Hub of electric bicycle

A technology for electric bicycles and hubs, which is applied to vehicle parts, vehicle gearboxes, and rider drives, etc. It can solve the problems of increasing the reduction ratio between the sun gear and the inner ring gear of the hub, reducing the strength of the main shaft, and large torque, etc., to achieve improved The effect of the output torque of the hub, the reduction of the volume of the hub, and the increase of the reduction ratio

Active Publication Date: 2012-09-05
BAFANG ELECTRIC (SUZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the specific improvement process, the applicant encountered the following problems: In order to obtain a larger output torque, the motor speed must be increased, and the reduction ratio between the sun gear and the inner ring gear of the hub must be increased, but the outer diameter of the hub must be as large as possible. In this case, the number of teeth of the sun gear can only be reduced by reducing the shaft diameter of the main shaft, so as to achieve the purpose of increasing the reduction ratio between the sun gear and the inner ring gear of the hub; but if the main shaft is made thinner, the main shaft will be reduced Strength of
And there is a patent to fix the inner ring of the clutch directly on the main shaft, and the torque generated by the clutch will directly act on the main shaft, so that the main shaft bears a relatively large torque and requires relatively high strength for the main shaft. Once the main shaft is made thinner , it will greatly reduce the overall working reliability and safety of the hub

Method used

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  • Hub of electric bicycle
  • Hub of electric bicycle
  • Hub of electric bicycle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: as figure 1 As shown, the electric bicycle hub provided by this embodiment includes a main shaft 1 fixed on the vehicle frame 2, and a hub housing 4 is installed on the main shaft 1 through a hub housing bearing 3, and the inside of the hub housing 4 is sequentially arranged from right to left Motor, planetary gear reduction mechanism and clutch 5 are installed. The motor adopts an inner stator and an outer rotor structure, wherein the stator 14 is fixed on the main shaft 1 through a keyway, and the rotor 6 is installed on the main shaft 1 through a two-stage rotor bearing 15, and the rotor 6 is in a pot-shaped structure, and the opening of the pot-shaped structure faces outwards . The rotor 6 is fixed with a sun gear 7 sleeved on the main shaft 1, and the sun gear 7 is meshed with three planetary gears 8 (only one planetary gear is marked in the figure), and the three planetary gears 8 are fixed on the hub shell 4. The hub ring gear 9 meshes, and each p...

Embodiment 2

[0026] Embodiment 2: as figure 2 As shown, the structure of this embodiment is basically the same as that of the embodiment, the only difference is that in this embodiment, a positioning key 17 is provided on the fixed ring 5a, and the positioning key 17 is matched with the positioning groove provided on the main shaft 1, When the positioning key 17 is matched with the positioning groove, the hook 12a on the anti-rotation ring 12 can just catch the bottom of the first connecting frame 2a to complete the assembly and positioning, and at the same time, the protruding piece 16a on the anti-rotation piece 16 is also just in place. It can cooperate with the corresponding slot on the second connecting frame 2b to complete the assembly and positioning, which is convenient for the overall assembly of the present invention and can speed up the assembly speed. Of course, it should be pointed out that the cooperation of the positioning key 17 on the fixed ring 5 a with the positioning g...

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Abstract

The invention discloses a hub of an electric bicycle, comprising a main shaft fixed on a frame. The main shaft is provided with a hub shell by a hub shell bearing; a motor, a planet wheel reducing mechanism and a clutch are arranged in the hub shell; the motor adopts a structure with an inner stator and an outer rotor; a sun gear sleeved on the main shaft is fixed on the rotor; the sun gear is meshed with a planet gear; the planet gear is meshed with a hub inner gear ring fixed on the hub shell; the planet gear is arranged on a planet shaft by a planet bearing; the planet shaft is fixed on the clutch; and the clutch and the frame are fixed with each other. Compared with the prior art, the torsion of the clutch in work is borne by using the frame, the torque force borne by the main shaft is greatly reduced, and thereby, the main shaft is made thin to reduce the tooth number of the sun gear under the premise of ensuring the strength of the main shaft to achieve the goals of increasing the reduction ratio of the sun gear to the hub inner gear ring, further increasing the output torque of the main shaft and reducing the volume of the hub.

Description

technical field [0001] The invention relates to an electric bicycle hub. Background technique [0002] In recent years, electric bicycles have gradually been accepted by consumers as an environmentally friendly and energy-saving means of transportation. Whether at home or abroad, the sales of electric bicycles in the world are also increasing year by year, and the trend of electric bicycles replacing bicycles is gradually expanding. , and the electric bicycle hub is the core component of the electric bicycle, and its quality often determines the overall quality of the electric bicycle. [0003] The Chinese patent No. ZL 200320123400.9 discloses a wheel hub for electric bicycles. The structure of this wheel hub includes a main shaft, and a hub shell is installed on the main shaft through bearings. A motor, a planetary gear reduction mechanism and a clutch are installed in the hub shell. The motor adopts the structure of inner stator and outer rotor. The rotor is fixed with a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B62M6/60B62M23/00
Inventor 王清华贺先兵丁俊
Owner BAFANG ELECTRIC (SUZHOU) CO LTD
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