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CN-115313757-B - Light efficient through shaft type hub motor

CN115313757BCN 115313757 BCN115313757 BCN 115313757BCN-115313757-B

Abstract

The invention discloses a light and efficient through shaft type hub motor, which comprises a through shaft, a hub shell arranged on the through shaft, a movement, a planetary reduction mechanism and a clutch, wherein the movement, the planetary reduction mechanism and the clutch are arranged in the through shaft and are assembled in sequence along the through shaft, the clutch comprises an outer ring and an inner ring, the inner ring is fixed on the through shaft, the planetary reduction mechanism comprises a sun gear and a plurality of planetary gears which are arranged on the output end of the movement, the planetary gears are arranged on the planetary shaft, the planetary shaft is fixed on the outer ring of the clutch, the sun gear is in transmission connection with a gear ring fixed on the inner side of the hub shell through the planetary gears, and the light and efficient through shaft type hub motor is characterized in that the planetary gears are duplex gears and comprise large gears and small gears which are coaxially and separately arranged, the large gears are plastic gears and meshed with the sun gears, the small gears are metal gears meshed with the gear rings, and an extension shaft sleeve is integrally arranged in the center of the small gears so as to fix the large gears. The through shaft type hub motor can ensure higher output power and better internal structural strength on the premise of reducing weight, and the volume is further reduced.

Inventors

  • WEN QUNFENG

Assignees

  • 苏州盛亿电机有限公司

Dates

Publication Date
20260508
Application Date
20220823

Claims (8)

  1. 1. A lightweight and efficient through-shaft type hub motor comprises a through-shaft (1), a hub shell (3) with two ends mounted on the through-shaft (1) through shell bearings (2), and a movement (A), a planetary reduction mechanism and a clutch (4) which are arranged in the hub shell (3) and are sequentially assembled along the through-shaft (1), wherein the clutch (4) comprises an outer ring (401) and an inner ring (402), the inner ring (402) is fixed on the through-shaft (1), the planetary reduction mechanism comprises a sun gear (5) and a plurality of planetary gears (6) which are arranged on the output end of the movement (A), the planetary gears (6) are arranged on the planetary shafts (7), the planetary shafts (7) are fixed on the outer ring (401) of the clutch (4), and the sun gear (5) is in transmission connection with a gear ring (8) which is fixed on the inner side of the hub shell (3) through the planetary gears (6), and the planetary reduction mechanism comprises a coaxial but split large gear (601) and a small gear (602), wherein the large gear (601) is a plastic gear, the sun gear (5) is meshed with the small gear (602) and the large gear (602) is meshed with the large gear (602) in an integral manner; A yielding cavity (401 a) for embedding a pinion (602) is formed in the end face of an outer ring (401) of the clutch (4) corresponding to each planetary gear (6), and an opening (401 b) is formed in the periphery of the outer ring (401) corresponding to each yielding cavity (401 a) so that the peripheral tooth part of the pinion (602) protrudes to be meshed with the gear ring (8); The gear ring (8) is a plastic gear ring.
  2. 2. The lightweight and efficient through-shaft type hub motor as claimed in claim 1, wherein the large gear (601) is injection-molded and fixed on the periphery of the extension shaft sleeve (602 a) of the pinion (602), or the large gear (601) is embedded on the periphery of the extension shaft sleeve (602 a) of the pinion (602) through a key slot structure in a matching manner.
  3. 3. The lightweight and efficient through-shaft type hub motor according to claim 1, wherein a core end shaft hole (9) and a clutch end shaft hole (10) which are respectively used for enabling two ends of a through-shaft (1) to extend are formed in the hub shell (3), a clamping base mechanism (11) is arranged on a section of the through-shaft (1) which extends out of the hub shell (3) through the clutch end shaft hole (10), a shaft shoulder (101) is formed on the through-shaft (1) and used for assembling and supporting a shell bearing (2) positioned in the core end shaft hole (9), and a plurality of lead-out wire holes (101 a) are formed in the shaft shoulder (101) and used for leading out lead-out wires (12) of a core (A) to the outside of the hub shell (3).
  4. 4. The lightweight and efficient through-shaft type hub motor according to claim 1, wherein the movement (a) is of an inner stator (13) structure of an outer rotor (14), and the sun gear (5) is sleeved on the through-shaft (1) and fixed with the rotor (14).
  5. 5. The lightweight and efficient through-shaft type hub motor as set forth in claim 4, wherein the rotor (14) comprises a rotor flywheel cover (14 a) arranged on the periphery of the stator (13) and magnetic steel (14 b) fixed on the inner wall of the rotor flywheel cover (14 a) opposite to the inner stator (13), the rotor flywheel cover (14 a) is assembled on the through-shaft (1) through a rotor bearing (15), and the sun gear (5) is fixed with the outer end of the rotor flywheel cover (14 a).
  6. 6. A lightweight and efficient through-shaft hub motor as claimed in claim 1, characterized in that the extension sleeve (602 a) of the pinion (602) is assembled on the planet shaft (7) by means of a plurality of planet bearings (16), the planet bearings (16) being plain bearings.
  7. 7. The lightweight and efficient through shaft type hub motor as claimed in claim 1, wherein the through shaft (1) is a hollow cylindrical shaft for penetrating a quick release shaft (17).
  8. 8. The lightweight and efficient through-shaft type hub motor as claimed in claim 1, wherein the planetary gears (6) are distributed in central symmetry with respect to the sun gear (5) and have a number of 3 or more.

Description

Light efficient through shaft type hub motor Technical Field The invention relates to a lightweight and efficient through shaft type hub motor. Background In the prior art, a type of hub motor is manufactured and applied to an electric power assisted bicycle on a highway, and the industry has higher production requirements on the overall weight, volume, structural strength and output power of the hub motor. As is well known, compared with the hub motor of the segmented shaft architecture, the hub motor of the through shaft type has higher structural strength when supporting the movement part, can not limit the output torque, does not need to correct the concentricity between the two sections of shafts, has fewer parts and less structure, is relatively simple, and is easier to manufacture and assemble. Therefore, the through shaft type hub motor is more adopted in the industry at present. The through shaft type hub motor is structurally characterized in that a main shaft adopts a through shaft, and a machine core (comprising a stator and a rotor), a planetary reduction mechanism and a clutch are assembled in sequence along the through shaft. In the conventional structural design at present, in order to make the structure compact, each planetary gear in the planetary reduction mechanism is often designed to be integrated with a clutch, namely, the clutch is fixed on a through shaft to serve as a planetary carrier, and a planetary shaft in the center of the planetary gear is directly fixed on an outer ring of the clutch. The sun gear is fixed on the output end of the movement and sleeved on the through shaft, and the sun gear is in transmission connection with the gear ring fixed on the inner side of the hub shell through a plurality of planetary gears in the planetary reduction mechanism. The planet gears are typically formed as integrally formed twin gears with the large gear meshed with the sun gear and the small gear meshed with the ring gear. However, at present, the through shaft type hub motor still has the following problems in actual use: 1) In order to further reduce the mass, the planetary gears of the known art are conventionally manufactured integrally from a single plastic, such as POM (polyoxymethylene) plastic, PEEK (polyetheretherketone) plastic, and nylon plastics such as PA66 and PA46, but inevitably suffer from reduced structural strength. In order to make up for the defect, the current practice usually makes the plastic duplex gear thick to strengthen the structural strength, however, when the diameter of the large gear in the duplex gear is increased, the rotation speed ratio of the large gear and the sun gear at the output end of the rotor is reduced, and finally the integral output power of the motor is reduced. 2) The same problem is that after the outer diameter of the large gear in the planetary gear is increased, the outer diameter of the whole hub shell is increased, and finally the whole volume of the hub motor is increased, the material consumption is increased, the weight is increased, and the cost is increased. 3) The axial dimension of the whole motor is not reduced after the planetary gear and the clutch are integrated, the internal structure is still not compact and optimized, and the requirement of the hub motor used as the road electric booster bicycle is met by a larger improvement space. Disclosure of Invention The invention aims to provide a light and efficient through shaft type hub motor which can still ensure higher output power and better internal structural strength under the premise of lighter weight, has smaller volume and more compact internal structure, and is more suitable for electric power-assisted bicycles on roads. The technical scheme is that the light and efficient through-shaft type hub motor comprises a through shaft, a hub shell, a movement, a planetary reduction mechanism and a clutch, wherein both ends of the hub shell are arranged on the through shaft through shell bearings, the movement, the planetary reduction mechanism and the clutch are arranged in the hub shell and are assembled in sequence along the through shaft, the clutch comprises an outer ring and an inner ring, the inner ring is fixed on the through shaft, the planetary reduction mechanism comprises a sun gear and a plurality of planetary gears which are arranged on the output end of the movement, the planetary gears are arranged on the planetary shaft, the planetary shafts are fixed on the outer ring of the clutch, the sun gear is in transmission connection with a gear ring fixed on the inner side of the hub shell through the planetary gears, and the through-shaft type hub motor is characterized in that the planetary gears are duplex gears and comprise a large gear and a small gear which are coaxially and separately arranged, the large gear is a plastic gear and meshed with the sun gear, the small gear is a metal gear and meshed with the gear ring, and an extension shaft sleeve is inte