Bogie and rail vehicle with four-track return device

Abstract

The application discloses a bogie with four-rail return flow device and a railway vehicle, the bogie comprising a cross beam and side beams arranged at both ends of the cross beam, the side beams comprising upper cover plates and lower cover plates arranged at intervals, inner and outer vertical plates and reinforcing rib plates being connected between the upper cover plates and the lower cover plates, the upper cover plates and the lower cover plates extending towards the cross beam and forming a box structure with the vertical plates, two out-of-plane surfaces of the box structure and the inner side surfaces of the side beams being each provided with a brake hanger forging to form a brake hanger, and the mounting block being provided with the four-rail return flow device, the four-rail return flow device being located within the vehicle outline limit, the four-rail return flow device comprising a flat shell and a return flow slider for slidingly connecting four rails, the return flow slider being connected with a return flow cable, the inside of the shell being provided with a control circuit and a pneumatic driving assembly, the pneumatic driving assembly being connected with the return flow slider, and the control circuit being used for sending a control signal to the pneumatic driving assembly to drive the pneumatic driving assembly to drive the return flow slider to be separated from or contacted with the four rails.

Description

Technical Field

[0001] This invention relates to the field of rail vehicle technology, and in particular to a bogie and rail vehicle with a four-rail return device. Background Technology

[0002] For high-speed, high-capacity urban rail transit vehicles, the vicinity of their lines inevitably contains precision instruments, high-risk factories, metal buildings, and highly sensitive oil and gas metal pipelines. Excessive stray current under the vehicles can cause corrosion, damage, and interference. Therefore, adopting a four-rail return scheme for certain specific lines can reduce the generation of stray current. Summary of the Invention

[0003] The purpose of this invention is to provide a bogie and rail vehicle with a four-rail return device, which can achieve high speed and large passenger capacity, while solving the problem of stray current return.

[0004] To achieve the above objectives, the present invention provides a bogie with a four-rail return device, comprising a crossbeam and side beams at both ends of the crossbeam. Motor hangers and gearbox hangers are provided on both sides of the crossbeam. The side beams include upper and lower cover plates spaced apart, with inner and outer vertical plates and reinforcing ribs connecting the upper and lower cover plates. The upper and lower cover plates extend toward the crossbeam and form a box structure with the vertical plates. Brake hanger forgings are provided on the two opposite sides of the box structure and the inner side of the side beams to form brake hangers. A flat surface is provided in the middle of the lower cover plate, on which welding is performed. There is an installation block equipped with a four-rail return device located within the vehicle outline limit. The four-rail return device includes a flat housing and a return slider for slidingly connecting the four rails. The return slider is connected to a return cable, which transmits stray current to the return slider and then to the four rails. The housing contains a control circuit and a pneumatic drive assembly, which is connected to the return slider. The control circuit sends a control signal to the pneumatic drive assembly, causing the pneumatic drive assembly to drive the return slider to disengage from and contact the four rails.

[0005] Preferably, the mounting block is two forgings spaced apart, the forgings are long strips, and the two sides of the shell are fixedly connected to the mounting holes.

[0006] Preferably, the mounting block is provided with mounting holes, and the two sides of the housing are provided with fastening openings. The fastening openings and mounting holes are coaxial, and the fasteners pass through the fastening openings and mounting holes to fix the housing and the two mounting blocks.

[0007] Preferably, the side of the housing facing the crossbeam is provided with a control circuit interface and an air circuit interface. The control circuit interface is connected to the control circuit, and the air circuit interface is connected to the pneumatic drive assembly.

[0008] Preferably, the return slider includes a carbon slide plate and a lifting bracket. The carbon slide plate is used to slide in contact with the four rails. One end of the lifting bracket is connected to the carbon slide plate, and the other end is connected to a pneumatic drive assembly. The pneumatic drive assembly drives the lifting bracket to rise and fall, so that the carbon slide plate disengages from and contacts the four rails.

[0009] Preferably, one end of the return cable extends along the length of the four rails to a position close to the housing.

[0010] Preferably, it also includes a disc brake system, a suspension system, and a drive system. The disc brake system includes a brake hanger, a brake disc, and a brake caliper. The brake hanger is located on the inner side of the side beam. The brake caliper is mounted on the brake hanger. The brake disc is used to mount the wheel. The brake caliper is positioned in the middle of the brake disc and has dynamic movement space.

[0011] Preferably, the suspension system includes a primary suspension system and a secondary suspension system. The primary suspension system includes a steel spring, a rubber pad, and a primary vertical shock absorber. The secondary suspension system includes an air spring, a secondary vertical shock absorber, and an anti-roll torsion bar. The secondary vertical shock absorber is located on the side adjacent to the four-rail return device, and the anti-roll torsion bar is located above the middle position of the side beam to avoid the four-rail return device.

[0012] Preferably, the side beam is also provided with a spring positioning seat and a swing arm positioning seat. The spring positioning seat is located between the upper cover plate and the lower cover plate and below the four-rail return device. The swing arm positioning seat is located on the surface of the lower cover plate and on both sides of the four-rail return device.

[0013] The present invention also provides a rail vehicle including the bogie described above.

[0014] Compared with the above-mentioned background technology, the bogie with a four-rail return device provided by the present invention has the following beneficial effects:

[0015] 1. The box structure formed by the upper cover plate, lower cover plate and vertical plate effectively improves the torsional and bending resistance. The brake hanger forging can be directly welded to the two opposite sides of the box structure and the inner side of the side beam, realizing a stable structure and reliable connection. It is helpful to adopt a wheel disc braking system and suspension system structure to meet the requirements of strength and dynamic performance.

[0016] 2. A flat surface is provided in the middle of the lower cover plate, and an mounting block is welded on the flat surface. The mounting block is equipped with a four-rail return device. The four-rail return device is located within the vehicle outline limit. It can be seen that, based on the existence of the four-rail return device, the side beam structure of the bogie has been redesigned and improved. While raising the height of the lower cover plate, the inner and outer vertical plates and reinforcing ribs between the upper and lower cover plates have been adjusted to varying degrees to ensure that the bogie meets the limit range of A1 in the industry standard "CJJ / T 96".

[0017] 3. The four-rail return current device includes a flat housing and a return current slider. The return current slider is connected to a return current cable, which transmits stray current to the return current slider, and then to the four rails. The housing houses a control circuit and a pneumatic drive assembly, which is connected to the return current slider. The control circuit sends control signals to the pneumatic drive assembly, causing it to drive the return current slider to disengage from and engage with the four rails. Therefore, the flat four-rail return current device is easy to install and disassemble, facilitates the concentrated return of stray current to the fourth rail, and overcomes the drawbacks of not having a four-rail return current device, such as damage, while also enabling high speed and large passenger capacity. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 A top view of a bogie with a four-rail return device and four rails provided in an embodiment of the present invention;

[0020] Figure 2 for Figure 1 Side view;

[0021] Figure 3 for Figure 1 A bottom view;

[0022] Figure 4 for Figure 1 Structural diagram of the four-rail reflux device;

[0023] Figure 5 for Figure 3 A partial schematic diagram of the steering architecture;

[0024] Figure 6 for Figure 5 Structural diagram of the mounting block;

[0025] Figure 7 This is a partial schematic diagram of the brake hanger of the bogie provided in an embodiment of the present invention;

[0026] in:

[0027] Four tracks 100

[0028] Side beam 1, upper cover plate 11, lower cover plate 12, inner and outer vertical plates 13, reinforcing rib plate 14, vertical plate 15, brake hanger forging 16, plane 17, air spring positioning seat 18, swing arm positioning seat 19.

[0029] Mounting block 2, mounting hole 21

[0030] 3. Four-rail reflux device; 31. Housing; 32. Reflux slider; 321. Carbon slide plate; 322. Lifting bracket; 33. Reflux cable; 34. Control circuit interface; 35. Air circuit interface; 36. Fastening port.

[0031] Wheel disc braking system 4, brake hanger 41,

[0032] Suspension system 5.

[0033] Drive system 6. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] This invention provides a bogie with a four-rail return device, as shown in the attached figure. Figure 1 To be continued Figure 7 As shown, the bogie includes a crossbeam and two side beams 1. The two side beams 1 are located at both ends of the crossbeam and have an H-shaped structure. The crossbeam and the two side beams 1 form the main structure of the bogie frame. The overall thickness is about 243mm. Motor hangers and gearbox hangers are provided on both sides of the crossbeam.

[0037] The side beam 1 includes an upper cover plate 11 and a lower cover plate 12 spaced apart, with a certain gap between them. Inner and outer vertical plates 13 and reinforcing ribs 14 connect the upper cover plate 11 and the lower cover plate 12, forming the basic structure of the side beam 1. The upper cover plate 11, lower cover plate 12, inner and outer vertical plates 13, and reinforcing ribs 14 can be appropriately thickened to improve structural strength. The overall height of the inner and outer vertical plates 13 is approximately 243 mm. To increase strength, the overall thickness of the upper cover plate 11 and lower cover plate 12 is 20 mm, the radius of curvature of the lower cover plate 12 is 230 mm, and the overall height of the reinforcing ribs 14 is 195 mm.

[0038] The upper cover plate 11 and the lower cover plate 12 extend toward the crossbeam, that is, the upper cover plate 11 and the lower cover plate 12 extend toward the inner side of the bogie as a whole. The extended parts of the upper cover plate 11 and the lower cover plate 12 and the multiple vertical plates 15 form a box structure. Brake hanger forgings 16 are provided on the two opposite sides of the box structure and the inner side of the side beam 1 to form a brake hanger 41. The brake hanger forgings 16 can be directly welded to the two opposite sides of the box structure and the inner side of the side beam 1 for installing the four mounting holes of the brake caliper.

[0039] The lower cover plate 12 has a plane 17 in the middle, and a mounting block 2 is welded on the plane 17. The mounting block 2 is equipped with a four-rail return device 3. The four-rail return device 3 is located within the vehicle outline limit. It can be seen that, based on the existing bogie, the height of the lower cover plate 12 is raised, and the dimensions of the inner and outer vertical plates 13 and the reinforcing rib plate 14 are adjusted accordingly.

[0040] The four-rail reflux device 3 includes a flat housing 31 and a reflux slider 32 for slidingly connecting the four rails 100. The reflux slider 32 is connected to a reflux cable 33, which transmits stray current to the reflux slider 32 and then to the four rails 100. The housing 31 is equipped with a control circuit and a pneumatic drive assembly. The pneumatic drive assembly is connected to the reflux slider 32. The control circuit sends a control signal to the pneumatic drive assembly, causing the pneumatic drive assembly to drive the reflux slider 32 to disengage from and contact the four rails.

[0041] As can be seen, the return cable 33 transmits the stray current on the vehicle to the return slider 32, and the return slider 32 transmits the stray current on the vehicle to the four rails 100 and maintains a certain pressure. The pneumatic drive assembly is disconnected and started through the air circuit, thereby ensuring that the return slider 32 is in the corresponding position. The control circuit is used to control the disconnection and start of the pneumatic drive assembly. The adjustable spring pressure device adjusts the height of the return slider 32 with a height resolution of 4mm and maintains a certain pressure.

[0042] The thickness of the housing 31 of the four-rail return device 3 can be set between 150-160mm, preferably 155mm. Its thickness is relatively thin. The housing 31 integrates the other components and forms a space interface that can be arranged so that it is located within the vehicle outline limit, making it easy to install and disassemble. It facilitates the centralized return of stray current to the four rails 100, solving the disadvantages such as damage caused by the absence of four-rail return, while achieving high speed level and large passenger capacity.

[0043] Mounting block 2 consists of two spaced-apart forgings, each elongated and equipped with mounting holes 21. Mounting blocks 2 are connected to the two sides of housing 31 via mounting holes 21. Fastening ports 36 may be provided on the two sides of housing 31. During installation, the fastening ports 36 and mounting holes 21 are aligned, and bolts or other fasteners are used to lock the fastening ports 36 and mounting holes 21, thereby ensuring the fixed position of housing 31 and mounting blocks 2. That is, the four-rail return device 3 can be mounted and fastened to the lower plane of side beam 1 with four bolts, positioned in the middle of side beam 1, in contact with the four rails 100, and within the vehicle's outline limits.

[0044] The housing 31 has a control circuit interface 34 and an air circuit interface 35 on the side facing the crossbeam. The control circuit interface 34 is connected to the control circuit, and the air circuit interface 35 is connected to the pneumatic drive assembly.

[0045] The return circuit is connected to the upper part of the vehicle body via a circuit cable on the outside of the side beam 1. One end of the air passage is connected to the air source pipe on the vehicle through the middle gap of the crossbeam, and the other end of the air passage is connected to the housing 31 through the air passage interface 35. The control circuit controls the opening and closing of the solenoid valve and is connected to the vehicle body via a cable on the outside of the side beam 1. The control circuit is also connected to the housing 31 through the control circuit interface 34.

[0046] The return slider 32 includes a carbon slide plate 321 and a lifting bracket 322. The carbon slide plate 321 is used to slide in contact with the four rails. One end of the lifting bracket 322 is connected to the carbon slide plate 321, and the other end is connected to the pneumatic drive assembly. The pneumatic drive assembly drives the lifting bracket 322 to rise and fall, so that the carbon slide plate 321 disengages from and contacts the four rails 100.

[0047] One end of the return cable 33 and the return slider 32 is connected and extends along the length of the four rails 100 and extends to a position close to the housing 31. This avoids messy routing of the return cable 33 and makes the routing neat. At the same time, it is located within the vehicle outline limit and meets the corresponding requirements.

[0048] Under normal operating conditions, stray currents and short-circuit currents from the vehicle are transmitted through the return cable 33, and then through the return slider 32 in dynamic contact with the four rails 100, returning to the substation and completing the return function of stray and short-circuit currents from the vehicle. Under the control command of the control circuit, the air circuit in the pneumatic drive assembly is always in the closed state. At the same time, due to the spring force, the return slider 32 is statically or dynamically pressed against the four rails 100 with a constant contact force. When it is necessary to cut off the return state, the control circuit issues a command to switch the air circuit. The pneumatic cylinder in the pneumatic drive assembly forces the return slider 32 to move downward, completing the cut-off process.

[0049] When designing a bogie, it is necessary to analyze the structural dimensional parameters of the bogie, the structural dimensional parameters of the four-rail return device 3, the structural dimensional parameters of the rails and four-rail 100, the A1 vehicle clearance, and equipment clearance factors. Six scenarios of dynamic contact limit matching are considered to prevent the inability to return or collision in extreme cases. The following six scenarios are listed below:

[0050] The first scenario: When the four-rail return device 3 is in operation, when the bogie and its four-rail return device 3 cause the contact surface to deviate vertically downward to the maximum (including the carbon slide plate 321 being worn to the limit), and when the contact surface of the four rails 100 deviates vertically upward to the maximum due to various factors, the carbon slide plate 321 of the four-rail return device 3 will not disengage from the four rails 100.

[0051] When the following conditions are met: the free position height of the carbon slide plate 321 of the four-rail return device 3 minus the maximum vertical downward deviation of the four-rail return device 3 minus the maximum vertical upward deviation of the rail surface of the four-rail 100 minus the maximum wear of the carbon slide plate 321 is greater than or equal to the height of the four-rail 100 (i.e., the normal working position height of the carbon slide plate 321), the carbon slide plate 321 will not detach from the four-rail 100.

[0052] The second scenario: When the four-rail return device 3 is in a free state, the bogie and its four-rail return device 3 cause the maximum vertical deviation of the contact surface (considering the wear of the carbon slide plate 321), and the contact surface of the four rails 100 causes the maximum vertical deviation of the contact surface due to various factors, the carbon slide plate 321 of the four-rail return device 3 will not interfere with or collide with the rail head of the end bend of the four rails 100.

[0053] When the following conditions are met: the carbon slide plate 321 of the four-rail reflux device 3 plus the maximum vertical deviation of the four-rail reflux device 3 (without wear of the carbon slide plate 321) is less than or equal to the normal working height of the carbon slide plate 321 plus the maximum vertical deviation of the contact surface of the four rails 100, the carbon slide plate 321 of the four-rail reflux device 3 will not interfere with or collide with the head of the end bend of the four rails 100.

[0054] The third scenario: When the four-rail return device 3 is in the cut-off isolation state, when the bogie and its four-rail return device 3 cause the contact surface to deviate vertically upwards to the maximum (considering the wear of the carbon slide plate 321), when the contact surface of the four rails 100 deviates vertically downwards to the maximum due to various factors, the carbon slide plate 321 of the four-rail return device 3 does not contact the trackside equipment and leaves sufficient electrical clearance safety margin.

[0055] When the following conditions are met: the isolation height of the carbon slide plate 321 of the four-rail reflux device 3 plus the maximum vertical deviation of the four-rail reflux device 3 (without wear of the carbon slide plate 321) plus the electrical clearance safety margin is less than or equal to the normal working height of the carbon slide plate 321 (without wear of the carbon slide plate 321) minus the maximum vertical deviation of the contact surface of the four rails 100, the carbon slide plate 321 of the four-rail reflux device 3 will not interfere with or collide with the four rails 100.

[0056] The fourth scenario: When the four-rail return device 3 is in the cut-off isolation state, and the bogie and its four-rail return device 3 cause the maximum vertical downward deviation, the four-rail return device 3 and the carbon slide plate 321 will not interfere with or collide with the trackside equipment.

[0057] When the following conditions are met: the minimum point of the carbon slide plate 321 of the four-rail return device 3 minus the maximum vertical deviation of the four-rail return device 3 is greater than or equal to the maximum height of the trackside equipment, the four-rail return device 3 and the carbon slide plate 321 will not interfere with or collide with the trackside equipment.

[0058] Fifth scenario: When the four-rail reflux device 3 is in operation, when the four-rail reflux device 3 deviates to its maximum inward direction and the four rails 100 deviate to their maximum outward direction, the four-rail reflux device 3 does not disengage from the four rails 100.

[0059] When the following conditions are met: the maximum inward deviation of the four-rail return device 3 plus the maximum inward deviation of the rail plus the maximum outward deviation of the four-rail 100 is less than or equal to the larger value (the width of the carbon slide plate 321 or half the width of the slider of the four-rail 100).

[0060] The sixth scenario: When the four-rail reflux device 3 is in operation, when the four-rail reflux device 3 deviates to the maximum outward and the four rails 100 deviate to the maximum inward, the four-rail reflux device 3 does not disengage from the four rails 100.

[0061] When the following conditions are met: the maximum outward deviation of the four-rail return device 3 plus the maximum outward deviation of the rail plus the maximum inward deviation of the four-rail 100 is less than or equal to the larger value (the width of the carbon slide plate 321 or half the width of the slider of the four-rail 100).

[0062] The above six cases are independent of each other and are used when designing the bogie. They can also be considered as a method for testing the compatibility between the bogie with a four-rail return device and the four-rail system.

[0063] The bogie also includes a disc braking system 4, a suspension system 5, and a drive system 6. The disc braking system 4 includes a brake hanger 41, a brake disc, and a brake caliper. The brake hanger is located on the inner side of the side beam 1. The brake hanger is used to install the brake caliper. The brake disc is used to install on the wheel. The brake caliper is located in the middle of the brake disc and has dynamic movement space.

[0064] The suspension system includes a primary suspension system and a secondary suspension system. The primary suspension system includes steel springs, rubber pads, and primary vertical shock absorbers. The secondary suspension system includes air springs, secondary vertical shock absorbers, and anti-roll torsion bars. The secondary vertical shock absorbers are located on one side adjacent to the four-rail return device 3, and the anti-roll torsion bars are located above the middle position of the side beam 1 to avoid the four-rail return device 3.

[0065] The primary suspension system adopts a swing arm positioning method and includes steel springs, rubber pads, and primary vertical shock absorbers. The secondary suspension system includes air springs, secondary vertical shock absorbers, and anti-roll torsion bars. Due to structural changes in the bogie body and side beam 1, the interface with the air springs changes in height, the height of the air springs decreases, the position of the secondary vertical shock absorbers moves to one side of the four-rail return device 3, and the anti-roll torsion bar device is arranged in the middle of the bogie and is no longer arranged below the side beam of the main frame.

[0066] The side beam 1 is also provided with a spring positioning seat 18 and a swing arm positioning seat 19. The spring positioning seat 18 is located between the upper cover plate 11 and the lower cover plate 12 and below the four-rail return device 3. The swing arm positioning seat 19 is located on the surface of the lower cover plate 12 and on both sides of the four-rail return device 3.

[0067] The drive system includes a traction motor, coupling, gearbox, axle, and wheels. The motor mount and gearbox mount consist of two connecting mounts and two stiffening plates, increasing the gearbox's transmission ratio. It adopts a structure with a wheel disc braking system and a suspension system. The frame plate thickness is increased to meet the requirements of 100km / h speed, axle load of 17 tons, strength requirements, and dynamic performance.

[0068] The present invention also provides a rail vehicle, including a bogie as described above. Other components of the rail vehicle can be found in the prior art and will not be elaborated here.

[0069] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0070] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A bogie with a four-rail return system, comprising a crossbeam and side beams disposed at both ends of the crossbeam, characterized in that, The crossbeam has motor hangers and gearbox hangers on both sides. The side beam includes an upper cover plate and a lower cover plate spaced apart. Inner and outer vertical plates and reinforcing ribs connect the upper and lower cover plates. The upper and lower cover plates extend toward the crossbeam and form a box structure with the vertical plates. Brake hanger forgings are provided on the two opposite sides of the box structure and the inner side of the side beam to form a brake hanger. A flat surface is provided in the middle of the lower cover plate. A mounting block is welded on the flat surface. The mounting block is equipped with a four-rail return device. The four-rail return device is located at... Within the vehicle outline limit, the four-rail return device includes a flat housing and a return slider for slidingly connecting the four rails. The return slider is connected to a return cable, which transmits stray current to the return slider and then to the four rails. The housing contains a control circuit and a pneumatic drive assembly, which is connected to the return slider. The control circuit sends a control signal to the pneumatic drive assembly, causing the pneumatic drive assembly to drive the return slider to disengage from and contact the four rails. The return slider includes a carbon slide plate and a lifting bracket. The carbon slide plate is used to slide in contact with the four rails. One end of the lifting bracket is connected to the carbon slide plate, and the other end is connected to the pneumatic drive assembly. The pneumatic drive assembly drives the lifting bracket to rise and fall, so that the carbon slide plate disengages from and contacts the four rails. When the four-rail reflux device is in operation, the contact surface of the four-rail reflux device deviates vertically downward to the maximum, and the contact surface of the four rails deviates vertically upward to the maximum. When this occurs, the carbon slide plate of the four-rail reflux device does not detach from the four rails. The free position height of the carbon slide plate minus the maximum downward vertical deviation of the four-rail reflux device minus the maximum upward vertical deviation of the four rails minus the maximum wear of the carbon slide plate is greater than or equal to the height of the four rails. When the four-rail return device is in a free state, the contact surface of the four-rail return device deviates vertically upward to the maximum, and the contact surface of the four rails deviates vertically downward to the maximum. The carbon slide plate of the four-rail return device does not interfere with or collide with the rail head of the end bend of the four rails. The maximum vertical deviation of the carbon slide plate plus the maximum vertical deviation of the four-rail return device is less than or equal to the normal working height of the carbon slide plate plus the maximum vertical deviation of the contact surface of the four rails. When the four-rail return device is in the cut-off isolation state, the contact surface of the four-rail return device has the maximum vertical upward deviation, and the contact surface of the four rails has the maximum vertical downward deviation. The carbon slide plate does not contact the railside equipment and leaves an electrical clearance safety margin. When the four-rail reflux device is in operation, the four-rail reflux device will not disengage from the four rails when the four rails deviate to their maximum inward deviation and the four rails deviate to their maximum outward deviation. When the four-rail reflux device is in operation, the four-rail reflux device will not disengage from the four rails when the four rails deviate to the maximum outward and inward.

2. The bogie with a four-rail return device according to claim 1, characterized in that, The mounting block consists of two spaced-apart forgings, each forging being elongated. The two sides of the housing are fixedly connected to the mounting holes of the mounting block.

3. The bogie with a four-rail return device according to claim 2, characterized in that, The housing has fastening openings on both sides, and the fastening openings and mounting holes are coaxial. Fasteners pass through the fastening openings and mounting holes to fix the housing and the two mounting blocks.

4. The bogie with a four-rail return device according to claim 1, characterized in that, The housing has a control circuit interface and an air circuit interface on the side facing the crossbeam. The control circuit interface is connected to the control circuit, and the air circuit interface is connected to the pneumatic drive assembly.

5. The bogie with a four-rail return device according to claim 1, characterized in that, One end of the return cable extends along the length of the four rails to a position close to the housing.

6. The bogie with a four-rail return device according to claim 5, characterized in that, It also includes a disc brake system, a suspension system, and a drive system. The disc brake system includes the brake mount, a brake disc, and a brake caliper. The brake mount is located on the inner side of the side beam. The brake mount is used to install the brake caliper. The brake disc is used to mount the wheel. The brake caliper is located in the middle of the brake disc and has dynamic movement space.

7. The bogie with a four-rail return device according to claim 6, characterized in that, The suspension system includes a primary suspension system and a secondary suspension system. The primary suspension system includes a steel spring, a rubber pad, and a primary vertical shock absorber. The secondary suspension system includes an air spring, a secondary vertical shock absorber, and an anti-roll torsion bar. The secondary vertical shock absorber is located on one side adjacent to the four-rail return device, and the anti-roll torsion bar is located above the middle position of the side beam to avoid the four-rail return device.

8. The bogie with a four-rail return device according to claim 1, characterized in that, The side beam is also provided with a spring positioning seat and a swing arm positioning seat. The spring positioning seat is located between the upper cover plate and the lower cover plate and below the four-rail return device. The swing arm positioning seat is located on the surface of the lower cover plate and on both sides of the four-rail return device.

9. A rail vehicle, characterized in that, Includes the bogie as described in any one of claims 1-8 above.

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