CN217730691U - Middle-mounted motor transmission system of power-assisted bicycle - Google Patents
Middle-mounted motor transmission system of power-assisted bicycle Download PDFInfo
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- CN217730691U CN217730691U CN202221491813.1U CN202221491813U CN217730691U CN 217730691 U CN217730691 U CN 217730691U CN 202221491813 U CN202221491813 U CN 202221491813U CN 217730691 U CN217730691 U CN 217730691U
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Abstract
The utility model discloses a middle motor transmission system of a power-assisted bicycle, which comprises a motor stator, a motor rotor, a five-way shaft and an output chain wheel, wherein the five-way shaft and the output chain wheel are coaxial with the motor rotor; a torque transmission sleeve and a cylindrical overrunning clutch seat are coaxially sleeved outside the five-way shaft respectively; the five-way shaft is connected with the torque transmission sleeve through a clutch structure. The five-way shaft is in transmission fit with one end of the torque transmission sleeve through the overrunning clutch A; two ends of the cylindrical overrunning clutch seat are respectively and synchronously connected with the torque transmission sleeve and the output chain wheel; the transmission system can perfectly adapt to three modes of pure electric, power assisting and pure manpower; compared with the existing transmission structure, the transmission system of the utility model is more compact, and the space utilization rate is greatly improved; meanwhile, the planetary gear train structure further enhances the reduction ratio of the planetary gear train, thereby effectively reducing the torque load of the motor and enabling the motor to output at high rotating speed.
Description
Technical Field
The utility model belongs to helping hand electric motor car motor field.
Background
The moped should not only have one boosting mode, but also have a pure electric mode and a pure manpower mode, and the five-way shaft can rotate along with the chain wheel when the existing transmission system is in the pure electric mode, so that certain potential safety hazards exist; meanwhile, the transmission system of the conventional power-assisted bicycle has the problems of not compact structure and overhigh torque load of a motor.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the not enough of existence among the prior art, the utility model provides a put motor drive system in moped can adapt to three kinds of modes of pure electronic, helping hand and pure manpower.
The technical scheme is as follows: in order to achieve the purpose, the middle motor transmission system of the power-assisted bicycle comprises a motor stator, a motor rotor, a five-way shaft and an output chain wheel, wherein the five-way shaft and the output chain wheel are coaxial with the motor rotor;
a torque transmission sleeve and a cylindrical overrunning clutch seat are coaxially sleeved outside the five-way shaft respectively; the five-way shaft is in transmission fit with one end of the torque transmission sleeve through the overrunning clutch A; two ends of the cylindrical overrunning clutch seat are respectively and synchronously connected with the torque transmission sleeve and the output chain wheel;
the double-planetary-gear-train synchronous motor also comprises a double-planetary-gear-train, wherein inner gear rings of the double-planetary-gear-train are fixed pieces, and sun gears of the double-planetary-gear-train are synchronous with a motor rotor; the planet support of the double-planet-gear train is coaxially matched with the cylindrical overrunning clutch seat in a transmission way through the overrunning clutch B.
Furthermore, two ends of the cylindrical overrunning clutch seat are coaxially and synchronously connected with the torque transmission sleeve and the output toothed disc through a first spline and a second spline respectively.
Furthermore, the double planet wheels comprise a large gear and a small gear which are coaxially integrated; the big gear is meshed with the sun gear, and the small gear is meshed with the inner gear ring.
Further, the frame of the bicycle comprises an outer shell fixed on the frame, the motor stator is fixed on the outer shell, and the cylindrical overrunning clutch seat is matched with the five-way shaft through a first bearing.
Furthermore, one end of the outer shell is connected with an end cover through a flange, and the inner gear ring is fixed on the end cover; and a bearing hole at the axle center of the end cover is matched with the outer ring of the cylindrical overrunning clutch seat through a second bearing.
Furthermore, the torque transmission device also comprises a sensor capable of detecting the torque and the rotating speed of the torque transmission sleeve.
Furthermore, the overrunning clutch A and the overrunning clutch B are ratchet clutch mechanisms or one-way bearings.
Has the advantages that: the transmission system can perfectly adapt to three modes of pure electric, power assisting and pure manpower; compared with the existing transmission structure, the transmission system of the utility model is more compact, and the space utilization rate is greatly improved; meanwhile, the double-planetary-gear-train structure further enhances the reduction ratio of the planetary gear train, so that the torque load of the motor is effectively reduced, and the motor can output at a high rotating speed.
Drawings
FIG. 1 is a schematic diagram of the transmission system of the device.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The middle motor transmission system of the moped shown in the attached drawing 1 comprises a motor stator 2, a motor rotor 1, a five-way shaft 7 and an output chain wheel 14, wherein the five-way shaft and the motor rotor 1 are coaxial; wherein, two ends of the five-way shaft 7 are used for pedaling a crank for manual pedal driving; the output chain wheel 14 is connected with the rear wheel of the bicycle through chain transmission;
the five-way shaft 7 is respectively coaxially sleeved with a torque transmission sleeve 3 and a cylindrical overrunning clutch seat 10; the five-way shaft 7 is in transmission fit with one end of the torque transmission sleeve 3 through the overrunning clutch 4A, the device further comprises a sensor capable of detecting the torque and the rotating speed of the torque transmission sleeve 3, wherein the sensor for detecting the rotating speed is a Hall rotating speed sensor, and the sensor for detecting the torque is a resistance strain gauge type torque sensor; two ends of the cylindrical overrunning clutch seat 10 are coaxially and synchronously connected with the torque transmission sleeve 3 and the output chain wheel 14 through a first spline and a second spline respectively; the double-planetary gear train is composed of a sun gear 11, a double-planetary gear 17, an inner gear ring 16 and a planet carrier 13, the double-planetary gear 17 of the embodiment includes a large gear 17.1 and a small gear 17.2 which are coaxially integrated, the large gear 17.1 is engaged with the sun gear 11, the small gear 17.2 is engaged with the inner gear ring 16, and what needs to be explained is that: the large gear 17.1 and the small gear 17.2 are a relative concept, the number of teeth of the large gear 17.1 is larger than that of the small gear 17.2, and the purpose is to further enhance the reduction ratio of the planetary gear train, so that the torque load of the motor is effectively reduced, and the motor can be output at a high rotating speed; the double planetary gear train is a classical transmission structure, the scheme is to amplify the torque of the motor by utilizing the torque amplification characteristic of the planetary gear train structure, and the specific structure is as follows: the inner gear ring 16 is a fixed part and is coaxial with the five-way shaft 7, and the sun gear 11 is synchronous with the motor rotor 1; the planet carrier 13 is coaxially matched with the cylindrical overrunning clutch seat 10 in a transmission way through the B overrunning clutch 12; the overrunning clutch A4 and the overrunning clutch B12 of the embodiment are ratchet clutch mechanisms or one-way bearings;
the transmission principle is as follows:
1. pure electric mode: in an electric power mode, manpower does not apply torque to the five-way shaft 7, at the moment, the torque output by the motor rotor 1 directly drives the sun gear 11 to rotate, then the planet gear system transmits and amplifies the torque to enable the planet support 13 to rotate, the planet support 13 transmits the amplified torque to the cylindrical overrunning clutch seat 10 through the B overrunning clutch 12, and finally the output chain wheel 14 is driven, so that the bicycle is directly driven to run, and the five-way shaft 7 cannot rotate because the A overrunning clutch 4 is in a disengaged state, so that potential safety hazards do not exist;
2. pure manpower mode: the five-way shaft 7 is applied with torque by manpower, the five-way shaft 7 transmits the torque from the manpower to the torque transmission sleeve 3 through the A overrunning clutch 4, the torque transmission sleeve 3 transmits the torque to the cylindrical overrunning clutch seat 10, and finally the output chain wheel 14 is driven, so that the bicycle is directly driven to run; the overrunning B clutch 12 is in a disengaged state because the motor rotor 1 does not output torque;
3. a power-assisted mode: the manpower applies torque to the five-way shaft 7, the five-way shaft 7 transmits the torque from the manpower to the torque transmission sleeve 3 through the A overrunning clutch 4, and the torque transmission sleeve 3 transmits the torque to the cylindrical overrunning clutch seat 10; meanwhile, the torque sensor senses that torque exists on the torque transmission sleeve 3 and then sends a signal to the controller, then the controller drives the motor rotor 1 to output the torque, so that the sun gear 11 is driven to rotate, then the torque is transmitted through the planetary gear train and amplified, the planetary support 13 rotates, and the amplified torque is transmitted to the cylindrical overrunning clutch base 10 through the overrunning clutch B12 by the planetary support 13; finally, the cylindrical overrunning clutch seat 10 transmits the torques from the manpower part and the motor part to the output chain wheel 14 together, thereby driving the bicycle to run and playing the effect of boosting.
The motor stator 2 is fixed on the outer shell 18, and the cylindrical overrunning clutch seat 10 is matched with the five-way shaft 7 through the first bearing 9; one end of the outer shell 18 is connected with an end cover 15 in a flange mode, and the inner gear ring 16 is fixed on the end cover 15; and the bearing hole at the axle center of the end cover 15 is matched with the outer ring of the cylindrical overrunning clutch seat 10 through the second bearing 50, so that the structure of a transmission system is more compact, and the space utilization rate is greatly improved.
The above is only a preferred embodiment of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention, and are intended to be within the scope of the invention.
Claims (7)
1. The middle motor transmission system of the power-assisted bicycle is characterized in that: the motor comprises a motor stator (2), a motor rotor (1), a five-way shaft (7) which is coaxial with the motor rotor (1) and an output chain wheel (14);
the five-way shaft (7) is respectively sleeved with a torque transmission sleeve (3) and a cylindrical overrunning clutch seat (10) coaxially; the five-way shaft (7) is in transmission fit with one end of the torque transmission sleeve (3) through the overrunning clutch A (4); two ends of the cylindrical overrunning clutch seat (10) are respectively and synchronously connected with the torque transmission sleeve (3) and the output chain wheel (14);
the planetary gear train comprises a motor rotor (1), a double planetary gear train, a planetary gear train and a planetary gear train, wherein an inner gear ring (16) of the double planetary gear train is a fixed piece, and a sun gear (11) of the double planetary gear train is synchronous with the motor rotor; the planet carrier (13) of the double-planet gear train is coaxially matched with the cylindrical overrunning clutch seat (10) in a transmission way through the B overrunning clutch (12).
2. The center-mounted motor drive system of a power-assisted bicycle according to claim 1, wherein: and two ends of the cylindrical overrunning clutch seat (10) are coaxially and synchronously connected with the torque transmission sleeve (3) and the output chain wheel (14) through a first spline and a second spline respectively.
3. The center-mounted motor drive system of a power-assisted bicycle according to claim 1, wherein: the double planet wheels (17) of the double-planet-wheel train comprise a large gear (17.1) and a small gear (17.2) which are coaxially integrated; the gearwheel (17.1) engages the sun wheel (11), and the pinion (17.2) engages the inner gear ring (16).
4. The center-mounted motor drive system of a power-assisted bicycle according to claim 2, wherein: the motor stator is characterized by further comprising an outer shell (18) fixed on the frame, the motor stator (2) is fixed on the outer shell (18), and the cylindrical overrunning clutch seat (10) is matched with the five-way shaft (7) through a first bearing (9).
5. The center-mounted motor transmission system of a power-assisted bicycle according to claim 4, wherein: one end of the outer shell (18) is connected with an end cover (15) in a flange mode, and the inner gear ring (16) is fixed on the end cover (15); and a bearing hole at the axle center of the end cover (15) is matched with the outer ring of the cylindrical overrunning clutch seat (10) through a second bearing (50).
6. The center-mounted motor drive system of a power-assisted bicycle according to claim 1, wherein: the torque transmission device also comprises a sensor capable of detecting the torque and the rotating speed of the torque transmission sleeve (3).
7. The center-mounted motor drive system of a power-assisted bicycle according to claim 1, wherein: the overrunning clutch A (4) and the overrunning clutch B (12) are ratchet clutch mechanisms or one-way bearings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221491813.1U CN217730691U (en) | 2022-06-15 | 2022-06-15 | Middle-mounted motor transmission system of power-assisted bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221491813.1U CN217730691U (en) | 2022-06-15 | 2022-06-15 | Middle-mounted motor transmission system of power-assisted bicycle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217730691U true CN217730691U (en) | 2022-11-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221491813.1U Active CN217730691U (en) | 2022-06-15 | 2022-06-15 | Middle-mounted motor transmission system of power-assisted bicycle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217730691U (en) |
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2022
- 2022-06-15 CN CN202221491813.1U patent/CN217730691U/en active Active
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