Rail vehicle drive

Abstract

The application discloses a driving device for a rail vehicle, which is characterized in that two sides of a motor are connected with a bogie through automatic adjusting mechanisms and wheel shaft box mechanism assemblies respectively. When the vehicle passes through a curve, the wheels swing in operation, the driving support shaft ball head makes universal rotation around the spherical lining in the flange, the circular rubber block connected with the flange, the crown nut and the rubber lining in the connecting bolt group can produce elastic displacement to adapt to the swing of the wheels. In addition, the repulsion between the two annular magnetic steel blocks in the flanges further provides a restoring force. When the wheels move laterally, the motor can adapt to the lateral displacement of the vehicle in operation by means of the displacement of the flange inner hole spline groove and the spline shaft, so that the motor is not damaged.

Description

Technical Field

[0001] This invention belongs to the field of drive systems for rail transit, and relates to drive devices for rail transit. Background Technology

[0002] Patent document CN201911322873.3 discloses a hub motor for directly driving the wheels of urban rail vehicles. When this motor is used in conjunction with the vehicle, problems arise due to the vehicle traversing curves, uneven rail surfaces, or wheel misalignment causing serpentine swaying and lateral movement of the wheels. This leads to mechanical failures in the disc motor and unstable vehicle operation, posing a significant safety hazard to the safe operation of the train. To address these issues, this application proposes a solution, namely a drive device.

[0003] With the rapid development of the electric motor field, high-power in-wheel motors for vehicles can now be designed and manufactured. To simultaneously achieve high torque direct drive of the wheels while improving the safety and smoothness of train operation, a high-power direct-drive in-wheel motor is desired. This motor rotor is directly connected to the wheel, directly driving the wheel and avoiding the mechanical losses associated with asynchronous motors and gearboxes, thus improving mechanical conversion efficiency and train smoothness. However, in practical applications, it has been found that in-wheel motors are prone to damage. Research and analysis have revealed that when the wheel travels on curved routes, there is serpentine swaying and lateral movement, which causes mechanical damage to the in-wheel motor.

[0004] To address the problem of motor damage, this invention seeks to design an automatic adjustment mechanism for serpentine oscillation and lateral movement. The support shaft flange and the lifting shaft flange are connected together via a crown nut and connecting bolt assembly. The ball joint on the support shaft can move in all directions around the spherical liner of the flange. The spline sleeve has a convex shape around its perimeter, which matches the hollow and concave shape of the spline end of the lifting shaft. During lateral movement, the spline sleeve can move along the spline end of the lifting shaft. Summary of the Invention

[0005] The purpose of this invention is to provide a drive device for rail vehicles that can protect the motor of the drive device when the vehicle undergoes serpentine swaying and lateral movement. It can adapt to the curved and lateral movements of the vehicle wheels while reducing the unsprung weight of the vehicle. Furthermore, it can ensure that the wheels continue to operate normally, continuously, smoothly, and safely even under severe vibrations caused by high-speed train operation.

[0006] To achieve the purpose of this invention, a rail vehicle drive device is designed, including a hub motor, a wheel axle box assembly, and an automatic adjustment mechanism. Both ends of the hub motor are connected to the bottom of the vehicle bogie via the wheel axle box assembly and the automatic adjustment mechanism, respectively. When the vehicle sways or undergoes lateral displacement, the entire hub motor structure moves relative to the bottom of the vehicle bogie with the aid of the wheel axle box assembly and the automatic adjustment mechanism.

[0007] Furthermore, the automatic adjustment mechanism includes: flange one and flange two, which are connected by flange flange plates. Circular rubber blocks are installed on the contact surfaces of the two flange flange plates. Through holes are formed along the outer edges of the two flange flange plates, and rubber sleeves are installed on the inner walls of the through holes. Bolts pass through the corresponding rubber sleeves on the two flange flange plates and are connected to crown nuts to achieve the connection between flange one and flange two. When flange one and flange two rotate or shift, the rubber bushings in the connected circular rubber blocks, crown nuts, and connecting bolts can elastically displace to accommodate the rotation or displacement.

[0008] Furthermore, annular grooves are respectively formed on the opposing surfaces of the two flange discs. Screw holes are formed at the bottom of the annular grooves, and magnetically conductive rings are installed at the bottom of the annular grooves. The magnetically conductive rings are installed by screws passing through the screw holes. A circular magnet is placed above the magnetically conductive ring, and a magnet protection plate is placed above the magnetic magnet. The magnet protection plate is fixed to the surface of the flange discs by screws. The circular magnets on flange one and flange two generate repulsive forces against each other. When flange one and flange two are displaced, a restoring force is further provided.

[0009] Furthermore, a through hole is opened in the center of the flange.

[0010] Furthermore, a spherical liner is opened on the surface of the flange disc of flange two.

[0011] Furthermore, a ball head is provided at the end of the shaft connected to the flange through hole. The ball head is located in the spherical liner and is rotatably connected to the spherical liner.

[0012] Furthermore, an internal spline groove is opened on the axial direction of flange two.

[0013] Furthermore, a spline shaft capable of axial displacement is provided in the internal spline groove.

[0014] Furthermore, the inner side of the support shaft of the hub motor is connected to the shaft, or the support shaft of the hub motor and the shaft are an integral structure.

[0015] Furthermore, the bogie chassis is connected to the spline shaft via a lifting shaft, or the lifting shaft and spline shaft are an integral structure.

[0016] Furthermore, the wheel axle box mechanism assembly includes: a rotor disc protruding bushing, an axle box body, rolling bearings, springs, and a wheel axle box assembly hanger. The rotor disc protruding bushing is fixedly connected to the rotor disc, extends from inside the wheel hub, and the outer periphery of the protruding end of the rotor disc protruding bushing is rotatably connected to the axle box body via rolling bearings. The axle box body is connected to the wheel axle box assembly hanger via an elastic component, and the wheel axle box assembly hanger is connected to the bottom of the bogie.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The drive device designed in this invention is characterized by using a crown nut to connect the support shaft end flange and the lifting shaft end flange. The crown nut prevents relative movement between the nut and bolt, ensuring a stable connection between the support shaft end flange and the lifting shaft end flange, while also providing space for the annular rubber block and rubber sleeve to elastically deform, thus mitigating impact force. Two magnetic blocks are installed between the support shaft end flange and the lifting shaft end flange. When the curved motion is eliminated, the two magnetic blocks generate a repulsive force, immediately restoring the elastic deformation of the annular rubber block and rubber sleeve. This avoids the impact on the disc motor caused by the vehicle's serpentine swaying and lateral movement due to curves, uneven rails, and wheel misalignment, reducing the mechanical wear of the disc motor and ensuring the vehicle can still operate normally, continuously, smoothly, and safely. Attached Figure Description

[0019] Appendix Figure 1 Schematic diagram of the overall structure of the rail vehicle drive unit.

[0020] Appendix Figure 2 : Overall structural diagram of the automatic adjustment mechanism.

[0021] Appendix Figure 3 Overall structural diagram of wheel axle box mechanism assembly.

[0022] Reference numerals: 1. Shaft; 2. Flange 1; 3. Circular magnet; 4. Rubber sleeve; 5. Circular rubber block; 6. Crown nut and bolt assembly; 7. Flange 2; 8. Splined shaft; 10. Automatic adjustment mechanism; 11. Rotor disc protruding bushing; 12. Axle box body; 13. Rolling bearing; 14. Elastic component; 15. Wheel axle box assembly hanger; 20. Hub motor; 30. Support shaft; 40. Bogie. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0024] like Figure 1As shown: The rail vehicle drive unit includes a hub motor, a wheel axle box assembly, and an automatic adjustment mechanism. The hub motor is connected to the bottom of the vehicle bogie at both ends via the wheel axle box assembly and the automatic adjustment mechanism, respectively. When the vehicle sways or undergoes lateral displacement, the hub motor's overall structure moves relative to the bottom of the vehicle bogie via the wheel axle box assembly and the automatic adjustment mechanism.

[0025] Specifically, such as Figure 2 As shown, the automatic adjustment mechanism includes: flange one and flange two, which are connected by flange flange plates. Circular rubber blocks are installed on the contact surfaces of the two flange flange plates. Through holes are formed along the outer edges of the two flange flange plates, and rubber sleeves are installed on the inner walls of the through holes. Bolts pass through the corresponding rubber sleeves on the two flange flange plates and are connected to crown nuts to achieve the connection between flange one and flange two. When flange one and flange two rotate or shift, the rubber bushings in the connected circular rubber blocks, crown nuts, and connecting bolts can elastically displace to accommodate the rotation or displacement.

[0026] Furthermore, annular grooves are respectively formed on the opposing surfaces of the two flange discs. Screw holes are formed at the bottom of the annular grooves, and magnetically conductive rings are installed at the bottom of the annular grooves. The magnetically conductive rings are installed by screws passing through the screw holes. A circular magnet is placed above the magnetically conductive ring, and a magnet protection plate is placed above the magnetic magnet. The magnet protection plate is fixed to the surface of the flange discs by screws. The circular magnets on flange one and flange two generate repulsive forces against each other. When flange one and flange two are displaced, a restoring force is further provided.

[0027] Furthermore, a through hole is opened in the center of the flange.

[0028] Furthermore, a spherical liner is opened on the surface of the flange disc of flange two.

[0029] Furthermore, a ball head is provided at the end of the shaft connected to the flange through hole. The ball head is located in the spherical liner and is rotatably connected to the spherical liner.

[0030] Furthermore, an internal spline groove is opened on the axial direction of flange two.

[0031] Furthermore, a spline shaft capable of axial displacement is provided in the internal spline groove.

[0032] Furthermore, the inner side of the support shaft of the hub motor is connected to the shaft, or the support shaft of the hub motor and the shaft are an integral structure.

[0033] Furthermore, the bogie chassis is connected to the spline shaft via a lifting shaft, or the lifting shaft and spline shaft are an integral structure.

[0034] When the wheels of a rail vehicle oscillate during operation, the rotor disk of the motor, integrated with the wheel hub, drives the ball joint of the support shaft to rotate omnidirectionally around the spherical bushing in the lifting shaft flange. The connected annular rubber block, crown nut, and rubber bushing in the connecting bolt assembly can elastically displace to accommodate the wheel's oscillation. Furthermore, two annular magnets are respectively installed between the support shaft end flange and the lifting shaft flange. The two annular magnets generate a repulsive force between themselves, further providing a restoring force for the wheel to return to its normal operating position. When the train wheels move laterally, the hub motor mechanism can move via the spline groove in the inner hole of the lifting shaft end flange and the spline shaft that slides on the fixed lifting shaft to accommodate the lateral displacement of the train during operation.

[0035] Specifically, such as Figure 3 As shown, the wheel axle box mechanism assembly includes: a rotor disc protruding bushing, an axle box body, rolling bearings, an elastic component, and a wheel axle box assembly hanger. The rotor disc protruding bushing is fixedly connected to the rotor disc and extends from inside the wheel hub. The outer circumference of the protruding end of the rotor disc protruding bushing is rotatably connected to the axle box body via rolling bearings. The axle box body is connected to the wheel axle box assembly hanger via the elastic component, and the wheel axle box assembly hanger is connected to the bottom of the bogie. A strong spring can be selected as the elastic component. The wheel axle box mechanism assembly is an important component group that bears the weight of the vehicle and is used for buffering the transmission to the wheels. Its task is to buffer the vertical vibration generated by the vehicle during operation, and then drive the rotor disc of the disc motor, which is parallel to the stator disc, to make radial displacement via the axial inner rolling bearing.

Claims

1. A rail vehicle drive arrangement, characterized by: It includes a hub motor, a wheel axle box mechanism assembly, and an automatic adjustment mechanism. The two ends of the hub motor are connected to the bottom of the vehicle bogie through the wheel axle box mechanism assembly and the automatic adjustment mechanism, respectively. When the vehicle sways or moves laterally, the hub motor structure moves relative to the bottom of the vehicle bogie with the help of the wheel axle box mechanism assembly and the automatic adjustment mechanism. The automatic adjustment mechanism includes: flange one and flange two, which are connected by flange flange plates respectively. Circular rubber blocks are set on the contact surfaces of the two flange flange plates respectively. Through holes are opened on the outer edges of the two flange flange plates, and rubber sleeves are set on the inner walls of the through holes. Bolts pass through the two rubber sleeves corresponding to the two flange flange plates and are connected to crown nuts to realize the connection of flange one and flange two. Annular grooves are respectively opened on the opposing surfaces of the two flange discs. Screw holes are opened at the bottom of the annular grooves. A magnetic ring is installed at the bottom of the annular groove. The magnetic ring is installed by screws passing through the screw holes. A circular magnet is set above the magnetic ring. A magnet protection plate is set above the circular magnet. The magnet protection plate is fixed to the surface of the flange disc by screws. The circular magnets on flange one and flange two generate repulsive forces on each other. A through hole is provided in the center of flange one, and a spherical liner is provided on the surface of the flange disc of flange two; A ball head is provided at the end of the shaft that is connected to the flange through hole. The ball head is located in the spherical liner and is rotatably connected to the spherical liner. An internal spline groove is opened in the axial direction of flange two, and a spline shaft capable of axial displacement is installed in the internal spline groove.

2. A rail vehicle drive arrangement according to claim 1, characterised in that: The inner side of the support shaft of the hub motor is connected to the shaft, or the support shaft of the hub motor and the shaft are an integral structure.

3. An arrangement according to claim 2, c h a r a c t e r i s e d in that: The bogie chassis is connected to the spline shaft via a lifting shaft, or the lifting shaft and spline shaft are an integral structure.

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