CN112407135A

CN112407135A - Mid-motor capable of multi-gear variable speed adjustment

Info

Publication number: CN112407135A
Application number: CN202011318090.0A
Authority: CN
Inventors: 贺先兵; 官景旗; 邹斌; 黄善劲
Original assignee: Bafang Electric Suzhou Co Ltd
Current assignee: Bafang Electric Suzhou Co Ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-02-26
Anticipated expiration: 2040-11-23
Also published as: WO2022105195A1; CN112407135B

Abstract

The invention discloses a mid-mounted motor capable of achieving multi-gear speed change adjustment, and relates to the field of moped motors. The key point of the technical scheme is that the bicycle power output device comprises a middle shaft mechanism, wherein the middle shaft mechanism comprises a pedal power input assembly and a driving power output assembly; the power-assisted driving mechanism comprises a power-assisted motor and a power-assisted input assembly; the speed change mechanism comprises a speed change input assembly, a gear change execution assembly, a gear change adjusting assembly and a speed change output assembly, wherein the speed change input assembly comprises a pedal speed change input assembly and a power-assisted speed change input assembly; the pedal power input assembly is connected with the pedal speed change input assembly to realize pedal power input, the power-assisted input assembly is connected with the power-assisted speed change input assembly to realize auxiliary power input, and the speed change output assembly is connected with the driving power output assembly to realize driving force output. The invention has the functions of motor power assistance and multi-gear transformation, can reduce modules on the power-assisted bicycle, realizes multi-gear variable speed adjustment, and simplifies user assembly.

Description

Mid-motor capable of multi-gear variable speed adjustment

Technical Field

The invention relates to the field of moped motors, in particular to a middle motor capable of being adjusted in a multi-gear speed changing mode.

Background

The motor of the moped is mainly a common speed-reducing middle-arranged motor in the market, the gear shifting can not be realized to change the speed, and the speed change of the bicycle still depends on the gear switcher of the bicycle.

If a user wants the power assistance and the smooth speed change of the motor, two systems of the bicycle gear switcher and the speed reduction middle-placed motor are needed. However, both systems are not only difficult to match but also the assembly of the bicycle becomes relatively complicated.

The prior Chinese patent with the publication number of CN104953759B discloses a middle motor with a variable reduction ratio for an electric bicycle, which comprises a shell, a motor, a first-stage big gear, a second-stage small gear and a power output sleeve, wherein the second-stage big gear is fixedly connected with a double-layer one-way overrunning clutch and a differential planetary gear reduction mechanism, and the reverse rotation of the second-stage big gear drives a middle output ring of the double-layer one-way overrunning clutch and the power output sleeve to form a low-speed output mechanism through the differential planetary gear reduction mechanism and an inner ring of the double-layer one-way overrunning clutch; the second-stage large gear positively rotates to drive the middle output ring of the double-layer one-way overrunning clutch and the power output sleeve to form a high-speed output mechanism through the outer ring of the double-layer one-way overrunning clutch.

However, the speed of the mid-set motor cannot be changed when the motor is used for pedaling, and only two different reduction ratios can be realized through the motor.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a middle motor capable of being adjusted in a multi-gear speed changing manner, which has the functions of motor assistance and multi-gear shifting, can reduce modules on a power-assisted bicycle and enables the assembly of a user to be simpler.

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

a multi-gear variable-speed adjustable centrally-mounted motor comprises:

the middle shaft mechanism comprises a pedal power input assembly and a driving power output assembly;

the power-assisted driving mechanism comprises a power-assisted motor and a power-assisted input assembly; and the number of the first and second groups,

the speed change mechanism is borne between the middle shaft mechanism and the power-assisted driving mechanism and comprises a speed change input assembly, a gear shift execution assembly, a gear shift adjusting assembly and a speed change output assembly, and the speed change input assembly comprises a pedal speed change input assembly and a power-assisted speed change input assembly;

the power-assisted bicycle is characterized in that the pedal power input assembly is connected with the pedal speed change input assembly to realize pedal power input, the power-assisted input assembly is connected with the power-assisted speed change input assembly to realize auxiliary power input, and the speed change output assembly is connected with the driving power output assembly to realize driving force output.

Furthermore, the pedal power input assembly comprises a pedal input gear, a middle shaft is arranged in the middle of the pedal input gear, and the middle shaft is in linkage fit with the pedal input gear; the driving power output assembly comprises an output gear which is supported on the middle shaft in a rolling mode, and the output gear is connected with a chain wheel.

Furthermore, the power-assisted input assembly comprises a first planet carrier, a plurality of first planet wheels and a power-assisted input gear ring, and a power-assisted input unit connected with the power-assisted variable-speed input assembly is arranged on the power-assisted input gear ring; the power assisting motor comprises a motor shaft, and a motor shaft sun gear matched with the first planet gear is arranged on the motor shaft.

Further, the first planet wheel comprises an input planet wheel and an output planet wheel which are coaxially linked, wherein the input planet wheel is meshed with the sun wheel of the motor shaft, and the output planet wheel is meshed with the boosting input gear ring.

Furthermore, the power-assisted input unit is a power-assisted input gear, the power-assisted variable-speed input assembly comprises a motor input gear, and an idler gear assembly is arranged between the power-assisted input gear and the motor input gear.

Furthermore, the pedal variable-speed input assembly comprises a middle shaft input sleeve, and a middle shaft input gear is arranged on the outer side wall of the middle shaft input sleeve in a linkage manner; the power-assisted variable-speed input assembly comprises a motor input gear which is sleeved on the middle shaft input sleeve and is in one-way linkage with the middle shaft input sleeve.

Furthermore, the variable speed input assembly comprises a middle shaft input sleeve and a sliding sleeve, and the sliding sleeve and the middle shaft input sleeve are in circumferential linkage fit;

the gear shifting execution assembly comprises a variable speed gear ring, a second planet carrier, a multi-connected planet gear and N gear shifting sun gears matched with the multi-connected planet gear, and the sliding sleeve can be in circumferential linkage matching with the variable speed gear ring;

the variable speed output component comprises a variable speed output sleeve in one-way linkage fit with the planet carrier;

the gear shifting adjusting assembly comprises a first sliding block, and the first sliding block can sequentially stop N gear shifting sun gears along the axial direction to realize 1 st-N gear adjustment of the speed changing mechanism.

Further, the sliding sleeve is also capable of moving axially relative to the bottom bracket input sleeve;

the gear shifting execution assembly further comprises a first spring for applying elastic thrust F1 to the gear shifting ring gear;

the sliding sleeve can axially limit the speed change gear ring and limit the speed change gear ring to generate displacement under the action of elastic thrust F1;

the gear shifting adjusting assembly further comprises a second sliding block, the second sliding block can axially limit the sliding sleeve and limit the sliding sleeve to generate displacement under the action of elastic thrust F1;

the second sliding block can push the sliding sleeve to move axially, and the speed change gear ring can move axially under the action of elastic thrust F1;

the speed-changing gear ring can move to be in clutch with the end part of the speed-changing output sleeve, so that circumferential linkage of the speed-changing gear ring and the speed-changing output sleeve is realized, and the (N + 1) th gear adjustment of the speed-changing mechanism is realized on the basis of the (N) th gear.

Further, after the variable-speed gear ring is connected with the variable-speed output sleeve, the second sliding block can push the sliding sleeve to move continuously, and the sliding sleeve can move to be contacted with the second planet carrier;

after the sliding sleeve is contacted with the second planet carrier, the end parts of the sliding sleeve and the second planet carrier are clutched to realize circumferential linkage, and at the moment, the circumferential linkage matching relation of the sliding sleeve and the speed change gear ring is released, and on the basis of the (N + 1) th gear, the (N + 2) th gear adjustment of the speed change mechanism is realized.

Furthermore, the first sliding block can reciprocate, and the (N + 3) -2N + 1-th gear adjustment of the speed change mechanism can be realized on the basis of the (N + 2) -th gear.

Furthermore, the gear shifting adjusting assembly comprises a gear shifting shaft cylinder which is arranged in the middle of the gear shifting input assembly, the gear shifting executing assembly and the gear shifting output assembly in a penetrating manner, and a reciprocating driving rod which can move relative to the gear shifting shaft cylinder along the axial direction is arranged in the gear shifting shaft cylinder; the first sliding block is borne on the reciprocating driving rod and is in elastic linkage fit with the reciprocating driving rod along the axial direction; and the reciprocating driving rod and the speed changing shaft cylinder are respectively provided with a first limiting sliding groove and a second limiting sliding groove which are matched with the first sliding block.

Further, a driving sleeve is sleeved on the reciprocating driving rod, and the axial position of the driving sleeve relative to the speed change shaft barrel is unchanged; the driving sleeve is provided with a first driving pin embedded in the outer side wall of the reciprocating driving rod in a penetrating mode, and the outer side wall of the reciprocating driving rod is provided with a reciprocating chute matched with the first driving pin.

Furthermore, a push plate which is axially linked with the second slide block is embedded on the speed changing shaft cylinder, and a third limiting sliding groove matched with the push plate is formed in the speed changing shaft cylinder; the push plate is provided with a second driving pin embedded in the outer side wall of the driving sleeve in a penetrating mode, and the outer side wall of the driving sleeve is provided with a pushing groove matched with the second driving pin.

Furthermore, the gear shifting adjusting component is connected with a gear shifting adjusting driving component used for controlling the driving sleeve to rotate.

In conclusion, the invention has the following beneficial effects:

1. the power-assisted motor is integrated with the speed change mechanism and matched with an electric whole set of control, so that the efficiency of the power-assisted motor is maximized, smooth speed change experience is realized, and meanwhile, modules on the power-assisted bicycle are reduced, so that the assembly of a user is simpler;

2. the middle shaft mechanism, the speed change mechanism and the power-assisted driving mechanism form a three-shaft design, and the design ensures small size and weight reduction of the whole motor;

3. the first planet wheel is used for realizing high reduction ratio on one shaft, so that the plane space of the power-assisted driving mechanism is effectively reduced, meanwhile, the stress on a single gear can be effectively reduced, and the nylon gear can be used for ensuring low noise of the motor output at high rotating speed;

4. speed change mechanism can bear pedal input alone and realize the variable speed output, also can bear pedal input and motor helping hand input simultaneously and realize the variable speed output, can realize the variable speed regulation that 1 ~ 2N +1 kept off moreover, can bring more smooth and easy and laborsaving experience of riding for riding passerby.

Drawings

Fig. 1 is a schematic overall structure diagram of a mid-set motor capable of multi-gear variable speed adjustment in embodiment 1;

FIG. 2 is a schematic structural view of a power assist drive mechanism, a transmission mechanism, and a bottom bracket mechanism in embodiment 1;

FIG. 3 is a schematic view of a power assist input ring gear and idler assembly according to embodiment 1;

FIG. 4 is a first schematic structural view of the booster drive mechanism according to embodiment 1;

FIG. 5 is a second schematic structural view of the booster drive mechanism according to embodiment 1;

FIG. 6 is a schematic structural view of a booster motor according to embodiment 1;

FIG. 7 is a partial schematic part view of a bottom bracket mechanism in accordance with embodiment 1;

FIG. 8 is a schematic structural view of a bottom bracket mechanism in embodiment 1;

fig. 9 is a sectional view of the speed change mechanism in embodiment 1;

FIG. 10 is an exploded view of the bottom bracket input sleeve, the sliding sleeve and the planet carrier in embodiment 1;

fig. 11 is a schematic structural view of a shift ring gear in embodiment 1;

fig. 12 is an exploded schematic view of a carrier, multiple planetary gears, and a variable speed output sleeve in embodiment 1;

fig. 13 is an exploded schematic view of the first sun gear, the second sun gear, and the third sun gear in embodiment 1;

fig. 14 is a schematic displacement gear diagram of the first slide block and the second slide block in embodiment 1;

FIG. 15 is a schematic diagram showing a shift process of a mid-motor multi-speed adjusting transmission mechanism in embodiment 1;

FIG. 16 is an exploded view of the shift adjusting assembly in example 1;

FIG. 17 is a sectional view of a shift adjusting assembly in embodiment 1;

fig. 18 is a schematic structural view of a drive sleeve and a second drive pin in embodiment 1;

FIG. 19 is an exploded view of the driving sleeve and the reciprocating driving rod in the embodiment 1;

FIG. 20 is an exploded view of a shift adjustment actuator in accordance with embodiment 1;

FIG. 21 is a sectional view of a mid-motor multiple speed adjusting transmission mechanism according to embodiment 2;

FIG. 22 is an enlarged view of portion A of FIG. 21;

FIG. 23 is an exploded perspective view of the bottom bracket input sleeve and sliding sleeve of example 2;

fig. 24 is an exploded schematic view of the first sun gear, the second sun gear, and the third sun gear in embodiment 2;

FIG. 25 is a schematic structural view of a shift adjusting assembly in embodiment 2;

fig. 26 is a sectional view of a shift adjusting assembly in embodiment 2.

In the figure: 1. a shift shaft barrel; 11. a second limiting chute; 12. a third limiting chute; 21. a first slider; 22. a guide bar; 23. a guide rod limiting block; 24. a third spring; 25. a reciprocating drive rod; 251. a reciprocating sleeve portion; 2511. a first limiting chute; 2512. positioning a bumping post; 252. a reciprocating drive section; 2521. an axially extending section; 2522. a third chute; 2523. a second chute; 2524. a first chute; 253. a limiting rod; 254. a first bumping post; 255. a second bumping post; 26. a fourth spring; 27. a first drive pin; 3. a drive sleeve; 31. a first push slot; 32. a second push groove; 33. a third push slot; 34. a first pin hole; 35. a third bearing; 41. a second slider; 42. pushing the plate; 43. a claw; 44. a second drive pin; 51. a middle shaft input sleeve; 52. a middle shaft input gear; 53. a motor input gear; 54. a second one-way clutch assembly; 55. a first bearing; 56. a keyway; 61. a sliding sleeve; 611. a sleeve portion; 612. a ring plate portion; 613. a spline; 614. a first rodent; 615. a third rodent; 616. stopping the opening; 617. a bayonet; 62. a speed change ring gear; 621. a second rodent; 622. an inner tooth portion; 623. a fifth rodent; 63. a second planet carrier; 631. supporting the end plate; 632. a bushing; 633. a fourth tooth; 634. a pawl assembly; 635. a second planet shaft; 64. a multi-connected planet wheel; 641. a first planet gear; 642. a second planet wheel; 643. a third planet gear; 651. a first sun gear; 6511. a first stopper groove; 652. a second sun gear; 6521. a second detent groove; 653. a third sun gear; 6531. a third detent groove; 66. a second spring; 67. a first spring; 671. a spring bushing; 672. a first planar bearing assembly; 681. a fifth spring; 682. a planar bearing support; 683. a ball cage assembly; 71. a variable speed output sleeve; 72. a variable speed output gear; 73. a second bearing; 74. a sixth rodent; 75. a ratchet portion; 81. a first housing; 82. a second housing; 83. a gearbox housing; 84. a first inner support; 841. opening the gap; 85. a second inner support; 91. a power-assisted drive mechanism; 911. a booster motor; 9111. a motor shaft; 9112. a motor shaft sun gear; 912. a first carrier; 9131. an input planet wheel; 9132. an output planet wheel; 914. a first planet shaft; 915. the boosting input gear ring; 916. a power-assisted input gear; 917. a rotary transformer control panel; 918. a rotary variable magnetic steel fixing seat; 919. rotating the variable magnetic steel; 92. an idler assembly; 93. a middle shaft mechanism; 931. a middle shaft; 932. a sleeve; 933. a foot pedal input gear; 934. an output gear; 935. an output spline; 936. a first one-way clutch assembly; 937. a torque sensing assembly; 938. a chain wheel; 941. a gear shifting motor; 942. a motor gear; 943. a reduction gear set; 944. a gear shifting drive gear; 945. a gear box.

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 1:

a multi-gear speed-changing adjustable centrally-mounted motor is disclosed, referring to fig. 1 and fig. 2, and comprises a first shell 81 and a second shell 82, wherein a cavity formed by the first shell 81 and the second shell 82 is internally provided with a power-assisted driving mechanism 91, a speed-changing mechanism and a middle shaft mechanism 93; the power drive mechanism 91, the speed change mechanism and the center shaft mechanism 93 form a three-shaft design, which ensures the small size and weight reduction of the whole motor.

Referring to fig. 2 and 4, the middle shaft mechanism 93 comprises a pedal power input assembly and a driving power output assembly, and the power-assisted driving mechanism 91 comprises a power-assisted motor 911 and a power-assisted input assembly; the speed change mechanism comprises a speed change input assembly, a gear change executing assembly, a gear change adjusting assembly and a speed change output assembly, wherein the speed change input assembly comprises a pedal speed change input assembly and a power-assisted speed change input assembly; the power-assisted bicycle is characterized in that the pedal power input assembly is connected with the pedal speed change input assembly to realize pedal power input, the power-assisted input assembly is connected with the power-assisted speed change input assembly to realize auxiliary power input, and the speed change output assembly is connected with the driving power output assembly to realize driving force output.

Referring to fig. 2 to 6, the power-assisted input assembly includes a first planet carrier 912, a plurality of first planet gears and a power-assisted input ring gear 915, wherein a first planet shaft 914 connected with the first planet carrier 912 is arranged in the middle of the first planet gears in a penetrating manner; the power assisting motor 911 comprises a motor shaft 9111, and a motor shaft sun gear 9112 matched with the first planet gear is arranged on the motor shaft 9111; in the embodiment, the assisting power input assembly performs speed reduction output through a planetary structure, and in other alternative embodiments, the assisting power input assembly may also be driven by a gear transmission of a fixed-axis gear train or a worm and gear transmission, and the like, which is not limited herein.

Referring to fig. 1 to 6, the first planet gear includes an input planet gear 9131 and an output planet gear 9132, which are coaxially linked, in this embodiment, the input planet gear 9131 and the output planet gear 9132 are integrally formed, but they may be separately and then fixedly connected; the input planet wheel 9131 is meshed with a motor shaft sun gear 9112, and the output planet wheel 9132 is meshed with internal teeth of the inner wall of the power-assisted input gear 915; the first planet carrier 912 is connected with the second housing 82 through bolts, and the stator of the power-assisted motor 911 is connected with the second housing 82 through bolts, so that the rotating speed of the motor shaft 9111 is transmitted to the power-assisted input gear ring 915 through the motor shaft sun gear 9112, the input planet gear 9131 and the output planet gear 9132.

Referring to fig. 4 and 5, in the present embodiment, the number of teeth of the input planet gear 9131 is greater than that of the output planet gear 9132, so that a high reduction ratio can be realized on one shaft, which is beneficial to reducing the planar space of the power-assisted input assembly; meanwhile, the stress on a single gear can be effectively reduced by the structural design of the first planet gear, and then a nylon gear can be used to ensure that the power-assisted motor 911 outputs low noise at a high rotating speed.

Referring to fig. 1 to 6, a power input unit connected to the power variable speed input assembly is disposed on the power input ring 915, and the power input unit is disposed on an axially extending section of an outer end surface of the power input ring 915; a first inner support 84 is arranged in the first shell 81, and the first inner support 84 is connected with the first shell 81 through bolts; the axial extension of the booster input ring gear 915 is supported in the first inner support 84 through a bearing, the stators of the first planet carrier 912 and the booster motor 911 are respectively connected with the second housing 82 through bolts, and the end part of the motor shaft 9111 is supported on the inner wall of the second housing 82 through a bearing.

Referring to fig. 1 to 4, the power-assisted input unit in this embodiment is a power-assisted input gear 916, the power-assisted variable-speed input assembly includes a motor input gear 53, an idler gear assembly 92 connected between the power-assisted input gear 916 and the motor input gear 53 is disposed on the first inner support 84, and a notch 841 for connecting the power-assisted input gear 916 and the idler gear assembly 92 is formed on the first inner support 84; the idler wheel assembly 92 is arranged to enable the overall size of the motor to be small; in other alternative embodiments, the idler gear assembly 92 may be omitted if the power input unit is a synchronizing wheel, or if the power input unit and the motor input gear 53 are both sprockets.

Referring to fig. 4 to 6, a rotation-change magnetic steel fixing seat 918 is arranged at the end of the motor shaft 9111, rotation-change magnetic steel 919 is embedded in the rotation-change magnetic steel fixing seat 918, a rotation-change control plate 917 opposite to the rotation-change magnetic steel 919 is arranged on an end plate of the first planet carrier 912, and the rotation speed of the motor shaft 9111 can be measured by matching the rotation-change magnetic steel 919 with the rotation-change control plate 917; in alternative embodiments, the rotational speed of the motor shaft 9111 can be measured in other ways, and is not limited herein.

Referring to fig. 1, 2, 7 and 8, the pedal power input assembly includes a pedal input gear 933, a central shaft 931 is arranged in the middle of the pedal input gear 933, and the central shaft 931 is in linkage fit with the pedal input gear 933; the driving power output assembly comprises an output gear 934 which is supported on a central shaft 931 in a rolling mode, the output gear 934 is connected with a toothed disc 938, the toothed disc 938 is sleeved on an axial extension section of the output gear 934, and an output spline 935 which is matched with the toothed disc 938 is arranged on the axial extension section; the middle shaft 931 is inserted through the first housing 81 and the second housing 82 at both ends thereof, respectively, for connecting pedals of the bicycle, and the chain wheel 938 is located outside the housings for connecting a chain of the bicycle.

Referring to fig. 7, in the present embodiment, the central shaft 931 and the pedal input gear 933 are in one-way linkage fit, specifically, a first one-way clutch assembly 936 is disposed between the central shaft 931 and the pedal input gear 933, and the first one-way clutch assembly 936 realizes one-way transmission of the central shaft 931 and the pedal input gear 933 along the circumferential direction; the first one-way clutch assembly 936 comprises a sleeve 932 sleeved on the central shaft 931, and the sleeve 932 is matched with the central shaft 931 through a key slot to realize circumferential linkage; a ratchet pawl component is arranged between the sleeve 932 and the pedal input gear 933, so that the pedal input gear 933 can be driven to rotate by the ratchet pawl component when the central shaft 931 forwards in a forward rotation mode, and the pedal input gear 933 cannot be driven to rotate by the central shaft 931 in a reverse rotation mode; in other alternative embodiments, the central shaft 931 and the foot input gear 933 can be fixedly connected, and then the coordinated operation is realized through electronic control.

Referring to fig. 1, 2, 7 and 8, in the present embodiment, the bottom bracket mechanism 93 further includes a torque sensing component 937 and a rotational speed sensing component, and a second inner bracket 85 which is matched with the torque sensing component 937 is connected in the second housing 82 through a bolt; moment sensing subassembly 937 can the perception pedal input force to give the controller with signal transmission, corresponding rotational speed of trampling can be sensed to rotational speed sensing subassembly simultaneously, and the controller combines corresponding signal back this moment, sends the signal and gives helping hand actuating mechanism 91, and control helping hand actuating mechanism 91 starts.

Referring to fig. 1, 2, 9 and 10, for the shifting mechanism, specifically, the shift adjusting assembly includes a shift shaft barrel 1 inserted through the middle of the shift input assembly, the shift executing assembly and the shift output assembly; in this embodiment, two ends of the shift shaft cylinder 1 are respectively abutted against the first housing 81 and the second housing 82 to realize axial limiting of the shift shaft cylinder 1, and meanwhile, the shift shaft cylinder 1 and the first housing 81 are matched through a key slot to limit rotation of the shift shaft cylinder 1, so as to realize circumferential limiting of the shift shaft cylinder 1, and then the shift shaft cylinder 1 is fixed relative to the first housing 81 and the second housing 82; the variable speed input assembly comprises a middle shaft input sleeve 51 and a sliding sleeve 61, the sliding sleeve 61 is in circumferential linkage fit with the middle shaft input sleeve 51, and two first bearings 55 are arranged between the middle shaft input sleeve 51 and the variable speed shaft barrel 1; in this embodiment, the outer side wall of the middle shaft input sleeve 51 is provided with a plurality of key slots 56 arranged along the axial direction, the plurality of key slots 56 are uniformly distributed along the circumferential direction, the inner side wall of the sliding sleeve 61 is provided with a spline 613 matched with the key slots 56, and the spline 613 is matched with the key slots 56 to realize circumferential linkage of the middle shaft input sleeve 51 and the sliding sleeve 61.

Referring to fig. 9, the pedal input assembly includes a middle shaft input gear 52 disposed on an outer side wall of the middle shaft input sleeve 51 and linked with the middle shaft input gear along a circumferential direction, in this embodiment, the middle shaft input gear 52 and the middle shaft input sleeve 51 are integrally formed; the variable speed input assembly comprises a motor input gear 53 which is arranged on the outer side wall of the middle shaft input sleeve 51 and is in one-way linkage with the middle shaft input sleeve along the circumferential direction, a second one-way clutch assembly 54 is arranged between the motor input gear 53 and the middle shaft input sleeve 51, and the second one-way clutch assembly 54 is a one-way needle bearing in the embodiment; by providing the second one-way clutch assembly 54, the rotational speed of the motor input gear 53 can be transmitted to the bottom bracket shaft input sleeve 51, while the rotational speed of the bottom bracket shaft input gear 52 cannot be transmitted to the motor input gear 53.

Referring to fig. 9 and 12, the shift execution assembly includes a variable speed ring gear 62, a second planet carrier 63, multiple planet gears 64 and N shift sun gears matched with the multiple planet gears 64, and a second planet shaft 635 penetrating through the multiple planet gears 64 is arranged on the second planet carrier 63; an inner tooth portion 622 matched with the multiple planet gear 64 is arranged on the inner side wall of the variable-speed gear ring 62, and in the embodiment, the inner tooth portion 622 and the variable-speed gear ring 62 are fixed in an interference fit mode and can be integrally formed; in the embodiment, the multiple planetary gear 64 is a triple planetary gear, and includes a first planetary gear 641, a second planetary gear 642, and a third planetary gear 643, where the internal gear 622 is engaged with the second planetary gear 642; the number of the shift sun gears is three, and the shift sun gears include a first sun gear 651 meshing with the first planetary gear 641, a second sun gear 652 meshing with the second planetary gear 642, and a third sun gear 653 meshing with the third planetary gear 643.

Referring to fig. 9, the first sun gear 651, the second sun gear 652 and the third sun gear 653 are all sleeved on the transmission shaft cylinder 1, the end of the second planet carrier 63 is embedded with the supporting end plate 631 contacting with the first sun gear 651, and meanwhile, the outer sidewall of the transmission shaft cylinder 1 forms a step for limiting the supporting end plate 631; a second spring 66 is sleeved on the speed change shaft barrel 1, one end of the second spring 66 is in contact with the third sun gear 653, and the other end of the second spring 66 is in contact with an elastic retainer ring on the speed change shaft barrel 1; the supporting end plate 631 is matched with the second spring 66 to perform axial elastic limiting on the three shifting sun gears, so that loosening abnormal sound can be avoided.

Referring to fig. 9 and 10, the sliding sleeve 61 is capable of circumferential interlocking engagement with the shift ring gear 62, and the sliding sleeve 61 includes a sleeve portion 611 and a ring plate portion 612 in the present embodiment; the ring plate portion 612 is provided with a plurality of first engaging teeth 614 on the end surface, the shift ring gear 62 is provided with a second engaging tooth 621 engaged with the first engaging tooth 614 on the inner end surface, and the first engaging tooth 614 and the second engaging tooth 621 are engaged to realize circumferential linkage of the sliding sleeve 61 and the shift ring gear 62.

Referring to fig. 9, 10 and 12, the speed change output assembly includes a speed change output sleeve 71 in one-way linkage fit with the second planet carrier 63, two second bearings 73 are arranged between the speed change output sleeve 71 and the speed change shaft barrel 1, and a speed change output gear 72 is arranged on the outer side wall of the speed change output sleeve 71; in the embodiment, the variable speed output gear 72 and the variable speed output sleeve 71 are fixed in an interference fit manner, and simultaneously, the variable speed output gear and the variable speed output sleeve can be integrally formed; a third one-way clutch assembly is arranged between the transmission output sleeve 71 and the second planet carrier 63, and in the embodiment, the third one-way clutch assembly comprises a plurality of pawl assemblies 634 arranged on the outer side wall of the second planet carrier 63 and ratchet parts 75 arranged on the inner side wall of the transmission output sleeve 71, and the pawl assemblies 634 comprise pawls and elastic collars; in this embodiment, the ratchet portion 75 and the speed change output sleeve 71 are fixed in an interference fit manner, and at the same time, they may be integrally formed; in this embodiment, the end of the second planet carrier 63 away from the support end plate 631 is connected to the transmission output sleeve 71 through a bushing 632, wherein the bushing 632 is fixed to the second planet carrier 63 by interference fit, and the bushing 632 is in contact fit with the transmission output sleeve 71.

Referring to fig. 9 and 13, the shift adjusting assembly includes a first slider 21, an end of the first slider 21 protrudes from an outer side wall of the shift shaft barrel 1 and is capable of moving in an axial direction relative to the shift shaft barrel 1; the first sliding block 21 can stop the three gear shifting sun gears in sequence along the axial direction, so that 1 st to 3 rd gear adjustment of the speed changing mechanism is realized; the first sun gear 651, the second sun gear 652 and the third sun gear 653 are respectively provided with a first stopper groove 6511, a second stopper groove 6521 and a third stopper groove 6531 which are matched with the first slider 21; in the present embodiment, the first stopper groove 6511 and the second stopper groove 6521 are provided on the inner side walls of the first sun gear 651 and the second sun gear 652, respectively, and the third stopper groove 6531 penetrates the wall thickness of the third sun gear 653.

Referring to fig. 9, 10 and 13, when the first slider 21 is engaged with the first locking groove 6511 to lock the first sun gear 651, the power is output to the shift output sleeve 71 through the bottom bracket input sleeve 51, the sliding sleeve 61, the shift ring gear 62, the second planet carrier 63 and the second one-way clutch assembly; in this embodiment, the number of teeth of the first sun gear 651, the second sun gear 652 and the third sun gear 653 decreases sequentially, and then the first slider 21 shifts up sequentially in the process of moving rightward, the first sun gear 651 stops as the first gear, the second sun gear 652 stops as the second gear, and the third sun gear 653 stops as the third gear; the ratios of the output speed to the input speed of the first gear, the second gear and the third gear are all less than 1, the second gear is greater than the first gear, and the third gear is greater than the second gear.

Referring to fig. 9 and 10, in the present embodiment, the middle axle input sleeve 51 and the sliding sleeve 61 are coupled in a circumferential direction by the splines 613 and the key slots 56, and the length of the key slots 56 is set in an axial direction, so that the sliding sleeve 61 can move in the axial direction relative to the middle axle input sleeve 51; the gear shifting execution assembly further comprises a first spring 67 for applying elastic thrust F1 to the gear shifting ring gear 62, in the embodiment, the first spring 67 is sleeved on the sleeve portion 611, the sleeve portion 611 and the first spring 67 are supported and provided with a spring bushing 671 with an L-shaped cross section, and the spring bushing 671 is in end surface contact with the middle shaft input gear 52 to realize axial limit; in this embodiment, the first spring 67 is a conical spring, and the outer end wall of the shift ring gear 62 is provided with a notch that is engaged with the large end of the first spring 67.

Referring to fig. 9 and 10, the ring plate portion 612 is in contact with the inner end surface of the shift ring gear 62, and can axially limit the shift ring gear 62 and limit the shift ring gear 62 from being displaced by the elastic thrust F1; the gear shifting adjusting assembly further comprises a second sliding block 41, the second sliding block 41 can axially limit the sliding sleeve 61, and the sliding sleeve 61 is limited from displacing under the action of the elastic thrust F1; sliding sleeve 61 inside wall is provided with in this embodiment with second slider 41 complex draw-in groove, second slider 41 inlays in the draw-in groove to can carry out axial spacingly to sliding sleeve 61.

Referring to fig. 9 to 12, when the second slider 41 moves rightward, the sliding sleeve 61 is driven to move axially, the shift ring gear 62 moves rightward in the axial direction under the action of the elastic thrust F1, and the shift ring gear 62 can move to contact with the shift output sleeve 71; in the embodiment, the end surface of the speed changing gear ring 62 is provided with a plurality of fifth tooth teeth 623, and the end surface of the speed changing output sleeve 71 is provided with a sixth tooth 74 matched with the fifth tooth teeth 623; after the speed change gear ring 62 is contacted with the speed change output sleeve 71, the fifth tooth teeth 623 are matched with the sixth tooth teeth 74, so that the speed change gear ring 62 and the speed change output sleeve 71 realize circumferential linkage, and the 4 th gear adjustment of the speed change mechanism is realized on the basis of the 3 rd gear.

Referring to fig. 9 to 12, after the end of the speed change gear ring 62 and the speed change output sleeve 71 are clutched to realize circumferential linkage, at this time, power is output to the speed change output sleeve 71 through the middle shaft input sleeve 51, the sliding sleeve 61 and the speed change gear ring 62, and the ratio of the output speed to the input speed is equal to 1, so that a fourth-gear speed change is formed; in the fourth gear, the first slider 21 stops the third sun gear 653, the speed-change ring gear 62 drives the second planet carrier 63 to rotate, but the rotation speed of the second planet carrier 63 is lower than that of the speed-change ring gear 62, the pawl assembly 634 on the second planet carrier 63 is in an overrunning clutch state with the ratchet part 75 on the speed-change output sleeve 71, and the second planet carrier 63 does not output power.

Referring to fig. 9 and 10, after the shift ring gear 62 contacts the shift output sleeve 71, the second slider 41 pushes the sliding sleeve 61 to move continuously, and the sliding sleeve 61 can move to contact with the second planet carrier 63; in this embodiment, the end surface of the annular plate portion 612 is provided with a plurality of third teeth 615, and the end surface of the second planet carrier 63 is provided with a fourth tooth 633 matched with the third teeth 615; after the sliding sleeve 61 is contacted with the second planet carrier 63, the third meshing teeth 615 and the fourth meshing teeth 633 are matched to realize the circumferential linkage of the sliding sleeve 61 and the second planet carrier 63, and at the moment, the circumferential linkage matching relation of the sliding sleeve 61 and the speed-changing gear ring 62 is released, and on the basis of the 4 th gear, the 5 th gear adjustment of the speed-changing mechanism is realized.

Referring to fig. 9 to 11, after the end of the sliding sleeve 61 and the second planet carrier 63 are clutched to realize circumferential linkage, the circumferential linkage matching relationship between the sliding sleeve 61 and the speed change ring gear 62 is released, i.e. the first tooth 614 and the second tooth 621 are separated, at this time, power is output to the speed change output sleeve 71 through the middle shaft input sleeve 51, the sliding sleeve 61, the second planet carrier 63 and the speed change ring gear 62, and the ratio of the output speed to the input speed is greater than 1, so that a fifth gear speed change is formed.

Referring to fig. 9 to 12, in the fifth gear, the first slider 21 stops the third sun gear 653, the sliding sleeve 61 rotates the second carrier 63, but the rotation speed of the second carrier 63 is lower than that of the shift ring gear 62, the pawl assembly 634 on the second carrier 63 is in an overrunning clutch state with the ratchet part 75 on the shift output sleeve 71, and the second carrier 63 does not output power.

Referring to fig. 9 to 12, the first slider 21 is capable of reciprocating, and can adjust the transmission mechanism from 6 th to 7 th gears on the basis of the 5 th gear; in the fifth gear state, the first slider 21 moves to stop the second sun gear 652, and a sixth gear shift is performed; at this time, power is output to the variable speed output sleeve 71 through the middle shaft input sleeve 51, the sliding sleeve 61, the second planet carrier 63 and the variable speed gear ring 62, the ratio of the output speed to the input speed is greater than 1, and the ratio of the sixth gear is greater than the ratio of the fifth gear; meanwhile, the sliding sleeve 61 drives the second planet carrier 63 to rotate, but the rotation speed of the second planet carrier 63 is lower than that of the speed change ring gear 62, the pawl assembly 634 on the second planet carrier 63 is in an overrunning clutch state with the ratchet part 75 on the speed change output sleeve 71, and the second planet carrier 63 does not output power.

Referring to fig. 9 to 12, in the sixth gear state, the first slider 21 is moved to stop the first sun gear 651, and a seventh gear shift is performed; at this time, power is output to the variable speed output sleeve 71 through the middle shaft input sleeve 51, the sliding sleeve 61, the second planet carrier 63 and the variable speed gear ring 62, the ratio of the output speed to the input speed is greater than 1, and the ratio of the seventh gear is greater than the ratio of the sixth gear; meanwhile, the sliding sleeve 61 drives the second planet carrier 63 to rotate, but the rotation speed of the second planet carrier 63 is lower than that of the speed change ring gear 62, the pawl assembly 634 on the second planet carrier 63 is in an overrunning clutch state with the ratchet part 75 on the speed change output sleeve 71, and the second planet carrier 63 does not output power.

Referring to fig. 9, 14 and 15, in the process from the first gear to the third gear, the first slider 21 moves forward twice, in the process from the third gear to the fifth gear, the first slider 21 remains stationary, and in the process from the fifth gear to the seventh gear, the first slider 21 moves backward twice to return, so that the first slider 21 performs a reciprocating motion once in a shift period; the second slider 41 remains stationary during the first gear stage to the third gear stage, the second slider 41 moves forward twice during the third gear stage to the fifth gear stage, and the second slider 41 remains stationary during the fifth gear stage to the seventh gear stage, so that the second slider 41 moves in one direction during one shift cycle.

Referring to fig. 16, 17 and 19, a reciprocating drive rod is provided in the shift shaft barrel 1 to be movable in the axial direction relative thereto; the first slide block 21 is borne on the reciprocating drive rod, and the first slide block and the reciprocating drive rod are in elastic linkage fit along the axial direction; in the embodiment, the reciprocating driving rod comprises a reciprocating driving part 252 and a reciprocating sleeve part 251, an axial extension 2521 is arranged at the end of the reciprocating driving part 252, the reciprocating sleeve part 251 is sleeved on the axial extension 2521, and a limit rod 253 is arranged between the two parts in a penetrating manner; the reciprocating sleeve portion 251 and the shift shaft barrel 1 are respectively provided with a first limit sliding groove 2511 and a second limit sliding groove 11 which are matched with the first slide block 21; the first limit sliding slot 2511 and the second limit sliding slot 11 can provide axial displacement for the first slider 21 on one hand, and can limit the rotation of the reciprocating driving rod on the other hand.

Referring to fig. 17 and 13, the second sun gear 652 needs to rotate to a certain angle, and the first slider 21 can be inserted into the second stopper groove 6521; therefore, the first sliding block 21 and the reciprocating driving rod are in elastic linkage instead of fixed linkage along the axial direction, and the situation of clamping can be avoided.

Referring to fig. 17 and 19, a guide rod 22 penetrating through the first slider 21 is arranged in the reciprocating driving rod, and a guide rod stopper 23 contacting with the first slider 21 is arranged on the guide rod 22; in this embodiment, one end of the guide rod 22 is embedded in the end wall of the axially extending section 2521, and the other end is embedded in the end wall of the guide rod limiting block 23; a third spring 24 for applying elastic thrust F2 to the guide rod limiting block 23 and a fourth spring 26 for applying elastic thrust F3 to the first slider 21 are arranged in the reciprocating driving rod, and the first slider 21 can be kept in a relatively stable state relative to the reciprocating driving rod under the action of the elastic thrust F2 and the elastic thrust F3; in the present embodiment, a positioning stop column 2512 contacting with the end of the third spring 24 is disposed in the reciprocating sleeve portion 251, and one end of the fourth spring 26 away from the first slider 21 abuts against the axial extension 2521.

Referring to fig. 17 and 13, when the first slider 21 moves from the first stopper groove 6511 to the second stopper groove 6521, the reciprocating drive rod moves rightward by a certain amount, the first slider 21 is blocked from contacting the end surface of the second sun gear 652, the fourth spring 26 is compressed, the elastic pushing force F3 becomes large, and when the first slider 21 is aligned with the second stopper groove 6521, the first slider 21 is inserted into the second stopper groove 6521 by the elastic pushing force F3 and is kept in a stable state; when the first slider 21 moves from the second stopper groove 6521 into the first stopper groove 6511, the reciprocating drive lever moves a certain amount of displacement leftward, the first slider 21 is blocked from contacting the end face of the first sun gear 651, the third spring 24 is compressed, the elastic pushing force F2 becomes large, and when the first slider 21 is aligned with the first stopper groove 6511, the first slider 21 is inserted into the first stopper groove 6511 by the elastic pushing force F2 and is maintained in a stable state.

Referring to fig. 17 and 19, the reciprocating drive rod is sleeved with a drive sleeve 3, and the axial position of the drive sleeve 3 relative to the shift shaft tube 1 is constant. In the embodiment, the driving sleeve 3 and the speed change shaft barrel 1 are axially limited through a step spigot; the first driving pin 27 embedded in the outer side wall of the reciprocating driving portion 252 is arranged on the driving sleeve 3 in a penetrating mode, the first pin hole 34 matched with the first driving pin 27 is formed in the driving sleeve 3, and the reciprocating sliding groove matched with the first driving pin 27 is formed in the outer side wall of the reciprocating driving portion 252.

Referring to fig. 19, the reciprocating sliding slots include a first sliding slot 2524 and a third sliding slot 2522, and two second sliding slots 2523, the second sliding slots 2523 are in a spiral segment shape, the two second sliding slots 2523 form a junction, and one end of each of the two second sliding slots 2523 is communicated with the first sliding slot 2524, and the other end of each of the two second sliding slots 2523 is communicated with the third sliding slot 2522.

Referring to fig. 14, 15, 17 and 19, when the driving sleeve 3 rotates, the reciprocating driving rod can be driven to move axially by the reciprocating chute; when the first driving pin 27 is in the first sliding slot 2524, the reciprocating driving rod is not moved in the axial direction, and the first sliding block 21 advances twice in the process that the first driving pin 27 enters the third sliding slot 2522 through the second sliding slot 2523, so that the speed change from the first gear to the third gear is realized; during the gear shifting from the third gear to the fifth gear, the first driving pin 27 is located in the third sliding slot 2522, the reciprocating driving rod is not moved along the axial direction, and when the first driving pin 27 enters the first sliding slot 2524 through the other second sliding slot 2523, the first slider 21 is retracted twice, so that the gear shifting from the fifth gear to the seventh gear is realized.

Referring to fig. 9 and 13, a push plate 42 axially linked with the second slider 41 is embedded on the shift shaft cylinder 1, and a third limiting chute 12 matched with the push plate 42 is formed on the shift shaft cylinder 1; the third limiting chute 12 provides axial displacement for the push plate 42 on one hand, and can limit the rotation of the push plate 42 on the other hand; in this embodiment, the second slider 41 is disc-shaped, the push plate 42 is provided with a claw 43 for clamping the second slider 41 therein, and the claw 43 realizes axial linkage of the second slider 41 and the push plate 42; in the present embodiment, the second slider 41 has elasticity in the radial direction, and the second slider 41 is compressed when being installed between the sleeve portion 611 and the push plate 42, so that on one hand, stability of the axial linkage between the second slider 41 and the sleeve portion 611 can be ensured, and on the other hand, installation of the second slider 41 is also facilitated.

Referring to fig. 16 to 18, a second driving pin 44 embedded in the outer side wall of the driving sleeve 3 penetrates through the push plate 42, and a push groove matched with the second driving pin 44 is formed in the outer side wall of the driving sleeve 3; the push grooves in this embodiment include a first push groove 31 and a third push groove 33, and a second push groove 32 connected between the first push groove 31 and the third push groove 33, and the second push groove 32 is in a spiral segment shape.

Referring to fig. 14, 15, 16 and 18, in the present embodiment, the second slider 41 can be further driven to move axially by the push slot during the rotation of the driving sleeve 3, and during the shifting from the first gear to the third gear, the second driving pin 44 is located in the first push slot 31, and the second slider 41 is not moved axially; in the process that the second driving pin 44 moves to the third pushing groove 33 through the second pushing groove 32, the second slider 41 moves forward twice, and the gear shift from the third gear to the fifth gear is realized; during the gear shifting from the fifth gear to the seventh gear, the second driving pin 44 is located in the third push groove 33, and the second slider 41 is not moved in the axial direction.

Referring to fig. 17, 20 and 1, the speed changing mechanism in this embodiment further includes a shift adjusting driving assembly for controlling the driving sleeve 3 to rotate, the shift adjusting driving assembly includes a gear box 945, a shift motor 941 is disposed on the gear box 945, and a motor gear 942 located in the gear box 945 is sleeved on a rotating shaft of the shift motor 941; wherein, a gear box shell 83 matched with the gear box 945 is formed on the first shell 81, thereby facilitating the installation and the overhaul; a shift drive gear 944 and a reduction gear set 943 carried between the motor gear 942 and the shift drive gear 944 are provided within the gear box 945; when the shift drive gear 944 is engaged with and disengaged from the end of the drive sleeve 3 to realize circumferential linkage, the shift motor 941 can control the drive sleeve 3 to rotate through the motor gear 942, the reduction gear set 943 and the shift drive gear 944; in this embodiment, automatic shifting is realized by forward rotation or reverse rotation of the shift motor 941, and manual shifting and speed changing can be realized by pulling a cord or the like.

The working principle is as follows:

the middle motor is arranged on a power-assisted bicycle, a pedal is connected with a middle shaft 931, and a chain on a rear wheel is connected with a chain wheel 938.

When riding, the foot pedal is used for enabling the middle shaft 931 to rotate, the middle shaft 931 drives the foot pedal input gear 933 to rotate through the first one-way clutch assembly 936, the foot pedal input gear 933 inputs the rotating speed to the speed change mechanism through the middle shaft input gear 52, then the speed change mechanism outputs a certain rotating speed to the output gear 934 through the speed change output gear 72, the output spline 935 on the output gear 934 is connected with the chain wheel 938 and then is transmitted to the rear wheel through a chain, and at the moment, the input and the output of the side of the human foot pedal middle shaft 931 are completed.

When the rear wheel is started, the user and the moped are determined to need to step on the middle shaft 931 if the user and the moped need to move, the torque sensing assembly 937 and the rotating speed sensing assembly transmit signals to the controller, and the controller sends signals to control the power-assisted motor 911 to be started.

After the power-assisted motor 911 is started, a motor shaft 9111 rotates, a motor shaft sun gear 9112 drives a power-assisted input gear ring 915 to rotate through an input planet gear 9131 and an output planet gear 9132, a power-assisted input gear 916 which is of an integrated structure with the power-assisted input gear ring 915 outputs a certain rotating speed to an idler gear component 92 and then to a motor input gear 53, and the motor input gear 53 drives a middle shaft input sleeve 51 to rotate through a second one-way clutch component 54; the speed change mechanism is divided into two paths, one path is input into the speed change mechanism, the other path is input into a pedal input gear 933 through a middle shaft input gear 52, the pedal input gear 933 cannot output the rotating speed to a middle shaft 931 through a first one-way clutch assembly 936, only the speed change mechanism can be input, the speed change mechanism outputs a certain rotating speed to an output gear 934 through a speed change output gear 72, an output spline 935 on the output gear 934 is connected with a chain wheel 938, and the output spline is output to a rear wheel through a chain to drive the power-assisted bicycle to rotate.

The input and the output of the power-assisted motor 911 side are completed, and the combination of the power-assisted motor 911 and the human is that the force of the human and the power-assisted motor 911 is simultaneously output to the rear wheel to drive the power-assisted bicycle to run; the output ratio of a person and the power-assisted motor 911 can be controlled through the control of a controller program, and meanwhile, automatic gear shifting and speed changing are realized through the gear shifting motor 941, so that a rider can obtain smoother and more comfortable riding experience; more importantly, the speed change enables the use working condition of the power-assisted motor 911 to be in a high-efficiency energy-saving state to work all the time, so that the power-assisted bicycle has longer endurance mileage.

The control system of the centrally-mounted motor can acquire various signals including wheel speed signals, torque signals, pedal frequency signals, gear signals of a speed change mechanism, gear adjusting signals, battery information, motor output and the like, the battery information includes current, voltage, temperature, residual capacity and total capacity, and the various signals are integrated into a man-machine interaction system. Control system can keep off the position signal according to gear change mechanism and can know mechanical transmission ratio in real time, can keep off the effective value that moment of regulation input according to the gear change mechanism of difference, adjusts and steps on the duty cycle of signal to motor output frequently to effectively solve the interrupt of riding and step on empty problem, promote to ride and experience.

Example 2:

referring to fig. 21, based on embodiment 1, the present embodiment differs from embodiment 1 in that: in this embodiment, the first spring 67 is sleeved on the middle shaft input sleeve 51, and a first plane bearing component 672 is arranged between the first spring 67 and the speed-changing gear ring 62; the first planar bearing assembly 672 comprises balls, a retainer and a bearing bracket, the bearing bracket also serves as a raceway for the balls, and the balls are in contact with the outer end face of the speed change ring gear 62; the first spring 67 has one end in contact with the end face of the bottom bracket input gear 52 and one end in contact with the bearing bracket, and its elastic urging force F1 is applied to the shift ring gear 62 through the bearing bracket and the roller.

Referring to fig. 22, in the present embodiment, a second flat bearing assembly is disposed between the second slider 41 and the sleeve portion 611, and a spigot 616 engaged with the second flat bearing assembly is disposed on the inner side wall of the sleeve portion 611; the second slider 41 axially limits the sleeve portion 611 by means of the second flat bearing assembly and the spigot 616, and restricts the displacement of the sleeve portion 611 under the action of the elastic thrust F1. The second planar bearing assembly in this embodiment includes a planar bearing bracket 682 and two sets of ball cage assemblies 683, the planar bearing bracket 682 includes two parts, the two sets of ball cage assemblies 683 are covered therein, and the two sets of ball cage assemblies 683 are respectively located at two sides of the second slider 41; the ball is in contact with the plane bearing bracket 682 and the second slider 41, and the plane bearing bracket 682 is matched with the spigot 616, so that the second slider 41 can axially limit the sleeve part 611; in this embodiment, the flat bearing bracket 682 is provided with a fifth spring 681, and the inner side wall of the sleeve portion 611 is provided with a bayonet 617 which is matched with the end of the fifth spring 681, so that the second slider 41 can elastically push the sleeve portion 611 through the second flat bearing assembly and the fifth spring 681, thereby driving the sleeve portion 611 to move in the axial direction.

Referring to fig. 23, in the present embodiment, the middle axle input sleeve 51 is sleeved on the sleeve portion 611, the key slot 56 is disposed on the inner side wall of the middle axle input sleeve 51, and the spline 613 is disposed on the outer side wall of the sleeve portion 611.

Referring to fig. 24, the third stopper groove 6531 is provided on the inner sidewall of the third sun gear 653 without penetrating the wall thickness thereof in this embodiment.

Referring to fig. 25 and 26, in the present embodiment, the second slider 41 is annular and is integrally formed with the push plate 42, so that the two can be axially linked; in the present embodiment, the third bearing 35 is provided between the driving sleeve 3 and the shift shaft barrel 1, so that the driving sleeve 3 can rotate and the relative position of the driving sleeve 3 and the shift shaft barrel 1 along the axial direction is unchanged; the reciprocating driving rod 25 is integrally formed in the embodiment, wherein a second retaining column 255 contacting with the end of the third spring 24 and a first retaining column 254 contacting with the end of the fourth spring 26 are arranged in the reciprocating driving rod 25; meanwhile, in the present embodiment, the third spring 24 contacts with the first slider 21, the fourth spring 26 contacts with the guide rod stopper 23, and the guide rod stopper 23 and the guide rod 22 are integrally formed.

Claims

1. A multi-gear variable-speed adjustable centrally-mounted motor is characterized by comprising:

2. The mid-set multi-speed adjustable electric machine according to claim 1, wherein: the pedal power input assembly comprises a pedal input gear, a middle shaft is arranged in the middle of the pedal input gear, and the middle shaft is in linkage fit with the pedal input gear; the driving power output assembly comprises an output gear which is supported on the middle shaft in a rolling mode, and the output gear is connected with a chain wheel.

3. The mid-set multi-speed adjustable electric machine according to claim 1, wherein: the power-assisted input assembly comprises a first planet carrier, a plurality of first planet wheels and a power-assisted input gear ring, and a power-assisted input unit connected with the power-assisted variable-speed input assembly is arranged on the power-assisted input gear ring; the power assisting motor comprises a motor shaft, and a motor shaft sun gear matched with the first planet gear is arranged on the motor shaft.

4. The mid-set multi-speed adjustable electric machine of claim 3, wherein: the first planet wheel comprises an input planet wheel and an output planet wheel which are coaxially linked, wherein the input planet wheel is meshed with a sun wheel of a motor shaft, and the output planet wheel is meshed with a power-assisted input gear ring.

5. The mid-set multi-speed adjustable electric machine of claim 3, wherein: the power-assisted input unit is a power-assisted input gear, the power-assisted variable-speed input assembly comprises a motor input gear, and an idler gear assembly is arranged between the power-assisted input gear and the motor input gear.

6. The mid-set multi-speed adjustable electric machine according to claim 1, wherein: the pedal variable-speed input assembly comprises a middle shaft input sleeve, and a middle shaft input gear is arranged on the outer side wall of the middle shaft input sleeve in a linkage manner; the power-assisted variable-speed input assembly comprises a motor input gear which is sleeved on the middle shaft input sleeve and is in one-way linkage with the middle shaft input sleeve.

7. The mid-set multi-speed adjustable electric machine according to claim 1, wherein: the variable speed input assembly comprises a middle shaft input sleeve and a sliding sleeve, and the sliding sleeve and the middle shaft input sleeve are in circumferential linkage fit;

8. The mid-set multi-speed adjustable electric machine of claim 7, wherein: the sliding sleeve can also move axially relative to the middle shaft input sleeve;

9. The mid-set multi-speed adjustable electric machine of claim 8, wherein: after the variable-speed gear ring is connected with the variable-speed output sleeve, the second sliding block can push the sliding sleeve to move continuously, and the sliding sleeve can move to be contacted with the second planet carrier;

10. The mid-set multi-speed adjustable electric machine of claim 9, wherein: the first sliding block can reciprocate, and on the basis of the N +2 th gear, the N +3 th-2N +1 th gear adjustment of the speed change mechanism can be achieved.

11. The mid-set multi-speed adjustable electric machine of claim 10, wherein: the gear shifting adjusting assembly comprises a gear shifting shaft cylinder which is arranged in the middle of the gear shifting input assembly, the gear shifting executing assembly and the gear shifting output assembly in a penetrating mode, and a reciprocating driving rod which can move relative to the gear shifting shaft cylinder in the axial direction is arranged in the gear shifting shaft cylinder; the first sliding block is borne on the reciprocating driving rod and is in elastic linkage fit with the reciprocating driving rod along the axial direction; and the reciprocating driving rod and the speed changing shaft cylinder are respectively provided with a first limiting sliding groove and a second limiting sliding groove which are matched with the first sliding block.

12. The mid-set multi-speed adjustable electric machine of claim 11, wherein: the reciprocating driving rod is sleeved with a driving sleeve, and the driving sleeve is unchanged along the axial position relative to the speed change shaft barrel; the driving sleeve is provided with a first driving pin embedded in the outer side wall of the reciprocating driving rod in a penetrating mode, and the outer side wall of the reciprocating driving rod is provided with a reciprocating chute matched with the first driving pin.

13. The mid-set multi-speed adjustable electric machine of claim 12, wherein: a push plate which is axially linked with the second slide block is embedded on the speed changing shaft cylinder, and a third limiting sliding groove matched with the push plate is formed in the speed changing shaft cylinder; the push plate is provided with a second driving pin embedded in the outer side wall of the driving sleeve in a penetrating mode, and the outer side wall of the driving sleeve is provided with a pushing groove matched with the second driving pin.

14. The mid-set multi-speed adjustable electric machine of claim 12, wherein: the gear shifting adjusting assembly is connected with a gear shifting adjusting driving assembly used for controlling the driving sleeve to rotate.