Hub driving structure

Abstract

The invention relates to a wheel hub driving structure, which is formed by arranging a motor set, a gear set, an external rotation input set and a wheel shell on a wheel hub shaft, and an inner cover body of the motor set can be fixedly arranged on the wheel hub shaft by utilizing a shaft tube arm, so that when a motor is electrified to actuate a rotor to drive the wheel shell, stable abutting force can be obtained, and the wheel shell can be prevented from being damaged. The starting driving force of the hub is effectively improved, unnecessary dynamic loss is further reduced, meanwhile, the rotor of the motor set and the gear set can be coaxially arranged on the output shaft sleeve of the motor set, the concentricity of the gear set can be effectively ensured, the operation stability of the gear set is improved, and the shaking noise phenomenon can be reduced.

Description

[Technical field]

[0001] The present invention belongs to the technical field of wheel hubs of electric vehicles, and specifically refers to a wheel hub driving structure with a driving motor, whereby the stator of the motor can be fixed on the wheel hub shaft through an inner cover, so that when the motor is energized to activate the rotor to drive the wheel shell, a stable resistance force is obtained, thereby effectively improving its initial driving force and reducing unnecessary dynamic loss. [Background technology]

[0002] In recent years, electric-assisted bicycles that use motors to assist the driving force generated by human power have become very common. Electric-assisted bicycles mainly use the pedaling force of the rider and the assistance provided by a power output mechanism (such as a hub motor) to obtain forward power, which will not cause too much burden on the rider's physical strength. The hub motors of the above-mentioned electric-assisted bicycles are divided into inner rotor type and outer rotor type. Among them, the inner rotor hub motor has a stator set near the outer side of the hub shell, so the coil heat energy is easier to dissipate to the outside, and its rotor is set near the inner side of the hub shaft, which has the advantages of small rotational inertia and easy to drive.

[0003] The industry has developed a variety of inner rotor hub motors for electric-assisted bicycles, such as the bicycle hub with a motor inside the hub of Publication No. 1455850, the electric drive hub system for vehicles and the vehicle including the system of Publication No. 1680908, and the inner rotor hub motor of Publication No. 1770780. However, the design of the above-mentioned existing hub motors will cause the motor to be unable to obtain effective resistance due to the unstable orientation of the stator when it is powered on, resulting in unnecessary dynamic loss, reducing the initial driving force of the hub, and at the same time, the concentricity of the gear set for speed reduction is insufficient, which is easy to generate shaking noise during driving, affecting the stability of operation. In addition, under the requirement of high reduction ratio, the hub set will also become larger and heavier, increasing the load on the rider;

[0004] In other words, the existing wheel hub drive structure has problems such as insufficient resistance and insufficient concentricity due to its imperfect structural design, which causes problems such as dynamic loss and noise. Under the requirement of high reduction ratio, it occupies a large area and is easy to be damaged, so there is still room for improvement.

[0005] In view of the above-mentioned shortcomings and needs, the present application develops a wheel hub drive structure to overcome the existing troubles and inconveniences caused by the above-mentioned problems. [Summary of the invention]

[0006] Therefore, the main purpose of the present invention is to provide a wheel hub drive structure, whereby the stator of the motor is fixed on the wheel hub shaft through the inner cover, so that when the motor is powered on to activate the rotor to drive the wheel shell, a stable resistance can be obtained, effectively improving the initial driving force of the wheel hub, thereby reducing unnecessary dynamic loss.

[0007] The second main purpose of the present invention is to provide a wheel hub driving structure, which can effectively ensure the concentricity of the wheel hub gear set, improve its operating stability, reduce the problem of vibration and noise, and further reduce the size of the wheel hub through the gear set.

[0008] Based on this, the present invention mainly achieves the above-mentioned purpose and its effect through the following technical means, which include:

[0009] a hub shaft;

[0010] A wheel shell, which is composed of a first hub shell and a second hub shell which can cover each other and are respectively arranged at two ends of the hub shaft;

[0011] A motor unit, which has an inner cover body, the outer edge of one side of the inner cover body is pivotally arranged on the inner edge of the first hub shell of the wheel shell, and the inner cover body axis forms a shaft tube arm that can be fixed on the wheel hub shaft, and the inner edge of the inner cover body is fixedly arranged with an internal gear ring, and the motor unit is pivotally sleeved with an output shaft sleeve on the shaft tube arm of the inner cover body, and the motor unit is respectively provided with a stator and a rotor opposite to each other at the inner edge of the inner cover body and the outer edge of the output shaft sleeve, and one end of the output shaft sleeve has a shaft seat step and a wheel seat step with a smaller diameter, wherein the shaft seat step can be used to relatively pivotally arrange the gear set described later by using a third bearing, and the wheel seat step is used to fix and drive the gear set;

[0012] A gear set is arranged on the output shaft sleeve of the motor set, the gear set has at least one planetary gear set with an outer edge synchronously meshing with the inner gear ring of the inner cover, so that the gear set can provide a required reduction ratio, and one side of the gear set is correspondingly supported on the third bearing of the output shaft sleeve, so that the gear set can run coaxially with the motor set, and the outer edge of the gear set is arranged on the inner edge of the second hub shell of the wheel shell by an inner rotating one-way bearing, so that the motor set can drive the wheel shell to rotate in a forward direction in one direction after the gear set is reduced in speed;

[0013] An external rotation input group has an input shaft sleeve, which is pivotally arranged on the outer side of the wheel shell of the hub shaft, and the input shaft sleeve can be correspondingly arranged on the wheel shell by using an external rotation one-way bearing, so that the input shaft sleeve can drive the wheel shell to rotate in a forward direction in a one-way manner by external manpower.

[0014] Thereby, the wheel hub drive structure of the present invention can greatly improve its practicability and achieve its economic benefits.

[0015] The present invention further achieves the aforementioned objectives and effects by using the following technical means:

[0016] Preferably, the hub shaft periphery has a convex tooth section composed of a plurality of axial racks, and the inner periphery of the shaft tube arm has an inner hole convex tooth section corresponding to the convex tooth section, so that the inner cover body can be fixed on the hub shaft by means of the shaft tube arm.

[0017] Preferably, a first bearing is provided between the inner cover and the inner edge of the first hub shell of the wheel shell, and the hub shaft is pivotally sleeved with an output shaft sleeve on the shaft tube arm of the inner cover by means of a plurality of second bearings, so that the output shaft sleeve and the wheel shell can freely rotate concentrically relative to the inner cover.

[0018] Preferably, the first and second hub shells of the wheel shell respectively have a locking portion that can be relatively combined, and both side edges of the outer periphery of at least one of the first and second hub shells respectively have spoke mounting portions for assembling bicycle wheel rim spokes.

[0019] Preferably, the inner edge of the second hub shell of the wheel shell has a bearing mounting portion corresponding to the inner rotating one-way bearing, and the axis of the second hub shell has an axial protrusion for the internal gear set to be mounted on the outer edge, and the inner edge of the axial protrusion can be used to lock the outer rotating one-way bearing of the outer rotating input group.

[0020] Preferably, the input sleeve of the external rotation input group has a convex tooth joint portion composed of a plurality of axial racks at one end corresponding to the wheel shell, for relative engagement of the external rotation one-way bearing.

[0021] Preferably, the gear set includes a first planetary gear set and a second planetary gear set, the first planetary gear set having a first sun gear arranged on the wheel seat stage of the output shaft sleeve, and a plurality of first planetary gears are meshed around the periphery of the first sun gear, and each of the first planetary gears is pivoted on a first planetary gear carrier, and each of the first planetary gears pivoted on the first planetary gear carrier is synchronously meshed with the inner gear ring, and the second planetary gear set has a second sun gear arranged on the first planetary gear carrier, the second sun gear can be pivoted on the hub shaft by a bearing, and a plurality of second planetary gears are meshed around the periphery of the second sun gear, and each of the second planetary gears is pivoted on one side of a second planetary gear carrier, and each of the second planetary gears is pivoted on the second planetary gear carrier is synchronously meshed with the inner gear ring.

[0022] Preferably, the inner edge of the second planetary wheel carrier is pivotally mounted on the wheel housing by a fourth bearing, so that the gear set can be acted upon by the motor set to run coaxially in the wheel housing.

[0023] Preferably, the first planetary gear carrier of the first planetary gear set has a mounting gear hole formed on the axis of one side surface of the second planetary gear set, and the second sun gear of the second planetary gear set has a mounting gear ring corresponding to the mounting gear hole.

[0024] Preferably, the wheel hub drive structure can be arranged on a frame, the wheel hub shaft has a central hole with an axis extending therethrough, and one end of the wheel hub shaft is provided with an electrical connector and a first mounting block for providing power to the motor group, and the other end of the wheel hub shaft is locked with a clamping nut for pressing the external input group, and a second mounting block is formed on the outer side of the clamping nut, and the frame has two opposite fork rods, and the opposite surfaces of the fork rods are respectively formed with a mounting groove with an outward opening, and the mounting grooves on both sides have a relative through hole, so that the wheel hub drive structure can embed the first and second mounting blocks at both ends of the wheel hub shaft into the relative mounting grooves, and cooperate with a quick-release shaft rod to pass through the central hole of the wheel hub shaft to be fixed between the fork rods on both sides of the frame.

[0025] The preferred embodiments of the present invention are given below and described in detail with reference to the drawings, so that those familiar with the technical field can implement them.

Brief Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the three-dimensional appearance of the wheel hub drive structure of the present invention.

[0027] Figure 2 It is a three-dimensional appearance schematic diagram of the wheel hub drive structure of the present invention from another viewing angle.

[0028] Figure 3 The figure is a three-dimensional exploded schematic diagram of the wheel hub drive structure of the present invention, which is used to illustrate the state of its main components and their relative relationships.

[0029] Figure 4 It is a three-dimensional exploded schematic diagram of the gear set in the wheel hub drive structure of the present invention.

[0030] Figure 5 It is a three-dimensional exploded schematic diagram of the inward-rotating one-way bearing in the wheel hub drive structure of the present invention.

[0031] Figure 6 The figure is a side cross-sectional schematic diagram of the wheel hub drive structure of the present invention, which is used to illustrate the relative relationship between its main components during assembly.

[0032] Figure 7 It is a schematic end view of the cross-sectional view of the wheel hub drive structure of the present invention taken along the A-A section line in the sixth figure.

[0033] Figure 8 It is a schematic end view of the cross-section line B-B in the sixth figure of the wheel hub drive structure of the present invention.

[0034] Fig. 9 The schematic diagram of the end view of the wheel hub drive structure of the present invention along the C-C section line in the sixth figure is provided to illustrate the state of the electric power output transmission of the inner rotating one-way bearing.

[0035] Fig.10The schematic cross-sectional view of the wheel hub drive structure of the present invention taken along the C-C section line in FIG. 6 is provided to illustrate the state of the human output idling of the inner rotating one-way bearing.

[0036] Fig.11 It is a partial three-dimensional exploded schematic diagram of the hub drive structure of the present invention applied to an electric power-assisted bicycle frame.

[0037] Fig.12 It is a partial three-dimensional appearance schematic diagram of the hub drive structure of the present invention applied to an electric power-assisted bicycle frame.

[0038] Fig.13 It is a partial side cross-sectional schematic diagram of the hub drive structure of the present invention applied to an electric power-assisted bicycle frame. 10: Hub axle 11: convex tooth segment 12: Center hole 15: Electrical connector 151: Connector 16: First installation block 18: Locking nut 19: Second mounting block 20: Motor group 21: Inner cover 211: First bearing 22: Axle tube arm 221: Inner hole convex tooth section 23: Internal gear ring 231: First key bar 26: Stator 27: Rotor 28: Output sleeve 280: Second bearing 281: Axle Seat Class 282: Wheel Seat Class 285: Third bearing 300: Gear set 30: First planetary gear set 31: First sun gear 32: First planetary carrier 33: First planetary gear 330: First shaft 34: Install the tooth hole 40: Second planetary gear set 41: Second sun gear 410: Install the gear ring 415: Bearing 42: Second planetary carrier 43: Second planetary gear 430: Second shaft 45: Fourth bearing 50: Inner rotation one-way bearing 511: Second key bar 60: External transfer input group 61: Input sleeve 610: Fifth bearing 62: convex tooth joint 65: External one-way bearing 70: Wheel housing 71: First hub shell 72: Spoke installation part 73: Locking part 74: Sixth bearing 75: Second hub shell 76: Locking part 77: Axis convex part 78: Bearing installation part 80: Frame 85:Fork rod 86: Install the bezel 88:Piercing 90: Quick release shaft [Specific implementation method]

[0039] The present invention is a wheel hub drive structure. In the specific embodiments of the present invention and its components illustrated in the accompanying drawings, all references to front and rear, left and right, top and bottom, upper and lower, and horizontal and vertical are only used for convenience of description and are not intended to limit the present invention or its components to any position or spatial direction. The dimensions specified in the drawings and the description may be changed according to the design and requirements of the present invention without departing from the scope of the patent application of the present invention.

[0040] The hub drive structure of the present invention is used to drive an electric power-assisted bicycle or electric vehicle, such as Figure 1 , 2 As shown in FIG. 3 , a motor set 20, a gear set 300, an external rotation input set 60 and a wheel shell 70 are disposed on a hub shaft 10;

[0041] For the detailed structure of the preferred embodiment of the hub drive structure, please refer to Figure 3 , 4As shown in FIGS. 5 and 6, the two ends of the hub shaft 10 can be used to be fixed on a frame 80 of the electric-assisted bicycle or the electric vehicle [as shown in FIGS. 11-13], and the motor group 20, the gear group 300, the external rotation input group 60 and the wheel shell 70 are coaxially arranged to drive a wheel body [not shown in the figure] arranged on the wheel shell 70, and the periphery of the hub shaft 10 has a convex tooth section 11 composed of a plurality of axial racks for fixing the motor group 20, and the hub shaft 10 has a central hole 12 with an extended axis for matching a quick-release shaft rod 90 to be locked on the frame 80;

[0042] The motor unit 20 has a cup-shaped inner cover 21, and the inner cover 21 is pivotally mounted on the inner edge of the wheel shell 70 by a first bearing 211 at the outer edge of the closed end, and the inner cover 21 is formed with a shaft tube arm 22 extending toward the open end at the axis of the closed end, and the inner periphery of the shaft tube arm 22 has an inner hole convex tooth section 221 corresponding to the convex tooth section 11 of the aforementioned hub shaft 10, so that the inner cover 21 can be fixed on the hub shaft 10 by the shaft tube arm 22, and the inner edge of the open end of the inner cover 21 is fixed with an inner gear ring 23 by a plurality of first key rods 231, and the inner gear ring 23 can be meshed with the aforementioned gear set 300, and the hub shaft 10 is fixed on the shaft tube arm 22 of the inner cover 21 by a plurality of first key rods 231. The second bearing 280 is pivotally sleeved with an output shaft sleeve 28, so that the output shaft sleeve 28 can rotate freely relative to the shaft tube arm 22, and the motor group 20 is provided with a stator 26 composed of a coil and a rotor 27 composed of a magnet at the inner edge of the inner cover 21 and the outer edge of the output shaft sleeve 28, so that the stator 26 fixed to the inner cover 21 can drive the rotor 27 to drive the output shaft sleeve 28 to rotate at a high speed through electromagnetic induction after power is supplied, and one end of the output shaft sleeve 28 has a shaft seat step 281 and a wheel seat step 282 with a smaller diameter, wherein the shaft seat step 281 can be provided to cooperate with a third bearing 285 to pivot relative to the aforementioned gear set 300, and the wheel seat step 282 is used to assemble and drive the gear set 300;

[0043] The gear set 300 is disposed at one end of the output shaft sleeve 28 of the motor set 20, and the gear set 300 includes a first planetary gear set 30 and a second planetary gear set 40, wherein the first planetary gear set 30 has a first sun gear 31 disposed on the wheel seat stage 282 of the output shaft sleeve 28, and the first sun gear 31 is surrounded by a plurality of first planetary gears 33 (such as Figure 7 As shown in FIG. 1 , each of the first planetary gears 33 is pivotally mounted on a first planetary gear carrier 32 by a first shaft 330, and each of the first planetary gears 33 pivotally mounted on the first planetary gear carrier 32 is synchronously meshed with the inner gear ring 23 of the inner housing 21 as shown in FIG. Figure 7As shown, the first sun gear 31 can drive the first planetary gear carrier 32 to rotate through the first planetary gears 33, and the first planetary gear carrier 32 is also arranged on the third bearing 285 corresponding to the output shaft sleeve 28, so that the first planetary gear set 30 can rotate coaxially with the motor set 20. In addition, the first planetary gear carrier 32 is formed with a mounting gear hole 34 on the surface of a side different from the motor set 20, which is used to install the second planetary gear set 40. The second planetary gear set 40 has a second sun gear 41 arranged on the first planetary gear carrier 32, wherein the second sun gear 41 has a mounting gear ring 410 corresponding to the mounting gear hole 34 of the first planetary gear carrier 32, and the second sun gear 41 can be pivotally arranged on the hub shaft 10 by means of a bearing 415, and the second sun gear 41 is surrounded by a plurality of second planetary gears 43 meshing around the periphery thereof. Figure 8 As shown, each of the second planetary gears 43 is pivoted to one side of a second planetary gear carrier 42 by a second shaft 430, and each of the second planetary gears 43 pivoted to the second planetary gear carrier 42 is synchronously meshed with the inner gear ring 23 of the inner housing 21. Figure 8 As shown in FIG. 1 , the second sun gear 41 can drive the second planetary gear carrier 42 to rotate through the second planetary gears 43, and the inner edge of the second planetary gear carrier 42 is pivotally mounted on the aforementioned wheel housing 70 by a fourth bearing 45, and the gear set 300 formed by the first planetary gear set 30 and the second planetary gear set 40 can rotate coaxially with the motor set 20. An inner rotating one-way bearing 50 is provided on the outer edge of the second planetary gear carrier 42, wherein the outer edge of the inner rotating one-way bearing 50 is fixed to the inner edge of the wheel housing 70 by a plurality of second key rods 511 [as shown in FIG. 1 ]. Figure 6 , 9 As shown, the motor group 20 inside can drive the wheel housing 70 to rotate in the forward direction of the electric-assisted bicycle after being decelerated by the gear group 300, and in the opposite direction, it is in an idling state;

[0044] Furthermore, the external rotation input assembly 60 is pivotally mounted on the hub shaft 10 by an input sleeve 61 using a plurality of fifth bearings 610, and the input sleeve 61 has a convex tooth joint 62 composed of a plurality of axial racks at one end corresponding to the wheel shell 70, for engaging with an external rotation one-way bearing 65 that can be correspondingly assembled on the wheel shell 70, so that the wheel shell 70 can be driven by external manpower through the input sleeve 61 in a one-way direction to rotate in the forward direction of the electric assisted bicycle, and otherwise it is in an idle state. Furthermore, a locking nut 18 is locked at the end of the hub shaft 10 on the outer side of the fifth bearing 610 (such as Figure 6 As shown in FIG. 1 , the external rotation input assembly 60 is locked and limited on the hub shaft 10, and a second mounting block 19 is formed on the outer side of the locking nut 18 for locking the hub shaft 10 on the frame 80;

[0045] As for the wheel shell 70, it is composed of a first hub shell 71 and a second hub shell 75 located on both sides of the hub shaft 10 and can be relatively covered, and the first and second hub shells 71, 75 respectively have a locking portion 73, 76 that can be relatively combined. The locking portions 73, 76 can be relatively internal and external threaded sections or screw holes and bolts for protecting and supporting the motor group 20 and the gear group 300. In addition, the outer periphery of at least one of the first and second hub shells 71, 75 has a spoke mounting portion 72 for assembling the spokes of the bicycle rim, and the axis of the first hub shell 71 is pivoted on a connector 151 fixed to the hub shaft 10 by a sixth bearing 74, so that the first hub shell 71 can be The hub shaft 10 rotates relative to the hub shaft 10, and the end of the hub shaft 10 is provided with an electrical connector 15 connected to the connector 151, and the outer end surface of the electrical connector 15 is provided with a first mounting block 16 for assembly on the vehicle frame 80, and the electrical connector 15 is used to provide power to the motor group 20 in the wheel shell 70, and the inner edge of the second hub shell 75 has a bearing mounting portion 78 corresponding to the inner rotation one-way bearing 50 of the aforementioned gear set 300, and the axis of the second hub shell 75 further has an axial protrusion 77 for the fourth bearing 45 of the aforementioned gear set 300 to be mounted on the outer edge, and the inner edge of the axial protrusion 77 can be locked with the outer rotation one-way bearing 65 of the aforementioned outer rotation input set 60;

[0046] Thereby, a wheel hub driving structure is formed which can provide an initial driving resistance and has high concentricity.

[0047] As for the actual operation of the wheel hub drive structure of the present invention, as shown in 11 to Fig.13 As shown, the hub shaft 10 is fixedly arranged between the two fork rods 85 of the wheel of the frame 80 of the electric bicycle or the electric vehicle by a quick release shaft rod 90, and the electrical connector 15 of the hub shaft 10 can be used to connect the controller (not shown in the figure), and the external rotation input group 60 on the hub shaft 10 is used to set the sprocket (not shown in the figure), and the opposite surfaces of the fork rods 85 on both sides of the frame 80 are respectively formed with an outwardly open mounting groove 86, and the mounting grooves 86 on both sides have a relative through hole 88, so that the hub drive structure can be embedded in the relative installation grooves 86 of the fork rods 85 on both sides of the frame 80 through the outer sides of the electrical connectors 15 of the hub shaft 10 and the first and second installation inserts 16 and 19 on the locking nut 18, and cooperate with the quick release shaft 90 to pass through the through hole 88 of the fork rod 85 on one side, the center hole 12 of the hub shaft 10 and the through hole 88 of the fork rod 85 on the other side, so that the hub drive structure can be quickly fixed between the fork rods 85 on both sides of the frame 80;

[0048] In operation, when the electric power is needed to drive the bicycle, Figure 6-10As shown, the electric power is introduced into the motor group 20, so that the stator 26 fixed to the inner housing 21 of the motor group 20 electromagnetically induces the rotor 27 arranged on the output shaft sleeve 28, so that the rotor 27 of the motor group 20 drives the output shaft sleeve 28 to rotate at a high speed, and as shown in FIG. Figure 7 As shown, the output shaft sleeve 28 drives the first sun gear 31 of the first planetary gear set 30 of the gear set 300 to rotate in the counterclockwise direction of the forward direction of the electric-assisted bicycle, thereby driving the first planetary gears 33 of the first planetary gear set 30 to rotate in the clockwise direction. Since the first planetary gears 33 are synchronously meshed with the inner edge of the inner gear ring 2323 fixed to the inner cover 21, the first planetary gear carrier 32 can be driven to rotate in the counterclockwise direction at a reduced speed through the gear ratio of the first sun gear 31 and the first planetary gears 33;

[0049] Then as Figure 8 As shown, since the second sun gear 41 of the second planetary gear set 40 is fixed on the aforementioned first planetary gear carrier 32, the second sun gear 41 also rotates synchronously in the counterclockwise direction, thereby driving the second planetary gears 43 of the second planetary gear set 40 to rotate clockwise. Since the second planetary gears 43 are synchronously meshed with the inner edge of the inner gear ring 2323 fixed on the inner cover body 21, the second planetary gear carrier 42 can be driven to rotate in the counterclockwise direction at a reduced speed through the gear ratio of the second sun gear 41 and the second planetary gears 43. At the same time, as shown in FIG. 9, the inner rotating one-way bearing 50 provided on the second planetary gear carrier 42 is further driven to drive the second hub shell 75 of the wheel shell 70, so that the wheel shell 70 can rotate in the counterclockwise direction to achieve the purpose of driving the electric power-assisted bicycle forward. At this time, the outer rotating one-way bearing 65 between the second hub shell 75 and the input shaft sleeve 61 is in an idling state, which can avoid the conflict between the human power and the transmission force of the motor set 20.

[0050] Furthermore, when the electric-assisted bicycle needs to be driven by manpower, the sprocket (not shown) on the input shaft sleeve 61 of the external rotation input group 60 can be driven by the chain directly by pedaling the crank. The input shaft sleeve 61 can drive the second hub shell 75 to rotate in the forward direction of the electric-assisted bicycle through the external rotation one-way bearing 65, so that the wheel shell 70 can rotate forward, thereby achieving the purpose of driving the electric-assisted bicycle forward by manpower. At this time, the inner rotation one-way bearing 50 between the second hub shell 75 and the second planetary wheel carrier 42 of the second planetary gear set 40 is in an idling state. Fig.10 As shown in FIG. 1 , the transmission force of the motor group 20 and the human power can be prevented from conflicting with each other.

[0051] Through the above-mentioned design and description, the inner cover 21 of the motor group 20 in the wheel hub drive structure of the present invention can be fixed on the wheel hub shaft 10 by using the shaft tube arm 22, so that when the motor is energized to activate the rotor 27 to drive the wheel shell 70, a stable resistance can be obtained, which effectively improves the initial driving force of the wheel hub and reduces unnecessary dynamic loss. At the same time, the second planetary gear set 40 is coaxially arranged with the first planetary gear set 30, and the rotor 27 of the motor group 20 and the first planetary gear set 30 of the gear set 300 can be coaxially arranged on the output shaft sleeve 28, and the output shaft sleeve 28 and the wheel shell 70 can rotate freely and concentrically relative to the inner cover 21, and can effectively ensure concentricity, thereby improving its operation stability, reducing the phenomenon of jitter noise, and further reducing the volume of the wheel hub through the gear set 300.

Claims

1. A wheel hub drive structure, characterized in that: It includes: a hub shaft; A wheel shell, which is composed of a first hub shell and a second hub shell which can cover each other and are respectively arranged at two ends of the hub shaft; A motor unit, which has an inner cover body, the outer edge of one side of the inner cover body is pivotally arranged on the inner edge of the first hub shell of the wheel shell, and the inner cover body axis forms a shaft tube arm that can be fixed on the wheel hub shaft, and the inner edge of the inner cover body is fixed with an internal gear ring, and the motor unit is pivotally sleeved with an output shaft sleeve on the shaft tube arm of the inner cover body, and the motor unit is respectively provided with a stator and a rotor opposite to each other at the inner edge of the inner cover body and the outer edge of the output shaft sleeve, and one end of the output shaft sleeve has a shaft seat step and a wheel seat step, wherein the shaft seat step can be used to relatively pivotally arrange the gear set described later by using a third bearing, and the wheel seat step is used to fix and drive the gear set; A gear set is arranged on the output shaft sleeve of the motor set, the gear set has at least one planetary gear set with an outer edge synchronously meshing with the inner gear ring of the inner cover, so that the gear set can provide a required reduction ratio, and one side of the gear set is correspondingly supported on the third bearing of the output shaft sleeve, so that the gear set can run coaxially with the motor set, and the gear set is arranged on the inner edge of the second hub shell of the wheel shell by an inner rotation one-way bearing, so that the motor set can drive the wheel shell to rotate in a forward direction in one direction after the gear set is reduced in speed; An external rotation input group has an input shaft sleeve, which is pivotally arranged on the outer side of the wheel shell of the hub shaft, and the input shaft sleeve can be correspondingly arranged on the wheel shell by using an external rotation one-way bearing, so that the input shaft sleeve can drive the wheel shell to rotate in a forward direction in a one-way manner by external manpower.

2. A wheel hub drive structure as claimed in claim 1, characterized in that: The hub shaft periphery has a convex tooth section composed of a plurality of axial racks, and the inner periphery of the shaft tube arm has an inner hole convex tooth section corresponding to the convex tooth section, so that the inner cover body can be fixed on the hub shaft by means of the shaft tube arm.

3. A wheel hub drive structure as claimed in claim 1, characterized in that: A first bearing is arranged between the inner cover and the inner edge of the first hub shell of the wheel shell, and the hub shaft is pivotally sleeved with the output shaft sleeve on the shaft tube arm of the inner cover by means of a plurality of second bearings, so that the output shaft sleeve and the wheel shell can freely rotate coaxially relative to the inner cover.

4. A wheel hub drive structure as claimed in claim 1, characterized in that: The first and second hub shells of the wheel shell are respectively provided with a locking portion that can be relatively combined, and both side edges of the outer periphery of at least one of the first and second hub shells are respectively provided with a spoke mounting portion for assembling the spokes of the bicycle wheel rim.

5. A wheel hub drive structure as claimed in claim 4, characterized in that: The inner edge of the second hub shell of the wheel shell has a bearing mounting portion corresponding to the inner rotating one-way bearing, and the axis of the second hub shell has an axial protrusion for the internal gear set to be mounted on the outer edge, and the inner edge of the axial protrusion can be used to lock the outer rotating one-way bearing of the outer rotating input group.

6. A wheel hub drive structure as claimed in claim 1, characterized in that: The input shaft sleeve of the external rotation input group has a convex tooth joint portion composed of a plurality of axial racks at one end corresponding to the wheel shell, so as to provide relative meshing for the external rotation one-way bearing.

7. A wheel hub drive structure as claimed in claim 1, characterized in that: The gear set includes a first planetary gear set and a second planetary gear set, the first planetary gear set having a first sun gear arranged on the wheel seat stage of the output shaft sleeve, and a plurality of first planetary gears are meshed around the periphery of the first sun gear, and each of the first planetary gears is pivoted on a first planetary gear carrier, and each of the first planetary gears pivoted on the first planetary gear carrier is synchronously meshed with the inner gear ring, and the second planetary gear set has a second sun gear arranged on the first planetary gear carrier, the second sun gear can be pivoted on the hub shaft by a bearing, and a plurality of second planetary gears are meshed around the periphery of the second sun gear, and each of the second planetary gears is pivoted on one side of a second planetary gear carrier, and each of the second planetary gears is pivoted on the second planetary gear carrier is synchronously meshed with the inner gear ring.

8. A wheel hub drive structure as claimed in claim 7, characterized in that: The inner edge of the second planetary wheel frame is pivotally mounted on the wheel housing by a fourth bearing, so that the gear set can be acted upon by the motor set to run coaxially in the wheel housing.

9. A wheel hub drive structure as claimed in claim 7, characterized in that: The first planetary gear carrier of the first planetary gear set is formed with a mounting gear hole on the axis of a surface of one side of the second planetary gear set, and the second sun gear of the second planetary gear set has a mounting gear ring corresponding to the mounting gear hole.

10. A wheel hub drive structure according to any one of claims 1 to 9, characterized in that: The wheel hub drive structure can be arranged on a frame, the wheel hub shaft has a central hole with an axis extending therefrom, and one end of the wheel hub shaft is provided with an electrical connector and a first mounting block for providing power to the motor group, and the other end of the wheel hub shaft is locked with a clamping nut for pressing the external input group, and a second mounting block is formed on the outer side of the clamping nut, and the frame has two opposite fork rods, and the opposite surfaces of the fork rods are respectively formed with a mounting groove with an outward opening, and the mounting grooves on both sides have a relative through hole, so that the wheel hub drive structure can embed the first and second mounting blocks at both ends of the wheel hub shaft into the relative mounting grooves, and cooperate with a quick-release shaft rod to pass through the central hole of the wheel hub shaft to be fixed between the fork rods on both sides of the frame.

11. A wheel hub drive structure as claimed in claim 10, characterized in that: The electrical connector and the first mounting insert can be integrally mounted on the hub shaft, while the locking nut and the second mounting insert can be two-pieces respectively mounted on the hub shaft.

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