CN212172443U - Middle axle transmission mechanism of electric bicycle - Google Patents
Middle axle transmission mechanism of electric bicycle Download PDFInfo
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- CN212172443U CN212172443U CN202020759086.7U CN202020759086U CN212172443U CN 212172443 U CN212172443 U CN 212172443U CN 202020759086 U CN202020759086 U CN 202020759086U CN 212172443 U CN212172443 U CN 212172443U
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- electric bicycle
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 75
- 230000007246 mechanism Effects 0.000 title claims abstract description 63
- 230000009467 reduction Effects 0.000 claims description 22
- 230000007480 spreading Effects 0.000 claims description 2
- 238000003892 spreading Methods 0.000 claims description 2
- 230000004044 response Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- ZMHWQAHZKUPENF-UHFFFAOYSA-N 1,2-dichloro-3-(4-chlorophenyl)benzene Chemical compound C1=CC(Cl)=CC=C1C1=CC=CC(Cl)=C1Cl ZMHWQAHZKUPENF-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The utility model discloses an electric bicycle's axis drive mechanism, include: the middle shaft is used for mounting a crank and a pedal to bear the riding pedaling force; the main chain wheel transmits pedal force to a driving chain wheel of the electric bicycle through a sleeved chain; the electric driving mechanism is arranged in the shell together with the middle shaft and is provided with an output shaft which is used for outputting power and is parallel to the middle shaft; it is characterized in that the main fluted disc is fixed on an output shaft, and the middle shaft is in transmission connection with the output shaft through a gear transmission mechanism. The utility model relates to an anti-conventional design fixes the main fluted disc on the output shaft with the parallel electric drive mechanism of axis for mechanism overall structure is compacter, and the volume is littleer, and transmission efficiency is higher.
Description
Technical Field
The utility model relates to an electric bicycle's axis drive mechanism.
Background
The middle shaft transmission mechanism of the electric bicycle is a general name of a whole set of power mechanism comprising a motor, a middle shaft, a clutch, a speed reducing mechanism, a torque sensor and a chain wheel. The structure forms of the middle shaft transmission mechanism in the prior art are various, and the final transmission efficiency and the whole volume of the mechanism are different due to different structures.
A middle shaft transmission mechanism widely applied in the industry of the electric bicycle at present is in a side hanging mode, a middle shaft of the middle shaft transmission mechanism is arranged in parallel with an output shaft of a motor, and a middle shaft sleeve for arranging the middle shaft is led out of a shell so as to be inserted into a frame five-way pipe of a universal specification on the market, so that the motor does not need to be matched with a special hanging bracket, can be matched with frames of most specifications on the market, and has good adaptability.
As is well known, in the existing inherent structural form of the middle shaft transmission mechanism, a chain wheel is usually fixed with a middle shaft, the power at the motor end is decelerated by a deceleration mechanism, transmitted to the middle shaft by a one-stage or multi-stage transmission gear, transmitted to the chain wheel by the middle shaft, and finally transmitted to a rear wheel to drive the electric bicycle to run by the chain wheel; when the bicycle is ridden, the force of the pedal of a person is transmitted to the middle shaft through the crank, then transmitted to the chain wheel, and finally transmitted to the rear wheel driving electric bicycle through the chain by the chain wheel to run.
However, in practice, the above-mentioned inherent design of the bottom bracket bearing drive increasingly suffers from the following disadvantages:
1) the power output of the motor is transmitted through the speed reducing mechanism and also transmitted to the chain wheel through the middle one-stage or multi-stage gear transmission mechanism, so that the transmission loss is large, and the transmission efficiency cannot be effectively improved all the time;
2) the larger size of the crankset coupled with its geared design with the central shaft and the interior leads to an overall structure that cannot be further compacted, but the crankset cannot be made smaller because it is directly mounted on the central shaft, the specifications being designed according to the transmission ratio and the human pedaling rate, which is not desirable or permissible in design if the crankset is made smaller, which may increase the human pedaling rate.
Therefore, a middle shaft transmission mechanism of an electric bicycle with a more compact structure, a smaller volume and higher transmission efficiency is urgently needed in the industry.
Disclosure of Invention
The utility model discloses the purpose is: the middle shaft transmission mechanism of the electric bicycle is more compact in structure, small in size and high in transmission efficiency.
The technical scheme of the utility model is that: a bottom bracket drive mechanism for an electric bicycle, comprising:
the middle shaft is used for mounting a crank and a pedal to bear the riding pedaling force;
the main chain wheel transmits pedal force to a driving chain wheel of the electric bicycle through a sleeved chain;
the electric driving mechanism is arranged in the shell together with the middle shaft and is provided with an output shaft which is used for outputting power and is parallel to the middle shaft;
the gear transmission mechanism is characterized in that the main fluted disc is fixed on an output shaft, and the middle shaft is in transmission connection with the output shaft through the gear transmission mechanism; the chain expanding device further comprises at least one auxiliary chain wheel which is pivotally arranged on the shell and used for expanding the chain.
Further, in the utility model discloses in electric drive mechanism include motor core, reduction gears, first clutch and the output shaft, motor core's core axle links to each other through the outer lane of reduction gears and first clutch, and the inner circle of first clutch is fixed on the output shaft. Of course, the motor core can adopt an inner rotor outer stator or an outer rotor inner stator in any form, and the utility model discloses do not have the limit to this.
Further, in the utility model discloses in reduction gears is planet reduction gears, including the shaping in the ring gear on shells inner wall, center on a plurality of and ring gear meshing's that the core axle distributes planetary gear, these planetary gear simultaneously with locate the epaxial shaft gear meshing of core, each planetary gear's center pivot is equipped with the planet axle, and the planet axle is fixed with the outer lane of first clutch. Of course, besides the planetary reduction mechanism, the reduction mechanism of the present invention may also adopt any conventionally known inner fitting or outer fitting reduction mechanism.
Still further, in the utility model discloses in be equipped with the support ring between motor core and the planet reduction gears, this support ring with the outer lane of first clutch is together fixed the planet axle, the support ring is in through a coaxial bearing rotation assembly on the core axle.
Further, in the utility model discloses in gear drive includes first drive gear, second drive gear, idler and second clutch, and first drive gear adopts the bearing to install epaxially to first drive gear inboard is fixed with the outer lane of second clutch, and the inner circle of second clutch is fixed with the axis, and second drive gear fixes on the output shaft, the idler pivot is installed in the casing, and this idler all meshes with first drive gear and second drive gear.
Still further, the utility model discloses in still include torque sensor, it is located the axis perhaps on the output shaft, for example choose for use conventional magnetic ring hall sensor (axle sleeve formula), it is including fixing the deformation axle sleeve on axis or output shaft and fixing on the casing and be located deformation axle sleeve outlying hall element support, be fixed with the response magnetic ring position sleeve on the deformation axle sleeve, be fixed with the response magnetic ring along the circumference on this response magnetic ring position sleeve, and be fixed with on the hall element support with response magnetic ring complex hall element, hall element is connected with electric bicycle's the controller electricity that is used for driving motor core moving. As long as the middle shaft is stressed, the sensor can sense signals to the controller to drive the motor core to operate.
Or the torque sensor can be arranged at the idler pulley and specially designed to comprise a sensor deformation support arranged in the shell, the idler pulley is pivotally arranged on the sensor deformation support, a strain gauge and a PCB electrically connected with the strain gauge are fixed on the sensor deformation support, and the PCB is electrically connected with a controller of the electric bicycle for driving the motor core to run; and the centers of the first transmission gear, the second transmission gear and the idler gear are distributed in a triangular shape. When a person treads the pedal to enable the middle shaft to be stressed and rotated, the meshed second clutch drives the first transmission gear to rotate and then drives the idle gear to rotate, and the stress of the idle gear enables the strain gauge on the sensor deformation support to be deformed to generate a sensing signal which is transmitted to the controller, so that the controller drives the motor core to operate.
Still further, in the present invention, the diameter of the first transmission gear is larger than that of the idle gear, and the diameter of the second transmission gear is smaller than that of the idle gear or the same as that of the idle gear.
Furthermore, the utility model discloses in still include the pivot and locate on the casing and be used for strutting an at least supplementary chain wheel of chain.
The utility model discloses the theory of operation as follows:
the motor core operating condition, core axle output torque, through reducing mechanism and first clutch transmission to output shaft and main chain wheel on, the last main chain wheel is through the chain with the transmission of torque to electric bicycle's drive sprocket on, the drive electric bicycle marchs. In this state, the first transmission gear is disengaged from the middle shaft due to the action of the second clutch.
The people ride and trample operating condition, and the foot is incessantly trampled pedal on the crank, and on the moment of torsion transmitted to first drive gear through well axle through the second clutch, first drive gear rethread idler transmitted the moment of torsion to second drive gear on, and then transmitted to output shaft and main chain wheel, on last main chain wheel transmitted the moment of torsion to electric bicycle's drive sprocket through the chain equally, drive electric bicycle marched. In this state, the output shaft is disengaged from the planetary reduction mechanism due to the action of the first clutch.
The utility model has the advantages that:
1) the utility model relates to an anti-conventional design fixes the main fluted disc on the output shaft with the parallel electric drive mechanism of axis, and the power take off of motor core need not like conventional technique again through middle one-level or multistage gear drive mechanism after reducing gear and transmits to main fluted disc again, reduction transmission loss that can be very big effectively promotes transmission efficiency.
) The utility model discloses in with main chain wheel snap-on electric drive mechanism's output shaft, rather than in the epaxial, the speed that the specification of main chain wheel no longer receive transmission speed ratio and people to trample requires the restriction like this, can further change the small-size. And after the size of the main gear disc is changed to be small, the structural design of the whole middle shaft transmission mechanism is more compact, and the volume of the shell part can be made smaller.
) The main chain wheel needs to design the chain wheel connecting sleeve to assemble with the middle shaft and the internal gear transmission mechanism in the conventional technology, and the utility model provides a main chain wheel installs very conveniently simply, can improve assembly efficiency to owing to also cancelled the chain wheel connecting sleeve, reduced spare part, further simplified the structure, so also reduced manufacturing cost simultaneously.
) The utility model discloses an among the preferred scheme, with the position department of torque sensor design at the idler, do not adopt the torque sensor of original design at axis or the epaxial axle sleeve formula of output to sensor structure is through redesign, can reduce the volume like this, reduction in production cost, effective utilization and optimization axis drive mechanism inner structure.
Drawings
The invention will be further described with reference to the following drawings and examples:
FIG. 1 is a cross-sectional view of an embodiment of the present invention;
FIG. 2 is an exterior crankset view of the housing of the embodiment of FIG. 1;
fig. 3 is a front view of the sensor deformation bracket of the embodiment of fig. 1 (including its positional relationship with the first drive gear, the second drive gear, and the idler gear).
Wherein: 1. a middle shaft; 2. a crank; 3. a master chain wheel; 4. a chain; 5. a drive sprocket; 6. a housing; 7. an output shaft; 8. a motor core; 8a, a machine core shaft; 9. a first clutch; 10. a ring gear; 11. a planetary gear; 12. a shaft gear; 13. a planet shaft; 14. a support ring; 15. a coaxial bearing; 16. a first drive gear; 17. a second transmission gear; 18. an idler pulley; 19. a second clutch; 20. a sensor deformation support; 21. a strain gauge; 22. a PCB board; 23. an auxiliary chain wheel; 24. an electric bicycle frame; 25. the frame five-way pipe.
Detailed Description
Example (b): referring to fig. 1 to 3, the middle shaft transmission mechanism of the electric bicycle provided by the present invention is described as follows:
the structure of the middle shaft transmission mechanism of the electric bicycle mainly comprises a middle shaft 1, a crank 2, a main toothed disc 3, a shell 6, an output shaft 7, a motor core 8, a core shaft 8a, a planetary reduction mechanism, a first clutch 9, a gear ring 10, a support ring 14, a coaxial bearing 15, a gear transmission mechanism, a second clutch 19, a torque sensor and an auxiliary toothed disc 23.
First, as shown in fig. 1, the housing 6 is composed of an upper housing and a lower housing which are connected with each other at the middle, the middle axle 1 is installed in the lower housing of the housing 6 by a plurality of bearings (not shown) as in the conventional art, and then is inserted into the frame five-way tube 25 of the electric bicycle frame 24 to be fixed. The two ends of the middle shaft 1 are used for mounting a crank 2 and a pedal (not shown) to bear riding pedaling force.
The motor core 8, the planetary reduction mechanism, the first clutch 9 and the output shaft 7 are all arranged in the upper shell of the shell 6, wherein the motor core 8 adopts an inner rotor outer stator form, a core shaft 8a fixed on the rotor extends out to be connected with an outer ring of the first clutch 9 through the planetary reduction mechanism, an inner ring of the first clutch 9 is fixed on the output shaft 7, and the output shaft 7 is assembled in the upper shell by adopting a plurality of bearings (not marked in the figure) and is parallel to the middle shaft 1.
The planetary reduction mechanism in this embodiment is composed of a ring gear 10 formed on the inner wall of the housing 6, three planetary gears 11 arranged around the core shaft 8a and engaged with the ring gear 10, a shaft gear 12 engaged with the three planetary gears 11 and provided on the core shaft 8a, and planetary shafts 13 pivotally provided at the centers of the planetary gears 11, and these planetary shafts 13 are fixed to the outer race of the first clutch 9.
As shown in fig. 1, a support ring 14 is disposed between the motor core 8 and the planetary reduction mechanism in this embodiment, the support ring 14 fixes the planetary shaft 13 together with the outer ring of the first clutch 9, and the support ring 14 is rotatably mounted on the core shaft 8a through a coaxial bearing 15.
One end of the output shaft 7 extends out of the housing 6 to fix the main chain wheel 3, and the main chain wheel 3 transmits pedaling force to the driving sprocket 5 installed at the rear of the electric bicycle frame 24 through the sheathing chain 4.
Meanwhile, as shown in fig. 2, two auxiliary crankshafts 23 are symmetrically and pivotally mounted on the lower housing of the housing 6 in the embodiment at the upper and lower sides of the central shaft 1 for spreading the chain 4, so as to better transmit torque and avoid possible interference between the chain 4 and the crank 2.
Referring back to fig. 1, in the present embodiment, the central shaft 1 is in transmission connection with the output shaft 7 through a gear transmission mechanism.
The gear transmission mechanism is composed of a first transmission gear 16, a second transmission gear 17, an idler gear 18 and a second clutch 19, wherein the first transmission gear 16 is installed on the middle shaft 1 by adopting a plurality of bearings (not marked in the figure), the inner side of the first transmission gear 16 is fixed with the outer ring of the second clutch 19, the inner ring of the second clutch 19 is fixed with the middle shaft 1, the second transmission gear 17 is fixed on the output shaft 7, the idler gear 18 is pivotally installed in the shell 6, and the idler gear 18 is meshed with the first transmission gear 16 and the second transmission gear 17.
And in the present embodiment, a torque sensor is provided at the idle gear 18, the torque sensor includes a sensor deformation bracket 20 fixed in the housing 6, the idle gear 18 is pivotally mounted on the sensor deformation bracket 20, and as shown in fig. 3, a strain gauge 21 and a PCB 22 electrically connected to the strain gauge 21 are fixed on the sensor deformation bracket 20, and the PCB 22 is electrically connected to a controller (omitted in the figure) of the electric bicycle for driving the motor core 8 to operate. And the centers of the first transmission gear 16, the second transmission gear 17 and the idle gear 18 are distributed in a triangle in this embodiment. While the first transmission gear 16 has a larger diameter than the idle gear 18 and the second transmission gear 17 has a smaller diameter than the idle gear 18.
The utility model discloses the theory of operation as follows:
when the motor core 8 is in a working state, a person treads a pedal on the crank 2, the middle shaft 1 rotates under stress, the first transmission gear 16 is driven to rotate through the meshed second clutch 19, then the idler pulley 18 is driven to rotate, the idler pulley 18 deforms under stress so as to generate a sensing signal which is transmitted to the controller, and the controller drives the motor core 8 to operate. The machine core shaft 8a outputs torque, the torque is transmitted to the output shaft 7 and the main chain wheel 3 through the planetary speed reducing mechanism and the first clutch 9, and finally the main chain wheel 3 transmits the torque to the driving chain wheel 5 of the electric bicycle through the chain 4 to drive the electric bicycle to move. After the mandrel 8a rotates, the second transmission gear 17 drives the idle gear 18 and the first transmission gear 16 to rotate reversely, so that the second clutch 19 is disengaged, and the first transmission gear 16 is disengaged from the middle shaft 1.
The people ride and trample operating condition, and the foot is incessantly trampled the foot on the crank 2, and the moment of torsion passes through on axis 1 and the second clutch 19 transmission to first drive gear 16 of interlock, and first drive gear 16 rethread idler 18 transmits the moment of torsion to second drive gear 17 on, and then transmits to output shaft 7 and main chain wheel 3 on, and last main chain wheel 3 is on the same drive sprocket 5 that transmits the moment of torsion to electric bicycle through chain 4, and the drive electric bicycle advances. The output shaft 7 is disengaged from the planetary reduction mechanism due to the action of the first clutch 9.
The above-mentioned embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which should not be construed as limiting the scope of the present invention. All modifications made according to the spirit of the main technical scheme of the present invention shall be covered within the protection scope of the present invention.
Claims (8)
1. A bottom bracket drive mechanism for an electric bicycle, comprising:
the middle shaft (1) is used for mounting a crank (2) and pedals to bear the riding pedaling force;
the main chain wheel (3) transmits pedal force to a driving chain wheel (5) of the electric bicycle through a sleeved chain (4);
the electric driving mechanism is arranged in the shell (6) together with the middle shaft (1) and is provided with an output shaft (7) which is used for outputting power and is parallel to the middle shaft (1);
it is characterized in that the main chain wheel (3) is fixed on an output shaft (7), and the middle shaft (1) is in transmission connection with the output shaft (7) through a gear transmission mechanism.
2. The bottom bracket bearing drive mechanism of the electric bicycle according to claim 1, wherein the electric drive mechanism comprises a motor core (8), a speed reduction mechanism, a first clutch (9) and the output shaft (7), the core shaft (8 a) of the motor core (8) is connected with the outer ring of the first clutch (9) through the speed reduction mechanism, and the inner ring of the first clutch (9) is fixed on the output shaft (7).
3. Bottom bracket drive of an electric bicycle according to claim 2, characterized in that the reduction mechanism is a planetary reduction mechanism comprising a ring gear (10) formed on the inner wall of the housing (6), a plurality of planet gears (11) arranged around the core shaft (8 a) and engaging with the ring gear (10), the planet gears (11) simultaneously engaging with a shaft gear (12) arranged on the core shaft (8 a), a planet shaft (13) being pivotally arranged at the center of each planet gear (11), the planet shaft (13) being fixed with the outer ring of the first clutch (9).
4. Bottom bracket drive of an electric bicycle according to claim 3, characterized in that a support ring (14) is arranged between the motor core (8) and the planetary reduction gear, which support ring (14) together with the outer ring of the first clutch (9) fixes the planetary shaft (13), which support ring (14) is rotatably mounted on the core shaft (8 a) by means of a coaxial bearing (15).
5. The bottom bracket shaft transmission mechanism of the electric bicycle according to claim 2, wherein the gear transmission mechanism comprises a first transmission gear (16), a second transmission gear (17), an idler gear (18) and a second clutch (19), the first transmission gear (16) is mounted on the bottom bracket shaft (1) by a bearing, the inner side of the first transmission gear (16) is fixed with the outer ring of the second clutch (19), the inner ring of the second clutch (19) is fixed with the bottom bracket shaft (1), the second transmission gear (17) is fixed on the output shaft (7), the idler gear (18) is pivotally mounted in the housing (6), and the idler gear (18) is meshed with both the first transmission gear (16) and the second transmission gear (17).
6. The bottom bracket shaft transmission mechanism of an electric bicycle according to claim 5, further comprising a torque sensor disposed on the bottom bracket shaft or the output shaft; or the torque sensor is arranged at an idler pulley (18) and comprises a sensor deformation support (20) arranged in the shell (6), the idler pulley (18) is pivotally mounted on the sensor deformation support (20), a strain gauge (21) and a PCB (22) electrically connected with the strain gauge (21) are fixed on the sensor deformation support (20), and the PCB (22) is electrically connected with a controller of the electric bicycle for driving the motor core (8) to operate; and the centers of the first transmission gear (16), the second transmission gear (17) and the idle gear (18) are distributed in a triangular shape.
7. Bottom bracket drive mechanism for electric bicycles, according to claim 5, characterized in that the first transmission gear (16) has a larger diameter than the idle gear (18) and the second transmission gear (17) has a smaller diameter than the idle gear (18) or the same diameter as the idle gear (18).
8. Bottom bracket drive mechanism for electric bicycles, according to claim 1, characterized by further comprising at least one auxiliary chain wheel (23) pivotally mounted on the housing (6) for spreading the chain (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020759086.7U CN212172443U (en) | 2020-05-09 | 2020-05-09 | Middle axle transmission mechanism of electric bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020759086.7U CN212172443U (en) | 2020-05-09 | 2020-05-09 | Middle axle transmission mechanism of electric bicycle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212172443U true CN212172443U (en) | 2020-12-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020759086.7U Withdrawn - After Issue CN212172443U (en) | 2020-05-09 | 2020-05-09 | Middle axle transmission mechanism of electric bicycle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212172443U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111391959A (en) * | 2020-05-09 | 2020-07-10 | 苏州盛亿电机有限公司 | Middle axle transmission mechanism of electric bicycle |
| CN115626243A (en) * | 2022-12-05 | 2023-01-20 | 浙江阿波罗运动科技股份有限公司 | Two-wheeled electric vehicle capable of being driven quickly |
-
2020
- 2020-05-09 CN CN202020759086.7U patent/CN212172443U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111391959A (en) * | 2020-05-09 | 2020-07-10 | 苏州盛亿电机有限公司 | Middle axle transmission mechanism of electric bicycle |
| CN111391959B (en) * | 2020-05-09 | 2024-10-18 | 苏州盛亿电机有限公司 | Center shaft transmission mechanism of electric bicycle |
| CN115626243A (en) * | 2022-12-05 | 2023-01-20 | 浙江阿波罗运动科技股份有限公司 | Two-wheeled electric vehicle capable of being driven quickly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20201218 Effective date of abandoning: 20241018 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20201218 Effective date of abandoning: 20241018 |