Wheel side drive device

Abstract

The present invention relates to a wheel-side drive device, belonging to the technical field of engineering machinery transmission. The device includes a motor installed on the outside of a wheel frame to determine the axis of rotation, the inner output end of the motor is connected to the torque tube supported on the wheel frame through a gear device; the torque tube is fixedly connected to the inner end of the wheel hub sleeved outside the motor, the outer end of the motor is connected to the wheel frame through a braking device, and is connected to the outer end of the wheel hub to form an external sealing device; wherein the two ends of the wheel hub are respectively sleeved and fixedly connected to the outer end of the inner rim and the inner end of the outer rim. Compared with the prior art, the wheel hub of the present invention is independently and firmly connected to the inner and outer rims, which significantly reduces the risk of slipping of the torque transmitted by the intermediate friction surface, and the force applied by each bolt during clamping and tightening is only half of the original force, so the force condition is better, and the hub adapter is reduced, and the structure is simpler.

Description

Technical Field

[0001] The invention relates to a wheel side drive device, in particular to a wheel side drive device of an off-road dump truck, and also relates to a brake and a motor and a connection method with the vehicle, belonging to the technical field of engineering machinery transmission. Background Art

[0002] The wheel drive device of an off-road dump truck is installed inside the tire of the vehicle, and drives the vehicle forward by reducing speed and increasing torque. For example, on a mechanical dump truck, the wheel drive device is at the end of the transmission chain, and its typical transmission route is that the power from the engine passes through the gearbox, and then through the main reducer to the wheel drive device. On an electric wheel dump truck, its typical transmission route is that the power from the engine is converted into electrical energy through the generator, and then through frequency conversion control, it provides driving force to the motor and drives the wheel drive device. While providing power to the vehicle, the wheel drive device bears the weight load of the entire vehicle.

[0003] The structure of the existing wheel side drive device is as follows Figure 1 As shown, the inner end of the motor 2 is connected to the torque tube 6 supported on the wheel frame 4 through the gear device 3, the torque tube 6 is connected to the inner end of the hub 9 installed outside the motor housing through the inner and outer bearings 7 and 10, and the outer end of the motor 2 is connected to the outer end of the hub 9 through the brake device 1 to form an external sealing structure; the two ends of the outer circle of the hub 9 are respectively equipped with the outer end of the inner rim 5 and the inner end of the outer rim 12 with a wedge-shaped closing, and the inner end of the outer circle of the hub 9 has a wedge-shaped stop matched with the wedge-shaped closing of the outer end of the inner rim 5. The outer end of the outer circle of the hub 9 is equipped with a wedge-shaped pressure ring 11 matched with the wedge-shaped closing of the inner end of the outer rim 12, and the outer end of the wedge-shaped pressure ring 11 is equipped with a wedge-shaped pressure ring 11 that is pressed against the end face of the hub 9, and then with the help of the wedge-shaped structure of the two ends of the outer circle of the hub 9 and the inner and outer rims and the spacer ring 8 clamped between the inner and outer rims, they are fixedly connected to each other. The advantage of this prior art is that the wheel hub and the rims on both sides are fastened at one time by a spacer ring and a pressure ring with the help of a fastener on one side, and they are fastened to each other by a wedge-shaped inclined surface, so the fixed structure is simple and compact, and the radial bearing capacity is strong. However, practice has proved that with the continuous increase in the tonnage of dump trucks, the structure of multiple contact surfaces that rely on friction to transmit torque is prone to slip after working for a period of time, resulting in failure.

[0004] The search found that Chinese Patent No. 201280012998.6 entered into China through PCT discloses a wheel assembly for use on an off-road vehicle, comprising: a generally cylindrical hub

[22] extending axially from a first end to a second end around an internal volume; a hub adapter

[72] fixed to the second end of the hub, the hub adapter comprising an outer peripheral shoulder

[102] , the outer peripheral shoulder

[102] having a first shoulder surface

[104] axially extending from the second end to the first end; a first wheel rim [12a12] mounted on the outer peripheral shoulder of the hub adapter

[72] at the first shoulder surface

[104] . b]; a generally cylindrical wheel carrier

[18] , which defines a wheel axis and extends from a mounting flange

[26] to a hub end along the wheel axis; and a generally cylindrical torque tube

[20] mounted around the wheel carrier

[18] and coaxial with the wheel carrier, the torque tube

[20] extending from a ring gear near the mounting flange of the wheel carrier

[18] to a hub flange

[38] near the hub end of the wheel carrier; wherein the first end of the wheel hub

[22] is bolted to the hub flange

[38] of the torque tube

[20] , and the second end of the wheel hub

[22] is arranged beside the hub end of the wheel carrier

[18] (the part number marked in the patent document is in [ ]). The wheel hub of this technical solution is connected to the rims on both sides by bolts, thereby overcoming the defect of slipping when mainly relying on the friction force of the contact surface to transmit torque, but it needs to add a hub adapter, the structure is relatively complicated, and in fact, it still mainly relies on the friction force generated by clamping to transmit torque, which is not reliable enough. Summary of the invention

[0005] The purpose of the present invention is to address the defects of the above-mentioned prior art and to provide a wheel side driving device which can not only effectively avoid slipping but also has a simple structure.

[0006] Analysis shows that the fundamental reason for the slippage of the above-mentioned prior art is that the clamping and fixing connection between the hub 9 and the inner rim 5 and the outer rim 12 completely relies on the fastener of the wedge-shaped pressure ring 11. Therefore, the manufacturing accuracy of the inclination angle of the wedge-shaped stop of the hub 9, the wedge-shaped pressure ring 11 and the corresponding parts of the inner rim 5 and the outer rim 12 and the manufacturing accuracy of the axial length S of the wedge-shaped pressure ring 11 directly affect the clamping and fixing force. The complex dimensional chain relationship formed between them is very strict on the distribution of manufacturing tolerances, and the manufacturing accuracy required in theory is difficult to achieve in practice.

[0007] In order to achieve the above-mentioned purpose, the basic technical scheme of the wheel-side drive device of the present invention is as follows: it includes a motor installed on the outside of the wheel frame to determine the rotation axis, and the inner output end of the motor is transmission-connected to the torque tube supported on the wheel frame through a gear device; the torque tube is fixedly connected to the inner end of the wheel hub sleeved outside the motor, and the outer end of the motor is connected to the wheel frame through a braking device, and is connected to the outer end of the wheel hub to form a sealing device; its improvement is that the two ends of the wheel hub are respectively sleeved and fixedly connected to the outer end of the inner rim and the inner end of the outer rim.

[0008] One of the specific technical solutions of the present invention is: the outer end of the inner rim has a wedge-shaped closing, the inner end of the hub has a wedge-shaped stop matching the wedge-shaped closing, the wedge-shaped stop and the pressure ring pressed on the outer end surface of the inner rim form a clamping and fastening structure for the wedge-shaped closing through the installed bolts; a perforated inner retaining ring with a hole extends toward the rotation axis near the inner end of the outer rim and abuts against the outer end surface of the hub with a threaded hole, and the fastener passes through the perforation of the inner retaining ring and is screwed into the threaded hole of the hub to form a pressing and fastening structure.

[0009] The second specific technical solution of the present invention is: an inner retaining wall with a perforation extends toward the rotation axis near the outer end of the inner rim, the inner end of the hub has a flange flange, the outer end surface of the flange flange is fitted with the inner end surface of the inner retaining wall, and a fastening structure is formed by the installed fasteners; an inner retaining ring with a perforation extends toward the rotation axis near the inner end of the outer rim and is abutted against the outer end surface of the hub with a threaded hole, the fastener passes through the perforation of the inner retaining ring and is screwed into the threaded hole on the outer end surface of the hub to form a pressed fastening structure.

[0010] Furthermore, the hub has an inner radial outer edge with a wedge-shaped stop formed on one side, and the inner radial outer edge and the end surface opposite to the pressure ring respectively have an edge ring concave and convex ring that match each other.

[0011] Furthermore, the inner retaining ring is pressed against the outer end surface of the wheel hub having a threaded hole at the radial outer edge of the outer end.

[0012] The third specific technical solution of the present invention is: the outer end of the inner rim has a wedge-shaped closing, and the inner end of the hub has a wedge-shaped stop formed on one side of the radial outer extension edge and matching the wedge-shaped closing; the inner end of the outer rim has a wedge-shaped closing, and the outer end of the hub is equipped with a beveled wedge ring, and the beveled wedge ring has a wedge-shaped inclined surface matching the wedge-shaped closing of the inner end of the outer rim; the outer end of the beveled wedge ring has a reduced diameter for pressing the outer end of the hub, and the inner end of its bevel extends out a wedge plug inserted into the radial interval between the hub and the outer rim; the wedge-shaped stop at the inner end of the hub and the wedge-shaped inclined surface of its outer beveled wedge ring respectively form a clamping and fastening structure for the wedge-shaped closings on both sides with the left clamping ring and the right clamping ring pressed on the outer end face of the inner rim.

[0013] Furthermore, the through hole of the bevel wedge ring is equipped with a stepped locking bolt that passes through the right clamping ring and the left clamping ring and is screwed into the radial outer extension edge. The small diameter section and the large diameter section of the locking bolt have reverse threads for screwing the left nut and the right nut respectively, and a locking nut is installed at the outer end thereof; the non-circular outer contours of the left nut and the right nut respectively match the countersunk holes at the corresponding positions of the left clamping ring and the right clamping ring to form a moving pair.

[0014] Compared with the prior art, the above technical solution has the wheel hub and the inner and outer rims independently fastened together, thereby significantly reducing the risk of slipping when transmitting torque on the intermediate friction surface, and the force applied by each bolt during clamping and fastening is only half of the original, resulting in better stress conditions; in addition, compared with the technical solution disclosed in Chinese patent 201280012998.6, the hub adapter is omitted, and the structure is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described in detail below with reference to the embodiments given in the accompanying drawings.

[0016] Figure 1 It is a structural schematic diagram of the prior art.

[0017] Figure 2 It is a structural diagram of embodiment 1 of the present invention.

[0018] Figure 3 It is a structural diagram of embodiment 2 of the present invention.

[0019] Figure 4 It is a structural diagram of embodiment 3 of the present invention.

[0020] Figure 5-1 yes Figure 2 A schematic diagram of a three-dimensional structure of a wheel hub adopted in an embodiment.

[0021] Figure 5-2 yes Figure 5-1 sectional view of .

[0022] Figure 5-3 yes Figure 5-1 Schematic diagram of the three-dimensional structure from another perspective.

[0023] Figure 6-1 yes Figure 2 A schematic diagram of another three-dimensional structure of a wheel hub adopted in an embodiment.

[0024] Figure 6-2 yes Figure 6-1 sectional view of .

[0025] Figure 6-3 yes Figure 6-1 Schematic diagram of the three-dimensional structure from another perspective.

[0026] Figure 7-1 yes Figure 3 A schematic diagram of a three-dimensional structure of a wheel hub adopted in an embodiment.

[0027] Figure 7-2 yes Figure 7-1 sectional view of .

[0028] Figure 7-3 yes Figure 7-1 Schematic diagram of the three-dimensional structure from another perspective.

[0029] Figure 8-1 yes Figure 3 A schematic diagram of another three-dimensional structure of a wheel hub adopted in an embodiment.

[0030] Figure 8-2 yes Figure 8-1 sectional view of .

[0031] Figure 8-3 yes Figure 8-1 Schematic diagram of the three-dimensional structure from another perspective. DETAILED DESCRIPTION

[0032] Embodiment 1

[0033] The wheel side driving device of this embodiment is as follows Figure 2 As shown, the wheel frame 4 is fixed on the vehicle body, and the traction motor 2 installed on the outside thereof determines the rotation axis. The inner output end of the motor 2 is connected to the torque tube 6 supported in the wheel frame 4 through the gear device 3, so the high-speed torque output by the traction motor 2 can be transmitted to the torque tube 6 after the speed is reduced and the torque is increased through the gear device 3. The flange edge of the outer end of the torque tube 6 is fixedly connected to the inner end of the wheel hub 9 installed outside the motor housing through the inner and outer bearings 7 and 10 through fasteners. The outer end of the motor 2 is connected to the wheel frame 4 through the brake device 1, and is connected to the outer end of the wheel hub 9 to form an external sealing device. The brake device 1 is composed of a brake caliper and a brake disc, wherein the brake caliper is connected to the wheel frame 4, and the brake disc is fixedly connected to the outer end of the motor 2. These basic structures are similar to the prior art and will not be described in detail.

[0034] The two ends of the wheel hub 9 are respectively fitted and fixed to the outer end of the inner rim 5 and the inner end of the outer rim 12. Specifically, the outer end of the inner rim 5 has a wedge-shaped closing 5-1, and the inner end of the wheel hub 9 has a wedge-shaped stopper 9-1 formed on one side of the radial outer extension edge 9-3 and matched with the wedge-shaped closing 5-1. The wedge-shaped stopper 9-1 and the pressure ring 8' pressed on the outer end surface of the inner rim 5 form a clamping and fastening structure for the wedge-shaped closing 5-1 through the installed bolts, and the radial outer extension edge 9-3 and the end surface opposite to the pressure ring 8' respectively have an edge ring concave 9-2 and a convex ring 5-2 matched with each other, so as to ensure that the inner and outer sides of the pressure ring 8' are respectively reliably pressed on the wheel hub 9 and the inner rim 5.

[0035] An inner retaining ring 12-1 with a perforation extends toward the rotation axis near the inner end of the outer rim 12. The inner retaining ring 12-1 is abutted against the outer end surface with a threaded hole at the radial outer edge 9-4 of the outer end of the hub 9. Bolts pass through the perforations of the inner retaining ring 12-1 and are screwed into the threaded holes of the hub 9 to form a clamping and fastening structure.

[0036] One of the specific structures of the hub in this embodiment is as follows Figure 5-1 , 5-2 As shown in Figures 5-3, the two ends of the hub tube 9-6 are respectively a radial outer edge 9-3 and a radial outer edge 9-4; one side of the radial outer edge 9-3 forms a wedge-shaped stop 9-1 matching the wedge-shaped closing 5-1, and the other side axially extends a connecting ring 9-7 with a reduced diameter; the radial outer edge 9-4 axially extends a connecting ring 9-9 with a reduced diameter; the end surface of the radial outer edge 9-3 is evenly spaced around the periphery for forming through holes for clamping and fastening the wedge-shaped closing 5-1 by passing bolts and a pressure ring 8', and the end surface of the connecting ring 9-7 is evenly spaced around the periphery for threaded holes for fixing with the torque tube 6; the end surface of the radial outer edge 9-4 is evenly spaced around the periphery for threaded holes for fixing with the inner retaining ring 12-1, and the end surface of the connecting ring 9-9 is evenly spaced around the periphery for threaded holes for fixing with the external sealing device. The outer surface of the hub tube 9-6 is circumferentially evenly spaced with reinforcing ribs 9-5 connecting the radial outer edge 9-3 and the radial outer edge 9-4, thereby achieving lightweighting of the hub.

[0037] Another lightweight design of the wheel hub in this embodiment is as follows Figure 6-1 , 6-2 , 6-3, and Figure 5-1 , 5-2 The difference between the design of 5-3 is that the reinforcing arcs 9-5' connecting the radial outer edge 9-3 and the radial outer edge 9-4 are evenly spaced outside the outer circle of the hub tube 9-6 in the circumferential direction.

[0038] During assembly, first, the inner rim 5 is put on the inner end of the wheel hub 9, so that the opposite wedge-shaped inclined surfaces are fitted and positioned, and then the pressing ring 8' is inserted, and the inner and outer sides of the pressing ring 8' are respectively pressed and held reliably on the wheel hub 9 and the inner rim 5 by fasteners; then the outer rim 12 is put on the inner retaining ring 12-1 and abutted against the outer end of the wheel hub 9, and then the fasteners are screwed into the threaded holes of the wheel hub 9 to press and fasten the outer rim 12. The disassembly steps are opposite, and both are very convenient.

[0039] In this embodiment, the wheel hub is independently fastened to the inner and outer rims, wherein the wheel hub and the outer rim are completely connected by fasteners, and the wheel hub and the inner rim are fastened by wedge-shaped inclined surfaces. This significantly reduces the risk of slipping due to friction torque transmission, while basically maintaining the advantage of strong radial bearing capacity. In addition, there is no need for a hub adapter, the structure is simple, and the manufacturing and assembly processes are simple.

[0040] Embodiment 2

[0041] The wheel side driving device of this embodiment is as follows Figure 3 As shown, the basic structure is the same as that of the first embodiment, except that an inner retaining wall 5-2 with a perforation extends from the outer end of the inner rim 5 toward the rotation axis, and the inner end of the hub 9 has a flange 9-2', the outer end surface of the flange 9-2' is in contact with the inner end surface of the inner retaining wall 5-2, and a fastening structure is formed by bolts and nuts installed therethrough. An inner retaining ring 12-2 with a perforation extends from the inner end of the outer rim 12 toward the rotation axis and abuts against the outer end surface of the hub 9 with a threaded hole, and bolts simultaneously pass through the perforations of the inner retaining ring 12-2 and the perforations of the outer sealing device, and are screwed into the threaded holes around the outer end surface of the hub 9 to form a pressing and fastening structure, and a fixed connection structure with the outer sealing device.

[0042] One of the specific structures of the hub in this embodiment is as follows Figure 7-1 , 7-2 As shown in Figures 7-3, the two ends of the hub barrel 9-6 are respectively the radial outer edge 9-3 and the radial outer edge 9-4; the end face of the radial outer edge 9-3 has perforations evenly spaced around the periphery for forming a fixed connection structure by fitting with the inner retaining wall 5-2 through bolts, and threaded holes evenly spaced around the inner periphery for fixing with the torque tube 6; the outer end face of the radial outer edge 9-4 has threaded holes evenly spaced around the periphery for simultaneously fastening the inner retaining ring 12-2 and the outer sealing device. The reinforcing ribs 9-5 connecting the radial outer edge 9-3 and the radial outer edge 9-4 are evenly spaced around the periphery of the outer surface of the hub barrel 9-6, thereby achieving lightweighting of the hub.

[0043] Another lightweight design of the wheel hub in this embodiment is as follows Figure 8-1 , 8-2 , 8-3, and Figure 7-1 , 7-2 The difference between the designs 7-3 and 7-3 is that the reinforcing arcs 9-5' connecting the radial outer edge 9-3 and the radial outer edge 9-4 are evenly spaced outside the outer circle of the hub tube 9-6 in the circumferential direction.

[0044] During assembly, first, the inner rim 5 is put on the inner retaining wall 5-2 to fit with the flange 9-2' at the inner end of the hub 9, and then the two are fixedly connected by fasteners to form a fastening structure; then the outer rim 12 is put on the inner retaining ring 12-2 to fit with the outer end of the hub 9, and then the fasteners are screwed into the threaded holes of the hub 9 to press and fasten the outer rim 12. The disassembly steps are reversed.

[0045] In this way, the two ends of the wheel hub are respectively fitted and fixedly connected to the outer end of the inner rim and the inner end of the outer rim. The advantage is that the wheel hub and the inner and outer rims are completely connected by fasteners, so the slipping phenomenon caused by friction torque transmission can be completely avoided, and the force applied by each bolt during clamping and fastening is only half of the original, and the force condition is better; there is no need for a hub adapter, the structure is simple, and the manufacturing and assembly process are simple.

[0046] Embodiment 3

[0047] The wheel side driving device of this embodiment is as follows Figure 4 As shown, the basic structure is the same as that of the first embodiment, and the outer end of the inner rim 5 has a wedge-shaped closure 5-1, the inner end of the hub 9 has a radial outer extension edge 9-3 on one side of which a wedge-shaped stop 9-1 is formed to match the wedge-shaped closure 5-1, the inner end of the outer rim 12 has a wedge-shaped closure 12-1, and the outer end of the hub 9 is provided with a beveled wedge ring 11', which has a wedge-shaped inclined surface matching the wedge-shaped closure 12-1 at the inner end of the outer rim 12; the significant difference is that the outer end of the beveled wedge ring 11' has a reduced diameter stop 11-2 for pressing the outer end of the hub 9, and the inner end of the bevel extends a wedge plug 11-1 inserted into the radial interval between the hub 9 and the outer rim 12. The wedge-shaped stop 9-1 at the inner end of the hub 9 and the wedge-shaped inclined surface of its outer bevel wedge ring 11' respectively form a clamping and fastening structure for the wedge-shaped ends 5-1 and 12-1 with the left clamping ring 8z and the right clamping ring 8y pressed on the outer end surface of the inner rim 5.

[0048] Specifically, the circumferentially evenly distributed through holes of the beveled wedge ring 11' are equipped with stepped locking bolts 13 that pass through the right clamping ring 8y and the left clamping ring 8z and then are screwed into the radial outer extension edge 9-3 of the hub 9. The small diameter section and the large diameter section of the locking bolt 13 have reverse threads for screwing the left nut 13z and the right nut 13y respectively, and a locking nut 14 is installed at the outer end; the non-circular outer contours (for example, hexagonal, etc.) of the left nut 13z and the right nut 13y respectively match the countersunk holes at the corresponding positions of the left clamping ring 8z and the right clamping ring 8y to form a moving pair.

[0049] During assembly, first, the inner rim 5 is put on the inner end of the hub 9, so that the relative wedge-shaped inclined surfaces fit and position, then the left clamping ring 8z is inserted, and then the locking bolt 13 with the left nut 13z and the right nut 13y is initially placed together with the right clamping ring 8y, and then the outer rim 12 and the beveled wedge ring 11' are installed, and the locking bolt 13 can be screwed into the radial outer edge 9-3 of the hub 9 by means of the inner hexagonal recess at the outer end of the locking bolt 13. At this time, the left nut 13z and the right nut 13y will move inward and outward respectively at the same time under the action of the reverse thread moving pair, first fix the inner rim 5 by means of the wedge stop 9-1 and the left clamping ring 8z, and then tighten the locking nut 14, while fixing the outer rim 12 by means of the clamping of the right clamping ring 8y and the beveled wedge ring 11', so that the thread pairs on the locking bolt 13 are mutually locked. The disassembly steps are reversed.

[0050] In this way, the two ends of the wheel hub are respectively fitted and fixed to the outer end of the inner rim and the inner end of the outer rim. The advantages are that the inner and outer rims are symmetrical and universal, easy to manufacture, and when assembling, only the locking bolts need to be installed from one end to tighten the rims through the wedge-shaped inclined surfaces with the help of the bidirectional threads. The clamping ring can ensure sufficient anti-slip clamping force, no strict axial accuracy requirements are required, and the radial bearing capacity is strong. The two opposite thread pairs have the function of balancing the clamping force of the inner and outer rims, so that the force of the entire device is balanced and reasonable.

[0051] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A wheel drive device, comprising a motor (2) mounted on the outside of a wheel frame (4) to determine a rotation axis, wherein the inner output end of the motor is transmission-connected to a torque tube (6) supported on the wheel frame via a gear device (3); the torque tube is fixedly connected to the inner end of a wheel hub (9) sleeved outside the motor, the outer end of the motor is connected to the wheel frame (4) via a brake device (1), and is connected to the outer end of the wheel hub to form an outer sealing device; characterized in that: The two ends of the wheel hub are respectively sleeved and fixedly connected to the outer end of the inner rim (5) and the inner end of the outer rim (12); The outer end of the inner rim has a wedge-shaped closing, and the inner end of the wheel hub has a wedge-shaped stop formed on one side of the radial outer extension edge and matched with the wedge-shaped closing; the inner end of the outer rim has a wedge-shaped closing, and the outer end of the wheel hub is equipped with a beveled wedge ring, and the beveled wedge ring has a wedge-shaped inclined surface matching with the wedge-shaped closing of the inner end of the outer rim; the outer end of the beveled wedge ring has a reduced diameter stop for pressing the outer end of the wheel hub, and the inner end of its bevel extends out a wedge plug inserted into the radial interval between the wheel hub and the outer rim; the wedge-shaped stop at the inner end of the wheel hub and the wedge-shaped inclined surface of its outer beveled wedge ring respectively form a clamping and fastening structure for the wedge-shaped closings on both sides with a left clamping ring pressed on the outer end face of the inner rim and a right clamping ring pressed on the inner end face of the outer rim; The through hole of the bevel wedge ring is equipped with a stepped locking bolt that passes through the right clamping ring and the left clamping ring and is screwed into the radial outer extension edge. The small diameter section and the large diameter section of the locking bolt have reverse threads for screwing the left nut and the right nut respectively, and the outer end thereof is equipped with a locking nut; the non-circular outer profiles of the left nut and the right nut are respectively matched with the countersunk holes at the corresponding positions of the left clamping ring and the right clamping ring to form a moving pair; with the help of the locking bolt, the locking bolt is screwed into the wheel hub, and at this time, the left nut and the right nut will simultaneously move inward and outward respectively under the action of the reverse thread moving pair.

2. The wheel drive device according to claim 1, characterized in that: The outer circumferential surface of the hub tube is evenly spaced in the circumferential direction to connect the radially extending edge and the radially outer edge with reinforcing ribs.

3. The wheel drive device according to claim 1, characterized in that: The outer circumference of the hub tube is circumferentially spaced and evenly spaced to connect the radially extending edge and the radially outer edge.

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