TW201422481A - High speed ratio drive unit - Google Patents

Abstract

A high speed ratio drive unit includes a case, a cycloidal plate, an input axle, an output plate and a power assembly. The case has a first part of teeth. The cycloidal plate includes a second part of teeth and an assembly hole. The second part of teeth engages with the first part of teeth. The numbers of teeth of these two parts are different to result in a speed ratio. The input axle is embedded in the assembly hole of the cycloidal plate. The output plate center axis is same to the input axle. The output plate and the cycloidal plate move relatively to each other. The power assembly includes a rotor and a stator. The rotor is disposed on the input axle. The stator is attached on the case and faces to the rotor with an air gap.

Description

Deceleration power group

This proposal relates to a deceleration power pack, in particular to a deceleration power pack incorporating a reducer and a power unit.

As the oil crisis has surfaced, and oil prices are still high, countries around the world are doing everything they can to develop new energy sources. Moreover, the impact of the global warming effect is becoming more and more serious, leading to climate anomalies and frequent natural disasters. Therefore, how to reduce carbon dioxide emissions is a problem that countries attach great importance to now. With the rise of environmental awareness, the development of electric bicycles has also matured.

However, in order to make the electric bicycle have a large output torque, a gear reducer is usually installed on the electric bicycle. Current gear reducers are usually equipped with reduction gears of second order or more to achieve a 5 to 10 times reduction ratio. However, although the order of the gear reducer can be increased, a large reduction ratio can be obtained, but the overall thickness of the gear reducer is also increased. In addition, the electric bicycle is also provided with a power device, and the power device is axially connected with the gear reducer, so that the power device can drive the gear reducer to operate. As a result, the overall thickness of the power unit plus the gear reducer will be thickened, which is not conducive to the matching design of the vehicle space. Therefore, how to develop a deceleration power group with a thin thickness and a high reduction ratio will be one of the problems that developers must overcome.

In view of the above problems, this proposal is about a deceleration power group, so as to reduce The speed power pack has the advantages of thin thickness and high reduction ratio.

The deceleration power pack disclosed in the present proposal comprises a casing, a cycloidal disk, an input shaft, an output disk and a power portion. The outer casing has a first tooth portion that is disposed on an inner surface of the outer casing. The cycloidal disk includes a second tooth portion and an assembly hole. The second tooth portion is engaged with the first tooth portion. The number of teeth of the second tooth portion is different from the number of teeth of the first tooth portion to form a reduction ratio. The input shaft includes a rotor biasing carrier and a shaft. The rotor biasing carrier is embedded in the assembly hole. The shaft body is vertically erected on the rotor biasing carrier, and the axis of the shaft body and the center of the rotor biasing carrier have a distance from each other. The output disk and the cycloidal disk move relatively. The power unit includes a motor rotor and a motor stator. The rotor of the motor is sleeved on the shaft and is located on the rotor biasing carrier of the input shaft. The motor stator is disposed on the outer casing and faces the motor rotor at an air gap.

According to the deceleration power group disclosed in the above proposal, the cycloidal disk, the input shaft, the output disk and the power unit are all installed in the casing, and the motor rotor is disposed on the input shaft. In other words, the proposed deceleration power unit combines the two components of the motor rotor and the input shaft for deceleration into one, so that there is no need to transmit through the transmission shaft between the motor rotor and the input shaft, thereby making the deceleration power unit The overall thickness is thin.

In addition, the axis of the shaft of the input shaft and the center of the rotor biasing carrier have a distance from each other, and the motor stator forms an electromagnetic force on the motor rotor through the air gap to drive the rotation of the motor rotor, that is, the rotation of the input shaft that drives the eccentricity, the annular side plate Contacting the side wall of the assembly hole to push the cycloidal disk to revolve the input shaft, so that the second tooth portion of the cycloidal disk moves relative to the first tooth portion of the outer casing, thereby achieving the effect of decelerating and improving the torque.

The above description of the contents of this proposal and the description of the following implementations are used. To demonstrate and explain the principles of this proposal, and to provide a further explanation of the scope of the patent application for this proposal.

Please refer to FIG. 1 to FIG. 6 . FIG. 1 is a schematic perspective view showing the deceleration power assembly disclosed in the first embodiment, which is disposed on a part of the bicycle frame body, and FIG. 2 is a schematic cross-sectional view of the deceleration power unit in FIG. 1 . 3 is a partial enlarged view of Fig. 2, Fig. 4 is a schematic cross-sectional view of the deceleration power group of Fig. 1 from another perspective, Fig. 5 is an exploded view of the deceleration power group of Fig. 1, and Fig. 6 is the fifth A schematic plan view of the input shaft and the motor rotor of the figure. The deceleration power unit 10 of the present embodiment is configured to be assembled to the bicycle frame body 20, but is not limited to being located on the left side, the middle side or the right side of the bicycle.

The deceleration power pack 10 of the present embodiment includes a housing 100, a cycloidal disc 200, an input shaft 300, an output disc 400, and a power unit 500. The outer casing 100 has a first tooth portion 130, and the first tooth portion 130 is annularly disposed on the inner surface of the outer casing 100. In detail, the outer casing 100 includes a first housing 110 and a second housing 120. The first housing 110 is mounted on the second housing 120 to cover the cycloidal disk 200 , the input shaft 300 , the output disk 400 , and the power unit 500 . The first housing 110 and the second housing 120 respectively have a first housing shaft hole 111 and a second housing shaft hole 121. The first housing shaft hole 111 and the second housing shaft hole 121 penetrate the first housing 110 and the second housing 120, respectively.

The cycloidal disk 200 includes a second tooth portion 210 and an assembly hole 220. The second tooth portion 210 surrounds the assembly hole 220. The second tooth portion 210 is engaged with the first tooth portion 130. The number of teeth of the second tooth portion 210 is different from the number of teeth of the first tooth portion 130 to form a reduction ratio.

In detail, in this embodiment and other embodiments, the first tooth portion 130 includes A plurality of studs 131. The opposite ends of the studs 131 are respectively disposed on the first housing 110 and the second housing 120, so that the studs 131 are disposed on the inner surface of the outer casing 100, and the studs 131 surround the periphery of the cycloidal disc 200. And facing the second tooth portion 210 of the cycloidal disc 200, respectively. The second tooth portion 210 of the cycloidal disc 200 is engaged with a portion of the studs 131. The reduction ratio between the second tooth portion 210 of the cycloidal disk 200 and the first tooth portion 130 of the outer casing 100 is the ratio of the difference in the number of teeth between the first tooth portion 130 and the second tooth portion 210 to the number of teeth of the second tooth portion 210.

The input shaft 300 includes a rotor biasing carrier 310 and a shaft 320. The rotor bias carrier 310 is embedded in the assembly hole 220. The shaft body 320 is vertically erected on the rotor biasing carrier 310, and the axis C1 of the shaft body 320 and the center C2 of the rotor biasing carrier 310 have a spacing d from each other (as shown in FIG. 6). In other words, the axis of the shaft 320 of the input shaft 300 is offset from the center of the rotor biasing carrier 310. Furthermore, the rotor biasing carrier comprises a connected carrier plate 311 and an annular side plate 312. The annular side plate 312 is erected on the periphery of the carrier plate 311, and the annular side plate 312 abuts against the cycloidal disk 200 to form a wall surface of the assembly hole 220. The carrier plate 311 faces the cycloid disk 200 in the same direction. That is to say, the carrier plate 311 is parallel to the cycloidal disk 200. In addition, in the embodiment and other embodiments, the decelerating power pack 10 further includes a fourth bearing 840 disposed between the rotor biasing carrier 310 and the cycloidal disc 200 to allow the cycloidal disc 200 to rotate. .

The output disk 400 has a relative motion with the cycloid disk 200. In other words, the output tray 400 is movably disposed on the cycloidal disc 200. In detail, the output tray 400 includes a plurality of studs 410. The cycloidal disk 200 has a plurality of recessed holes 230. These recessed holes surround the assembly holes 220, respectively. The protrusions 410 move in the recesses 230, respectively, and the output tray The 400 contacts the stud 410 by the recess 230 of the cycloidal disc 200, thereby driving the output disc 400 to move, and rotating the output disc 400 relative to the cycloidal disc 200.

The power unit 500 includes a motor rotor 510 and a motor stator 520. The motor rotor 510 is sleeved on the shaft body 320 and is located in a recess of the rotor biasing carrier 310 of the input shaft 300. The motor stator 520 is disposed on the outer casing 100 and faces the motor rotor 510 from an air gap. In detail, the motor rotor 510 includes an annular disk 511 and a plurality of first magnetic members 512. The annular disk 511 is disposed on the carrier plate 311. These first magnetic members 512 are spaced apart along the circumference of the annular disk 511, and these first magnetic members 512 face the same direction as the annular disk 511. The motor stator 520 includes an annular fixing frame 521 and a plurality of second magnetic members 522. The annular fixing frame 521 is fixed to the first housing 110, and the second magnetic members 522 are disposed on the annular fixing frame 521 and face the first magnetic members 512, respectively. In addition, the power unit 500 of the embodiment is an axial flux motor, but not limited thereto. In other embodiments, the power unit 500 may also be a radial flux motor plus a connecting member (not shown). The connector is placed in the mounting position of the motor rotor 510.

Since the conventional reducer and the power unit need to be connected through the transmission shaft, the conventional reducer increases the volume of the drive shaft and increases the overall thickness. However, the motor rotor 510 of the embodiment is directly disposed on the input shaft 300, and the input shaft 300 is further Embedded in the cycloidal disc 200, the motor rotor 510, the input shaft 300 and the cycloidal disc 200 are substantially combined into one element. As a result, the motor rotor 510 and the input shaft 300 are no longer required to be connected through the transmission shaft, thereby making the overall thickness of the deceleration power pack 10 thin. And the motor stator 520 forms an electromagnetic force on the motor rotor 510 through the air gap to drive the motor rotor 510 to rotate, that is, the eccentric input shaft 300 is rotated, and the annular side plate 312 is assembled. The side wall of the hole 220 pushes the cycloidal disk 200 to revolve the input shaft 300, so that the second tooth portion 210 of the cycloidal disk 200 moves relative to the first tooth portion 130 of the outer casing 100. When the input shaft 300 rotates once, the output disk 400 rotates. One tooth, while achieving deceleration and improving the torque effect.

In this and other embodiments, the input shaft 300 includes a drive shaft 330. The drive shaft 330 penetrates the shaft body 320 and the outer casing 100, and the drive shaft 330 is engaged with the shaft body 320 to drive the input shaft 300 to rotate. In order to make the driving shaft 330 rotate more smoothly, the deceleration power unit 10 further includes two first bearings 810 respectively sleeved on opposite ends of the driving shaft 330, and the two first bearings 810 are respectively mounted on the first housing shaft. The hole 111 and the second housing shaft hole 121 reduce the rotational resistance between the drive shaft 330 and the outer casing 100.

In the present embodiment and other embodiments, the deceleration power group 10 further includes two pedal groups 600. The two pedal groups 600 are respectively disposed at opposite ends of the driving shaft 330.

In this embodiment and other embodiments, the deceleration power pack 10 further includes an output wheel set 700. The output wheel set 700 is mounted to the output disk 400 to rotate the output wheel set 700 with the output disk 400. In detail, the output wheel set 700 includes a sprocket mount 710 and a sprocket 720. The sprocket mount 710 is disposed on the output disc 400, and the sprocket 720 is fixed to the sprocket mount 710 to rotate the sprocket 720 along with the output disc 400. The sprocket 720 is used to drive the driving wheel of the bicycle through the chain.

In the embodiment and other embodiments, the decelerating power pack 10 further includes a second bearing 820 and a third bearing 830 in order to make the rotational resistance of the deceleration power unit 10 smaller. The second bearing 820 is mounted on the first housing 110 and sleeved on the shaft 320 of the input shaft 300 and abuts against the outer surface of the shaft 320 to assist the rotation of the input shaft 300.

The third bearing 830 is disposed between the output disc 400 and the second housing 120 to reduce the rotational resistance between the output disc 400 and the second housing 120. The first bearing 810 adjacent to the output disk 400 is located in the second housing shaft hole 121 of the second housing 120 and is disposed between the drive shaft 330 and the output disk 400 to reduce the rotational resistance between the drive shaft 330 and the output disk 400.

According to the deceleration power group disclosed in the above proposal, the cycloidal disk, the input shaft, the output disk and the power unit are all installed in the casing, and the motor rotor is disposed on the input shaft. In other words, the proposed deceleration power unit combines the input shaft for power supply and the input shaft for deceleration into one, so that there is no need to transmit through the transmission shaft between the motor rotor and the input shaft, thereby making the deceleration power unit The overall thickness is thin.

In addition, the idea of embedding the motor rotor in the input member of the reduction mechanism or sharing the motor rotor with the input member of the reduction mechanism can also be applied to a harmonic reduction mechanism, a high reduction ratio gear mechanism, or other deceleration that can generate a high reduction ratio. mechanism.

In addition, the axis of the shaft of the input shaft and the center of the rotor biasing carrier have a distance from each other, and the motor stator forms an electromagnetic force on the motor rotor through the air gap to drive the rotation of the motor rotor, that is, the rotation of the input shaft that drives the eccentricity, the annular side plate Contacting the side wall of the assembly hole to push the cycloidal disk to revolve the input shaft, so that the second tooth portion of the cycloidal disk moves relative to the first tooth portion of the outer casing, thereby achieving the effect of decelerating and improving the torque.

Although the embodiments of the present disclosure are as described above, it is not intended to limit the proposal, and any person skilled in the art, regardless of the spirit and scope of the proposal, shall have the shape, structure, and features described in the scope of application of the proposal. And the quantity can be changed a little, so the scope of patent protection of this proposal must be based on the application attached to this manual. The scope defined by the scope of interest is subject to change.

10‧‧‧Deceleration Power Group

20‧‧‧Bicycle frame

100‧‧‧ Shell

110‧‧‧First housing

111‧‧‧First housing shaft hole

120‧‧‧second housing

121‧‧‧Second housing shaft hole

130‧‧‧First tooth

131‧‧‧ tooth column

200‧‧‧Cycloid

210‧‧‧Second tooth

220‧‧‧Assembled holes

230‧‧‧ recessed hole

300‧‧‧ input shaft

310‧‧‧Rotor offset carrier

311‧‧‧Loading board

312‧‧‧ring side panel

320‧‧‧Axis body

330‧‧‧Drive shaft

400‧‧‧ Output tray

410‧‧‧Bump

500‧‧‧Power Department

510‧‧‧Motor rotor

511‧‧‧ring disk

512‧‧‧First magnetic parts

520‧‧‧Motor stator

521‧‧‧ ring holder

522‧‧‧Second magnetic parts

600‧‧‧ pedal group

700‧‧‧Output wheel set

710‧‧‧Sprocket holder

720‧‧‧Sprocket

810‧‧‧First bearing

820‧‧‧second bearing

830‧‧‧ third bearing

840‧‧‧fourth bearing

FIG. 1 is a perspective view showing the assembly of the deceleration power disclosed in the first embodiment on a part of the bicycle frame body.

Fig. 2 is a schematic cross-sectional view showing the decelerating power unit of Fig. 1.

Fig. 3 is a partially enlarged schematic view of Fig. 2.

Fig. 4 is a schematic cross-sectional view showing another view of the deceleration power group of Fig. 1.

Fig. 5 is an exploded perspective view of the deceleration power unit of Fig. 1.

Figure 6 is a plan view of the input shaft and the motor rotor of Figure 5.

110‧‧‧First housing

130‧‧‧First tooth

131‧‧‧ tooth column

200‧‧‧Cycloid

210‧‧‧Second tooth

300‧‧‧ input shaft

310‧‧‧Rotor offset carrier

320‧‧‧Axis body

510‧‧‧Motor rotor

840‧‧‧fourth bearing

Claims (13)

A deceleration power unit includes: a casing having a first tooth portion disposed on an inner surface of the casing; a cycloid disk including a second tooth portion and an assembly hole, the second tooth portion engaging In the first tooth portion, the number of teeth of the second tooth portion is different from the number of teeth of the first tooth portion to form a reduction ratio; an input shaft includes a rotor bias carrier and a shaft body, and the rotor bias load Embedded in the assembly hole, the shaft body is vertically erected on the rotor biasing carrier, and the axis of the shaft body and the center of the rotor biasing carrier have a spacing from each other; an output disk, and the cycloid The disk has a relative motion; and a power portion includes a motor rotor and a motor stator, the motor rotor is sleeved on the shaft body and the rotor biasing carrier on the input shaft, the motor stator is disposed on the outer casing, and Facing the motor rotor. The deceleration power group of claim 1, further comprising two first bearings, the outer casing having a first housing shaft hole and a second housing shaft hole, the first housing shaft hole and the second a shaft hole of the housing is respectively inserted through the outer casing, the input shaft includes a driving shaft penetrating the shaft body, the two first bearings are respectively sleeved on opposite ends of the driving shaft, and the two first bearings are respectively mounted on the shaft a first housing shaft bore and the second housing shaft bore. The deceleration power group according to claim 2 further includes two pedal groups, and the two pedal groups are respectively disposed at opposite ends of the driving shaft. The deceleration power unit of claim 2, wherein the outer casing comprises a first housing And a second housing, the first housing is mounted on the second housing, the first housing shaft hole is located in the first housing, and the second housing shaft hole is located on the second housing . The decelerating power unit of claim 4, wherein the first tooth portion includes a plurality of tooth columns, and opposite ends of the tooth columns are respectively pivotally disposed on the first housing and the second housing, A stud surrounds the cycloidal disk and faces the second tooth portion of the cycloidal disc, respectively. The deceleration power unit of claim 4 further includes a second bearing mounted on the first housing and sleeved on the shaft body. The deceleration power unit of claim 4, wherein the rotor biasing carrier comprises a connected carrier plate and an annular side plate, the annular side plate abutting against the cycloidal disk to form a wall surface of the assembly hole, the carrier plate The motor rotor is disposed on the carrier plate, and the motor stator is fixed to the first housing and faces the motor rotor. The deceleration power unit of claim 7, wherein the motor rotor comprises an annular disk and a plurality of first magnetic members, the annular disk is disposed on the carrier plate, and the first magnetic members are spaced along the circumference of the annular disk. Arranging, and the first magnetic members and the annular disk face in the same direction, the motor stator includes an annular fixing frame and a plurality of second magnetic members, the annular fixing frame is fixed to the first housing, and the second The magnetic member is disposed on the annular fixing frame and faces the first magnetic members respectively. The deceleration power group according to claim 8, further comprising an output wheel set mounted on the output disk. The deceleration power group of claim 9, wherein the output wheel set is embedded in One of the output discs has a sprocket mount and a sprocket fixed to the sprocket mount. The deceleration power unit of claim 10, further comprising a third bearing disposed between the output disk and the second housing, the first bearing adjacent to the output disk being located in the second housing shaft hole, And disposed between the output disc and the drive shaft. The deceleration power unit of claim 1, wherein the output disk comprises a plurality of protrusions, the cycloid disk has a plurality of concave holes, the concave holes respectively surrounding the assembly holes, and the protrusions are respectively movable Inside the recesses. The deceleration power unit of claim 1, wherein the power unit is an axial flux motor.