CN214674655U

CN214674655U - Electric bicycle hub end cover connecting structure

Info

Publication number: CN214674655U
Application number: CN202120321178.1U
Authority: CN
Inventors: 项兆先
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-02-04
Filing date: 2021-02-04
Publication date: 2021-11-09
Anticipated expiration: 2031-02-04

Abstract

The invention relates to a hub end cover connecting structure of an electric bicycle, which comprises a hub, a left end cover and a right end cover, wherein the left end cover is made of an iron material and integrally formed by stamping and stretching; the left end cover is turned left by the right side and passes through the wheel hub hole, the side installation department interference of left end cover is impressed the wheel hub hole and is target in place and welded fastening. The invention increases the space for installing the motor in the hub, can install a motor with higher power and strengthens the sealing structure.

Description

Electric bicycle hub end cover connecting structure

Technical Field

The invention relates to the field of electric bicycle hubs, in particular to a connecting structure of an end cover of an electric bicycle hub.

Background

With the continuous development of electric bicycles, electric bicycles are increasingly popularized as green vehicles, and are gradually popularized from flat road conditions such as original cities to areas with complex road conditions such as rural areas, mountainous areas and the like, and are particularly applied to agricultural cargo carrying traffic in rural areas.

The hub structure of the existing electric bicycle is shown in fig. 1 to 4 and comprises a hub a, a hub iron ring b and a left end cover and a right end cover c, wherein threaded holes are formed in the left end face and the right end face of the hub iron ring b, the left end cover and the right end cover c are connected to the hub iron ring b through bolts or screws and are connected through screws after being coated with sealant, and therefore the fact that water cannot enter a motor inside the two end covers when the electric bicycle is immersed in water in the driving process is guaranteed. However, the sealing structure needs to be improved, and the sealant needs to be applied again in the later repair of the end cover, which is time-consuming and labor-consuming. In addition, due to the fact that the threaded holes are needed to be formed in the hub iron ring, the thickness of the hub iron ring generally needs 8mm, the inner diameter of the hub is of a specific specification, the inner space of the hub iron ring is equal to the diameter of the hub iron ring, the inner space is directly reduced by 16mm, and space waste is serious.

Disclosure of Invention

In view of the above problems, the present invention is directed to a hub and end cover connection structure of an electric bicycle, which changes the existing hub and end cover connection structure, so that the space for installing motors inside hubs of the same type is larger, and a motor with larger power can be installed.

The invention relates to a hub end cover connecting structure of an electric bicycle, which comprises a hub, a left end cover and a right end cover, wherein the left end cover is made of an iron material and integrally formed by stamping and stretching; the left end cover is turned left by the right side and passes through the wheel hub hole, the side installation department interference of left end cover is impressed the wheel hub hole and is target in place and welded fastening.

Preferably, the surface of the threaded connection part contacting the right end cover is provided with an O-shaped ring mounting groove, the O-shaped ring mounting groove is positioned on the inner side or the outer side of the threaded hole and concentric with the central axis, and an O-shaped sealing ring is arranged in the O-shaped ring mounting groove.

Preferably, the thickness at the side mounting part is 1.5 mm-2.5 mm.

Preferably, the length of the outward extension of the threaded connection part is 10 mm-20 mm.

Preferably, the side mounting part of the left end cover is pressed into the inner hole of the hub in place and then connected in a spot welding mode.

Preferably, the sealing element is an O-ring seal or a sealant.

The invention innovates the connection structure of the hub and the end cover of the electric bicycle in the industry, and obtains a plurality of advantages: 1. the whole weight of the motor is reduced; 2. the assembly efficiency is improved; 3. the number of parts is reduced, and the material cost is reduced; 4. the shell is thinned, the stator mounting space is enlarged, and the volume of the rotor is maximized under the condition of the same hub size; 5. the sealing effect is improved; 6. improve the concentricity of the axes.

Drawings

FIG. 1 is a schematic view of a conventional connection structure between a hub and an end cap of an electric bicycle;

FIG. 2 is a schematic cross-sectional view of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is an exploded view of FIG. 1;

FIG. 5 is a schematic structural view of the present invention;

FIG. 6 is a schematic cross-sectional view of the present invention;

FIG. 7 is an enlarged view of a portion of FIG. 6 at B;

FIG. 8 is an exploded view of the present invention;

FIG. 9 is a schematic view of the structure of FIG. 8 from another perspective;

wherein: 1-a hub; 2-left end cap; 3-right end cover; 4-end face support part; 5-motor shaft mounting hole; 6-side mounting part; 7-a threaded connection; 8-a threaded hole; 9-a sealing member; 10-O type circle mounting groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 5 to 9, the invention provides a hub end cover connecting structure of an electric bicycle, which comprises a hub 1, a left end cover 2 and a right end cover 3, wherein the left end cover 2 is made of ferrous material and integrally formed by stamping and stretching, the left end cover 2 comprises an end surface supporting part 4, a motor shaft mounting hole 5 is axially arranged in the center of the end surface supporting part 4, a side surface mounting part 6 axially extends backwards from the outer side of the end surface supporting part 4, a threaded connecting part 7 extends outwards from the rear end of the side surface mounting part 6, a threaded hole 8 is arranged in the circumferential direction of the threaded connecting part 7, the right end cover 3 is connected to the threaded connecting part 7 through a screw or a bolt, a sealing element 9 is arranged between the threaded connecting part 7 and the threaded connecting part, and the motor shaft mounting hole 5 is arranged in the center of the end surface of the right end cover 3; the left end cover 2 passes through the inner hole of the hub 1 from right to left, and the side surface mounting part 6 of the left end cover 2 is pressed into the inner hole of the hub 1 in an interference manner to be in place and is welded and fixed.

Preferably, the surface of the threaded connection part 7 contacting the right end cover 3 is provided with an O-ring mounting groove 10, the O-ring mounting groove 10 is located on the inner side or the outer side of the threaded hole 8 and concentric with the central axis, and an O-ring is arranged in the O-ring mounting groove 10.

Preferably, the thickness of the side mounting part 6 is 1.5 mm-2.5 mm.

Preferably, the threaded connection portion 7 extends outward by a length of 10mm to 20 mm.

Preferably, the side mounting part 6 of the left end cover 2 is pressed into the inner hole of the hub 1 and then connected in a spot welding mode, and the electric welding speed is high, the efficiency is high, and the strength is enough.

Preferably, the sealing element 9 is an O-ring or a sealant.

The invention changes the connection structure of the hub and the end cover of the electric bicycle, omits a hub iron ring, adopts iron materials for the left end cover 2 and integrally adopts stamping and drawing forming to form a side mounting part 6 and a threaded connection part 7, and can thin the side mounting part 6 to 1.5 mm-2.5 mm, particularly 2 mm. This makes original wheel hub iron ring occupy 8mm thickness, that is 16mm diameter that some annular space, reduces to only occupying 2mm thickness, that is 4mm diameter that some annular space, practices thrift the space of diameter 12mm, and this partial space that increases out can install the bigger motor of power for the motor torque is bigger, and motor efficiency is higher, increases electric bicycle mileage, power saving more relatively. In addition, after the structure is improved, the sealing structure at the joint of the left end cover and the right end cover is also improved, and the O-shaped sealing ring is more convenient to disassemble and assemble, better in sealing performance and more stable in structure.

The following is illustrated by specific calculations:

increasing the torque value of the motor turning radius:

M=F*r

m is torque, F is electromagnetic tangential force, and r is radius of gyration

Increased value of motor efficiency:

η=P_o/p_i

eta is motor efficiency, P_oIs input power, p_iTo input power

P_o=M*n/9.55

M is motor torque, n is motor rotation speed

For example, the input: 60V 30A;

original motor radius of gyration: 105mm

100rpm Motor Torque 77Nm

The motor efficiency at this moment is:

the turning radius of the existing motor is increased by 6mm, namely to 111mm

The motor torque at 100rpm is then:

the motor efficiency at this moment is:

therefore, through the change of the structure of the wheel hub and the end cover, the installation space of the motor is increased, the torque of the motor can be increased by 4.4Nm compared with the original motor, the efficiency of the motor is increased by 2.6%, and the improvement is an innovative improvement for the whole industry.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change or modification made to the above embodiments according to the technical principle of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. The utility model provides an electric bicycle wheel hub end cover connection structure, includes wheel hub (1), left end lid (2) and right end lid (3), its characterized in that: the left end cover (2) is made of iron materials and integrally formed by stamping and stretching, the left end cover (2) comprises an end face supporting part (4), a motor shaft mounting hole (5) is formed in the center of the end face supporting part (4) along the axial direction, a side face mounting part (6) extends backwards from the outer side of the end face supporting part (4) along the axial direction, a threaded connecting part (7) extends outwards from the rear end of the side face mounting part (6), a threaded hole (8) is formed in the threaded connecting part (7) along the circumferential direction, the right end cover (3) is connected to the threaded connecting part (7) through a screw or a bolt, a sealing part (9) is arranged between the threaded connecting part and the threaded connecting part, and the motor shaft mounting hole (5) is formed in the center of the end face of the right end cover (3); the left end cover (2) is turned left by the right side and passes through the inner hole of the hub (1), and the side surface installation part (6) of the left end cover (2) is pressed into the inner hole of the hub (1) in an interference mode to be in place and is welded and fixed.

2. The electric bicycle hub cap connection structure according to claim 1, wherein: the surface that threaded connection portion (7) and right-hand member lid (3) contact is provided with O type circle mounting groove (10), O type circle mounting groove (10) are located screw hole (8) inboard or outside and concentric with the central axis, be provided with O type sealing washer in O type circle mounting groove (10).

3. The electric bicycle hub cap connection structure according to claim 1, wherein: the thickness of side installation department (6) department is 1.5 mm-2.5 mm.

4. The electric bicycle hub cap connection structure according to claim 1, wherein: the length of the outward extension of the threaded connecting part (7) is 10 mm-20 mm.

5. The electric bicycle hub cap connection structure according to claim 1, wherein: the side surface mounting part (6) of the left end cover (2) is pressed into the inner hole of the hub (1) and then connected in a spot welding mode.

6. The electric bicycle hub cap connection structure according to claim 1, wherein: the sealing element (9) is an O-shaped sealing ring or a sealing glue.