Rail vehicle and bogie therefor

Abstract

This invention discloses a rail vehicle and its bogie. The bogie of the rail vehicle includes a frame, side beam connecting devices, a traction device, a drive device, a braking device, a primary suspension, and a secondary suspension. The frame is composed of two side beams, which are distributed laterally along the rail vehicle. The side beam connecting devices consist of two axle bridges, distributed longitudinally along the track. The two side beams and the two axle bridges are connected by a primary suspension, forming a "well"-shaped structure. One end of the traction device is connected to the axle in the middle of the axle bridge, and the other end is connected to a traction seat connected to the car body underframe. The drive device is installed on the outer side of the side beams. The secondary suspension is installed in the recessed area of ​​the side beams. The rail vehicle bogie provided in this application breaks through the traditional bogie structure, forming a crossbeam-less and end beam-less bogie, which simplifies the structure, reduces weight, and lowers manufacturing costs.

Description

Technical Field

[0001] This invention relates to the field of rail transit technology, and in particular to a rail vehicle and its bogie. Background Technology

[0002] Traditional light rail vehicles use bogies with independently rotating wheels, such as Figures 1 to 3 As shown, its basic components typically consist of an integral frame structure with end beams 01, side beams 03, and crossbeams 02 welded together; wheelsets with independently rotating wheels; a drive unit 07; primary suspension 04; secondary suspension 012; a traction device; and a braking device 08 (including a magnetic track brake). While the component composition is not significantly different from commonly used bogies, its structural form differs greatly. Specifically, the wheelset with independently rotating wheels includes wheels 09 and axle axles 010, such as... Figure 2 As shown, the dashed line represents the center line of the wheel, while the dotted line represents the center line of the axle body. They are not at the same height. The center line of the axle body of axle axle axle 010 is lower than the center line of the wheel 09. The axle axle axle has a U-shaped structure, and the concave part in the middle is called the axle body.

[0003] In this bogie, two side beams 03 are connected by a crossbeam 02. The wheelset of the independently rotating wheels is connected to the two side beams 03 via a primary suspension 04. The traction device is mounted on the crossbeam 02, and the drive device is mounted on the cantilever support 013 on the outer side of the side beams 03. However, this bogie structure with multiple functional components results in a complex bogie structure and high manufacturing costs.

[0004] Therefore, how to simplify the design of bogies, reduce weight, and lower manufacturing costs are technical problems that urgently need to be solved by those skilled in the art. Summary of the Invention

[0005] The object of this invention is to provide a bogie for a rail vehicle that has a simplified design, reduced weight, and lower manufacturing cost. Another object of this invention is to provide a rail vehicle comprising the aforementioned bogie.

[0006] This application provides a bogie for a rail vehicle, comprising:

[0007] The frame consists of two side beams, which are distributed laterally along the rail vehicle, and the lateral direction of the rail vehicle is perpendicular to the direction of the rail vehicle's movement.

[0008] One-line suspension;

[0009] The side beam connecting device consists of two axle bridges, which are distributed along the longitudinal direction of the rail vehicle. The two side beams and the two axle bridges are connected by the primary suspension to form a "well" shaped structure. The longitudinal direction of the rail vehicle is the forward direction of the rail vehicle.

[0010] The traction device has one end connected to the axle in the middle of the axle bridge and the other end connected to the traction seat connected to the chassis of the vehicle body.

[0011] Optionally, in the bogie of the above-mentioned rail vehicle, the inner side of the side beam is provided with a chamfer that extends outward at the end position, and the inner side of the side beam is the side surface of the two side beams facing each other.

[0012] Optionally, the bogie of the above-mentioned rail vehicle also includes a drive unit and a disc brake device. The drive unit and the disc brake device are integrated and installed on the outside of the side beam. The outside of the side beam is the side of the two side beams facing away from each other.

[0013] Optionally, in the bogie of the aforementioned rail vehicle, the two primary suspension springs are installed at laterally offset positions by a first preset distance, where the lateral position is the direction of the centrifugal force of the rail vehicle.

[0014] Optionally, the bogie of the above-mentioned rail vehicle also includes a secondary suspension, wherein the side beam has a recessed area that is high at both ends and low in the middle, the secondary suspension is installed in the recessed area, and the support surface of the secondary suspension is lower than the second preset distance of the roll center of the primary suspension.

[0015] Optionally, in the bogie of the aforementioned rail vehicle, the primary suspension spring is a double conical rubber spring and / or the secondary suspension spring is a double hourglass rubber spring.

[0016] Optionally, in the bogie of the above-mentioned rail vehicle, the traction device includes a traction rod, the center of the axle bridge is at the same height as the wheel center of the rail vehicle, and the axle bridge has a traction device interface facing the center of the bogie, and the traction rod is installed on the traction device interface.

[0017] Optionally, in the bogie of the above-mentioned rail vehicle, the traction device further includes a traction seat and a traction connecting seat. The traction connecting seat is installed on the traction seat. There are two traction rods, which are respectively installed at both ends of the traction connecting seat, and the two traction rods and the traction connecting seat are arranged in a Z-shape.

[0018] Optionally, the bogie of the aforementioned rail vehicle further includes:

[0019] End process beams, comprising two beams, are detachably connected to opposite ends of the side beams when the axle bridge needs to be removed. The ends of the two side beams are connected via the process beams, and the two end process beams are symmetrically arranged at the ends of the side beams; and / or

[0020] A lateral stop module and a sway stop module, wherein the lateral stop module is disposed in the middle of the side beam and the sway stop module is disposed at the end of the side beam; and / or

[0021] A magnetic track brake and a drive unit, wherein the magnetic track brake is mounted below the side beam, the magnetic track brake is suspended on the axle bridge, and is located at the bottom end of the drive unit.

[0022] A rail vehicle includes a bogie, said bogie being any of the bogies described above.

[0023] In the above technical solution, the bogie of the rail vehicle provided by the present invention includes a frame, a primary suspension, a side beam connecting device, and a traction device. The frame consists of two side beams distributed laterally along the rail vehicle, which is perpendicular to the direction of travel of the rail vehicle. The side beam connecting device consists of two axle bridges distributed longitudinally along the rail vehicle. The two side beams and the two axle bridges are connected by a primary suspension, forming a "well"-shaped structure, with the longitudinal direction of travel of the rail vehicle being the direction of travel. One end of the traction device is connected to the axle in the middle of the axle bridge, and the other end is connected to a traction seat connected to the car body underframe.

[0024] As can be seen from the above description, in the bogie of the rail vehicle provided in this application, the traction device and the primary suspension are both installed on the axle bridge, which eliminates the need for the crossbeam structure, simplifies the structure, and reduces the amount of manufacturing materials, thus lowering the manufacturing cost of the bogie. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a schematic diagram of a traditional low-floor bogie.

[0027] Figure 2 A three-dimensional structural diagram of the independently rotating wheelset of a traditional low-floor bogie;

[0028] Figure 3This diagram shows the installation positions of the end beams, crossbeams, and cantilever supports of a traditional low-floor bogie frame.

[0029] Figure 4 This is a schematic diagram of the basic principle structure of the bogie provided in an embodiment of the present invention;

[0030] Figure 5 for Figure 4 The diagram shown is a structural schematic of the bogie in the W direction.

[0031] Figure 6 This is a front view of the bogie provided in an embodiment of the present invention;

[0032] Figure 7 This is a top view of the bogie provided in an embodiment of the present invention;

[0033] Figure 8 This is a left view of the bogie provided in an embodiment of the present invention;

[0034] Figure 9 for Figure 7 The diagram shown is a structural schematic of the bogie along the FF direction.

[0035] Figure 10 for Figure 7 The diagram shows the structure of the bogie along the GG direction.

[0036] Figure 11 This is a front view of the axle bridge and wheel assembly provided in an embodiment of the present invention;

[0037] Figure 12 This is a top view of the axle bridge and wheels assembled according to an embodiment of the present invention;

[0038] Figure 13 This is a side view of the axle bridge and wheels assembled according to an embodiment of the present invention;

[0039] Figure 14 This is a diagram showing the installation position of the end process beam provided in an embodiment of the present invention;

[0040] Figure 15 This is a schematic diagram illustrating the principle of preventing the side beam of the bogie from tipping over, as provided in an embodiment of the present invention.

[0041] in, Figure 1-3 Middle: End beam 01, cross beam 02, side beam 03, primary suspension 04, first gearbox 05, hollow shaft 06, drive unit 07, braking device 08, wheel 09, axle bridge 010, vertical damper 011, secondary suspension 012, suspension support 013;

[0042] Figure 4-15In the middle: 1. Body floor; 2. Side beam; 3. Primary suspension; 4. Coupling; 5. Gearbox; 6. Motor suspension mount; 7. Motor; 8. Secondary suspension; 9. Lateral stop module; 10. Traction device; 10. Left traction link; 101. Traction connecting seat; 102. Traction seat; 103. Right traction link; 104. Vertical damper; 11. Wheel; 12. Swing stop module; 13. Lateral damper; 14. Axle bridge; 15. Magnetic rail brake; 16. Disc brake device; 17. Traction device interface; 18. End process beam; 19. Chamfer; 20. Wheel bearing; 21. First gearbox; 22. Second gearbox; 23. Large gear; 24. Hollow shaft; 25. First coupling; 26. Second coupling; 27. Small gear shaft; 28. Motor shaft; 29. Detailed Implementation

[0043] The core of this invention is to provide a bogie for a rail vehicle that reduces manufacturing costs. Another core aspect of this invention is to provide a rail vehicle comprising the aforementioned bogie.

[0044] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0045] Please refer to Figures 1 to 15 .

[0046] In one specific embodiment, the bogie of the rail vehicle provided by this invention includes a frame, independently rotating wheels 12, a traction device 10, a primary suspension 3, a vertical damper 11, a lateral damper 14, and a side beam connecting device. The frame is composed of two side beams 2, which are distributed along the lateral direction of the rail vehicle, which is perpendicular to the direction of travel of the rail vehicle; that is, the side beams 2 are arranged perpendicular to the direction of travel of the rail vehicle.

[0047] The side beam connecting device consists of two axle bridges 15, which are distributed along the longitudinal direction of the rail vehicle. The two side beams 2 and the two axle bridges 15 are connected by a primary suspension 3 to form a "well" shaped structure. The longitudinal direction of the rail vehicle is the direction of its forward movement.

[0048] One end of the primary suspension 3 is mounted on the side beam 2, and the other end of the traction device 10 and the primary suspension 3 is mounted on the axle axle 15. Specifically, one end of the traction device 10 is connected to the axle body in the middle of the axle axle 15, and the other end is connected to the traction seat 103 connected to the vehicle body underframe.

[0049] During actual processing and assembly, the axle bridge 15 replaces the function of the crossbeam. A traction device interface 18 for mounting the traction device 10 is located at the transverse midpoint of the axle bridge 15. The axle bridge 15 also has an interface for mounting the primary suspension 3, corresponding to the primary suspension interface of the side beam 2, but offset laterally by a distance to provide stability support for the side beam 2. During assembly, the axle bridge body of the axle bridge 15 replaces the function of the crossbeam. After assembly, the entire bogie has no crossbeam, and the side beam 2 is essentially in a straight line.

[0050] As can be seen from the above description, in the bogie of the rail vehicle provided in the specific embodiment of this application, the other end of the traction device 10 and the primary suspension 3 are both installed on the axle bridge 15. The design of the crossbeam-less structure is adopted, which eliminates the crossbeam structure, simplifies the structure, and reduces the amount of manufacturing materials, thereby reducing the weight of the frame and lowering the manufacturing cost of the bogie.

[0051] In one specific embodiment, to provide a large passage for the vehicle body floor 1, the inner side of the side beam 2 is provided with an outwardly flared chamfer 20 at the end position. The inner side of the side beam 2 is the side surface of the two side beams 2 facing each other. By setting the chamfer 20, a large turning angle is provided for the vehicle body floor 1 embedded between the two side beams 2 of the bogie, so that the vehicle will not interfere when passing through a curve with a small radius. In a specific implementation, the inner sides of the ends of the two side beams 2 are flared outwards in a figure-eight shape.

[0052] Specifically, such as Figure 7 As shown, the outward-expanding bevel tilts outward at an angle β to form a chamfer of 20°. From Figure 7 The two side beams are arranged in a “﹞﹝” shape, which increases the allowable rotation angle between the main body of the rail vehicle and the bogie when the vehicle is running on a curve, making it easier for the rail vehicle to pass through small curves.

[0053] In one specific embodiment, the bogie of the rail vehicle further includes a drive unit and a disc brake 17. The drive unit and disc brake 17 are integrated and installed on the outer side of the side beam 2, which is the side where the two side beams 2 face away from each other. Specifically, the drive unit includes a motor 7 and a gearbox 5. This application reduces two crossbeams, two end beams, and two cantilever supports, simplifying the structure, reducing the frame weight by approximately 30%, and lowering manufacturing costs.

[0054] During assembly, the drive unit and disc brake 17 are integrated and mounted on the outside of the side beam 2 from the side via the motor suspension seat 6. The driving torque is transmitted to the wheel 12 through the coupling 4, and the disc brake 17 is mounted on one end of the motor 7.

[0055] Considering that the frame is connected by only two side beams 2 and two axle bridges 15 via a primary suspension 3, and the drive unit is suspended on one side of the side beam 2, the side beam 2 has poor stability. To prevent the side beam 2 from overturning, preferably, the two primary springs of the primary suspension 3 are installed laterally offset by a first preset distance, with the lateral direction being the direction of the centrifugal force of the rail vehicle. Specifically, as shown... Figure 7 As shown, the two primary springs of the primary suspension 3 are offset laterally by a distance A, providing the side beam 2 with anti-yaw moment. In this application, the two primary springs of each primary suspension 3 are offset laterally by a distance, providing the side beam 2 with anti-yaw moment. From Figure 12 As can be seen from the present invention, the mounting holes of the two primary springs are offset by a first preset distance A in the lateral direction.

[0056] In one specific embodiment, the bogie of the rail vehicle further includes a secondary suspension 8. The side beam 2, in the vertical force direction, has a recessed area that is high at both ends and low in the middle, and the secondary suspension 8 is installed in this recessed area. Specifically, the side beam 2 is high at both ends and low in the middle along the longitudinal direction. The support surface of the secondary suspension 8 is lower than the swing center of the primary suspension 3 by a second preset distance. The swing center refers to the point where the vehicle rotates around the lateral direction (vehicle running direction), theoretically rotating around a point in space. Specifically, the mounting surface of the secondary suspension 8 in the middle of the side beam 2 is lower than the swing center of the primary suspension 3 by a second preset distance B. The mounting surface of the secondary suspension 8 is used to install the secondary suspension and provide the side beam 2 with anti-overturning torque. In this application, the side beam 2 is designed with a structure that is high at both ends and low in the middle in the vertical direction, so that the support surface of the secondary suspension 8 on the side beam 2 is lower than the swing center of the primary suspension 3. Figure 10 and Figure 15 As shown, the height difference B between the secondary suspension 8 support surface and the primary suspension 3 support surface is set primarily to ensure a stable equilibrium state for the object when the center of gravity is below the fulcrum. The second preset distance is preferably greater than 10mm. Specific values ​​can be determined based on actual conditions. After bearing the load of the rail vehicle, the side beam 2 effectively "suspends" the weight borne by the secondary suspension 8 onto the primary suspension 3. This allows the side beam 2 to swing left and right around the primary suspension 3, forming a self-stabilizing pendulum structure, thereby preventing the side beam 2 from overturning and lowering the overall center of gravity of the vehicle, which is beneficial for the vehicle's stable operation.

[0057] During assembly, the mounting brackets for the primary suspension 3 on the axle bridge 15 were arranged accordingly, from... Figure 2 It can be seen that the line connecting the two primary spring mounting holes is parallel to the horizontal direction, while from... Figure 12 As can be seen from the diagram, the two primary spring mounting holes in this invention are offset by a first preset distance A in the lateral direction. The line connecting the support points changes from coinciding with the center line of the side beam to intersecting it, which can be understood as changing line support to surface support, thus preventing the frame from rolling laterally. Figure 11 and Figure 12 As shown, this design causes the side beam 2 to swing left and right around two points of the primary suspension 3. That is, in the transverse plane, the load point of the secondary suspension 8 and the two primary spring roll points form a triangular structure, as shown in the diagram. Figure 15 As shown, due to the stability of the triangle, the left and right swaying of the side beam 2 is suppressed.

[0058] The primary suspension 3 uses double-cone rubber springs and / or the secondary suspension 8 uses double-hourglass rubber springs. The primary suspension 3 uses a double-cone rubber spring structure to achieve the anti-rollover performance of the side beam 2.

[0059] The secondary suspension 8 uses double hourglass-shaped rubber springs. A double hourglass-shaped rubber spring is used on a single side beam 2. The spring's installation position is lower than the swing center of the primary suspension 3, located in the concave area in the middle of the side beam 2. This significantly reduces the height of the vehicle's center of gravity and improves the stress distribution on the beam.

[0060] The vehicle's primary suspension 3 is installed between the side beam 2 and the axle 15, while the secondary suspension 8 is installed in the recessed area in the middle of the side beam 2. Vertical dampers 11 are installed on the upper surface of the side beam 2 at positions corresponding to the primary suspension 3, and lateral dampers 14 are installed at the ends of the side beam 2 facing outwards. This arrangement ensures that the suspension components do not occupy the space inside the two side beams 2, facilitating the achievement of a low-floor vehicle. The traction device 10 is positioned laterally between the two side beams 2, but vertically below the vehicle floor 1. This allows the traction device 10 to evenly transmit traction without affecting the achievement of the low-floor vehicle goal.

[0061] Considering that the axle bridge 15, on which the independently rotating wheel 12 is mounted, needs to function as a frame beam, in order to prevent the traction force and braking force from causing inconsistent longitudinal loads on the primary suspension 3 on the left and right sides of the axle bridge 15, the traction device 10 includes a traction rod, such as... Figure 11 and Figure 12 As shown, the center of the axle bridge 15 is at the same height as the center of the wheel 12 of the rail vehicle, and a traction device interface 18 is provided in the middle of the axle bridge 15 facing the center of the bogie. The traction rod is installed in the traction device interface 18. That is, the center of the axle bridge 15 is at the same height as the center of the wheel 12. The traction device 10 is set at the center of the wheel bearing 21 of the wheel 12. That is, the interface between the axle bridge 15 and the traction rod of the traction device 10 must be at the center of the axle. Its traction force will not cause the axle bridge 15 to rotate around the wheel bearing 21, while ensuring that the longitudinal load on the primary suspension 3 is consistent. Figure 11 and Figure 12As shown, the vertical height of the axle bridge 15 is consistent with the center of the wheel 12, and the lateral position is located on the center line of the bogie. In this way, the axle bridge 15 will not rotate around the wheel bearing 21 under the action of traction and braking force, and there will be no difference in the force on the springs of the left and right primary suspension 3.

[0062] To reduce the stress on the axle axle 15, the traction device 10 also includes a traction seat 103 and a traction connecting seat 102. The traction connecting seat 102 is mounted on the traction seat 103. Two traction rods are provided: a left traction connecting rod 101 and a right traction connecting rod 104. The two traction rods are respectively mounted at both ends of the traction connecting seat 102, and the two traction rods and the traction connecting seat 102 are arranged in a Z-shape. By adopting a Z-shaped traction device arranged in the vertical plane, the axle axle 15 and the traction rods of the traction device are located at the center of the axle, ensuring that the axle does not rotate around the wheel bearing 21 under the action of traction and braking forces, and making the longitudinal force borne between the two primary suspensions 3 on the same axle uniform. This application distributes the force of the traction device 10 to the two axle axles 15. Considering the relative displacement caused by the primary suspension 3 between the two axle axles 15, a Z-shaped traction device is used to accommodate this. However, a horizontally arranged Z-shaped traction device cannot connect all the traction rods to the middle position of the axle. Therefore, the Z-shaped traction device must be arranged in a vertical plane. The Z-shaped traction device accommodates the movement between the two wheelsets, transmits traction and braking forces, and ensures that the force is evenly distributed between the two primary suspension springs on the left and right sides of the same axle.

[0063] The mounting interface for the drive and braking devices has been changed from vertical to lateral installation, i.e., mounted on the outside of the side beam 2. The drive device consists of a motor 7 and two gearboxes 5, namely the first gearbox 22 and the second gearbox 23. The motor 7 has a double-ended output structure. Each end of the motor 7 is connected to a gearbox 5 with a bevel gear. The disc brake 17 is mounted on one end of the motor 7. The entire drive and disc brake 17 are integrated into a single unit, mounted laterally on the side beam 2 via the motor suspension seat 6. This eliminates the need for the cantilever support 013 of the cantilever structure on the side beam 2, resulting in a straight structure in the top view, significantly reducing weight and simplifying the structure. Typically, the drive and braking devices utilize the cantilever structure in the middle of the frame for vertical installation. This invention changes the vertical installation to lateral installation, eliminates the cantilever structure, reduces its weight, and simplifies the frame structure.

[0064] Considering that the entire bogie lacks a complete frame structure, in order to maintain a unified structure when removing the axle axle 15 of the independently rotating wheels 12, the bogie of the rail vehicle provided in this application also includes end process beams 19. There are two end process beams 19, each connected to opposite ends of the side beams 2. The ends of the two side beams 2 are connected by process beams, and the two process beams are symmetrically arranged at the ends of the side beams 2. The bogie frame of this invention is provided with two end process beams 19, ensuring that the entire bogie maintains a unified structure when the axle axle 15 is removed, facilitating routine bogie maintenance. Specifically, after first removing the lateral vibration dampers 14 at both ends of the side beams 2, the two end process beams 19 can be installed using the mounting supports of the lateral vibration dampers 14, thus facilitating routine bogie maintenance. That is, when replacing the axle axle 15, the process beams are installed using the mounting supports of the end vibration dampers, maintaining the integrity of the bogie.

[0065] The bogie of the rail vehicle provided in this application also includes a lateral stop module 9 and a yaw stop module 13. The lateral stop module 9 is located in the middle of the side beam 2, and the yaw stop module 13 is located at the end of the side beam 2. The lateral stop module 9 is located in the middle of the side beam 2, and the yaw stop module 13 is located at the end of the side beam 2, which are used to limit the lateral movement between the car body floor 1 and the bogie and the yaw rotation of the car body floor 1.

[0066] The bogie of the rail vehicle provided in this application also includes a magnetic rail brake 16 mounted below the side beam 2. The magnetic rail brake 16 is suspended on the axle bridge 15. Preferably, the magnetic rail brake 16 is located on the outside of the side beam 2. Specifically, the magnetic rail brake 16 is elastically supported on the axle bridge 15 and is located at the bottom of the drive unit. In this way, the components related to the drive and braking functions are all on the outside of the side beam 2, ensuring that the car body floor 1 can be embedded between the side beams 2, achieving the goal of a low-floor car body.

[0067] This application provides a rail vehicle including a bogie, wherein the bogie is any of the aforementioned types. The specific structure of the bogie has been described above; this application includes the aforementioned bogie and also achieves the aforementioned technical effects.

[0068] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0069] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bogie for a rail vehicle, characterized in that, include: The frame is composed of two side beams (2), which are distributed along the transverse direction of the rail vehicle, which is perpendicular to the direction of the rail vehicle's movement; the inner side of the side beam (2) is provided with a chamfer (20) that extends outward at the end position, and the inner side of the side beam (2) is the side surface of the two side beams (2) facing each other. Primary suspension (3); the two primary springs of the primary suspension (3) are installed at a first preset distance laterally offset, the laterally being the direction of the centrifugal force of the rail vehicle; The side beam connecting device consists of two axle bridges (15), which are distributed along the longitudinal direction of the rail vehicle. The two side beams (2) and the two axle bridges (15) are connected by the primary suspension (3) to form a "well" shaped structure. The longitudinal direction of the rail vehicle is the forward direction of the rail vehicle. The traction device (10) has one end connected to the axle body in the middle of the axle bridge (15) and the other end connected to the traction seat (103) connected to the chassis of the vehicle. The secondary suspension (8) has a side beam (2) with a concave area that is high at both ends and low in the middle. The secondary suspension (8) is installed in the concave area. The support surface of the secondary suspension (8) is lower than the second preset distance of the side roll center of the primary suspension (3). The traction device (10) includes a traction rod. The center of the axle bridge (15) is at the same height as the center of the wheel (12) of the rail vehicle. The axle bridge (15) has a traction device interface (18) in the middle facing the center of the bogie. The traction rod is installed in the traction device interface (18).

2. The bogie for a rail vehicle according to claim 1, characterized in that, It also includes a drive unit and a disc brake (17). The drive unit and the disc brake (17) are integrated and installed on the outside of the side beam (2). The outside of the side beam (2) is the side of the two side beams (2) facing away from each other.

3. The bogie for a rail vehicle according to claim 1, characterized in that, The spring of the primary suspension (3) is a double conical rubber spring and / or the spring of the secondary suspension (8) is a double hourglass rubber spring.

4. The bogie for a rail vehicle according to claim 1, characterized in that, The traction device (10) further includes a traction seat (103) and a traction connecting seat (102). The traction connecting seat (102) is installed on the traction seat (103). There are two traction rods. The two traction rods are respectively installed at both ends of the traction connecting seat (102), and the two traction rods and the traction connecting seat (102) are arranged in a Z-shape.

5. The bogie for a rail vehicle according to claim 1, characterized in that, Also includes: End process beams (19), comprising two beams, wherein when the axle bridge (15) needs to be removed, the two end process beams (19) are detachably connected to the opposite ends of the side beam (2), the ends of the two side beams (2) are connected by the process beams, and the two end process beams (19) are symmetrically arranged at the ends of the side beams (2); and / or A lateral stop module (9) and a sway stop module (13), wherein the lateral stop module (9) is disposed in the middle of the side beam (2) and the sway stop module (13) is disposed at the end of the side beam (2); and / or A magnetic track brake (16) and a drive unit, wherein the magnetic track brake (16) is mounted below the side beam (2), the magnetic track brake (16) is suspended on the axle bridge (15), and is located at the bottom end of the drive unit.

6. A rail vehicle, comprising a bogie, characterized in that, The bogie is the bogie according to any one of claims 1-5.

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