Variable speed hub with compact axial structure

Abstract

The invention discloses a variable speed hub with a compact axial structure. The variable speed hub comprises a hub shell, a first-stage driving assembly, a second-stage driving assembly and a third-stage driving assembly, wherein the second-stage driving assembly is connected with the first-stage driving assembly through a second planetary gear set, and the third-stage driving assembly is connected with the second-stage driving assembly through a third planetary gear set. A second spline is arranged on the periphery of a second gear ring of a second planetary gear set of the second-stage driving assembly. A third spline is arranged on the periphery of a third gear ring of a third planetary gear set of the third-stage driving assembly. The second gear ring and the second spline are integrally formed, the third gear ring and the third spline are integrally formed, and the splines are located on the peripheries of the gear rings. The centrifugal block of the second clutch assembly of the second-stage driving assembly and the centrifugal block of the third clutch assembly of the third-stage driving assembly are distributed on the same annular track. Compared with the prior art, the axial space occupied by the variable-speed hub can be effectively saved, and integration of the variable-speed hub and the motor is facilitated.

Description

Technical Field

[0001] The invention relates to a non-motor vehicle, and in particular to a speed change device. Background Art

[0002] The patent document with application publication number CN 116495093 A discloses a variable speed hub, which includes a hub shell, a first-stage drive assembly, a second-stage drive assembly and a third-stage drive assembly. The first-stage drive assembly directly drives the hub shell through a first claw ratchet. The second-stage drive assembly includes a second clutch and a second spline, the second clutch is fixed to the hub shell through a second claw ratchet and rotates with it to achieve power transmission, and the second claw ratchet is located on the outer peripheral side of the second spline. The third-stage drive assembly includes a third clutch and a third spline, the third clutch is fixed to the hub shell through a third claw ratchet and rotates with it to achieve power transmission, and the third claw ratchet is located on the outer peripheral side of the third spline.

[0003] The driving body rotates under the drive of the flywheel or other external force, and under the action of centrifugal force, the first claw opens and couples with the gear ring (fixed on the inner wall of the hub shell), so that the rotating driving body drives the hub shell to rotate. Since the hub shell is connected to the wheel, the hub shell moves with the wheel.

[0004] When the hub shell is in the first speed stage, the second claw and the second spline are in a decoupled state, the third claw and the third spline are in a decoupled state, the first claw and the gear ring are coupled, the second spline is idle, and the third spline is idle.

[0005] When the hub shell reaches the second speed, the speed of the hub shell is greater than the speed of the driving body, the speed of the gear ring fixedly connected to the hub shell is greater than the speed of the first pawl, the first pawl is in an overtaking state, and the first pawl has no driving effect on the hub. As the speed of the hub shell increases, under the action of centrifugal force, the second centrifugal block following the hub shell rotates radially, driving the second clutch plate to rotate a certain angle, and the second pawl originally restricted by the second clutch plate can rotate toward the center of rotation and couple with the second spline. At this time, the power is transmitted to the driving body, the gear ring of the second planetary gear set, the second spline, the second pawl, and the hub shell. At this time, the third pawl and the third spline are in a decoupled state, and the third spline is idling.

[0006] When the hub shell reaches the third speed, the speed of the second pawl ratchet following the hub shell is greater than the speed of the second spline, and the second pawl ratchet is in an overtaking state. At this time, the first pawl ratchet is of course in an overtaking state, and the first pawl ratchet and the second pawl ratchet have no driving effect on the hub. As the speed of the hub shell increases, under the action of centrifugal force, the third centrifugal block following the hub shell rotates radially, driving the third clutch plate to rotate a certain angle, and the third pawl ratchet originally restricted by the third clutch plate can rotate toward the rotation center and couple with the third spline. At this time, the power transmission is the driving body, the ring gear of the second planetary gear set, the planetary carrier of the third planetary gear set, the ring gear of the third planetary gear set, the third spline, the third pawl ratchet, and the hub shell.

[0007] When the rotation speed of the hub shell is higher than the third rotation speed, the first pawl ratchet, the second pawl ratchet and the third pawl ratchet are all in an overrunning state.

[0008] The gear ring of the second planetary gear set is provided with an axial extension structure, on which a fourth spline is provided, the fourth spline is an external spline, and the fourth spline cooperates with the internal spline of the second spline to achieve power transmission. The fourth spline is axially arranged in parallel with the gear ring of the second planetary gear assembly, occupying a longer axial space.

[0009] The gear ring of the third planetary gear set is provided with an axial extension structure, on which a sixth spline is provided, the sixth spline is an external spline, and the sixth spline cooperates with the internal spline of the third spline to achieve power transmission. The sixth spline is axially arranged in parallel with the gear ring of the third planetary gear assembly, occupying a longer axial space.

[0010] In order to realize electric drive, the speed hub needs to be integrated with the motor on the same hub shaft. However, the fourth spline is axially arranged in parallel with the gear ring of the second planetary gear assembly, and the sixth spline is axially arranged in parallel with the gear ring of the third planetary gear assembly, which occupies a long axial space and is not conducive to the integration of the speed hub and the motor on the same hub shaft. Summary of the invention

[0011] The technical problem solved by the present invention is that the fourth spline is axially parallel to the gear ring of the second planetary gear assembly, and the sixth spline is axially parallel to the gear ring of the third planetary gear assembly, which occupies a longer axial space and is not conducive to integrating the speed hub and the motor on the same hub shaft.

[0012] In order to solve the above technical problems, the present invention provides the following technical solutions: a variable speed hub with a compact axial structure, comprising a hub shell pivotally connected to a hub shaft, a first-stage drive assembly pivotally connected to the hub shaft, a second-stage drive assembly connected to the first-stage drive assembly via a second planetary gear set, and a third-stage drive assembly connected to the second-stage drive assembly via a third planetary gear set;

[0013] The first-stage driving assembly includes a driving body and a first claw ratchet arranged on the driving body, wherein the first claw ratchet can directly drive the hub shell;

[0014] The second stage driving assembly includes a second clutch assembly, the second clutch assembly is located between the hub shell and the second gear ring of the second planetary gear set, the second clutch assembly is fixedly connected to the hub shell and can be clutched with the second gear ring; a second spline is provided on the periphery of the second gear ring, and the second clutch assembly is provided with a second pawl ratchet capable of unidirectionally driving the second spline;

[0015] The third stage driving assembly includes a third clutch assembly, the third clutch assembly is located between the hub shell and the third gear ring of the third planetary gear set, the third clutch assembly is fixedly connected to the hub shell and can be clutched with the third gear ring; the periphery of the third gear ring is provided with a third spline, and the third clutch assembly is provided with a third pawl ratchet capable of unidirectionally driving the third spline;

[0016] The second gear ring and the second spline are integrally formed, and the second spline is located at the periphery of the inner teeth of the second gear ring; the third gear ring and the third spline are integrally formed, and the third spline is located at the periphery of the inner teeth of the third gear ring.

[0017] The driving body is pivotally connected to the hub shaft and the hub shell. The driving body rotates under the drive of the flywheel or other external force. Under the action of centrifugal force, the first claw opens and couples with the first gear ring (fixed on the inner wall of the hub shell). In this way, the rotating driving body drives the hub shell to rotate. Since the hub shell is connected to the wheel, the hub shell moves with the wheel.

[0018] When the hub shell is in the first speed stage, the second claw and the second spline are in a decoupled state, the third claw and the third spline are in a decoupled state, the first claw and the gear ring are coupled, the second spline is idle, and the third spline is idle.

[0019] When the hub shell reaches the second speed, the speed of the hub shell is greater than the speed of the driving body, the speed of the gear ring fixedly connected to the hub shell is greater than the speed of the first pawl, the first pawl is in an overrunning state, and the first pawl has no driving effect on the hub. As the speed of the hub shell increases, under the action of centrifugal force, the second clutch assembly that follows the hub shell moves, causing the second pawl to couple with the second spline. At this time, the power is transmitted to the driving body, the second gear ring, the second spline, the second pawl, and the hub shell. At this time, the third pawl and the third spline are in a decoupled state, and the third spline is idling.

[0020] When the hub shell reaches the third speed, the speed of the second pawl ratchet following the hub shell is greater than the speed of the second spline, and the second pawl ratchet is in an overtaking state. At this time, the first pawl ratchet is of course in an overtaking state, and the first pawl ratchet and the second pawl ratchet have no driving effect on the hub. As the speed of the hub shell increases, under the action of centrifugal force, the third clutch assembly following the hub shell moves, so that the third pawl ratchet is coupled with the third spline. At this time, the power is transmitted to the driving body, the second gear ring, the planetary carrier of the third planetary gear set, the third gear ring, the third spline, the third pawl ratchet, and the hub shell.

[0021] When the rotation speed of the hub shell is higher than the third rotation speed, the first pawl ratchet, the second pawl ratchet and the third pawl ratchet are all in an overrunning state.

[0022] Compared with the prior art, the second gear ring of the present invention is integrally formed with the second spline, and the second spline is radially arranged inside and outside the second gear ring, rather than being axially distributed; the third gear ring is integrally formed with the third spline, and the third spline is radially arranged inside and outside the third gear ring, rather than being axially distributed. In this way, the axial space occupied by the speed hub can be effectively saved.

[0023] The driving body is fixedly connected to the second planetary carrier of the second planetary gear set, or the driving body and the second planetary carrier of the second planetary gear set are designed as an integrated whole; the second gear ring of the second planetary gear set is linked to the third planetary carrier of the third planetary gear set. The driving body can be driven by a flywheel or directly by a motor. The driving body drives the second gear ring through the second planetary gear set, and the second gear ring drives the hub shell to rotate through the second spline and the second claw ratchet to increase the speed. The second gear ring drives the third gear ring through the third planetary gear set, and the third gear ring drives the hub shell to rotate through the third spline and the third claw ratchet to increase the speed.

[0024] The second clutch assembly includes a second clutch base fixedly connected to the hub shell, a second clutch plate movably engaged on the second clutch base, a second centrifugal block movably engaged with the second clutch base through a second torsion spring, a second pawl is rotatably connected to the second clutch base, the second centrifugal block is movably engaged with the second clutch plate, and the radial swing of the second centrifugal block can drive the second clutch plate to displace and cause the second pawl to clutch the second spline.

[0025] The third clutch assembly includes a third clutch base fixedly connected to the hub shell, a third clutch plate movably engaged on the third clutch base, a third centrifugal block movably engaged with the third clutch base through a third torsion spring, a third pawl is rotatably connected to the third clutch base, the third centrifugal block is movably engaged with the third clutch plate, and the radial swing of the third centrifugal block can drive the third clutch plate to displace and cause the third pawl to clutch the third spline.

[0026] The second centrifugal block and the third centrifugal block are both located between the second clutch base and the third clutch base, and the second centrifugal block and the third centrifugal block are distributed on the same annular track. Compared with the prior art in which the second centrifugal block and the third centrifugal block are respectively distributed on their own annular tracks, and the two annular tracks are axially distributed, the present invention can effectively save the axial space occupied by the speed hub.

[0027] Any of the second pawl and the third pawl is rotatably connected to the corresponding clutch base through a hoop spring, and the corresponding clutch base is provided with an arc groove matched with the cylindrical rotating part of the pawl, and a hoop spring groove matched with the hoop spring, and the pawl is provided with a hoop spring limiting groove matched with the hoop spring. The hoop spring has a tendency to expand outwards, and under the action of the hoop spring, the pawl is restricted to the inner wall of the corresponding clutch base.

[0028] The second clutch plate is provided with a second pawl ratchet limiting portion that limits the second pawl ratchet from rotating toward the second spline, and the second centrifugal block is provided with a second driving pin, and the second driving pin is movably engaged with the bar hole on the second clutch plate, and the radial swing of the second centrifugal block can drive the second clutch plate to rotate and cause the second pawl ratchet to disengage from the second pawl ratchet limiting portion, thereby causing the second pawl ratchet to engage with the second spline.

[0029] The third clutch plate is provided with a third pawl ratchet limiting portion for limiting the rotation of the third pawl ratchet toward the third spline. The third centrifugal block is provided with a third driving pin. The third driving pin is movably engaged with the bar hole on the third clutch plate. The radial swing of the third centrifugal block can drive the third clutch plate to rotate and cause the third pawl ratchet to disengage from the third pawl ratchet limiting portion, thereby causing the third pawl ratchet to engage with the third spline.

[0030] The hoop spring cooperates with the hoop spring groove of the pawl ratchet, so that the pawl ratchet has a tendency to rotate radially toward the corresponding spline. The second centrifugal block following the hub shell rotates after the centrifugal force it receives overcomes the elastic force of the second torsion spring, and drives the second clutch plate to rotate a certain angle through the second drive pin, and the second pawl ratchet limiting part disengages from the second pawl ratchet. Under the action of the hoop spring, the second pawl ratchet rotates radially and cooperates with the second spline. The third centrifugal block following the hub shell rotates after the centrifugal force it receives overcomes the elastic force of the third torsion spring, and drives the third clutch plate to rotate a certain angle through the third drive pin, and the third pawl ratchet limiting part disengages from the third pawl ratchet. Under the action of the hoop spring, the third pawl ratchet rotates radially and cooperates with the third spline.

[0031] The second clutch base is fixed on the inner wall of the hub shell, the third clutch base is integrated on the shell cover, and the shell cover is fixedly mounted on the open end of the hub shell. The third clutch base is integrated on the shell cover, which is beneficial to reducing the axial space occupied by the speed hub compared to the third clutch base and the shell cover being a separate structure.

[0032] The second gear ring and the second spline of the present invention are integrally formed, and the second spline and the second gear ring are radially arranged inside and outside; the third gear ring and the third spline are integrally formed, and the third spline and the third gear ring are radially arranged inside and outside, and the second centrifugal block and the third centrifugal block are distributed on the same annular orbit. Compared with the prior art, the present invention can effectively save the axial space occupied by the speed hub, which is beneficial to the integration of the speed hub and the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below in conjunction with the accompanying drawings:

[0034] Figure 1 is a schematic diagram of a speed-changing hub of the present invention;

[0035] Figure 2 for Figure 1 The diagram of the gear hub viewed from the rear;

[0036] Figure 3 for Figure 1 Exploded diagram of

[0037] Figure 4 for Figure 2 Exploded diagram of

[0038] Figure 5 for Figure 3 Re-explosion diagram;

[0039] Figure 6 is a schematic diagram of the second clutch assembly 21;

[0040] Figure 7 for Figure 6 A schematic diagram of the second clutch assembly 21 viewed from the rear;

[0041] Figure 8 for Figure 6 Exploded diagram.

[0042] Explanation of symbols in the figure:

[0043] 10. First-stage driving assembly; 11. Driving body; 111. Hoop spring positioning groove; 112. First claw ratchet groove;

[0044] 20. Second-stage drive assembly; 21. Second clutch assembly; 211. Second claw and ratchet; 2111. Hoop spring limiting groove; 212. Second clutch base; 2121. Arc groove; 2122. Hoop spring groove; 213. Second clutch plate; 214. Second torsion spring; 215. Second centrifugal block; 216. Second claw and ratchet limiting portion; 217. Second drive pin; 218. Strip hole;

[0045] 22. Second planetary gear set; 221. Second gear ring; 222. Second spline; 223. Second planet carrier;

[0046] 30. third stage drive assembly; 31. third clutch assembly; 311. third pawl ratchet; 312. third clutch base; 314. third torsion spring; 315. third centrifugal block; 32. third planetary gear set; 321. third gear ring; 322. third spline; 323. third planet carrier;

[0047] 40. hub shell; 41. shell cover; 42. second bearing; 43. first gear ring;

[0048] 50. Hub axle; 51. First bearing. DETAILED DESCRIPTION

[0049] like Figure 5 A variable-speed hub with a compact axial structure includes a hub shell 40 pivotally connected to a hub shaft 50, a first-stage drive assembly 10 pivotally connected to the hub shaft, a second-stage drive assembly 20 connected to the first-stage drive assembly via a second planetary gear set, and a third-stage drive assembly 30 connected to the second-stage drive assembly via a third planetary gear set.

[0050] The first-stage driving assembly 10 includes a driving body 11 and a first pawl ratchet arranged on the driving body, and the first pawl ratchet can directly drive the hub shell.

[0051] The second-stage drive assembly 20 includes a second clutch assembly 21, which is located between the hub shell and the second gear ring 221 of the second planetary gear set 22. The second clutch assembly is fixedly connected to the hub shell and can be clutched with the second gear ring; a second spline 222 is provided on the periphery of the second gear ring, and the second clutch assembly is provided with a second pawl 211 that can drive the second spline unidirectionally.

[0052] The third-stage drive assembly 30 includes a third clutch assembly 31, which is located between the hub shell and the third gear ring 321 of the third planetary gear set 32. The third clutch assembly is fixedly connected to the hub shell and can be clutched with the third gear ring; a third spline 322 is provided on the periphery of the third gear ring, and the third clutch assembly is provided with a third pawl 311 that can drive the third spline unidirectionally.

[0053] The second gear ring 221 and the second spline 222 are integrally formed, and the second spline is located at the periphery of the inner teeth of the second gear ring; the third gear ring 321 and the third spline 322 are integrally formed, and the third spline is located at the periphery of the inner teeth of the third gear ring.

[0054] like Figure 5In the first-stage driving assembly 10, the driving body 11 is pivotally connected to the hub shaft 50 through the first bearing 51, and the driving body 11 is pivotally connected to the hub shell 40 through the second bearing 42. The first pawl ratchet is provided with a hoop spring groove, and the driving body 11 is provided with a hoop spring positioning groove 111. The hoop spring cooperates with the hoop spring groove to position the first pawl ratchet in the first pawl ratchet groove 112 of the driving body 11. A first toothed ring 43 is fixed to the inner wall of the hub shell 40, and the inner teeth of the first toothed ring can cooperate with the first pawl ratchet.

[0055] Combination Figures 6 to 8 In the second-stage driving assembly 20, the second clutch assembly 21 includes a second clutch base 212 fixedly connected to the hub shell 40, a second clutch plate 213 movably engaged on the second clutch base, and a second centrifugal block 215 movably engaged with the second clutch base through a second torsion spring 214. The second pawl ratchet 211 is rotationally connected to the second clutch base, and the second centrifugal block is movably engaged with the second clutch plate. The radial swing of the second centrifugal block can drive the second clutch plate to displace and cause the second pawl ratchet to clutch the second spline 222.

[0056] In the second-stage driving assembly 20 , the second clutch base 212 is fixed on the inner wall of the hub shell 40 .

[0057] In the second-stage driving assembly 20, the second pawl ratchet 211 is rotatably connected to the second clutch base 212 through a hoop spring. The second clutch base is provided with an arc-shaped groove 2121 that cooperates with the cylindrical rotating part of the second pawl ratchet, and a hoop spring groove 2122 that cooperates with the hoop spring. The second pawl ratchet is provided with a hoop spring limiting groove 2111 that cooperates with the hoop spring.

[0058] In the second-stage drive assembly 20, the second clutch plate 213 is provided with a second pawl-ratchet limiting portion 216 for limiting the rotation of the second pawl-ratchet 211 toward the second spline 222, and the second centrifugal block 215 is provided with a second driving pin 217, and the second driving pin is movably engaged with the bar hole 218 on the second clutch plate. The radial swing of the second centrifugal block can drive the second clutch plate to rotate and disengage the second pawl-ratchet limiting portion, thereby enabling the second pawl-ratchet to engage with the second spline.

[0059] Combination Figure 3 , Figure 5 In the third-stage driving assembly 30, the third clutch assembly 31 includes a third clutch base 312 fixedly connected to the hub shell 40, a third clutch plate movably engaged on the third clutch base, and a third centrifugal block 315 movably engaged with the third clutch base through a third torsion spring. The third pawl ratchet 311 is rotationally connected to the third clutch base, the third centrifugal block is movably engaged with the third clutch plate, and the radial swing of the third centrifugal block can drive the third clutch plate to displace and cause the third pawl ratchet to clutch the third spline.

[0060] refer to Figure 3 , Figure 4The second centrifugal block 215 and the third centrifugal block 315 are both located between the second clutch base 212 and the third clutch base 312, and the second centrifugal block and the third centrifugal block are distributed on the same annular track.

[0061] In the third-stage driving assembly 30 , the third clutch base 312 is integrated on the housing cover 41 , and the housing cover is fixedly mounted on the open end of the hub housing 40 .

[0062] In the third-stage driving assembly 30, the third pawl ratchet 311 is rotationally connected to the third clutch base 312 through a hoop spring. The third clutch base is provided with an arc-shaped groove that cooperates with the cylindrical rotating part of the third pawl ratchet, and a hoop spring groove that cooperates with the hoop spring. The third pawl ratchet is provided with a hoop spring limiting groove that cooperates with the hoop spring.

[0063] In the third-stage drive assembly 30, the third clutch plate is provided with a third pawl-ratchee limiting portion for limiting the third pawl-ratchee from rotating toward the third spline, and the third centrifugal block is provided with a third driving pin, and the third driving pin is movably engaged with the bar hole on the third clutch plate, and the radial swing of the third centrifugal block can drive the third clutch plate to rotate and cause the third pawl-ratchee to disengage from the third pawl-ratchee limiting portion, thereby causing the third pawl-ratchee to engage with the third spline.

[0064] The driving body 11 is integrated with the second planet carrier 223 of the second planetary gear set; the second gear ring 221 of the second planetary gear set is linked with the third planet carrier 323 of the third planetary gear set.

[0065] The driving body 11 rotates under the drive of the flywheel or the motor. Under the action of centrifugal force, the first claw opens and couples with the first gear ring 43. In this way, the rotating driving body 11 drives the hub shell 40 to rotate.

[0066] When the hub shell 40 is in the first speed stage, the second pawl ratchet 211 and the second spline 222 are in a decoupled state, the third pawl ratchet 311 and the third spline 322 are in a decoupled state, and the first pawl ratchet is coupled to the first gear ring 43. The second spline 222 is idle, and the third spline 322 is idle.

[0067] When the hub shell 40 reaches the second speed, the speed of the hub shell is greater than the speed of the driving body 11, and the speed of the first toothed ring 43 fixedly connected to the hub shell is greater than the speed of the first claw ratchet. The first claw ratchet is in a surpassing state, and the first claw ratchet has no driving effect on the hub shell 40. As the speed of the hub shell increases, under the action of centrifugal force, the second centrifugal block 215 following the hub shell 40 rotates after the centrifugal force it receives overcomes the elastic force of the second torsion spring 214, and drives the second clutch plate 213 to rotate a certain angle through the second driving pin 217, and the second claw ratchet limiting portion 216 disengages from the second claw ratchet 211. Under the action of the hoop spring, the second claw ratchet 211 rotates radially and cooperates with the second spline 222. At this time, the power is transmitted to the driving body 11, the second toothed ring 221, the second spline 222, the second claw ratchet 211, and the hub shell 40. At this time, the third claw ratchet 311 and the third spline 322 are in a decoupled state, and the third spline is idle.

[0068] When the hub shell 40 reaches the third speed, the speed of the second pawl 211 following the hub shell is greater than the speed of the second spline 222, and the second pawl is in an overtaking state. At this time, the first pawl is of course in an overtaking state, and the first pawl and the second pawl have no driving effect on the hub shell 40. As the speed of the hub shell 40 increases, under the action of centrifugal force, the third centrifugal block 315 following the hub shell rotates after the centrifugal force overcomes the elastic force of the third torsion spring, and drives the third clutch plate to rotate a certain angle through the third driving pin, and the third pawl limiter is separated from the third pawl 311. Under the action of the hoop spring, the third pawl rotates radially and cooperates with the third spline 322. At this time, the power is transmitted to the driving body 11, the second gear ring 221, the third planetary carrier 323, the third gear ring 321, the third spline 322, the third pawl 311, and the hub shell 40.

[0069] The driving body 11 drives the second gear ring 221 through the second planetary gear set 22, and the second gear ring drives the hub shell 40 to rotate and increase the speed through the second spline 222 and the second pawl ratchet 211. The second gear ring 221 drives the third gear ring 321 through the third planetary gear set 32, and the third gear ring drives the hub shell 40 to rotate and increase the speed through the third spline 322 and the third pawl ratchet 311.

[0070] When the hub shell 40 rotates at a speed higher than the third rotation speed, the first pawl ratchet, the second pawl ratchet 211 and the third pawl ratchet 311 are all in an overrunning state.

[0071] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A speed-changing hub with a compact axial structure, comprising a hub housing (40) pivotally connected to a hub shaft (50), a first-stage drive assembly (10) pivotally connected to the hub shaft, a second-stage drive assembly (20) connected to the first-stage drive assembly via a second planetary gear set, and a third-stage drive assembly (30) connected to the second-stage drive assembly via a third planetary gear set; The first-stage driving assembly (10) comprises a driving body (11) and a first claw ratchet arranged on the driving body, wherein the first claw ratchet can directly drive the hub shell; The second-stage drive assembly (20) comprises a second clutch assembly (21), the second clutch assembly is located between the hub shell and the second gear ring (221) of the second planetary gear set (22), the second clutch assembly is fixedly connected to the hub shell and can be clutched with the second gear ring; the outer periphery of the second gear ring is provided with a second spline (222), and the second clutch assembly is provided with a second pawl (211) capable of unidirectionally driving the second spline; The third-stage driving assembly (30) comprises a third clutch assembly (31), the third clutch assembly is located between the hub shell and the third gear ring (321) of the third planetary gear set (32), the third clutch assembly is fixedly connected to the hub shell and can be clutched with the third gear ring; the periphery of the third gear ring is provided with a third spline (322), and the third clutch assembly is provided with a third pawl (311) capable of unidirectionally driving the third spline; Features: The second toothed ring (221) and the second spline (222) are integrally formed, and the second spline is located at the periphery of the inner teeth of the second toothed ring; the third toothed ring (321) and the third spline (322) are integrally formed, and the third spline is located at the periphery of the inner teeth of the third toothed ring.

2. The axially compact speed hub according to claim 1, characterized in that: The driving body (11) is fixedly connected to the second planet carrier (223) of the second planetary gear set, or is designed as an integrated whole; The second gear ring (221) of the second planetary gear set is linked to the third planet carrier (323) of the third planetary gear set.

3. The axially compact speed hub according to claim 1, characterized in that: The second clutch assembly (21) comprises a second clutch base (212) fixedly connected to the hub shell (40), a second clutch plate (213) movably engaged with the second clutch base, and a second centrifugal block (215) movably engaged with the second clutch base via a second torsion spring (214); a second claw (211) is rotationally connected to the second clutch base, the second centrifugal block movably engages with the second clutch plate, and radial swing of the second centrifugal block can drive the second clutch plate to move so that the second claw is engaged with the second spline (222); The third clutch assembly (31) comprises a third clutch base (312) fixedly connected to the hub shell (40), a third clutch plate movably engaged with the third clutch base, and a third centrifugal block movably engaged with the third clutch base via a third torsion spring; a third pawl (311) is rotationally connected to the third clutch base, the third centrifugal block movably engages with the third clutch plate, and radial swing of the third centrifugal block can drive the third clutch plate to move so that the third pawl is engaged with the third spline; The second centrifugal block (215) and the third centrifugal block (315) are both located between the second clutch base (212) and the third clutch base (312), and the second centrifugal block and the third centrifugal block are distributed on the same annular track.

4. The axially compact speed hub according to claim 3, characterized in that: Any one of the second pawl ratchet (211) and the third pawl ratchet (311) is rotatably connected to the corresponding clutch base through a hoop spring. The corresponding clutch base is provided with an arc groove that cooperates with the cylindrical rotating part of the pawl ratchet, and a hoop spring groove that cooperates with the hoop spring. The pawl ratchet is provided with a hoop spring limiting groove that cooperates with the hoop spring.

5. The axially compact speed hub according to claim 3, characterized in that: The second clutch plate (213) is provided with a second pawl ratchet limiting portion (216) for limiting the second pawl ratchet (211) from rotating toward the second spline (222); the second centrifugal block (215) is provided with a second driving pin (217); the second driving pin is movably matched with the strip-shaped hole (218) on the second clutch plate; the radial swing of the second centrifugal block can drive the second clutch plate to rotate so that the second pawl ratchet is disengaged from the second pawl ratchet limiting portion, thereby making the second pawl ratchet match with the second spline; The third clutch plate is provided with a third pawl ratchet limiting portion for limiting the rotation of the third pawl ratchet toward the third spline. The third centrifugal block is provided with a third driving pin. The third driving pin is movably engaged with the bar hole on the third clutch plate. The radial swing of the third centrifugal block can drive the third clutch plate to rotate and cause the third pawl ratchet to disengage from the third pawl ratchet limiting portion, thereby causing the third pawl ratchet to engage with the third spline.

6. The axially compact speed hub according to claim 3, characterized in that: The second clutch base (212) is fixed on the inner wall of the hub shell (40), and the third clutch base (312) is integrated on the shell cover (41), and the shell cover is fixedly mounted on the open end of the hub shell.

Images