Vehicle brake system

Abstract

The invention relates to the technical field of railway vehicles, and particularly discloses a vehicle braking system. The vehicle braking system comprises at least one brake, the brake comprises a driving cylinder, the driving cylinder comprises a piston cavity, a piston matched with the piston cavity and a cylinder body part forming the piston cavity in a surrounding mode, the piston divides the piston cavity where the piston is located into a first cavity and a second cavity, and the driving cylinder further comprises an elastic piece arranged in the second cavity; the communicating piece comprises a communicating cavity, a first port, a second port and a third port, the first port, the second port and the third port are communicated with the communicating cavity, the second port is communicated with the second cavity, and the third port is used for being communicated with the atmosphere; the control valve is used for controlling whether the compressed air source and the first port communicate with the first cavity or not. When the vehicle braking system provided by the invention is used, the second cavity does not need to suck air from the atmosphere, so that adverse effects on the driving cylinder after impurities such as dust and water contained in the air enter the second cavity are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicles, and in particular to a vehicle braking system. Background Art

[0002] Existing rail vehicles are provided with a vehicle braking system including brakes, which can apply brakes to the wheels of the rail vehicle to slow down or stop the rail vehicle.

[0003] The brake includes a drive cylinder for outputting a braking force, the drive cylinder includes a piston chamber and a piston used in conjunction with the piston chamber, the piston chamber is divided into a first chamber and a second chamber by the piston, and an elastic member for enabling the piston to be reset is provided in the second chamber. By inputting compressed gas into the first chamber, the piston can be driven to move toward the side where the second chamber is located, and when the compressed gas in the first chamber is released outward, the elastic member will drive the piston to move and reset to the side where the first chamber is located.

[0004] The existing brake is provided with a breathing hole connecting the second chamber with the atmosphere. When the piston moves toward the side where the second chamber is located, the volume of the second chamber becomes smaller, and the air in it is discharged into the atmosphere through the breathing hole. When the piston moves toward the side where the first chamber is located, the volume of the second chamber becomes larger, and the air in the atmosphere enters the second chamber through the breathing hole. Impurities such as dust and moisture contained in the air will have an adverse effect on the driving cylinder after entering the second chamber. Summary of the invention

[0005] An object of the present invention is to provide a vehicle brake system in which air from the atmosphere does not need to enter the second chamber when the volume of the second chamber increases.

[0006] To achieve the above object, the present invention provides a vehicle braking system, comprising:

[0007] At least one brake, the brake comprising a drive cylinder, the drive cylinder comprising a piston chamber, a piston matched with the piston chamber, and a cylinder body portion surrounding the piston chamber, the piston dividing the piston chamber where it is located into a first chamber and a second chamber, the drive cylinder further comprising an elastic member arranged in the second chamber, the two ends of the elastic member in the elastic expansion and contraction direction respectively abutting against the cylinder body portion and the piston;

[0008] A connecting piece, the connecting piece comprising a connecting cavity, a first port connected to the connecting cavity, a second port and a third port, the second port being connected to the second chamber, and the third port being used to connect to the atmosphere;

[0009] A control valve is used to control whether the compressed gas source and the first port are connected to the first chamber.

[0010] As a further improvement of the present invention, the vehicle braking system includes a first air circuit connecting the control valve and the first chamber, a second air circuit connecting the control valve and the first port, and a third air circuit connecting the second chamber and the second port, and the control valve is used to control whether the compressed air source and the second air circuit are connected to the first air circuit.

[0011] As a further improvement of the present invention, the vehicle braking system also includes a throttle valve, and the throttle valve is arranged on the third air path.

[0012] As a further improvement of the present invention, at least two drive cylinders are provided, at least two first air circuits are provided, each of the first air circuits is connected to a control valve and a first chamber of the drive cylinder, and the third air circuit includes a third main circuit connected to the second port, and at least two third branches respectively connected to the third main circuit and the second chambers of at least two drive cylinders.

[0013] As a further improvement of the present invention, one throttle valve is provided, and the throttle valve is arranged on the third main line.

[0014] As a further improvement of the present invention, the brake comprises two driving cylinders, the two driving cylinders in the same brake are respectively a brake cylinder and a parking cylinder, and the brake cylinder and the parking cylinder are arranged in coordination with each other.

[0015] As a further improvement of the present invention, the connecting piece further includes an air purification part, and the connecting piece is configured so that the gas entering the third port can enter the connecting cavity only after passing through the air purification part.

[0016] As a further improvement of the present invention, the brake also includes a connecting frame for connecting the driving cylinder to the vehicle, the connecting frame is formed with a frame passage for connecting to a compressed air source, the driving cylinder is formed with a main body passage connecting the first chamber and the frame passage, and the first air passage includes the frame passage and the main body passage.

[0017] As a further improvement of the present invention, the connecting frame includes a connecting shaft passing through the connecting part and with both ends located outside the connecting part, and a frame body used to be connected to the vehicle, the frame body is connected to the part of the connecting shaft located outside the connecting part, and the frame body passage is formed on the frame body.

[0018] The present invention also provides a vehicle braking control method, which uses the above-mentioned vehicle braking system and comprises the following steps:

[0019] When the first chamber and the first port are not connected, compressed gas is input into the first chamber of the driving cylinder to drive the piston to overcome the elastic force of the elastic member and move toward the side where the second chamber is located;

[0020] The first chamber and the first port are connected to release the compressed gas in the first chamber until the elastic member drives the piston to move a predetermined distance toward the side where the first chamber is located, and part of the compressed gas released from the first chamber is discharged into the atmosphere, and the other part enters the second chamber.

[0021] Beneficial effects:

[0022] When the vehicle braking system provided by the present invention is in use, when the elastic member drives the piston to move toward the side where the first chamber is located to reset, part of the compressed air in the first chamber flows into the atmosphere, and the other part flows into the second chamber to eliminate the negative pressure in the second chamber. In this way, the second chamber does not need to inhale air from the atmosphere, thereby avoiding the adverse effects of impurities such as dust and moisture contained in the air entering the second chamber and causing adverse effects on the driving cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of a vehicle braking system provided by an embodiment of the present invention;

[0024] Figure 2 A side view of a brake provided by an embodiment of the present invention;

[0025] Figure 3 for Figure 1 A cross-sectional view of the internal structure of the brake;

[0026] Figure 4 A schematic structural diagram of a vehicle braking system provided by another embodiment of the present invention;

[0027] Figure 5 for Figure 1 A sectional view of a partial structure of the brake;

[0028] Figure 6 for Figure 1 Another cross-sectional view of the internal structure of the brake;

[0029] Figure 7 for Figure 6 The enlarged schematic diagram of point A in the middle;

[0030] Figure 8 for Figure 2 Another cross-sectional view of the internal structure of the brake;

[0031] Fig. 9 for Figure 2 Top view of the brake in.

[0032] In the figure:

[0033] 100. Vehicle braking system;

[0034] 10. Brake;

[0035] 1. Driving cylinder; 1a. Braking cylinder; 1b. Parking cylinder; 11. Piston chamber; 11a. Braking piston chamber; 11b. Parking piston chamber; 111. First chamber; 112. Second chamber; 12. Piston; 12a. Braking piston; 12b. Parking piston; 13. Cylinder body; 13a. Braking cylinder body; 13b. Parking cylinder body; 14. Connecting part; 15. Main body passage; 15a. First main body passage; 15b. Second main body passage; 151. Intermediate chamber; 151a. First intermediate chamber; 151b. Second intermediate chamber; 152. Connecting passage; 152a. First connecting passage; 152b. Second connecting passage; 153. Connecting port; 153a. First connecting port; 153b. Second connecting port; 16. Partition; 17. Flexible tube.

[0036] 2. Connecting frame; 21. Frame passage; 21a. First frame passage; 21b. Second frame passage; 22. Connecting shaft; 221. Sealing ring; 23. Frame; 231. Protruding portion; 232. First frame portion; 233. Second frame portion; 234. Connecting hole; 24. Breathing hole;

[0037] 3. Seals;

[0038] 4. elastic member; 4a. first elastic member; 4b. second elastic member;

[0039] 5. Clamp arm; 51. Brake shoe;

[0040] 20, connecting piece; 201, first port; 202, second port; 203, third port; 204, connecting cavity;

[0041] 30. Control valve;

[0042] 40. Throttle valve;

[0043] 50. Air purification department;

[0044] 60. Compressed air source;

[0045] S1, first air circuit; S1a, brake air circuit; S1b, parking air circuit; S11, first main circuit; S12, first branch circuit; S2, second air circuit; S3, third air circuit; S31, third main circuit; S32, third branch circuit. DETAILED DESCRIPTION

[0046] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings. However, the embodiments do not limit the present invention, and any changes in mechanism, method, or function made by a person skilled in the art according to the embodiments are all within the protection scope of the present invention.

[0047] The terms used herein, such as "upper", "lower", "left", "right", "front", "back", etc., which indicate relative spatial positions, are used for the purpose of convenience to describe the relationship between one feature and another feature as shown in the accompanying drawings. It is understood that, depending on the placement of the product, the terms of relative spatial positions may be intended to include different orientations other than those shown in the drawings, and should not be construed as limitations on the claims. In addition, the descriptor "horizontal" used herein is not completely equivalent to being perpendicular to the direction of gravity, and a certain angle of inclination is allowed.

[0048] like Figure 1-3 As shown, an embodiment of the present invention provides a vehicle braking system 100, which can be used on a rail vehicle to control the rail vehicle to decelerate and stop.

[0049] The vehicle brake system 100 includes at least one brake 10, a connecting piece 20 and a control valve 30. The brake 10 includes a drive cylinder 1, which includes a piston chamber 11, a piston 12 matched with the piston chamber 11, and a cylinder body 13 surrounding the piston chamber 11. The piston 12 divides the piston chamber 11 where it is located into a first chamber 111 and a second chamber 112. The drive cylinder 1 also includes an elastic member 4 arranged in the second chamber 112, and the two ends of the elastic member 4 in the elastic expansion direction respectively abut the cylinder body 13 and the piston 12.

[0050] After compressed gas is input into the first chamber 111, the pressure of the compressed gas will drive the piston 12 to overcome the elastic force of the elastic member 4 and move toward the side where the second chamber 112 is located, so that the volume of the first chamber 111 increases and the volume of the second chamber 112 decreases. After the compressed gas in the first chamber 111 is released outward, the elastic member 4 will drive the piston 12 to move and reset toward the side where the first chamber 111 is located, so that the volume of the second chamber 112 increases and the volume of the first chamber 111 decreases.

[0051] The connecting member 20 includes a connecting cavity 204, a first port 201, a second port 202 and a third port 203 connected to the connecting cavity 204, wherein the second port 202 is connected to the second chamber 112, and the third port 203 is used to connect to the atmosphere. The control valve 30 is used to control whether the compressed gas source 60 and the first port 201 are connected to the first chamber 111.

[0052] After the control valve 30 connects the compressed gas source 60 with the first chamber 111, the compressed gas provided by the compressed gas source 60 can enter the first chamber 111, and the pressure of the compressed gas will drive the piston 12 to overcome the elastic force of the elastic member 4 and move toward the side where the second chamber 112 is located, so that the volume of the first chamber 111 increases and the volume of the second chamber 112 decreases, and the air in the second chamber 112 will flow to the second port 202 of the connecting member 20, and then be discharged into the atmosphere from the third port 203 of the connecting member 20.

[0053] After the control valve 30 disconnects the compressed gas source 60 from the first chamber 111 and connects the first chamber 111 to the first port 201, the compressed gas in the first chamber 111 will gradually enter the connecting chamber 204 through the first port 201 and be discharged into the atmosphere through the third port 203, thereby reducing the pressure of the compressed gas in the first chamber 111. When the force of the compressed gas on the piston 12 cannot overcome the elastic force of the elastic member 4 in the second chamber 112, the elastic member 4 will drive the piston 12 to move toward the side where the first chamber 111 is located. When the piston 12 moves toward the side where the first chamber 111 is located, the volume of the second chamber 112 increases, and negative pressure is generated therein. The negative pressure generated in the second chamber 112 is less than the atmospheric pressure, which will cause the compressed gas in the first chamber 111 to tend to flow into the second chamber 112 through the connecting member 20 instead of being discharged into the atmosphere.

[0054] With the above arrangement, when the elastic member 4 drives the piston 12 to move and reset toward the side where the first chamber 111 is located, part of the compressed air in the first chamber 111 flows into the atmosphere, while the other part flows into the second chamber 112 to eliminate the negative pressure in the second chamber 112. In this way, the second chamber 112 does not need to inhale air from the atmosphere, thereby avoiding the adverse effects of impurities such as dust and moisture contained in the air entering the second chamber 112 and causing adverse effects on the driving cylinder 1.

[0055] Specifically, the vehicle braking system 100 includes a first air circuit S1 connecting the control valve 30 and the first chamber 111, a second air circuit S2 connecting the control valve 30 and the first port 201, and a third air circuit S3 connecting the second chamber 112 and the second port 202. The control valve 30 is used to control whether the compressed air source 60 and the second air circuit S2 are connected to the first air circuit S1.

[0056] When the first gas circuit S1 is connected to the compressed gas source 60 but not to the second gas circuit S2, the compressed gas provided by the compressed gas source 60 can enter the first chamber 111 through the first gas circuit S1, thereby pushing the piston 12 to move, and the compressed gas entering the first chamber 111 will not be released outward; when the first gas circuit S1 and the second gas circuit S2 are connected, the compressed gas in the first chamber 111 will flow to the connecting cavity 204 of the connecting piece 20 through the first gas circuit S1 and the second gas circuit S2 in turn, and then flow into the atmosphere through the third port 203 and enter the second chamber 112 through the third gas circuit S3.

[0057] The vehicle brake system 100 further includes a throttle valve 40, which is disposed on the third gas path S3. As described above, when the elastic member 4 drives the piston 12 to move and reset toward the side where the first chamber 111 is located, part of the compressed gas in the first chamber 111 will enter the second chamber 112 through the third gas path S3. The throttle valve 40 is disposed on the third gas path S3 to control the flow rate and flow velocity of the compressed gas entering the second chamber 112, so that the compressed gas can enter the second chamber 112 in a controllable manner.

[0058] In this embodiment, at least two drive cylinders 1 are provided, at least two first gas paths S1 are provided, the first chamber 111 of each drive cylinder 1 is connected to the control valve 30 through one first gas path S1, and the third gas path S3 includes a third main path S31 connected to the second port 202, and at least two third branch paths S32 respectively connected to the third main path S31 and the second chambers 112 of at least two drive cylinders 1. In this way, the control valve 30 can control each drive cylinder 1 through at least two first gas paths S1.

[0059] In this embodiment, the brake 10 includes two drive cylinders 1. The two drive cylinders 1 in the same brake 10 are brake cylinder 1a and parking cylinder 1b, respectively. The brake cylinder 1a and the parking cylinder 1b are arranged in coordination. The first chamber 111 of the brake cylinder 1a is connected to the control valve 30 through a first gas path S1, and the first chamber 111 of the parking cylinder 1b is connected to the control valve 30 through another first gas path S1. For the convenience of description, the first gas path S1 connecting the control valve 30 and the first chamber 111 of the brake cylinder 1a is called the brake gas path S1a, and the first gas path S1 connecting the control valve 30 and the first chamber 111 of the parking cylinder 1b is called the parking gas path S1b. The control valve 30 can control whether the compressed gas source 60 and the second gas path S2 are connected to the brake gas path S1a, and can also control whether the compressed gas source 60 and the second gas path S2 are connected to the parking gas path S1b. The compressed gas in the communication chamber 204 can enter the two second chambers 112 through the third main path S31 and the two third branch paths S32. Thus, the brake piston 12a of the brake cylinder 1a and the parking piston 12b of the parking cylinder 1b can be controlled to move independently through the control valve 30. For example, when the brake 10 is braking, the brake piston 12a of the brake cylinder 1a can move first, and then the parking piston 12b of the parking cylinder 1b moves.

[0060] The number of connecting pieces 20 , control valves 30 and second air paths S2 is less than the number of driving cylinders 1 , and each of the three may be provided with one. In other words, a control structure consisting of a connecting piece 20 , a control valve 30 and a second air path S2 corresponds to at least two driving cylinders 1 .

[0061] When the number of the driving cylinders 1 is greater than two, the first gas path S1 may be configured to connect the control valve 30 and the first chamber 111 of at least one driving cylinder 1 .

[0062] It can be imagined that in this embodiment, the number of brakes 10 is not limited to one, and multiple brakes 10 may be provided, that is, the vehicle braking system 100 can control multiple brakes 10 to operate to slow down and stop the rail vehicle.

[0063] In some embodiments, the brake cylinder 10 may also include only one driving cylinder 1, and the driving cylinder 1 is the brake cylinder 1a.

[0064] like Figure 4 As shown, in other embodiments of the present invention, the first gas circuit S1 is not provided with at least two separate circuits, but includes a first main circuit S11 connected to the control valve 30, and at least two first branch circuits S12 respectively connected to the first main circuit S11 and the first chambers 111 of at least two drive cylinders 1, and the third gas circuit S3 includes a third main circuit S31 connected to the second port 202, and at least two third branch circuits S32 respectively connected to the third main circuit S31 and the second chambers 112 of at least two drive cylinders 1.

[0065] Taking the case where two drive cylinders 1 are provided and two first branches S12 and two third branches S32 are also provided as an example, the compressed air provided by the compressed air source 60 can enter the first chambers 111 of the two drive cylinders 1 through the first main path S11 and the two first branches S12 after entering the control valve 30; when the elastic member 4 drives the piston 12 to move toward the side where the first chamber 111 is located and reset, the compressed air in the first chambers 111 of the two drive cylinders 1 can enter the control valve 30 through the two first branches S12 and the first main path S11, and then enter the connecting chamber 204 of the connecting member 20 from the control valve 30 through the second air path S2, and then part of the compressed gas will enter the two second chambers 112 through the third main path S31 and the two third branches S32.

[0066] In this embodiment, one throttle valve 40 is provided, and the throttle valve 40 is provided on the third main path S31.

[0067] In other embodiments, the throttle valve 40 may also be disposed on the third branch S32 to control the flow rate and flow velocity of the gas in each third branch S32. In this case, the number of the throttle valves 40 should be the same as the number of the third branches S32.

[0068] The connecting piece 20 further includes an air purification unit 50 . The connecting piece 20 is configured such that the gas entering the third port 203 can enter the connecting cavity 204 only after passing through the air purification unit 50 .

[0069] In this embodiment, the air purification unit 50 is an air dryer for removing moisture from the gas passing through it. When a small amount of air enters the communication cavity 204 from the third port 203, the air purification unit 50 can remove moisture from the air entering, thereby preventing the air from entering the drive cylinder 1 and affecting the drive cylinder 1.

[0070] It can be imagined that the gas in the communication cavity 204 can be discharged from the third port 203 only after passing through the air purification unit 50. The above-mentioned air purification unit 50 can also have the function of filtering impurities such as dust in the air.

[0071] Continue to combine Figure 2-3 As shown in 5-9, the brake further includes a connecting frame 2 connected to the drive cylinder 1, and the drive cylinder 1 is connected to the vehicle through the connecting frame 2. Specifically, the drive cylinder 1 can be connected to the bogie of the rail vehicle through the connecting frame 2.

[0072] The drive cylinder also includes a connecting portion 14 connecting the cylinder body 13 and the connecting frame 2. The connecting frame 2 is formed with a frame passage 21 for connecting to the compressed air source 60. The drive cylinder 1 is formed with a main body passage 15 connecting the first chamber 111 and the frame passage 21.

[0073] When the brake 10 of this embodiment is in use, the connecting frame 2 may be connected to an air pipe connecting the frame body passage 21 and the compressed air source 60. The compressed air provided by the compressed air source 60 can enter the first chamber 111 through the frame body passage 21 and the main body passage 15 in sequence, so that the piston 12 moves, and the drive cylinder 1 can output the braking force outward. As described above, the connecting frame 2 is connected to the bogie of the rail vehicle. During the operation of the rail vehicle, the position of the connecting frame 2 relative to the rail vehicle can remain unchanged. In the above setting, the air pipe is connected to the connecting frame 2, so that during the operation of the rail vehicle, even if the drive cylinder 1 rotates relative to the connecting frame 2, the position of the air pipe will not be affected, thereby avoiding the phenomenon that the air pipe is damaged due to pulling.

[0074] It can be imagined that a piston rod is connected to the piston 12, and the driving cylinder 1 specifically outputs power to the outside through the piston rod.

[0075] The main passage 15 includes an intermediate cavity 151 formed by the connecting portion 14 and the cylinder body portion 13, a connecting channel 152 opened on the connecting portion 14 and connecting the intermediate cavity 151 and the frame passage 21, and a connecting port 153 opened on the cylinder body portion 13 and connecting the intermediate cavity 151 and the first chamber 111. The compressed gas output by the compressed gas source 60 can enter the first chamber 111 through the frame passage 21, the connecting channel 152, the intermediate cavity 151, and the connecting port 153 in sequence.

[0076] Further, the connecting frame 2 includes a connecting shaft 22 and a frame body 23. The connecting shaft 22 passes through the connecting portion 14 and both ends are located outside the connecting portion 14. The frame body 23 is connected to the portion of the connecting shaft 22 located outside the connecting portion 14, that is, the two sides of the axial direction of the connecting shaft 22. The frame body 23 is used to connect to the vehicle, specifically, the frame body 23 is used to connect to the bogie of the rail vehicle. With the above arrangement, the connecting frame 2 can connect the drive cylinder 1 to the bogie of the rail vehicle, and the frame body passage 21 is formed on the frame body 23.

[0077] The frame body 23 includes a protruding portion 231 located at one side of the connecting shaft 22 in the radial direction. The frame body passage 21 is formed on the protruding portion 231 so as to be connected with the intermediate cavity 151 through the communicating channel 152 .

[0078] Specifically, the frame body 23 includes two first frame body parts 232 respectively connected to both sides of the connecting shaft 22 in the axial direction and two second frame body parts 233 connecting the two first frame body parts 232. The two first frame body parts 232 generally extend in a direction perpendicular to the connecting shaft 22. The two first frame body parts 232 are each provided with a connecting hole 234. The frame body 23 is specifically connected to the bogie of the rail vehicle through the connecting hole 234. Two connecting holes 234 may be provided on each first frame body part 232. The two second frame body parts 233 extend from one first frame body part 232 to the other first frame body part 232 and are respectively located on both sides of the connecting shaft 22. The above-mentioned protruding portion 231 is formed on one of the two second frame body parts 233.

[0079] In this embodiment, the connecting shaft 22 is arranged through the middle cavity 151, that is, part of the connecting shaft 22 is located in the middle cavity 151. The driving cylinder 1 may further include a sealing ring 221 located between the connecting shaft 22 and the connecting portion 14, and the sealing ring 221 may prevent the compressed gas in the middle cavity 151 from leaking outward from the gap between the connecting shaft 22 and the connecting portion 14.

[0080] The brake 10 further includes an annular seal 3, which is disposed between the connecting portion 14 and the connecting frame 2 and surrounds the frame passage 21, and can prevent leakage of compressed gas during the process of flowing from the frame passage 21 to the main body passage 15. The seal 3 can be made of flexible materials such as rubber and silicone.

[0081] In other embodiments, the frame passage 21 may also be disposed on the connecting shaft 22 . In this case, the connecting passage 152 may not be provided, and the frame passage 21 is directly connected to the middle cavity 151 .

[0082] When the piston 12 moves toward the side where the second chamber 112 is located, the volume of the second chamber 112 decreases, and the gas in the second chamber 112 needs to be discharged outwardly. When the piston 12 moves toward the side where the first chamber 111 is located, the volume of the second chamber 112 increases, and gas needs to enter the second chamber 112. In this embodiment, the brake cylinder 10 also includes a breathing air path for connecting the second chamber 112 and the second port 202.

[0083] Specifically, the breathing gas circuit includes a breathing hole 24 opened on the frame 23 for communicating with the second port 202, and a breathing passage (not shown in the figure) opened on the driving cylinder 1 for communicating with the second chamber 112 and the breathing hole 24. When the breathing hole 24 and the breathing passage are spaced a certain distance apart, the breathing hole 24 and the breathing passage can be connected through the flexible tube 17.

[0084] As described above, the two driving cylinders 1 on the same brake 20 are matched brake cylinders 1a and parking cylinders 1b. Correspondingly, the piston chamber 11 includes a brake piston chamber 11a and a parking piston chamber 11b, the piston 12 includes a brake piston 12a and a parking piston 12b, the cylinder body 13 includes a brake cylinder body 13a surrounding the brake piston chamber 11a, and a parking cylinder body 13b surrounding the parking piston chamber 11b. The brake piston 12a and the brake piston chamber 11a are matched, and the parking piston 12b and the parking piston chamber 11b are matched. The elastic member 4 includes a first elastic member 4a disposed in the second chamber 112 of the brake piston chamber 11a and a second elastic member 4b disposed in the second chamber 112 of the parking piston chamber 11b.

[0085] In this embodiment, the brake 10 is a clamp type brake 10, and the brake 10 also includes a pair of clamp arms 5 connected to opposite sides of the driving cylinder 1 and driven to open and close by the driving cylinder 1. The clamp arms 5 are provided with brake shoes 51, and the axles connected to the wheels of the rail vehicle are connected with friction discs. When the driving cylinder 1 drives the pair of clamp arms 5 to close to clamp the friction disc, the brake shoes 51 will be in close contact with the friction disc, thereby reducing the rotation speed of the wheels of the rail vehicle until the rail vehicle stops running.

[0086] Specifically, the brake cylinder 1a is used to drive a pair of clamp arms 5 to close to clamp the friction disc. After the rail vehicle stops running, the parking cylinder 1b can make the brake cylinder 1a included in the state of clamping the wheel, so that the rail vehicle cannot move and is in a parking state.

[0087] In other embodiments, the brake 10 may also be a tread type brake.

[0088] As described above, the drive cylinder 1 includes a brake cylinder 1a and a parking cylinder 1b, so correspondingly, the frame passage 21 includes a first frame passage 21a and a second frame passage 21b, and the main body passage 15 includes a first main body passage 15a connecting the first frame passage 21a and the brake piston chamber 11a, and a second main body passage 15b connecting the second frame passage 21b and the parking piston chamber 11b.

[0089] Specifically, the intermediate chamber 151 is divided into a first intermediate chamber 151a and a second intermediate chamber 151b by a partition 16, the connecting channel 152 includes a first connecting channel 152a connecting the first frame passage 21a and the first intermediate chamber 151a, and a second connecting channel 152b connecting the second frame passage 21b and the second intermediate chamber 151b. The connecting port 153 includes a first connecting port 153a connecting the first intermediate chamber 151a and the first chamber 111 of the brake piston chamber 11a, and a second connecting port 153b connecting the second intermediate chamber 151b and the first chamber 111 of the parking piston chamber 11b. The above-mentioned first main body passage 15a includes the first connecting channel 152a, the first intermediate chamber 151a and the first connecting port 153a, and the above-mentioned second main body passage 15b includes the second connecting channel 152b, the second intermediate chamber 151b and the second connecting port 153b.

[0090] The breathing air path includes a first breathing air path connecting the second chamber 112 of the brake cylinder 1a and the breathing hole 24, and a second breathing air path connecting the second chamber 113 of the parking cylinder 1b and the breathing hole 24. In a specific configuration, the first breathing air path and the second breathing air path can be combined and then connected to the breathing hole 24 through a flexible tube 17.

[0091] It can be seen that in Figure 1 In the illustrated embodiment, the first gas path S1 includes the frame passage 21 and the main body passage 15. Specifically, one of the two first gas paths S1 includes the first frame passage 21a and the first main body passage 15a, and the other includes the second frame passage 21b and the second main body passage 15b. Figure 4 In the embodiment shown, the first branch S12 includes the frame passage 21 and the main body passage 15. Specifically, one of the two first branches S12 includes the first frame passage 21a and the first main body passage 15a, and the other includes the second frame passage 21b and the second main body passage 15b. The third air path S3 includes the breathing air path.

[0092] The present invention also provides a vehicle braking control method, which uses the above-mentioned vehicle braking system 100 and includes the following steps:

[0093] When the first chamber 111 and the first port 201 are not connected, compressed gas is input into the first chamber 111 of the driving cylinder 1, so that the piston 12 overcomes the elastic force of the elastic member 4 and moves toward the side where the second chamber 112 is located;

[0094] The first chamber 111 and the first port 201 are connected to release the compressed gas in the first chamber 111 until the elastic member 4 drives the piston 12 to move a predetermined distance toward the side of the first chamber 111. Part of the compressed gas released from the first chamber 111 is discharged into the atmosphere, and the other part enters the second chamber 112.

[0095] By adopting the above method, when the elastic member 4 drives the piston 12 to move toward the side where the first chamber 111 is located, part of the compressed gas released from the first chamber 111 will enter the second chamber 112 to eliminate the negative pressure in the second chamber 112. The second chamber 112 does not need to inhale air from the atmosphere, thereby avoiding the adverse effects of impurities such as dust and moisture contained in the air entering the second chamber 112 and causing adverse effects on the driving cylinder 1.

[0096] It should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0097] The above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person skilled in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A vehicle braking system, characterized in that: include: At least one brake, the brake comprising a drive cylinder, the drive cylinder comprising a piston chamber, a piston matched with the piston chamber, and a cylinder body portion surrounding the piston chamber, the piston dividing the piston chamber where it is located into a first chamber and a second chamber, the drive cylinder further comprising an elastic member arranged in the second chamber, the two ends of the elastic member in the elastic expansion and contraction direction respectively abutting against the cylinder body portion and the piston; A connecting piece, the connecting piece comprising a connecting cavity, a first port connected to the connecting cavity, a second port and a third port, the second port being connected to the second chamber, and the third port being used to connect to the atmosphere; A control valve is used to control whether the compressed gas source and the first port are connected to the first chamber.

2. The vehicle braking system according to claim 1, characterized in that: The vehicle braking system includes a first air circuit connecting the control valve and the first chamber, a second air circuit connecting the control valve and the first port, and a third air circuit connecting the second chamber and the second port. The control valve is used to control whether the compressed air source and the second air circuit are connected to the first air circuit.

3. The vehicle braking system according to claim 2, characterized in that: The vehicle braking system further includes a throttle valve, which is disposed on the third air path.

4. The vehicle braking system according to claim 3, characterized in that: The drive cylinders are provided with at least two, the first gas circuits are provided with at least two, each of the first gas circuits is connected to a control valve and a first chamber of the drive cylinder, and the third gas circuit includes a third main circuit connected to the second port, and at least two third branches respectively connected to the third main circuit and the second chambers of at least two drive cylinders.

5. The vehicle braking system according to claim 4, characterized in that: The throttle valve is provided with one, and the throttle valve is arranged on the third main line.

6. The vehicle braking system according to claim 4, characterized in that: The brake comprises two driving cylinders. The two driving cylinders in the same brake are respectively a brake cylinder and a parking cylinder. The brake cylinder and the parking cylinder are arranged in coordination with each other.

7. The vehicle braking system according to claim 1, characterized in that: The connecting piece further includes an air purification part, and the connecting piece is configured such that the gas entering the third port can enter the connecting cavity only after passing through the air purification part.

8. The vehicle braking system according to claim 2, characterized in that: The brake also includes a connecting frame for connecting the drive cylinder to a vehicle, the connecting frame forming a frame passage for connecting to a compressed air source, the drive cylinder forming a main body passage connecting the first chamber and the frame passage, the first air passage including the frame passage and the main body passage.

9. The vehicle braking system according to claim 8, characterized in that: The connecting frame includes a connecting shaft passing through the connecting portion and having two ends located outside the connecting portion, and a frame body for connecting to the vehicle. The frame body is connected to a portion of the connecting shaft located outside the connecting portion, and the frame body passage is formed on the frame body.

10. A vehicle braking control method, characterized in that: The vehicle braking control method uses the vehicle braking system according to any one of claims 1 to 9 and comprises the following steps: When the first chamber and the first port are not connected, compressed gas is input into the first chamber of the driving cylinder to drive the piston to overcome the elastic force of the elastic member and move toward the side where the second chamber is located; The first chamber and the first port are connected to release the compressed gas in the first chamber until the elastic member drives the piston to move a predetermined distance toward the side where the first chamber is located, and part of the compressed gas released from the first chamber is discharged into the atmosphere, and the other part enters the second chamber.

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