CN109305156B - EPB valve assembly with internal respiration structure and electronic parking brake system - Google Patents
EPB valve assembly with internal respiration structure and electronic parking brake system Download PDFInfo
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- CN109305156B CN109305156B CN201811158770.3A CN201811158770A CN109305156B CN 109305156 B CN109305156 B CN 109305156B CN 201811158770 A CN201811158770 A CN 201811158770A CN 109305156 B CN109305156 B CN 109305156B
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- 230000029058 respiratory gaseous exchange Effects 0.000 title claims abstract description 26
- 238000004891 communication Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 238000009423 ventilation Methods 0.000 claims description 3
- 239000013049 sediment Substances 0.000 abstract description 3
- 230000010354 integration Effects 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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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
- B60T15/025—Electrically controlled valves
- B60T15/027—Electrically controlled valves in pneumatic systems
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- Multiple-Way Valves (AREA)
Abstract
The invention relates to the field of electronic parking brake systems, and discloses an EPB valve assembly with an internal breathing structure and the EPB electronic parking brake system, wherein the EPB valve assembly comprises a valve body, an air inlet (11) and an air outlet are formed in the valve body, a first valve cavity (310) for installing a pneumatic control two-position three-way valve (31) and a channel N for exhausting are formed in the valve body, a first valve core (311) is arranged in the first valve cavity (310), a channel K is formed in the right end face of the first valve cavity (310), the channel K is communicated with the channel N, and compressed air between the first valve core (311) and the channel K enters the channel N through the channel K and is discharged when the first valve core (311) moves towards the channel K. The valve body is high in integration degree, convenient in pipeline arrangement and capable of preventing sediment from being blocked by internal respiration.
Description
Technical Field
The invention relates to the field of automobile electronic parking brake systems, in particular to an EPB valve assembly with an internal breathing structure and an electronic parking brake system.
Background
EPB: ELECTRICAL PARK Breake an electronic parking brake system is an EPB valve assembly which changes a conventional manual valve and a quick release valve into an electronic control unit (NCU) and has an internal breathing structure, and combines other systems and logic. The automobile safety control system has the advantages of compact structure, complete functions and the like. The traditional conventional parking brake is composed of a manual control valve, a cab connecting pipeline and a quick release valve for parking, and has the following defects: 1) Because the manual control valve and the cab connecting pipeline are required to be arranged in the cab of the traditional parking system, the space utilization rate is low; 2) The parking function can be realized only by single function; 3) The pipeline arrangement and the installation are complicated, and the maintenance is also troublesome.
In addition, in the use process of the automobile, sediment and dust on the road surface are easy to adhere to the valve body, if the external breathing type exhaust device is adopted, the situation of blocking the external breathing valve is generated after the time is long, so that the normal operation of the EPB valve assembly with the internal breathing structure is influenced, and the braking performance of the whole automobile is influenced under severe conditions.
Disclosure of Invention
In order to overcome the defects of the technology, the invention provides an EPB valve assembly with an internal breathing structure and an EPB electronic parking brake system, wherein the EPB valve assembly with the internal breathing structure has the functions of conventional parking, hill start assistance, emergency braking, automatic parking, forgetting prevention parking, low-pressure protection and the like; removing the manual control valve, connecting a cab pipeline and a quick release valve for parking; the driving safety is improved, and the operation comfort of a driver is improved.
In order to solve the technical problems, the invention is solved by the following technical scheme:
the EPB valve assembly with the internal respiration structure is characterized in that an air inlet and an air outlet are formed in a valve body, a first valve cavity for installing a pneumatic control two-position three-way valve and a channel N for exhausting are formed in the valve body, a first valve core is installed in the first valve cavity, a channel K is formed in the right end face of the first valve cavity and is communicated with the channel N, and compressed air between the first valve core and the channel K enters the channel N to be exhausted through the channel K when the first valve core moves to the channel K. The exhaust process is carried out in an internal respiration mode, so that the cleanliness of the whole valve body is guaranteed, and the service life of the valve body is guaranteed.
Preferably, the EPB valve body comprises an upper valve body and a lower valve body, a second valve cavity is formed in the lower valve body, a relay piston is installed in the second valve cavity, the upper end face of the relay piston and the inner wall of the second valve cavity enclose a C cavity, and compressed air in the first valve cavity is discharged from the channel K through the C cavity in the process that the first valve core moves away from the channel K. Thereby forming a complete internal breathing structure.
Preferably, the valve further comprises a two-position three-way electromagnetic valve, the first valve cavity comprises a first piston cavity and a valve core cavity, the left end of the first piston cavity is provided with an air taking joint, the valve core cavity is divided into an E cavity, an F cavity and an X cavity, the E cavity and the F cavity are controlled to be communicated and disconnected through the first valve core, the side wall of the E cavity is provided with a channel which is respectively communicated with the air inlet and the two-position three-way electromagnetic valve, the two-position three-way electromagnetic valve is communicated with the C cavity and the first piston cavity, and the two-position three-way electromagnetic valve controls the communication among the C cavity, the E cavity and the first piston cavity; the C cavity and the N channel are controlled to be connected and disconnected by arranging a pressure reducing electromagnetic valve; a pressure-standby electromagnetic valve is arranged between the cavity F and the cavity C, and the pressure-standby electromagnetic valve controls the connection and disconnection of the cavity F and the cavity C. The control is accurate between each valve body, and each valve body intercommunication all is connected through built-in passageway moreover to make each process more stable, it is more reliable. And the device is convenient for later examination and maintenance, and simultaneously facilitates the control of the communication between the electromagnetic valves and the cavities.
Preferably, a first spring is arranged on the right end face of the valve core cavity, a first piston is arranged in the first piston cavity, the first piston moves rightwards to drive the first valve core to move rightwards to compress the first spring, a D cavity is formed by surrounding the first piston, the gas taking connector and the side wall of the first piston cavity, the D cavity is communicated with the two-position three-way electromagnetic valve, the section of the first piston cavity is larger than the section of the valve core cavity, and a limiting step is formed at the joint. The limiting step limits the stroke of the first piston, so that the movement stroke of the first valve core is limited, and the E cavity and the F cavity are stably communicated.
Preferably, adjacent chambers of the first piston chamber, the E chamber, the F chamber and the X chamber are separated by arranging an elastic retainer ring and a ventilation sleeve, and in an initial state, the valve core is in sealing fit with the retainer ring, and the E chamber and the F chamber are separated; in the air inlet state, the first valve core moves rightwards, and the E cavity and the F cavity are communicated with a gap between the first valve core through the check ring.
Preferably, the first piston comprises a piston body and an insertion rod inserted in the first valve core, an auxiliary air outlet channel is formed in the insertion rod, a channel Y is arranged in the middle of the first valve core, an air leakage port is formed in one end, close to the piston body, of the inner side wall of the valve core cavity, the air leakage port is communicated with the space in the upper valve body, and the air leakage port, the valve core cavity, the auxiliary air outlet channel, the channel Y, the channel K and the channel N are sequentially communicated to form an air leakage channel. The valve body is prevented from being damaged by air leakage to the upper cover assembly, and leaked compressed air is discharged through the air leakage channel.
Preferably, the two-position three-way electromagnetic valve comprises an L cavity, an O cavity and a J cavity, the two-position three-way electromagnetic valve is in an electrified state, the L cavity is communicated with the O cavity, the two-position three-way electromagnetic valve is in a power-off state, and the O cavity is communicated with the J cavity; the J cavity is communicated with the D cavity, the O cavity is communicated with the C cavity, and the E cavity is communicated with the L cavity; the standby electromagnetic valve comprises a P cavity and a Q cavity, wherein the F cavity is communicated with the P cavity, the Q cavity is communicated with the C cavity, and the valve core of the standby electromagnetic valve controls the communication between the P cavity and the Q cavity; the pressure reducing electromagnetic valve comprises a G cavity, the G cavity is communicated with a C cavity, and a valve core of the pressure reducing electromagnetic valve 10 controls the G cavity to be communicated with a channel N.
Preferably, a connecting part is further arranged in the valve body, the connecting part separates a mounting cavity of the upper valve body from a second valve cavity of the lower valve body, an upper cover assembly is sealed at the upper end of the upper valve body, an EPB electronic control unit is arranged in the upper valve body, a two-position three-way electromagnetic valve, a pressure reducing electromagnetic valve and a standby electromagnetic valve are arranged in the upper valve body and are communicated with the C cavity through a channel formed in the connecting part, a valve assembly and an exhaust guide seat are arranged at the bottom of the second valve cavity, an exhaust port is formed in the exhaust guide seat, a valve rod is further arranged in the second valve cavity, a relay piston is arranged on the valve rod in a sealing mode, a channel N is arranged in the middle of the valve rod, and the exhaust port is communicated with the channel N; the valve assembly is arranged below the relay piston, the second valve cavity comprises a C cavity positioned above the relay piston and a B cavity positioned below the relay piston, the B cavity is communicated with the air outlet, the air inlet is communicated with an A cavity, and the A cavity and the B cavity are controlled to be communicated and disconnected through the valve assembly.
Preferably, the novel air inlet valve further comprises a return spring, one end of the return spring is in contact with the exhaust guide seat, the other end of the return spring is in contact with the valve assembly to disconnect the communication between the cavity A and the cavity B, a one-way valve is arranged in a channel of the air inlet communicated with the cavity A, and a filter element and a muffler assembly are arranged on the exhaust guide seat.
Preferably, a manual stop valve for forcedly releasing the parking brake is arranged in the air taking connector, and the manual stop valve is communicated with the D cavity; the control port is communicated to the C cavity through the air passage.
The invention also provides an EPB electronic parking brake system, which comprises the integrated EPB valve assembly, wherein the air outlet comprises a first air outlet, a second air outlet, a third air outlet and a fourth air outlet, the electronic parking brake system further comprises an air storage cylinder, a spring brake cylinder parking cavity and a trailer module, the air inlet is connected with the air storage cylinder, the first air outlet and the second air outlet are both connected with the spring brake cylinder parking cavity, the fourth air outlet is connected with the air inlet of the trailer module, the control port is connected with the air brake valve, and the third air outlet is connected with the control port of the trailer module.
The invention has the remarkable technical effects due to the adoption of the technical scheme: the invention removes a manual control valve, a cab connecting pipeline and a quick release valve for parking, and provides an EPB valve assembly with an internal breathing structure, wherein the EPB valve assembly with the internal breathing structure has the functions of conventional parking, hill start assistance, emergency braking, automatic parking, forgetting prevention, parking, low-pressure protection and the like; removing the manual control valve, connecting a cab pipeline and a quick release valve for parking; the driving safety is improved, and the operation comfort of a driver is improved. And the whole valve body has the advantages of long service life, convenient maintenance, small occupied space, high integration degree and the like.
The invention also provides a method for removing the breather valve on the valve body, and arranging an inner breathing type air exhaust passage in the valve body. The internal respiration type exhaust passage can effectively prevent particles such as sediment, dust and the like from entering the valve body, and avoid the situation that a breather valve arranged on the valve body is blocked and fails under severe working conditions; compared with the condition that the exhaust device (the breather valve) is arranged on the outer wall of the valve body, the cost can be effectively reduced, and the maintenance is convenient; and meanwhile, the exhaust passage is arranged at the sides of the piston and the valve rod, so that the situation that the piston generates back pressure when the piston moves can be solved. And can solve when the gas leakage appears in the valve body or other circumstances lead to in the casing atmospheric pressure rise influence last valve body and go up the valve body part security problem, the high-pressure gas in the last valve body can exhaust with the mode of interior exhaust.
Drawings
Fig. 1 is a schematic diagram of a front view structure of the present embodiment.
Fig. 2 is a schematic left-view structure of the present embodiment.
Fig. 3 is a schematic top view of the present embodiment.
Fig. 4 is a schematic view of the structure taken along line a-a in fig. 2.
Fig. 5 is a schematic view showing a sectional structure along b-b in fig. 2.
Fig. 6 is a schematic view of the structure taken along d-d in fig. 3.
Fig. 7 is a schematic view of the structure taken along c-c in fig. 2.
Fig. 8 is a partial enlarged view of fig. 4.
Fig. 9 is a pneumatic connection diagram of the EPB electronic parking brake system.
The names of the parts indicated by the numerical references in the drawings are as follows: the valve comprises an upper cover assembly, an EPB electronic control unit, an upper valve body, a control port, a 5 air taking connector, a 6 first piston, a 7 lower valve body, an 8 special-shaped sealing ring, a 9 check valve, a10 decompression electromagnetic valve, an 11 air inlet, a 12 valve rod, a 13 valve assembly, a 14 return spring, a15 exhaust guide seat, a 16 muffler assembly, a 17 spare electromagnetic valve, a 18 two-position three-way electromagnetic valve, a 19 relay piston, a 20 control port connector, a 21 first air outlet, a 22 second air outlet, a 24 reserved port, a 25 third air outlet, a 12/26 and a fourth air outlet. 27. The diaphragm, 28, seven-core plug, 29, exhaust port, 31-pneumatic control two-position three-way valve, 311-first valve core, 312-valve core cavity, 313-first piston cavity, 32-insert rod, 612-auxiliary air outlet channel, 613-air outlet port, 61-piston body, 314-first spring.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. Letters in the specification set forth in this specification are merely to identify features, and should not be construed as limiting the shape of the features.
Example 1
As shown in fig. 1 to 8, an EPB valve assembly with an internal breathing structure is provided with an air inlet 11 and an air outlet on a valve body, a first valve cavity 310 for installing a pneumatic control two-position three-way valve 31 and a channel N for exhausting arranged in the valve body are arranged on the valve body, a first valve core 311 is installed in the first valve cavity 310, a channel K is arranged on the right end surface of the first valve cavity 310, the channel K is communicated with the channel N, when the first valve core 311 moves towards the channel K, compressed air between the first valve core 311 and the channel K enters the channel N and is discharged through the channel K, the EPB valve body comprises an upper valve body 3 and a lower valve body 7, a second valve cavity 90 is arranged in the lower valve body 7, a relay piston 19 is installed in the second valve cavity 90, the upper end surface of the relay piston 19 and the inner wall of the second valve cavity 90 enclose a C cavity, the compressed air in the first valve cavity 310 is discharged from the channel K through the C cavity, the first valve cavity 18 comprises a first piston cavity 313 and a core cavity 312, when the first valve core 311 moves towards the channel K, the left end 313 is provided with a first valve cavity 313 and a valve cavity 18, the first valve cavity is separated from the C cavity, the first valve cavity is provided with a valve cavity C5, the left end 313 is provided with a valve cavity F and a valve cavity F18, the two-shaped valve cavity F is connected with the two valve cavities, and a valve cavity C cavity F is connected with the two valve cavity 18, and the valve cavity F is connected with the valve cavity C18, and the valve cavity C is connected with the valve cavity C18, and the valve cavity is connected with the valve cavity C18; the C cavity and the N channel are controlled to be connected and disconnected by arranging a pressure reducing electromagnetic valve 10; a standby electromagnetic valve 17 is arranged between the F cavity and the C cavity, and the standby electromagnetic valve 17 controls the connection and disconnection of the F cavity and the C cavity.
The right end face of the spool cavity 312 is provided with a first spring 314, which is disposed in the X cavity, with one end abutting against the right end of the spool cavity 312 and the other end abutting against the right end of the first spool 311. The first piston chamber 313 is internally provided with a first piston 6, the first piston 6 moves rightwards to drive the first valve core 311 to move rightwards to compress the first spring 314, a D chamber is enclosed between the first piston 6, the gas taking connector 5 and the side wall of the first piston chamber 313, the D chamber is communicated with the two-position three-way electromagnetic valve 18, the section of the first piston chamber 313 is larger than that of the valve core chamber 312, a limiting step is formed at the joint, adjacent chambers of the first piston chamber 313, the E chamber, the F chamber and the X chamber are separated by arranging an elastic retainer ring 315 and a ventilation sleeve 316, and in an initial state, the valve core is in sealing fit with the retainer ring 315, and the E chamber and the F chamber are separated; in the air intake state, the first valve core 311 moves to the right, and the E cavity and the F cavity are communicated with a gap between the first valve core 311 through the retainer ring 315.
The first piston 6 comprises a piston body 61 and an inserting rod 62 inserted in the first valve core 311, an auxiliary air outlet channel 621 is formed in the inserting rod 62, a channel Y is arranged in the middle of the first valve core 311, an air leakage port 613 is formed in one end, close to the piston body 61, of the inner side wall of the valve core cavity 312, the air leakage port 613 is communicated with the space in the upper valve body 3, and when leaked compressed air exists in the upper valve body 3, the compressed air in the upper valve body 3 is sequentially discharged from the exhaust port 29 through the air leakage port, and then passes through the valve core cavity 312, the auxiliary air outlet channel 612, the channel Y, the channel K and the channel N. Wherein the channel Y, the channel K, the spool chamber 312 and the first piston chamber 313 are coaxially arranged.
The two-position three-way electromagnetic valve 18 comprises an L cavity, an O cavity and a J cavity, when the two-position three-way electromagnetic valve 18 is in an electrified state, the L cavity is communicated with the O cavity, the two-position three-way electromagnetic valve 18 is in a power-off state, and the O cavity is communicated with the J cavity; the J cavity is communicated with the D cavity through a channel arranged on the connecting part 330, the O cavity is communicated with the C cavity through a channel arranged on the connecting part 330, and the E cavity is communicated with the L cavity through a channel arranged on the connecting part 330; the standby electromagnetic valve 17 comprises a P cavity and a Q cavity, wherein the F cavity is communicated with the P cavity, the Q cavity is communicated with the C cavity through a channel arranged on the connecting part 330, and the valve core of the standby electromagnetic valve 17 controls the communication between the P cavity and the Q cavity; the pressure reducing solenoid valve 10 comprises a G cavity, the G cavity is communicated with a C cavity through a channel formed in the connecting part 330, and a valve core of the pressure reducing solenoid valve 10 controls the G cavity to be communicated with a channel N. The valve body is also provided with a connecting part 330, in this embodiment, the connecting part 330 and the upper valve body 3 are integrally formed, and a special-shaped sealing ring 8 is arranged between the lower valve body 7 and the upper valve body 3. The connecting portion 330 separates the installation cavity of the upper valve body 3 from the second valve cavity 90 of the lower valve body 7, the upper end of the upper valve body 3 is sealed with the upper cover assembly 1, the EPB electronic control unit 2 is disposed in the upper valve body 3, and in this embodiment, the EPB electronic control unit 2 is integrated on the upper cover assembly 1. The two-position three-way electromagnetic valve 18, the pressure reducing electromagnetic valve 10 and the pressure preparing electromagnetic valve 17 are arranged in the upper valve body 3 and are communicated with the C cavity through a channel formed in the connecting part 330, the bottom of the second valve cavity 90 is provided with the valve assembly 13 and the exhaust guide seat 15, the exhaust guide seat 15 is provided with an exhaust port, the second valve cavity 90 is internally provided with the valve rod 12, the relay piston 19 is sheathed on the valve rod 12, the channel N is arranged in the middle of the valve rod 12, and the exhaust port is communicated with the channel N; the valve assembly 13 is arranged below the relay piston 19, the second valve cavity 90 comprises a C cavity positioned above the relay piston 19 and a B cavity positioned below the relay piston 19, the relay piston 19 moves downwards to open the valve assembly 13 so that the A cavity and the B cavity are communicated, the B cavity is communicated with the air outlet, and the air outlet is communicated to each braking cavity. The air inlet 11 is communicated with an A cavity, and the A cavity and the B cavity are controlled to be communicated and disconnected through a valve assembly 13. The EPB electronic control unit 2 is electrically connected with the pressure reducing solenoid valve 10, the standby solenoid valve 17 and the two-position three-way solenoid valve 18.
The device also comprises a control port 4, wherein the control port 4 is communicated with the C cavity through an air passage; valve rod 12 is arranged in valve cavity 90, relay piston 19 is sleeved on valve rod 12, guide sleeve 121 is also arranged between relay piston 19 and valve rod 12, and guide sleeve 121 extends to exhaust port 29. The N channel runs through the middle part of the valve rod 12, and the valve rod 12 provides a guiding function for the relay piston 19 and also comprises a return spring 14, one end of the return spring 14 is in contact with the exhaust guide seat 15, and the other end of the return spring is in contact with the valve assembly 13 to disconnect the communication between the cavity A and the cavity B. When the cavity C is in an air inlet state, the relay piston 19 moves downwards to abut against the valve assembly 13 and overcome the spring force of the return spring 14, so that the valve assembly 13 is opened, and the cavity A and the cavity B are communicated.
The air taking connector 5 is internally provided with a manual stop valve 50 for forcedly releasing the parking brake, the manual stop valve 50 is communicated with the D cavity, the stop valve 50 comprises a second spring 510 and a second valve core 511, and the second spring 510 pushes the second valve core 511 to enable the stop valve to be in a stop state. The second valve core 511 includes a push rod 512, a forced air leakage opening 513 is formed in the push rod 512, and compressed air in the d cavity is pushed by the push rod 512 to be discharged from the forced air leakage opening 513.
In this embodiment, during installation, the standby electromagnetic valve 17, the two-position three-way electromagnetic valve 18 and the pressure reducing electromagnetic valve 10 are placed and installed from the opening of the upper valve body 3, the bottom of the valve cavity 90 is of an opening structure, the exhaust guide seat 15 is arranged to seal the valve cavity, and the relay piston 19 and the valve assembly 13 are installed from the lower side of the valve cavity 90.
In this embodiment, the first valve cavity 310 is formed on a sidewall of the connecting portion 330. When the first valve core 311 is in an initial state, the first valve core 311 is sealed with the elastic retainer 315, an annular notch is formed in the outer side face of the first valve core 311, after movement, the notch falls into the elastic retainer separating the E cavity from the F cavity, and the E cavity is communicated with the F cavity through a shaft hole in the middle of the elastic retainer. The first piston 6 drives the first valve core 311 to control the connection or disconnection of the E cavity and the F cavity.
The air inlet 11 is communicated with the channel of the cavity A and is internally provided with a one-way valve 9, and the exhaust guide seat 15 is provided with a filter element and muffler assembly 16. The one-way valve 9 cuts off the communication between the A cavity and the E cavity.
In this embodiment, the air outlet includes a first air outlet, a second air outlet, a third air outlet, a fourth air outlet, and an air inlet 11, where the first air outlet and the control port 4 are disposed on the left side of the lower valve body 7; the right side of the lower valve body 7 is provided with a second air outlet; the front side of the lower valve body 7 is provided with a third air outlet and a fourth air outlet; the rear side of the lower valve body 7 is provided with a reserved opening. The control port 4 is connected with an air brake valve. Each air outlet is communicated with the cavity B.
The following description is made of several typical working states of the valve body assembly, and it should be understood that the valve body assembly is not limited to the several working states, and any valve body assembly can be implemented as a functional feature of the valve body assembly.
Driving state:
The pressure reducing electromagnetic valve 10 is not electrified, the standby electromagnetic valve 17 is electrified, the two-position three-way electromagnetic valve 18 is powered off after being electrified for 1s, and compressed air enters from the 1 port and is divided into two paths: one path of the valve is jacked up to open the one-way valve 9 to enter the cavity A; one path passes through the channel to the E cavity and then enters the L cavity through the channel, and when the two-position three-way electromagnetic valve 18 is in a power-on state, the movable iron core assembly three XV in the two-position three-way electromagnetic valve 18 moves to the static iron core assembly three XV by overcoming the action of compression spring force through electromagnetic force; compressed air enters the O cavity from the channel L, the C cavity is inflated through the channel, the electromagnetic force is removed after the two-position three-way valve 18 is electrified for 1s, the movable valve core XV returns to the initial position, the communication of the L cavity and the O cavity is disconnected, the O cavity is communicated with the J cavity, compressed air in the C cavity flows back to the O cavity, then enters the D cavity through the J cavity, the first piston 6 is pushed to move rightwards, the first valve core 311 is driven to move rightwards, when the first piston 6 moves rightwards to the transition step of the first piston cavity 313 and the valve core cavity 312, pushing is stopped, at the moment, the E cavity is communicated with the F cavity, air entering the E cavity through the air inlet 11 directly enters the F cavity, then enters the P cavity through the F cavity, at the moment, the standby piezoelectric magnetic valve 17 is powered off, the valve core assembly IX returns to open the valve port through the action of the spring, and the compressed air reaches the C cavity from the P cavity to the Q cavity. The relay piston 19 moves downwards under the action of compressed air, overcomes the pre-jacking force of the return spring 14, jacks up the valve assembly 13, compressed air in the cavity A enters the cavity B through the jacked-up valve assembly 13, and then the compressed air in the cavity B enters the parking cavity of the corresponding spring brake cylinder through each air outlet, so that the parking brake is released, and the vehicle enters a driving state.
Parking state:
The aim is to vent the compressed air in each spring brake cylinder through the vent of an EPB valve assembly having an internal breathing structure.
At this time, the air inlet 11 is cut off, the standby electromagnetic valve 17 is electrified to cut off the compressed air flowing to the C cavity, the two-position three-way electromagnetic valve 18 is powered off, the first valve core 311 moves leftwards under the action of the first spring 314, the compressed air in the D cavity enters the O cavity through the J cavity and then enters the C cavity through the O cavity, the pressure reducing electromagnetic valve 10 is electrified at this time, the G cavity is communicated with the channel N, the compressed air in the C cavity enters the N channel through the G cavity, and finally the compressed air is discharged through the air outlet 29.
Driving state in anti-superposition mode: the state is the forced release parking mode under the failure state of the electric control mode or the parking state. The standby electromagnetic valve 17, the pressure reducing electromagnetic valve 10 and the two-position three-way electromagnetic valve 18 are not electrified, and compressed air enters the valve cavity A from the 11 ports; when the brake pedal is depressed, the control port 4 is pressurized with air through the passage to the C chamber. The relay piston 19 moves downward under the influence of the compressed air against the compression spring 14 pushing the valve assembly 13. At this time, the compressed air in the cavity A enters the cavity B through the valve assembly which is opened. And the air outlets enter the parking cavities of the corresponding spring brake cylinders, the parking brake is released, and the vehicle enters a driving state.
Example 2
As shown in fig. 9, this embodiment provides an EPB electronic parking brake system, which includes the integrated EPB valve assembly in embodiment 1, and further includes an air reservoir 80, a spring brake cylinder parking chamber 81, and a trailer module 82, wherein the air inlet 11 is connected to the air reservoir 80, the first air outlet 21, the second air outlet 22 are both connected to the spring brake cylinder parking chamber 81, the fourth air outlet 26 is connected to the air inlet of the trailer module 82, the control port 4 is connected to the air brake valve, and the third air outlet 25 is connected to the control port of the trailer module 82.
In summary, the foregoing description is only of the preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the claims should be construed to fall within the scope of the invention.
Claims (6)
1. EPB valve assembly with interior breathing structure is provided with air inlet (11) and gas outlet on the valve body, its characterized in that: the valve body is provided with a first valve cavity (310) for installing a pneumatic control two-position three-way electromagnetic valve (31) and a channel N which is arranged in the valve body and used for exhausting, a first valve core (311) is arranged in the first valve cavity (310), the right end surface of the first valve cavity (310) is provided with a channel K, the channel K is communicated with the channel N, and when the first valve core (311) moves towards the channel K, compressed air between the first valve core (311) and the channel K enters the channel N to be exhausted through the channel K; the EPB valve body comprises an upper valve body (3) and a lower valve body (7), a second valve cavity (90) is formed in the lower valve body (7), a relay piston (19) is arranged in the second valve cavity (90), a C cavity is formed by the upper end surface of the relay piston (19) and the inner wall of the second valve cavity (90), and compressed air in the first valve cavity (310) is discharged from a channel K through the C cavity in the process that the first valve core (311) moves in the direction far away from the channel K; the two-position three-way electromagnetic valve (18) is further included, the first valve cavity (310) comprises a first piston cavity (313) and a valve core cavity (312), the left end of the first piston cavity (313) is provided with a gas taking connector (5), the valve core cavity (312) is divided into an E cavity, an F cavity and an X cavity, the E cavity and the F cavity are controlled to be communicated and disconnected through the first valve core (311), the side wall of the E cavity is provided with a channel which is respectively communicated with the air inlet (11) and the two-position three-way electromagnetic valve (18), the two-position three-way electromagnetic valve (18) is communicated with the C cavity and the first piston cavity (313), and the two-position three-way electromagnetic valve (18) is used for controlling the communication among the C cavity, the E cavity and the first piston cavity (313); the C cavity and the N channel are controlled to be communicated and disconnected by arranging a pressure reducing electromagnetic valve (10); a standby electromagnetic valve (17) is arranged between the F cavity and the C cavity, and the standby electromagnetic valve (17) controls the connection and disconnection of the F cavity and the C cavity; the right end face of the valve core cavity (312) is provided with a first spring (314), a first piston (6) is arranged in a first piston cavity (313), the first piston (6) moves rightwards to drive a first valve core (311) to move rightwards to compress the first spring (314), a D cavity is formed by surrounding the first piston (6), the gas taking connector (5) and the side wall of the first piston cavity (313), the D cavity is communicated with a two-position three-way electromagnetic valve (18), the section of the first piston cavity (313) is larger than the section of the valve core cavity (312), and a limiting step is formed at the joint; the two-position three-way electromagnetic valve (18) comprises an L cavity, an O cavity and a J cavity, when the two-position three-way electromagnetic valve (18) is in an electrified state, the L cavity is communicated with the O cavity, the two-position three-way electromagnetic valve (18) is in a power-off state, and the O cavity is communicated with the J cavity; the J cavity is communicated with the D cavity, the O cavity is communicated with the C cavity, and the E cavity is communicated with the L cavity; the standby electromagnetic valve (17) comprises a P cavity and a Q cavity, the F cavity is communicated with the P cavity, the Q cavity is communicated with the C cavity, and a valve core of the standby electromagnetic valve (17) controls the communication between the P cavity and the Q cavity; the pressure reducing electromagnetic valve (10) comprises a G cavity, the G cavity is communicated with a C cavity, and a valve core of the pressure reducing electromagnetic valve (10) 10 controls the G cavity to be communicated with a channel N.
2. The EPB valve assembly with internal breathing structure according to claim 1, wherein: the first piston cavity (313), the E cavity, the F cavity and the adjacent cavity of the X cavity are separated by arranging an elastic retainer ring (315) and a ventilation sleeve (316), and in an initial state, the valve core is in sealing fit with the retainer ring (315), and the E cavity and the F cavity are separated; in the air inlet state, the first valve core (311) moves rightwards, and the E cavity and the F cavity are communicated with a gap between the first valve core (311) through the check ring (315).
3. The EPB valve assembly with internal breathing structure according to claim 1, wherein: the first piston (6) comprises a piston body (61) and an insertion rod (32) inserted in a first valve core (311), an auxiliary air outlet channel (612) is formed in the insertion rod (32), a channel Y is arranged in the middle of the first valve core (311), an air leakage port (613) is formed in one end, close to the piston body (61), of the inner side wall of the valve core cavity, the air leakage port (613) is communicated with the space in the upper valve body (3), and the air leakage port (613), the valve core cavity (312), the auxiliary air outlet channel (612), the channel Y, the channel K and the channel N are sequentially communicated to form an air leakage channel.
4. The EPB valve assembly with internal breathing structure according to claim 1, wherein: the valve body is internally provided with a connecting part (330), the connecting part (330) separates an installation cavity of the upper valve body (3) from a second valve cavity (90) of the lower valve body (7), the upper end of the upper valve body (3) is sealed with an upper cover assembly (1), an EPB electronic control unit (2) is arranged in the upper valve body (3), a two-position three-way electromagnetic valve (18), a pressure reducing electromagnetic valve (10) and a pressure-standby electromagnetic valve (17) are arranged in the upper valve body (3), the pressure-standby electromagnetic valve is communicated with the C cavity through a channel formed in the connecting part (330), the bottom of the second valve cavity (90) is provided with a valve assembly (13) and an exhaust guide seat (15), the exhaust guide seat (15) is provided with an exhaust port, the second valve cavity (90) is internally provided with a valve rod (12), a relay piston (19) is arranged on the valve rod (12) in a sealing way, and a channel N is arranged in the middle of the valve rod (12) and is communicated with the channel N; the valve assembly (13) is arranged below the relay piston (19), the second valve cavity (90) comprises a C cavity positioned above the relay piston (19) and a B cavity positioned below the relay piston (19), the B cavity is communicated with the air outlet, the air inlet (11) is communicated with an A cavity, and the A cavity and the B cavity are controlled to be communicated and disconnected through the valve assembly (13).
5. The EPB valve assembly with internal breathing structure according to claim 1, wherein: a one-way valve (9) is arranged in a channel of the air inlet (11) communicated with the cavity A, a manual stop valve for forcedly releasing the parking brake is arranged in the air taking joint (5), and the manual stop valve is communicated with the cavity D; the device also comprises a control port (4), and the control port (4) is communicated to the C cavity through an air passage.
6. The electronic parking braking system is characterized in that: the EPB valve assembly with the internal breathing structure according to any one of claims 1 to 5 is included, the air outlet comprises a first air outlet (21), a second air outlet (22), a third air outlet (25) and a fourth air outlet (26), the electronic parking brake system further comprises an air storage cylinder (80), a spring brake cylinder parking cavity (81) and a trailer module (82), the air inlet (11) is connected with the air storage cylinder (80), the first air outlet (21) and the second air outlet (22) are both connected with the spring brake cylinder parking cavity (81), the fourth air outlet (26) is connected with the air inlet of the trailer module (82), the control port (4) is connected with the air brake valve, and the third air outlet (25) is connected with the control port of the trailer module (82).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811158770.3A CN109305156B (en) | 2018-09-30 | 2018-09-30 | EPB valve assembly with internal respiration structure and electronic parking brake system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811158770.3A CN109305156B (en) | 2018-09-30 | 2018-09-30 | EPB valve assembly with internal respiration structure and electronic parking brake system |
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| CN109305156A CN109305156A (en) | 2019-02-05 |
| CN109305156B true CN109305156B (en) | 2024-05-14 |
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| CN201811158770.3A Active CN109305156B (en) | 2018-09-30 | 2018-09-30 | EPB valve assembly with internal respiration structure and electronic parking brake system |
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| CN111853111B (en) * | 2020-07-17 | 2021-09-03 | 中车青岛四方车辆研究所有限公司 | Brake cylinder |
| CN114802159B (en) * | 2022-05-13 | 2023-07-14 | 中车齐齐哈尔车辆有限公司 | Emergency valve |
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| CN108099888A (en) * | 2017-12-22 | 2018-06-01 | 易孝威 | A kind of brake main valve for adapting to the different convertible gas circuits of road conditions |
| CN207673761U (en) * | 2017-12-27 | 2018-07-31 | 嘉兴盛鼎机械有限公司 | A kind of improved type brake air chamber internal respiration device |
| CN209381977U (en) * | 2018-09-30 | 2019-09-13 | 浙江万安科技股份有限公司 | EPB valve assembly and EPB electronic brake system with internal respiration structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201494433U (en) * | 2009-09-27 | 2010-06-02 | 蒋伟荣 | Piston shaft of internal respiration brake chamber |
| CN202091411U (en) * | 2011-07-11 | 2011-12-28 | 宜宾三江机械有限责任公司 | Energy-storage piston type spring braking suction and exhaust structure device in air chamber |
| CN205113318U (en) * | 2015-08-26 | 2016-03-30 | 瑞立集团瑞安汽车零部件有限公司 | Exhaust brake valve with internal respiration structure |
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| CN209381977U (en) * | 2018-09-30 | 2019-09-13 | 浙江万安科技股份有限公司 | EPB valve assembly and EPB electronic brake system with internal respiration structure |
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