E-bike two-gear hub electric drive assembly

Abstract

An E-bike two-gear hub electric drive assembly comprises a motor, a planet wheel system, a one-way bearing and a shell, a rotating shaft of the motor is connected with the planet wheel system, the planet wheel system is sleeved with the one-way bearing, a three-stage planet carrier is arranged at the rear end of the planet wheel system, and the one-way bearing system is sleeved with the shell; a first outer shaft is integrally formed on an end cover of the motor, a second outer shaft is integrally formed on the third-stage planet carrier, and the first outer shaft and the second outer shaft penetrate through and extend out of the two ends of the shell respectively. The design layout of three planetary gear trains, two one-way bearings and one motor is adopted, the structure is compact, the reduction ratios are respectively 13.03 and 52.73, and the torque increasing range is wide. A shell of the speed reducer is directly connected with a flywheel of a rear wheel, the speed reducer is driven by a three-stage planetary gear train and a motor, power transmission and power separation are achieved through two one-way bearings, stepless speed change can be achieved, and the function of manual driving is reserved while motor driving is conducted. And the motor automatically intervenes to provide power, and the riding experience of the bicycle is reserved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a speed reducer, specifically to a speed reducer for bicycle. BACKGROUND

[0002] With the promotion of environmental protection concept, E-bike is becoming more and more people's daily travel preferred means of transportation in Europe and America. Limited by the bicycle structure space size, the user needs comfort, lightweight, high speed, large torque and low energy consumption seems difficult to meet at the same time. Chinese patent CN 207634627 U discloses a two-speed transmission for car, including a one-way clutch, a dry clutch, a motor and a reducer, the scheme realizes gear shifting through planetary gear train and one-way clutch, dry clutch, but the structure occupies large space, the reduction is small, the torque increase is not high, Chinese patent CN210235231 U discloses a two-speed transmission for two-wheeled vehicle with parallel shaft structure of double one-way bearing, including two one-way bearings and several gear pairs, the scheme realizes gear shifting through the positive and negative installation of two one-way bearings and the positive and negative rotation of input shaft, but the input and output are arranged not on the same axis, the length direction occupies a lot of space, the reduction ratio is lower than the planetary gear train structure under the same tooth number, and the gear structure is of conventional material and conventional tooth, and the noise is difficult to reach a better level. SUMMARY

[0003] The technical problem to be solved by the utility model is: how to set a two-speed electric drive assembly with compact structure and wide torque increase range on the bicycle to balance bicycle travel and mountain cross-country.

[0004] In view of the above problems, the technical scheme provided by the utility model is: an E-bike two-speed hub electric drive assembly, including a motor, a planetary gear system, a one-way bearing and a shell, the rotating shaft of the motor is connected with the planetary gear system, the one-way bearing is sleeved on the planetary gear system, the rear end of the planetary gear system is provided with a three-stage planet carrier, and the shell is sleeved on the one-way bearing system; an outer shaft one is integrally formed on the end cover of the motor, an outer shaft two is integrally formed on the three-stage planet carrier, and the outer shaft one and the outer shaft two respectively pass through and extend out of the two ends of the shell.

[0005] Preferably, the planetary gear system comprises a primary sun gear, a primary planet gear and a primary ring gear, one end of the primary sun gear is connected with the rotating shaft of the motor, the primary sun gear is connected with the primary planet gear in a gear matching mode, and the outer side of the primary planet gear is further connected with the primary ring gear in a gear matching mode.

[0006] Preferably, the planetary gear system further comprises a secondary planet gear, a primary carrier shaft and a secondary ring gear, the primary planet gear is sleeved on the front end of the primary carrier shaft, the outer side of the rear end of the primary carrier shaft is connected with the secondary planet gear in a gear matching mode, and the outer side of the secondary planet gear is further connected with the secondary ring gear in a gear matching mode.

[0007] Preferably, the planetary gear system further comprises a third planetary gear, a second carrier axle and a third ring gear, the second planetary gear is sleeved on the front end of the second carrier axle, and the outer side of the rear end of the second carrier axle is connected with the third planetary gear in gear engagement; the third planetary gear is sleeved on the front end of the outer shaft two, and the outer side of the third planetary gear is further connected with the third ring gear in gear engagement.

[0008] Preferably, the one-way bearing comprises a one-way bearing one and a one-way bearing two, the one-way bearing one is sleeved on the third ring gear, and the one-way bearing two is sleeved on the second carrier axle.

[0009] Preferably, the shell comprises a front shell and a rear shell, the front shell is sleeved on the one-way bearing two, and the rear shell is sleeved on the one-way bearing one.

[0010] Preferably, the frame is further provided, the frame is sleeved on the outer shaft one, the motor, the first ring gear and the second ring gear, bearings are arranged between the front shell and the outer shaft one and between the rear shell and the outer shaft two, the front shell is sleeved on the bearing, and the bearing is sleeved on the frame.

[0011] The beneficial technical effects of the utility model are as follows:

[0012] 1. Three planetary gear systems, two one-way bearings and a motor are arranged, the structure is compact, the speed reduction ratios are 13.03 and 52.73 respectively, and the torque increasing range is wide.

[0013] 2. The input and output are coaxially arranged, are directly driven through the rear wheel hub, are two-gear variable speed through forward and reverse rotation of the motor, and can be used in travel and mountain climbing.

[0014] 3. The reducer shell is directly connected with the rear wheel flywheel, is driven through the third planetary gear system and the motor, power transmission and power separation are realized through the two one-way bearings, stepless variable speed can be realized, the function of manual driving is reserved while the motor is driven, the motor automatically provides power, and the riding experience of the bicycle is reserved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a sectional view of the overall structure of the first embodiment.

[0016] In the figure: stator 1, rotor 2, bearing 3, outer shaft one 4, rotating shaft 6, first sun gear 7, first planetary gear 10, first carrier axle 11, frame 15, second planetary gear 16, third planetary gear 18, second carrier axle 19, outer shaft two 20, third ring gear 21, rear shell 22, one-way bearing one 23, one-way bearing two 26, second ring gear 27, first ring gear 28, front shell 29. DETAILED DESCRIPTION

[0017] The utility model will be further described in connection with the embodiments and the drawings: Embodiment one

[0018] As Figure 1 shown, a two-gear hub motor assembly of an E-bike is also a two-gear hub reducer, the electric drive assembly includes a motor, a planetary gear system, a one-way bearing 3 and a housing. The housing includes a front housing 29 and a rear housing 22, the front housing 29 and the rear housing are fixedly connected together by bolts and can rotate together. The motor is provided with a stator 1, a rotor 2 and a rotating shaft 6, and the front end of the motor is provided with an outer shaft 4, which is integrally formed with a cylindrical shaft by a motor end cover, and the cylindrical shaft extends out of the front end of the front housing 29. The outer shaft 20 is integrally formed with a cylindrical shaft by a three-stage planetary carrier, and the cylindrical shaft of the outer shaft 20 extends out of the rear end of the rear housing 22. Bearings 3 are arranged between the front housing 29 and the outer shaft 4, and bearings 3 are arranged between the rear housing 22 and the outer shaft 20, so that the front housing 29 and the rear housing 22 can rotate relative to the outer shaft 4 and the outer shaft 20 respectively.

[0019] The planetary gear system includes a first sun gear 7, a first planetary gear 10, a first ring gear 28, a second planetary gear 16, a first carrier shaft 11, a second ring gear 27, a third planetary gear 18, a second carrier shaft 19 and a third ring gear 21. The first carrier shaft 11 is integrally formed with the first planetary carrier and the second sun gear, and the second carrier shaft 19 is integrally formed with the second planetary carrier and the third sun gear. One end of the first sun gear 7 is connected with the rotating shaft 6 of the motor, the first sun gear 7 is connected with the first planetary gear 10 through gear matching, and the outer side of the first planetary gear 10 is further connected with the first ring gear 28 through gear matching. The first planetary gear 10 is sleeved on the front end of the first carrier shaft 11, the outer side of the rear end of the first carrier shaft 11 is connected with the second planetary gear 16 through gear matching, and the outer side of the second planetary gear 16 is further connected with the second ring gear 27 through gear matching. The second planetary gear 16 is sleeved on the front end of the second carrier shaft 19, the outer side of the rear end of the second carrier shaft 19 is connected with the third planetary gear 18 through gear matching; the third planetary gear 18 is sleeved on the front end of the outer shaft 20, and the outer side of the third planetary gear 18 is further connected with the third ring gear 21 through gear matching.

[0020] The one-way bearing 3 includes a one-way bearing 23 and a one-way bearing 26, the one-way bearing 23 is sleeved on the third ring gear 21, and the one-way bearing 26 is sleeved on the second carrier shaft 19. The frame 15 is sleeved on the outer shaft 4, the motor, the first ring gear 28 and the second ring gear 27, the front housing 29 is sleeved on the bearing 3, the bearing 3 is sleeved on the frame 15, and the front housing 29 is further sleeved on the one-way bearing 26, and the rear housing 22 is sleeved on the one-way bearing 23.

[0021] In this embodiment, the outer shaft one 4 and the outer shaft two 20 are fixed on the frame at the rear wheel of the bicycle, and the spokes are installed on the front shell 29 and the rear shell 22 of the electric drive assembly, and the other end of the spokes is installed on the rim of the bicycle. The outer shaft one 4 and the outer shaft two 20 are fixed, and the motor drives the planetary wheel system, the one-way bearing 3, the front shell 29 and the rear shell 22 to rotate together with the rear wheel of the bicycle.

[0022] The specific working process of the electric drive assembly is as follows: first, when the motor rotates forward: the rotating shaft 6 of the motor drives the first sun gear 7, the first planetary gear 10, the first carrier wheel shaft 11, the second planetary gear 16, and the second carrier wheel shaft 19 in sequence. The second carrier wheel shaft 19 drives the one-way bearing two 26, the front shell 29, the rear shell 22 and the spokes to rotate, so as to make the rear wheel rotate. At the same time, the second carrier wheel shaft 19 drives the third planetary gear 18, the third gear ring 21 and the one-way bearing one 23 in sequence, and at this time, the one-way bearing one 23 is in reverse slipping state. Second, when the motor reverses: the rotating shaft 6 of the motor drives the first sun gear 7, the first planetary gear 10, the first carrier wheel shaft 11, the second planetary gear 16 and the second carrier wheel shaft 19 in sequence. The second carrier wheel shaft 19 drives the one-way bearing two 26 to rotate, and at this time, the one-way bearing two 26 is in reverse slipping state. At the same time, the second carrier wheel shaft 19 drives the third planetary gear 18, the third gear ring 21, the one-way bearing one 23, the front shell 29, the rear shell 22 and the spokes to rotate, so as to make the rear wheel rotate. The forward and reverse rotation of the motor can form two gears of the electric drive assembly, and the motor can provide greater torque when reversing, so that the bicycle can ride on a steeper slope.

[0023] In summary, in this embodiment, when the E-bike bicycle is on a steep slope, the motor can provide greater torque to assist by starting forward rotation, and when the E-bike bicycle is on a very steep slope, the motor can provide greater torque to assist by starting reverse rotation, thereby improving the comfort of riding.

[0024] Obviously, without departing from the principles of the present application, some improvements or modifications can be made, which should be considered as the protection scope of the present application.

Claims

1. An E-bike two-gear hub motor drive assembly, characterized in that, The application relates to a motor, a planetary gear system, a one-way bearing and a shell, the rotating shaft of the motor is connected with the planetary gear system, the one-way bearing is sleeved on the planetary gear system, the rear end of the planetary gear system is provided with a three-stage planet carrier, the shell is sleeved on the one-way bearing system; an outer shaft one is integrally formed on the end cover of the motor, an outer shaft two is integrally formed on the three-stage planet carrier, and the outer shaft one and the outer shaft two respectively pass through and extend out of the two ends of the shell.

2. The E-bike two-gear hub motor assembly according to claim 1, wherein, The planetary gear system comprises a primary sun gear, a primary planet gear and a primary toothed ring, one end of the primary sun gear is connected with the rotating shaft of the motor, the primary sun gear is connected with the primary planet gear in gear engagement, and the outer side of the primary planet gear is further connected with the primary toothed ring in gear engagement.

3. The E-bike two-gear hub motor assembly of claim 2, wherein, The planetary gear system further comprises a secondary planet gear, a primary carrier wheel shaft and a secondary toothed ring, the primary planet gear is sleeved on the front end of the primary carrier wheel shaft, the outer side of the rear end of the primary carrier wheel shaft is connected with the secondary planet gear in gear engagement, and the outer side of the secondary planet gear is further connected with the secondary toothed ring in gear engagement.

4. The E-bike two-gear hub motor assembly of claim 3, wherein, The planetary gear system further comprises a tertiary planet gear, a secondary carrier wheel shaft and a tertiary toothed ring, the secondary planet gear is sleeved on the front end of the secondary carrier wheel shaft, the outer side of the rear end of the secondary carrier wheel shaft is connected with the tertiary planet gear in gear engagement; the tertiary planet gear is sleeved on the front end of the outer shaft two, and the outer side of the tertiary planet gear is further connected with the tertiary toothed ring in gear engagement.

5. The E-bike two-gear hub motor assembly of claim 4, wherein, The one-way bearing comprises a one-way bearing one and a one-way bearing two, the one-way bearing one is sleeved on the tertiary toothed ring, and the one-way bearing two is sleeved on the secondary carrier wheel shaft.

6. The E-bike two-gear hub motor assembly of claim 5, wherein, The shell comprises a front shell and a rear shell, the front shell is sleeved on the one-way bearing two, and the rear shell is sleeved on the one-way bearing one.

7. The E-bike two-gear hub motor assembly of claim 6, wherein, The application further relates to a rack, the rack is sleeved on the outer shaft one, the motor, the primary toothed ring and the secondary toothed ring, a bearing is arranged between the front shell and the outer shaft one, a bearing is arranged between the rear shell and the outer shaft two, the front shell is sleeved on the bearing, and the bearing is sleeved on the rack.

Images