CN117508127A - High-safety parking relay valve and parking braking system - Google Patents
High-safety parking relay valve and parking braking system Download PDFInfo
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- CN117508127A CN117508127A CN202311311455.0A CN202311311455A CN117508127A CN 117508127 A CN117508127 A CN 117508127A CN 202311311455 A CN202311311455 A CN 202311311455A CN 117508127 A CN117508127 A CN 117508127A
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- 238000007789 sealing Methods 0.000 claims abstract description 30
- 238000004891 communication Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/04—Driver's valves
- B60T15/12—Driver's valves combined with relay valves or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses a high-safety parking relay valve and a parking brake system, wherein the parking relay valve comprises a valve body, a piston, a mounting column, a return spring, a valve assembly and an exhaust seat; the middle part of the valve body is provided with a valve port; the return spring acts between the piston and the valve port; the valve assembly is used for opening or closing the valve port; a sealing ring is arranged between the outer wall of the piston and the inner wall of the valve body; a control cavity is formed between the upper end of the piston and the upper end of the inner wall of the valve body, and a control port is arranged at the upper end of the valve body; the lower extreme of exhaust seat is equipped with the gas vent, the outer wall of piston is equipped with the pressure release hole. When the parking state, when the hand valve gas outlet has slight leakage atmospheric pressure to get into the control mouth of parking relay valve, the gas in the air inlet of parking relay valve can not get into the gas outlet of parking relay valve, and the gas in the control mouth of parking relay valve can be discharged to the atmosphere, can prevent parking inefficacy, has realized preventing swift current car function, has improved the security performance.
Description
Technical Field
The invention relates to the technical field of automobile brake system parts, in particular to a high-safety parking relay valve and a parking brake system.
Background
The commercial vehicle braking system mainly comprises a service braking system and a parking braking system. In the existing parking braking system, the braking medium is air brake and mainly consists of a hand valve and a relay valve. When the parking cavity of the brake air chamber is in a release state, and when the parking cavity of the brake air chamber is in a parking state, the parking cavity of the brake air chamber is in a non-release state.
The specific working principle of the parking brake system in a release state is as follows: the driver pushes the hand valve, air at the air inlet of the hand valve flows to the air outlet of the hand valve and then enters the control port of the parking relay valve, and air at the air inlet of the parking relay valve flows to the air outlet of the parking relay valve and then reaches the parking cavity of the brake air chamber.
The specific working principle of the parking brake system in the parking state is as follows: the driver pushes the hand valve, the hand valve is in a closed state, air at the air inlet of the hand valve cannot flow to the air outlet of the hand valve, so that the parking relay valve is kept in a closed state, air at the air inlet of the parking relay valve cannot flow to the air outlet of the parking relay valve, and the parking cavity of the brake air chamber is in an air-free state.
Wherein the mechanical structure in the hand valve may have a potential for seal failure. When the parking state, the phenomenon that the inner of the hand valve is scratched and buckled to loosen or the sealing performance is poor occurs, gas flows to the air outlet of the hand valve from the air inlet of the hand valve, so that the control port of the parking relay valve is entered, then the valve component is pushed to be pressed down by the piston inside the parking relay valve, the gas at the air inlet of the parking relay valve is caused to enter the air outlet of the parking relay valve, and then enters the parking cavity of the brake air chamber, so that the vehicle is converted into a release state from the parking state, the parking failure is caused, if the vehicle is stopped on a road surface on a slope, the danger coefficient is higher, and the vehicle can cause safety problem due to sliding.
Disclosure of Invention
The invention aims to overcome the problems and provide a high-safety parking relay valve; when the parking state, when the hand valve gas outlet has slight leakage atmospheric pressure to get into the control mouth of parking relay valve, the gas in the air inlet of parking relay valve can not get into the gas outlet of parking relay valve, and the gas in the control mouth of parking relay valve can be discharged to the atmosphere, can prevent parking inefficacy, has realized preventing swift current car function, has improved the security performance.
Another object of the present invention is to provide a parking brake system including the above parking relay valve.
The aim of the invention is achieved by the following technical scheme:
a high-safety parking relay valve comprises a valve body, a piston, a mounting column, a return spring, a valve assembly and an exhaust seat, wherein the piston, the mounting column, the return spring and the valve assembly are arranged in the valve body, and the exhaust seat is arranged at the lower end of the valve body; wherein,
the middle part of the valve body is provided with a valve port, the piston is positioned at the upper end of the interior of the valve body, the upper end of the mounting column is movably connected with the piston, and the lower end of the mounting column penetrates through the valve port and then is connected with the exhaust seat; the return spring acts between the piston and the valve port; the valve assembly is arranged between the valve port and the exhaust seat and is used for opening or closing the valve port;
a sealing ring is arranged between the outer wall of the piston and the inner wall of the valve body, and the sealing ring is fixed on the valve body; a control cavity is formed between the upper end of the piston and the upper end of the inner wall of the valve body, a control port is arranged at the upper end of the valve body, and the control port is communicated with the control cavity; the lower end of the exhaust seat is provided with an exhaust port, the outer wall of the piston is provided with a pressure relief hole, one end of the pressure relief hole is communicated with the control cavity, and the other end of the pressure relief hole is communicated with the exhaust port when the vehicle is parked; when in a release state, the sealing ring seals the pressure relief hole;
the return spring can increase the resistance of the downward movement of the piston; when the air outlet of the hand valve has slight leakage air pressure to enter the control port of the parking relay valve in the parking state, the piston cannot move downwards under the resistance action of the return spring, and the leakage air pressure can be discharged to the atmosphere through the pressure relief hole on the piston; when the release state is changed into the parking state, the return spring can enable the piston to return completely, and the function of preventing the vehicle from sliding is maintained.
The working principle of the high-safety parking relay valve is as follows:
when the parking valve is in a parking state, when the air outlet of the hand valve slightly leaks air pressure, air in the control cavity can enter the pressure relief hole in the outer wall of the piston when entering the control cavity above the piston from the control opening, then after entering the valve body through the pressure relief hole, the air is discharged from the air outlet on the air discharging seat, namely, the air outlet is connected with the air, the piston can not move downwards to press down the valve assembly, the air inlet of the parking relay valve is prevented from entering the air outlet of the parking relay valve, the loss of the energy consumption of the air inlet of the parking relay valve is reduced, and the function of preventing a car from slipping can be realized. When releasing, the hand valve is opened, and when gas enters the control cavity above the piston from the control port, the air pressure of the control cavity can be enough to push the piston to move downwards, meanwhile, the pressure release hole can also move downwards along with the piston, the pressure release hole can be sealed on the inner wall of the sealing ring, meanwhile, the piston can downwards press the valve component, and the air inlet of the parking relay valve enters the air outlet of the parking relay valve, so that the air enters the parking cavity of the brake air chamber.
In a preferred embodiment of the present invention, the number of the pressure relief holes is plural, and the plural pressure relief holes are arranged along the circumferential direction. By arranging the plurality of pressure relief holes, the pressure for opening the parking relay valve can be increased, so that the parking relay valve needs to be opened under large pressure, when the sealing of the hand valve fails and the control cavity has large air pressure, the pressure in the control cavity can be simultaneously relieved by exhausting the air through the plurality of pressure relief holes, and the air in the control cavity is discharged out of the air outlet and enters the atmosphere; further guarantee the security of parking, prevent the vehicle swift current car.
Preferably, a step part is arranged on the piston, and an annular cavity is formed between the step part and the sealing ring; a first exhaust channel is arranged between the piston and the mounting column, and a second exhaust channel is formed among the valve assembly, the exhaust seat and the mounting column; a horizontal channel is arranged between the annular cavity and the first exhaust channel; wherein the pressure relief hole is communicated with the annular cavity; one end of the horizontal channel is communicated with the annular cavity, and the other end of the horizontal channel is communicated with the first exhaust channel; the upper end of the second exhaust passage is communicated with the lower end of the first exhaust passage, and the lower end of the second exhaust passage is communicated with the exhaust port. When the hand valve is in a parking state, when the air outlet of the hand valve has the phenomenon of air pressure leakage, air enters the control cavity above the piston from the control port, the piston slightly moves downwards, then the air enters the pressure relief hole from the control cavity, then the air sequentially passes through the annular cavity, the horizontal channel, the first exhaust channel, the valve port and the second exhaust channel, finally, the air is discharged from the air outlet, the pressure relief of the control cavity is realized, and the downward movement of the piston is avoided, so that the valve assembly is pressed downwards.
The number of the horizontal channels can be two. The purpose is to accelerate the exhaust.
Preferably, a vertical channel is arranged between the pressure release hole and the annular cavity, one end of the vertical channel is communicated with the pressure release hole, and the other end of the vertical channel is communicated with the annular cavity. The pressure relief hole and the annular cavity can be communicated by the vertical channel, and gas delivery is facilitated.
Preferably, an air outlet cavity is formed among the valve body, the sealing ring and the piston, and an air inlet cavity is formed among the valve body, the valve assembly and the exhaust seat; the valve body is provided with a valve body air inlet and a valve body air outlet; the air inlet cavity is communicated with the air inlet of the valve body, and the air outlet cavity is communicated with the air outlet of the valve body; the air outlet cavity is also communicated with the valve port. The air inlet of the valve body is an air inlet of the parking relay valve, and the air outlet of the valve body is an air outlet of the parking relay valve. In the structure, when the valve is released, a driver pushes the hand valve, air at the air inlet of the hand valve flows to the air outlet of the hand valve and then enters the control port of the parking relay valve, so that the air enters the control cavity for collection, the piston is pushed to move downwards under the action of high pressure of the air against the elasticity of the return spring, the pressure release hole is closed by the sealing ring, the valve component is pressed down by the lower end of the piston, and the valve port is opened by the valve component; the air inlet cavity is communicated with the air outlet cavity through the valve port, and air at the air inlet of the valve body enters the air inlet cavity, passes through the valve port and then enters the air outlet cavity, and then enters the parking cavity reaching the brake air chamber from the air outlet of the valve body. When the valve assembly is pressed down by the lower end of the piston, the lower end of the piston is sealed with the valve assembly, the communication between the valve port and the first exhaust channel is blocked, and the communication between the valve port and the second exhaust channel is blocked, so that the first exhaust channel and the second exhaust channel are directly communicated, gas in the valve port cannot enter the first exhaust channel and the second exhaust channel, and the gas in the gas outlet cavity and the gas inlet cavity cannot be discharged out of the atmosphere.
Preferably, the valve assembly comprises a valve and a valve spring arranged between the valve and the exhaust seat, wherein the upper end of the valve spring acts on the valve, the lower end acts on the exhaust seat, and the elastic force of the valve spring promotes the valve to close the valve port. When the parking device is in parking, the elastic force of the valve spring acts on the valve, so that the valve is abutted against the valve port of the valve body, the valve is closed, the communication between the air inlet cavity and the air outlet cavity is blocked, the air in the air inlet cavity cannot enter the air outlet cavity, and the parking cavity of the brake air chamber is in an air-free state.
Preferably, the valve body comprises an upper valve body and a lower valve body, and the sealing ring is fixed between the upper valve body and the lower valve body, and the purpose of the valve body is to facilitate the installation and fixation of the sealing ring.
Preferably, the number of the air outlets of the valve body is two. Through setting up two valve body gas outlets, can communicate the parking chamber of two brake air chambers, two brake air chambers are used for the braking and the parking of two wheels about the vehicle respectively.
Preferably, an orifice is arranged on the piston, one end of the orifice is communicated with the control cavity, and the other end of the orifice is communicated with the air outlet cavity.
A parking brake system comprises a parking air cylinder, a hand valve, the parking relay valve and a brake air chamber; the hand valve is provided with a hand valve air inlet and a hand valve air outlet, the parking air cylinder is respectively communicated with the hand valve air inlet and the valve body air inlet, the hand valve air outlet is communicated with the control port, the number of the braking air chambers is two, and the parking cavities of the two braking air chambers are communicated with the two valve body air outlets in a one-to-one correspondence manner.
The working principle of the parking brake system is as follows:
the parking gas receiver stores gas, so that the air outlet of the hand valve and the air inlet of the valve body can be kept in an air-holding state. When the vehicle is in a release state, a driver pushes the hand valve, the hand valve is opened, air at the air inlet of the hand valve flows to the air outlet of the hand valve and then enters the control port of the parking relay valve, the air pushes the piston to press down the valve assembly, the valve port is opened, the air inlet of the valve body is communicated with the air outlet of the valve body, the air at the air inlet of the valve body enters the air outlet of the valve body and then enters the parking cavity of the brake air chamber, and the vehicle enters the release state.
When in a parking state, a driver pushes the hand valve, the hand valve is in a closed state, air at the air inlet of the hand valve cannot flow to the air outlet of the hand valve, so that the piston does not work, the valve port is in a closed state, air at the air inlet of the valve body cannot flow to the air outlet of the valve body, and the parking cavity of the brake air chamber is in an air-free state, so that the vehicle is converted into a parking state from a release state. When in a parking state, when the air outlet of the hand valve slightly leaks air pressure, the air can be discharged out of the atmosphere through the pressure relief hole, so that the piston does not press down the valve assembly in the parking state, and the vehicle is prevented from being converted into a release state from the parking state, and the aim of preventing the vehicle from sliding is fulfilled.
Preferably, the parking air cylinder is connected with an air inlet pipeline which is connected to the hand valve air inlet and the valve body air inlet in a one-to-two way mode; the air outlet of the hand valve is communicated with the control port through a control pipeline; the parking cavity of the brake chamber is communicated with the air outlet of the valve body through an air outlet pipeline.
Compared with the prior art, the invention has the following beneficial effects:
according to the parking relay valve, the problem of sliding caused by sealing failure of the hand valve is solved, the pressure release hole is formed in the piston, when the air outlet of the hand valve slightly leaks air pressure to enter the control cavity above the piston through the control port during parking, air in the control cavity can enter the air outlet through the pressure release hole and is discharged out of the atmosphere, the piston cannot be pressed down on the valve assembly, closing of the valve port in a parking state is guaranteed, parking failure can be prevented, a sliding prevention function is achieved, and safety performance is improved.
Drawings
Fig. 1 is a schematic diagram of one embodiment of a high safety park relay valve according to the present invention.
Fig. 2 and 3 are partial enlarged views of a part of the structure of fig. 1.
Fig. 4 is a schematic diagram of the flow of gas in the event of a manual valve seal failure for the park relay valve of the present invention, wherein the arrows indicate the direction of gas flow.
Fig. 5-6 are perspective views of the piston of the present invention from different viewing directions.
Fig. 7 is a schematic view of the internal structure of the piston in the present invention.
Fig. 8 is a schematic view of another embodiment of the parking relay valve of the present invention.
Fig. 9 is a schematic view of a parking brake system according to the present invention in a parking state.
Fig. 10 is a schematic view showing a structure of the parking brake system in a released state according to the present invention.
Detailed Description
In order that those skilled in the art will well understand the technical solutions of the present invention, the following describes the present invention further with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
Example 1
Referring to fig. 1-3, the present embodiment discloses a high safety parking relay valve 1, which comprises a valve body 2, a piston 3 arranged in the valve body 2, a mounting column 4, a return spring 5, a valve assembly 6, and an exhaust seat 7 arranged at the lower end of the valve body 2.
Referring to fig. 1-3, a valve port 8 is provided in the middle of the valve body 2, the piston 3 is located at the upper end inside the valve body 2, the upper end of the mounting column 4 is movably connected with the piston 3, and the lower end of the mounting column 4 passes through the valve port 8 and is connected with the exhaust seat 7; the return spring 5 acts between the piston 3 and the valve port 8; the valve assembly 6 is arranged between the valve port 8 and the exhaust seat 7, and is used for opening or closing the valve port 8.
Referring to fig. 1-3 and 5-7, a sealing ring 9 is arranged between the outer wall of the piston 3 and the inner wall of the valve body 2, and the sealing ring 9 is fixed on the valve body 2; a control cavity 10 is formed between the upper end of the piston 3 and the upper end of the inner wall of the valve body 2, a control port 11 is arranged at the upper end of the valve body 2, and the control port 11 is communicated with the control cavity 10; the lower end of the exhaust seat 7 is provided with an exhaust port 12, and the exhaust port 12 is communicated with the atmosphere; the outer wall of the piston 3 is provided with a pressure relief hole 13, one end of the pressure relief hole 13 is communicated with the control cavity 10 when in a parking state, and the other end of the pressure relief hole is communicated with the exhaust port 12; in the released state, the sealing ring 9 seals the pressure relief hole 13.
The return spring 5 can increase the downward movement resistance of the piston 3 (in the parking state, when the air pressure slightly leaks from the air outlet 25-2 of the hand valve to enter the control port 11 of the parking relay valve, the piston 3 cannot move downward under the action of the resistance of the return spring 5, and the leaked air pressure can be discharged to the atmosphere through the pressure release hole 13 on the piston 3); meanwhile, when the release state is changed into the parking state, the piston 3 can be completely reset under the action of the return spring 5, so that the anti-slip function is maintained.
Referring to fig. 1 to 7, the number of the pressure relief holes 13 is plural, and the plurality of pressure relief holes 13 are arranged along the circumferential direction. By arranging the plurality of pressure relief holes 13, the pressure for opening the parking relay valve 1 can be increased, so that the parking relay valve 1 in the embodiment needs to be opened under large pressure, and when the seal of the hand valve 25 fails and the control cavity 10 has large air pressure, the plurality of pressure relief holes 13 can be used for simultaneously exhausting and relieving the pressure, and the air in the control cavity 10 is discharged out of the air outlet 12 and enters the atmosphere; further guarantee the security of parking, prevent the vehicle swift current car.
Referring to fig. 5 to 6, the number of the pressure release holes 13 in the present embodiment is six, and the parking relay valve 1 is opened under high pressure by the six pressure release holes 13, and the safety of the parking state is improved.
Referring to fig. 1-7, the piston 3 is provided with a step part 3-1, and an annular cavity 14 is formed between the step part 3-1 and the sealing ring 9; a first exhaust passage 15 is arranged between the piston 3 and the mounting column 4, and a second exhaust passage 16 is formed among the valve assembly 6, the exhaust seat 7 and the mounting column 4; a horizontal channel 17 is arranged between the annular cavity 14 and the first exhaust channel 15; wherein the pressure relief hole 13 is communicated with the annular cavity 14; one end of the horizontal channel 17 is communicated with the annular cavity 14, and the other end is communicated with the upper end of the first exhaust channel 15; the upper end of the second exhaust passage 16 communicates with the lower end of the first exhaust passage 15, and the lower end of the second exhaust passage 16 communicates with the exhaust port 12. When the hand valve air outlet 25-2 leaks air pressure during parking, air enters the control cavity 10 above the piston 3 from the control port 11, the piston 3 slightly moves downwards, then the air enters the pressure relief hole 13 from the control cavity 10, then the air sequentially passes through the annular cavity 14, the horizontal channel 17, the first air exhaust channel 15, the valve port 8 and the second air exhaust channel 16, and finally the air is exhausted from the air exhaust port 12, so that the pressure relief of the control cavity 10 is realized, and the downward movement of the piston 3 to press the valve assembly 6 is avoided.
Further, a groove body is formed on the inner wall of the piston 3 or the outer wall of the mounting post 4, so that a first exhaust channel 15 can be formed.
Referring to fig. 1-7, a vertical channel 18 is arranged between the pressure release hole 13 and the annular cavity 14, one end of the vertical channel 18 is communicated with the pressure release hole 13, and the other end is communicated with the annular cavity 14. The purpose is that through setting up vertical passageway 18, can communicate relief hole 13 and annular chamber 14, do benefit to gas delivery.
The vertical channel 18 is perpendicular to the pressure release hole 13, and is convenient for processing.
Referring to fig. 1-7, the pressure relief hole 13, the vertical channel 18, the annular cavity 14, the horizontal channel 17, the first exhaust channel 15, the valve port 8 and the second exhaust channel 16 form a flow guiding structure, and the gas discharge of the control cavity 10 is realized through the flow guiding structure.
Referring to fig. 1-3 and 9-10, an air outlet cavity 19 is formed between the valve body 2, the sealing ring 9 and the piston 3, and an air inlet cavity 20 is formed between the valve body 2, the valve assembly 6 and the exhaust seat 7; the valve body 2 is provided with a valve body air inlet 22 and a valve body air outlet 21; the air inlet cavity 20 is communicated with the valve body air inlet 22, and the air outlet cavity 19 is communicated with the valve body air outlet 21; the outlet chamber 19 is also in communication with the valve port 8. The valve body air inlet 22 is an air inlet of the parking relay valve 1, and the valve body air outlet 21 is an air outlet of the parking relay valve 1. In the structure, when the valve is released, a driver pushes the hand valve 25, air at the air inlet 25-1 of the hand valve flows to the air outlet 25-2 of the hand valve and then enters the control port 11 of the parking relay valve 1, so that the air enters the control cavity 10 for collection, under the action of high pressure of the air, the piston 3 is pushed to move downwards against the elastic force of the return spring 5, the sealing ring 9 closes the pressure relief hole 13, the lower end of the piston 3 presses the valve component 6 downwards, and the valve component 6 opens the valve port 8; the air inlet cavity 20 is communicated with the air outlet cavity 19 through the valve port 8, and air in the air inlet 22 of the valve body enters the air inlet cavity 20, passes through the valve port 8, enters the air outlet cavity 19, and then enters the parking cavity 26-1 reaching the brake air chamber 26 from the air outlet 21 of the valve body. When the lower end of the piston 3 presses down the valve assembly 6, the lower end of the piston 3 is sealed with the valve assembly 6, the communication between the valve port 8 and the first exhaust channel 15 is blocked, and the communication between the valve port 8 and the second exhaust channel 16 is blocked, so that the first exhaust channel 15 and the second exhaust channel 16 are directly communicated, gas in the valve port 8 cannot enter the first exhaust channel 15 and the second exhaust channel 16, and the gas in the gas outlet cavity 19 and the gas inlet cavity 20 cannot be discharged out of the atmosphere.
Referring to fig. 1-3, a gap 23 is provided between the outer wall of the piston 3 and the inner wall of the valve body 2, and the gap 23 is communicated with the pressure release hole 13 when the vehicle is parked. In the parking state, when the hand valve 25 fails in sealing, gas entering the control chamber 10 enters the pressure relief hole 13 from the gap 23. The upper end of the sealing ring 9 can seal the gap 23 to prevent gas in the gap 23 from entering the gas outlet cavity 19, and the lower end of the sealing ring 9 also seals the annular cavity 14 to prevent gas in the gas outlet cavity 19 from entering the annular cavity 14 in a release state.
Referring to fig. 1-3, the valve assembly 6 includes a valve 6-1 and a valve spring 6-2 disposed between the valve 6-1 and the exhaust seat 7, wherein an upper end of the valve spring 6-2 acts on the valve 6-1 and a lower end acts on the exhaust seat 7, and the valve spring 6-2 urges the valve 6-1 to close the valve port 8. When the automobile is parked, the elastic force of the valve spring 6-2 acts on the valve 6-1, so that the valve 6-1 is abutted against the valve port 8 of the valve body 2, the valve 6-1 is closed, the communication between the air inlet cavity 20 and the air outlet cavity 19 is blocked, the air in the air inlet cavity 20 cannot enter the air outlet cavity 19, and the parking cavity 26-1 of the brake air chamber 26 is guaranteed to be in an air-free state.
Referring to fig. 1-3, the valve body 2 includes an upper valve body 2-1 and a lower valve body 2-2, and the middle part of the sealing ring 9 is fixed between the upper valve body 2-1 and the lower valve body 2-2, so as to facilitate the installation and fixation of the sealing ring 9.
Referring to fig. 1-3, the number of the valve body air outlets 21 is two. By providing two valve body air outlets 21, the parking cavity 26-1 of two brake air chambers 26 can be communicated, and the two brake air chambers 26 are respectively used for braking and parking of the left and right wheels of the vehicle.
Referring to fig. 5-7, the lower end of the piston 3 is provided with an extension portion 3-2, and when released, the lower end of the extension portion 3-2 abuts against the valve 6-1. The piston 3 is also provided with a mounting groove 3-3 for mounting the return spring 5. The aim is to make the structure more compact.
Referring to fig. 1 to 7 and 9 to 10, the above-described high-safety parking relay valve 1 operates on the principle that:
when the hand valve air outlet 25-2 slightly leaks air pressure during parking, air enters the control cavity 10 above the piston 3 from the control port 11, the air in the control cavity 10 can enter the pressure relief hole 13 on the outer wall of the piston 3, then after entering the valve body 2 through the pressure relief hole 13, the air is discharged from the air outlet 12 on the air discharging seat 7, namely, the air outlet 12 is connected with the air, the piston 3 cannot move downwards to press the valve assembly 6, the air inlet (namely, the valve body air inlet 22) of the parking relay valve 1 is prevented from entering the air outlet (namely, the valve body air outlet 21) of the parking relay valve 1, the loss of the air inlet energy consumption of the parking relay valve 1 is reduced, and the function of preventing a car from sliding can be realized. When releasing, hand valve 25 is opened, when gas gets into the control chamber 10 of piston 3 top from control port 11, the atmospheric pressure of control chamber 10 can be enough big, promote piston 3 downward movement, pressure release hole 13 also can be along with piston 3 downward movement simultaneously, pressure release hole 13 can seal in the inner wall of sealing washer 9, simultaneously, piston 3 pushes down valve assembly 6 down, the air inlet gas of parking relay valve 1 enters into the gas outlet of parking relay valve 1, and then get into the parking chamber 26-1 of brake chamber 26, consequently, through setting up pressure release hole 13, do not influence the gas outlet normal pressure building of parking relay valve 1, do not influence the normal release of vehicle.
Example 2
Referring to fig. 8, the other structure in this embodiment is the same as that of embodiment 1, except that an orifice 30 is provided on the piston 3, one end of the orifice 30 communicates with the control chamber 10, and the other end communicates with the air outlet chamber 19. The orifice 30 is provided to provide an air flow buffer function. In the parking state, when the air pressure slightly leaks from the air outlet 25-2 of the hand valve to enter the control port 11 of the parking relay valve, the air flow will be preferentially discharged to atmosphere toward the throttle hole 30 (the air of the throttle hole 30 is finally discharged to atmosphere from the air outlet 12), and then the air flow will be discharged to atmosphere toward the pressure release hole 13 on the side edge of the piston 3, so that the rapid downward pressing movement of the piston 3 is avoided due to the air flow buffering effect, and the pressure release hole 13 fully plays a role. On the other hand, the braking time can be delayed. When the control pipeline 28 from the hand valve air outlet 25-2 to the control port 11 falls off in the release state, the air pressure at the control port 11 of the parking relay valve is also discharged to the atmosphere, the piston 3 moves upwards, and the air pressure at the air outlet (the air outlet 21 of the valve body) of the parking relay valve is also discharged to the atmosphere, so that parking is caused. Due to the action of the throttle hole 30, the air pressure of the air outlet pipeline 29 of the parking relay valve can slowly compensate the control cavity 10 through the throttle hole 30 on the piston 3, so that the vehicle can not park rapidly, and the effect of slow braking is achieved.
Example 3
Referring to fig. 1-3 and 9-10, the present embodiment discloses a parking brake system including a parking reservoir 24, a hand valve 25, a parking relay valve 1 as described in example 1 or 2, and a brake chamber 26; the hand valve 25 is provided with a hand valve air inlet 25-1 and a hand valve air outlet 25-2, the parking air cylinder 24 is respectively communicated with the hand valve air inlet 25-1 and the valve body air inlet 22, the hand valve air outlet 25-2 is communicated with the control port 11, the number of the two braking air chambers 26 is two, and the parking cavities 26-1 of the two braking air chambers 26 are correspondingly communicated with the two valve body air outlets 21 one by one.
Referring to fig. 1-3 and 9-10, an air inlet pipe 27 is connected to the parking air cylinder 24, and the air inlet pipe 27 is connected to the hand valve air inlet 25-1 and the valve body air inlet 22 in two paths; the hand valve air outlet 25-2 is communicated with the control port 11 through a control pipeline 28; the parking cavity 26-1 of the brake chamber 26 is communicated with the valve body air outlet 21 through an air outlet pipeline 29.
Referring to fig. 1 to 3 and 9 to 10, the above parking brake system operates according to the following principle:
the parking cylinder 24 stores gas so that the hand valve outlet 25-2 and the valve body inlet 22 are kept in a gas-filled state. When in a release state, a driver pushes the hand valve 25, the hand valve 25 is opened, air in the hand valve air inlet 25-1 flows to the hand valve air outlet 25-2 and then enters the control port 11 of the parking relay valve 1, the air pushes the piston 3 to press down the valve assembly 6, the valve port 8 is opened, the valve body air inlet 22 is communicated with the valve body air outlet 21, air in the valve body air inlet 22 enters the valve body air outlet 21 and then enters the parking cavity 26-1 of the brake air chamber 26, and the vehicle enters the release state.
When in a parking state, a driver pushes the hand valve 25, the hand valve 25 is in a closed state, air in the hand valve air inlet 25-1 does not flow to the hand valve air outlet 25-2, so that the piston 3 does not work, the valve port 8 is in a closed state, air in the valve body air inlet 22 does not flow to the valve body air outlet 21, the parking cavity 26-1 of the brake air chamber 26 is in an air-free state, and the vehicle is converted into a parking state from a released state. When the hand valve air outlet 25-2 has slight leakage air pressure in the parking state, the pressure relief hole 13 can discharge air out of the atmosphere, so that the piston 3 can not downwards press the valve assembly 6 in the parking state, and the vehicle is prevented from being converted into a release state from the parking state, thereby achieving the purpose of preventing the vehicle from sliding.
In fig. 9 and 10, the black color of the pipes (the inlet pipe 27, the control pipe 28, and the outlet pipe 29) is represented as a gas state, and the white color is represented as a gas-free state.
The foregoing is illustrative of the present invention, and is not to be construed as limiting thereof, but rather as various changes, modifications, substitutions, combinations, and simplifications which may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The high-safety parking relay valve is characterized by comprising a valve body, a piston, a mounting column, a return spring, a valve assembly and an exhaust seat, wherein the piston, the mounting column, the return spring and the valve assembly are arranged in the valve body, and the exhaust seat is arranged at the lower end of the valve body; wherein,
the middle part of the valve body is provided with a valve port, the piston is positioned at the upper end of the interior of the valve body, the upper end of the mounting column is movably connected with the piston, and the lower end of the mounting column penetrates through the valve port and then is connected with the exhaust seat; the return spring acts between the piston and the valve port; the valve assembly is arranged between the valve port and the exhaust seat and is used for opening or closing the valve port;
a sealing ring is arranged between the outer wall of the piston and the inner wall of the valve body, and the sealing ring is fixed on the valve body; a control cavity is formed between the upper end of the piston and the upper end of the inner wall of the valve body, a control port is arranged at the upper end of the valve body, and the control port is communicated with the control cavity; the lower end of the exhaust seat is provided with an exhaust port, the outer wall of the piston is provided with a pressure relief hole, one end of the pressure relief hole is communicated with the control cavity, and the other end of the pressure relief hole is communicated with the exhaust port when the vehicle is parked; when in a release state, the sealing ring seals the pressure relief hole;
the return spring can increase the resistance of the downward movement of the piston; when the air outlet of the hand valve has slight leakage air pressure to enter the control port of the parking relay valve in the parking state, the piston cannot move downwards under the resistance action of the return spring, and the leakage air pressure can be discharged to the atmosphere through the pressure relief hole on the piston; when the release state is changed into the parking state, the return spring can enable the piston to return completely, and the function of preventing the vehicle from sliding is maintained.
2. The high safety parking relay valve according to claim 1, wherein the number of the relief holes is plural, and the plurality of relief holes are arranged in a circumferential direction.
3. The high safety parking relay valve according to claim 1, wherein a step portion is provided on the piston, and an annular cavity is formed between the step portion and the seal ring; a first exhaust channel is arranged between the piston and the mounting column, and a second exhaust channel is formed among the valve assembly, the exhaust seat and the mounting column; a horizontal channel is arranged between the annular cavity and the first exhaust channel; wherein the pressure relief hole is communicated with the annular cavity; one end of the horizontal channel is communicated with the annular cavity, and the other end of the horizontal channel is communicated with the first exhaust channel; the upper end of the second exhaust passage is communicated with the lower end of the first exhaust passage, and the lower end of the second exhaust passage is communicated with the exhaust port.
4. A high safety parking relay valve according to claim 3, wherein a vertical passage is provided between the pressure relief hole and the annular chamber, one end of the vertical passage being in communication with the pressure relief hole and the other end being in communication with the annular chamber.
5. The high safety park relay valve of claim 1, wherein an air outlet chamber is formed between the valve body, the sealing ring and the piston, and an air inlet chamber is formed between the valve body, the valve assembly and the exhaust seat; the valve body is provided with a valve body air inlet and a valve body air outlet; the air inlet cavity is communicated with the air inlet of the valve body, and the air outlet cavity is communicated with the air outlet of the valve body; the air outlet cavity is also communicated with the valve port.
6. The high safety park relay valve of claim 1, wherein the valve assembly comprises a valve and a valve spring disposed between the valve and the exhaust seat, wherein an upper end of the valve spring acts on the valve and a lower end acts on the exhaust seat, and wherein the valve spring force urges the valve to close the valve port.
7. The high safety park relay valve of claim 1, wherein the valve body comprises an upper valve body and a lower valve body, and wherein the sealing ring is secured between the upper and lower valve bodies.
8. The high safety park relay valve of claim 5, wherein the piston is provided with an orifice having one end in communication with the control chamber and the other end in communication with the air outlet chamber.
9. A parking brake system comprising a parking reservoir, a hand valve, a parking relay valve according to any one of claims 1-8, and a brake chamber; the hand valve is provided with a hand valve air inlet and a hand valve air outlet, the parking air cylinder is respectively communicated with the hand valve air inlet and the valve body air inlet, the hand valve air outlet is communicated with the control port, the number of the braking air chambers is two, and the parking cavities of the two braking air chambers are communicated with the two valve body air outlets in a one-to-one correspondence manner.
10. A parking brake system according to claim 9, wherein the parking cylinder is connected to an air intake duct which is connected to the hand valve air inlet and the valve body air inlet in two parts; the air outlet of the hand valve is communicated with the control port through a control pipeline; the parking cavity of the brake chamber is communicated with the air outlet of the valve body through an air outlet pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311311455.0A CN117508127A (en) | 2023-10-11 | 2023-10-11 | High-safety parking relay valve and parking braking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311311455.0A CN117508127A (en) | 2023-10-11 | 2023-10-11 | High-safety parking relay valve and parking braking system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117508127A true CN117508127A (en) | 2024-02-06 |
Family
ID=89757412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311311455.0A Pending CN117508127A (en) | 2023-10-11 | 2023-10-11 | High-safety parking relay valve and parking braking system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117508127A (en) |
-
2023
- 2023-10-11 CN CN202311311455.0A patent/CN117508127A/en active Pending
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