CN1919668A - ABS emergency relay valve - Google Patents

ABS emergency relay valve Download PDF

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Publication number
CN1919668A
CN1919668A CN 200510044419 CN200510044419A CN1919668A CN 1919668 A CN1919668 A CN 1919668A CN 200510044419 CN200510044419 CN 200510044419 CN 200510044419 A CN200510044419 A CN 200510044419A CN 1919668 A CN1919668 A CN 1919668A
Authority
CN
China
Prior art keywords
valve
emergency
relay
chamber
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN 200510044419
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Chinese (zh)
Inventor
王金山
王峰
刘波
张勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZIBO LONGDA VEHICLE FITTINGS MANUFACTURING Co Ltd
Original Assignee
ZIBO LONGDA VEHICLE FITTINGS MANUFACTURING Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZIBO LONGDA VEHICLE FITTINGS MANUFACTURING Co Ltd filed Critical ZIBO LONGDA VEHICLE FITTINGS MANUFACTURING Co Ltd
Priority to CN 200510044419 priority Critical patent/CN1919668A/en
Publication of CN1919668A publication Critical patent/CN1919668A/en
Pending legal-status Critical Current

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Abstract

The invention discloses an ABS urgent relay valve, which consists of electromagnetic adjusting valve and relay valve, wherein the relay valve is fixed on the bottom of electromagnetic adjusting valve with inlet of master cylinder connecting inlet pipe through electromagnetic valve, which controls cavity C, the vent top of relay valve connects depression channel through electromagnetic adjusting valve, the relay valve adopts urgent relay valve with vent pipe in the center of urgent relay valve, when the gas supplying pipe is broken suddenly, the vehicle breaks gas to brake urgently, which improves safety of entire vehicle.

Description

The ABS emergency relay valve
Affiliated technical field
The invention provides a kind of ABS emergency relay valve, belong to the automobile brake technical field.
Background technology
Along with China's express highway backbone network basically forms, large-tonnage, long wheelbase superimposed trailer, trailer with obvious ton-kilomiter cost advantage also increase year by year.When the long wheelbase emergency brake of vehicle, wheel is in locking, slip state, causes stopping distance to prolong, and vehicle produces sideslip or sideslip also makes vehicle lose steering capability, especially bad weather, road conditions not good, traffic accident appears when running at high speed easily.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can overcome above-mentioned defective, can be installed on superimposed trailer or the trailer ABS emergency relay valve of using, have emergency braking function, excellent working performance.Its technology contents is:
Comprise solenoid regulated valve and relay valve, wherein relay valve is fixed on the bottom of solenoid regulated valve, its total pump steam inlet is connected the inlet channel of solenoid regulated valve, and the air flue in solenoid regulated valve is connected control chamber C, the decompression air flue of solenoid regulated valve is connected at the top of the exhaust duct of relay valve, it is characterized in that: relay valve adopts emergency relay valve, and exhaust duct is arranged on the center of emergency relay valve.
Described ABS emergency relay valve, emergency relay valve comprises valve body and from up to down is installed in relay piston, the emergency piston assembly in the valve body successively and is installed in rapid release valve between the air extractor duct, wherein the upper surface of relay piston and valve body constitute control chamber C, and its lower surface and valve body and emergency piston assembly constitute outlet chamber D.
Described ABS emergency relay valve, the emergency piston assembly comprises emergency piston, Y type leather cup, exhaust seat, valve seat, valve and valve spring, wherein the emergency piston sidewall on, lower end and valve seal, Y type leather cup is sleeved on the middle part of emergency piston, and and valve seal, the cavity of emergency piston and valve body formation is partitioned into A chamber and B chamber, wherein the A chamber is communicated with admission port, the B chamber is communicated with the gas off-take that picks out gas port, be pressed with valve in the emergency piston from top to bottom successively, valve seat, at valve, be pressed with valve spring between the valve seat, exhaust duct is positioned at the centre of relay piston, and insert in the emergency piston its bottom, be positioned at the valve top.
Described ABS emergency relay valve, rapid release valve comprise diaphragm and diaphragm seat, and gas off-take is arranged on valve body and is positioned at the diaphragm place, is communicated with the upper surface of outlet chamber D and diaphragm respectively, and the bottom of diaphragm seat is provided with dust boot.
Described ABS emergency relay valve, solenoid regulated valve comprises by loam cake, lower cover, the valve body that housing constitutes and be installed in pressurize electromagnetic valve in the valve body side by side, the pressurize spool, vacuum solenoid valve, relief pressure valve cartridge and valve rod, pressurize spool wherein, relief pressure valve cartridge is sleeved in the valve rod respectively separately, its pressurize spool, be pressed with valve core spring between relief pressure valve cartridge lower end and the valve rod, the contiguous pressurize spool of lower cover place is provided with air flue and is communicated with the inlet channel of control mouth and pressurize spool one side respectively, following the covering that is positioned at relief pressure valve cartridge bottom is provided with air flue and is communicated with exhaust duct, the below that valve body is positioned at the pressurize spool is provided with the pore that is communicated with control chamber C and control mouth, and rubber sphere is fitted between pore and the lower cover.
Its principle of work is: the atmospheric pressure of main car enters source of the gas chamber A and source of the gas chamber B from admission port, enters the trailer air receiver by the source of the gas air extractor duct.When car brakeing: the control atmospheric pressure of master cylinder is connected control chamber C through control mouth, solenoid regulated valve successively, and the promotion relay piston moves down opens valve, and source of the gas chamber A atmospheric pressure enters in the outlet chamber D, exports from air extractor duct through rapid release valve again.When wheel is about to locking, wheel speed sensors is transferred to ECU (electronic control unit) to electric signal, control solenoid regulated valve after ECU handles cuts off the gas circuit of master cylinder by solenoid regulated valve control of access chamber C, and the atmospheric pressure of control chamber C is by the exhaust duct exhaust to atmosphere of valve body.Move on the relay piston and the valve disengaging, outlet chamber D is communicated with atmosphere through the valve exhaust duct, open with being about to rapid release valve, the atmospheric pressure beyond the air extractor duct communicates with atmosphere by rapid release valve, makes the braking force decline of wheel avoid wheel lockup.After the braking force of wheel descends, wheel speed sensors detects wheel continuation rolling and again electric signal is transferred to ECU, the outage of control solenoid regulated valve quits work after ECU handles, the control atmospheric pressure that makes master cylinder is again through solenoid regulated valve control of access chamber C, along with the increase of control chamber C air pressure reopens valve, the atmospheric pressure of outlet chamber D is raise wheel is increased braking force.By the continuous switching electricity work of wheel speed sensors and ECU control solenoid regulated valve, produced the boosting of control chamber C atmospheric pressure, pressurize, three kinds of states of step-down, make that relay piston 12 is upper and lower rapidly to be moved.Outlet chamber D and rapid release valve all were at a high speed and charged and discharged gaseity this moment, had guaranteed the stability of glancing impact automobile to greatest extent, had increased safety, had shortened stopping distance.
During brake off: the control atmospheric pressure of master cylinder is from the exhausr port exhaust to atmosphere of master cylinder, decline along with the control atmospheric pressure, control chamber C atmospheric pressure is together from the exhausr port exhaust to atmosphere of master cylinder, move on the relay piston with valve and break away from, outlet chamber D is communicated with atmosphere through the exhaust duct of valve, outlet chamber D atmospheric pressure descends and opens rapid release valve, and the rapid release valve that passes through beyond the air extractor duct of relay valve is discharged.
The present invention compared with prior art under the prerequisite of ECU that does not change the ABS anti-skid brake system (electronic control unit) and wheel speed sensors, is integrated emergency relay valve and ABS solenoid regulated valve, and can be installed on superimposed trailer, the trailer and use.When the supply air line of main car ruptured suddenly, trailer had the emergency braking function of dying, and had improved the safety of car load.
Description of drawings
Fig. 1 is the birds-eye view of the embodiment of the invention;
Fig. 2 is an A-A cutaway view embodiment illustrated in fig. 1;
Fig. 3 is a B-B cutaway view embodiment illustrated in fig. 1.
The specific embodiment
1, emergency piston 2, valve spring 3, Y type leather cup 4, exhaust duct 5, exhaust seat 6, valve seat 7, valve 8, spring perch 9, gas off-take 10, admission port 11, source of the gas air extractor duct 12, relay piston 13, seal ring 14, valve body 15, control mouth 16, rubber sphere 17, inlet channel 18, lower cover 19, valve core spring 20, pressurize spool 21, housing 22, sealing surface 23, pressurize electromagnetic valve 24, loam cake 25, binding post 26, air flue 27, bolt 28, valve rod 29, relief pressure valve cartridge 30, vacuum solenoid valve 31, sealing surface 32, air flue 33, exhaust duct 34, diaphragm 35, diaphragm seat 36, air extractor duct 37, dust boot 38, inlet channel 39, decompression air flue 40, pore
In the embodiment shown in Fig. 1~3: relay valve adopts emergency relay valve to be fixed on the bottom of solenoid regulated valve, comprise that valve body 14 reaches the relay piston 12 that from up to down is installed in successively in the valve body 14, emergency piston assembly and be installed in rapid release valve between the air extractor duct 36, wherein rapid release valve comprises diaphragm 34 and diaphragm seat 35, valve body 14 is positioned at diaphragm 34 places and is provided with gas off-take 9, the upper surface that is communicated with outlet chamber D and diaphragm 34 respectively, the bottom of diaphragm seat 35 is provided with dust boot 37, the emergency piston assembly comprises emergency piston 1, Y type leather cup 3, valve seat 6, valve 7 and valve spring 2, wherein emergency piston 1 sidewall on, lower end and valve body 14 sealings, Y type leather cup 3 is sleeved on the middle part of emergency piston 1, and with valve body 14 sealing, emergency piston 1 and the cavity that valve body 14 constitutes are partitioned into A chamber and B chamber, wherein the A chamber is communicated with admission port 10, the B chamber is communicated with the gas off-take 9 that picks out gas port 36, be pressed with valve 7 in the emergency piston 1 from top to bottom successively, valve seat 6, at valve 7, be pressed with valve spring 2 between the valve seat 6, exhaust duct 33 is positioned at the centre of relay piston 12, and insert in the emergency piston 1 its bottom, be positioned at valve 7 tops.Master cylinder control mouth 15 is connected the inlet channel 17 of solenoid regulated valves, and connects control chamber C through air flue 26, the air flue 32 of solenoid regulated valve, and the exhaust duct of solenoid regulated valve is connected at the top of upper shell exhaust duct 33.Solenoid regulated valve comprises by loam cake 24, lower cover 18, the valve body that housing constitutes and be installed in pressurize electromagnetic valve 23 in the valve body, pressurize spool 20, vacuum solenoid valve 30, relief pressure valve cartridge 29 and valve rod 28, wherein the pressurize spool 20, relief pressure valve cartridge 29 lays respectively at the below of valve rod 28, its lower end is pressed with valve core spring 19, lower cover 18 contiguous pressurize spools 20 places are provided with air flue 17 and are communicated with the inlet channel 38 of control mouth 15 and pressurize spool 20 1 sides respectively, the lower cover 18 that is positioned at relief pressure valve cartridge 29 bottoms is provided with air flue 39 and is communicated with exhaust duct 33, the below that valve body 14 is positioned at pressurize spool 20 is provided with the pore 40 that is communicated with control chamber C and control mouth 15, and rubber sphere 16 is fitted between pore 40 and the lower cover 18.
During work, the atmospheric pressure of main car enters source of the gas chamber A and source of the gas chamber B from admission port 10, enters the trailer air receiver by source of the gas air extractor duct 11.When car brakeing: the control atmospheric pressure of master cylinder is connected control chamber C through inlet channel 17, air flue 26, the air flue 32 of control mouth 15, solenoid regulated valve successively, promotion relay piston 12 moves down opens valve 7, atmospheric pressure among the A of source of the gas chamber enters in the outlet chamber D, enter the top of diaphragm 34 again through gas off-take 9, with diaphragm 34 and 35 sealings of diaphragm seat, the atmospheric pressure of outlet chamber D is from air extractor duct 36 outputs.When emergency brake of vehicle: be installed in wheel speed sensors on the wheel and detect wheel and be about to locking, electric signal is transferred to ECU (electronic control unit), the pressurize electromagnetic valve 23 and the vacuum solenoid valve 30 energising work of control solenoid regulated valve after ECU handles, ECU makes pressurize spool 20 overcome sealing surface 22 sealings that move on the spring force of valve core spring 19 with valve rod 28 for 23 energisings of pressurize electromagnetic valve, cut off the gas circuit of the control atmospheric pressure control of access chamber C of master cylinder, ECU gives vacuum solenoid valve 30 energisings again, relief pressure valve cartridge 29 is overcome move on the spring force of valve core spring 19 and sealing surface 31 breaks away from, make exhaust duct 33 exhaust to atmospheres of the atmospheric pressure of control chamber C by decompression air flue 39 and valve body 14.The atmospheric pressure of control chamber C descends, move on the relay piston 12 its lower surface and valve 7 are broken away from, outlet chamber D communicates with atmosphere through valve exhaust duct 4, the atmospheric pressure of outlet chamber D descends to making to move on the rapid release valve diaphragm 34 with diaphragm seat 35 and breaks away from, the atmospheric pressure of air extractor duct 36 communicates with atmosphere by rapid release valve, makes the braking force decline of wheel avoid wheel lockup.After the braking force of wheel descends, wheel speed sensors detects wheel continuation rolling and again electric signal is transferred to ECU, handling the pressurize electromagnetic valve 23 of controlling solenoid regulated valve in the back and vacuum solenoid valve 30 through ECU cuts off the power supply in succession and quits work, under the spring force effect of valve core spring 19, pressurize electromagnetic valve 23 and vacuum solenoid valve 30 come back to the initial position separately, make the control atmospheric pressure of master cylinder reenter control chamber C from control mouth 15, along with the increase of air pressure reopens valve 7, the atmospheric pressure of outlet chamber D is raise wheel is increased braking force.Work by the pressurize electromagnetic valve 23 of wheel speed sensors and ECU control solenoid regulated valve and the continuous switching electricity of vacuum solenoid valve 30, the boosting of control chamber C atmospheric pressure, pressurize, three kinds of states of step-down have been produced, make relay piston 12 upper and lower rapidly mobile, this moment, outlet chamber D and rapid release valve were in all that high speed is filled, deflated state, guaranteed the stability of glancing impact automobile to greatest extent, increase safety, prevented wheel lockup, shortened stopping distance.During brake off: the control atmospheric pressure of master cylinder is from the exhausr port exhaust to atmosphere of master cylinder.Along with the decline of atmospheric pressure, rubber sphere between solenoid regulated valve lower cover 18 and valve body 14 16 breaks away from valve body 14, makes control chamber C atmospheric pressure by the gap between rubber sphere 16 and the valve body 14, together from the exhausr port exhaust to atmosphere of master cylinder.Move on the relay piston 12 and valve 7 breaks away from, outlet chamber D is communicated with atmosphere through the exhaust duct 4 of valve 7, outlet chamber D atmospheric pressure descends to making and moves on the rapid release valve diaphragm 34 and 35 disengagings of diaphragm seat, and the atmospheric pressure of air extractor duct 36 is by the rapid release valve discharge that communicates with atmosphere.
When the supply air line of main car ruptures suddenly, the atmospheric pressure that admission port 10 enters source of the gas chamber A also descends thereupon, Y type leather cup 3 remains unchanged the atmospheric pressure of source of the gas chamber B with valve body 14 sealings, under the effect of the atmospheric pressure of source of the gas chamber B and trailer air receiver, promote to move on the emergency piston 1 with valve 7 and the sealing of relay piston 12 sealing surfaces, open valve 7, the atmospheric pressure of source of the gas chamber B enters outlet chamber D, carries out emergency braking by air extractor duct 36 output pressure power.

Claims (5)

1, a kind of ABS emergency relay valve, comprise solenoid regulated valve and relay valve, wherein relay valve is fixed on the bottom of solenoid regulated valve, its total pump steam inlet is connected the inlet channel (17) of solenoid regulated valve, and the air flue in solenoid regulated valve (26) is connected control chamber C, the decompression air flue (39) of solenoid regulated valve is connected at the top of the exhaust duct of relay valve (4), it is characterized in that: relay valve adopts emergency relay valve, and exhaust duct (4) is arranged on the center of emergency relay valve.
2, ABS emergency relay valve as claimed in claim 1, it is characterized in that: emergency relay valve comprises valve body (14) and from up to down is installed in relay piston (12), the emergency piston assembly in the valve body (14) successively and is installed in rapid release valve between the air extractor duct (36), wherein the upper surface of relay piston (12) and valve body (14) constitute control chamber C, and its lower surface and valve body (14) and emergency piston assembly constitute outlet chamber D.
3, ABS emergency relay valve as claimed in claim 1 or 2, it is characterized in that: the emergency piston assembly comprises emergency piston (1), Y type leather cup (3), exhaust seat (5), valve seat (6), valve (7) and valve spring (2), wherein emergency piston (1) sidewall on, lower end and valve body (14) sealing, Y type leather cup (3) is sleeved on the middle part of emergency piston (1), and seal with valve body (14), emergency piston (1) and the cavity that valve body (14) constitutes are partitioned into A chamber and B chamber, wherein the A chamber is communicated with admission port (10), the B chamber is communicated with the gas off-take that picks out gas port (36) (9), be pressed with valve (7) in the emergency piston (1) from top to bottom successively, valve seat (6), in valve (7), be pressed with valve spring (2) between the valve seat (6), exhaust duct (33) is positioned at the centre of relay piston (12), and insert in the emergency piston 1 its bottom, be positioned at valve (7) top.
4, ABS emergency relay valve as claimed in claim 2, it is characterized in that: rapid release valve comprises diaphragm (34) and diaphragm seat (35), gas off-take (9) is arranged on valve body (14) and is positioned at diaphragm (34) and locates, the upper surface that is communicated with outlet chamber D and diaphragm (34) respectively, the bottom of diaphragm seat (35) is provided with dust boot (37).
5, ABS emergency relay valve as claimed in claim 1, it is characterized in that: solenoid regulated valve comprises by loam cake (24), lower cover (18), the valve body that housing (21) constitutes and be installed in pressurize electromagnetic valve (23) in the valve body side by side, pressurize spool (20), vacuum solenoid valve (30), relief pressure valve cartridge (29) and valve rod (28), pressurize spool (20) wherein, relief pressure valve cartridge (29) is sleeved on respectively in the valve rod (28) separately, its pressurize spool (20), be pressed with valve core spring (19) between relief pressure valve cartridge (29) lower end and the valve rod (28), the contiguous pressurize spool of lower cover (18) (20) is located to be provided with air flue (17) and is communicated with the inlet channel (38) of control mouthful (15) and pressurize spool (20) one sides respectively, the lower cover (18) that is positioned at relief pressure valve cartridge (29) bottom is provided with air flue (39) and is communicated with exhaust duct (33), the below that valve body (14) is positioned at pressurize spool (20) is provided with the pore (40) that is communicated with control chamber C and control mouthful (15), and rubber sphere (16) is fitted between pore (40) and the lower cover (18).
CN 200510044419 2005-08-22 2005-08-22 ABS emergency relay valve Pending CN1919668A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200510044419 CN1919668A (en) 2005-08-22 2005-08-22 ABS emergency relay valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200510044419 CN1919668A (en) 2005-08-22 2005-08-22 ABS emergency relay valve

Publications (1)

Publication Number Publication Date
CN1919668A true CN1919668A (en) 2007-02-28

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ID=37777558

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Application Number Title Priority Date Filing Date
CN 200510044419 Pending CN1919668A (en) 2005-08-22 2005-08-22 ABS emergency relay valve

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Country Link
CN (1) CN1919668A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101372223B (en) * 2007-08-20 2011-08-31 山东理工大学 Electric-controlled load sensing proportion valve
CN102205840A (en) * 2010-05-25 2011-10-05 吴金富 Relay valve
CN107521481A (en) * 2017-07-06 2017-12-29 浙江万安科技股份有限公司 A kind of integrated form quick release valve provided with electromagnetic valve assembly
CN107600059A (en) * 2017-10-11 2018-01-19 浙江万安科技股份有限公司 Integrated form relay valve band ABS electromagnetism valve assemblies
CN108082168A (en) * 2017-12-11 2018-05-29 广州瑞立科密汽车电子股份有限公司 Automatically controlled relay valve with bilateral one-way function
CN108162945A (en) * 2018-01-05 2018-06-15 瑞立集团瑞安汽车零部件有限公司 A kind of electronic parking valve and its control method
WO2019170704A1 (en) * 2018-03-08 2019-09-12 Continental Teves Ag & Co. Ohg Electromagnetic valve
CN113370952A (en) * 2021-06-21 2021-09-10 沈阳义嘉仁卡客汽车技术有限公司 Automobile cylinder cone type relay pump valve device and braking method and application thereof
CN113386726A (en) * 2021-07-19 2021-09-14 中国重汽集团成都王牌商用车有限公司 Air chamber upper cover system with anti-lock function and control method
CN113500990A (en) * 2021-08-26 2021-10-15 山东康健汽车配件科技股份有限公司 Electric control auxiliary braking system of relay valve
CN113859201A (en) * 2021-09-16 2021-12-31 东科克诺尔商用车制动技术有限公司 Integrated commercial vehicle brake module with longitudinally arranged electromagnetic valve

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101372223B (en) * 2007-08-20 2011-08-31 山东理工大学 Electric-controlled load sensing proportion valve
CN102205840A (en) * 2010-05-25 2011-10-05 吴金富 Relay valve
CN107521481B (en) * 2017-07-06 2023-08-18 浙江万安科技股份有限公司 Integrated quick release valve belt electromagnetic valve assembly
CN107521481A (en) * 2017-07-06 2017-12-29 浙江万安科技股份有限公司 A kind of integrated form quick release valve provided with electromagnetic valve assembly
CN107600059A (en) * 2017-10-11 2018-01-19 浙江万安科技股份有限公司 Integrated form relay valve band ABS electromagnetism valve assemblies
CN107600059B (en) * 2017-10-11 2024-01-12 浙江万安科技股份有限公司 Integrated relay valve with ABS electromagnetic valve assembly
CN108082168A (en) * 2017-12-11 2018-05-29 广州瑞立科密汽车电子股份有限公司 Automatically controlled relay valve with bilateral one-way function
CN108162945A (en) * 2018-01-05 2018-06-15 瑞立集团瑞安汽车零部件有限公司 A kind of electronic parking valve and its control method
WO2019170704A1 (en) * 2018-03-08 2019-09-12 Continental Teves Ag & Co. Ohg Electromagnetic valve
CN113370952A (en) * 2021-06-21 2021-09-10 沈阳义嘉仁卡客汽车技术有限公司 Automobile cylinder cone type relay pump valve device and braking method and application thereof
CN113370952B (en) * 2021-06-21 2024-05-03 沈阳义嘉仁卡客汽车技术有限公司 Automobile cylindrical cone type relay pump valve device and braking method and application thereof
CN113386726A (en) * 2021-07-19 2021-09-14 中国重汽集团成都王牌商用车有限公司 Air chamber upper cover system with anti-lock function and control method
CN113386726B (en) * 2021-07-19 2022-11-22 中国重汽集团成都王牌商用车有限公司 Air chamber upper cover system with anti-lock function and control method
CN113500990B (en) * 2021-08-26 2022-04-08 山东康健汽车配件科技股份有限公司 Electric control auxiliary braking system of relay valve
CN113500990A (en) * 2021-08-26 2021-10-15 山东康健汽车配件科技股份有限公司 Electric control auxiliary braking system of relay valve
CN113859201B (en) * 2021-09-16 2022-06-07 东科克诺尔商用车制动技术有限公司 Integrated commercial vehicle brake module with longitudinally arranged electromagnetic valve
CN113859201A (en) * 2021-09-16 2021-12-31 东科克诺尔商用车制动技术有限公司 Integrated commercial vehicle brake module with longitudinally arranged electromagnetic valve

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