Hub driving structure

Abstract

The utility model relates to a wheel hub driving structure, which is characterized in that a motor set, a gear set, an external rotation input set and a wheel shell are arranged on a wheel hub shaft, 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 propping 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 utility model belongs to a wheel hub technical field of electric vehicle, more particularly refers to a wheel hub drive structure with drive motor, in order to let the stator of motor can pass through inner cover body and be fixed on wheel hub shaft, make motor when driving the wheel shell of rotor, obtain stable resistance, to effectively improve its initial driving force, reduce unnecessary dynamic loss. BACKGROUND

[0002] In recent years, in the bicycle aspect, the electric power-assisted bicycle application that the drive force generated by motor to assist human force has been extremely common, the electric power-assisted bicycle mainly uses the pedaling power of riding to obtain the forward power by the power provided by a power output mechanism (such as a wheel hub motor), which does not cause too much burden on the rider. The wheel hub motor of the foregoing electric power-assisted bicycle is divided into an inner rotor type and an outer rotor type. The inner rotor type wheel hub motor has the advantages of small rotational inertia and easy driving because the stator is arranged on the outer side close to the wheel hub shell, and the rotor is arranged on the inner side close to the wheel hub shaft, and the coil heat energy is also easy to dissipate outward.

[0003] There are various inner rotor type wheel hub motors applied to electric power-assisted bicycles in the prior art, such as the wheel hub with a built-in motor for a bicycle disclosed in Patent No. I455850, the electric drive wheel hub unit of a vehicle and the vehicle comprising the unit disclosed in Patent No. I680908, and the inner rotor type wheel motor disclosed in Patent No. I770780. The design of the foregoing wheel hub motor causes the motor to be unable to obtain effective resistance when driven by electricity due to the instability of the orientation of the stator, resulting in unnecessary dynamic loss and reducing the initial driving force of the wheel hub. Meanwhile, the insufficient concentricity of the speed-reducing gear set easily causes shaking noise during driving, affecting the stability of operation. In addition, under the requirement of high reduction ratio, the wheel hub set becomes larger and heavier, increasing the load on the rider.

[0004] In other words, the existing wheel hub drive structure has the problems of insufficient resistance and insufficient concentricity due to imperfect structural design, causing dynamic loss and noise, and under the requirement of high reduction ratio, the structure is large and 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 problems caused by the foregoing problems. CONTENT OF THE UTILITY MODEL

[0006] Therefore, the main purpose of the utility model is to provide a wheel hub drive structure, so that the stator of the motor is fixed on the wheel hub shaft through the inner cover body, so that the motor can obtain stable resistance when driving the rotor, effectively improve the initial driving force of the wheel hub, and further reduce unnecessary dynamic loss.

[0007] The utility model discloses a wheel hub drive structure, it can effectively ensure the concentricity of the gear set of wheel hub, can improve its running stability, to reduce the problem of shaking noise, further and can reduce the volume of wheel hub through the gear set.

[0008] Therefore, the utility model mainly through the following technical means to realize the preceding purpose and its efficacy, it contains:

[0009] A wheel hub shaft;

[0010] A wheel shell, it is composed of the first hub shell and the second hub shell that can be relatively closed and are arranged on both ends of the wheel hub shaft;

[0011] A motor set, it has an inner cover body, the inner cover body one side outer edge is pivoted in the first hub shell inner edge of the wheel shell, and the inner cover body axle center forms a axle pipe arm that can be fixed on the wheel hub shaft, furthermore the inner cover body inner edge is fixed with an inner tooth ring, furthermore the motor set is pivoted on the axle pipe arm of the inner cover body with an output shaft sleeve, and the motor set is arranged with opposite stator and rotor on the inner cover body inner edge and the output shaft sleeve outer edge, and the output shaft sleeve one end has an axle seat step and a smaller diameter wheel seat step, wherein the axle seat step can be used to pivot the gear set described below with a third bearing, and the wheel seat step is used to fixedly arrange and drive the gear set;

[0012] A gear set, it is arranged on the output shaft sleeve of the motor set, the gear set has at least one outer edge synchronous meshing the planetary gear set of the inner tooth ring of the inner cover body, so that the gear set can provide the required speed reduction ratio, and one side of the gear set is supported on the third bearing of the output shaft sleeve, so that the gear set can rotate 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 using an inner rotating one-way bearing, so that the motor set can drive the wheel shell to rotate in the forward direction by the gear set;

[0013] An outer rotating input set, it has an input shaft sleeve, the input shaft sleeve is pivoted on the outer side of the wheel hub shaft, and the input shaft sleeve can be correspondingly arranged on the wheel shell by using an outer rotating one-way bearing, so that the input shaft sleeve can be unidirectionally driven by external manpower to rotate the wheel shell in the forward direction.

[0014] Therefore, the utility model wheel hub drive structure can greatly improve its practicability, and can realize its economic benefit.

[0015] And the utility model further realizes the preceding purpose and efficacy by using the following technical means; such as:

[0016] Preferably, the hub shaft has a plurality of axial splines on the outer periphery of the hub shaft, and the inner periphery of the axle tube arm has a plurality of axial splines corresponding to the plurality of axial splines on the hub shaft, so that the inner cover can be fixedly engaged with the hub shaft by the axle tube arm.

[0017] Preferably, the inner cover and the inner periphery of the first hub shell of the wheel shell have a first bearing therebetween, and the hub shaft has a plurality of second bearings on the axle tube arm of the inner cover, so that the output shaft sleeve is freely rotatable with respect to the inner cover and the wheel shell.

[0018] Preferably, the first and second hub shells of the wheel shell have a lockable engagement portion therebetween, and the outer periphery of at least one of the first and second hub shells has a rim mounting portion for mounting a bicycle rim.

[0019] Preferably, the inner periphery of the second hub shell of the wheel shell has a bearing mounting portion corresponding to the inner rotating one-way bearing, and the axial center of the second hub shell has an axial protrusion on the outer periphery for mounting the gear set, and the inner periphery of the axial protrusion is lockable for the outer rotating one-way bearing of the outer rotating input set.

[0020] Preferably, the input shaft sleeve of the outer rotating input set has a plurality of axial splines on one end corresponding to the wheel shell for engaging the outer rotating one-way bearing.

[0021] Preferably, the gear set comprises a first planetary gear set and a second planetary gear set, the first planetary gear set has a first sun gear mounted on the step of the wheel seat of the output shaft sleeve, and the first sun gear has a plurality of first planetary gears engaged therearound, and each of the first planetary gears is pivotally mounted on a first planetary gear carrier, and each of the first planetary gears pivotally mounted on the first planetary gear carrier is engaged with the inner ring, and the second planetary gear set has a second sun gear mounted on the first planetary gear carrier, and the second sun gear is pivotally mounted on the hub shaft by a bearing, and the second sun gear has a plurality of second planetary gears engaged therearound, and each of the second planetary gears is pivotally mounted on one side of a second planetary gear carrier, and each of the second planetary gears pivotally mounted on the second planetary gear carrier is engaged with the inner ring.

[0022] Preferably, the inner periphery of the second planetary gear carrier is pivotally mounted on the wheel shell by a fourth bearing, so that the gear set can be coaxially rotated by the motor set in the wheel shell.

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

[0024] Preferably, the hub driving structure can be provided on a frame, the hub shaft has a central hole with axis extending, and the hub shaft has an electrical connector and a first mounting block provided at one end of the hub shaft, and a pressing nut provided at the other end of the hub shaft to press the outer rotating input group, and the pressing nut has a second mounting block formed outside, and the frame has two opposite fork rods, the opposite surfaces of the fork rods have a mounting slot with outward opening respectively, and the two mounting slots have a relative through hole respectively, so that the hub driving structure can be embedded in the opposite mounting slots through the first and second mounting blocks at both ends of the hub shaft, and a quick release shaft is provided through the central hole of the hub shaft and fixed between the two fork rods of the frame.

[0025] Preferably, the electrical connector and the first mounting block are integrally provided on the hub shaft, and the pressing nut and the second mounting block are separately provided on the hub shaft.

[0026] The preferred embodiments of the utility model are described in detail below with reference to the drawings, and those skilled in the art can understand the specific implementation.

DRAWINGS

[0027] Figure 1 It is a perspective view of the hub driving structure of the utility model.

[0028] Figure 2 It is a perspective view of the hub driving structure of the utility model from another angle.

[0029] Figure 3 It is a perspective exploded view of the hub driving structure of the utility model, which shows the state of the main components and their relative relationship.

[0030] Figure 4 It is a perspective exploded view of the gear group in the hub driving structure of the utility model.

[0031] Figure 5 It is a perspective exploded view of the inner rotating one-way bearing in the hub driving structure of the utility model.

[0032] Figure 6 It is a side view of the hub driving structure of the utility model, which shows the relative relationship of the main components when they are assembled.

[0033] Figure 7 It is an end view of the hub driving structure of the utility model along the A-A section line in the sixth drawing.

[0034] Figure 8 It is an end view of the hub driving structure of the utility model along the B-B section line in the sixth drawing.

[0035] Figure 9 It is the end view section schematic view of the hub driving structure of the utility model in the sixth drawing C-C section line, for explaining the state of the electric power-assisted output transmission of the inner rotation one-way bearing.

[0036] Figure 10 It is another end view section schematic view of the hub driving structure of the utility model in the sixth drawing C-C section line, for explaining the state of the manual output idling of the inner rotation one-way bearing.

[0037] Figure 11 It is the partial three-dimensional exploded schematic view of the hub driving structure of the utility model applied to the electric power-assisted bicycle frame.

[0038] Figure 12 It is the partial three-dimensional appearance schematic view of the hub driving structure of the utility model applied to the electric power-assisted bicycle frame.

[0039] Figure 13 It is the partial side view section schematic view of the hub driving structure of the utility model applied to the electric power-assisted bicycle frame.

[0040] 10: hub shaft

[0041] 11: convex tooth section

[0042] 12: center hole

[0043] 15: electrical connector

[0044] 151: coupling

[0045] 16: first installation insert block

[0046] 18: gland nut

[0047] 19: second installation insert block

[0048] 20: motor set

[0049] 21: inner cover body

[0050] 211: first bearing

[0051] 22: shaft pipe arm

[0052] 221: inner hole convex tooth section

[0053] 23: inner tooth ring

[0054] 231: first key rod

[0055] 26: stator

[0056] 27: rotor

[0057] 28: output shaft sleeve

[0058] 280: second bearing

[0059] 281: Axle Seat Class

[0060] 282: Wheel Seat Class

[0061] 285: Third Bearing

[0062] 300: Gear Set

[0063] 30: First planetary gear set

[0064] 31: First Sun Wheel

[0065] 32: First planetary gear carrier

[0066] 33: First Planetary Wheel

[0067] 330: First shaft

[0068] 34: Install toothed holes

[0069] 40: Second planetary gear set

[0070] 41: Second Sun Wheel

[0071] 410: Install the gear ring

[0072] 415: Bearing

[0073] 42: Second planetary gear carrier

[0074] 43: Second Planetary Wheel

[0075] 430: Second shaft

[0076] 45: Fourth Bearing

[0077] 50: Internal unidirectional bearing

[0078] 511: Second key lever

[0079] 60: External Input Group

[0080] 61: Input shaft sleeve

[0081] 610: Fifth Bearing

[0082] 62: Teeth joint

[0083] 65: External unidirectional bearing

[0084] 70: Wheel housing

[0085] 71: First hub shell

[0086] 72: Spoke installation section

[0087] 73: Locking part

[0088] 74: sixth bearing

[0089] 75: second hub shell

[0090] 76: locking portion

[0091] 77: shaft protrusion

[0092] 78: bearing mounting portion

[0093] 80: frame

[0094] 85: fork rod

[0095] 86: mounting slot

[0096] 88: perforation

[0097] 90: quick release shaft rod

DETAILED DESCRIPTION

[0098] The wheel hub driving structure of the present application, along with the specific embodiments and components of the present application as illustrated in the accompanying drawings, all references to front and back, left and right, top and bottom, upper and lower, and horizontal and vertical are for the convenience of description only, and are not intended to limit the present application, nor are the components intended to be limited to any position or spatial orientation. The dimensions specified in the drawings and the specification can be varied as needed in accordance with the design and requirements of the present application without departing from the scope of the present application.

[0099] The wheel hub driving structure of the present application is applied to drive an electrically assisted bicycle or an electric vehicle, as shown in Figure 1 、 2 , 3, which comprises a motor set 20, a gear set 300, an external input set 60, and a wheel shell 70 arranged on a wheel hub shaft 10.

[0100] The detailed structure of the preferred embodiment of the wheel hub driving structure is shown in Figure 3 、 4 , 5, 6, wherein the wheel hub shaft 10 has two ends that can be fixed to a frame 80 of the electrically assisted bicycle or the electric vehicle [as shown in Figures 11-13], and the motor set 20, the gear set 300, the external input set 60, and the wheel shell 70 are coaxially arranged to drive a wheel body [not shown in the figure] arranged in the wheel shell 70, and the wheel hub shaft 10 has a protruding tooth segment 11 composed of a plurality of axial gear racks for fixing the motor set 20, and the wheel hub shaft 10 has a central hole 12 extending along the axis for locking a quick release shaft rod 90 to the frame 80.

[0101] The motor set 20 has a cup-shaped inner cover 21, which is pivotally arranged on the inner edge of the wheel shell 70 by a first bearing 211 on the outer edge of the closed end. The inner cover 21 has a shaft tube arm 22 extending from the shaft center of the closed end to the open end. The inner periphery of the shaft tube arm 22 has an inner hole tooth segment 221 corresponding to the tooth segment 11 of the hub shaft 10, so that the inner cover 21 can be fixed on the hub shaft 10 by the shaft tube arm 22. The inner periphery of the open end of the inner cover 21 is fixed with an inner tooth ring 23 by a plurality of first key rods 231. The inner tooth ring 23 is engaged with the gear set 300. The hub shaft 10 has an output shaft sleeve 28 pivotally sleeved on the shaft tube arm 22 of the inner cover 21 by a plurality of second bearings 280, so that the output shaft sleeve 28 can rotate freely relative to the shaft tube arm 22. The inner periphery of the inner cover 21 and the outer periphery of the output shaft sleeve 28 are respectively provided with a stator 26 composed of a coil and a rotor 27 composed of a magnet. After being energized, the stator 26 fixed on the inner cover 21 can drive the rotor 27 to rotate at high speed by electromagnetic induction, and the output shaft sleeve 28 has a shaft seat step 281 and a smaller diameter wheel seat step 282 on one end. The shaft seat step 281 is pivotally connected to the gear set 300 by a third bearing 285, and the wheel seat step 282 is used to assemble and drive the gear set 300.

[0102] The gear set 300 is arranged on one end of the output shaft sleeve 28 of the motor set 20. The gear set 300 includes a first planetary gear set 30 and a second planetary gear set 40. The first planetary gear set 30 has a first sun gear 31 arranged on the wheel seat step 282 of the output shaft sleeve 28. The first sun gear 31 has a plurality of first planetary gears 33 (as shown in Figure 7 The first planetary gears 33 are respectively pivotally arranged on a first planetary gear carrier 32 by a first shaft rod 330. The first planetary gears 33 pivotally arranged on the first planetary gear carrier 32 are synchronously engaged with the inner tooth ring 23 of the inner cover 21 (as shown in Figure 7As shown, the first sun gear 31 can drive the first planetary gear carrier 32 through the first planetary gears 33, and the first planetary gear carrier 32 is mounted 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 assembly 20. The first planetary gear carrier 32 has a mounting tooth hole 34 formed on the side of its axis opposite to the motor assembly 20 for mounting the second planetary gear set 40. The second planetary gear set 40 has a second sun gear 41 mounted on the first planetary gear carrier 32, wherein the second sun gear 41 has a mounting ring 410 corresponding to the mounting tooth hole 34 of the first planetary gear carrier 32. The second sun gear 41 can be pivotally mounted on the hub shaft 10 using a bearing 415, and a plurality of second planetary gears 43 are meshed around the periphery of the second sun gear 41 (e.g., ...). Figure 8 As shown in the figure, each of the second planetary gears 43 is pivotally mounted on one side of a second planetary gear carrier 42 via a second shaft 430, and each of the second planetary gears 43 pivotally mounted on the second planetary gear carrier 42 simultaneously meshes with the internal gear ring 23 of the aforementioned inner cover 21 (as shown in the figure). Figure 8 As shown, the second sun gear 41 can drive the second planetary gear carrier 42 through the second planetary gears 43, and the inner edge of the second planetary gear carrier 42 is pivotally mounted on the aforementioned gear housing 70 by a fourth bearing 45. This further allows the gear set 300, formed by the first planetary gear set 30 and the second planetary gear set 40, to rotate coaxially with the motor assembly 20. An inner one-way bearing 50 is provided on the outer edge of the second planetary gear carrier 42, and the outer edge of the inner one-way bearing 50 is fixed to the inner edge of the gear housing 70 by a plurality of second key rods 511 (as shown in the figure). Figure 6 , 9 As shown, the internal motor assembly 20, after being reduced in speed by the gear set 300, can drive the wheel housing 70 to rotate in the forward direction of the electric-assisted bicycle in one direction, and in the opposite direction, it will idle.

[0103] Furthermore, the external input assembly 60 is pivotally mounted on the hub shaft 10 via an input bushing 61 using a plurality of fifth bearings 610. The input bushing 61 has a toothed engagement portion 62 formed by a plurality of axial racks at one end corresponding to the wheel housing 70, for engaging with an external one-way bearing 65 correspondingly mounted on the wheel housing 70. This allows external human power to drive the wheel housing 70 to rotate in the forward direction of the electric bicycle via the input bushing 61, otherwise it will idle. A tightening nut (18) is locked on the outside of the fifth bearing 610 at the end of the hub shaft 10. Figure 6 As shown, the external input group 60 is locked and limited to the hub shaft 10, and a second mounting insert 19 is formed on the outside of the clamping nut (18) for locking the hub shaft 10 to the frame 80.

[0104] The wheel housing 70 is composed of a first hub housing 71 and a second hub housing 75 located on both sides of the hub axle 10 and capable of overlapping each other. The first and second hub housings 71 and 75 each have a locking portion 73 and 76 that can be engaged with each other. These locking portions 73 and 76 can be opposing internal and external threaded sections or threaded holes and bolts, providing protection and support for the motor assembly 20 and the gear set 300. Furthermore, at least one of the first and second hub housings 71 and 75 has a spoke mounting portion 72 on both sides of its outer periphery for assembling bicycle rim spokes. The first hub housing 71 is pivotally mounted on a connector 151 fixed to the hub axle 10 via a sixth bearing 74, allowing the first hub housing 71 to... The wheel hub 10 rotates relative to the hub shaft 10, and the end of the hub shaft 10 is provided with an electrical connector 15 that connects to the connector 151. The outward end face of the electrical connector 15 has a first mounting insert 16 for assembly on the frame 80. The electrical connector 15 provides power to the motor assembly 20 inside the wheel housing 70. The inner edge of the second hub housing 75 has a bearing mounting part 78 corresponding to the inner one-way bearing 50 of the aforementioned gear set 300. The second hub housing 75 further has a shaft protrusion 77 for the fourth bearing 45 of the aforementioned gear set 300 to be mounted on the outer edge. The inner edge of the shaft protrusion 77 can be locked with the outer one-way bearing 65 of the aforementioned outer input set 60.

[0105] This allows for the creation of a hub drive structure that provides initial driving resistance and high concentricity.

[0106] As for the actual operation of the hub drive structure of this utility model, it is as follows: 11~ Figure 13 As shown, the hub axle 10 is fixed between the two forks 85 of the wheel of the electric bicycle or electric vehicle frame 80 via a quick-release axle 90. An electrical connector 15 of the hub axle 10 can be used to connect to a controller (not shown). The external rotation input group 60 on the hub axle 10 is used to mount a sprocket (not shown). The opposing surfaces of the two forks 85 of the frame 80 each have an outwardly opening mounting groove 86, and each mounting groove 86 has a corresponding through hole 88, allowing the hub drive structure to connect to the outer side of the electrical connector 15 at both ends of the hub axle 10. The first and second mounting inserts 16 and 19 on the tightening nut 18 are embedded in the corresponding mounting slots 86 of the two side forks 85 of the frame 80, and cooperate with the quick-release shaft 90 to pass through the through hole 88 of one side fork 85, the center hole 12 of the wheel hub shaft 10 and the through hole 88 of the other side fork 85, so that the wheel hub drive structure can be quickly fixed between the two side forks 85 of the frame 80; wherein the electrical connector 15 and the first mounting insert 16 are locked together as an integral part of the wheel hub shaft 10, while the tightening nut 18 and the second mounting insert 19 are locked separately as two parts of the wheel hub shaft 10.

[0107] Operationally, when the electric power is needed to drive the bicycle, as shown in Figures 6-10 the power is introduced into the motor set 20, the stator 26 fixed to the inner cover 21 of the motor set 20 is electromagnetically induced to the rotor 27 provided in the output shaft sleeve 28, the rotor 27 of the motor set 20 drives the output shaft sleeve 28 to rotate at high speed, and as shown in Figure 7 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 opposite to the forward direction of the electric power-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 engaged with the inner edge of the inner tooth 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 between the first sun gear 31 and the first planetary gears 33.

[0108] Then, as shown in Figure 8 the second sun gear 41 of the second planetary gear set 40 is fixed to the first planetary gear carrier 32, so that the second sun gear 41 also synchronously rotates in the counterclockwise direction, thereby driving the second planetary gears 43 of the second planetary gear set 40 to rotate in the clockwise direction. Since the second planetary gears 43 are synchronously engaged with the inner edge of the inner tooth ring 2323 fixed to the inner cover 21, the second planetary gear carrier 42 can be driven to rotate in the counterclockwise direction at a reduced speed through the gear ratio between the second sun gear 41 and the second planetary gears 43, and as shown in the ninth drawing, further drives the inner rotating one-way bearing 50 provided in the second planetary gear carrier 42 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 to move forward, and 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 idle state, which can avoid the conflict between the transmission power of the motor set 20 and the human power.

[0109] Further, when the human power is needed to drive the electric power-assisted bicycle, the chain wheel [not shown in the drawing] provided in the input shaft sleeve 61 of the outer rotating input set 60 can be directly driven by pedaling the crank to drive the input shaft sleeve 61 to rotate in the forward direction of the electric power-assisted bicycle through the outer rotating one-way bearing 65, so that the wheel shell 70 can rotate forward to achieve the purpose of driving the electric power-assisted bicycle to move forward by human power, and at this time, the inner rotating one-way bearing 50 between the second hub shell 75 and the second planetary gear carrier 42 of the second planetary gear set 40 is in an idle state [as shown in Figure 10 ], which can avoid the conflict between the transmission power of the motor set 20 and the human power.

[0110] Through the foregoing design and description, the inner cover body 21 of the motor set 20 in the hub driving structure can be fixed on the hub shaft 10 by the shaft pipe arm 22, so that the motor can obtain stable resistance when driving the wheel shell 70 by energizing the rotor 27, effectively improving the driving force of the hub at the beginning, thereby reducing unnecessary dynamic loss. Meanwhile, the second planetary gear set 40 is coaxially arranged with the first planetary gear set 30, and the rotor 27 of the motor set 20 and the first planetary gear set 30 of the gear set 300 can be coaxially arranged on the output shaft sleeve 28. The output shaft sleeve 28 and the wheel shell 70 can freely rotate concentrically relative to the inner cover body 21, which can effectively ensure the concentricity, thereby improving the stability of operation, reducing the phenomenon of shaking noise, and further reducing the volume of the hub through the gear set 300.

Claims

1. A hub drive structure, characterized by, It comprises: a hub shaft; a wheel shell composed of a first hub shell and a second hub shell which can be closed relative to each other and are respectively arranged at both ends of the hub shaft; a motor set having an inner cover body, one side outer edge of which is pivotally arranged in the inner edge of the first hub shell of the wheel shell, and the axis of the inner cover body forms an axle tube arm which can be fixed on the hub shaft, and an inner ring is fixed on the inner edge of the inner cover body, and the motor set pivotally sleeves an output shaft sleeve on the axle tube arm of the inner cover body, and the motor set is respectively arranged with a stator and a rotor on 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 an axle seat step and a wheel seat step, wherein the axle seat step can be pivotally arranged with a third bearing relative to the gear set described below, and the wheel seat step is used for fixing and driving the gear set; a gear set arranged on the output shaft sleeve of the motor set, the gear set has at least one planetary gear set which synchronously engages the inner ring of the inner cover body, so that the gear set can provide the required reduction ratio, and one side of the gear set corresponds to the third bearing supported on the output shaft sleeve, so that the gear set can operate coaxially with the motor set, and the gear set is arranged in the inner edge of the second hub shell of the wheel shell by using an inner rotating one-way bearing, so that the motor set can drive the wheel shell to rotate in the forward direction by the gear set; an outer rotating input set having an input shaft sleeve, the input shaft sleeve 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 outer rotating one-way bearing, so that the input shaft sleeve can be unidirectionally driven by external manpower to rotate the wheel shell in the forward direction.

2. The hub drive structure of claim 1, wherein Wherein the outer edge of the hub shaft has a convex tooth segment composed of a plurality of axial splines, and the inner circumferential edge of the axle tube arm has an inner hole convex tooth segment corresponding to the convex tooth segment, so that the inner cover body can be fixed on the hub shaft by engaging the axle tube arm.

3. The hub drive structure of claim 1, wherein Wherein a first bearing is arranged between the inner edge of the first hub shell of the inner cover body and the wheel shell, and a plurality of second bearings are pivotally sleeved on the output shaft sleeve on the axle tube arm of the inner cover body, so that the output shaft sleeve and the wheel shell can freely rotate concentrically relative to the inner cover body.

4. The hub drive structure of claim 1, wherein Wherein the first and second hub shells of the wheel shell respectively have a locking part which can be combined relative to each other, and the outer circumferential edge of at least one of the first and second hub shells respectively has a width strip mounting part for assembling a bicycle rim width strip.

5. The hub drive structure of claim 1, wherein Wherein the inner edge of the second hub shell of the wheel shell has a bearing mounting part corresponding to the inner rotating one-way bearing, and the axis of the second hub shell has an axis protruding part for mounting the outer edge of the gear set, and the inner edge of the axis protruding part can lock the outer rotating one-way bearing of the outer rotating input set.

6. The hub drive structure of claim 1, wherein Wherein the input shaft sleeve of the outer rotating input set has a convex tooth combination part composed of a plurality of axial splines corresponding to one end of the wheel shell, for relative engagement of the outer rotating one-way bearing.

7. The hub drive structure of claim 1, wherein The gear set comprises a first planetary gear set and a second planetary gear set. The first planetary gear set has a first sun gear arranged on the wheel seat step of the output shaft sleeve. The first sun gear is surrounded by a plurality of first planetary gears. Each of the first planetary gears is pivotally arranged on a first planetary gear carrier. Each of the first planetary gears pivotally arranged on the first planetary gear carrier is synchronously engaged with the inner ring. The second planetary gear set has a second sun gear arranged on the first planetary gear carrier. The second sun gear is pivotally arranged on the hub shaft by a bearing. The second sun gear is surrounded by a plurality of second planetary gears. Each of the second planetary gears is pivotally arranged on one side of a second planetary gear carrier. Each of the second planetary gears pivotally arranged on the second planetary gear carrier is synchronously engaged with the inner ring.

8. The hub drive structure of claim 7, wherein The inner edge of the second planetary gear carrier is pivotally arranged on the wheel housing by a fourth bearing. The gear set can be coaxially rotated in the wheel housing by the motor set.

9. The hub drive structure of claim 7, wherein The first planetary gear carrier of the first planetary gear set has a mounting tooth hole formed on the side surface axis of the second planetary gear set. The second sun gear of the second planetary gear set has a mounting tooth ring corresponding to the mounting tooth hole.

10. The hub drive structure according to any one of claims 1 to 9, wherein The hub drive structure can be arranged on a frame. The hub shaft has a central hole with an axis extending. The hub shaft has an electrical connector and a first mounting block arranged on one end of the hub shaft. The hub shaft has a compression nut arranged on the other end of the hub shaft. The compression nut is locked to compress the outer rotating input set. The compression nut has a second mounting block arranged on the outside of the compression nut. The frame has two opposite fork rods. The two opposite fork rods have two mounting grooves with outward openings arranged on the opposite surfaces. The two mounting grooves have two opposite through holes. The hub drive structure can be inserted into the two opposite mounting grooves through the first and second mounting blocks arranged on the two ends of the hub shaft. A quick release shaft is arranged through the central hole of the hub shaft and is fixed between the two fork rods of the frame.

11. The hub drive structure of claim 10, wherein, The electrical connector and the first mounting block are integrally arranged on the hub shaft. The compression nut and the second mounting block are separately arranged on the hub shaft.

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