CN220435267U - Flywheel connection structure - Google Patents
Flywheel connection structure Download PDFInfo
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- CN220435267U CN220435267U CN202321868444.8U CN202321868444U CN220435267U CN 220435267 U CN220435267 U CN 220435267U CN 202321868444 U CN202321868444 U CN 202321868444U CN 220435267 U CN220435267 U CN 220435267U
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- 230000007774 longterm Effects 0.000 abstract description 3
- 238000003754 machining Methods 0.000 description 10
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- 238000005299 abrasion Methods 0.000 description 3
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Abstract
The utility model relates to a flywheel connecting structure, which comprises a flywheel and a motor side cover connecting seat, wherein a driving shaft is arranged on the motor side cover connecting seat, an external spline is arranged on the circumferential outer wall of the driving shaft, an internal spline is arranged on the circumferential inner wall of a flywheel shaft hole, spline connection is realized between the driving shaft and the internal spline through the external spline, and the spline connection structure between the driving shaft and the flywheel is not matched with each other in the middle area and is matched with each other only in the two end areas. The utility model effectively solves the problems of low matching precision, high processing precision requirement and difficult production and assembly caused by easy stress concentration in the whole spline connection in the prior art. Avoiding uneven wear caused by long-term use and improving the matching precision and the transmission efficiency.
Description
Technical Field
The utility model relates to the technical field of electric vehicle driving devices, in particular to a flywheel connecting structure.
Background
In the prior art, a driving shaft is arranged on a motor side cover connecting seat of the electric vehicle and is in transmission connection with a flywheel, the structure principle of the motor side cover connecting seat is that an overrunning clutch, namely a one-way transmission mechanism, is actually adopted, when the driving force of pedals is transmitted to the flywheel by a chain, the flywheel drives a rear wheel to rotate through the driving shaft, and when the chain does not have power transmission, the flywheel is static and the rear wheel and the flywheel do not influence each other when the rear wheel normally runs. The flywheel is connected with the driving shaft through threads, and the threaded connection structure has the problems that: on one hand, when the chain wheel is used, the chain wheel and the flywheel are not in the same straight line, so that jamming is easy to occur when the chain is driven, the flywheel threads are withdrawn, and a safety accident is caused by jamming of the driving shaft; on the other hand, the flywheel and the driving shaft have poor coaxiality, so that the tooth part swings left and right when the flywheel runs, the transmission efficiency is influenced, and the abrasion of flywheel teeth and chains is accelerated. Meanwhile, the flywheel is in threaded connection with the driving shaft and is complex to assemble, and the flywheel is difficult to repair, replace and disassemble.
In order to solve the above problems, see CN213083414U for a driving assembly of an electric bicycle and an electric bicycle, which discloses a flywheel mounting structure, wherein a threaded connection structure between a flywheel and a driving shaft is adjusted to a multi-face insertion structure, i.e. a spline fitting structure, and only circumferential positioning is performed on the flywheel through spline fitting. When the flywheel moves outwards and touches the clamp spring to limit, the clamp spring cannot be broken by force, so that the flywheel can be kept at the original set position, and the problem of falling of the flywheel is solved. But it has the problems that: the internal spline of the flywheel shaft hole and the external spline of the driving shaft are matched with each other by the whole spline, so that the matching precision of the internal spline and the external spline is required to be high, the spline processing difficulty is high, the stress concentration can be caused by the whole spline matching, and particularly, the larger stress concentration can be generated in the middle area of the matching structure, uneven abrasion can occur along with long-term use, the matching precision is affected, and the transmission efficiency is reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a flywheel connecting structure, which improves the matching precision of spline connection and prolongs the service life.
The technical scheme adopted by the utility model is as follows:
the utility model provides a flywheel connecting structure, which comprises a flywheel and a motor side cover connecting seat, wherein a driving shaft is arranged on the motor side cover connecting seat, an external spline is arranged on the circumferential outer wall of the driving shaft, an internal spline is arranged on the circumferential inner wall of a flywheel shaft hole, spline connection is realized between the driving shaft and the internal spline through the external spline, and the spline connection structure between the driving shaft and the flywheel is not matched with each other in the middle area and is matched with each other only in the two end areas.
The further technical scheme is as follows:
the middle area of the flywheel shaft hole is provided with a first groove along the circumferential direction, the first groove partitions the internal spline into two discontinuous parts, external splines on the driving shaft are continuously distributed along the direction of a generatrix, and a non-contact cavity is formed between the first groove and the external splines;
the bottom of the first groove is lower than the top of the internal spline teeth.
The bottom of the first groove is higher than, lower than or equal to the height of the tooth root of the internal spline teeth.
A second groove is formed in the middle area of the circumferential outer wall of the driving shaft along the circumferential direction, the second groove partitions the external spline into two discontinuous parts, internal splines on the flywheel shaft hole are continuously distributed along the direction of a generatrix, and a non-contact cavity is formed between the second groove and the internal splines;
the bottom of the second groove is lower than the top of the external spline teeth.
The bottom of the second groove is higher than, lower than or equal to the height of the tooth root of the external spline key tooth.
A first groove is formed in the middle area of the flywheel shaft hole along the circumferential direction, the first groove partitions the internal spline into two discontinuous parts, a second groove is formed in the middle area of the circumferential outer wall of the driving shaft along the circumferential direction, the second groove partitions the external spline into two discontinuous parts, and the second groove corresponds to the first groove in position to form a non-contact cavity;
the bottom of the first groove is lower than the height of the tooth top of the internal spline teeth, and the bottom of the second groove is lower than the height of the tooth top of the external spline teeth.
The groove bottom of the first groove is higher than, lower than or equal to the height of the tooth root of the internal spline teeth, and the groove bottom of the second groove is higher than, lower than or equal to the height of the tooth root of the external spline teeth.
And the end part of the driving shaft is provided with a mounting groove along the circumferential direction.
The spline connection structure adopts involute splines or rectangular splines.
The utility model also provides an electric bicycle, which comprises the flywheel connecting structure.
The beneficial effects of the utility model are as follows:
the utility model effectively solves the problems of low matching precision, high processing precision requirement and difficult production and assembly caused by stress concentration easily generated in the whole spline matching connection in the prior art. Avoiding uneven wear caused by long-term use and improving the matching precision and the transmission efficiency.
Compared with the existing whole matched structure, the utility model has the advantages of high matching precision, improved transmission efficiency, reduced requirements on the machining precision of the flywheel inner hole and the driving shaft, easy production, convenient machining and assembly, improved production efficiency and reduced production cost.
Additional features and advantages of the utility model will be set forth in the description which follows, or may be learned by practice of the utility model.
Drawings
Fig. 1 is an exploded view of embodiment 1 of the present utility model.
Fig. 2 is a sectional view of the assembled structure of embodiment 1 of the present utility model.
Fig. 3 is an exploded view of embodiment 2 of the present utility model.
Fig. 4 is a sectional view of the assembled structure of embodiment 2 of the present utility model.
Fig. 5 is an enlarged view of a portion a in fig. 4.
Fig. 6 is an exploded view of embodiment 3 of the present utility model.
Fig. 7 is a sectional view of the assembled structure of embodiment 3 of the present utility model.
Fig. 8 is an enlarged view of a portion B in fig. 7.
Fig. 9 is an analysis schematic diagram of the mechanism of action of the spline fitting structure of flywheel and drive shaft in example 2 and the prior art.
In the figure: 1. a motor side cover connecting seat; 2. an external spline; 3. a second groove; 4. a drive shaft; 5. a flywheel; 6. an internal spline; 7. a first groove; 8. and a mounting groove.
Detailed Description
The following describes specific embodiments of the present utility model with reference to the drawings.
Referring to fig. 1, the flywheel connecting structure comprises a flywheel 5 and a motor side cover connecting seat 1, wherein a driving shaft 4 is arranged on the motor side cover connecting seat 1, an external spline 2 is arranged on the circumferential outer wall of the driving shaft 4, an internal spline 6 is arranged on the circumferential inner wall of a flywheel 5 shaft hole, spline connection is realized between the driving shaft 4 and the flywheel 5 through the external spline 2 and the internal spline 6, the spline connection structure between the driving shaft 4 and the flywheel 5 is not matched with each other in the middle area, and only the two end areas are matched with each other.
By avoiding contact between the flywheel and the drive shaft in the intermediate region, stress concentrations in the intermediate region that are likely to occur in the spline coupling are eliminated. Meanwhile, spline matching is only carried out at two ends, and compared with a structure of matching with the whole spline, the spline matching method has the advantages of low requirement on spline machining precision, easier assembly and higher matching precision.
The flywheel connecting structure of the present application is further described in the following embodiments.
Example 1
As shown in fig. 1, the flywheel connecting structure of the embodiment comprises a flywheel 5 and a motor side cover connecting seat 1, wherein a driving shaft 4 is arranged on the motor side cover connecting seat 1, an external spline 2 is arranged on the circumferential outer wall of the driving shaft 4, a second groove 3 is arranged in the middle area of the circumferential outer wall of the driving shaft 4 along the circumferential direction, and the external spline 2 is divided into two discontinuous parts by the second groove 3; the internal splines 6 on the shaft hole of the flywheel 5 are continuously distributed along the direction of the generatrix, and a non-contact cavity is formed between the second groove 3 and the internal splines 6, as shown in fig. 2.
Specifically, the bottom of the second groove 3 is lower than the height of the key tooth top of the external spline 2.
Specifically, the groove bottom of the second groove 3 is higher than, lower than or equal to the height of the tooth root of the external spline 2.
Example 2
As shown in fig. 3 and 4, the flywheel connecting structure of the embodiment comprises a flywheel 5 and a motor side cover connecting seat 1, wherein a driving shaft 4 is arranged on the motor side cover connecting seat 1, external splines 2 are arranged on the circumferential outer wall of the driving shaft 4, and the external splines 2 are continuously distributed along the direction of a generatrix; the inner wall of the circumference of the flywheel 5 shaft hole is provided with an internal spline 6, the middle area of the flywheel 5 shaft hole is provided with a first groove 7 along the circumference, the internal spline 6 is divided into two discontinuous parts by the first groove 7, the flywheel 5 and the driving shaft 4 are in spline connection with the internal spline 6 through the external spline 2, and a non-contact cavity is formed between the first groove 7 and the external spline 2, as shown in fig. 5.
Specifically, the bottom of the first groove 7 is lower than the height of the key tooth top of the internal spline 6;
specifically, the groove bottom of the first groove 7 is higher than, lower than or equal to the height of the tooth root of the key teeth of the internal spline 6.
Example 3
As shown in fig. 6 and 7, the flywheel connecting structure of the present embodiment includes a flywheel 5 and a motor side cover connecting seat 1, and a driving shaft 4 is provided on the motor side cover connecting seat 1; the structure of the driving shaft 4 is the same as that of the embodiment 1, and the structure of the flywheel 5 is the same as that of the embodiment 2, namely: the first groove 7 divides the internal spline 6 into two discontinuous parts, the second groove 3 divides the external spline 2 into two discontinuous parts, the second groove 3 corresponds to the first groove 7 in position, and when the two grooves are matched, a non-contact cavity is formed, as shown in fig. 8.
Specifically, the bottom of the first groove 7 is lower than the height of the key tooth top of the internal spline 6, and the bottom of the second groove 3 is lower than the height of the key tooth top of the external spline 2;
specifically, the groove bottom of the first groove 7 is higher than, lower than or equal to the height of the tooth root of the key tooth of the internal spline 6, and the groove bottom of the second groove 3 is higher than, lower than or equal to the height of the tooth root of the key tooth of the external spline 2.
In the above embodiments, the formed cavity realizes the non-whole spline fit contact between the flywheel and the driving shaft, and only the two end areas are in fit contact, but the middle area is not in contact (fit), so that the stress concentration in the middle area can be effectively avoided, and the problem that the transmission efficiency is affected due to the reduction of the fit precision caused by uneven wear is avoided.
As a conventional technical means, the end of the driving shaft 4 is provided with a mounting groove 8 along the circumferential direction, which can be used for mounting an elastic retainer ring (limit snap spring) for the shaft and for axially limiting the flywheel. It will be appreciated that the first and second slots in this application are quite different in structure and function from the mounting slots 8.
It will be appreciated by those skilled in the art that the dash-dot lines in the cross-sectional views of fig. 1-8 represent "centerlines" or "reference circles" and do not represent solid structures.
All three embodiments can realize that the spline connection structure between the driving shaft 4 and the flywheel 5 is not matched with each other in the middle area and is matched with each other only in the two end areas. Taking example 2 as an example, compared with the existing whole spline fit structure, the action mechanism analysis is as follows:
as shown in fig. 9 (a), in the prior art, in the machining process of the whole long inner and outer splines, the middle parts of the matched tooth surfaces of the inner and outer splines are convex due to the cutter relieving phenomenon, so that finish machining or even high finish machining is required for reducing the convex, thus the machining process is increased, the machining cost is increased, and the production efficiency is reduced. Meanwhile, the whole spline is matched with the whole tooth surface, so that the assembling difficulty is high, the matched tooth surface is convex, the middle part is matched after assembling, the stress at the middle part is concentrated, the abrasion is aggravated, the integral matching precision of the internal spline and the external spline is affected, and the power loss is increased.
As shown in (b) of fig. 9, the present application processes a groove in the middle of the internal spline, and divides the internal spline into left and right parts, so that the cutter relieving phenomenon in the spline tooth processing process is well overcome, even if the middle part of the two parts of independent spline mating tooth surfaces still has convex, the two parts of independent spline mating tooth surfaces are very small and acceptable, thus the finish machining and even high finish machining for reducing the convex of the whole spline are not needed, thereby reducing the processing procedure, saving the processing cost and greatly improving the production efficiency. The two-end spline is adopted for matching, so that the assembly is easy, and because the tooth surfaces with two independent ends are matched after the assembly, the middle is a vacancy, the defects of stress concentration and uneven wear of the middle part of the whole spline are avoided, the integral matching precision of the internal spline and the external spline is ensured, and the power loss is reduced.
The embodiment of the application also provides an electric bicycle, which comprises the flywheel connecting structure of any one of the embodiments 1 to 3.
Those of ordinary skill in the art will appreciate that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (9)
1. The utility model provides a flywheel connection structure, includes flywheel (5) and motor limit lid connecting seat (1), be equipped with drive shaft (4) on motor limit lid connecting seat (1), the circumference outer wall of drive shaft (4) is equipped with external spline (2), the circumference inner wall in flywheel (5) shaft hole is equipped with internal spline (6), and both realize spline coupling through external spline (2) and internal spline (6), its characterized in that, spline coupling structure between drive shaft (4) and flywheel (5) does not have each other in middle region, only cooperates each other in both ends region.
2. The flywheel connecting structure according to claim 1, characterized in that a first groove (7) is arranged in the middle area of the flywheel (5) shaft hole along the circumferential direction, the first groove (7) cuts off the internal spline (6) into two discontinuous parts, the external spline (2) on the driving shaft (4) is continuously distributed along the direction of a bus, and a non-contact cavity is formed between the first groove (7) and the external spline (2);
the groove bottom of the first groove (7) is lower than the height of the key tooth top of the internal spline (6).
3. Flywheel connection according to claim 2, characterized in that the groove bottom of the first groove (7) is higher, lower or equal to the height of the tooth root of the internal spline (6).
4. The flywheel connecting structure according to claim 1, characterized in that a second groove (3) is arranged in the middle area of the circumferential outer wall of the driving shaft (4) along the circumferential direction, the second groove (3) partitions the external spline (2) into two discontinuous parts, the internal splines (6) on the shaft hole of the flywheel (5) are continuously distributed along the direction of a generatrix, and a non-contact cavity is formed between the second groove (3) and the internal splines (6);
the bottom of the second groove (3) is lower than the height of the key tooth top of the external spline (2).
5. The flywheel connection according to claim 4, characterized in that the groove bottom of the second groove (3) is higher, lower or equal to the height of the tooth root of the external spline (2).
6. The flywheel connecting structure according to claim 1, characterized in that a first groove (7) is circumferentially arranged in the middle area of the flywheel (5) shaft hole, the first groove (7) partitions the internal spline (6) into two discontinuous parts, a second groove (3) is circumferentially arranged in the middle area of the circumferential outer wall of the driving shaft (4), the second groove (3) partitions the external spline (2) into two discontinuous parts, and the second groove (3) corresponds to the first groove (7) in position to form a non-contact cavity;
the groove bottom of the first groove (7) is lower than the height of the key tooth top of the internal spline (6), and the groove bottom of the second groove (3) is lower than the height of the key tooth top of the external spline (2).
7. The flywheel connecting structure according to claim 6, characterized in that the groove bottom of the first groove (7) is higher, lower or equal to the height of the tooth root of the internal spline (6), and the groove bottom of the second groove (3) is higher, lower or equal to the height of the tooth root of the external spline (2).
8. Flywheel connection according to claim 1, characterized in that the end of the drive shaft (4) is provided with a mounting groove (8) in the circumferential direction.
9. The flywheel connection of claim 1, wherein the spline coupling employs involute splines or rectangular splines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321868444.8U CN220435267U (en) | 2023-07-17 | 2023-07-17 | Flywheel connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321868444.8U CN220435267U (en) | 2023-07-17 | 2023-07-17 | Flywheel connection structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220435267U true CN220435267U (en) | 2024-02-02 |
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ID=89687552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321868444.8U Active CN220435267U (en) | 2023-07-17 | 2023-07-17 | Flywheel connection structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220435267U (en) |
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2023
- 2023-07-17 CN CN202321868444.8U patent/CN220435267U/en active Active
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