CN214674655U - Electric bicycle hub end cover connecting structure - Google Patents
Electric bicycle hub end cover connecting structure Download PDFInfo
- Publication number
- CN214674655U CN214674655U CN202120321178.1U CN202120321178U CN214674655U CN 214674655 U CN214674655 U CN 214674655U CN 202120321178 U CN202120321178 U CN 202120321178U CN 214674655 U CN214674655 U CN 214674655U
- Authority
- CN
- China
- Prior art keywords
- end cover
- hub
- electric bicycle
- left end
- connection structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000009434 installation Methods 0.000 claims abstract description 5
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims 1
- 239000000565 sealant Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- VYQRBKCKQCRYEE-UHFFFAOYSA-N ctk1a7239 Chemical compound C12=CC=CC=C2N2CC=CC3=NC=CC1=C32 VYQRBKCKQCRYEE-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Landscapes
- Motor Or Generator Frames (AREA)
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
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=Po/pi
eta is motor efficiency, PoIs input power, piTo input power
Po=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 (6)
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.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202120321178.1U CN214674655U (en) | 2021-02-04 | 2021-02-04 | Electric bicycle hub end cover connecting structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202120321178.1U CN214674655U (en) | 2021-02-04 | 2021-02-04 | Electric bicycle hub end cover connecting structure |
Publications (1)
Publication Number | Publication Date |
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CN214674655U true CN214674655U (en) | 2021-11-09 |
Family
ID=78446217
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202120321178.1U Expired - Fee Related CN214674655U (en) | 2021-02-04 | 2021-02-04 | Electric bicycle hub end cover connecting structure |
Country Status (1)
Country | Link |
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CN (1) | CN214674655U (en) |
-
2021
- 2021-02-04 CN CN202120321178.1U patent/CN214674655U/en not_active Expired - Fee Related
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
GR01 | Patent grant | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211109 |
|
CF01 | Termination of patent right due to non-payment of annual fee |