CN112224327A - Middle-arranged driving device of electric power-assisted bicycle - Google Patents
Middle-arranged driving device of electric power-assisted bicycle Download PDFInfo
- Publication number
- CN112224327A CN112224327A CN202011115684.1A CN202011115684A CN112224327A CN 112224327 A CN112224327 A CN 112224327A CN 202011115684 A CN202011115684 A CN 202011115684A CN 112224327 A CN112224327 A CN 112224327A
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- China
- Prior art keywords
- motor
- shaft
- harmonic reducer
- driving device
- middle shaft
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
- B62M6/45—Control or actuating devices therefor
- B62M6/50—Control or actuating devices therefor characterised by detectors or sensors, or arrangement thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
- B62M6/45—Control or actuating devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
- B62M6/55—Rider propelled cycles with auxiliary electric motor power-driven at crank shafts parts
Abstract
The invention discloses a middle-arranged driving device of an electric power-assisted bicycle, which comprises a motor, a harmonic reducer, a torque sensor, a clutch, a sealing cover, a flange plate and a middle shaft, wherein the motor is connected with the harmonic reducer through a transmission shaft; the motor is a direct current brushless motor, a motor shaft is connected with a cam shaft of the harmonic reducer, and a rigid wheel of the harmonic reducer outputs; the rigid wheel positioning seat is connected with the clutch, the clutch is an overrunning clutch, and the clutch is connected with the middle shaft to realize one-way transmission; the middle shaft is connected with a chain wheel to provide auxiliary power for the power-assisted bicycle; and finally, the shell of the motor is connected with the flexible gear positioning seat of the harmonic reducer and the sealing cover through the flange plate and is fixedly installed on the moped bracket. The intelligent auxiliary bicycle integrates the direct-current brushless motor, the harmonic reducer, the overrunning clutch and the torque sensor, can realize intelligent auxiliary riding, has stable power output, and makes the manual riding easier.
Description
Technical Field
The invention belongs to the technical field of electric power-assisted bicycles, and particularly relates to a middle-arranged driving device of an electric power-assisted bicycle.
Background
Electric bicycle is an electronic supplementary bicycle of riding, and the difference lies in with ordinary bicycle, and electric bicycle is equipped with motor drive, can make the manpower ride more easily according to certain proportion output power assistance and ride to help improving duration.
At present, most of electric power-assisted bicycles are driven by hub motors, for example, in Chinese patent application 'a power-assisted bicycle rear wheel driving device (202010379726.6)', an outer rotor motor is connected with the inner wall of a rear wheel and directly drives and runs, and the rear hub direct drive has the problems of lower transmission efficiency, poorer climbing performance and the like, and can not well meet the riding requirement of complex road conditions; a part of electric power-assisted bicycles are driven by a gear-reduction middle-mounted motor, for example, in Chinese patent application 'a driving and speed-changing integrated middle-mounted device and an electric power-assisted bicycle (202010494664.3)' and Chinese patent 'a middle-mounted driving mechanism and a power-assisted bicycle (201921301386.4) with the middle-mounted driving mechanism', the gear-reduction middle-mounted motor has the problems of unstable transmission, easy abrasion of gears and the like, and the driving device is easy to break down.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides the middle-arranged driving device of the electric power-assisted bicycle, which has stable power output and better climbing performance.
In order to achieve the aim, the invention provides a middle-arranged driving device of an electric power-assisted bicycle, which comprises a motor, a harmonic reducer, an overrunning clutch, a middle shaft and a torque sensor,
the motor is fixed on a bracket of the bicycle;
the harmonic reducer comprises a flexible gear, a rigid gear and a wave generator, wherein the flexible gear is a fixed end, the rigid gear is an output end, the wave generator comprises a cam shaft, and the cam shaft is connected with a motor shaft of the motor;
the ratchet wheel and pawl overrunning clutch comprises pawls and a ratchet wheel, the pawls are connected with the rigid wheel, the ratchet wheel is connected with the middle shaft, and the middle shaft is connected with a chain wheel of the bicycle to provide auxiliary power for the bicycle;
the torque sensor is fixedly connected with the ratchet wheel to detect the torque of the middle shaft and transmit signals to the controller of the motor.
By adopting the technical scheme, the motor is connected with the harmonic reducer so as to improve the output torque by utilizing the large reduction ratio characteristic of the harmonic reducer; the motor is protected by utilizing the one-way transmission characteristic of the overrunning clutch, and the electromagnetic resistance when the bicycle is ridden by pure manpower is avoided; the overrunning clutch is connected with the middle shaft, outputs the power provided by the motor to the chain wheel and assists in manual riding; the torque sensor is fixedly arranged on the ratchet wheel, detects the torque of the middle shaft in real time and feeds the torque back to the controller of the motor, so that the controller controls the motor to output power in a certain proportion. The power-assisted bicycle realizes the cooperative driving of manpower and electric power, and the torque sensor can realize the function of a speed sensor, monitor the speed of the power-assisted bicycle and prevent overspeed.
The harmonic reducer is characterized by further comprising a sealing cover and a flange plate, wherein the sealing cover covers the harmonic reducer, the motor shaft and the middle shaft, the sealing cover is fixedly connected with a shell of the motor through the flange plate, and a flexible gear positioning seat of the harmonic reducer is fixed on the flange plate.
Furthermore, the middle shaft penetrates through the driving device, and a bearing and an elastic retainer ring are arranged at the junction of the middle shaft and the motor shell of the motor and at the junction of the middle shaft and the sealing cover.
Further, the camshaft is connected with a motor shaft of the motor through a second flat key.
Further, the flexible gear adopts a double-arc tooth shape.
Further, the material of flexspline is 40CrNiMoA, the rigid wheel is the nylon material.
Further, the motor is a brushless DC motor.
Compared with the prior art, the invention can realize the following beneficial effects: the integrated harmonic reducer can meet higher power requirements, is stable in transmission and more stable in power output; the driving device is arranged in the middle of the power-assisted bicycle, so that the gravity distribution of the whole bicycle is more reasonable, and the riding stability is improved; the torque of the middle shaft is detected in real time through the torque sensor, and the motor is controlled to output auxiliary power in a certain proportion, so that not only is the manual riding easier, but also the cruising ability of the battery is improved; the one-way transmission function of the overrunning clutch can reduce the damage of pure manpower riding to the motor and the electromagnetic resistance effect.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings that are needed to be used will be briefly described below, it being understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be considered as limiting the scope, and that for a person skilled in the art, other related drawings can also be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of an explosive structure according to the present invention.
Fig. 2 is a structural sectional view of the present invention.
Fig. 3 is a structural sectional view of the dc brushless motor according to the present invention.
Fig. 4 is a sectional view of the structure of the hat-type harmonic reducer according to the present invention.
FIG. 5 is a schematic view of the ratchet and pawl structure of the present invention.
Icon: 1-medial axis; 2-elastic retainer ring; 3-a first bearing; 4-a motor housing; 5-a controller; 6-a stator; 7-a rotor; 8-a second bearing; 9-a first flat bond; 10-motor shaft; 11-a flange plate; 12-a flexspline positioning seat; 13-lip tooth type sealing ring; 14-wave shaped gasket; 15-a third bearing; 16-a camshaft; 17-a flexspline; 18-a rigid wheel; 19-a compliant bearing; 20-bolt; 21-a first sealing ring; 22-rigid bearings; 23-a second sealing ring; 24-a rigid wheel positioning seat; 25-a pawl; 26-a circlip; 27-ratchet wheel; 28-torque sensor; 29-a sealing cover; 30-third flat bond; 31-second flat bond.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of the present invention. The components of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Referring to fig. 1 to 5, the central driving device of an electric power-assisted bicycle according to the present embodiment includes a motor, a harmonic reducer, an overrunning clutch, a torque sensor 28, and a central shaft 1 penetrating the central portion of the driving device. The motor is a direct current brushless motor, the rated power of the direct current brushless motor is 200W, the rated rotating speed is 3000rpm, and the motor shaft is of a hollow structure. The harmonic reducer is a hat-type harmonic reducer, and the torque sensor 28 is a magnetoelastic torque sensor.
Referring to fig. 3, the dc brushless motor includes a motor shaft 10, a stator 6, a rotor 7, a first bearing 3, a second bearing 8, a circlip 2, a controller 5, a motor housing 4, a first spline 9 connecting the rotor 7 and the motor shaft 10, and the like. The brushless dc motor is a mature product, and the connection relationship and the position relationship between the components are not described herein.
Referring to fig. 4, the top-hat harmonic reducer includes a wave generator, a flexible gear 17, a flexible gear positioning seat 12, a rigid gear 18, a rigid gear positioning seat 24, a rigid bearing 22, a lip-tooth type sealing ring 13, a wave-shaped gasket 14, a bearing 15, a first sealing ring 21, a second sealing ring 23, and the like, and the wave generator includes a cam shaft 16 and a flexible bearing 19. The top hat type harmonic reducer is an existing mature product, and the connection relation and the position relation among all components are aligned in the top hat type harmonic reducer without repeated description. The silk hat type harmonic reducer is a special harmonic reducer, adopts a double-circular-arc tooth shape, adopts interference fit between the cam shaft 16 and the flexible bearing 19, and the flexible gear 17 is fixedly arranged on the flexible gear positioning seat 12 and drives the rigid gear 18 to transmit torque through alternating meshing action.
Referring to fig. 5, the ratchet-pawl overrunning clutch is composed of a ratchet and a pawl, and has a one-way transmission function and an overrunning clutch function.
The motor shell 4 of the direct current brushless motor is fixed on a bracket of the bicycle, a cam shaft 16 of the harmonic reducer is connected with a motor shaft 10 of the motor through a second flat key 31, a flexible wheel 17 is a fixed end, and a rigid wheel 18 is an output end; the ratchet wheel and pawl overrunning clutch comprises a pawl 25 and a ratchet wheel 27, a rigid wheel 18 is fixedly connected with a rigid wheel positioning seat 24, the pawl 25 is connected with the rigid wheel positioning seat 24 through a bolt 20, the ratchet wheel 27 is fixedly connected with a middle shaft 1 through a third flat key 30, the middle shaft 1 is connected with a chain wheel of a bicycle to provide auxiliary power for the bicycle, the pawl 25 rotates under the driving of the rigid wheel positioning seat 24, the ratchet wheel 27 is driven to rotate through an occlusion effect, and then the middle shaft 1 is driven; the torque sensor 28 is fixedly connected with the ratchet wheel 27 to detect the torque of the middle shaft 1 and transmit signals to the controller of the motor. And one end of the ratchet 27 is positioned by the circlip 26 and the other end is connected to the torque sensor.
The embodiment further comprises a sealing cover 29 and a flange plate 11, the sealing cover 29 covers the harmonic reducer, the motor shaft 10 and the middle shaft 1, the sealing cover 29 is fixedly connected with the shell of the motor through the flange plate 11, and the flexible gear positioning seat 12 of the harmonic reducer is fixed on the flange plate 11. So set up, set up the sealed cowling and can play the guard action to harmonic speed reducer ware, motor shaft, axis etc. and can realize with whole drive arrangement fixed mounting on the moped support, protect drive arrangement not receive external influence, improve transmission stability.
Specifically, the motor shaft 10 is a hollow structure, two ends of the motor shaft are fixedly mounted on the motor housing 4 through the bearings 8, and one end of the motor shaft is connected with the cam shaft 16 through the second flat key 31 to transmit torque.
Specifically, the middle shaft 1 penetrates through the driving device, and a bearing and an elastic check ring are arranged at the junction of the middle shaft 1 and the motor shell 4 of the motor and at the junction of the middle shaft 1 and the sealing cover 29 to position the middle shaft and prevent the motion of the middle shaft from being influenced.
When the electric power-assisted bicycle middle driving device is used, the electric power-assisted bicycle middle driving device provided by the embodiment is arranged in the middle part of a bicycle such as a tripod, and is driven by manpower and electric power in a mixed mode, when the power-assisted bicycle is driven by manpower, the torque sensor 28 detects the torque on the middle shaft 1 and feeds the torque back to the controller 5, and the controller 5 controls the motor to output auxiliary power according to the ratio of 1:1 through analysis and calculation. The motor shaft 10 is connected with a cam shaft 16 of the harmonic reducer to output torque, the cam shaft 16 is connected with a flexible bearing 19 through interference fit, and the flexible bearing 19 is in interference fit with a flexible gear 17 to enable the flexible gear 17 to generate periodic elastic deformation. The flexible gear 17 is fixed, the rigid gear 18 rotates under the meshing action of the flexible gear 17, the rigid gear 18 is connected with the pawl 27, the pawl 27 is meshed with the ratchet wheel 25 to drive the middle shaft 1 to rotate, the middle shaft 1 is connected with the chain wheel, the chain wheel drives the rear wheel through a chain, and finally the power-assisted bicycle is driven to move forwards.
When the rotating speed of the ratchet wheel 27 under the manual driving is greater than the speed of the pawl 25, the ratchet wheel 27 is separated from the pawl 25, and when the motor is powered off, the ratchet wheel and the pawl are also in a separation state, the manual driving cannot be influenced by the motor, unnecessary damage to the motor can be well avoided, and the electromagnetic resistance action of the motor can be eliminated.
The embodiment integrates the direct current brushless motor, the harmonic reducer, the overrunning clutch and the torque sensor, can realize intelligent auxiliary riding, has stable power output, and makes manpower riding easier.
It should be noted that the centrally-mounted driving device for the electric power-assisted bicycle provided by the invention strictly complies with the relevant regulations of GB 17761-2018 (safety technical Specification of electric bicycles), the speed of the electric power-assisted bicycle is limited by the magnetoelastic torque sensor, when the speed exceeds 15km/m, the magnetoelastic torque sensor transmits a signal to the controller of the motor, the controller of the motor controls the buzzer arranged on the bicycle to give out buzzing sound to remind surrounding people, when the speed exceeds 25km/m, the motor is automatically powered off, and the motor cannot be started again until the speed is reduced to 15 km/m.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a put drive arrangement in electric bicycle which characterized in that: comprises a motor, a harmonic reducer, a ratchet wheel and pawl overrunning clutch, a middle shaft (1) and a torque sensor (28),
the motor is fixed on a bracket of the bicycle;
the harmonic reducer comprises a flexible gear (17), a rigid gear (18) and a wave generator, wherein the flexible gear (17) is a fixed end, the rigid gear (18) is an output end, the wave generator comprises a cam shaft (16), and the cam shaft (16) is connected with a motor shaft (10) of the motor;
the ratchet wheel and pawl overrunning clutch comprises a pawl (25) and a ratchet wheel (27), the pawl (25) is fixedly connected with the rigid wheel (18), the ratchet wheel (27) is fixedly connected with the middle shaft (1), and the middle shaft (1) is connected with a chain wheel of a bicycle to provide auxiliary power for the bicycle;
the torque sensor (28) is fixedly connected with the ratchet wheel (27) to detect the torque of the middle shaft (1) and transmit signals to the controller of the motor.
2. The central driving device of an electric power-assisted bicycle according to claim 1, characterized in that: the harmonic reducer is characterized by further comprising a sealing cover (29) and a flange plate (11), wherein the sealing cover (29) covers the harmonic reducer, the motor shaft (10) and the middle shaft (1), the sealing cover (29) is fixedly connected with a shell of the motor through the flange plate (11), and a flexible gear positioning seat (12) of the harmonic reducer is fixed on the flange plate (11).
3. The central driving device of an electric power-assisted bicycle according to claim 2, characterized in that: the middle shaft (1) penetrates through the driving device, and a bearing and an elastic retainer ring are arranged at the junction of the middle shaft (1) and the motor shell (4) of the motor and at the junction of the middle shaft (1) and the sealing cover (29).
4. The central driving device of an electric power-assisted bicycle according to claim 1, characterized in that: the camshaft (16) is connected with a motor shaft (10) of the motor through a second flat key (31).
5. The central driving device of an electric power-assisted bicycle according to claim 1, characterized in that: the flexible gear (17) adopts a double-arc tooth shape.
6. The central driving device of an electric power-assisted bicycle according to claim 1, characterized in that: the flexible gear (17) is made of 40CrNiMoA, and the rigid gear (18) is made of nylon.
7. The centrally-mounted driving device of an electric power-assisted bicycle according to any one of claims 1 to 6, characterized in that: the motor is a direct current brushless motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011115684.1A CN112224327A (en) | 2020-10-19 | 2020-10-19 | Middle-arranged driving device of electric power-assisted bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011115684.1A CN112224327A (en) | 2020-10-19 | 2020-10-19 | Middle-arranged driving device of electric power-assisted bicycle |
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| Publication Number | Publication Date |
|---|---|
| CN112224327A true CN112224327A (en) | 2021-01-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011115684.1A Pending CN112224327A (en) | 2020-10-19 | 2020-10-19 | Middle-arranged driving device of electric power-assisted bicycle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113803434A (en) * | 2021-09-29 | 2021-12-17 | 珠海格力节能环保制冷技术研究中心有限公司 | Harmonic speed reducer |
| CN114684318A (en) * | 2022-03-15 | 2022-07-01 | 苏州绿的谐波传动科技股份有限公司 | Central-positioned driving device and power-assisted bicycle |
-
2020
- 2020-10-19 CN CN202011115684.1A patent/CN112224327A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113803434A (en) * | 2021-09-29 | 2021-12-17 | 珠海格力节能环保制冷技术研究中心有限公司 | Harmonic speed reducer |
| CN114684318A (en) * | 2022-03-15 | 2022-07-01 | 苏州绿的谐波传动科技股份有限公司 | Central-positioned driving device and power-assisted bicycle |
| CN114684318B (en) * | 2022-03-15 | 2023-09-22 | 苏州绿的谐波传动科技股份有限公司 | Centrally-mounted driving device and power-assisted bicycle |
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