CN214690025U

CN214690025U - Hub motor integrated with speed change mechanism

Info

Publication number: CN214690025U
Application number: CN202120814657.7U
Authority: CN
Inventors: 王清华; 王英喆; 邹斌; 黄善劲; 张苏北
Original assignee: Bafang Electric Suzhou Co Ltd
Current assignee: Bafang Electric Suzhou Co Ltd
Priority date: 2021-04-20
Filing date: 2021-04-20
Publication date: 2021-11-12
Anticipated expiration: 2031-04-20

Abstract

The utility model discloses an integrated speed change mechanism's in-wheel motor, it relates to the in-wheel motor field. The technical scheme is characterized by comprising a main shaft, wherein a hub and an end cover which are connected with each other are arranged on the main shaft, a machine core assembly connected with the hub and a speed change mechanism connected with the end cover are respectively arranged on the main shaft, and the speed change mechanism comprises a centrifugal driving assembly; the centrifugal driving assembly is connected with the end cover, and the state switching is realized according to the rotating speed of the end cover. The utility model discloses realize the automatic switch-over that keeps off the position according to output speed, can reduce the frequency of shifting, increase of service life to improve the experience of riding.

Description

Hub motor integrated with speed change mechanism

Technical Field

The utility model relates to an in-wheel motor field, more specifically say, it relates to an integrated speed change mechanism's in-wheel motor.

Background

A typical internal speed change mechanism utilizes centrifugal force to realize automatic speed change, and when a certain step frequency speed is reached, the centrifugal block is thrown away to realize automatic upshift, and when the step frequency speed is reduced below a speed change point, the centrifugal block is contracted to realize automatic downshift, as shown in chinese patent No. CN 208882034U.

The prior Chinese patent with the publication number of CN211996037U discloses an integrated device of an in-wheel motor and an internal speed-changing hub, which comprises a main shaft, wherein the main shaft is respectively sleeved with the internal speed-changing hub and the in-wheel motor, an end cover is arranged on the internal speed-changing hub, the in-wheel motor comprises a winding stator, a rotor, a sun gear, a motor clutch, an inner gear ring and a hub, the internal speed-changing hub adopts a centrifugal internal speed-changing hub, and the speed can be automatically adjusted according to the rotating speed of a flywheel.

The centrifugal speed-changing hub in the patent utilizes centrifugal force to realize automatic speed change, when a certain pedaling speed is reached, the centrifugal block is thrown away to realize automatic gear-up, and when the pedaling speed is reduced below a speed-changing point, the centrifugal block is contracted to realize automatic gear-down.

However, for a vehicle using the hub motor and the internal shift hub integrated device, when the vehicle is running at a high speed (greater than a shift point), if a rider does not want to step on the hub motor or does not need to step on the hub motor or the hub motor and the internal shift hub integrated device in a downhill, the internal shift hub can automatically downshift due to the reduction of the stepping frequency speed of the rider; when the vehicle still keeps high speed (greater than the speed change point) after sliding for a certain distance, the rider needs to make the pedaling speed reach the speed change point within a short time after pedaling again so as to automatically upshift the internal speed change hub. The experience of riding can be influenced to the automatic downshift of interior variable speed flower-drum under this kind of condition, and the increase of the frequency of shifting moreover leads to the trouble of interior variable speed flower-drum easily, influences its life.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide an integrated speed change mechanism's in-wheel motor, it realizes the automatic switch-over that keeps off the position according to output speed, can reduce the frequency of shifting, increase of service life to improve and ride and experience.

In order to achieve the above purpose, the utility model provides a following technical scheme:

a hub motor integrated with a speed change mechanism comprises a main shaft, wherein a hub and an end cover which are connected with each other are arranged on the main shaft, a core assembly connected with the hub and the speed change mechanism connected with the end cover are respectively arranged on the main shaft, and the speed change mechanism comprises a centrifugal driving assembly;

the centrifugal driving assembly is connected with the end cover, and the state switching is realized according to the rotating speed of the end cover.

Furthermore, the centrifugal driving assembly comprises a centrifugal block, and a shaft rod connected with the end cover is arranged on the centrifugal block in a penetrating manner; the centrifugal block can be switched to a throwing-away state from a contraction state according to the rotating speed of the end cover.

Further, the centrifugal block number is at least two, and the centrifugal driving assembly further comprises an elastic resetting piece connected with only one centrifugal block.

Furthermore, the inner end wall of the end cover is provided with a ring plate, the end part of the ring plate is fixedly provided with a positioning plate, and the positioning plate and the end cover are matched to form a shell of the speed change mechanism.

Furthermore, one end of the shaft rod is connected with the positioning plate, and the other end of the shaft rod is connected with the end cover; the annular plate is positioned on the outer side of the centrifugal block and can play a role in radially limiting the centrifugal block.

Furthermore, the inner side wall of the ring plate is provided with a clamping groove matched with the positioning plate.

Furthermore, the speed change mechanism also comprises a planet carrier, a sun gear and a gear ring, wherein the sun gear and the gear ring are fixedly arranged on the main shaft, and the planet carrier is provided with a planet gear which is meshed with the sun gear and the gear ring; a first clutch assembly is arranged between the planet carrier and the end cover, and a second clutch assembly is arranged between the gear ring and the positioning plate; the centrifugal driving assembly controls transmission between the gear ring and the positioning plate by limiting or releasing the second clutch assembly.

Further, the second clutch assembly comprises a pawl seat, a pawl, a ratchet wheel and a spring ring, wherein the pawl seat is fixedly connected with the positioning plate, and the ratchet wheel and the gear ring can be linked along the circumferential direction; the centrifugal driving assembly further comprises a limiting plate connected with the centrifugal block, and a release groove matched with the pawl is formed in the limiting plate; the limiting plate can press the pawl to enable the pawl to be not meshed with the ratchet wheel, and the centrifugal block can drive the limiting plate to rotate after rotating and throwing away so that the pawl is embedded in the release groove and meshed with the ratchet wheel.

Furthermore, the centrifugal block is provided with a swing arm for driving the limiting plate to rotate.

Further, the centrifugal mass is located radially outward of the second clutch assembly.

To sum up, the utility model discloses following beneficial effect has:

1. the automatic gear shifting is realized by utilizing the output speed, the riding experience can be improved, the gear shifting frequency is reduced, and the service life is prolonged;

2. considering the influence of raw materials and processing technology, even if the difference inevitably exists between the elastic resetting pieces of the same specification, if a plurality of elastic resetting pieces are adopted, the resetting of the limiting plate can be influenced, and the problem can be avoided by only arranging one elastic resetting piece, so that the smooth resetting of the limiting plate is ensured.

Drawings

FIG. 1 is a schematic overall structure diagram of an integrated transmission mechanism in an embodiment of an in-wheel motor;

FIG. 2 is an exploded view of an integrated transmission mechanism in an embodiment of the present invention;

FIG. 3 is a cross-sectional view of the shifting mechanism in the embodiment;

FIG. 4 is a schematic structural diagram of a centrifugal drive assembly according to an embodiment;

FIG. 5 is a schematic structural diagram of the ratchet and the ring gear in the embodiment.

In the figure: 1. a main shaft; 21. a hub; 22. an end cap; 31. a planet carrier; 311. a tooth sheet; 32. a planet wheel; 33. a sun gear; 34. a ring gear; 341. a second protrusion; 4. a first clutch assembly; 51. a pawl seat; 52. a pawl; 53. a ratchet wheel; 531. a first protrusion; 6. positioning a plate; 61. a yielding sink groove; 71. a centrifugal block; 72. a shaft lever; 73. a torsion spring; 74. a pin; 75. swinging arms; 751. a drive rod; 76. a limiting plate; 761. a relief groove; 762. a drive aperture; 81. a first bearing; 82. a second bearing; 83. a third bearing; 91. a stator-rotor assembly; 92. a speed reduction assembly.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Example (b):

a hub motor integrated with a speed change mechanism refers to fig. 1 to 5, and comprises a main shaft 1, wherein a hub 21 and an end cover 22 which are connected with each other are arranged on the main shaft 1, and the hub 21 and the end cover 22 are connected through screws and used for outputting rotating speed; the main shaft 1 is respectively provided with a movement assembly connected with the hub 21 and a speed change mechanism connected with the end cover 22, in the embodiment, the speed change mechanism can input the pedal rotating speed to drive the end cover 22 and the hub 21 to rotate and drive the vehicle to move forward, and the movement assembly can input the motor rotating speed to drive the hub 21 and the end cover 22 to rotate and assist the vehicle to move forward; the speed change mechanism comprises a centrifugal driving assembly, the centrifugal driving assembly is connected with the end cover 22, and the state switching is realized according to the rotating speed of the end cover 22; the in-wheel motor in this embodiment changes the state of centrifugal drive assembly according to the output speed of wheel hub 21 and end cover 22, rather than stepping on frequently speed to can reduce speed change mechanism's the frequency of shifting, increase of service life, and improve the experience of riding.

Referring to fig. 1 and 2, in the present embodiment, the core assembly includes a stator and rotor assembly 91 and a speed reduction assembly 92, and the rotor speed of the stator and rotor assembly 91 is input to the hub 21 after passing through the speed reduction assembly 92, so as to form a speed reduction motor structure; in this embodiment, the speed reduction assembly 92 is a planetary speed reduction assembly, the planetary speed reduction assembly includes a sun gear connected with the rotor, a planetary clutch sleeved on the main shaft 1, and an inner gear ring connected with the hub 21, and the planetary clutch is provided with a planetary gear engaged with the sun gear and the inner gear ring; the planetary clutch belongs to the prior art, and is not described herein.

Referring to fig. 3 to 5, the centrifugal driving assembly includes a centrifugal block 71, a shaft rod 72 connected to the end cover 22 is disposed on the centrifugal block 71, and the centrifugal block 71 can rotate around the shaft rod 72; the centrifugal block 71 can be switched from a contraction state to a throwing state according to the rotating speed of the end cover 22; in the embodiment, a ring plate is arranged on the inner end wall of the end cover 22, a positioning plate 6 is fixedly arranged at the end part of the ring plate, and the positioning plate 6 is matched with the end cover 22 to form a shell of the speed change mechanism; one end of the shaft rod 72 is connected with the positioning plate 6, and the other end is connected with the end cover 22; meanwhile, the ring plate is positioned on the outer side of the centrifugal block 71, and can play a role in radially limiting the centrifugal block 71, namely the centrifugal block 71 cannot continue to rotate after being contacted with the inner side wall of the ring plate; in this embodiment, one end of the shaft rod 72 is directly connected to the end cover 22, and the inner end wall of the end cover 22 extends to form a ring plate, in other alternative embodiments, an installation seat may be fixedly connected to the inner end wall of the end cover 22, the end of the shaft rod 72 is connected to the installation seat, and the installation seat radially limits the centrifugal block 71.

Referring to fig. 3, in the present embodiment, the positioning plate 6 is connected to the ring plate through a screw, and meanwhile, a clamping groove matched with the positioning plate 6 is formed at an end portion of an inner side wall of the ring plate, so that the positioning plate 6 can be axially and radially limited through the clamping groove, thereby ensuring assembly accuracy; in the embodiment, the centrifugal blocks 71 are two in number, and the centrifugal driving assembly further includes an elastic reset member connected to only one centrifugal block 71; in the embodiment, the elastic resetting member is a torsion spring 73, and the elastic force of the torsion spring 73 makes the centrifugal block 71 have a tendency of resetting to a contracted state; specifically, the torsion spring 73 is sleeved on the shaft rod 72, and one end thereof is connected with the centrifugal block 71, and the other end thereof is connected with the positioning plate 6.

Referring to fig. 3 to 5, the transmission mechanism further includes a planet carrier 31, a sun gear 33 fixedly disposed on the main shaft 1, and a ring gear 34, and the planet carrier 31 is provided with a planet gear 32 engaged with the sun gear 33 and the ring gear 34; a first clutch assembly 4 is arranged between the planet carrier 31 and the end cover 22, and a second clutch assembly is arranged between the gear ring 34 and the positioning plate 6; the centrifugal driving assembly controls the transmission between the gear ring 34 and the positioning plate 6 by limiting or releasing the second clutch assembly; specifically, in the present embodiment, a second bearing 82 is disposed between the planet carrier 31 and the end cover 22, a third bearing 83 is disposed between the ring gear 34 and the end cover 22, and two first bearings 81 are disposed between the main shaft 1 and the planet carrier 31; the planet carrier 31 is provided with a tooth sheet 311 which is linked with the planet carrier along the circumferential direction, and the planet carrier 31 is driven to rotate by the tooth sheet 311 to input the pedal rotating speed; in the embodiment, the two gears can be changed by adopting one group of planetary gear assemblies, and if more gears are to be changed, the two gears can be changed by adopting a mode of connecting and driving a plurality of groups of planetary gear assemblies; of course, in alternative embodiments, the planetary gear assembly may be replaced by other structures, and is not limited herein.

Referring to fig. 3 to 5, the second clutch assembly includes a pawl seat 51, a pawl 52, a ratchet wheel 53 and a spring ring, wherein the pawl seat 51 is fixedly connected with the inner end surface of the positioning plate 6, and the ratchet wheel 53 and the gear ring 34 can be linked in a circumferential direction; the centrifugal driving assembly further comprises a limiting plate 76 connected with the centrifugal block 71, and a release groove 761 matched with the pawl 52 is formed in the limiting plate 76; the limiting plate 76 can press the pawl 52 to prevent the pawl from being meshed with the ratchet wheel 53, and the centrifugal block 71 rotates and throws away to drive the limiting plate 76 to rotate so that the pawl 52 is embedded in the release groove 761 and meshed with the ratchet wheel 53; specifically, when the centrifugal block 71 is in a contracted state, the inner side wall of the limiting plate 76 is in contact with the pawl 52, so that the engaging end of the pawl 52 cannot be bounced to be engaged with the ratchet wheel 53, and the second clutch assembly cannot realize transmission under the limiting action of the centrifugal driving assembly; after being thrown away, the centrifugal block 71 drives the limiting plate 76 to rotate, so that the release groove 761 is opposite to the pawl 52, then the engaging end of the pawl 52 is bounced and embedded into the release groove 761 and is engaged with the ratchet wheel 53, and then the second clutch assembly can realize transmission after being released by the centrifugal driving assembly.

Referring to fig. 3 and 5, in the present embodiment, the gear ring 34 includes two inner circumferential sidewalls with different inner diameters, one of the inner circumferential sidewalls is provided with inner teeth matched with the planet gears 32, and the other inner circumferential sidewall is uniformly provided with a plurality of second protrusions 341; the outer circumferential side wall of the ratchet 53 is uniformly provided with the first protrusions 531, the first protrusions 531 are in contact with the second protrusions 341 to realize circumferential linkage of the ratchet 53 and the gear ring 34, and the ratchet 53 and the gear ring 34 are in linkage through the first protrusions 531 and the second protrusions 341 to provide buffering during gear shifting, so that riding experience is improved.

Referring to fig. 3 and 4, in the present embodiment, the centrifugal mass 71 is disposed radially outside the second clutch assembly, so that the axial dimension can be reduced; the centrifugal block 71 is provided with a swing arm 75 for driving the limit plate 76 to rotate, specifically, the swing arm 75 is provided with a driving rod 751, the limit plate 76 is provided with a driving hole 762 matched with the driving rod 751, and the driving hole 762 is a waist hole; the positioning plate 6 is provided with a yielding sinking groove 61 matched with the swing arm 75, so that the axial size can be reduced; the centrifugal block 71 and the swing arm 75 are connected through a pin 74, and the position of the pin 74 relative to the centrifugal block 71 and the position of the swing arm 75 in the circumferential direction are fixed, so that the centrifugal block 71 can drive the swing arm 75 to deflect through the pin 74; after the swing arm 75 deflects, the driving rod 751 contacts with the inner wall of the driving hole 762, and drives the limit plate 76 to rotate.

The working principle is as follows:

the rotating speed of the pedal power is transmitted to the tooth piece 311, the tooth piece 311 drives the planet carrier 31 to rotate, the sun gear 33 is fixed, the planet carrier 31 drives the gear ring 34 to rotate through the planet gear 32, and the rotating speed of the gear ring 34 is greater than that of the planet carrier 31.

And (3) in low gear: when the centrifugal block 71 is in a contracted state, the pawl 52 in the second clutch assembly cannot be meshed with the ratchet wheel 53 under the limitation of the limit plate 76, and the rotating speed of the gear ring 34 cannot be transmitted to the end cover 22 through the second clutch assembly; at this time, the planet carrier 31 drives the end cover 22 to rotate through the first clutch assembly 4, so as to realize power output.

When the gear is high: after the rotation speed of the end cover 22 reaches the speed change point, the centrifugal block 71 rotates to a throw-away state under the action of centrifugal force, and the swing arm 75 drives the limit plate 76 to rotate, so that the pawl 52 in the second clutch assembly is opposite to the release groove 761; the engaging end of the pawl 52 is inserted into the release groove 761 after being bounced and is engaged with the ratchet wheel 53, at the moment, the second clutch assembly can realize transmission, and the rotating speed of the gear ring 34 is transmitted to the end cover 22 through the second clutch assembly to realize power output; at this time, the rotation speed of the end cover 22 is greater than that of the planet carrier 31, and the first clutch assembly 4 is in an overrunning state.

Electric power assisting: after the wheel hub 21 and the end cover 22 are driven to rotate by the pedal power, the movement assembly is started to input the rotating speed to the wheel hub 21, and the power-assisted vehicle moves forward, so that the aim of saving labor is fulfilled.

Adopt end cover 22 as power take-off unit to control centrifugal drive assembly, if the rotational speed of end cover 22 is greater than the speed change point, and the passerby does not want to trample, or need not trample in the downhill path, speed change mechanism can still keep in high fender state, need not change through changing the step frequency when the passerby tramples once more and shift gears to improve the experience of riding, this in-process speed change mechanism's fender position can not change moreover, can reduce the frequency of shifting gears, extension speed change mechanism's life.

Claims

1. A hub motor integrated with a speed change mechanism comprises a main shaft, wherein a hub and an end cover which are connected with each other are arranged on the main shaft, a core assembly connected with the hub and the speed change mechanism connected with the end cover are respectively arranged on the main shaft, and the speed change mechanism comprises a centrifugal driving assembly;

the method is characterized in that: the centrifugal driving assembly is connected with the end cover, and the state switching is realized according to the rotating speed of the end cover.

2. The integrated variator hub motor of claim 1, wherein: the centrifugal driving assembly comprises a centrifugal block, and a shaft lever connected with the end cover is arranged on the centrifugal block in a penetrating manner; the centrifugal block can be switched to a throwing-away state from a contraction state according to the rotating speed of the end cover.

3. The integrated variator hub motor of claim 2, wherein: the centrifugal driving assembly comprises at least two centrifugal blocks, and further comprises an elastic resetting piece connected with only one centrifugal block.

4. The integrated variator hub motor of claim 2, wherein: the inner end wall of the end cover is provided with a ring plate, the end part of the ring plate is fixedly provided with a positioning plate, and the positioning plate is matched with the end cover to form a shell of the speed change mechanism.

5. The integrated variator hub motor of claim 4, wherein: one end of the shaft lever is connected with the positioning plate, and the other end of the shaft lever is connected with the end cover; the annular plate is positioned on the outer side of the centrifugal block and can play a role in radially limiting the centrifugal block.

6. The integrated variator hub motor of claim 4, wherein: and a clamping groove matched with the positioning plate is formed in the inner side wall of the ring plate.

7. The integrated variator hub motor of claim 4, wherein: the speed change mechanism also comprises a planet carrier, a sun gear and a gear ring, wherein the sun gear and the gear ring are fixedly arranged on the main shaft, and the planet carrier is provided with a planet gear which is meshed with the sun gear and the gear ring; a first clutch assembly is arranged between the planet carrier and the end cover, and a second clutch assembly is arranged between the gear ring and the positioning plate; the centrifugal driving assembly controls transmission between the gear ring and the positioning plate by limiting or releasing the second clutch assembly.

8. The integrated variator's in-wheel motor of claim 7, wherein: the second clutch assembly comprises a pawl seat, a pawl, a ratchet wheel and a spring ring, wherein the pawl seat is fixedly connected with the positioning plate, and the ratchet wheel and the gear ring can be linked along the circumferential direction; the centrifugal driving assembly further comprises a limiting plate connected with the centrifugal block, and a release groove matched with the pawl is formed in the limiting plate; the limiting plate can press the pawl to enable the pawl to be not meshed with the ratchet wheel, and the centrifugal block can drive the limiting plate to rotate after rotating and throwing away so that the pawl is embedded in the release groove and meshed with the ratchet wheel.

9. The integrated variator hub motor of claim 8, wherein: the centrifugal block is provided with a swing arm used for driving the limiting plate to rotate.

10. The integrated variator's in-wheel motor of claim 7, wherein: the centrifugal block is located on the outer side of the second clutch assembly in the radial direction.