Permanent magnet direct-drive three-axle bogie and vehicle

Abstract

The invention discloses a permanent magnet direct drive three-axle bogie and a vehicle, the bogie comprises a framework and a direct drive wheel pair unit arranged on the framework, the direct drive wheel pair unit adopts a hollow shaft diaphragm coupling, and permanent magnet motors of three axles all adopt interchangeable suspension structures. The suspension arm is arranged on one side of the permanent magnet motor, the two swing rods are arranged on the other side of the permanent magnet motor, rubber joints are arranged on the suspension arm and the swing rods, the suspension arm and the swing rods are connected with the framework through the rubber joints, and two motor stopping plates connected with the permanent magnet motor are arranged between the two swing rods. The framework is fixedly provided with a transverse stopping plate extending between the two motor stopping plates, elastic stopping blocks are arranged on the two sides of the end portion of the transverse stopping plate and located between the two motor stopping plates, the free gap of the middle shaft is zero, and the end shaft is provided with a proper stopping gap. According to the invention, the transverse displacement adaptation amount of the diaphragm coupling, especially the intermediate shaft, can meet the transverse displacement amount of a motor and a wheel set of an elastic suspension structure.

Description

Technical Field

[0001] The present application relates to the technical field of rail transit vehicles, and in particular to a permanent magnet direct-drive three-axle bogie and vehicle. Background Art

[0002] The bogie equipped with permanent magnet direct-drive wheels eliminates the traditional gear transmission device, has no gear meshing noise, and is quieter; has no transmission energy loss, and is more energy-efficient; does not require the use of gear lubricants, and is more environmentally friendly; the direct-drive system has a simple structure and is more reliable; the direct-drive system is all-metal and can be maintenance-free during the overhaul maintenance cycle.

[0003] Patent CN110962873B discloses a high-power permanent magnet direct-drive three-axle bogie. Its technical solution adopts a hollow shaft diaphragm coupling to couple the rotation of the motor and the wheel. The first system adopts a pull rod for positioning. The traction device adopts a single pull rod to connect the bogie end beam and the middle part of the car body. The traction beam at the end of the frame is a flat upper and protruding lower structure.

[0004] Generally speaking, a certain lateral momentum is set between the end axle and the frame of a three-axle bogie. A larger lateral momentum is set between the intermediate axle and the frame than between the end axle to ensure good adaptability of the long-wheelbase three-axle bogie in curves. In order to reduce the guiding force of the intermediate axle and avoid faster wear than the end axle caused by the two-way guiding, a certain lateral momentum is usually set on the axle box bearing of the intermediate axle. In addition, due to the large end wheelbase, the three-axle bogie has a large wheel-rail attack angle, a large shaking inertia, a large wheel-rail dynamic effect and wear, and poor adaptability to mountain curves. The use of elastic frame suspension that releases the lateral motor mass is an important technical means to reduce the lateral dynamic effect of the wheel and rail.

[0005] The lateral displacement adaptability of the hollow shaft diaphragm coupling is limited, the limit displacement is usually less than 18mm, and the dynamic displacement is usually less than 12mm. If the intermediate shaft of the three-axle bogie adopts a hollow shaft diaphragm coupling, its lateral displacement adaptability is not enough to meet the lateral displacement of the motor and wheelset of the elastic suspension structure. During operation, the motor and wheelset may move in opposite directions with large displacements, which may cause damage to the diaphragm, fail to meet the corresponding reliability requirements, and fail to meet the overhaul cycle requirement of 2.4 million kilometers.

[0006] Therefore, in view of the above technical problems, how to make the lateral displacement adaptation amount of the diaphragm coupling meet the lateral displacement amount of the motor and wheelset of the elastic suspension structure is a technical problem that technical personnel in this field need to solve. Summary of the invention

[0007] The purpose of the present application is to provide a permanent magnet direct-drive three-axle bogie and vehicle, which solves the problem of lateral displacement adaptability of the diaphragm coupling.

[0008] To achieve the above object, the present application provides a permanent magnet direct drive three-axis bogie, which includes a frame and a direct drive wheel set unit provided on the frame. The direct drive wheel set unit directly transmits the torque of a permanent magnet motor to a wheel by using a hollow shaft diaphragm coupling. The bogie further includes a suspension arm provided on one side of the permanent magnet motor and two swing rods provided on the other side of the permanent magnet motor to form a three-point connection structure. Rubber joints are provided on both the suspension arm and the swing rods, and the rubber joints are connected to the frame. Two motor stop baffles connected to the permanent magnet motor are provided between the two swing rods. A transverse stop baffle extending between the two motor stop baffles is fixedly provided on the frame, and elastic stop blocks are arranged on both sides of the end of the transverse stop baffle. An adjusting shim is provided between the elastic stop block and the transverse stop baffle. The elastic stop block is located between the two motor stop baffles, and the stop gap between the elastic stop baffle and the motor stop baffle is adjusted by increasing or decreasing the adjusting shim. A preset stop gap is provided at the end shaft, and the stop gap at the intermediate shaft is zero, and the elastic stop block at the intermediate shaft enters between the two motor stop baffles in a pre-compressed state.

[0009] Preferably, parallel press plates are provided on the outer sides of the two elastic stop blocks of the intermediate shaft. The upper and lower ends of the two press plates are connected by process bolts, so that the elastic stop blocks enter between the two motor stop baffles in a pre-compressed state. After the installation is completed, the process bolts are removed.

[0010] Preferably, a flange surface is provided on one side of the suspension arm, and the flange surface is fixedly connected to the outer shell of the permanent magnet motor. A rubber joint is provided on the other side of the suspension arm, and a first joint core shaft is inserted through the rubber joint. The first joint core shaft is connected to the frame by bolts.

[0011] Preferably, rubber joints and second joint core shafts are provided at both ends of the swing rod. The second joint core shafts are inserted through the rubber joints, and the two second joint core shafts are respectively connected to the outer shell of the permanent magnet motor and the frame by bolts.

[0012] Preferably, the frame includes a pair of side beams, a plurality of cross beams connecting the pair of side beams, and a traction beam. The cross beams and the traction beam are arranged at intervals, so that the frame is in a shape of "mu", and the cross beams and the traction beam are structures with a sunken middle part.

[0013] Preferably, the cross beams include a first cross beam, a second cross beam, and a third cross beam. Swing rod mounting seats corresponding to the second joint core shafts are provided on the first cross beam, the second cross beam, and the third cross beam. Suspension arm mounting seats corresponding to the first joint core shafts are provided on the second cross beam, the third cross beam, and the traction beam.

[0014] Preferably, an anti-dropout bolt is installed at the root of the suspension arm mounting seat by means of bolts. The anti-dropout bolt is located at the lower side of the suspension arm mounting seat and there is a gap between the anti-dropout bolt and the suspension arm. The gap is smaller than the height difference between the lower surface of the suspension arm mounting seat and the upper surface of the first joint core shaft.

[0015] Preferably, the traction beam is located at the end of the frame, and a traction device is provided on the traction beam. The traction device adopts an inclined single-rod structure and is arranged toward the center of the vehicle body.

[0016] Preferably, it also includes a suspension device arranged on the lower side of the side beam, the suspension device adopts a steel coil spring, a single tie rod and a vertical shock absorber, wherein the axle box tie rod of the end shaft is arranged toward the center of the frame, and the axle box tie rod of the intermediate shaft is installed together with the axle box tie rod of the other end shaft on the tie rod seat of the frame.

[0017] Preferably, it also includes a secondary suspension device arranged on the upper side of the side beam, and the secondary suspension device includes a high-flex steel round spring arranged in the center of the side beam to support the vehicle body, the vertical shock absorber and the lateral shock absorber.

[0018] A vehicle comprises the permanent magnet direct-drive three-axle bogie described above.

[0019] Compared with the above-mentioned background technology, the direct-drive wheelset unit of the present application adopts a hollow shaft diaphragm coupling, which releases the degrees of freedom of the motor and the wheelset except rotation to a certain extent, but its lateral displacement adaptability is limited; in this regard, the permanent magnet motor of the present application adopts a frame suspension installation, and the stop gap between the elastic stop plate and the motor stop plate can be adjusted to make the middle shaft of the bogie a rigid frame suspension, and the end shaft of the bogie an elastic frame suspension. Specifically, the two sides of the permanent magnet motor are connected to the frame through suspension arms and rocker arms to form a three-point structure. The stop gap of the middle shaft is zero, which limits the lateral swing of the motor and the frame to form a rigid frame suspension. The end shaft is provided with a certain stop gap and a coupling shock absorber to form an elastic frame suspension. In order to reduce the guiding force on the intermediate shaft on the curve, the intermediate shaft bearing is set with a certain lateral momentum. The maximum lateral movement between the permanent magnet motor and the wheelset increases the bearing lateral momentum on the basis of the end shaft, which is greater than the lateral displacement adaptability of the diaphragm coupling. Therefore, the stop gap of the intermediate shaft is set to zero, and the lateral displacement adaptability of the diaphragm coupling can meet the maximum lateral movement between the motor and the wheelset, thereby solving the lateral displacement adaptability problem of the intermediate diaphragm coupling. In addition, the bogie adopts a rigid suspension of the intermediate shaft and an elastic suspension of the end shaft, which ensures the interchangeability of the motor and releases the lateral mass between the springs and the shaking inertia of the end shaft. The original large wheel-rail effect of the end shaft is reduced, and the stability of the bogie is improved, which further significantly improves the reliability and maintenance cycle of the wheel axle drive unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the structure of a permanent magnet direct-drive three-axle bogie provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the structure of the suspension arm provided in an embodiment of the present application;

[0023] Figure 3 A cross-sectional view of a suspension arm provided in an embodiment of the present application;

[0024] Figure 4 A schematic diagram of the structure of the swing arm provided in the embodiment of the present application;

[0025] Figure 5 A schematic diagram of the structure of the transverse stop plate and the motor stop plate provided in the embodiment of the present application;

[0026] Figure 6 A schematic diagram of the structure of the pressure plate provided in the embodiment of the present application;

[0027] Figure 7 A schematic diagram of the cooperation structure between the pressure plate and the elastic stop block provided in the embodiment of the present application;

[0028] Figure 8 A schematic diagram of the architecture provided in the embodiment of the present application;

[0029] Fig. 9 A schematic diagram of the principles of the end shafts and intermediate shafts of the three-axle bogie provided in an embodiment of the present application.

[0030] In the figure: 1-permanent magnet motor; 2-suspension arm; 3-primary suspension device; 4-end shaft axle box; 5-intermediate shaft axle box; 6-frame; 7-traction device; 8-secondary suspension device; 9-brake device; 10-wheel; 11-rocker; 12-second joint spindle; 13-first joint spindle; 14-anti-drop bolt; 15-motor stop plate; 16-lateral stop plate; 17-adjusting gasket; 18-elastic stop block; 19-side beam; 20-first cross beam; 21-second cross beam; 22-third cross beam; 23-traction beam; 24-rocker mounting seat; 25-suspension arm mounting seat; 26-pull rod seat; 27-pressure plate. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] It should be noted that in this embodiment, the directions or positional relationships indicated by "upper", "lower", "front", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] The hollow shaft diaphragm coupling is a key component of the permanent magnet direct drive locomotive. The permanent magnet direct drive transmission device using the hollow shaft diaphragm coupling, the hollow shaft of the diaphragm coupling is mounted on the axle, and the hollow rotor of the direct drive motor is mounted on the hollow shaft of the diaphragm coupling. One end of the diaphragm coupling is connected to the motor rotor, and the other end is connected to the driving wheel. The high flexibility in the thickness direction of the diaphragm is used to achieve axial and radial displacement, thereby constraining the rotation of the wheelset and the motor, transmitting the motor torque to the wheel, and at the same time releasing the degree of freedom of displacement to a certain extent, ensuring the feasibility of the frame-suspended permanent magnet direct drive bogie drive device solution.

[0035] A major advantage of this transmission device is that it eliminates the complex gearbox, the gears and transmission bearings that are easily damaged, the noise of gear meshing, and the need for lubricating oil. It avoids a series of stubborn faults and shortcomings that may be caused by gear transmission, such as bearing erosion, gear wear and broken teeth, shaft fatigue, gearbox oil leakage and emulsification, gear meshing noise, etc., and improves reliability, availability and environmental performance. Another major advantage of this direct drive structure is that the maintenance cycle is significantly improved. The direct drive motor bearing has a low speed and a large bearing rated load. The calculated life is far longer than the life of traditional motor bearings. The maintenance cycle is twice that of conventional motor bearings, and is expected to reach 2.4 million kilometers. The original gear-driven motor bearings and transmission bearings were the bottlenecks of the drive overhaul cycle. Now that the direct drive structure is adopted, there is no such bottleneck limitation. In order to improve the overhaul cycle of the entire drive unit, it is necessary to ensure that the overhaul cycle of the diaphragm coupling is synchronized with the permanent magnet motor, so that the overall overhaul cycle of the entire drive can be increased to 2.4 million kilometers.

[0036] To improve the maintenance cycle of the direct drive structure, the overall structure of the bogie must ensure that the relative displacement between the direct drive motor and the wheelset during operation is small enough, so as to ensure that the service life of the diaphragm coupling is increased to 2.4 million kilometers. The diaphragm coupling is an all-metal part with a long maintenance-free cycle. Its weak component is the diaphragm group, and its high lateral deflection deformation is the main component of its fatigue damage. The load of the diaphragm group comes from three aspects: first, there is pre-tightening pressure when installing the diaphragm group bolts; second, the diaphragm group transmits the large torque of the direct drive motor; and third, the diaphragm group adapts to axial and radial displacements through elastic deformation. These three aspects together constitute the input of the diaphragm load. The first two are inherent inputs determined by the overall performance requirements of the locomotive, and the latter is the input caused by the structure of the bogie. To improve the service life of the diaphragm coupling, the displacement that the diaphragm group needs to adapt to can only be reduced as much as possible from a structural perspective.

[0037] Please refer to Fig. 9 For three-axle bogies, in order to ensure the adaptability of the three wheelsets to curves and good stability, the lateral momentum of the end axle box bearings is basically zero, and the intermediate shaft axle box bearings are set with a larger lateral momentum; relative to the end axles, the lateral momentum of the intermediate shaft motor and wheelset needs to increase the lateral displacement of the wheelset required to adapt to the curve. If the intermediate shaft is not specially set, the lateral displacement that the coupling diaphragm group of the intermediate shaft needs to adapt to is the largest, and its service life will be significantly reduced, and may not reach 2.4 million kilometers.

[0038] The elastic stop of the intermediate shaft adopts the installation method of pre-compressed laminated rubber to match the appropriate stiffness. In this way, the free clearance of the stop is zero, but the elastic clearance can be controlled within a certain range during normal operation, which can reduce the displacement of the intermediate shaft diaphragm coupling, effectively increase the service life of the diaphragm coupling, and ensure that the maintenance cycle reaches 2.4 million kilometers, so that the advantages of the three-axis direct-drive bogie can be brought into play. In summary, this application proposes a technical solution for a lateral elastic stop of the intermediate shaft, which is as follows:

[0039] like Figures 1 to 8 As shown, in this embodiment, a permanent magnet direct drive three-axle bogie is provided, including a frame 6 and a direct drive wheel pair unit arranged on the frame 6. The direct drive wheel pair unit adopts a hollow shaft diaphragm coupling to directly transmit the torque of the permanent magnet motor 1 to the wheel 10. The permanent magnet motor 1 is mounted by frame suspension. Specifically, a suspension arm 2 is arranged on one side of the permanent magnet motor 1, and two rocker rods 11 are arranged on the other side of the permanent magnet motor 1, thereby forming a three-point connection structure connected to the frame 6. The three-axle bogie is correspondingly provided with three permanent magnet motors 1, and the three permanent magnet motors 1 are indistinguishable and interchangeable.

[0040] The suspension arm 2 and the swing rod 11 are both provided with rubber joints, and the suspension arm 2 and the swing rod 11 are connected to the frame 6 through the rubber joints. Figure 4 and Figure 5 Two motor stop plates 15 connected to the permanent magnet motor 1 are provided between the two rocker arms 11, a transverse stop plate 16 extending between the two motor stop plates 15 is fixedly provided on the frame 6, and elastic stop blocks 18 are provided on both sides of the ends of the transverse stop plates 16, an adjustment gasket 17 is provided between the elastic stop block 18 and the transverse stop plate 16, the elastic stop block 18 is located between the two motor stop plates 15, and the stop gap between the elastic stop plate and the motor stop plate 15 is adjusted by adding or removing the adjustment gasket 17.

[0041] It should be emphasized that the intermediate shaft of the present application adopts a rigid suspension, that is, the elastic stop block 18 at the intermediate shaft enters between the two motor stop plates 15 in a pre-compressed state, so that the stop gap between the elastic stop block 18 at the intermediate shaft and the motor stop plate 15 is zero, and the stiffness of the elastic stop block 18 of the intermediate shaft is designed to produce a suitable displacement within the lateral operating load of the permanent magnet motor 1. This displacement value will not be greater than the pre-compression amount, so that the normally operating permanent magnet motor 1 and the frame 6 are always kept in contact through the stopper, and this displacement value can also ensure that the lateral relative displacement of the permanent magnet motor 1 and the wheelset of the intermediate shaft meets the displacement capacity of the diaphragm coupling; the vertical and longitudinal movement of the permanent magnet motor 1 relative to the frame can be adapted by the smaller shear stiffness of the laminated spring, thereby limiting the lateral swing of the permanent magnet motor 1 and the frame 6 while adapting to the longitudinal and vertical micro-movement of the permanent magnet motor 1 and the wheelset. The end shaft of the present application adopts an elastic suspension, and the end shaft has a preset stop gap, that is, the end shaft is provided with a certain stop gap and a coupling shock absorber, and the size of the stop gap can be set according to actual conditions.

[0042] The direct-drive transmission device adopts a hollow shaft diaphragm coupling, which releases the degrees of freedom of the permanent magnet motor 1 and the wheelset except rotation to a certain extent, but its lateral displacement adaptability is limited; the end shaft bearing has no lateral momentum, and the lateral stop gap size of the end shaft permanent magnet motor 1 is set so that the maximum lateral movement between the motor and the wheelset is less than the lateral displacement adaptability of the hollow shaft diaphragm coupling; in order to make the guiding force on the intermediate shaft on the curve smaller, the intermediate shaft bearing is set with a certain lateral momentum, and the maximum lateral movement between the permanent magnet motor 1 and the wheelset is increased by the lateral momentum of the bearing on the basis of the end shaft, which is greater than the lateral displacement adaptability of the hollow shaft diaphragm coupling, so the lateral stop gap of the intermediate shaft permanent magnet motor 1 is set to zero, and the lateral displacement adaptability of the hollow shaft diaphragm coupling can meet the maximum lateral movement between the permanent magnet motor 1 and the wheelset.

[0043] In addition, the use of rigid suspension for the intermediate shaft and elastic suspension for the end shaft releases the shaking inertia at the end shaft and the lateral mass between the springs. The originally large wheel-rail effect of the end shaft is reduced, and the operating stability of the bogie is improved.

[0044] Please refer to Figure 6 and Figure 7, on the outer sides of the two elastic stoppers 18 of the intermediate shaft, there are relatively parallel pressure plates 27. The upper and lower ends of the two pressure plates 27 are connected by process bolts. By tightening the process bolts, the elastic stoppers 18 are in a compressed state. During installation, the laterally stopped plate 16 of the intermediate shaft in the compressed state is placed between the two motor stopped plates 15, and then the process bolts are removed, so that the elastic stoppers 18 form a pre-compressed state between the two motor stopped plates 15. The elastic stoppers 18 are designed as metal laminated rubber parts, with the characteristics of large axial stiffness and small tangential stiffness. The laterally stopped plate 16 of the intermediate shaft restricts the lateral swing of the permanent magnet motor 1 and the frame 6, and no coupling shock absorber is provided on the intermediate shaft.

[0045] Please refer to Figure 2 and Figure 3 , on one side of the suspension arm 2, there is a flange surface, which is fixedly connected to the outer shell of the permanent magnet motor 1 through the flange surface. On the other side of the suspension arm 2, there is a rubber joint, and a first joint spindle 13 is passed through the rubber joint. The first joint spindle 13 is connected to the frame 6 by bolts; Please refer to Figure 4 , rubber joints and second joint spindles 12 are provided at both ends of the swing rod 11. The second joint spindles 12 are passed through the rubber joints, and the two second joint spindles 12 are respectively connected to the outer shell of the permanent magnet motor 1 and the frame 6 by bolts. To ensure the interchangeability of the permanent magnet motor 1, the setting methods of the suspension arms 2 and the swing rods 11 on each permanent magnet motor 1 are the same, and the setting methods of the motor stop plates 15, the lateral stop plates 16, and the supporting elastic stoppers 18 and adjusting gaskets 17 are also the same. By adjusting the stop gap, the switching between elastic suspension and rigid suspension is realized, ensuring the consistency of the installation interface of the permanent magnet motor 1, thereby realizing the interchangeability of the motors.

[0046] Please refer to Figure 8 , the frame 6 includes a pair of side beams 19, a plurality of cross beams connecting the pair of side beams 19, and a traction beam 23. The cross beams and the traction beam 23 are arranged at intervals, so that the frame 6 is in a "mesh" shape. The traction beam 23 is arranged on the end beam. To adapt to the installation of the permanent magnet motor 1 suspension, the cross beams and the traction beam 23 are of a middle-sunken structure.

[0047] Furthermore, the cross beams include a first cross beam 20, a second cross beam 21, and a third cross beam 22. Swing rod mounting seats 24 corresponding to the second joint spindles 12 are provided on the first cross beam 20, the second cross beam 21, and the third cross beam 22. Suspension arm mounting seats 25 corresponding to the first joint spindles 13 are provided on the second cross beam 21, the third cross beam 22, and the traction beam 23. The suspension arm mounting seats 25 are integrally machined parts, which are arranged on the vertical plates of the second cross beam 21, the third cross beam 22, and the traction beam 23, and form a combined part with the vertical plates in the form of butt welding.

[0048] Please refer to Figure 2 and Figure 3, the root of the suspension arm mounting seat 25 is installed with an anti-dropping bolt 14 by bolts, and the anti-dropping function of the permanent magnet motor 1 is realized by the anti-dropping bolt 14 and the swing rod 11. It is pointed out above that the first joint core shaft 13 of the suspension arm 2 is connected to the suspension arm mounting seat 25 by two bolts, and the flange surface at the other end is provided with multiple mounting bolts to connect with the housing of the permanent magnet motor 1, and the weakest position is the mounting bolt at the connection between the suspension arm 2 and the suspension arm mounting seat 25; the first swing rod and the second swing rod are connected to the housing of the permanent magnet motor 1 and the swing rod mounting seat 24 by swing rod mounting bolts, and the weakest position is the mounting bolt at the swing rod mounting seat 24; on this basis, the anti-dropping bolt 14 is located at the lower side of the suspension arm mounting seat 25, and there is a gap between it and the suspension arm 2, and the gap is smaller than the height difference between the lower surface of the suspension arm mounting seat 25 and the upper surface of the first joint core shaft 13, so that even if the mounting bolt at the connection of the suspension arm mounting seat 25 is loosened, the suspension arm 2 and the first joint core shaft 13 still cannot be separated from the locking of the anti-dropping bolt 14 and the suspension arm mounting seat 25, forming an anti-dropping protection. The two swing rods 11 on the other side, if the mounting bolts of any swing rod 11 are loosened, there is another swing rod 11 left to connect the permanent magnet motor 1 and the frame 6. The anti-slip function of the entire motor is realized by adding only one anti-slip bolt 14, and the structure is simple and reliable.

[0049] A traction device 7 is provided on the traction beam 23. The traction device 7 adopts an inclined single-rod structure and is arranged toward the center of the vehicle body. No further restrictions will be made here and reference may be made to the prior art.

[0050] The bogie also includes a primary suspension device 3 arranged on the lower side of the side beam 19. The primary suspension device 3 adopts steel coil springs, single tie rods and vertical shock absorbers, wherein the axle box tie rods of the end shafts are arranged toward the center of the bogie, and the axle box tie rods of the intermediate shafts and the axle box tie rods of the other end shafts are installed together on the tie rod seat 26 of the frame 6, ensuring the compactness of the overall structure of the bogie and achieving the maximum shortening of the wheelbase.

[0051] In addition, the end shaft of the end shaft axle box 4 is configured without a lateral momentum bearing, and a series of lateral momentum is set between the end shaft axle box 4 and the frame; the intermediate shaft axle box 5 is configured with a lateral momentum bearing, and a series of lateral momentum is set between the intermediate shaft axle box 5 and the frame 6 to adapt to the curve passage of the three-axle bogie.

[0052] The bogie also includes a secondary suspension device 8 arranged on the upper side of the side beam 19. The secondary suspension device 8 includes a high-flex steel coil spring arranged in the center of the side beam 19 to support the car body, and is supplemented by a vertical shock absorber and a lateral shock absorber.

[0053] It also includes a braking device 9, which can be set with a disc basic brake or a tread basic brake; the space between the two wheels 10 on the same side can and only can ensure the normal operation and maintenance function requirements of the braking device 9, thereby, the wheelbase of the bogie is minimized to the maximum extent, the bogie's shaking inertia and the end axle lateral mass are significantly reduced, the wheelset dynamic effect is significantly reduced, and the wheel 10 wear is significantly reduced.

[0054] In summary of the above embodiments, the intermediate shaft of the hollow shaft diaphragm coupling direct drive system of the present application adopts a rigid frame suspension and the end shaft adopts an elastic frame suspension. With this as the core, the traction device 7 is arranged at the end of the frame 6, and the motor anti-falling structure composed of the suspension arm mounting seat 25, the suspension arm 2 and the anti-falling bolt 14, and the single pull rod positioning and its arrangement together constitute the compact structure of the bogie assembly. This compact structure allows the bogie wheelbase to be shortened to the greatest extent, which not only reduces the lateral movement of the intermediate shaft through the curve, but also significantly reduces the bogie shaking inertia. Combined with the frame-suspended direct drive system, the unsprung weight is significantly reduced, the wheelset power effect is significantly reduced, and the wheel 10 wear is significantly reduced. Further combined with the use of the hollow shaft diaphragm coupling direct drive device with a simple structure, the reliability of the wheelset drive unit is significantly improved, the maintenance cycle is significantly improved, and the advantages of permanent magnet direct drive technology on three-axle bogies are fully utilized.

[0055] The present application also provides a vehicle, which includes the above-mentioned permanent magnet direct-drive three-axle bogie.

[0056] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0057] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A permanent magnet direct drive three-axle bogie, comprising a frame (6) and a direct drive wheelset unit arranged on the frame (6), wherein the direct drive wheelset unit uses a hollow shaft diaphragm coupling to directly transmit the torque of a permanent magnet motor (1) to a wheel (10), characterized in that: It further includes a suspension arm (2) provided on one side of the permanent magnet motor (1) and two swing rods (11) provided on the other side of the permanent magnet motor (1) to form a three-point connection structure. Rubber joints are provided on both the suspension arm (2) and the swing rods (11), and they are connected to the frame (6) through the rubber joints. Two motor stop baffles (15) connected to the permanent magnet motor (1) are provided between the two swing rods (11). A transverse stop baffle (16) extending between the two motor stop baffles (15) is fixedly provided on the frame (6), and elastic stop blocks (18) are arranged on both sides of the end of the transverse stop baffle (16). An adjustment gasket (17) is provided between the elastic stop block (18) and the transverse stop baffle (16). The elastic stop block (18) is located between the two motor stop baffles (15), and the stop gap between the elastic stop baffle and the motor stop baffle (15) is adjusted by increasing or decreasing the adjustment gasket (17). There is a preset stop gap at the end shaft, the stop gap at the intermediate shaft is zero, and the elastic stop block (18) at the intermediate shaft enters between the two motor stop baffles (15) in a pre-compressed state.

2. The permanent magnet direct drive three-axle bogie according to claim 1, characterized in that: Parallel pressure plates (27) are provided on the outer sides of the two elastic stop blocks (18) of the intermediate shaft. The upper and lower ends of the two pressure plates (27) are connected by process bolts, so that the elastic stop blocks (18) enter between the two motor stop baffles (15) in a pre-compressed state. After installation, the process bolts are removed.

3. The permanent magnet direct drive three-axle bogie according to claim 2, characterized in that: One side of the suspension arm (2) is provided with a flange surface, and it is fixedly connected to the outer shell of the permanent magnet motor (1) through the flange surface. The other side of the suspension arm (2) is provided with the rubber joint, and a first joint core shaft (13) is arranged through the rubber joint. The first joint core shaft (13) is connected to the frame (6) by bolts.

4. The permanent magnet direct drive three-axle bogie according to claim 3, characterized in that: Rubber joints and second joint core shafts (12) are provided at both ends of the swing rod (11). The second joint core shafts (12) are arranged through the rubber joints, and the two second joint core shafts (12) are respectively connected to the outer shell of the permanent magnet motor (1) and the frame (6) by bolts.

5. The permanent magnet direct drive three-axle bogie according to claim 4, characterized in that: The frame (6) includes a pair of side beams (19), a plurality of cross beams connecting the pair of side beams (19), and a traction beam (23). The cross beams and the traction beam (23) are arranged at intervals, so that the frame (6) is in a "mesh" shape. The cross beams and the traction beam (23) are of a structure with a sunken middle part.

6. The permanent magnet direct drive three-axle bogie according to claim 5, characterized in that: The cross beams include a first cross beam (20), a second cross beam (21), and a third cross beam (22). Swing rod mounting seats (24) corresponding to the second joint core shafts (12) are provided on the first cross beam (20), the second cross beam (21), and the third cross beam (22). Suspension arm mounting seats (25) corresponding to the first joint core shafts (13) are provided on the second cross beam (21), the third cross beam (22), and the traction beam (23).

7. The permanent magnet direct drive three-axle bogie according to claim 6, characterized in that: An anti-dropout bolt (14) is installed at the root of the suspension arm mounting seat (25) by means of bolts. The anti-dropout bolt (14) is located at the lower side of the suspension arm mounting seat (25) and there is a gap between the anti-dropout bolt (14) and the suspension arm (2). The gap is smaller than the height difference between the lower surface of the suspension arm mounting seat (25) and the upper surface of the first joint core shaft (13).

8. The permanent magnet direct drive three-axle bogie according to claim 5, characterized in that: The traction beam (23) is located at the end of the frame (6), and a traction device (7) is provided on the traction beam (23). The traction device (7) adopts an inclined single-rod structure and is arranged toward the center of the vehicle body.

9. The permanent magnet direct drive three-axle bogie according to claim 5, characterized in that: It also includes a suspension device (3) arranged on the lower side of the side beam (19), wherein the suspension device (3) uses a steel coil spring, a single tie rod and a vertical shock absorber, wherein the axle box tie rod of the end shaft is arranged toward the center of the frame (6), and the axle box tie rod of the intermediate shaft and the axle box tie rod of the other end shaft are installed together on the tie rod seat (26) of the frame (6).

10. The permanent magnet direct drive three-axle bogie according to claim 5, characterized in that: It also includes a secondary suspension device (8) arranged on the upper side of the side beam (19), the secondary suspension device (8) including a high-flex steel round spring arranged in the center of the side beam (19) to support the vehicle body, and is supplemented by a vertical shock absorber and a lateral shock absorber.

11. A vehicle, characterized in that: It comprises the permanent magnet direct-drive three-axle bogie as described in any one of claims 1-10.

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