the axle input shaft, since the service brake device and the parking brake device are configured separately, the number of parts and the number of assembly operations are increased so that the overall There is a disadvantage that the productivity is lowered, the production cost is increased.

In addition, in the case of the parking brake device mounted on the axle input shaft side, the vehicle may be shaken by the gear backlash generated from the axle hub shaft to the axle hub through the axle drive shaft during operation for vehicle parking. There was a problem that the sense of stability is lowered, the sensitivity quality during parking braking is greatly reduced.

Therefore, recently, in order to solve the above problems, as disclosed in Korean Patent Laid-Open Publication No. 10-2015-0089255, a construction brake and a common brake device for an industrial vehicle having a service brake device and a parking brake device have been proposed.

Hereinafter, the configuration of a conventional brake device for construction equipment and industrial vehicles will be described.

1 and 2 are conventional brakes for construction equipment and industrial vehicles according to the prior art, Figure 1 is a cross-sectional view showing a service brake operating state, Figure 2 is a cross-sectional view showing a parking brake operating state.

In FIG. 1 and FIG. 2, reference numeral 20 denotes an axle drive shaft that rotates for driving by receiving power from an axle input shaft connected to an engine side, and driving wheels are mounted at both ends of the axle drive shaft 20. The axle hub 22 is connected.

In addition, an axle housing 24 for protecting the axle drive shaft 20 is disposed at an outer diameter portion of the axle drive shaft 20, and an axle hub housing for protecting the axle hub at an outer diameter portion of the axle hub 22 ( 26 are spaced apart.

In addition, a service brake for braking during driving is provided between an outer diameter portion of both ends of the axle drive shaft 20, an axle housing 24 surrounding the axle drive shaft 20, and an axle hub housing 26 surrounding the axle hub 22. There is provided a common brake device 100 in which the device and the parking brake device for braking at the same time are shared.

At this time, as one configuration of the common brake device 100, the common brake pack 110 in which the disc plate and the friction plate are alternately arranged is mounted on the outer diameter portions of both ends of the axle drive shaft 20.

In addition, a service brake piston 120 is disposed at an inner position of the common brake pack 110 and pressurizes the common brake pack 110 by hydraulic pressure provided to obtain a braking force while driving. have.

At this time, in order to supply the hydraulic pressure for pressurizing the service brake piston 120 toward the common brake pack 110 to the axle housing 24, the hydraulic supply port for the service brake communicating with the inner surface of the service brake piston 120 is formed through. do.

That is, as a passage for supplying hydraulic pressure for pressing the service brake piston 120 toward the common brake pack 110 at a position coinciding with the inner surface side of the service brake piston 120 of the axle housing 24, the service brake piston ( The hydraulic pressure supply port 160 for the service brake communicating with the inner surface of the 120 is formed to pass through.

Therefore, when the hydraulic pressure is supplied through the hydraulic pressure supply port for the service brake, the service brake piston 120 is moved toward the common brake pack 110 to press the disk plate and the friction plate of the common brake pack 110 in close contact with each other, Braking of the service brake device is achieved.

In addition, when the hydraulic pressure applied to the service brake piston 120 is released, the service brake piston 120 is provided with a return means using an elastic force so that the service brake piston 120 returns to its original position.

That is, the return means using the elastic force penetrates the inner diameter portion of the service brake piston 120 and is fastened to the axle housing 24, the head of the bolt 132 and the outer surface of the service brake piston 120. It is composed of a service brake spring 130 which is arranged to be compressible.

Therefore, when the service brake piston 120 presses the disk plate and the friction plate of the common brake pack 110 in close contact with each other, the service brake spring 130 is compressed, while the service brake hydraulic supply port 160 is provided. When the applied hydraulic pressure is released, the service brake piston 120 returns to its original position (non-braking position) by the elastic restoring force of the service brake spring 130.

On the other hand, the parking brake piston 140 is disposed in the inner diameter portion of the axle housing 24 while being outside the common brake pack 110, and the parking brake piston 140 has a hydraulic release to obtain a braking force when parking. Pressing the common brake pack 110 by the elastic restoring force of the parking brake spring 150 provided together.

At this time, the parking brake spring 150 is arranged to be compressible between the outer surface of the parking brake piston 140 and the axle hub housing 26.

Preferably, the spring seating recess into which both ends of the parking brake spring 150 are inserted into the outer surface of the parking brake piston 140 and the inner surface of the axle hub housing 26 to prevent the parking brake spring 150 from being separated. 152 is formed.

In addition, the parking brake is applied to a position corresponding to the inner surface of the parking brake piston 140 of the axle housing 24 to apply hydraulic pressure for separating the parking brake piston 140 from the common brake pack 110 when the parking brake is released. The parking brake hydraulic pressure supply port 170 communicating with the inner surface of the piston 140 is formed to pass through.

Therefore, when the hydraulic pressure is applied to the parking brake hydraulic pressure supply port 170, the parking brake piston 140 is separated from the common brake pack 110 by the hydraulic pressure at this time while compressing the parking brake spring 150. It is moved toward the axle hub housing 26.

On the other hand, when the hydraulic pressure is released to the hydraulic pressure supply port for the parking brake, the parking brake piston 140 presses the common brake pack 110 by the elastic restoring force of the compressed parking brake spring 150, thereby Braking is achieved.

Looking at the operation relationship for the conventional construction equipment and the industrial brake device for an industrial vehicle made as described above are as follows.

Service brake actuation (see Fig. 1)

First, the hydraulic pressure is applied through the service brake hydraulic pressure supply port 160 of the axle housing 24.

Therefore, the service brake piston 120 is moved toward the common brake pack 110 by the hydraulic pressure supplied through the hydraulic brake opening 160 for the service brake, so that the disk plate and the friction plate of the common brake pack 110 are brought into close contact with each other. By applying pressure, braking of the service brake device is achieved.

At this time, the parking brake is maintained in the brake release state (non-braking state) when the vehicle is running and when the service brake is operated.

That is, hydraulic pressure is also applied to the parking brake hydraulic pressure supply port 170 so that the parking brake piston 140 is separated from the common brake pack 110 and the compression of the parking brake spring 150 is directed toward the axle hub housing 26. In the moved state, that is, the state is moved to the parking brake braking release position.

Of course, when the hydraulic pressure supplied through the service brake hydraulic supply port 160 is released, the service brake piston 120 returns to its original position (non-braking position) by the elastic restoring force of the service brake spring 130.

Parking brake operation (see Fig. 2)

First, the hydraulic pressure applied to the parking brake hydraulic pressure supply port 170 is released.

When the hydraulic pressure is released to the parking brake hydraulic supply port 170 in this way, the parking brake piston 140 presses the common brake pack 110 by the elastic restoring force of the compressed parking brake spring 150, thereby parking the vehicle. Braking of the brake device takes place.

At this time, the hydraulic pressure is also maintained in the service brake hydraulic supply port 160, the service brake piston 120 is returned to its original position (non-braking position) by the elastic restoring force of the service brake spring 130 State is maintained.

Referring to Figure 3a to 3c the operating system of the brake system for the construction equipment and the industrial vehicle according to the prior art described once again the operation relationship as follows.

As shown in FIG. 3A, the parking brake is maintained in the brake release state (non-braking state) when the vehicle is driven and when the service brake is operated.

That is, in the parking brake device as the solenoid valve 240 installed in the parking hydraulic line 230 is opened, the hydraulic pressure is also applied to the parking brake hydraulic supply port 170, so that the parking brake piston 140 It is separated from the common brake pack 110 and at the same time moved to the axle hub housing 26 while compressing the parking brake spring 150, that is, to the parking brake braking release position.

In this state, when the driver pushes the brake pedal 200 to operate the service brake, as shown in FIG. 3B, the master brake 210 is operated through the service hydraulic line 220 as shown in FIG. 3B. As the hydraulic pressure is applied to the service brake piston 120, the service brake piston 120 moves toward the common brake pack 110 to press the disk plate and the friction plate of the common brake pack 110 in close contact with each other. Accordingly, braking of the service brake device is achieved.

At this time, the parking brake is maintained in the brake release state (non-braking state) when the vehicle is running and when the service brake is operated.

That is, in the parking brake device as the solenoid valve 240 installed in the parking hydraulic line 230 is opened, the hydraulic pressure is also applied to the parking brake hydraulic supply port 170, so that the parking brake piston 140 It is separated from the common brake pack 110 and at the same time moved to the axle hub housing 26 while compressing the parking brake spring 150, that is, to the parking brake braking release position.

Of course, when the hydraulic pressure supplied through the service brake hydraulic supply port 160 is released, the service brake piston 120 returns to its original position (non-braking position) by the elastic restoring force of the service brake spring 130.

At this time, the first on-off valve 260 is installed between the solenoid valve 240 and the parking brake piston 140 on the parking hydraulic line, and the first check valve 232 is provided between the parking brake switch and the solenoid valve 240. ) Is installed, and the second on-off valve 250 is installed between the service hydraulic line 220 and the parking hydraulic line 230, wherein the second on-off valve 250 and the parking hydraulic line 230 are provided. 2 check valve 252 is provided.

Therefore, the hydraulic pressure supplied to the parking brake piston 140 through the parking hydraulic line 230 is restricted in flow in the reverse direction by the first check valve 232 and the second check valve 252.

On the other hand, the first on-off valve 260 is always in an open state during normal operation, or normal main, stop, the second on-off valve 250 is in an off state.

Therefore, when the driver operates the parking brake switch to maintain the parking state, the solenoid valve 240 operates as shown in FIG. 3B so that the fluid introduced into the parking brake piston 140 opens the first opening / closing valve ( After passing through the 260, the drain is made through the solenoid valve 240, the hydraulic pressure is released to the parking brake piston 140, the parking brake piston 140 is shared by the elastic restoring force of the parking brake spring. As the contact with the brake pack 110 is made, the parking brake is operated.

However, due to a failure of the solenoid valve 240 or an engine failure, the solenoid valve 240 may not operate properly or may not start, and thus, hydraulic pressure may not occur in the parking brake device. In this case, the parking brake may occur. As the hydraulic pressure applied to the piston 140 is not properly released, it may be difficult to pull the vehicle.

Therefore, in this case, a mechanic including a driver manually closes the first on / off valve 260 and, on the contrary, opens the second on / off valve 250, so that the parking brake device is driven by the service brake device. To be released.

That is, as shown in FIG. 3C, when the first on / off valve 260 is closed and the second on / off valve 250 is opened, the hydraulic pressure by the master cylinder 210 is pushed as the brake pedal 200 is pushed. This acts on the service hydraulic line 220, and thus fluid flows into the parking brake piston 140 through the second open / close valve 250 together with the service brake piston 120.

As the hydraulic pressure acts on the parking brake piston 140 by pushing the brake pedal 200, the parking brake piston 140 is spaced apart from the common brake pack 110 while compressing the parking brake spring. The parking brake can be released.

However, in the above-mentioned conventional technology, in case of an emergency such as damage to the solenoid valve 240 or an engine abnormality, a driver or a mechanic must directly close the first on / off valve 260 and open the second on / off valve 250. In addition, their work is very difficult except for highly skilled workers, and their workability is not so good that they cannot easily cope with emergencies.

Korea Patent Publication No. 10-2015-0089255 (2015.08.05.)

Accordingly, the present invention has been made in order to solve the above problems, the technical problem to be solved by the present invention, the traction according to the parking brake device is not released due to the occurrence of the solenoid valve abnormality or the engine abnormality, etc. In this case, it is possible to provide a release system for an emergency vehicle parking brake that allows a driver, a mechanic, or an operator to release the parking brake device more easily with a simple push operation of the brake pedal. .

In addition, another technical problem to be solved by the present invention, the driver or mechanic in the emergency situation, such as damage to the solenoid valve or engine abnormality, the parking brake is released by a simple screw operation of the parking brake release valve, the workability It is to provide a system for releasing a parking brake for an emergency vehicle that greatly improves the speed and flexibility of the emergency vehicle.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

In the emergency vehicle parking brake release system according to an embodiment of the present invention for solving the above problems, the hydraulic pressure acts on the service brake piston by generating the hydraulic pressure by the master cylinder by the push operation of the brake pedal to make the service brake operation Service hydraulic lines; A parking hydraulic line for operating or releasing the parking brake by actuating or releasing hydraulic pressure to the parking brake piston as the solenoid valve is repositioned by the operation of the parking brake switch; And a brake block installed on the parking hydraulic line, the brake block including a parking brake release valve for changing a flow path by a screw operation, and an emergency hydraulic line connecting the parking brake release valve and the service hydraulic line. Can be.

Here, during normal driving of the vehicle, the fluid flowing through the parking hydraulic line passes through the solenoid valve and the parking brake releasing valve to generate hydraulic pressure to the parking brake piston, and generates hydraulic pressure by the parking brake piston. The parking brake piston may be spaced apart from the common brake pack while pressing the parking brake spring.

In addition, during service brake operation of the vehicle, the master cylinder generates the hydraulic pressure by the push operation of the brake pedal, the hydraulic pressure generated by the master cylinder pressurizes the service brake piston through the service hydraulic line to the service brake piston A close contact with this common brake pack can be achieved.

Further, when the parking brake of the vehicle is operated, the fluid supply to the parking hydraulic line is released, and the solenoid valve is repositioned so that the fluid pressurizing the parking brake piston is drained through the parking brake release valve and the solenoid valve. Accordingly, the parking brake piston may be in close contact with the common brake pack by the elastic restoring force of the parking brake spring.

Meanwhile, in an emergency situation in which the parking brake operation is not released during the parking brake operation, the parking brake release valve is operated to change a flow path so as to connect the emergency hydraulic line and the parking hydraulic line and push the brake pedal. The hydraulic pressure generated by the master cylinder acts on the parking brake piston via the emergency hydraulic line and the parking hydraulic line, and the parking brake piston presses the parking brake spring by the hydraulic pressure of the parking brake piston. A gap with the brake pack can be made.

On the other hand, on the emergency hydraulic line, a check valve for blocking the flow of fluid to the service hydraulic line through the parking hydraulic line may be installed.

Other specific details of the invention are included in the detailed description and drawings.

According to the system for releasing the parking brake for a vehicle in an emergency according to an embodiment of the present invention, when the traction is difficult because the parking brake device is not released due to an abnormal occurrence of a solenoid valve or an engine error, an operator such as a driver or a mechanic By releasing the parking brake device more easily with a simple push operation of the brake pedal, a useful effect can be provided that can be flexibly handled in an emergency situation.

In particular, according to the release system of the vehicle parking brake for emergencies according to an embodiment of the present invention, the driver or mechanic releases the parking brake by a simple screw operation of the parking brake release valve in an emergency situation such as damage to the solenoid valve or engine abnormality. By being able to do so, the workability can be greatly improved, and a useful effect can be provided to be able to flexibly respond in an emergency.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a cross-sectional view showing a service brake operating state as a common brake device for construction equipment and industrial vehicles according to the prior art.
Figure 2 is a cross-sectional view showing a parking brake operating state as a common brake device for construction equipment and industrial vehicles according to the prior art.
3a to 3c is a schematic view showing a system for releasing a parking brake conventionally.
4 is a perspective view illustrating a brake block applied to a system for releasing a parking brake for a vehicle in an emergency according to an exemplary embodiment of the present invention.
5 is a plan view of FIG. 4.
Figure 6 is a schematic diagram showing a system for releasing the parking brake according to an embodiment of the present invention.
7 is a cross-sectional view taken along the line AA of FIG. 5 showing the structure of the brake block according to FIG. 6;
8 and 9 is a schematic view showing a system for releasing the parking brake according to an embodiment of the present invention.
10 is a cross-sectional view taken along the line AA of FIG. 5 showing the structure of the brake block according to FIG. 9;

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms, and only the embodiments of the present invention make the disclosure of the present invention complete and the general knowledge in the technical field to which the present invention belongs. It is provided to fully convey the scope of the invention to those skilled in the art, and the invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Thus, in some embodiments, well known process steps, well known structures and well known techniques are not described in detail in order to avoid obscuring the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, including and / or comprising means not to exclude the presence or addition of one or more other components, steps, and / or actions other than the components, steps, and / or actions mentioned. Used as. And “and / or” includes each and all combinations of one or more of the items mentioned.

In addition, embodiments described herein will be described with reference to perspective, cross-sectional, side and / or schematic views, which are ideal illustrative views of the present invention. Accordingly, shapes of the exemplary views may be modified by manufacturing techniques and / or tolerances. Therefore, the exemplary embodiments of the present invention are not limited to the specific forms shown, but include changes in forms generated according to manufacturing processes. In addition, each component in the drawings shown in the embodiment of the present invention may be shown to be somewhat enlarged or reduced in consideration of the convenience of description.

Hereinafter, the emergency release of the parking brake for a vehicle according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

4 is a perspective view illustrating a brake block applied to a system for releasing a parking brake for a vehicle in an emergency according to an exemplary embodiment of the present disclosure, and FIG. 5 is a plan view of FIG. 4.

6 is a schematic view showing a system for releasing a parking brake according to an exemplary embodiment of the present invention, and FIG. 7 is a cross-sectional view taken along the line A-A of FIG. 5 showing the structure of the brake block according to FIG. 6.

8 and 9 are schematic diagrams illustrating a system for releasing a parking brake according to an exemplary embodiment of the present invention, and FIG. 10 is a cross-sectional view taken along line AA of FIG. 5 illustrating a structure of a brake block according to FIG. 9. to be.

For reference, in describing the embodiments of the present invention, the same parts as in the related art are denoted by the same reference numerals, and repeated description thereof will be omitted.

First, as shown in FIGS. 4 and 5, the parking brake release valve 310 for changing the flow path of the fluid flowing into the parking brake device as it is moved in the longitudinal direction by a screw operation according to an embodiment of the present invention. ) Can be configured to include a brake block 300, the operation relationship according to the operation of the parking brake release valve 310 will be described in detail later.

Referring to FIG. 6, in the service brake device, when the driver pushes the brake pedal 500, the master cylinder 510 is operated to apply hydraulic pressure to the service brake piston 120 through the service hydraulic line 520. In addition, the service brake piston 120 moves toward the common brake pack 110 to press the disc plate and the friction plate of the common brake pack 110 in close contact with each other, thereby braking the service brake device.

At this time, the parking brake is maintained in the brake release state (non-braking state) when the vehicle is running and when the service brake is operated.

That is, in the parking brake device, the solenoid valve 620 installed in the parking hydraulic line 600 is in an open state, so that hydraulic pressure is also applied to the parking brake hydraulic supply port, so that the parking brake piston 140 has a common brake pack. It is detached from 110 and at the same time moved to the axle hub housing while compressing the parking brake spring, that is, to the parking brake braking release position.

Of course, when the hydraulic pressure supplied through the service brake hydraulic supply port is released, the service brake piston 120 returns to its original position (non-braking position) by the elastic restoring force of the service brake spring.

At this time, the parking brake release valve 310 is installed between the solenoid valve 620 and the parking brake piston 140 on the parking hydraulic line 600, and a first check is provided between the parking brake switch and the solenoid valve 620. A valve 610 is installed, and an emergency hydraulic line 320 is installed between the service hydraulic line 520 and the parking brake release valve 310, and a second check valve 322 is provided on the emergency hydraulic line 320. It is installed.

Therefore, the hydraulic pressure supplied to the parking brake piston 140 through the parking hydraulic line 600 is limited in flow in the reverse direction by the first check valve 610, and the parking brake piston (via the emergency hydraulic line 320) Hydraulic pressure supplied to 140 is also limited in flow in the reverse direction by the second check valve 322, its operation relationship will be described in detail later.

During normal driving

When the vehicle is running, the parking brake is maintained in the brake release state (non-braking state).

That is, as shown in Figure 6 and 7, through the first check valve 610, the solenoid valve 620 and the parking brake release valve 310 of the parking hydraulic line 600 to the parking brake piston 140 Hydraulic pressure is applied so that the parking brake piston 140 is separated from the common brake pack 110 and moved to the axle hub housing while compressing the parking brake spring, that is, the parking brake braking release position.

Service brake actuation and parking brake actuation

When the brake pedal 500 is pressed while driving the vehicle, as shown in FIG. 8, the hydraulic pressure is applied to the service brake piston 120 through the service hydraulic line 520 by the master cylinder 510. The service brake piston 120 presses the disk plate and the friction plate of the common brake pack 110 in close contact with each other, thereby braking the service brake device.

At this time, the hydraulic path of the solenoid valve 620 is changed by an input signal, so that the fluid filled in the parking brake piston 140 is discharged through the hydraulic supply port for parking brake and is changed through the changed flow path of the brake block 300. As it is drained, the parking brake piston 140 is moved in the direction of the common brake pack 110 by the elastic restoring force of the elastic spring, so that the parking brake piston 140 also maintains close contact with the common brake pack 110. do.

In this state, when the push on the brake pedal 500 is released and the parking brake switch is operated, the hydraulic pressure supply through the service hydraulic line 520 is released, so that the service brake device is released, and only the parking brake device is released. It stays in operation.

In emergency operation

Meanwhile, as shown in FIG. 8, in the state in which the parking brake device is operating as the solenoid valve 620 drains the fluid of the parking hydraulic line 600, the failure of the solenoid valve 620 causes the failure of the solenoid valve 620. As shown in FIG. 9, the parking brake device is not released when the flow path is formed, or when the hydraulic pressure does not work because the engine is not started due to an engine abnormality of the vehicle.

As such, when the parking brake device is not released, it becomes difficult to tow the vehicle. In this case, the parking brake device can be manually released.

That is, as shown in FIGS. 9 and 10, when the parking brake release valve 310 of the brake block 300 is simply screwed, the brake block 300 may include the service hydraulic line 520 and the emergency hydraulic line ( A flow path connecting the 320 and the parking hydraulic line 600 is formed.

In this state, when a mechanic including a driver pushes the brake pedal 500, the fluid flows to the service hydraulic line 520 by the operation of the master cylinder 510, so that hydraulic pressure is generated, and such fluid is an emergency hydraulic pressure. It passes through the line 322 and the flow path changed by the parking brake release valve 310 to flow through the parking hydraulic line 600 to the parking brake piston 140.

Therefore, the parking brake piston 140 is spaced apart from the common brake pack 110 while pressing the parking brake spring by hydraulic pressure, so that the parking brake device can be released.

At this time, the fluid flowing into the emergency hydraulic line 320 is limited to the movement in the reverse direction by the second check valve 322, it is possible to continue to maintain the release state of the parking brake device.

As described above, according to the release system of the vehicle parking brake device for emergency according to the embodiment of the present invention, the traction is not released due to the abnormal occurrence of the solenoid valve 620 or the engine abnormality, etc. In case of difficulty, the driver or mechanic can release the parking brake device more easily with a simple screw operation of the brake pedal 500, so that the driver or mechanic can flexibly cope with an emergency and of course the parking brake. Since the braking of the parking brake device can be released by a simple screw operation of the release valve 310, its workability is greatly improved, and thus it is possible to flexibly cope with an emergency.

Those skilled in the art will appreciate that the present invention can be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

110: common brake pack 120: service brake piston
140: parking brake piston 300: brake block
310: parking brake release valve 320: emergency hydraulic line
322: second check valve 500: brake pedal
510: master cylinder 520: service hydraulic line
600: parking hydraulic line 610: first check valve
620: Solenoid Valve

Claims (6)

In the parking brake system for a vehicle equipped with a common brake system, a service brake device for braking when driving, and a parking brake device for braking when parking.
A service hydraulic line for generating hydraulic pressure by the master cylinder by pushing the brake pedal to generate hydraulic pressure on the service brake piston to perform service brake operation;
A parking hydraulic line for operating or releasing the parking brake by actuating or releasing hydraulic pressure to the parking brake piston as the solenoid valve is repositioned by the operation of the parking brake switch; And
A parking brake release valve installed on the parking hydraulic line, the operator changing a flow path by a screw operation by a manual worker, and a brake block having an emergency hydraulic line connecting the parking brake release valve and the service hydraulic line; But
In an emergency situation in which the parking brake is not released during parking brake operation,
The parking brake release valve operator changes the flow path by screw operation by hand, thereby connecting the emergency hydraulic line and the parking hydraulic line,
Push the brake pedal so that the hydraulic pressure generated by the master cylinder acts on the emergency brake line and the parking brake piston through the parking hydraulic line, so that the parking brake device is released by the hydraulic generation of the parking brake piston. A system for releasing a parking brake for an emergency vehicle, characterized in that.
The method of claim 1,
In normal driving of the vehicle,
The fluid flowing through the parking hydraulic line passes through the solenoid valve and the parking brake release valve to generate hydraulic pressure to the parking brake piston.
And release the parking brake piston from the common brake pack while the parking brake piston presses the parking brake spring by the hydraulic pressure of the parking brake piston.
The method of claim 1,
When the vehicle's service brake is activated,
Pushing of the brake pedal causes the master cylinder to generate hydraulic pressure, and the hydraulic pressure generated by the master cylinder pressurizes the service brake piston through a service hydraulic line so that the service brake piston is in close contact with the common brake pack. A system for releasing a parking brake for a vehicle in an emergency.
The method of claim 2,
When the parking brake of the vehicle is activated,
As the fluid supply to the parking hydraulic line is released and the solenoid valve is repositioned, the fluid pressurizing the parking brake piston is drained through the parking brake release valve and the solenoid valve so that the parking brake piston is parked. Emergency release of the parking brake for a vehicle, characterized in that the close contact with the common brake pack by the elastic restoring force.
delete The method of claim 1,
On the emergency hydraulic line,
And a check valve for preventing fluid from flowing through the parking hydraulic line to the service hydraulic line.

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