CN216232802U - Three-speed mid-motor capable of automatically shifting gears - Google Patents

Abstract

The utility model discloses a three-speed mid-set motor capable of automatically shifting gears, and relates to the field of mid-set motors. The key points of the technical scheme are that the power-assisted bicycle comprises a middle shaft mechanism and a power-assisted driving mechanism; the middle shaft mechanism comprises a middle shaft, and an input transmission assembly, a first one-way clutch assembly, a centrifugal clutch assembly and an output transmission assembly are respectively arranged on the middle shaft; the input transmission assembly comprises a pedal power input unit connected with the middle shaft to receive pedal input rotating speed and a power-assisted input unit connected with the power-assisted driving mechanism to receive power-assisted input rotating speed; the bottom bracket bearing mechanism comprises the following transmission paths: the input transmission component, the first one-way clutch component and the output transmission component are connected; and an input transmission assembly, a centrifugal clutch assembly and an output transmission assembly. The utility model can realize automatic gear shifting according to the rotating speed, can improve riding experience and comfort, can reduce the whole volume of the motor and is convenient for the whole vehicle installation.

Description

Three-speed mid-motor capable of automatically shifting gears

Technical Field

The utility model relates to the field of a middle-mounted motor, in particular to a three-speed middle-mounted motor capable of automatically shifting gears.

Background

The universal application in the market at present is that the middle motor is collocated with an external variable speed or a rear hub type internal variable speed hub, the external variable speed is changed by dialing the position of an adjusting chain after being dialed, and the internal variable speed hub is shifted by dialing the angle after being dialed by a finger. However, the arrangement of the middle motor and the transmission results in a complex structure of the whole vehicle and is inconvenient to install.

In order to simplify the structure and installation of the whole vehicle, a transmission-integrated central motor is also present.

For example, the chinese patent with the prior publication number CN112407135A discloses a mid-motor capable of multi-gear speed change adjustment, which includes a middle shaft mechanism, a power-assisted driving mechanism, and a speed change mechanism supported between the middle shaft mechanism and the power-assisted driving mechanism.

For example, a chinese patent with a prior publication number of CN113184106A discloses a mid-set variable speed motor, which includes a middle shaft mechanism, a speed change mechanism, a power-assisted driving mechanism and a shift driving mechanism.

Although the two mid-mounted motors integrate the speed change function, the riding vehicle needs to be actively adjusted, so that the riding experience and the comfort are still to be improved; and the speed change mechanism is used as an independent module, so that the whole volume of the motor is large, and the whole vehicle is not convenient to install.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide the three-speed middle motor capable of automatically shifting gears, which can realize automatic shifting according to the rotating speed, can improve riding experience and comfort, can reduce the whole volume of the motor and is convenient for the whole vehicle installation.

In order to achieve the purpose, the utility model provides the following technical scheme:

a three-speed mid-set motor capable of automatically shifting gears comprises a middle shaft mechanism and a power-assisted driving mechanism; the middle shaft mechanism comprises a middle shaft, and an input transmission assembly, a first one-way clutch assembly, a centrifugal clutch assembly and an output transmission assembly are respectively arranged on the middle shaft;

the input transmission assembly comprises a pedal power input unit connected with the middle shaft to receive pedal input rotating speed and a power-assisted input unit connected with the power-assisted driving mechanism to receive power-assisted input rotating speed;

the bottom bracket bearing mechanism comprises the following transmission paths:

the input transmission component, the first one-way clutch component and the output transmission component are connected; and the number of the first and second groups,

from the input transmission assembly, the centrifugal clutch assembly to the output transmission assembly.

Further, the input transmission assembly comprises a planet carrier, a planet wheel, a fixedly arranged gear ring and a sun shaft sleeve connected with the centrifugal clutch assembly; the pedal power input unit, the power-assisted input unit and the first one-way clutch assembly are respectively connected with the planet carrier.

Further, a second one-way clutch assembly is arranged between the pedal power input unit and the planet carrier.

Furthermore, an inner spigot matched with the second one-way clutch assembly is arranged on the planet carrier.

Furthermore, the planet gears comprise a second-gear planet gear and a third-gear planet gear, and the gear ring is matched with the third-gear planet gear; the sun shaft sleeve comprises a second sun shaft sleeve matched with the second planet gear and a third sun shaft sleeve matched with the third planet gear; the centrifugal clutch assembly comprises a second-gear centrifugal clutch assembly connected with the second-gear sun shaft sleeve and a third-gear centrifugal clutch assembly connected with the third-gear sun shaft sleeve; and the three-gear sun shaft sleeve penetrates through the two-gear sun shaft sleeve and the two-gear centrifugal clutch assembly and is connected with the three-gear centrifugal clutch assembly.

Further, the first one-way clutch component comprises a one-way clutch inner ring which is integrally formed on the planet carrier.

Further, the outer side wall of the planet carrier is provided with a fixing ring connected with the power-assisted input unit, or the power-assisted input unit is integrally formed on the outer side wall of the planet carrier.

Further, the centrifugal clutch assembly comprises a clutch buffer frame, a clutch outer ring and a clutch driving piece; a reset elastic piece is arranged between the clutch buffer frame and the clutch outer ring, and an auxiliary reset structure is arranged between the clutch buffer frame and the clutch driving piece.

Furthermore, the auxiliary reset structure comprises a driving boss arranged on the inner end wall of the clutch buffer frame, and a driving extension part matched with the driving boss is arranged at the end part of the clutch driving piece.

Further, the power-assisted driving mechanism comprises a motor assembly and a one-way transmission speed reduction assembly carried between the motor assembly and the power-assisted input unit.

In conclusion, the utility model has the following beneficial effects:

1. according to the utility model, the centrifugal clutch assembly is integrated on the middle shaft mechanism to realize automatic gear shifting and speed changing, so that the riding experience and comfort can be improved;

2. the centrifugal clutch assembly is integrated on the middle shaft mechanism, so that the overall size of the motor can be reduced, and the whole vehicle is convenient to mount;

3. two planet wheels are integrated on a planet carrier, and then two sun shaft sleeves are configured to serve as input transmission assemblies and are matched with two centrifugal clutch assemblies, so that an automatic three-gear structure is realized, the number of parts and assembly procedures can be reduced, the axial size is reduced, and the overall size of the motor can be reduced.

4. Increase the elastic component that resets and supplementary structure that resets in centrifugal clutch subassembly, come supplementary down to can satisfy the conversion demand of riding passerby to speed and moment of torsion, optimize and ride experience, increase the travelling comfort.

Drawings

Fig. 1 is a schematic overall structure diagram of an automatic gear shifting three-speed mid-motor in an embodiment;

FIG. 2 is a schematic diagram of an internal structure of a three-speed mid-motor capable of automatically shifting gears in an embodiment;

FIG. 3 is a partial assembly cross-sectional view of an automatic shifting three-speed mid-motor of an embodiment;

FIG. 4 is a schematic structural diagram of a planet carrier in an embodiment;

FIG. 5 is a first schematic structural diagram of a third-gear centrifugal clutch assembly in the embodiment;

FIG. 6 is a second schematic structural view of the third-gear centrifugal clutch assembly in the embodiment;

FIG. 7 is a third schematic structural view of the third-gear centrifugal clutch assembly in the embodiment;

FIG. 8 is a fourth schematic structural view of the third-gear centrifugal clutch assembly in the embodiment;

fig. 9 is a schematic structural diagram of a third-gear clutch buffer frame in the embodiment.

In the figure: 1. a middle shaft; 21. a planet carrier; 211. a fixing ring; 212. a wheel groove; 213. an inner spigot; 214. the inner ring is in one-way clutch; 22. a second planet gear; 23. a second sun gear sleeve; 24. a third-gear planet wheel; 25. a third gear sun shaft sleeve; 26. a pedal power input unit; 261. a second one-way clutch assembly; 27. a ring gear; 28. a power-assisted input unit; 29. a first one-way clutch assembly; 31. an output drum; 32. an output end cover; 41. a second-gear clutch buffer frame; 42. a second-gear clutch outer ring; 44. the second gear is engaged with and disengaged from the inner ring; 45. a second clutch output plate; 51. a third gear clutch buffer frame; 511. a third-gear inner boss; 512. a third gear driving boss; 52. a third-gear clutch outer ring; 521. a third-gear outer boss; 53. a third gear clutch driving member; 531. a third gear drive extension; 54. a third gear clutch inner ring; 55. a third clutch output plate; 56. a third-gear centrifugal throwing block; 561. a third gear drive shaft; 57. a third gear reset elastic element; 58. a three-gear driving ring; 581. a third gear release groove; 61. a motor assembly; 62. a motor shaft; 63. a motor output gear; 64. a reduction input gear; 65. a deceleration shaft; 66. a reduction output gear; 7. a fluted disc; 8. and (5) pedaling.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Example (b):

a three-speed mid-set motor capable of automatically shifting gears refers to fig. 1 to 3, and comprises a middle shaft mechanism and a power-assisted driving mechanism; the middle shaft mechanism comprises a middle shaft 1, and an input transmission assembly, a first one-way clutch assembly 29, a centrifugal clutch assembly and an output transmission assembly are respectively arranged on the middle shaft; the input transmission assembly comprises a pedal power input unit 26 connected with the bottom bracket axle 1 for receiving pedal input rotating speed, and an assistant power input unit 28 connected with the assistant driving mechanism for receiving assistant power input rotating speed; the middle shaft mechanism in the embodiment comprises the following transmission paths: from the input transmission assembly, the first one-way clutch assembly 29 to the output transmission assembly; and, from the input transmission assembly, the centrifugal clutch assembly to the output transmission assembly; with centrifugal clutch assembly integration in this embodiment on axis mechanism, can realize automatic shifting according to the rotational speed to can improve ride experience and travelling comfort, and can reduce the whole volume of motor, the whole car installation of being convenient for.

Referring to fig. 1 to 3, the center motor in this embodiment further includes a housing that houses the center shaft mechanism and the power assist drive mechanism therein; both ends of the middle shaft 1 protrude out of the shell, and both ends of the middle shaft 1 are respectively connected with pedals 8; the rider drives the middle shaft 1 to rotate through the pedals 8, so that the pedal power input is realized; one end of the output rotating assembly protrudes out of the shell, a fluted disc 7 positioned on the outer side of the shell is arranged on the output rotating assembly, and power output of the centrally-mounted motor is realized through the fluted disc 7.

Referring to fig. 2 and 3, the power-assisted driving mechanism in this embodiment includes a motor assembly 61, and a one-way transmission speed reduction assembly carried between the motor assembly 61 and the power-assisted input unit 28; by adopting the one-way transmission speed reducing assembly, the rotating speed of the motor assembly 61 can be transmitted to the power-assisted input unit 28, and the rotating speed of the power-assisted input unit 28 cannot be transmitted to the motor assembly 61; specifically, the one-way transmission speed reduction assembly comprises a speed reduction shaft 65, one end of the speed reduction shaft 65 is provided with a speed reduction input gear 64, and the other end is provided with a speed reduction output gear 66; wherein a motor shaft 62 of the motor assembly 61 is provided with a motor output gear 63 engaged with a reduction input gear 64, and a reduction output gear 66 engaged with the assist input unit 28; a unit clutch, specifically a one-way bearing, is arranged between the reduction shaft 65 and the reduction input gear 64, so that the rotation speed of the motor shaft 62 can be transmitted to the power-assisted input unit 28 through the motor output gear 63, the reduction input gear 64, the one-way clutch, the reduction shaft 65 and the reduction output gear 66, and the power-assisted input unit 28 cannot drive the reduction input gear 64 to rotate, thereby realizing one-way transmission; in other alternative embodiments, the structures of the motor assembly 61 and the one-way transmission speed reducing assembly, and the installation position of the one-way clutch can be adjusted as required, and are not limited herein, so that the power-assisted driving mechanism can provide the power-assisted rotating speed.

Referring to fig. 1 to 3, specifically, the input transmission assembly in this embodiment includes a planet carrier 21, a planet gear, a fixedly arranged ring gear 27, and a sun sleeve connected with the centrifugal clutch assembly; the pedal power input unit 26, the power-assisted input unit 28 and the first one-way clutch assembly 29 are respectively connected with the planet carrier 21; in the embodiment, the gear ring 27 is in interference fit with the shell, so that the gear ring 27 is fixed; in other alternative embodiments, the ring gear 27 and the housing may be fixedly connected by fasteners, which are not limited herein.

Referring to fig. 3, a second one-way clutch assembly 261 is disposed between the pedal power input unit 26 and the planet carrier 21 in the present embodiment, specifically, the second one-way clutch assembly 261 is a ratchet and pawl assembly in the present embodiment; of course, in other alternative embodiments, the second one-way clutch assembly 261 may also adopt other one-way clutches, such as one-way bearings, etc., and is not limited herein; in this embodiment, an inner spigot 213 that is engaged with the second one-way clutch assembly is disposed at one end of the planet carrier 21, that is, the ratchet of the ratchet-pawl assembly is embedded in the inner spigot 213 through interference fit, and the pawl seat is integrally formed on the pedal power input unit 26, so that the number of parts and the assembly process can be reduced, and the axial dimension and the radial dimension can be effectively controlled; in other alternative embodiments, the foot-operated power input unit and the pawl seat may also be provided as two parts and then fixedly connected, without limitation.

Referring to fig. 3 and 4, specifically, the pedal power input unit 26 is sleeved on the middle shaft 1, and the middle shaft 1 and the pedal power input unit 26 are linked through spline fit; when the bicycle is pedaled forwards, the middle shaft 1 drives the planet carrier 21 to rotate through the pedal power input unit 26 and the second one-way clutch component 261, and when the bicycle is pedaled backwards, the middle shaft 1 cannot drive the planet carrier 21 to rotate through the second one-way clutch component 261.

Referring to fig. 1 and 3, specifically, the planetary gears in this embodiment include two-gear planetary gears 22 and three-gear planetary gears 24, where the ring gear 27 is engaged with the three-gear planetary gears 24, and the planetary carrier 21 is provided with grooves 212 engaged with the two-gear planetary gears 22 and the three-gear planetary gears 24, respectively; in the present embodiment, the second-gear planet wheels 22 and the third-gear planet wheels 24 share a planet shaft, that is, one planet shaft passes through one second-gear planet wheel 22 and one third-gear planet wheel 24 at the same time, so that the assembly is convenient; in the embodiment, the third-gear planet wheel 24 is close to the outer side of the middle shaft mechanism, and the gear ring 27 is matched with the third-gear planet wheel 24, so that the gear ring 27 is conveniently connected with the shell; the sun shaft sleeve comprises a second gear sun shaft sleeve 23 matched with the second gear planet wheels 22 and a third gear sun shaft sleeve 25 matched with the third gear planet wheels 24; the centrifugal clutch assembly comprises a second-gear centrifugal clutch assembly connected with the second-gear sun shaft sleeve 23 and a third-gear centrifugal clutch assembly connected with the third-gear sun shaft sleeve 25; the third gear sun shaft sleeve 25 penetrates through the second gear sun shaft sleeve 23 and the second gear centrifugal clutch assembly and then is connected with the third gear centrifugal clutch assembly; in the embodiment, the two-gear centrifugal clutch assembly is matched with the three-gear centrifugal clutch assembly, so that three-gear speed change can be realized, and the riding experience is improved; meanwhile, in the present embodiment, the second-gear planetary gear 22 and the third-gear planetary gear are provided on one planet carrier 21, and then the second-gear sun bushing 23 and the third-gear sun bushing 25 are used to output the signals, respectively, which can reduce the number of parts and the number of assembly processes, and reduce the axial size.

Referring to fig. 3 and 4, in particular, in the present embodiment, a needle bearing is disposed between the third sun gear sleeve 25 and the middle shaft 1, a needle bearing is disposed between the second sun gear sleeve 23 and the third sun gear sleeve 25, and a bearing is disposed between the second sun gear sleeve 23 and the planet carrier 21, which is beneficial to reducing the radial dimension by using the needle bearing; in this embodiment, the first one-way clutch assembly 29 includes a one-way clutch inner 214 integrally formed on the planet carrier 21, specifically, in this embodiment, the first one-way clutch assembly 29 is a ratchet and pawl assembly, and the one-way clutch inner 214 is a pawl seat, and the one-way clutch inner 214 is integrally formed on the planet carrier 21, so that the number of parts and the assembly process can be reduced; the outer side wall of the planet carrier 21 is provided with a fixed ring 211 connected with the power-assisted input unit 28, specifically, the power-assisted input unit 28 in this embodiment is a gear, and is fixedly connected with the fixed ring 211 through a bolt; the fixed ring 211 is located between the second-gear planetary gear 22 and the third-gear planetary gear 24, and the power input unit 28 is used for connecting with a power driving mechanism, so that the axial size of the whole body can be controlled; of course, in other alternative embodiments, the power input unit 28 may be integrally formed on the outer side wall of the planet carrier 21, and is not limited herein.

Referring to fig. 1 and 3, the output transmission assembly of the present embodiment includes an output cylinder 31 and an output end cap 32 connected to the output cylinder 31, wherein an axially extending section of the output end cap 32 protrudes from the housing for connecting with the toothed plate 7; the first one-way clutch assembly 29 is arranged between the planet carrier 21 and the output cylinder 31, so that the rotating speed of the planet carrier 21 is directly transmitted to the output cylinder 31 through the first one-way clutch assembly 29 in the first gear state; the second-gear centrifugal clutch assembly and the third-gear centrifugal clutch assembly are respectively arranged between the second-gear sun shaft sleeve 23 and the output barrel 31, the rotating speed of the planet carrier 21 is transmitted to the output barrel 31 through the second-gear sun shaft sleeve 23 and the second-gear centrifugal clutch assembly in the second-gear state, the rotating speed of the output barrel 31 is greater than that of the planet carrier 21 at the moment, and the first one-way clutch assembly 29 is in an overrunning state; in the third gear state, the rotational speed of the planet carrier 21 is transmitted to the output barrel 31 through the third gear sun bushing 25 and the third gear centrifugal clutch assembly, and at this time, the rotational speed of the output barrel 31 is greater than the rotational speeds of the planet carrier 21 and the second gear sun bushing 23, and both the first one-way clutch assembly 29 and the second gear centrifugal clutch assembly are in the overrunning state.

Referring to fig. 3, in the present embodiment, the second-gear centrifugal clutch assembly and the third-gear centrifugal clutch assembly both implement state change according to the output speed, that is, the second-gear centrifugal clutch assembly and the third-gear centrifugal clutch assembly both implement state change according to the speed of the output barrel 31, so as to implement automatic gear shifting; of course, in other alternative embodiments, the centrifugal clutch assembly may also realize the state change according to the input speed, and is not limited herein; specifically, the secondary centrifugal clutch assembly comprises a secondary clutch buffer frame 41, a secondary clutch outer ring 42, a secondary clutch driving piece, a secondary clutch inner ring 44, a secondary clutch output plate 45, a secondary driving ring and a secondary centrifugal throwing block; one end of a two-gear sun shaft sleeve 23 is meshed with a two-gear planet wheel 22, the other end of the two-gear sun shaft sleeve is embedded into a two-gear clutch buffer frame 41, the two-gear sun shaft sleeve 23 and the two-gear clutch buffer frame 41 are in spline fit to realize circumferential linkage, and a bearing is arranged between the two-gear clutch buffer frame 41 and the output barrel 31; the inner end of the second clutch output plate 45 is connected with the second clutch inner 44, and the outer end is connected with the output cylinder 31; the second-gear centrifugal throwing block is arranged on the second-gear clutch output plate 45, and when the speed of the output barrel 31 reaches the gear shifting speed, the second-gear centrifugal throwing block is thrown away under the action of centrifugal force to drive the second-gear driving ring to rotate, so that the second-gear clutch driving piece is released, and the second-gear clutch outer ring 42 and the second-gear clutch inner ring 44 are driven by the second-gear clutch driving piece; at this time, the rotation speed of the second gear sun bushing 23 is transmitted to the output barrel 31 through the second gear clutch buffer frame 41, the second gear clutch outer ring, the second gear clutch driving member, the second gear clutch inner ring 44 and the second gear clutch output plate 45; if the second-gear centrifugal clutch assembly realizes the state change according to the input speed, the second-gear clutch buffer frame 41 is connected with the output barrel 31, and the second-gear clutch output plate 45 is separated from the output barrel 31 and connected with the second-gear sun bush 23.

Referring to fig. 3 and fig. 5 to 9, specifically, the three-gear centrifugal clutch assembly includes a three-gear clutch buffer frame 51, a three-gear clutch outer ring 52, a three-gear clutch driving member 53, a three-gear clutch inner ring 54, a three-gear clutch output plate 55, a three-gear centrifugal thrower 56 and a three-gear driving ring 58, wherein the three-gear driving ring 58 is provided with a three-gear release groove 581 engaged with the three-gear clutch driving member 53; the three-gear centrifugal thrower 56 is arranged on the three-gear clutch output plate 55, and is respectively positioned on two sides of the three-gear clutch output plate 55 together with the three-gear driving ring 58; the three-gear centrifugal throw block 56 is provided with a three-gear driving shaft 561 which penetrates through the three-gear clutch output plate 55 and then is connected with the three-gear driving ring 58; one end of the three-gear sun shaft sleeve 25 is meshed with the three-gear planet wheel 24, the other end of the three-gear sun shaft sleeve is embedded into the three-gear clutch buffer frame 51, and the three-gear sun shaft sleeve 25 is matched with the three-gear clutch buffer frame 51 through a spline, so that circumferential linkage is realized; a bearing is arranged between the three-gear clutch buffer frame 51 and the middle shaft 1, and a three-gear clutch output plate 55 is connected with the output cylinder 31; when the rotating speed of the output barrel 31 reaches the gear shifting speed, the three-gear centrifugal thrower 56 throws away under the action of centrifugal force and drives the three-gear driving ring 58 to rotate, so that the three-gear clutch driving piece 53 is inserted into the three-gear release groove 581 after bouncing up, and the three-gear clutch inner ring 54 and the three-gear clutch outer ring 52 realize transmission through the three-gear clutch driving piece 53; at this time, the rotation speed of the three-gear sun bushing 25 is transmitted to the output cylinder 31 through the three-gear clutch buffer frame 51, the three-gear clutch outer 52, the three-gear clutch driving member 53, the three-gear clutch inner 54 and the three-gear clutch output plate 55; in this embodiment, the second-gear centrifugal thrower and the third-gear centrifugal thrower 56 are arranged between the second-gear clutch output plate 45 and the third-gear clutch output plate 55 in a crossing manner, and the axial dimension can be effectively controlled.

Referring to fig. 6 to 9, in the present embodiment, a reset elastic member is disposed between the clutch buffer frame and the clutch outer ring, and an auxiliary reset structure is disposed between the clutch buffer frame and the clutch driving member; the elastic component that resets cooperates with supplementary structure that resets, is favorable to realizing down shifting smoothly to satisfy and ride passerby to the conversion demand of speed and moment of torsion, optimize the experience of riding, increase the travelling comfort.

Referring to fig. 6 to 9, specifically, taking a three-gear centrifugal clutch assembly as an example, in this embodiment, three-gear inner bosses 511 are uniformly distributed on an inner side wall of a three-gear clutch buffer frame 51 along a circumferential direction, and three-gear outer bosses 521 matched with the three-gear inner bosses 511 are uniformly distributed on an outer side wall of a three-gear clutch outer ring 52 along the circumferential direction; after the third-gear inner boss 511 is contacted with the third-gear outer boss 521, the circumferential linkage of the third-gear clutch buffer frame 51 and the third-gear clutch outer ring 52 is realized; buffering type transmission is realized between the three-gear clutch buffer frame 51 and the three-gear clutch outer ring 52 through the three-gear inner boss 511 and the three-gear outer boss 521, and the riding experience is favorably improved.

Referring to fig. 6 to 9, in the present embodiment, two third-gear return elastic members 57 are disposed between the third-gear clutch cushion frame 51 and the third-gear clutch outer 52; specifically, the three-gear reset elastic element 57 is V-shaped, one end of which is bent and then embedded into the end surface of the three-gear clutch outer ring 52, and the other end of which is bent and then embedded into the inner end surface of the three-gear clutch buffer frame 51; when the third-gear clutch driving piece 53 is in a pressing state, the third-gear reset elastic piece 57 is in an opening state; after the third-gear clutch driving piece 53 bounces and is combined with the third-gear clutch outer ring 52, the third-gear reset elastic piece 57 is compressed; in this embodiment, the three-gear auxiliary reset structure includes three-gear driving bosses 512 uniformly distributed on the inner end wall of the three-gear clutch buffer frame 51 along the circumferential direction, and the end of the three-gear clutch driving member 53 is provided with a three-gear driving extension portion 531 matched with the three-gear driving bosses 512; after the riding middle gear is combined, the three-gear inner boss 511 of the three-gear clutch buffer frame 51 is contacted with the three-gear outer boss 521 of the three-gear clutch outer ring 52, and the three-gear reset elastic piece 57 is compressed; when the rider decelerates and the pedals stop stepping, the three-gear clutch buffer frame 51 and the three-gear clutch outer ring 52 are in a state of not receiving driving force, and at the moment, the three-gear resetting elastic piece 57 releases elastic force, so that the three-gear clutch buffer frame 51 and the three-gear clutch outer ring 52 are reset; the three-gear clutch buffer frame 51 is reversely pushed to rotate by the three-gear reset elastic piece 57, and in the rotating process of the three-gear clutch buffer frame 51, the three-gear driving boss 512 on the inner end surface of the three-gear clutch buffer frame is contacted with the three-gear driving extension part 531 on the end part of the three-gear clutch driving piece 53, and the three-gear clutch driving piece 53 is pressed downwards; because the rotating speed is low in the speed reduction state and the centrifugal force is small, the three-gear clutch driving piece 53 is pressed down and then is collected by the three-gear driving ring 58, so that the three-gear centrifugal clutch assembly is in a disengagement state and is released again after being accelerated; adopt three to keep off elastic component 57 that resets and three keep off supplementary structure that resets in this embodiment and cooperate, come supplementary down gear to satisfy the conversion demand of riding passerby to speed and moment of torsion, optimize and ride experience, increase the travelling comfort.

The working principle is as follows:

first gear: the riding bicycle drives the middle shaft 1 to rotate after being treaded, and the middle shaft 1 drives the treading power input unit 26 to rotate; the pedal power input unit 26 is provided with a torque sensing assembly (not shown in the drawing), after the torque sensing assembly collects a torque signal, the motor assembly 61 is started, and the boosting rotation speed is input to the boosting input unit 28 through the reduction output gear 66; the rotating speed of the pedal power input unit 26 is transmitted to the planet carrier 21 through the second one-way clutch assembly 261, the rotating speed of the power-assisted input unit 28 is also transmitted to the planet carrier 21, and the rotating speed of the planet carrier 21 is transmitted to the fluted disc 7 through the first one-way clutch assembly 29, the output cylinder 31 and the output end cover 32, so that the first-gear riding state is realized; and in the first gear state, the second-gear centrifugal clutch assembly and the third-gear centrifugal clutch assembly are in a disengaged state.

And (2) second: when the output speed reaches the second gear shift critical point, the second gear centrifugal clutch assembly is combined, and the rotating speed of the planet carrier 21 is transmitted to the fluted disc 7 through the second gear sun bush 23, the second gear centrifugal clutch assembly, the output drum 31 and the output end cover 32, so that the riding in the second gear state is realized; in the second gear state, the rotational speed of the output drum 31 is greater than the rotational speed of the carrier 21, the first one-way clutch assembly 29 is in the overrunning state, and the third gear centrifugal clutch assembly is still in the disengaged state.

And (3) third gear: when the output speed reaches a three-gear shift critical point, the three-gear centrifugal clutch assembly is combined, and the rotating speed of the planet carrier 21 is transmitted to the fluted disc 7 through the three-gear sun shaft sleeve 25, the three-gear centrifugal clutch assembly, the output cylinder 31 and the output end cover 32, so that the three-gear riding is realized; in the third gear state, the rotation speed of the output drum 31 is greater than the rotation speeds of the planet carrier 21 and the second gear sun bush 23, and both the first one-way clutch assembly 29 and the second gear centrifugal clutch assembly are in an overrunning state.

Gear reduction: the rider decelerates, the pedal stops trampling, the rotating speed of the output cylinder 31 is reduced at the moment, when the rotating speed of the output cylinder 31 is reduced to a three-gear shift critical point, the three-gear centrifugal throwing block 56 is reset and contracted under the action of elastic force, and is matched with the three-gear reset elastic piece 57 and the three-gear auxiliary reset structure, so that the three-gear centrifugal clutch assembly is successfully reset to a disengagement state, and the gear returns to the second gear at the moment; when the rotating speed of the output drum 31 is reduced to the critical point of the second gear shift, the second-gear centrifugal clutch assembly is reset to the disengaged state, and the gear is continuously returned to the first gear.

Claims (10)

1. A three-speed mid-motor capable of automatically shifting is characterized in that: comprises a middle shaft mechanism and an assistant driving mechanism; the middle shaft mechanism comprises a middle shaft, and an input transmission assembly, a first one-way clutch assembly, a centrifugal clutch assembly and an output transmission assembly are respectively arranged on the middle shaft;

the input transmission assembly comprises a pedal power input unit connected with the middle shaft to receive pedal input rotating speed and a power-assisted input unit connected with the power-assisted driving mechanism to receive power-assisted input rotating speed;

the bottom bracket bearing mechanism comprises the following transmission paths:

the input transmission component, the first one-way clutch component and the output transmission component are connected; and the number of the first and second groups,

from the input transmission assembly, the centrifugal clutch assembly to the output transmission assembly.

2. The automatically shiftable three speed center motor according to claim 1, wherein: the input transmission assembly comprises a planet carrier, a planet wheel, a fixedly arranged gear ring and a sun shaft sleeve connected with the centrifugal clutch assembly; the pedal power input unit, the power-assisted input unit and the first one-way clutch assembly are respectively connected with the planet carrier.

3. The automatically shiftable three speed center motor according to claim 2, wherein: and a second one-way clutch component is arranged between the pedal power input unit and the planet carrier.

4. The automatically shiftable three speed center motor of claim 3, wherein: and the planet carrier is provided with an inner spigot matched with the second one-way clutch component.

5. The automatically shiftable three speed center motor according to claim 2, wherein: the planet gears comprise a second-gear planet gear and a third-gear planet gear, and the gear ring is matched with the third-gear planet gear; the sun shaft sleeve comprises a second sun shaft sleeve matched with the second planet gear and a third sun shaft sleeve matched with the third planet gear; the centrifugal clutch assembly comprises a second-gear centrifugal clutch assembly connected with the second-gear sun shaft sleeve and a third-gear centrifugal clutch assembly connected with the third-gear sun shaft sleeve; and the three-gear sun shaft sleeve penetrates through the two-gear sun shaft sleeve and the two-gear centrifugal clutch assembly and is connected with the three-gear centrifugal clutch assembly.

6. The automatically shiftable three speed center motor according to claim 2, wherein: the first one-way clutch component comprises a one-way clutch inner ring which is integrally formed on the planet carrier.

7. The automatically shiftable three speed center motor according to claim 2, wherein: the outer side wall of the planet carrier is provided with a fixing ring connected with the power-assisted input unit, or the power-assisted input unit is integrally formed on the outer side wall of the planet carrier.

8. The automatically shiftable three speed center motor according to claim 1, wherein: the centrifugal clutch assembly comprises a clutch buffer frame, a clutch outer ring and a clutch driving piece; a reset elastic piece is arranged between the clutch buffer frame and the clutch outer ring, and an auxiliary reset structure is arranged between the clutch buffer frame and the clutch driving piece.

9. The automatically shiftable three speed center motor of claim 8, wherein: the auxiliary reset structure comprises a driving boss arranged on the inner end wall of the clutch buffer frame, and a driving extension part matched with the driving boss is arranged at the end part of the clutch driving piece.

10. The automatically shiftable three speed center motor according to claim 1, wherein: the power-assisted driving mechanism comprises a motor component and a one-way transmission speed reducing component carried between the motor component and the power-assisted input unit.

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