TWM632545U - Rear-driven electric power assist vehicle hub - Google Patents

Abstract

A rear-drive electric auxiliary wheel hub includes a hub shell, an electric drive unit, a first inner gear ring, a hub cover unit and a ratchet cylinder unit. The hub cover unit includes a first ring base, a ring disc, and a plurality of first pawl groups arranged on the first ring base. Each first pawl set has a first elastic piece, and a first pawl piece that is bounced by the respective first elastic piece to engage with the first inner toothed ring. When the electric drive unit drives the first inner toothed ring to rotate, the first claws engage the first inner toothed ring, and through the first claws drive the first ring seat and the ring disc to move the When the hub shell rotates, when the ratchet cylinder unit drives the ring plate and the first ring seat and drives the hub shell to rotate, each first claw is pressed against the respective first claw by the reaction force of the first inner gear ring. An elastic member enables the hub shell to rotate relative to the first inner gear ring.

Description

Rear drive electric auxiliary wheel hub

The present invention relates to an electric auxiliary wheel hub, in particular to a rear-drive electric auxiliary wheel hub.

Referring to Fig. 1, a kind of existing roller bicycle hub 9, comprises a mandrel 91, a sleeve 92 that rotatably surrounds this mandrel 91 and can be driven by an electric motor (not shown), a sleeve 92 that surrounds this sleeve A clutch ring 93 of the cylinder 92, and a hub member 94 surrounding the clutch ring 93.

The clutch ring 93 has an inner ring portion 931 rotatably surrounding the sleeve 92, a plurality of slots 932 formed in the inner ring portion 931 at angular intervals, and an outer ring portion 933 opposite to the inner ring portion 931. , a plurality of grooves 934 formed on the inner peripheral surface of the outer ring part 933 at angular intervals, and a plurality of grooves 934 arranged between the inner ring part 931 and the outer ring part 933 and corresponding in number to the equal wear grooves 932 and the outer ring part 933 respectively. The clutch group 935 of the groove 934.

Each clutch assembly 935 has a roller 936 partially accommodated in the slot 932 , and an elastic piece 937 that bounces against the respective roller 936 clockwise in FIG. 1 .

When the electric motor is powered and drives the sleeve 92 to rotate along the spindle 91 When the hour hand rotates, the rollers 936 are stuck between the sleeve 92 and the outer ring portion 933, so that the sleeve 92 can drive the clutch ring 93 to rotate through the rollers 936, and the clutch ring 93 drives the clutch ring 93 to rotate. Hub member 94 rotates and advances the bicycle.

And when this electric motor stops receiving power supply, and this bicycle moves backwards and makes this flower hub member 94 drive this clutch ring 93 to rotate counterclockwise relative to this arbor 91, each roller 936 extrudes respectively this shrapnel 937 and moves toward respective The groove 934 moves so that the rollers 936 are not locked between the sleeve 92 and the outer ring portion 933 , and the hub member 94 can rotate relative to the sleeve 92 .

However, the rollers 936 of the roller bicycle hub 9 are prone to wear due to friction with the outer ring portion 933 and the sleeve 92 for a long time, causing the sleeve 92 to drive the hub member 94 to rotate and slip Cause the problem of unsmooth transmission.

Therefore, the purpose of the present invention is to provide a rear-drive electric auxiliary wheel hub that can improve the aforementioned shortcomings.

Therefore, the new rear-drive electric auxiliary wheel hub is suitable for installing on a bicycle in cooperation with a torque sensing device of an electric auxiliary bicycle. The rear-drive electric auxiliary wheel hub includes a hub shell, an electric drive unit, a first inner A gear ring, a hub cover unit, and a ratchet cylinder unit.

The hub shell has an accommodating space. The electric driving unit is arranged in the accommodating space. The first inner gear ring is arranged on one side of the electric drive unit along an axial direction and can be supported by the The electric drive unit is driven to rotate around an axis extending along the axial direction. The hub cover unit includes a first ring seat located in the first inner gear ring and surrounding the axis, a ring plate connected to the side of the first ring seat opposite to the electric drive unit and covered on the hub shell , a plurality of first pawl groups arranged at angular intervals on the first ring base. Each first pawl set has a first elastic member disposed on the first ring seat, and a first elastic member rotatably arranged on the first ring seat and resiliently radially outwardly resisted by the respective first elastic member. to engage with the first claw of the first inner gear ring. The ratchet cylinder unit is arranged on the side of the ring disc opposite to the electric drive unit and can drive the ring disc and the first ring seat in a forward rotation direction around the axis to drive the hub shell to rotate around the axis. When the drive unit drives the first internal gear to rotate around the axis in the forward rotation direction, the first claws engage the first internal gear ring, and the first internal gear drives the first internal gear through the first claws. The ring seat and the ring disc and the hub shell are rotated around the axis in the normal direction. A first pawl is pressed radially inwards against the respective first elastic parts by the reaction force of the first inner gear ring, so that the hub shell can rotate around the first inner gear ring in the forward direction relative to the first inner gear ring. Axis rotation.

The effect of the present invention is that: through the clutch structure of the first inner gear ring and the first pawl groups, when the electric drive unit drives the first inner gear ring to rotate, the first inner gear ring can pass through the meshing The first claws drive the hub shell to rotate in the forward rotation direction, and when the ratchet cylinder rotates, the first claws retract respectively into the first slots, so that the hub shell can be moved relative to the The first internal gear ring rotates.

1: hub shell

11:Accommodating space

2: Electric drive unit

21: motor

22: Drive inner gear ring

23: sun gear

24: Planetary gear

25: gear plate

26: Mandrel

3: The first internal gear ring

4: Hub cover unit

41: The first ring seat

411: first side

412: second side

413: outer ring surface

414: inner ring surface

415: First piercing

416: The first card slot

417: first slot end

42: ring disc

421:Second piercing

422: Internal thread surface

43: The first pawl group

431: the first elastic member

433: The first coil section

434: The first extension

432: First claw piece

435: first head

436: The first ladder tooth part

44: Fixed cover

45: Second internal gear ring

5: Ratchet barrel unit

51: The second ring seat

511: inner peripheral surface

512: Outer peripheral surface

513: abutment surface

514: Second card slot

515: Second slot end

52: spine barrel

53: The second pawl group

531: the second elastic member

533: Second coil section

534: Second extension

532: Second claw

535: second head

536: The second ladder tooth part

6: Sensing unit

61: Sleeve

611: Barrel

613: flat part

614: arc barrel

612: Card arrival

62: Sensor

63: magnetic ring

7: Control unit

71: Power supply

72: Controller

L: axis

X: Axial

Other features and functions of the present model will be clearly presented in the implementation manner with reference to the drawings, wherein: Fig. 1 is a cross-sectional view of an existing roller-type bicycle hub; Fig. 2 is a rear-drive electric auxiliary vehicle of the present invention An embodiment of the wheel hub and a perspective view of the torque sensing device of an electric assisted bicycle installed on a rear wheel frame; Fig. 3 is a three-dimensional exploded view of the embodiment and the torque sensing device of the electric assisted bicycle; Fig. 4 is A motor of this embodiment and a control unit of the torsion sensing device of the electric assisted bicycle, and a block diagram of a sensor; Fig. 5 is a partial enlarged view of Fig. 3; Fig. 6 is another view from Fig. 3 A partial enlarged view viewed from an angle; Fig. 7 is a partial enlarged view of Fig. 3; Fig. 8 is a cross-sectional view of the embodiment and the torque sensing device of the electric assisted bicycle; Fig. 9 is along the line IX- in Fig. 8 IX is a sectional view taken; FIG. 10 is a sectional view taken along line X-X in FIG. 8; and FIG. 11 is a sectional view taken along line XI-XI in FIG.

The present model will be described in detail below in conjunction with the accompanying drawings and embodiments. Before the present model is described in detail, it should be noted that the relative position terms used in the following descriptions, for example, "front", "rear", "left", "Right", "Up", and "Down" are based on the directions shown in the drawings and the normal use directions.

Referring to FIG. 2 to FIG. 4 , an embodiment of the rear-drive electric auxiliary wheel hub 100 of the present invention is suitable for a torque sensing device 200 of an electric auxiliary bicycle and installed on a bicycle (not shown). The torque sensing device 200 of the electrically assisted bicycle includes a sensing unit 6 and a control unit 7 . The bicycle includes a vehicle frame (not shown), a rear wheel frame 8, a bicycle gear set (not shown), a crank assembly (not shown), and a The chain of the gear set (not shown).

The rear-drive electric auxiliary wheel hub 100 is suitable for installation on the rear wheel frame 8 and includes a hub shell 1, an electric drive unit 2, a first inner gear ring 3, a hub cover unit 4, and a ratchet cylinder unit 5 .

The hub shell 1 has an accommodating space 11 .

The electric drive unit 2 is arranged in the accommodating space 11, and includes a motor 21 arranged in the accommodating space 11, a driving inner gear ring 22 around an axis L extending along an axial direction X, and a driving ring 22 located in the driving A sun gear 23 in the inner gear ring 22 that can be driven by the motor 21, three planetary gears 24 located between the sun gear 23 and the driving inner gear ring 22 and meshing with the sun gear 23 and the driving inner gear ring 22, - Mounted on the planetary gears On the opposite side of the motor 21 is the gear plate 25 , and a hollow tubular mandrel 26 extending from the gear plate 25 towards the direction opposite to the planetary gear 24 along the axial direction X.

The gear plate 25 and the spindle 26 are fixed and will not rotate. The motor 21 can drive the sun gear 23 to drive the planetary gears 24 to rotate. The planetary gears 24 then drive the driving inner gear ring 22 around the axis L. turn.

The first inner gear ring 3 is disposed on one side of the electric drive unit 2 along the axis X and can be driven by the electric drive unit 2 to rotate around the axis L.

In this embodiment, the first inner gear ring 3 is locked on the side of the driving inner gear ring 22 opposite to the motor 21 along the axis X by a plurality of screws.

Referring to FIG. 3 , FIG. 5 , and FIG. 6 , the hub cover unit 4 includes a first ring base 41 , a ring plate 42 , a plurality of first pawl sets 43 , a fixed cover 44 , and a second inner gear ring 45 .

The first ring seat 41 is located in the first inner gear ring 3 and surrounds the axis L. The first ring seat 41 has a first side 411 extending radially relative to the axis L and surrounding the axis L, and a first side 411 along the axis L. The axial direction X is opposite to the second side surface 412 of the first side surface 411, an outer ring surface 413 extending along the axis X and connected to the second side surface 412, an outer ring surface 413 opposite to the outer ring surface 413 and connected to the The first side 411 defines an inner ring surface 414 of a first through hole 415 around the axis L, and a plurality of first engaging grooves 416 formed at the junction of the outer ring surface 413 and the second side surface 412 .

Each of the first locking slots 416 has a first slot end 417 oppositely disposed along the arc around the axis L and in the shape of an arc.

The ring plate 42 is connected to a side of the first ring base 41 opposite to the electric drive unit 2 and covers the hub shell 1 . And the ring plate 42 surrounds the axis L and defines a second hole 421 communicating with the first hole 415 and accommodating part of the ratchet cylinder unit 5 with the first ring seat 41 . The first side 411 of the first ring base 41 is connected to the ring 42 and the outer ring 413 is connected between the second side 412 and the ring 42 .

The ring disk 42 has an internal thread surface 422 surrounding the second through hole 421 and adjacent to the first side surface 411 of the first ring seat 41 .

The first pawl sets 43 are disposed on the first ring seat 41 at angular intervals and accommodated in the first locking grooves 416 respectively. Each first pawl group 43 has a first elastic member 431 disposed on the first ring seat 41, and a first elastic member 431 rotatably arranged on the first ring seat 41 and supported by the respective first elastic member 431 along the diameter. The first pawl 432 of the first inner gear ring 3 springs outward to engage with it.

In this embodiment, each first claw 432 has a first head 435 rotatably disposed on one of the first groove ends 417 of the respective first locking groove 416, and a first head 435 opposite to the first The head portion 435 tapers toward the first inner gear ring 3 and engages with the first ladder tooth portion 436 of the first inner gear ring 3 .

Each first elastic member 431 is a reed and has a first coil segment 433 disposed on the other first slot end 417 of the first slot 416 respectively, and a coil segment opposite to the first coil segment. 433 and bounce against the respective first extensions 434 of the first ladder teeth 436 .

The fixing cover 44 is locked on the second side 412 of the first ring base 41 through a plurality of screws to limit the first claws 432 and the first elastics 431 to the first slots 416 . Therefore, the first claws 432 and the first elastics 431 are not easy to fall off from the first slots 416 .

The second internal gear ring 45 is screwed to the internal thread surface 422 and surrounds the axis L. As shown in FIG.

Referring to Fig. 6 and Fig. 7, the ratchet cylinder unit 5 is arranged on the opposite side of the ring plate 42 to the electric drive unit 2, and includes a second ring seat 51, a ratchet cylinder 52, and a plurality of second pawl groups 53.

The second ring seat 51 surrounds the axis L and is located inside the second inner toothed ring 45, and has an inner peripheral surface 511 surrounding the axis L, an outer peripheral surface 512 opposite to the inner peripheral surface 511, and an outer peripheral surface 512 connected to the The abutting surface 513 between the inner peripheral surface 511 and the outer peripheral surface 512 and facing the first ring seat 41 , and a plurality of second locking grooves 514 formed at the junction of the outer peripheral surface 512 and the abutting surface 513 . Each of the second locking slots 514 has arc-shaped second slot end portions 515 oppositely disposed along the arc around the axis L. As shown in FIG.

The ratchet barrel 52 is in the shape of a hollow tube and is connected to a side of the second ring base 51 opposite to the electric drive unit 2 for installation of the bicycle gear set.

The second detent sets 53 are disposed on the second ring base 51 at angular intervals and respectively disposed on the second locking grooves 514 . Each second pawl group 53 has a second elastic member 531 disposed on the second ring seat 51, and a second elastic member 531 rotatably arranged on the second ring seat 51 and supported by the respective second elastic member 531 along the diameter. spring outward to engage with the second inner gear ring 45 of the second claw member 532 .

In this embodiment, each second claw member 532 has a second head 535 rotatably disposed on one of the second slot ends 515 of the respective second locking slot 514, and two The head portion 535 tapers toward the second inner gear ring 45 and engages with the second ladder tooth portion 536 of the second inner gear ring 45 . Since the diameter of the second inner gear ring 45 is smaller than the diameter of the first inner gear ring 3, the number of the second ladder teeth 536 in this embodiment is designed to be two to improve the engagement of each second claw 532. The biting strength of the second inner gear ring increases the transmission stability and the service life of the second claws 532 .

Each second elastic member 531 is a reed and has a second coil section 533 disposed on the other second slot end 515 of the second slot 514 respectively, and a second coil section opposite to the second coil section. 533 and bounce against the second extension section 534 of the at least one second ladder tooth portion 536 . It should be noted that, in other variations of this embodiment, the number of the second ladder teeth may also be one or three, and should not be limited thereto.

The second claw members 532 and the second elastic members 531 are restricted in the second engaging grooves 514 by the first side surface 411 of the first ring seat 41 and the second ring seat 51 . Therefore, the second claws 532 and the second elastics 531 are not easy to fall off from the second slots 514 .

Referring to Fig. 2, Fig. 3, Fig. 4, the sensing unit 6 includes a sleeve 61 which is provided with the mandrel 26 and is made of aluminum alloy, and a sensing unit which is arranged on the side of the sleeve 61 opposite to the mandrel 26. Detector 62, and a magnetic ring fixed in the ratchet tube 52 and surrounding the sensor 62 63.

The sleeve 61 has a barrel body 611 surrounding the spindle 26 and for the sensor 62 to be disposed, and a barrel body 611 extending radially outward from an end of the barrel body 611 adjacent to the electric drive unit 2 along the axial direction X. C-shaped locking member 612 that can be limited by the magnetic ring 63 along the axis X.

The cylinder body 611 has a flat plate portion 613 adjacent to the mandrel 26 , a C-shaped arc tube portion with two opposite ends respectively connected to two opposite sides of the flat plate portion 613 and surrounding the mandrel 26 together with the flat plate portion 613 614. The engaging member 612 surrounds the arc tube portion 614 and has two opposite ends protruding relative to the flat plate portion 613 for limiting the sensor 62 .

The control unit 7 is disposed on the vehicle frame and includes a power supply 71 electrically connected to the motor 21 , and a controller 72 electrically connected to the power supply 71 and the motor 21 and connected to the sensor 62 by signal. In this embodiment, the power supply 71 supplies power to the motor 21 through a signal line 81, and the controller 72 is wirelessly connected to the sensor 62 through Bluetooth. The sensor 62 has a Hall sensor The PCB board of the device (not shown). In other variants of this embodiment, the controller 72 can also be connected to the sensor 62 through a transmission line (not shown) for signal, and should not be limited thereto.

The above is the structure and connection relationship between each component of the rear-drive electric auxiliary wheel hub 100 of this embodiment and the bicycle and the torque sensing device 200 of the electric auxiliary bicycle. The actuation relationship between the sensing device 200 and the bicycle.

Referring to FIG. 2 , FIG. 4 , and FIG. 8 to FIG. 11 , when the user does not step on the crank assembly, the ratchet barrel 52 does not rotate, and the power supply 71 does not supply power to the motor 21 .

When the user steps on the crank assembly to make the ratchet tube 52 drive the second ring seat 51 to rotate around the axis L in a forward rotation direction (clockwise in FIG. 9 ), the second inner toothed ring 45 is driven by the When the second claw member 532 is driven, the first ring seat 41 , the ring disc 42 , the hub shell 1 and the rear wheel frame 8 rotate around the axis L in the forward rotation direction to drive the bicycle forward.

When the user does not continue to step on the crank assembly, the ratchet tube 52 and the second ring seat 51 stop rotating and the second inner gear ring 45 continues to rotate in the forward direction, each second pawl 532 is received The force of the second inner gear ring 45 presses the respective second elastic members 531 radially inward, so that the hub shell 1 and the rear wheel frame 8 can move along the positive direction relative to the second inner gear ring 45 . The direction of rotation rotates around the axis L.

And when the hub shell 1 and the first ring seat 41 rotate along the normal rotation direction, each first claw member 432 is pressed radially inward against the respective first claw member 432 by the reaction force of the first inner gear ring 3 The first elastic member 431 (see FIG. 10 ) enables the hub shell 1 and the rear wheel frame 8 to rotate relative to the first inner gear ring 3 around the axis L along the normal rotation direction.

When the ratchet cylinder 52 drives the magnetic ring 63 to rotate relative to the sensor 62 of the sensing unit 6, the sensor 62 will calculate and generate a torque information according to the magnetic field change detected and generated by the Hall sensor sent to the controller 72, when the controller 72 judges that the torque information satisfies a boost condition, the controller 72 will control the power supply 71 to provide Electric to this motor 21, and control this motor 21 to rotate. The torque information is one of the number of rotations of the ratchet cylinder 52, the rotational speed, and the rotational torque.

In this embodiment, the torque information is the number of rotations of the ratchet cylinder 52, and the assisting condition is that the rotation number of the ratchet cylinder 52 in the torque information is greater than a predetermined number of rotations, and the predetermined number of rotations is half a rotation. In other variations of this embodiment, it is also possible to set corresponding assist conditions for different torque information, such as the rotational speed or rotational torque of the ratchet cylinder 52, to control the rotation of the motor 21, and the predetermined number of turns can also be set to be different The number of laps should not be limited to this.

When the motor 21 of the electric drive unit 2 drives the driving inner gear ring 22 to drive the first inner gear ring 3 to rotate around the axis L in the forward rotation direction, the first claws 432 engage the first inner gear Ring 3, the first inner toothed ring 3 drives the first ring seat 41 and the ring disc 42 through the first claws 432 and drives the hub shell 1 and the rear wheel frame 8 around the axis in the forward rotation direction L rotates at a constant rate to provide the user with a boost to step on, so that the bicycle advances at a fixed rate of 25km/hr.

To sum up, the new rear-drive electric auxiliary hub 100, through the clutch structure of the first inner gear ring 3 and the first pawl sets 43, when the electric drive unit 2 drives the first inner gear When the ring 3 rotates, the first inner toothed ring 3 can firmly drive the hub shell 1 and the rear wheel frame 8 to rotate along the normal rotation direction by engaging the first claws 432 to make the bicycle move forward. When the crank assembly drives the ratchet cylinder 52 to rotate, the first claws 432 will retract respectively to the first slots 416, so that the hub shell 1 can rotate relative to the first inner gear ring 3. Drive type electric auxiliary wheel hub 100 is not only simple in structure Pure, and can maintain the stability of the engagement between the first inner gear ring 3 and the first pawl members 432 of the first pawl sets 43 under long-term use, so the purpose of the present invention can indeed be achieved.

But the above-mentioned person is only the embodiment of the present invention, and should not limit the scope of implementation of the present invention with this, and all simple equivalent changes and modifications made according to the patent scope of the present application and the content of the patent specification are still within the scope of the present invention. Within the scope covered by this patent.

100: rear drive electric auxiliary wheel hub

1: hub shell

11:Accommodating space

2: Electric drive unit

21: motor

22: Drive inner gear ring

23: sun gear

24: Planetary gear

25: gear plate

26: mandrel

3: The first internal gear ring

4: Hub cover unit

41: The first ring seat

42: ring disc

43: The first pawl group

44: Fixed cover

45: Second internal gear ring

5: Ratchet barrel unit

51: The second ring seat

511: inner peripheral surface

52: spine barrel

53: The second pawl group

200: Torque Sensing Device for Electric Assisted Bicycles

6: Sensing unit

61: Sleeve

611: Barrel

613: flat part

614: arc barrel

612: Card arrival

62: Sensor

63: magnetic ring

L: axis

X: Axial

Claims (8)

A rear-drive electric auxiliary wheel hub, comprising: a hub shell having an accommodating space; an electric drive unit disposed in the accommodating space; a first inner gear ring disposed in the electric drive unit along an axial direction and can be driven by the electric drive unit to rotate around an axis extending along the axial direction; the hub cover unit includes a first ring seat located in the first inner gear ring and surrounding the axis, a connecting On the side of the first ring seat opposite to the electric drive unit and covered with the ring disc of the hub shell, and a plurality of first pawl groups arranged at angular intervals on the first ring seat, each first ratchet The claw set has a first elastic member arranged on the first ring seat, and a first elastic member which is rotatably arranged on the first ring seat and is pushed radially outward by the respective first elastic members to engage with the first ring seat. A first claw of the inner gear ring; and a ratchet cylinder unit, which is arranged on the side of the ring plate opposite to the electric drive unit and can drive the ring plate and the first ring seat in a forward direction around the axis to Linking the hub shell to rotate around the axis, when the electric drive unit drives the first internal teeth to rotate around the axis in the direction of forward rotation, the first claws engage the first internal gear ring, and the first internal teeth The ring drives the first ring seat and the ring plate through the first claws and drives the hub shell to rotate around the axis in the forward rotation direction. When the ratchet cylinder unit drives the ring plate and the first ring seat and links When the hub shell rotates in the forward rotation direction, each first pawl is pressed radially inward against the respective first elastic piece by the reaction force of the first inner gear ring, so that the hub shell can be moved relative to the The first inner gear ring rotates around the shaft in the normal direction The line turns. The rear-drive electric auxiliary wheel hub according to claim 1, wherein the first ring seat has a first side surface connected to the ring disk and surrounding the axis, and a second side surface opposite to the first side surface along the axial direction. Two side surfaces, an outer annular surface connected between the second side surface and the ring disk, an inner annular surface opposite to the outer annular surface and connected to the first side surface and defining a first through hole around the axis, and a plurality of first engaging grooves formed at the junction of the outer ring surface and the second side and respectively accommodating the first pawl groups, the ring disk surrounds the axis and defines a boundary with the first ring seat A second through hole communicating with the first through hole and accommodating part of the ratchet cylinder unit, the hub cover unit also includes a second side surface arranged on the first ring seat to connect the first claws with the second An elastic member is limited to the fixed covers of the first slots. The rear-drive type electric auxiliary wheel hub according to claim 2, wherein each first clamping groove has two oppositely arranged first groove ends along the arc around the axis, and each first claw has a A first head that is rotatably disposed at one end of the first groove of each first locking groove, and a first head that is opposite to the first head and extends gradually toward the first inner gear ring and engages the first In the first ladder tooth part of an inner gear ring, each first elastic member is a reed and has a first spring coil segment arranged at the end of the other first slot of the respective first slot, and an opposite on the first coil segment and bounce against the respective first extension segments of the first ladder teeth. The rear-drive electric auxiliary wheel hub as claimed in claim 3, wherein the ring has an internal threaded surface surrounding the second hole, and the hub cap unit further includes a threaded surface that is screwed on the internal threaded surface and surrounds the axis The second internal gear ring, the ratchet The cylinder unit includes a second ring seat around the axis and located in the second inner toothed ring, a ratchet cylinder connected to the second ring seat opposite to the electric drive unit, and a plurality of angularly spaced In the second ratchet group of the second ring seat, each second ratchet group has a second elastic member arranged on the second ring seat, and a rotatably arranged on the second ring seat and is controlled by each The second elastic member springs outward in the radial direction to engage with the second claw of the second inner gear ring. When the second ring seat rotates in the forward direction, the second inner gear ring is affected by the Wait for the second claw to drive and move the first ring seat, the ring disc and the hub shell to rotate around the axis in the forward direction, when the ratchet cylinder and the second ring seat stop rotating and the second inner toothed ring When rotating in the forward rotation direction, each second claw is pressed radially inward against the respective second elastic member by the force of the second inner gear ring, so that the hub shell can move relative to the second inner ring. The gear ring rotates around the axis along the normal rotation direction. The rear-drive electric auxiliary wheel hub according to claim 4, wherein the second ring seat has an inner peripheral surface surrounding the axis, an outer peripheral surface opposite to the inner peripheral surface, and a and the abutting surface between the outer peripheral surface and facing the first ring seat, and a plurality of second locking grooves formed at the junction of the outer peripheral surface and the abutting surface and respectively accommodating the second pawl groups , the second claws and the second elastic members are limited in the second slots by the first side of the first ring base and the second ring base, each second slot has two edges along the At the end of the second groove opposite to the arc of the axis, each second claw has a second head that is rotatably arranged at one of the ends of the second groove of the second locking groove, and at least a second ladder tooth part opposite to the second head and tapering toward the second inner gear ring and engaging the second inner gear ring, each second elastic member It is a reed and has a second coil section arranged at the end of another second groove of the second card slot, and a second coil section opposite to the second coil section and springing against the at least one second ladder tooth the second extension of the section. The rear-drive electric auxiliary wheel hub as claimed in claim 5, wherein each second pawl has two second ladder teeth engaging with the second inner gear ring. The rear-drive electric auxiliary wheel hub according to claim 1, wherein the electric drive unit includes a motor disposed in the accommodating space, and a motor that can be driven by the motor to rotate around the axis and connected along the axial direction The drive inner gear ring on the side of the first inner gear ring opposite to the ring disc. The rear-drive electric auxiliary wheel hub as claimed in item 7, wherein the electric drive unit further includes a sun gear located in the driving inner gear ring and driven by the motor, and a plurality of sun gears located between the sun gear and the The sun gear and the planetary gear of the driving inner gear ring are engaged between the driving inner gear ring.

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