CN102466046A - Air return valve for inner air return independent discharge spring braking air chamber - Google Patents
Air return valve for inner air return independent discharge spring braking air chamber Download PDFInfo
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- CN102466046A CN102466046A CN2010105448092A CN201010544809A CN102466046A CN 102466046 A CN102466046 A CN 102466046A CN 2010105448092 A CN2010105448092 A CN 2010105448092A CN 201010544809 A CN201010544809 A CN 201010544809A CN 102466046 A CN102466046 A CN 102466046A
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Abstract
The invention relates to the technical field of automobile parts, in particular to an air return valve for an inner air return independent discharge spring braking air chamber to solve the problem that external harmful substance enters and damages a cylinder body, so the service life of an energy storage cavity is threatened seriously. The air return valve is characterized in that through holes are formed in a valve seat in an axial direction; hole steps are arranged in the through holes; valve ports are formed at the hole steps; axial air holes are formed between the valve ports and a cylinder wall of the valve seat in the axial direction; the end of the cylinder wall of the valve seat is provided with radial air holes which are vertical to the axial air holes; a valve bush and a valve are arranged in a large-diameter through hole, facing the hole steps, in the valve seat; one end of the valve is adhered to the valve ports, and the other end of the valve is in fit with inner holes formed in the valve bush in the axial direction; valve springs are arranged in the valve; a valve plug is arranged at the end of a small-diameter through, facing the hole steps, in the valve seat; and one end, facing the valve, of the valve plug is provided with a flow guide hole. A piston assembly end cover is saved, the inner space is fully utilized, the air return valve is sealed reliably and a sealing component is not damaged.
Description
Technical field
The present invention relates to technical field of automobile components, relate in particular to the return air valve of the inner return-air independence emission type spring braking air chamber in a kind of brake system of car.
Background technique
The application of all kinds of medium and heavy load vehicle upper spring brake chambers has not only guaranteed the safety of vehicle driving braking, and has improved the stability of vehicle parking and the reliability of emergency braking.
The vehicle of cruising need slow down or when stopping to go; Under the effect of brake control valve, the pressurized air of system gets into the service brake chamber by the service brake suction port, promotes thrust disc and travels forward; Convert air pressure into mechanical energy by break, make vehicle be able to slow down or stop to go.Meanwhile, the volume of service brake common pressure chamber constantly reduces, and the air that reduces volume outwards discharges through the vent on the service brake common pressure chamber, makes the service brake common pressure chamber keep atmospheric pressure state; When the vehicle that goes need be removed service brake, under the effect of brake control valve, the pressurized air in service brake chamber is system by the road; Outwards discharge by brake valve; Thrust disc is returned to the zero stroke position rapidly under the effect of return spring, the braking of moving vehicle is able to remove; The service brake common pressure chamber keeps normal pressure through vent, and the service brake chamber keeps normal pressure through brake valve and pipe-line system.
When vehicle need carry out parking braking or emergency braking; Under the effect of manual braking member, the pressurized air in parking braking chamber 20 is handled control elements and is outwards discharged; The pressure of energy-storaging spring is released; Promotion piston rod, thrust disc travel forward, and by break spring pressure are converted into mechanical energy, make vehicle implementation parking braking or emergency braking.Meanwhile, along with the realization of Parking or emergency braking, the volume of spring chamber constantly increases, and the air that increases volume is through muffler, and the air suction of service brake common pressure chamber is additional, makes spring chamber keep atmospheric pressure state; When Parking or emergency braking need be removed; Under the effect of manual element; The pressurized air of system gets into parking braking chamber 20 through the parking braking suction port, makes the energy-storaging spring compression, and return spring promotes thrust disc along with piston rod return together; Parking braking or Emergency Negative Thrust are able to loosen, and vehicle braked is removed.Meanwhile, the volume of spring chamber reduces, and the air that reduces volume outwards discharges through the service brake common pressure chamber through muffler, makes spring chamber keep atmospheric pressure state.This return-air, the scavenging action of muffler make vehicle can normally realize service brake, parking braking or emergency braking just.This muffler is connecting the common pressure chamber of service brake and the spring chamber of parking braking; That is to say that two chambeies communicate with the external world through aperture, because the working environment of vehicle exists soil such as mud, sewage, dust, the grains of sand, vehicle is when carrying out parking braking or emergency braking; Soil and so on is prone to through the common pressure chamber of service brake, the spring chamber that muffler is inhaled into parking braking; Along with the passing of service time of spring braking air chamber, the booty alluvial is at the spring chamber of spring braking air chamber, and the alluvial of booty produces harm to parking braking; Produce corrosion like the spring inboard wall of cylinder block, braking ability was lost efficacy; The spring inboard wall of cylinder block produces wearing and tearing and pulls, and braking ability was lost efficacy; Piston Y shape circle premature wear lost efficacy braking ability; Lubricating grease mixes generation dirt knot in stolen goods dirt and the cylinder body, and braking ability was lost efficacy.
People design again like patent announcement and number are the improvement of CN2846243Y internal respiration formula spring braking air chamber; Be primarily characterized in that piston rod in rear gas chamber's housing penetrates the diaphragm type piston and be connected back formation piston assembly with push-plate; The edge of diaphragm type piston is by rear gas chamber's housing and middle shell pressing sealing when being connected, and the shell wall of rear gas chamber's housing is closed, is provided with the gas passage in the piston rod; Respiratory cavity communicates with venting cavity through the gas passage in the piston rod; Venting cavity communicates with pneumostome, and storage presses the chamber to communicate with gas port, and this device is established an one-way valve in the end of piston rod; The defective of one-way valve be to rely on piston rod surmount on the body sealing O shape enclose and realize air inlet and exhaust, exist and must Packedly replenish.
Summary of the invention
The objective of the invention is in order to solve following problem; Promptly when carrying out parking braking and braking releasing, replenishing, discharging of accumulation of energy chamber air all is direct and external world's exchange through cylinder body, because the exchange of air is open; Can't well effectively protect the accumulation of energy chamber; Extraneous harmful substance gets into cylinder body inevitably, and cylinder body is produced destruction, the serious working life that is threatening the accumulation of energy chamber.A kind of spring braking air chamber structure of inner return-air independence emission type is provided; Utilize in the spring braking air chamber and establish return air valve; It has cancelled muffler, and the parking braking spring chamber no longer links to each other with the common pressure chamber of service brake, no longer is designed with return-air hole on the parking braking cylinder body; Cylinder body does not communicate with the external world, avoids extraneous booty to be drawn into spring chamber.
Above-mentioned technical problem of the present invention mainly is able to solve through following technical proposals: a kind of return air valve of inner return-air independence emission type spring braking air chamber, comprise valve seat, spool, and it is characterized in that described valve seat axially is through hole; Be provided with shoulder hole in the through hole; The shoulder hole place is provided with valve port, is axially arranged with axial pore between valve port and the valve seat barrel, and the barrel end of valve seat is provided with and the axial vertical radially pore of pore; In the diameter through hole at shoulder hole place, valve pocket and valve are housed in the valve seat; One end of valve and valve port are fitted, and the other end of valve cooperates with the endoporus that valve pocket is axially arranged with, and is provided with valve spring in the valve; Spool is arranged in the valve seat towards an end of the minor diameter through hole at shoulder hole place, and spool is provided with pod apertures towards an end of valve.
Shoulder hole in the through hole promptly is formed by connecting large diameter hole and small diameter bore; Valve port is a toroidal surface; Toroidal surface is positioned on the step end face of large diameter hole and small diameter bore jointing place; Axially pore is arranged in the circular groove bigger than step end face diameter, and this circular groove is just between valve port and valve seat barrel.Axially pore is made up of several little minute hole, and axially pore leads to the end of valve seat, so also makes easily.Radially circumference is provided with pore along the valve seat end, and air leads to the other end of valve seat to axial pore from pore radially.Valve pocket is fixed in the valve seat; Valve pocket provides the fixed position of valve spring one end and the pilot hole that valve moves; Valve pocket provides air to get into the passage of piston rod cavity from pore radially simultaneously, when an end and the valve port of valve is closed, just stops air from pore entering piston rod cavity radially.Valve spring is a pressure spring, and when valve spring was in the nature extended configuration, valve and valve port were closed.Axially move each other between spool and the valve seat during work, when an end pod apertures that in valve seat, moves to spool when spool surpassed valve port, air was from getting into the passage of piston rod cavity through pod apertures from pore radially.
As preferably, an end of described spool is a flange body, and the other end is a cylindrical body; Cylindrical external diameter cooperates with minor diameter through hole one end at valve seat shoulder hole place; Cylindrical end face is main end face, and the end face of flange body and cylindrical body connecting part is a confined planes, and the length of confined planes to main end face is greater than the length of valve port to the valve seat end face; When confined planes and valve seat were adjacent to, axially pore communicated with pod apertures.The end face of flange body is secondary face, and secondary face pastes with diaphragm mutually during work, and described diaphragm is the barrier film between spring braking air chamber common pressure chamber and the service brake chamber.Confined planes guarantees that air exceeds valve port and communicates from pore radially from pod apertures when radially pore gets into piston rod cavity.
As preferably, described valve seat with endoporus that the spool cylindrical body cooperates in be provided with second inner seal ring, the external diameter of valve seat is provided with connecting thread, connecting thread is provided with second exterior seal ring towards an end position of pore direction radially.Because axially the port of pore is towards the spool direction,, prevent that gas is from both cooperation places entering valves so be provided with second inner seal ring between spool cylindrical body and the endoporus that valve seat cooperates.Connecting thread is a kind of Placement of the piston rod in valve seat and the piston assembly, and second exterior seal ring prevents that gas from getting into the piston rod cavity through the screw thread space from the service brake chamber.
As preferably; Described axial pore is provided with several, and axially pore leads to the diameter through hole position, shoulder hole place in the valve seat, and radially pore is provided with several along valve seat external diameter circumference; Radially pore communicates with axial pore, and radially the external port of pore communicates with the service brake chamber.Axially pore is lower than valve port plane towards valve port one end, can not influence when valve and valve port are fitted to seal, and radially pore is processed with axial pore simultaneously, radially pore and service brake chamber normal open.
As preferably, an end of described valve spring is positioned on the end face that the endoporus of valve pocket is axially arranged with, and the other end of valve spring is positioned in the spring base hole in the valve endoporus.One end of valve pocket is established a spring seat, and the spring seat middle part is middle through hole, and valve spring is a volute spring.
As preferably, the end that described valve and valve port are fitted is provided with diaphragm seal, on the valve at the central shaft that is provided with diaphragm seal one end to being the air inlet center hole.Diaphragm seal is fixed on the end of valve, and the diaphragm seal axial centre is vent equally.
As preferably; One end of described valve pocket axial centre is provided with middle through hole; Be provided with seal in first in valve pocket and the endoporus that valve cooperates, the external diameter of valve pocket is provided with outer channel, is provided with the first outer seal in the outer channel; The external diameter of valve pocket cooperates with the endoporus of valve seat, and the axial of valve pocket is fixed in the endoporus of valve seat with back-up ring through the hole.It is motionless to interfix between valve pocket and the valve seat, and an end cylindrical body of valve moves in valve pocket, and interior seal cover one guarantees that air can directly not get into the piston rod cavity valve and valve pocket endoporus transition fit from axial pore when valve and valve port applying.
Effective effect of the present invention is: cancelled traditional product piston assembly end cap; Make full use of the inner space of product, sealability is reliable, does not have the destructive damage of seal element; Vehicle is in realizing the process that parking braking and braking are removed; Avoid the suction of soil, guaranteed the Security that product uses, the working life of having improved product.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention.
Fig. 2 is a kind of valve seat construction schematic representation of the present invention.
Fig. 3 is a kind of valve pocket structural representation of the present invention.
Fig. 4 is a kind of valve mechanism schematic representation of the present invention.
Fig. 5 is a kind of valve core structure schematic representation of the present invention.
Fig. 6 is a kind of driving states structural representation of the present invention.
Fig. 7 is a kind of parking braking of the present invention, braking relieving state structural representation.
Fig. 8 is a kind of working state schematic representation of the present invention in the spring braking chamber.
Among the figure: 1. valve seat, 101. positioning ring grooves, 102. valve ports, 103. connecting threads, 104. axial pores, 105. radially pore, 2. valve pockets; 201. middle through hole, 202. outer channel, 3. seal in first, 4. back-up ring is used in the hole, the 5. first outer seal, 6. valve, 601. spring base holes; 602. diaphragm seal, 603. air inlet center holes, 7. spool, 701. flange bodies, 702. secondary faces, 703. confined planes; 704. main end face, 705. pod apertures, 8. second inner seal ring, 9. second exterior seal ring, 10. valve spring, 11. thrust discs; 12. energy-storaging spring, 13. parking braking suction ports, 14. return springs, 15. push rods, 16. common pressure chamber, 17. ventilating holes; 18. the service brake chamber, 19. service brake suction ports, 20. parking braking chambeies, 21. energy-storaging spring chambeies, 22. diaphragms, 23. piston rods.
Embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically technological scheme of the present invention.
Referring to Fig. 1; The return air valve of a kind of inner return-air independence of present embodiment emission type spring braking air chamber is established one and is had the tubular valve seat 1 of shoulder hole through hole, and the major diameter of shoulder hole and minor diameter junction point are provided with valve port 102; As shown in Figure 2; Be to establish 6 axial pores 104 vertically on the radially table top of shoulder hole position between valve port 102 and valve seat 1 barrel, the barrel end of valve seat 1 is provided with radially pore 105 vertical with axial pore 104 and that communicate, is provided with second inner seal ring 8 in the minor diameter endoporus of valve seat 1 through hole; The valve seat external diameter is provided with connecting thread 103; Radially be provided with second exterior seal ring 9 between pore 105 and the connecting thread 103 on the external diameter,, locate the position of valve seat 1 in piston rod 23 with this at the diameter of the diameter that is provided with pore 105 positions radially greater than connecting thread 103.
In the diameter through hole at shoulder hole place, establish a location annular groove 101 in the valve seat 1, positioning ring groove 101 internal fixation one valve pocket 2, an end of valve pocket 2 is provided with middle through hole 201; As shown in Figure 3; Be provided with seal 3 in first in the endoporus of valve pocket 2, the position that is provided with seal 3 in first cooperates with the cylindrical body external diameter of valve 6, and the external diameter of valve pocket is provided with outer channel 202; The first outer seal 5 is housed in the outer channel 202; The position that outer seal 5 is housed cooperates with the endoporus of valve seat one end, in valve pocket is packed valve seat into, locatees with back-up ring 4 with the hole.
Referring to Fig. 4, an end of valve 6 and valve port 102 and applying, valve 6 is provided with diaphragm seal 602 with valve port 102 applying positions, and the central shaft of diaphragm seal 602 is to being air inlet center hole 603.Be provided with spring base hole 601 in the valve 6, dress valve spring 10 in the spring base hole 601.
Referring to Fig. 8, the housing of common pressure chamber 16 is provided with ventilating hole 17, and middle cylinder body 9 is provided with parking braking suction port 13 and service brake suction port 19, and parking braking suction port 13 communicates with parking braking chamber 20.As shown in Figure 6, when vehicle carried out service brake, the diaphragm 22 of being close to the secondary face 702 of spool 7 travelled forward, and accomplished service brake.The secondary face of spool 7 702, confined planes 703 are under the effect of driving brake chamber 18 air pressure; Make spool 7 still keep original state, cylinder body 9 positions in being limited in, the diaphragm seal 602 that the main end face 704 of spool 7 breaks away from the valve 6; Valve 6 close port 102; Under the acting in conjunction of a plurality of seal rings, the pressurized air in service brake chamber 18 can not get into energy-storaging spring chamber 21, has guaranteed the sealing of service brake well.
When vehicle carried out parking braking, as shown in Figure 7, valve seat 1 was along with piston rod 23 assemblies move together; Because the secondary face 702 of spool 7 is close to diaphragm 22; Cylinder body 9 in being limited in equally, when valve seat 1 end face moves to when contacting with the confined planes 703 of spool 7, the main end face 704 of spool 7 has backed down valve 6; Secondary face 702 promotion diaphragms 22, thrust disc 11 and track bar 15 by spool 7 together travels forward simultaneously, until accomplishing the vehicle Parking.In this course; Energy-storaging spring chamber 21 increases the air of volume; Enter into the central through bore of valve 6 by middle cylinder body 9 through radially-arranged radially pore 105 on the valve seat 1, promptly air-flow gets into piston rod 23 bore passages and obtains replenish air, keeps the atmospheric pressure state in energy-storaging spring chamber 21.
When vehicle was removed parking braking, along with the compression of energy-storaging spring 12, piston rod 23 assemblies moved to energy-storaging spring chamber 21 directions; Under the effect of return spring 14 power in common pressure chamber 16, thrust disc 11, diaphragm 22, spool 7 are with piston rod 23 servo-actuateds, and the opening state of maintenance valve; When spool 7 moves to when contacting with middle cylinder body 9, cylinder body 9 locating faces and stop motion during the confined planes 703 of spool 7 is limited in, piston rod 23 is still being done the accumulation of energy campaign; This moment, the main end face 704 of spool 7 broke away from valve 6; Valve 6 contacts with valve seat 1 under the effect of valve spring 10 power, closes suction port, and parking braking is removed.In this course; The volume in energy-storaging spring chamber 21 reduces gradually; Reduce the radially pore 105 of air on valve 6 central through bores, spool 7 central through bores, valve seat 1 of volume, discharge through other element, kept the atmospheric pressure state in spring energy-storage chamber 21 by middle cylinder body 9.
In the process of parking braking and braking releasing; Just because of the motion of piston-rod assembly, realize the open and close of valve, make the air in accumulation of energy chamber obtain exchange through the valve central through bore; The open and close of valve is that air obtains exchange, has guaranteed sealing requirements again.
The foregoing description is to explanation of the present invention, is not to qualification of the present invention, any structure after the simple transformation of the present invention, technology is all belonged to protection scope of the present invention.
Claims (7)
1. the return air valve of an inner return-air independence emission type spring braking air chamber; Comprise valve seat (1), spool (7); It is characterized in that described valve seat (1) axially is through hole, be provided with shoulder hole in the through hole, the shoulder hole place is provided with valve port (102); Be axially arranged with axial pore (104) between valve port (102) and valve seat (1) barrel; The barrel end of valve seat (1) is provided with and the axial vertical radially pore (105) of pore (104), in the diameter through hole at shoulder hole place, valve pocket (2) and valve (6) is housed in the valve seat (1), and an end of valve (6) and valve port (102) are fitted; The other end of valve (6) cooperates with the endoporus that valve pocket (2) is axially arranged with; Be provided with valve spring (10) in the valve (6), spool (7) is arranged in the valve seat (1) towards an end of the minor diameter through hole at shoulder hole place, and spool (7) is provided with pod apertures (705) towards an end of valve (6).
2. the return air valve of inner return-air independence emission type spring braking air chamber according to claim 1; An end that it is characterized in that described spool (7) is flange body (701); The other end is a cylindrical body, and cylindrical external diameter cooperates with minor diameter through hole one end at valve seat (1) shoulder hole place, and cylindrical end face is main end face (704); Flange body (701) is confined planes (703) with the end face of cylindrical body connecting part; Confined planes (703) to the length of main end face (704) is greater than the length of valve port (102) to valve seat (1) end face, and when confined planes (703) and valve seat (1) when being adjacent to, axially pore (104) communicates with pod apertures (705).
3. the return air valve of inner return-air independence emission type spring braking air chamber according to claim 1 and 2; It is characterized in that described valve seat (1) with endoporus that spool (7) cylindrical body cooperates in be provided with second inner seal ring (8); The external diameter of valve seat (1) is provided with connecting thread (103), and connecting thread (a 103) court radially end position of pore (105) direction is provided with second exterior seal ring (9).
4. the return air valve of inner return-air independence emission type spring braking air chamber according to claim 1 and 2; It is characterized in that described axial pore (104) is provided with several; Axially pore (104) leads to the diameter through hole position, shoulder hole place in the valve seat (1); Radially pore (105) is provided with several along valve seat (1) external diameter circumference, and radially pore (105) communicates with axial pore (104), and radially the external port of pore (105) communicates with the service brake chamber (18) of brake chamber.
5. the return air valve of inner return-air independence emission type spring braking air chamber according to claim 1; An end that it is characterized in that described valve spring (10) is positioned on the end face that the endoporus of valve pocket (2) is axially arranged with, and the other end of valve spring (10) is positioned in the spring base hole (601) in valve (6) endoporus.
6. the return air valve of inner return-air independence emission type spring braking air chamber according to claim 1; It is characterized in that the end that described valve (6) and valve port (102) are fitted is provided with diaphragm seal (602), valve (6) is gone up at the central shaft that is provided with diaphragm seal (602) one ends to being air inlet center hole (603).
7. according to the return air valve of claim 1 or 5 described inner return-air independence emission type spring braking air chambers; An end that it is characterized in that described valve pocket (2) axial centre is provided with middle through hole (201); Be provided with seal (3) in first in valve pocket (2) and the endoporus that valve (6) cooperates; The external diameter of valve pocket (2) is provided with outer channel (202); Be provided with the first outer seal (5) in the outer channel (202), the external diameter of valve pocket (2) cooperates with the endoporus of valve seat (1), and the axial of valve pocket (2) is fixed in the endoporus of valve seat (1) with back-up ring (4) through the hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105448092A CN102466046A (en) | 2010-11-16 | 2010-11-16 | Air return valve for inner air return independent discharge spring braking air chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105448092A CN102466046A (en) | 2010-11-16 | 2010-11-16 | Air return valve for inner air return independent discharge spring braking air chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102466046A true CN102466046A (en) | 2012-05-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105448092A Pending CN102466046A (en) | 2010-11-16 | 2010-11-16 | Air return valve for inner air return independent discharge spring braking air chamber |
Country Status (1)
| Country | Link |
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| CN (1) | CN102466046A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107002714A (en) * | 2014-12-16 | 2017-08-01 | 株式会社岛津制作所 | Control valve |
| CN107631074A (en) * | 2017-11-10 | 2018-01-26 | 廊坊新奥燃气设备有限公司 | A kind of motor valve |
| CN111845685A (en) * | 2020-07-17 | 2020-10-30 | 中车青岛四方车辆研究所有限公司 | Brake control unit with one-way breathing function |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3897091A (en) * | 1972-06-08 | 1975-07-29 | Dover Corp | Dry-break coupler |
| CN2079245U (en) * | 1989-10-09 | 1991-06-19 | 刘新刚 | Piston type valve tap |
| CN2846243Y (en) * | 2005-12-12 | 2006-12-13 | 瑞立集团有限公司 | Inner respiratory type spring brake air chamber |
| CN201215205Y (en) * | 2008-05-21 | 2009-04-01 | 浙江新三荣制冷有限公司 | By-pass valve |
-
2010
- 2010-11-16 CN CN2010105448092A patent/CN102466046A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3897091A (en) * | 1972-06-08 | 1975-07-29 | Dover Corp | Dry-break coupler |
| CN2079245U (en) * | 1989-10-09 | 1991-06-19 | 刘新刚 | Piston type valve tap |
| CN2846243Y (en) * | 2005-12-12 | 2006-12-13 | 瑞立集团有限公司 | Inner respiratory type spring brake air chamber |
| CN201215205Y (en) * | 2008-05-21 | 2009-04-01 | 浙江新三荣制冷有限公司 | By-pass valve |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107002714A (en) * | 2014-12-16 | 2017-08-01 | 株式会社岛津制作所 | Control valve |
| CN107002714B (en) * | 2014-12-16 | 2018-09-25 | 株式会社岛津制作所 | Control valve |
| CN107631074A (en) * | 2017-11-10 | 2018-01-26 | 廊坊新奥燃气设备有限公司 | A kind of motor valve |
| CN107631074B (en) * | 2017-11-10 | 2023-12-19 | 廊坊新奥智能科技有限公司 | Motor valve |
| CN111845685A (en) * | 2020-07-17 | 2020-10-30 | 中车青岛四方车辆研究所有限公司 | Brake control unit with one-way breathing function |
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