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CN-121984274-A - Centrally-mounted motor with improved harmonic reducer

CN121984274ACN 121984274 ACN121984274 ACN 121984274ACN-121984274-A

Abstract

The invention discloses a centrally-mounted motor with an improved harmonic reducer, belongs to the technical field of motors, and mainly solves the problem that the existing centrally-mounted motor has a fixed reduction ratio and cannot adapt to multiple working conditions. The motor comprises an end cover, a motor stator assembly, a motor rotor, a wave generator, a flexible gear, a rigid gear, an adjusting motor, a controller and the like, wherein the core improvement is that the rigid gear structure is that 60 teeth are arranged in an inner ring of a rigid rim, the number of fixed teeth is equal to 30 respectively, the fixed teeth and the number of telescopic teeth are distributed alternately, the telescopic teeth are in transmission connection with a gear set through a toothed bar, and the gear set is linked with the adjusting motor through a gear ring, a worm. When the adjusting motor is started, the telescopic teeth are driven to stretch in the tooth grooves through the transmission link, the meshing tooth number of the rigid gear and the flexible gear is changed, and therefore the reduction ratio of the harmonic reducer is flexibly adjusted. The invention can make the motor output large torque when climbing heavy load, and improve efficiency when running at high speed, and is suitable for various electric vehicles such as electric bicycles, etc., and has stable structure and strong adaptability.

Inventors

  • HUANG FUMING
  • HUANG JUNNING

Assignees

  • 苏州万佳电器有限公司

Dates

Publication Date
20260505
Application Date
20251225

Claims (9)

  1. 1. The middle motor with the improved harmonic reducer is characterized by comprising an end cover (1), a motor stator assembly (2), a motor rotor (3), a wave generator (4), a motor shell I (5), a waterproof pad I (6), a flexible gear (7), a waterproof pad II (8), a controller shell (9), a controller (10), an output flange plate (11), a crossed roller bearing (12), a rigid gear (13), an adjusting motor (14), a motor shell II (15), a torque sensor (16), a main shaft (18), telescopic teeth (20) and a worm (19); the wave generator (4) is arranged in the flexible gear (7), the flexible gear (7) is partially meshed with the rigid gear (13), the flexible gear (7) is in transmission connection with the output flange plate (11), and the flexible gear (7) is arranged in the motor shell II (15) through a crossed roller bearing (12); The motor rotor (3) is arranged in the motor shell II (15) through a bearing, the output flange plate (11) is in transmission connection with the main shaft (18) through a needle bearing, the telescopic teeth (20) are arranged on the inner side of the motor shell II (15), and the worm (19) is arranged on the output shaft of the adjusting motor (14); The rigid wheel (13) comprises a rigid wheel rim (21), telescopic teeth (20) and fixed teeth (22) are alternately arranged on the inner ring of the rigid wheel rim (21), tooth grooves (27) are formed in the inner ring of the rigid wheel rim (21), the telescopic teeth (20) are slidably matched in the tooth grooves (27), a toothed bar (23) is fixedly connected with the telescopic teeth (20), and the toothed bar (23) is slidably matched with the rigid wheel rim (21).
  2. 2. The centrally-mounted motor according to claim 1, wherein a plurality of fixing rods (25) are fixedly arranged on the outer ring of the rigid rim (21), and a first gear (24) and a second gear (28) are rotatably arranged on two sides of each fixing rod (25), and the first gear (24) is meshed with the toothed rod (23).
  3. 3. A mid-motor according to claim 2, characterized in that the outer ring of the rigid rim (21) is also rotatably connected with a gear ring (26), said gear ring (26) having a toothing and a worm wheel, said toothing meshing with the second gear (28).
  4. 4. A central motor according to claim 3, characterized in that the regulating motor (14) is arranged in the second motor housing (15), the output shaft of which is in driving connection with the worm (19), the worm (19) being in engagement with the worm wheel part of the gear ring (26).
  5. 5. The centrally-mounted motor according to claim 1, wherein the end covers (1) are arranged on the outer sides of the first motor housing (5) and the second motor housing (15), and two ends of the main shaft (18) are respectively connected with the two end covers (1) in a rotating mode.
  6. 6. The centrally-mounted motor according to claim 1, wherein the waterproof pad I (6) is arranged between the motor housing I (5) and the motor housing II (15), and the motor housing I (5) and the motor housing II (15) are fixedly connected through bolts.
  7. 7. The centrally-mounted motor according to claim 1, wherein the controller housing (9) is arranged at the top of the first motor housing (5) and the second motor housing (15), the controller (10) is arranged in the controller housing (9), and the waterproof pad (8) is arranged on the connecting surface between the controller housing (9) and the first motor housing (5) and the second motor housing (15).
  8. 8. The centrally-mounted motor according to claim 1, characterized in that the detection end of the torque sensor (16) is in driving connection with the main shaft (18).
  9. 9. The centrally-mounted motor according to claim 1, wherein the motor rotor (3) is arranged in the motor stator assembly (2), the motor stator assembly (2) is fixedly connected with the motor housing one (5), the motor rotor (3) is rotationally connected with the main shaft (18) through a bearing, and an output shaft of the motor rotor (3) is in transmission connection with the wave generator (4).

Description

Centrally-mounted motor with improved harmonic reducer Technical Field The invention relates to the technical field of booster bicycles, in particular to a centrally-mounted motor with an improved harmonic reducer. Background The centrally-mounted motor has the advantages of high transmission efficiency, stable power output and the like, and is widely applied to electric vehicles such as electric bicycles, electric motorcycles and the like. The harmonic reducer is used as a core speed reducing component of the middle motor, and the speed reducing ratio characteristic of the harmonic reducer directly determines the power output performance of the motor. The traditional harmonic reducer comprises a rigid gear, a flexible gear and a wave generator, wherein the number of the internal teeth of the rigid gear is fixed, and the number of the teeth meshed with the flexible gear is kept constant, so that the reduction ratio of the harmonic reducer cannot be adjusted once the design and the formation are carried out. In practical applications, electric vehicles often need to adapt to different working conditions, such as a large reduction ratio for obtaining a larger output torque in a climbing or heavy-duty scene, and a small reduction ratio for improving the running speed in a flat road running at a high speed. The fixed reduction ratio centrally-mounted motor is difficult to simultaneously meet the optimal power demands of the multiple working conditions, so that the motor operation efficiency is reduced, the energy consumption is increased, and the user experience is affected. Therefore, developing a middle motor capable of realizing flexible adjustment of reduction ratio becomes a technical problem to be solved in the field. Therefore, how to provide a centrally-mounted motor with an improved harmonic reducer so as to solve the problems existing in the prior art has great significance for application. Disclosure of Invention In view of the above, the present application is directed to a center motor with an improved harmonic reducer to solve the problems. In order to achieve the above purpose, the present invention provides the following technical solutions: the middle motor comprises an end cover, a motor stator assembly, a motor rotor, a wave generator, a motor shell I, a waterproof pad I, a flexible gear, a waterproof pad II, a controller shell, a controller, an output flange plate, a crossed roller bearing, a rigid gear, an adjusting motor, a motor shell II, a torque sensor, a main shaft, telescopic teeth and a worm, wherein all the components are cooperatively matched, so that the basic power output function of the motor is ensured, and the reduction ratio is adjustable through the structural improvement of the rigid gear and the adjusting mechanism. The harmonic reducer core cooperation relation is that the wave generator is arranged in the flexible gear, the flexible gear is elastically deformed through rotation of the wave generator, the flexible gear is meshed with the rigid gear, speed reduction transmission is realized by means of tooth number difference of the flexible gear and the rigid gear, the flexible gear is in transmission connection with the output flange plate, and power after speed reduction is transmitted to the output end. The motor rotor is arranged in the motor stator assembly to form a motor power core, the motor stator assembly is fixedly connected with the motor shell I, the motor rotor is rotationally connected with the main shaft through a bearing, an output shaft of the motor rotor is in transmission connection with the wave generator to provide power input for the wave generator, the motor rotor is arranged in the motor shell II through a bearing to ensure rotation stability, the output flange plate is in transmission connection with the main shaft through a needle bearing, the telescopic teeth are arranged on the inner side of the motor shell II, and the worm is arranged on the output shaft of the adjusting motor to form a power input link with adjustable reduction ratio. The rigid wheel structure innovation (core improvement point) is that the rigid wheel comprises a rigid wheel rim, the inner ring of the rigid wheel rim is provided with a plurality of teeth, the number of the fixed teeth is equal to that of the telescopic teeth, thirty telescopic teeth which can retract are respectively arranged, the other thirty telescopic teeth are fixed teeth, and the telescopic teeth and the fixed teeth are alternately arranged. The inner ring of the rigid rim is provided with a tooth slot matched with the telescopic teeth, the telescopic teeth are slidably matched in the tooth slot to realize the extending and retracting actions of the telescopic teeth, the telescopic teeth are fixedly connected with a toothed bar, and the toothed bar is slidably matched with the rigid rim to provide guiding and power transmission for sliding of the telescopic teeth. The speed reduction ratio adjusting tr