CN109625146B - Compact central motor adopting primary gear reduction transmission - Google Patents
Compact central motor adopting primary gear reduction transmission Download PDFInfo
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- CN109625146B CN109625146B CN201910027143.4A CN201910027143A CN109625146B CN 109625146 B CN109625146 B CN 109625146B CN 201910027143 A CN201910027143 A CN 201910027143A CN 109625146 B CN109625146 B CN 109625146B
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- 230000009467 reduction Effects 0.000 title claims abstract description 47
- 230000005540 biological transmission Effects 0.000 title claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims abstract description 42
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000004677 Nylon Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 19
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000012958 reprocessing Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 2
- 244000309464 bull Species 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
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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
- B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
- B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
-
- 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
- B62M23/00—Transmissions characterised by use of other elements; Other transmissions
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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
- B62M7/00—Motorcycles characterised by position of motor or engine
- B62M7/02—Motorcycles characterised by position of motor or engine with engine between front and rear wheels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention discloses a compact central motor adopting primary gear reduction transmission, which comprises a shell, a motor body, a clutch, a gear reduction mechanism, a central shaft and a tooth disc, wherein the motor body comprises a stator, a rotor and a central shaft thereof, the central shaft penetrates through shaft holes at two ends of the shell and is supported and positioned through central shaft bearings arranged in the shell, and the central shaft is arranged in parallel with the central shaft; the gear speed reducing mechanism comprises a pinion fixed or integrally arranged on a mandrel and a large gear meshed with the pinion, wherein the large gear inner ring is fixed or integrally formed with a clutch outer ring, the clutch inner ring is arranged on a central shaft through a clutch bearing, and the front end of the clutch inner ring is integrally formed with a tooth disc positioning sleeve extending out of a shaft hole of the housing so as to fix a tooth disc. The motor is more compact in structure, smaller in size and fewer in parts, is particularly suitable for electric bicycles with smaller motor design power, and can greatly save production cost.
Description
Technical Field
The invention relates to a compact central motor with gear reduction.
Background
The middle motor is a power core component of the electric bicycle, and the development of the middle motor in the industry at present has the main trend of compact structure, small volume and large output torque.
Existing mid-motor is generally a parallel-expanded structure, which is composed of a housing, a motor body, a gear reduction mechanism, a clutch, a central shaft and a toothed disc. The mandrel of the motor body is connected with a tooth disc sleeved on the center shaft or a positioning component thereof through a gear reduction mechanism. The gear reduction mechanism mainly adopts multi-stage gear transmission to replace the planetary gear reduction mechanism with relatively complex structure and more parts. The clutch is usually installed between a certain intermediate gear of the gear reduction mechanism and its transmission shaft, and when the bicycle is slippery, the clutch can cut off the transmission association between the toothed disc and the spindle of the motor body, eliminating interference. In addition, a torsion sensor is arranged on the middle shaft and used for converting the pedaling force of the foot when a person rides into corresponding voltage signals and outputting the corresponding voltage signals to the controller so as to control the running power of the motor. Meanwhile, a unidirectional ratchet mechanism is often designed between the middle shaft and the gear of the gear reduction mechanism, and the mechanism has the function of ensuring that the pedal force of a person can be transmitted to the gear reduction mechanism through the middle shaft to drive the tooth disc to operate when the motor does not operate or the rotating speed is not high, and cutting off the transmission association of the middle shaft and the gear reduction mechanism after the rotating speed of the motor is increased, so that the interference caused by pedal of the person is prevented.
Most of the centrally-mounted motors adopted in the market at present have the above structures, and although the structures of the centrally-mounted motors have various advantages compared with the traditional centrally-mounted motors, the following defects are still found:
1) For a part of electric bicycles with smaller motor design power, a higher reduction ratio is not needed actually, but manufacturers do not have alternative middle motors which can only adopt the multi-stage gear transmission at present, as is well known, besides a plurality of transmission parts such as an intermediate gear and a transmission shaft thereof, a motor shell part is often designed to be used as a mounting bracket of the intermediate gear for a motor middle cover positioned between a motor rear cover and a motor front cover, so that the production cost is often higher, and the waste of production resources is definitely caused.
2) The existing multi-stage gear transmission middle motor is applied to the electric bicycle with a low-power motor, and the radial size of the motor cannot be further effectively reduced and optimized because the internal multi-stage gear reduction mechanism occupies a large space, so that the whole structure and the whole size of the motor are still not compact enough, and inconvenience is brought to the installation and positioning of the motor on a frame.
3) In the traditional centrally-mounted motor, the motor body is often arranged into the structure form of an inner rotor outer stator due to the consideration of increasing the reduction ratio, and the disadvantage is that the motor output torque is small. For electric bicycles with smaller motor design power, there is no high requirement for the reduction ratio, but a large motor output torque is still required, and it is obvious that the current middle motor cannot meet the requirement.
4) For the existing unidirectional ratchet mechanism, the user reacts, and in the actual riding process of the bicycle, the time from pedaling the middle shaft to obtaining force feedback (namely, the pawl is meshed with the ratchet to enable the middle shaft to establish transmission with the gear of the gear reduction mechanism) is slightly longer, which is mainly attributed to the fact that the equal number of ratchet teeth of the inner ring of the ratchet sleeve is too small, and the ratchet gap angle is too large. The existing solution is to reprocess the ratchet sleeve to increase the number of ratchet teeth, but in this way, on one hand, the processing difficulty is high, on the other hand, the mold needs to be opened again, the existing ratchet sleeve is scrapped, and the waste is high for enterprises.
Disclosure of Invention
The invention aims at: the compact middle motor adopting the primary gear reduction transmission is more compact in structure, smaller in size, fewer in parts and convenient to produce, is particularly suitable for electric bicycles with smaller motor design power, and can greatly save production cost.
The technical scheme of the invention is as follows: the compact central motor adopting the primary gear reduction transmission comprises a shell, a motor body, a clutch, a gear reduction mechanism, a central shaft and a tooth disc, wherein the motor body comprises a stator, a rotor and a central shaft fixed with the rotor, the central shaft penetrates through shaft holes at two ends of the shell and is supported and positioned through central shaft bearings arranged in the shell, and the central shaft is arranged in parallel with the central shaft; the gear speed reducing mechanism is a primary gear speed reducing mechanism, and comprises a pinion fixed on or integrally arranged on a mandrel and a large gear meshed with the pinion, wherein the inner ring of the large gear is fixed on or integrally formed with the outer ring of a clutch, the inner ring of the clutch is arranged on a central shaft through a clutch bearing, and the front end of the inner ring of the clutch is integrally formed with a tooth disc positioning sleeve extending out of a shaft hole of the housing so as to fix a tooth disc.
Further, a core chamber for positioning the motor body, a speed reduction chamber for accommodating a gear speed reduction mechanism and a middle shaft chamber below the speed reduction chamber are arranged in the shell; the motor front cover and the motor rear cover are respectively provided with the shaft holes; and the motor front cover and the motor rear cover are respectively provided with a machine core cavity bearing seat for installing a mandrel bearing to support and position the mandrel, and meanwhile, the motor rear cover and the inner ring of the dental tray positioning sleeve are respectively provided with a center shaft cavity bearing seat for installing the center shaft bearing to support and position the center shaft, and a dental tray positioning sleeve bearing is also installed between the outer ring of the dental tray positioning sleeve and the motor front cover.
Furthermore, in the invention, an annular stator support is fixed on a bearing seat of a core cavity on the motor rear cover, the stator is fixed on the annular stator support, and the mandrel passes through the middle of the annular stator support.
Further, the rotor comprises a rotor flywheel cover fixed on the mandrel and magnetic steel fixed on the inner ring of the rotor flywheel cover and opposite to the stator, the fixed position of the rotor flywheel cover on the mandrel is located between the stator and the pinion, and the cover opening of the rotor flywheel cover is arranged back to the pinion. After the design is adopted, the rotor flywheel cover is closer to the output end of the mandrel (namely, one end provided with the pinion), and compared with the traditional design that the rotor flywheel cover faces the direction of the pinion and is far away from the output end of the mandrel, the torque applied by the rotor flywheel cover on the output end of the mandrel is more concentrated and more direct, the energy loss is smaller, and the torque is further increased.
Furthermore, the invention also comprises a sensor sleeve fixed on the center shaft and a torsion sensor arranged on the sensor sleeve, meanwhile, a one-way ratchet mechanism is arranged between the inner ring of the clutch and the center shaft, the mechanism comprises a ratchet sleeve with ratchet teeth equally divided by the inner ring and a pawl positioning ring fixed on the sensor sleeve and positioned in the ratchet sleeve, a plurality of pawls matched with the ratchet teeth are arranged on the pawl positioning ring, and the periphery of the ratchet sleeve is fixed with the inner ring of the clutch. The working principle of the torsion sensor is as per the conventional technology, and the invention does not improve the working principle.
Furthermore, two identical groups of pawls are alternately arranged on the pawl positioning ring, each group of pawls is composed of more than two pawls which are arranged at equal angle intervals along the circumference of the pawl positioning ring, one group of pawls is a main pawl, the other group of pawls is a secondary pawl, the interval angle between the adjacent main pawl and secondary pawl on the circumference of the pawl positioning ring is b, b is not equal to n multiplied by a, a is a single ratchet angle degree of the inner ring of the ratchet sleeve, the angle is equal to the interval angle between the adjacent two ratchet teeth, and n is a positive integer. The design can obviously shorten the time from pedaling the middle shaft to obtaining force feedback (namely, the pawl is meshed with the ratchet to enable the middle shaft to establish transmission with the gear of the gear reduction mechanism) in the actual riding process of the bicycle, and greatly improve the user experience. And a group of pawls are added, so that the operation is easier than that of reprocessing the inner ring ratchet teeth of the ratchet sleeve, the scrapping of the original ratchet sleeve is avoided, the production resources of enterprises can be effectively saved, and the production cost is reduced.
Furthermore, in the invention, the center of the dental disc is provided with a circular center hole, the circular center hole is sleeved on the dental disc positioning sleeve, a plurality of semicircular convex keys are uniformly arranged at intervals on the inner periphery of the circular center hole in a protruding mode, the periphery of the dental disc positioning sleeve is matched with the circular center hole of the dental disc, semicircular grooves for embedding the semicircular convex keys are correspondingly formed in the dental disc positioning sleeve, and meanwhile threads are further arranged on the periphery of the dental disc positioning sleeve and are used for being matched with locking nuts to lock the dental disc on the shell. The original tooth disc and tooth disc positioning sleeve are matched and positioned by Fang Jian and square grooves, and the tooth disc is unevenly stressed. And the square groove is arranged on the tooth disc positioning sleeve, which is not beneficial to processing external threads, and the locking and positioning of the tooth disc are unreliable. The invention adopts the matching of the semicircular convex key and the semicircular groove to ensure the balance of the stress of the dental tray and improve the force transmission effect between the middle shaft and the dental tray. And the design of a plurality of semicircular grooves which are distributed along the circumference and are arranged at equal angle intervals is beneficial to the processing of external threads.
Further, in the invention, the large gear is a nylon gear, and the small gear is a metal gear. The design can ensure the transmission strength on the one hand, and can reduce the gear engagement vibration and the noise on the other hand.
Further, the clutch in the invention is a one-way needle roller clutch.
The working principle of the invention is as follows: in the riding process, when the rotating speed of the pedal center shaft of the person is higher than the rotating speed output by the motor body, the inner ring and the outer ring of the clutch are disconnected at the moment, and the pawl of the one-way ratchet mechanism is meshed with the ratchet, so that the pedal force of the person can be transmitted to the gear reduction mechanism and the inner ring of the clutch through the center shaft, and then the tooth disc positioning sleeve and the tooth disc are driven to operate. Because the inner ring and the outer ring of the clutch are separated, the rotation torque of the middle shaft does not interfere with the motor body, and the working process is applicable to the condition that the motor body is decelerated and the condition that the motor body stops working (namely, a sliding state); when the rotation speed of the human pedal center shaft is smaller than the rotation speed output by the motor body (at the moment, the motor body runs at a high speed), the inner and outer rings of the clutch are clenched, the pawl and the ratchet of the one-way ratchet mechanism are separated, the center shaft of the motor body is completely driven to rotate around the center shaft by the gear reduction mechanism (primary gear reduction transmission) meshed with the large gear and the small gear, so that the tooth disc positioning sleeve can drive the tooth disc to rotate and output power, and the operation of the motor body does not interfere the center shaft due to the separation relation of the pawl and the ratchet.
The invention has the advantages that:
1. compared with the existing widely adopted centrally-mounted motor, the gear reduction mechanism of the invention only adopts primary gear reduction transmission with meshed large and small gears, wherein the large gear is supported and positioned by a central shaft, and a plurality of parts such as a motor middle cover and a gear shaft which originally support and position a middle gear are eliminated, so that the volume of a shell is further reduced, the motor is more compact, parts are fewer, the assembly is convenient, the production is convenient, and the torque is increased by combining the motor body configuration of an outer rotor inner stator, so that the invention is particularly suitable for replacing the existing centrally-mounted motor with an electric bicycle with smaller motor design power, and can greatly save the production cost.
2. In the design of the internal structure of the shell, the tooth disc positioning sleeve adopts the inner center shaft bearing and the outer tooth disc positioning sleeve bearing to pack and clamp positioning support, and meanwhile, the tooth disc positioning sleeve is integrally formed on the clutch inner ring, and the clutch inner ring is supported through the clutch bearing, so that the support positioning of the clutch and the upper gear thereof is stable and reliable, and the transmission stability of the gear reduction mechanism can be greatly improved. The clutch bearing is used for supporting and positioning the middle shaft at the same time, and the middle shaft bearing on one side is also used for supporting and positioning the dental tray positioning sleeve at the same time, so that the functional characteristics of the parts are fully exerted, the parts are saved, the internal space of the shell is further optimized and reduced, and the whole motor is more compact.
3. Compared with the traditional design that the rotor flywheel cover faces the direction of the pinion and is far away from the output end of the mandrel, the torque applied by the rotor flywheel cover on the output end of the mandrel is more concentrated, more direct and less in energy loss, and is beneficial to further increasing the torque.
4. The pawl positioning ring is provided with the same main pawl and the same auxiliary pawl in a staggered manner, each pawl is composed of more than two pawls which are arranged at equal angle intervals along the circumference, the interval angle between the main pawl and the auxiliary pawl which are adjacent on the circumference is b, b is not equal to n multiplied by a, wherein a is a single ratchet angle degree of the inner ring of the ratchet sleeve in an equal manner, and n is a positive integer. The design can obviously shorten the time from pedaling the middle shaft to obtaining force feedback (namely, the pawl is meshed with the ratchet to enable the middle shaft to establish transmission with the gear of the gear reduction mechanism) in the actual riding process of the bicycle, and greatly improve the user experience. And a group of pawls are added, so that the operation is easier than that of reprocessing the inner ring ratchet teeth of the ratchet sleeve, the scrapping of the original ratchet sleeve is avoided, the production resources of enterprises can be effectively saved, and the production cost is reduced.
5. According to the tooth disc and tooth disc positioning sleeve disclosed by the invention, the semicircular convex keys and the semicircular grooves are matched, so that the balance of the stress of the tooth disc can be ensured, and the force transmission effect between the center shaft and the tooth disc is improved. And the design of a plurality of semicircular grooves which are distributed along the circumference and are arranged at equal angle intervals is beneficial to the processing of external threads.
Drawings
The invention is further described below with reference to the accompanying drawings and examples:
FIG. 1 is a main sectional view of an embodiment of the present invention;
FIG. 2 is a front view of the one-way ratchet mechanism of the embodiment of FIG. 1;
fig. 3 is a front view of the dental tray of the embodiment of fig. 1.
Wherein: 1. a clutch; 1a, an outer ring; 1b, an inner ring; 2. a center shaft; 3. a dental tray; 3a, a circular central hole; 4. a stator; 5. a rotor; 5a, rotor flywheel cover; 5b, magnetic steel; 6. a mandrel; 7. a center shaft bearing; 8. a motor front cover; 9. a motor rear cover; 10. a pinion gear; 11. a large gear; 12. a clutch bearing; 13. a tooth disc positioning sleeve; 14. a mandrel bearing; 15. a tooth disc positioning sleeve bearing; 16. an annular stator support; 17. a sensor sleeve; 18. a torsion sensor; 19. a ratchet; 20. a ratchet sleeve; 21. a pawl positioning ring; 22. a pawl; 22a, a main pawl; 22b, auxiliary pawls; 23. a semicircular convex key; 24. a lock nut; A. a movement chamber; B. a deceleration chamber; C. a bottom bracket cavity.
Detailed Description
Examples: the following describes a specific embodiment of the compact center motor adopting one-stage gear reduction transmission according to the present invention with reference to fig. 1 to 3 as follows:
as shown in fig. 1, it has a housing, a motor body, a clutch 1, a gear reduction mechanism, a center shaft 2, a dental tray 3, a sensor housing 17, a torsion sensor 18, and a one-way ratchet mechanism as in the conventional art. The motor body comprises a stator 4, a rotor 5 and a mandrel 6 fixed with the rotor 5, wherein the central shaft 2 passes through shaft holes at two ends of the shell and is supported and positioned through a central shaft bearing 7 arranged in the shell, and the mandrel 6 is arranged in parallel with the central shaft 2. The invention has the core improvement that:
the shell of the invention cancels the design of a motor middle cover, is directly formed by buckling and fixing a motor front cover 8 and a motor rear cover 9, and is internally provided with a core chamber A for positioning the motor body, a speed reduction chamber B for accommodating a gear speed reduction mechanism in front of the core chamber A and a middle shaft chamber C below the speed reduction chamber B for penetrating the middle shaft 2; the motor body adopts an outer rotor 5 inner stator 4 structure, and a motor front cover 8 and a motor rear cover 9 are both provided with a core cavity bearing seat for installing a core shaft bearing 14 so as to support and position the core shaft 6.
As shown in fig. 1, the gear reduction mechanism of the present invention is a primary gear reduction mechanism, and is composed of a pinion 10 integrally provided on a spindle 6, a large gear 11 engaged with the pinion 10, and a clutch 1, wherein the clutch 1 is a one-way needle clutch. In this embodiment, the inner ring of the large gear 11 is integrally formed with the outer ring 1a of the clutch 1, the inner ring 1b of the clutch 1 is mounted on the central shaft 2 through the clutch bearing 12, and the front end of the inner ring 1b of the clutch is integrally formed with a tooth disc positioning sleeve 13 extending out of the shaft hole of the housing to fix the tooth disc 3. The motor front cover 8 and the motor rear cover 9 are respectively provided with the shaft holes, and particularly as shown in fig. 1, the motor rear cover 9 and the inner ring of the dental disc positioning sleeve 13 are respectively provided with a central shaft chamber bearing seat for installing the central shaft bearing 7 so as to support and position the central shaft 2, and a dental disc positioning sleeve bearing 15 is also installed between the outer ring of the dental disc positioning sleeve 13 and the motor front cover 8.
In this embodiment, an annular stator support 16 is fixed on a bearing seat of a movement cavity on the motor rear cover 9, the stator 4 is fixed on the annular stator support 16, and the mandrel 6 passes through the middle of the annular stator support 16. The rotor 5 is composed of a rotor flywheel cover 5a fixed on the mandrel 6 and magnetic steel 5b fixed on the inner ring of the rotor flywheel cover 5a and opposite to the stator 4, the fixed position of the rotor flywheel cover 5a on the mandrel 6 is located between the stator 4 and the pinion 10, and the cover opening of the rotor flywheel cover 5a is arranged opposite to the pinion 10, as shown in fig. 1. The rotor flywheel housing 5a in this embodiment is closer to the output end of the spindle 6 (i.e. the end where the pinion 10 is disposed), and the torque applied by the rotor flywheel housing 5a to the output end of the spindle 6 is more concentrated, more direct, and less energy loss, and is advantageous for further increasing the torque, as compared to the conventional design in which the rotor flywheel housing 5a faces the direction of the pinion 10 and is away from the output end of the spindle 6.
As shown in fig. 1, a sensor sleeve 17 and a torsion sensor 18 arranged on the sensor sleeve 17 are fixed on the center shaft 2, and meanwhile, a one-way ratchet mechanism is arranged between the inner ring of the clutch 1 and the center shaft 2, and comprises a ratchet sleeve 20 with ratchet teeth 19 equally divided by the inner ring and a pawl positioning ring 21 fixed on the sensor sleeve 17 and positioned in the ratchet sleeve 20, wherein a plurality of pawls 22 matched with the ratchet teeth 19 are arranged on the pawl positioning ring 21, and the periphery of the ratchet sleeve 20 is fixed with the inner ring of the clutch 1.
As further shown in fig. 2, the pawl positioning ring 21 is provided with two identical groups of pawls in a staggered manner, each group of pawls is composed of three pawls 22 arranged at equal angular intervals along the circumference of the pawl positioning ring 21, wherein one group of pawls is a primary pawl 22a and the other group is a secondary pawl 22b. The spacing angle between adjacent primary and secondary pawls 22a, 22b on the circumference of the pawl positioning ring 21 is b, b being unequal to n x a, where a is the number of degrees of a single ratchet tooth 19 (i.e., the spacing angle between adjacent two ratchet teeth 19) equally divided by the inner circumference of the ratchet sleeve 20, and n is a positive integer.
In this embodiment, the total number of ratchet teeth is 30, the angle a of each ratchet tooth 19 after halving is 12 °, and the degree of b in fig. 2 is 68 °, which is not equal to a positive integer multiple of a. In practice, of course, because the two sets of pawls are staggered and offset, there are two circumferentially adjacent primary and secondary pawls 22a, 22b that are spaced apart by different degrees, only one of which is shown in fig. 2, but neither of which is a positive integer multiple of the ratchet angle. This design ensures that when one of the primary and secondary pawls 22a, 22b engages the ratchet teeth 19, the other is still disengaged from the ratchet teeth 19 a distance, thereby increasing the frequency of engagement of the pawls 22 with the ratchet teeth 19, ultimately to significantly reduce the time to pedal the bottom bracket until force feedback is achieved (i.e., engagement of the pawls 22 with the ratchet teeth 19 causes the bottom bracket 2 to establish a drive with the bull gear 11) during actual riding of the bicycle, and greatly enhance the user experience. And a group of pawls 22 is added, so that the operation is easier than the reprocessing of the inner ring ratchet 19 of the ratchet sleeve 20, the scrapping of the original ratchet sleeve 20 is avoided, the production resources of enterprises can be effectively saved, and the production cost is reduced.
Referring to fig. 3, in this embodiment, a circular center hole 3a is provided in the center of the dental disc 3 and is sleeved on the dental disc positioning sleeve 13 through the circular center hole 3a, 8 semicircular convex keys 23 are uniformly provided on the inner periphery of the circular center hole 3a at intervals, the periphery of the dental disc positioning sleeve 13 is matched with the circular center hole 3a of the dental disc 3, semicircular grooves in which the semicircular convex keys 23 are embedded are correspondingly provided, and simultaneously, threads are provided on the periphery of the dental disc positioning sleeve 13 to cooperate with locking nuts 24 to lock the dental disc 3 on the housing, as shown in fig. 1. According to the invention, the semicircular convex key 23 and the semicircular groove are matched, so that the balance of the stress of the dental tray 3 can be ensured, and the force transmission effect between the center shaft 2 and the dental tray 3 is improved. And the design of a plurality of semicircular grooves which are distributed along the circumference and are arranged at equal angles at intervals is beneficial to the processing of external threads.
The large gear 11 is a nylon gear in this embodiment, and the small gear 10 is a metal gear. The design can ensure the transmission strength on one hand and reduce the meshing vibration of the gear 10 and the noise on the other hand.
The above embodiments are merely for illustrating the technical concept and features of the present invention, and are not intended to limit the scope of the present invention to those skilled in the art to understand the present invention and implement the same. All modifications made according to the spirit of the main technical proposal of the invention should be covered in the protection scope of the invention.
Claims (4)
1. The utility model provides an adopt compact centrally-mounted motor of one-level gear reduction transmission, including shell, motor body, clutch (1), gear reduction mechanism, axis (2) and tooth dish (3), motor body includes stator (4), rotor (5) and dabber (6) fixed with rotor (5), axis (2) pass the shaft hole at shell both ends and through locating in the shell axis bearing (7) support location, dabber (6) and axis (2) parallel arrangement; the gear speed reducing mechanism is a primary gear speed reducing mechanism and comprises a pinion (10) fixedly or integrally arranged on a mandrel (6) and a large gear (11) meshed with the pinion (10), wherein the inner ring of the large gear (11) is fixedly or integrally formed with the outer ring (1 a) of a clutch (1), the inner ring (1 b) of the clutch (1) is arranged on a central shaft (2) through a clutch bearing (12), and the front end of the inner ring (1 b) of the clutch (1) is integrally formed with a tooth disc positioning sleeve (13) extending out of a shaft hole of the housing so as to fix a tooth disc (3);
the motor is characterized in that a core chamber (A) for positioning the motor body, a speed reduction chamber (B) for accommodating a gear speed reduction mechanism and a middle shaft chamber (C) below the speed reduction chamber (B) for penetrating the middle shaft (2) are arranged in the shell; the motor front cover (8) and the motor rear cover (9) are respectively provided with the shaft holes; the motor front cover (8) and the motor rear cover (9) are respectively provided with a core cavity bearing seat for installing a mandrel bearing (14) to support and position the mandrel (6), meanwhile, the motor rear cover (9) and the inner ring of the dental disc positioning sleeve (13) are respectively provided with a middle shaft cavity bearing seat for installing the middle shaft bearing (7) to support and position the middle shaft (2), and a dental disc positioning sleeve bearing (15) is also arranged between the outer ring of the dental disc positioning sleeve (13) and the motor front cover (8);
the rotor (5) comprises a rotor flywheel cover (5 a) fixed on the mandrel (6) and magnetic steel (5 b) fixed on the inner ring of the rotor flywheel cover (5 a) and opposite to the stator (4), the fixed position of the rotor flywheel cover (5 a) on the mandrel (6) is positioned between the stator (4) and the pinion (10), and the cover opening of the rotor flywheel cover (5 a) is arranged opposite to the pinion (10);
the clutch is characterized by further comprising a sensor sleeve (17) fixed on the center shaft (2) and a torsion sensor (18) arranged on the sensor sleeve (17), wherein a one-way ratchet mechanism is arranged between the inner ring of the clutch (1) and the center shaft (2), the one-way ratchet mechanism comprises a ratchet sleeve (20) with ratchet teeth (19) at equal intervals on the inner ring and a pawl positioning ring (21) fixed on the sensor sleeve (17) and positioned in the ratchet sleeve (20), a plurality of pawls (22) matched with the ratchet teeth (19) are arranged on the pawl positioning ring (21), and the periphery of the ratchet sleeve (20) is fixed with the inner ring of the clutch (1);
the pawl positioning ring (21) is provided with two identical groups of pawls in a staggered manner, each group of pawls is composed of more than two pawls (22) which are arranged at equal angle intervals along the circumference of the pawl positioning ring (21), wherein one group of pawls is a main pawl (22 a) and the other group of pawls is a secondary pawl (22 b), the interval angle between the adjacent main pawl (22 a) and secondary pawl (22 b) on the circumference of the pawl positioning ring (21) is b, b is not equal to n x a, a is the angle degree of a single ratchet (19) which is equal to the inner ring of the ratchet sleeve (20), and n is a positive integer;
the tooth dish (3) center is equipped with circular centre bore (3 a) to establish on tooth dish positioning sleeve (13) through this circular centre bore (3 a) cover, circular centre bore (3 a) inner circumference evenly interval is protruding to be equipped with a plurality of semicircle protruding keys (23), and tooth dish positioning sleeve (13) periphery and tooth dish (3) circular centre bore (3 a) match, and be equipped with the semicircle recess that supplies semicircle protruding key (23) to imbed on it correspondingly, tooth dish positioning sleeve (13) periphery still is equipped with the screw thread simultaneously and is used for cooperating lock nut (24) in order to lock tooth dish (3) on the shell.
2. The compact central motor adopting the primary gear reduction transmission according to claim 1 is characterized in that an annular stator support (16) is fixed on a core chamber bearing seat on a motor rear cover (9), the stator (4) is fixed on the annular stator support (16), and a mandrel (6) passes through the middle of the annular stator support (16).
3. The compact centrally-mounted electric motor employing primary gear reduction transmission according to claim 1, characterized in that the large gear (11) is a nylon gear and the small gear (10) is a metal gear.
4. The compact centrally-mounted electric motor employing primary gear reduction transmission of claim 1, wherein the clutch (1) is a one-way needle clutch.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910027143.4A CN109625146B (en) | 2019-01-11 | 2019-01-11 | Compact central motor adopting primary gear reduction transmission |
| PCT/CN2019/120530 WO2020143340A1 (en) | 2019-01-11 | 2019-11-25 | Compact mid-drive motor using single-stage gear reduction drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910027143.4A CN109625146B (en) | 2019-01-11 | 2019-01-11 | Compact central motor adopting primary gear reduction transmission |
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| CN109625146A CN109625146A (en) | 2019-04-16 |
| CN109625146B true CN109625146B (en) | 2024-03-15 |
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| CN201910027143.4A Active CN109625146B (en) | 2019-01-11 | 2019-01-11 | Compact central motor adopting primary gear reduction transmission |
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| CN (1) | CN109625146B (en) |
| WO (1) | WO2020143340A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109625146B (en) * | 2019-01-11 | 2024-03-15 | 苏州盛亿电机有限公司 | Compact central motor adopting primary gear reduction transmission |
| CN110525572A (en) * | 2019-06-21 | 2019-12-03 | 卧龙电气驱动集团股份有限公司 | A kind of secondary transmission vehicle using motor built-in motor |
| CN111516795A (en) * | 2020-04-30 | 2020-08-11 | 常州洪记两轮智能交通工具有限公司 | Middle motor for electric power-assisted vehicle |
| CN111478515A (en) * | 2020-05-07 | 2020-07-31 | 无锡川克智能电机有限公司 | Outer rotor type middle-placed motor for electric power-assisted vehicle |
| CN113715952A (en) * | 2021-08-23 | 2021-11-30 | 爱克玛电驱动***(苏州)有限公司 | Resultant force output middle shaft motor of electric bicycle |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109625146A (en) | 2019-04-16 |
| WO2020143340A1 (en) | 2020-07-16 |
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