CN207442597U - Low speed combined bearing structure, latent oil direct driving motor and oil extraction system - Google Patents
Low speed combined bearing structure, latent oil direct driving motor and oil extraction system Download PDFInfo
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- CN207442597U CN207442597U CN201721527781.5U CN201721527781U CN207442597U CN 207442597 U CN207442597 U CN 207442597U CN 201721527781 U CN201721527781 U CN 201721527781U CN 207442597 U CN207442597 U CN 207442597U
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Abstract
The utility model discloses a kind of low speed combined bearing structure, latent oil direct driving motor and oil extraction system, wherein, the low speed combined bearing structure includes self-aligning bearing, thrust bearing and spacer, the self-aligning bearing has inner ring and the outer ring of inside and outside distribution, the outer ring is used to be socketed in electric handpiece case, the inner ring is used to be socketed in shaft lateral surface, the thrust bearing has the Shang Quan of upward and downward distribution and lower circle, the lower circle is for being socketed in electric handpiece case, the upper circle is for being socketed in shaft lateral surface, the lower circle is moved down by electric handpiece case /V, the spacer is used to be set in shaft, the spacer includes spacer ring, the spacer ring is installed between the self-aligning bearing and the thrust bearing.Instead of the thrust bearing of existing high speed submersible motor, suitable for low speed latent oil direct driving motor, solves the problems, such as the thrust bearing of former high speed submersible motor for flimsy in low speed latent oil direct driving motor.
Description
Technical field
The utility model is related to oil field equipment technical field, more particularly to a kind of low speed combined bearing structure, latent oil
Direct driving motor and oil extraction system.
Background technology
Former latent oil direct driving motor use high speed submersible motor thrust bearing, high speed thrust bearing be sliding bearing, rotating speed
For 2850 revs/min, dynamic and static piece of bearing point forms oil film between sound block when running at high speed, realizes the lubrication of bearing, still, dives
Oily 50 revs/min of direct driving motor minimum speed 300 revs/min or so during high speed, is not easy to form oil film, easily cause between sound block
Quiet piece of abrasion.
Utility model content
The main purpose of the utility model is to propose a kind of low speed combined bearing structure, latent oil direct driving motor and oil recovery system
System, it is intended to substitute the thrust bearing of high speed submersible motor, realize the normal work of slow-speed of revolution latent oil direct driving motor.
To achieve the above object, the utility model proposes low speed combined bearing structure, including：
Self-aligning bearing, has inner ring and the outer ring of inside and outside distribution, and the outer ring is described for being socketed in electric handpiece case
Inner ring is used to be fixed by socket in shaft lateral surface；
Thrust bearing, is installed on the lower section of the self-aligning bearing, the thrust bearing have upward and downward distribution upper circle and
Lower circle, and the outer diameter of the upper circle be less than the lower circle outer diameter, it is described it is lower circle for being socketed in electric handpiece case, it is described on
For being fixed by socket in shaft lateral surface, the lower circle is moved down circle by electric handpiece case /V；And
Spacer, for being set in shaft, the spacer includes spacer ring, and the spacer ring is installed on the self-aligning bearing and institute
It states between thrust bearing.
Preferably, the self-aligning bearing is double-row self-aligning roller bearing；And/or
The thrust bearing is self-aligning thrust roller bearing.
The utility model also proposed a kind of latent oil direct driving motor, and the latent oil direct driving motor includes electric handpiece case, turns
Axis and low speed combined bearing structure, wherein, the electricity handpiece case has upward and downward through the inner cavity set, and the shaft rotates
The inner cavity is installed on, the low speed combined bearing structure is installed on the upper end of the inner cavity, and positioned at the electric handpiece case
Between the shaft, the low speed combined bearing structure includes：
Self-aligning bearing, has inner ring and the outer ring of inside and outside distribution, and the outer ring is described for being socketed in electric handpiece case
Inner ring is used to be fixed by socket in shaft lateral surface；
Thrust bearing, is installed on the lower section of the self-aligning bearing, the thrust bearing have upward and downward distribution upper circle and
Lower circle, and the outer diameter of the upper circle be less than the lower circle outer diameter, it is described it is lower circle for being socketed in electric handpiece case, it is described on
For being fixed by socket in shaft lateral surface, the lower circle is moved down circle by electric handpiece case /V；And
Spacer, for being set in shaft, the spacer includes spacer ring, and the spacer ring is installed on the self-aligning bearing and institute
It states between thrust bearing.
Preferably, the internal face of the electric handpiece case is set in ladder, described to form first stop surface upward
The Xia Quan lower surfaces of thrust bearing are abutted with first stop surface.
Preferably, the spacer further includes the lower body extended downwardly from the spacer ring and is upwardly extended from the spacer ring
Upper sleeve body, the inner ring are sheathed on the upper sleeve body lateral surface, and the upper sleeve body is interference fitted with the inner ring, the upper circle
It traps described in being sheathed on outside, the lower body is interference fitted with the upper circle；
The internal face of the spacer is equipped with the first keyway, and the shaft is equipped with the second key corresponding with first keyway
Slot, the latent oil direct driving motor further include key, and the key is installed in first keyway and second keyway.
Preferably, first keyway, second keyway and the key are arranged to multigroup in one-to-one corresponding.
Preferably, first axle clamp spring is further included；
Shaft upper end lateral surface is equipped with first annular slot, and the first annular slot is located at the upper of the self-aligning bearing
Side, the first axle clamp spring is installed in the first annular slot, with upper sleeve body described in /V and the self-aligning bearing to moving up
It is dynamic.
Preferably, shaft upper end lateral surface is equipped at intervals with first annular slot and the second annular groove, and first ring
Between second annular groove and the self-aligning bearing, the latent oil direct driving motor further includes shape slot：
Clip, including two semiorbicular snap-gauges, described two snap-gauges are arranged in the first annular slot, the snap-gauge
The upper surface of lower surface and the upper sleeve body push against, moved up with upper sleeve body described in /V；
Lasso is sheathed on the lateral surface of clip, and the internal face of the lasso is set in step, to form one downward second
Stop surface, the upper surface of second stop surface and the clip push against；And
Elastic spring is installed in second annular groove, the upper table of the lateral surface of the elastic spring and the lasso
Face pushes against, and is moved up with lasso described in /V.
Preferably, the internal face of the electric handpiece case is equipped with the 3rd annular groove；
The latent oil direct driving motor further includes the first hole baffle ring, and first hole is installed on the 3rd annular with baffle ring
In slot, moved up with outer ring described in /V.
The utility model also proposed a kind of oil extraction system, and including latent oil direct driving motor, the latent oil direct driving motor includes
Electric handpiece case, shaft and low speed combined bearing structure, wherein, shaft rotational installation is in the electric handpiece case, institute
It states the low speed combined bearing structure to be installed between the electric handpiece case and the shaft, the low speed combination bearing
Structure includes：
Self-aligning bearing, has inner ring and the outer ring of inside and outside distribution, and the outer ring is described for being socketed in electric handpiece case
Inner ring is used to be fixed by socket in shaft lateral surface；
Thrust bearing, is installed on the lower section of the self-aligning bearing, the thrust bearing have upward and downward distribution upper circle and
Lower circle, and the outer diameter of the upper circle be less than the lower circle outer diameter, it is described it is lower circle for being socketed in electric handpiece case, it is described on
For being fixed by socket in shaft lateral surface, the lower circle is moved down circle by electric handpiece case /V；And
Spacer, for being set in shaft, the spacer includes spacer ring, and the spacer ring is installed on the self-aligning bearing and institute
It states between thrust bearing.
In technical solution provided by the utility model, the thrust bearing is installed, the thrust bearing bears to carry vertically
Lotus so that the weight of latent oil direct driving motor is loaded on electric handpiece case, and righting shaft is being played by the self-aligning bearing
Effect, the thrust bearing are applied in combination with the self-aligning bearing, instead of stopping for high speed submersible motor of the prior art
Suitable for low speed latent oil direct driving motor, it is straight for low speed latent oil to solve the thrust bearing of former high speed submersible motor for thrust bearing
Drive flimsy problem in motor.
Description of the drawings
It in order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, other attached drawings can also be obtained according to the structure shown in these attached drawings.
Fig. 1 is the perspective exploded view of an embodiment of low speed combined bearing structure provided by the utility model；
Fig. 2 is the sectional view of low speed combined bearing structure (assembling) in Fig. 1；
Fig. 3 is the stereoscopic schematic diagram of electric handpiece case in Fig. 1；
Fig. 4 is the stereoscopic schematic diagram of shaft (upper end) in Fig. 1；
Fig. 5 is the stereoscopic schematic diagram of spacer in Fig. 1；
Fig. 6 is the stereoscopic schematic diagram of lasso in Fig. 1.
Drawing reference numeral explanation：
| Label | Title | Label | Title |
| 100 | Low speed combined bearing structure | 5 | Clip |
| 1 | Self-aligning bearing | 6 | Lasso |
| 11 | Outer ring | 61 | Second stop surface |
| 12 | Inner ring | 7 | Elastic spring |
| 2 | Thrust bearing | 1a | Electric handpiece case |
| 21 | Upper circle | 11a | First stop surface |
| 22 | Lower circle | 12a | 3rd annular groove |
| 3 | Spacer | 2a | Shaft |
| 31 | Spacer ring | 21a | Second keyway |
| 32 | Lower body | 22a | First annular slot |
| 33 | Upper sleeve body | 23a | Second annular groove |
| 34 | First keyway | 8 | First hole baffle ring |
| 4 | Key |
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that described embodiment is only the part of the embodiment rather than whole of the utility model
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work premise
Lower all other embodiments obtained, shall fall within the protection scope of the present invention.
If it is to be appreciated that relating to directionality instruction in the utility model embodiment, directionality instruction is only used for solving
Relative position relation, motion conditions under a certain particular pose between each component etc. are released, if the particular pose changes
When, then directionality instruction also correspondingly changes correspondingly.
It if, should " first ", " the in addition, relate to the description of " first ", " second " etc. in the utility model embodiment
Two " etc. description is only used for description purpose, and it is not intended that instruction or implying its relative importance or implicit indicating meaning
The quantity of the technical characteristic shown." first " is defined as a result, the feature of " second " can express or implicitly include at least one
A this feature.In addition, the technical solution between each embodiment can be combined with each other, but must be with ordinary skill
Personnel can be implemented as basis, and this technical side is will be understood that when the combination appearance of technical solution is conflicting or can not realize
The combination of case is not present, also not within the protection domain of the requires of the utility model.
Former latent oil direct driving motor use high speed submersible motor thrust bearing, high speed thrust bearing be sliding bearing, rotating speed
For 2850 revs/min, dynamic and static piece of bearing point forms oil film between sound block when running at high speed, realizes the lubrication of bearing, still, dives
Oily 50 revs/min of direct driving motor minimum speed 300 revs/min or so during high speed, is not easy to form oil film, easily cause between sound block
Quiet piece of abrasion.
The utility model proposes a kind of low speed combined bearing structure, Fig. 1 to Fig. 6 combines for low speed provided by the utility model
The schematic diagram of one embodiment of bearing arrangement.
Also referring to Fig. 1 and Fig. 2, the low speed combined bearing structure 100 include self-aligning bearing 1, thrust bearing 2 and every
Set 3, wherein, the self-aligning bearing 1 has the inner ring 12 of inside and outside distribution and outer ring 11, and the outer ring 11 is used to be socketed on motor head
In the inner wall of shell 1a upper ends, for the inner ring 11 for being socketed in shaft 2a lateral surfaces, the thrust bearing 2 is loaded on the tune
Mandrel holds 1 lower section, and the thrust bearing 2 has the upper circle 21 of upward and downward distribution and lower circle 22, and 21 outer diameters of the upper circle are small
In 22 outer diameters of the lower circle, for being socketed in electric handpiece case 1a, the upper circle 21 is used to be socketed in shaft the lower circle 22
On 2a lateral surfaces, the lower circle 22 is moved down by electric handpiece case 1a /Vs, and the spacer 3 is used to be set in shaft 2a,
The spacer 3 includes spacer ring 31, and the spacer ring 31 is installed between the self-aligning bearing 1 and the thrust bearing 2.
In technical solution provided by the utility model, the thrust bearing 2 is installed, the thrust bearing 2 is born vertically
Load so that the weight of latent oil direct driving motor is loaded on electric handpiece case 1a, and righting is being played by the self-aligning bearing 1
Shaft 2a is acted on, and the thrust bearing 2 is applied in combination with the self-aligning bearing 1, instead of high speed latent oil of the prior art
The thrust bearing of motor suitable for low speed latent oil direct driving motor, solves the thrust bearing of former high speed submersible motor for low
Flimsy problem in quick dive oil direct driving motor.
In order to strengthen the righting effect of the self-aligning bearing 1, the self-aligning bearing 1 is double-row self-aligning roller bearing, can be held
By larger radial load, while it can also bear certain axial load so that the low speed combined bearing structure 100 can fit
With more complicated operating mode；Further, the thrust bearing 2 is self-aligning thrust roller bearing, further strengthens the tune
Mandrel holds 1 righting effect, obtains the low speed combined bearing structure 100 and is applicable in more complicated operating mode.
The utility model also proposes a kind of latent oil direct driving motor, and the latent oil direct driving motor includes electric handpiece case 1a, turns
Axis 2a and low speed combined bearing structure 100, wherein, the electricity handpiece case 1a has upward and downward through the inner cavity set, described
Shaft 2a is rotatablely installed in the interior intracavitary, and the low speed combined bearing structure 100 is installed on the upper end of the inner cavity, and is located at
Between electricity handpiece case 1a and the shaft 2a, the low speed combined bearing structure 100 is using above-described embodiment whole
Technical solution, therefore technique effect caused by the similary technical solution with above-described embodiment.
In order to which the lower circle 22 of thrust bearing 2 described in /V moves down, in the present embodiment, please refer to Fig.1 and Fig. 3, it is described
The internal face of electric handpiece case 1a is set in ladder, to form a first stop surface 11a upward, under the thrust bearing 2
It encloses 22 lower surfaces to abut with the first stop surface 11a, passes through first stop surface so that the weight quilt of latent oil direct driving motor
It is loaded on electric handpiece case 1a.
The spacer 3 plays the role of the isolation self-aligning bearing 1 and the thrust bearing 2, the essence that bearing fit needs
Degree is higher, and corresponding countershaft 2a machining accuracies have higher requirement, and since shaft 2a is very long, weight is very heavy, for turning
The upper end machining high-precision size of axis 2a, it is difficult, in embodiment provided by the utility model, also referring to Fig. 1, Fig. 4
And Fig. 5, the spacer 3 further include the lower body 32 extended downwardly from the spacer ring 31 and are upwardly extended from the spacer ring 31 upper
Body 33, the inner ring 12 are sheathed on 33 lateral surface of upper sleeve body, and the upper sleeve body 33 is interference fitted with the inner ring 12,
The upper circle 21 is sheathed on 32 lateral surface of lower body, the lower body 32 and upper 21 interference fit of circle, it is described every
Set 3 internal face be equipped with the first keyway 34, the shaft 2a be equipped with the 34 corresponding second keyway 21a of the first keyway,
The latent oil direct driving motor further includes key 4, and the key 4 is installed in first keyway 34 and the second keyway 21a, passes through
The spacer 3 is connected by the key 4 with shaft 2a, by ensureing the relevant machining accuracy of 3 lateral surface of spacer, with institute
It states self-aligning bearing 1 and the thrust bearing 2 coordinates, reduce difficulty of processing, reduce manufacture cost.
In order to enable the spacer 3 be connected with shaft 2a it is more firm, first keyway 34, the second keyway 21a and
The key 4 is arranged in groups in one-to-one corresponding, and setting is multigroup, is evenly distributed on along in the circumferential direction of shaft 2a so that all directions
Upper uniform force.
It is moved up to limit the self-aligning bearing 1, in an embodiment provided by the utility model, also referring to figure
4th, Fig. 5 and Fig. 6, shaft 2a upper end lateral surface are equipped at intervals with first annular slot 22a and the second annular groove 23a, and first ring
Between the second annular groove 23a and the self-aligning bearing 1, the low speed combined bearing structure 100 further includes shape slot 22a
Clip 5, lasso 6 and elastic spring 7, the clip 5 include two semi-circular snap-gauges, and described two snap-gauges are arranged in described first
In annular groove 22a, the lower surface of the snap-gauge and the upper surface of the upper sleeve body 33 push against, upward with upper sleeve body described in /V 33
Mobile, the lasso 6 is sheathed on the lateral surface of clip 5, and the internal face of the lasso 6 is set in step, downward with formation one
Second stop surface 61, the upper surface of second stop surface 61 and the clip 5 push against, and the elastic spring 7 is installed on described
In second annular groove 23a, the upper surface of the lateral surface of the elastic spring 7 and the lasso 6 pushes against, with lasso 6 described in /V,
Self-aligning bearing 1 described in 5 /V of clip, clip 5 described in 6 /V of lasso, lasso 6 described in 7 /V of elastic spring
It moves up, overall construction intensity is high, and good limit effect, service life is long, is suitble to the application scenario of operating mode complexity.
In other embodiment provided by the utility model, the low speed combined bearing structure 100 further includes first axle card
Spring, shaft 2a upper ends lateral surface are equipped with first annular slot 22a, and the first annular slot 22a is located at the upper of the self-aligning bearing 1
Side, the first axle clamp spring is installed in the first annular slot 22a, with upper sleeve body described in /V 33 and the self-aligning bearing 1
It moves up, it is simple in structure by setting the first axle clamp spring, while upper sleeve body 33 described in /V and the self-aligning bearing 1,
It is convenient to assemble and disassemble.
In order to simultaneously self-aligning bearing 1 described in /V 11 structure of inside and outside circle, reach aligning axis described in further /V
1 purpose is held, the internal face of electric handpiece case 1a is equipped with the 3rd annular groove 12a, and the low speed combined bearing structure 100 is also
Including the first hole baffle ring 8, first hole baffle ring 8 is installed in the 3rd annular groove 12a, with outer ring 11 described in /V
It moves up, while /V is carried out to the inside and outside circle 11 of the self-aligning bearing 1, ensure that the low speed combined bearing structure 100
Stability.
The utility model also proposes a kind of oil extraction system, and the oil extraction system includes latent oil direct driving motor, and the latent oil is straight
Drive the technical solution that motor uses above-described embodiment whole, therefore skill caused by the similary technical solution with above-described embodiment
Art effect.
The above is only the preferred embodiment of the present invention, and it does not limit the scope of the patent of the present invention,
It is every under the design of the utility model, equivalent structure transformation made based on the specification and figures of the utility model or
Directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.
Claims (10)
1. a kind of low speed combined bearing structure, for being mounted on the electric handpiece case of latent oil direct driving motor with rotational installation in motor
Between shaft in head shell, which is characterized in that the low speed combined bearing structure includes：
Self-aligning bearing has inner ring and the outer ring of inside and outside distribution, and the outer ring is for being socketed in electric handpiece case, the inner ring
For being fixed by socket in shaft lateral surface；
Thrust bearing is installed on the lower section of the self-aligning bearing, and the thrust bearing has the Shang Quan of upward and downward distribution and lower circle,
And the outer diameter of the upper circle is less than the outer diameter of the lower circle, the lower circle for being socketed in electric handpiece case, use by the upper circle
In being fixed by socket on shaft lateral surface, the lower circle is moved down by electric handpiece case /V；And
Spacer, for being set in shaft, the spacer includes spacer ring, and the spacer ring is installed on the self-aligning bearing and described pushes away
Between power bearing.
2. low speed combined bearing structure as described in claim 1, which is characterized in that the self-aligning bearing is double-row self-aligning roller
Bearing；And/or
The thrust bearing is self-aligning thrust roller bearing.
3. a kind of latent oil direct driving motor, which is characterized in that including：
Electric handpiece case has upward and downward through the inner cavity set；
Shaft is rotatablely installed in the inner cavity；And
Low speed combined bearing structure is installed on the upper end of the inner cavity, and between the electric handpiece case and the shaft,
The low speed combined bearing structure is the low speed combined bearing structure as described in claim 1 to 2 any one.
4. latent oil direct driving motor as claimed in claim 3, which is characterized in that the internal face of the electricity handpiece case is set in ladder
It puts, to form first stop surface upward, the Xia Quan lower surfaces of the thrust bearing are abutted with first stop surface.
5. latent oil direct driving motor as claimed in claim 3, which is characterized in that the spacer is further included from the spacer ring to downward
The lower body stretched and the upper sleeve body upwardly extended from the spacer ring, the inner ring is sheathed on the upper sleeve body lateral surface, described
Upper sleeve body and the inner ring are interference fitted, and described be taken in is trapped arranged on described on outside, the lower body with it is described on
Circle interference fit；
The internal face of the spacer is equipped with the first keyway, and the shaft is equipped with the second keyway corresponding with first keyway,
The latent oil direct driving motor further includes key, and the key is installed on first keyway and second keyway.
6. latent oil direct driving motor as claimed in claim 5, which is characterized in that first keyway, second keyway and institute
It states key and is arranged to multigroup in one-to-one corresponding.
7. latent oil direct driving motor as claimed in claim 5, which is characterized in that further include first axle clamp spring；
Shaft upper end lateral surface is equipped with first annular slot, and the first annular slot is located at the top of the self-aligning bearing, institute
It states first axle clamp spring to be installed in the first annular slot, be moved up with upper sleeve body described in /V and the self-aligning bearing.
8. latent oil direct driving motor as claimed in claim 5, which is characterized in that shaft upper end lateral surface is equipped at intervals with first
Annular groove and the second annular groove, and the first annular slot is between second annular groove and the self-aligning bearing, it is described
Latent oil direct driving motor further includes：
Clip, including two semiorbicular snap-gauges, described two snap-gauges are arranged in the first annular slot, under the snap-gauge
Surface and the upper surface of the upper sleeve body push against, and are moved up with upper sleeve body described in /V；
Lasso is sheathed on the lateral surface of clip, and the internal face of the lasso is set in step, to form a second downward backstop
Face, the upper surface of second stop surface and the clip push against；And
Elastic spring is installed in second annular groove, and the lateral surface of the elastic spring and the upper surface of the lasso are supported
Tightly, moved up with lasso described in /V.
9. latent oil direct driving motor as claimed in claim 7 or 8, which is characterized in that set on the internal face of the electricity handpiece case
There is the 3rd annular groove；
The latent oil direct driving motor further includes the first hole baffle ring, and first hole is installed on the 3rd annular groove with baffle ring
It is interior, it is moved up with outer ring described in /V.
10. a kind of oil extraction system, which is characterized in that including the latent oil direct driving motor as described in claim 3 to 9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721527781.5U CN207442597U (en) | 2017-11-13 | 2017-11-13 | Low speed combined bearing structure, latent oil direct driving motor and oil extraction system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721527781.5U CN207442597U (en) | 2017-11-13 | 2017-11-13 | Low speed combined bearing structure, latent oil direct driving motor and oil extraction system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207442597U true CN207442597U (en) | 2018-06-01 |
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ID=62289673
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721527781.5U Active CN207442597U (en) | 2017-11-13 | 2017-11-13 | Low speed combined bearing structure, latent oil direct driving motor and oil extraction system |
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| CN (1) | CN207442597U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114684312A (en) * | 2021-07-20 | 2022-07-01 | 建德市五星车业有限公司 | Power-assisted output mechanism, mounting method thereof and electric power-assisted bicycle |
-
2017
- 2017-11-13 CN CN201721527781.5U patent/CN207442597U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114684312A (en) * | 2021-07-20 | 2022-07-01 | 建德市五星车业有限公司 | Power-assisted output mechanism, mounting method thereof and electric power-assisted bicycle |
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