TWM657219U - Mid motor transmission device of bicycle - Google Patents

Abstract

The invention proposes a mid-motor transmission device for a bicycle, which has an outer shell, an output shaft, a motor, and a clutch assembly. The clutch assembly is inside the outer shell and has a drive ring, a clutch gear, an output gear, and a pusher. The drive ring is connected to the motor. The clutch gear moves axially in the drive ring and is attracted by a magnet. The output gear is connected to the output shaft and is detachably connected to the clutch gear. The pusher is located on one side of the clutch gear and is magnetic. The pusher has a shell, a push plate, and an elastic member. The push plate moves axially in the housing, and the elastic member abuts against the push plate and the housing. The clutch gear can drive the push plate to rotate to push itself to engage the output gear, and the elastic member and the pusher can reset the push plate; after the clutch gear and the output gear are separated, the pusher can reset the clutch gear.

Description

Bicycle mid-mounted motor drive

This invention relates to a transmission device, and in particular to a mid-mounted motor transmission device for a bicycle.

Due to the promotion of leisure life and the rise of environmental awareness, the number of people riding bicycles is increasing, and the areas of use are becoming more and more extensive. However, for some areas with steep terrain or the need for long-distance riding, or simply for riders with insufficient physical strength, they may encounter more difficult situations when riding a bicycle. Therefore, in addition to the common human-powered bicycles that are pedaled entirely by human power, electric-assisted bicycles have also been developed to allow riders to save physical strength.

Most electric assist bicycles use motors installed on the bicycle to output power to assist the rider to move forward. Among them, there is a mid-drive unit (or mid-motor), which is named because it is not installed on the front or rear wheel, but on the bicycle's middle axle (or bottom bracket axle). The mid-drive motor provides power output to the bicycle's middle axle, so the rider can save the physical effort of pedaling.

However, due to regulatory restrictions, the speed that a mid-mounted motor can provide has an upper limit. If the speed of a bicycle reaches the regulatory limit, the motor must be powered off and stop providing power. However, if the transmission device of the mid-mounted motor is still connected to each other at this time, the driven structure needs to drive the active structure in turn, thus consuming the rider's physical strength. Therefore, a clutch structure is needed to separate the active structure and the driven structure when the motor is powered off, which can also reduce the wear of the transmission device parts.

In addition, since the mid-mounted motor is installed at the middle axis of the bicycle, it needs to constantly withstand the pedaling vibration of the rider, and most mid-mounted motors also need to be equipped with a multi-speed reduction gearbox, so the space is very compact and narrow. Therefore, how to install a clutch structure in the narrow space of the mid-mounted motor and ensure that the clutch is stably engaged while withstanding the constant pedaling vibration is a topic that needs to be considered and developed.

The main purpose of this invention is to provide a mid-mounted motor transmission device for a bicycle, which has a clutch function and can separate or combine the transmission between the motor and the driven side.

To achieve the above-mentioned purpose, the invention proposes a mid-mounted motor transmission device for a bicycle, which comprises: an outer shell having two opposite sides; an output shaft penetrating the two opposite sides of the outer shell, the output shaft having: a transmission tooth portion protruding from the outer peripheral surface of the output shaft; a motor disposed in the outer shell; and a clutch assembly disposed in the outer shell, the clutch assembly connecting the output shaft and the motor, the clutch assembly comprising: a drive ring connected to the motor, thereby being driven to rotate by the motor, the drive ring having: An outer ring tooth portion formed on the outer circumference of the driving ring, the motor is connected to the outer ring tooth portion; and An inner ring tooth portion formed on the inner circumference of the driving ring; A clutch gear, which is arranged in the driving ring and can move along the axial direction of the driving ring, and the clutch gear contains a material that can be attracted by magnetism; the clutch gear has: A clutch ring tooth portion formed on the outer circumference of the clutch gear and meshing with the inner ring tooth portion of the driving ring; A plurality of first toothed parts formed on one end face of the clutch gear, the first toothed parts surround the rotation center of the clutch gear and are connected to each other; and A first abutment part formed on the other end face of the clutch gear; An output gear connected to the output shaft and capable of driving the output shaft to rotate, the output gear and the clutch gear are detachably connected to each other; the output gear has: An output annular tooth part formed on the outer peripheral surface of the output gear and meshing with the driving tooth part of the output shaft; A plurality of second toothed parts, which are formed on an end face of the output gear facing the clutch gear, the second toothed parts surround the rotation center of the output gear, and the second toothed parts are connected to each other, and the second toothed parts selectively interlock with the first toothed parts; and A pusher, which is located on a side of the clutch gear relative to the output gear, the pusher is magnetic, and the pusher includes: A housing, which surrounds a setting space and is formed with an opening, the opening is connected to the setting space, and the opening faces the clutch gear, the housing has: An inner bottom surface, which is located in the setting space and faces the opening; and A first sliding portion formed on the inner bottom surface; A push plate located in the setting space and capable of moving in the axial direction of the housing, the push plate having: A second abutting portion formed on a side of the push plate facing the opening, the second abutting portion and the first abutting portion can be detachably abutted against each other, whereby the clutch gear drives the push plate to rotate; and A second sliding portion formed on a side of the push plate facing the inner bottom surface and capable of sliding relative to the first sliding portion; and An elastic member located in the setting space, the elastic member abutting against the push plate and the periphery of the opening of the housing.

Therefore, the advantage of this invention is that after the motor stops outputting power, the clutch gear can be separated from the output gear, thereby avoiding resistance caused by the user's pedaling and continuous wear of the clutch gear and the output gear; on the other hand, when the motor outputs power, the push plate can push the clutch gear to engage with the output gear, thereby transmitting power to the output shaft.

In the mid-mounted motor transmission device of the bicycle as described above, the clutch assembly further includes a transmission shaft, which is arranged through the clutch gear, the output gear, and the pusher, and the clutch gear, the output gear, and the pusher can rotate relative to the transmission shaft respectively.

In the above-mentioned bicycle mid-mounted motor transmission device, the clutch assembly further includes a mid-mounted bearing, which is arranged on the drive ring; and the drive ring further has an annular convex portion, which is protruded on one end surface of the drive ring and surrounds the rotation center of the drive ring. The drive ring is passed through the mid-mounted bearing through the annular convex portion, thereby rotating relative to the mid-mounted bearing.

In the mid-mounted motor transmission device of the bicycle as described above, the clutch gear protrudes toward the output gear to form a first joint portion, and the first toothed portions are located on a side of the first joint portion facing the output gear; and the output gear protrudes toward the clutch gear to form a second joint portion, and the second toothed portions are located on a side of the second joint portion facing the clutch gear.

In the mid-mounted motor transmission device of the bicycle as described above, the first sliding part is a groove, the depression of which is formed on the inner bottom surface, the first sliding part has a groove bottom surface, and the groove bottom surface is inclined relative to the inner bottom surface; and the second sliding part is a convex block, the second sliding part is inside the first sliding part and contacts the groove bottom surface, and the second sliding part can slide along the groove bottom surface.

As mentioned above, in the mid-mounted motor transmission device of the bicycle, each of the first toothed parts and each of the second toothed parts are ratchets, and the shape of each of the second toothed parts corresponds to the shape of each of the first toothed parts.

In the above-mentioned mid-mounted motor transmission device of the bicycle, each of the first toothed parts includes a first tooth surface and a second tooth surface, the first tooth surface is connected to the second tooth surface, extends toward the output gear, and is inclined in the tangential direction of the rotation direction of the clutch gear.

In the mid-mounted motor transmission device of the bicycle as described above, the first abutment portion protrudes from one side of the clutch gear facing the push plate, and the second abutment portion protrudes from one side of the push plate facing the clutch gear, whereby the first abutment portion can push against the second abutment portion along the rotation direction of the clutch gear.

In the above-mentioned mid-mounted motor transmission device for a bicycle, the pusher further comprises a first magnetic member, which is arranged on the seat shell and located beside the opening.

In the above-mentioned mid-mounted motor transmission device for a bicycle, the push plate includes a material that can be attracted by magnetic force; and the pusher further has a second magnetic member, which is arranged on the inner bottom surface to attract the push plate.

First, please refer to FIG. 1 to FIG. 4 . The present invention proposes a mid-mounted motor transmission device for a bicycle, which includes a housing 10 , an output shaft 20 , a motor 30 , and a clutch assembly 40 .

The housing 10 has two opposite sides, and the output shaft 20 is disposed in the housing 10 and penetrates the two opposite sides of the housing 10. The output shaft 20 has a transmission tooth 21, which is protruding from the outer peripheral surface of the output shaft 20 and is located in the housing 10. In this embodiment, the transmission tooth 21 is a helical tooth, but it is not limited to this. The motor 30 is disposed in the housing 10. The clutch assembly 40 is disposed in the housing 10, and the clutch assembly 40 connects the output shaft 20 and the motor 30. In this embodiment, the motor 30 is connected to the clutch assembly 40 via a connecting gear set 31, and the connecting gear set 31 includes a plurality of helical gears, but is not limited thereto.

4 to 7 , the clutch assembly 40 includes a drive ring 41 , a clutch gear 42 , an output gear 43 , a pusher 44 , a transmission shaft 45 , and a center bearing 46 .

As shown in FIG. 4 to FIG. 8 , the driving ring 41 is connected to the motor 30 and is thereby driven to rotate by the motor 30 . The driving ring 41 has an outer ring tooth portion 411 , an inner ring tooth portion 412 , and an annular protrusion 413 .

The outer ring teeth 411 are formed on the outer circumference of the driving ring 41, and the connecting gear set 31 of the motor 30 is connected to the outer ring teeth 411. The inner ring teeth 412 are formed on the inner circumference of the driving ring 41. In this embodiment, the driving ring 41 has two opposite end faces, and the annular protrusion 413 is protrudingly formed on one of the end faces and surrounds the rotation center of the driving ring 41, but it is not limited to this. In other embodiments, the driving ring 41 may not have the annular protrusion 413.

Next, please refer to FIG. 6 to FIG. 8 , FIG. 11 , and FIG. 12 , the clutch gear 42 is disposed in the driving ring 41 and can move relative to the driving ring 41 along the axial direction of the driving ring 41. In this embodiment, the clutch gear 42 includes a material that can be attracted by magnetism, but is not limited thereto. The clutch gear 42 has a clutch ring tooth portion 421, a plurality of first tooth portions 422, a first engaging portion 423, and a first abutting portion 424.

The clutch ring gear 421 is formed on the outer peripheral surface of the clutch gear 42 and meshes with the inner ring gear 412 of the driving ring 41, so that the driving ring 41 drives the clutch gear 42 to rotate. In this embodiment, the clutch ring gear 421 is a helical gear, but it is not limited to this. The clutch gear 42 has two opposite end faces in the axial direction, and the first toothed portion 422 is formed on one end face facing the output gear 43. Specifically, the clutch gear 42 in this embodiment protrudes toward the output gear 43 to form a first engaging portion 423, and the side of the first engaging portion 423 facing the output gear 43 is the end face of the clutch gear 42 facing the output gear 43, and the first toothing portion 422 is formed on the side of the first engaging portion 423 facing the output gear 43.

The first toothed parts 422 surround the rotation center of the clutch gear 42, and the first toothed parts 422 are connected to each other. In this embodiment, as shown in FIG. 12, each first toothed part 422 is a ratchet and has a first tooth surface 4221 and a second tooth surface 4222. The first tooth surface 4221 is connected to the second tooth surface 4222, and extends toward the output gear 43 and is inclined in the tangential direction of the rotation direction of the clutch gear 42.

The first abutment portion 424 is protruded from the other end surface of the clutch gear 42 facing the pusher 44. In this embodiment, the first abutment portion 424 includes a plurality of ridges extending along the radial direction of the clutch gear 42. The plurality of ridges are arranged at intervals along the circumferential direction of the clutch gear 42, but the present invention is not limited thereto. The form of the first abutment portion 424 can be adjusted as needed.

In addition, in the present embodiment, an extension portion 425 is formed on a side of the clutch gear 42 facing the pusher 44, and the extension portion 425 surrounds the rotation center of the clutch gear 42, and the first abutment portion 424 is located on the extension portion 425, but this is not limited to this. In other embodiments, the clutch gear 42 may not have the extension portion 425.

Next, please refer to Figures 4 to 7 and 12. The output gear 43 is connected to the output shaft 20 and can drive the output shaft 20 to rotate. The output gear 43 and the clutch gear 42 are detachably connected to each other, whereby the clutch gear 42 selectively drives the output gear 43 to rotate. The output gear 43 has an output ring tooth portion 431, a plurality of second tooth portions 432, and a second engagement portion 433.

The output ring gear 431 is formed on the outer peripheral surface of the output gear 43 and meshes with the driving gear 21 of the output shaft 20. In this embodiment, the output ring gear 431 is a helical gear, but it is not limited to this. The output gear 43 has two opposite end surfaces in the axial direction, and the second toothed portion 432 is formed on one end surface of the output gear 43 facing the clutch gear 42. Specifically, the output gear 43 protrudes toward the clutch gear 42 to form a second engaging portion 433, and the side of the second engaging portion 433 facing the clutch gear 42 is the end face of the output gear 43 facing the clutch gear 42, and the second toothing portion 432 is located on the side of the second engaging portion 433 facing the clutch gear 42.

The second toothed portion 432 surrounds the rotation center of the output gear 43, and the second toothed portions 432 are connected to each other. The second toothed portion 432 and the first toothed portion 422 selectively engage with each other. Specifically, in this embodiment, each second toothed portion 432 is a ratchet, and the shape of each second toothed portion 432 corresponds to the shape of the first toothed portion 422, but the present invention is not limited thereto.

6 to 8 and 11 , the pusher 44 is located on a side of the clutch gear 42 opposite to the output gear 43 . The pusher 44 is magnetic and includes a housing 441 , a push plate 442 , an elastic member 443 , a first magnetic member 444 , and a second magnetic member 445 .

The housing 441 surrounds a setting space 4411 and has an opening 4412, which is connected to the setting space 4411 and faces the clutch gear 42. The housing 441 further has an inner bottom surface 4413 and a first sliding portion 4414, the inner bottom surface 4413 is located in the setting space 4411 and faces the opening 4412, and the first sliding portion 4414 is formed on the inner bottom surface 4413. In the present embodiment, the inner bottom surface 4413 is formed with a plurality of first sliding portions 4414, and the plurality of first sliding portions 4414 are arranged at intervals along the circumferential direction of the inner bottom surface 4413; each first sliding portion 4414 is a groove and is recessed in the inner bottom surface 4413, and each first sliding portion 4414 has a groove bottom surface 4415, and the groove bottom surface 4415 is inclined relative to the inner bottom surface 4413. Specifically, the groove bottom surface 4415 is inclined toward the clutch gear 42 along the rotation direction of the clutch gear 42, but this is not limited to this. In other embodiments, the first sliding portion 4414 may not be a groove.

The push disk 442 is located in the setting space 4411 and can move along the axial direction of the housing 441. In this embodiment, the push disk 442 is a disk and includes a material that can be attracted by magnetic force, but it is not limited to this. The form of the push disk 442 can be adjusted according to needs. The push disk 442 has a second abutment portion 4421 and a second sliding portion 4422.

The second abutment portion 4421 is formed on the side of the push disk 442 facing the opening 4412, and the second abutment portion 4421 can be detachably abutted against the first abutment portion 424, so that the clutch gear 42 can drive the push disk 442 to rotate. Specifically, in this embodiment, the second abutment portion 4421 includes a plurality of convex strips, each of which extends along the radial direction of the push disk 442 and is protrudingly formed on one side of the push disk 442 facing the clutch gear 42, and the plurality of convex strips are arranged at intervals along the circumferential direction of the push disk 442. Since the multiple protrusions of the first abutment portion 424 are formed on one side of the clutch gear 42 facing the push plate 442, when the push plate 442 and the clutch gear 42 contact each other, the first abutment portion 424 can push against the second abutment portion 4421 along the rotation direction of the clutch gear 42, thereby the clutch gear 42 drives the push plate 442 to rotate.

In addition, in this embodiment, the clutch gear 42 is penetrated through the opening 4412 of the housing 441 by the extension portion 425 , so that the clutch gear 42 can detachably contact the push plate 442 , and further allow the first abutting portion 424 to abut against the second abutting portion 4421 .

The second sliding portion 4422 is formed on one side of the push plate 442 facing the inner bottom surface 4413 and can slide relative to the first sliding portion 4414. In this embodiment, the push plate 442 has a plurality of second sliding portions 4422, and the number and position of the second sliding portions 4422 correspond to the number and position of the first sliding portions 4414. Each second sliding portion 4422 is a convex block and is located in the groove of the first sliding portion 4414, and each second sliding portion 4422 contacts the groove bottom surface 4415 of the first sliding portion 4414 and can slide along the groove bottom surface 4415.

The elastic member 443 is located in the setting space 4411 , and the elastic member 443 abuts against the push disk 442 and the periphery of the opening 4412 of the housing 441 , whereby the elastic member 443 tends to push the push disk 442 toward the inner bottom surface 4413 .

In this embodiment, the pusher 44 has a first magnetic member 444, which is disposed on the housing 441 and is located next to the opening 4412. Specifically, the pusher 44 has a plurality of first magnetic members 444, which are disposed at intervals along the circumference of the opening 4412. The first magnetic members 444 are used to provide magnetism to the pusher 44, thereby attracting the clutch gear 42 to move toward the pusher 44. Similarly, the pusher 44 has a plurality of second magnetic members 445, which are disposed at intervals on the inner bottom surface 4413 along the circumferential direction of the inner bottom surface 4413, thereby attracting the push disk 442 to move toward the inner bottom surface 4413, but the present invention is not limited thereto.

5 to 7 , the clutch assembly 40 in this embodiment may further include a transmission shaft 45. The transmission shaft 45 is disposed through the clutch gear 42, the output gear 43, and the pusher 44, and the clutch gear 42, the output gear 43, and the pusher 44 can rotate relative to the transmission shaft 45. Specifically, the clutch gear 42, the output gear 43, and the push plate 442 in the pusher 44 in this embodiment are coaxially arranged, and the transmission shaft 45 is arranged through the clutch gear 42, the output gear 43, and the rotation center position of the push plate 442, thereby stabilizing the relative positions of the clutch gear 42, the output gear 43, and the push plate 442 to avoid deviation during operation, but not limited to this. In other embodiments, the transmission shaft 45 may not be provided.

In addition, the present embodiment may further include a center bearing 46 disposed on the driving ring 41. Specifically, the center bearing 46 is sleeved on the annular protrusion 413 of the driving ring 41 to assist the driving ring 41 in rotating to avoid deviation. However, this is not limited to this. In other embodiments, the center bearing 46 may not be included.

Next, please refer to FIG. 8 to FIG. 12 . When the motor 30 is not started, as shown in FIG. 8 , the clutch gear 42 is attracted by the first magnetic member 444 and separated from the output gear 43 and abuts against the push plate 442. The push plate 442 is pushed by the elastic member 443 and abuts against the inner bottom surface 4413, and the second sliding portion 4422 is located in the first sliding portion 4414.

When the motor 30 is started, as shown in FIG9 and FIG11 , the motor 30 drives the driving ring 41 to rotate via the outer ring gear 411, and the driving ring 41 is penetrated through the middle bearing 46 via the annular protrusion 413, thereby rotating relative to the middle bearing 46 to avoid deviation. Furthermore, the driving ring 41 drives the clutch gear 42 to rotate via the inner ring gear 412, and the first abutting portion 424 of the clutch gear 42 pushes against the second abutting portion 4421 of the push plate 442, so that the push plate 442 also starts to rotate. While the push plate 442 rotates, the second sliding portion 4422 slides along the groove bottom surface 4415 of the first sliding portion 4414, and then the push plate 442 moves toward the opening 4412 of the housing 441, and further pushes the clutch gear 42 to move toward the output gear 43, until the first toothed portion 422 contacts the second toothed portion 432 and engages with each other as shown in FIG. 12, whereby the clutch gear 42 drives the output gear 43 to rotate, and the output gear 43 engages the transmission gear 21 through the output ring tooth portion 431 and drives the output shaft 20 to rotate, so that the power of the motor 30 is transmitted to the output shaft 20, and the rider is assisted in pedaling.

In this process, since the first tooth surface 4221 and the second tooth surface 4222 of each first tooth portion 422 are inclined in the tangential direction of the rotation direction of the clutch gear 42, when the first tooth portion 422 contacts and engages with the second tooth portion 432, the clutch gear 42 will be further displaced in the direction of the output gear 43, causing the clutch gear 42 to no longer contact the push plate 442. At this time, the elastic member 443 and the second magnetic member 445 will reset the push plate 442 to the state before the motor 30 is started, presenting a situation as shown in Figure 10.

When the motor 30 is powered off or other reasons cause the rotation speed of the clutch gear 42 to be less than the rotation speed of the output gear 43, since the first tooth surface 4221 and the second tooth surface 4222 of each first tooth portion 422 are inclined in the tangential direction of the rotation direction of the clutch gear 42, the first tooth portion 422 will separate from the second tooth portion 432 and no longer engage with each other; in addition, since the first tooth surface 4221 is inclined, when the clutch gear 42 and the output gear 43 begin to separate, the tip of the second tooth portion 432 will slightly push the clutch gear 42 toward the direction of the pusher 44 along the first tooth surface 4221, so that the clutch gear 42 and the output gear 43 are completely separated. On the contrary, as long as the rotation speed of the output gear 43 is not greater than the rotation speed of the clutch gear 42, when the first toothed portion 422 and the second toothed portion 432 are engaged with each other, the clutch gear 42 will not separate from the output gear 43 and can continue to transmit the power of the motor 30 to the output gear 43.

After the clutch gear 42 and the output gear 43 are separated from each other, the first magnetic member 444 on the pusher 44 attracts the clutch gear 42, so the clutch gear 42 moves toward the pusher 44 and returns to the state before the motor 30 is started as shown in FIG. 8 .

The mid-motor transmission device of the bicycle of the present invention can push the clutch gear 42 to engage with the output gear 43 through the push plate 442 in the pusher 44 when the motor 30 starts to output power, and then the push plate 442 can be immediately separated and reset.

When the motor 30 stops outputting power, the clutch gear 42 can be completely separated from the output gear 43, and there will be no continuous contact to cause wear of the first toothed portion 422 and the second toothed portion 432. In addition, since the clutch gear 42 can be completely separated from the output gear 43, when the rider steps on the pedal, it is not necessary to drive the motor 30 to rotate in reverse, which can reduce the rider's physical consumption, reduce the wear of the mechanism of the invention, and extend the service life.

In addition, through the arrangement of the transmission shaft 45, the output gear 43, the clutch gear 42, and the push plate 442 can be accurately and precisely arranged on the same shaft without deviation; in conjunction with the arrangement of the center bearing 46, the deviation of the drive ring 41 and the clutch gear 42 during the clutch operation can be reduced, thereby improving the smoothness and stability of the clutch. Even when the rider's pedaling causes continuous vibration to the center motor, the clutch assembly 40 can still be stably engaged, making the overall structure of the clutch assembly 40 more compact.

The invention forms an active-on-the-outer-passive-on-the-inner design by cooperating the drive ring 41 and the clutch gear 42, which can adapt to the compact space inside the center motor. Similarly, the design of the first joint portion 423 of the clutch gear 42 and the second joint portion 433 of the output gear 43 can not only structurally maintain the actuation strength of the clutch gear 42 and the output gear 43, but also reduce the length of the clutch gear 42 required to be displaced, so that they are connected to each other in a compact space, further reducing the axial length of the drive ring 41 and the overall volume of the drive ring 41 to adapt to the compact space inside the center motor.

In summary, the clutch assembly 40 of the invention has a compact structure, so it can be installed in the small and limited space of the central motor and operate smoothly without being affected by the rider's pedaling and causing deviation. In addition, the invention can completely separate the clutch gear 42 and the output gear 43, so when the motor 30 stops outputting power, the rider does not need to expend extra energy to drive the motor 30 to rotate in the reverse direction, which reduces energy consumption and avoids the wear of the clutch gear 42 and the output gear 43.

10: housing 20: output shaft 21: transmission gear 30: motor 31: connecting gear set 40: clutch assembly 41: drive ring 411: outer ring gear 412: inner ring gear 413: annular convex portion 42: clutch gear 421: clutch ring gear 422: first toothing portion 4221: first tooth surface 4222: second tooth surface 423: first engagement portion 424: first abutment portion 425: extension portion 43: output gear 431: output ring gear 432: second toothing portion 433: Second joint part 44: Pusher 441: Housing 4411: Setting space 4412: Opening 4413: Inner bottom surface 4414: First sliding part 4415: Groove bottom surface 442: Push plate 4421: Second abutment part 4422: Second sliding part 443: Elastic member 444: First magnetic member 445: Second magnetic member 45: Transmission shaft 46: Center bearing

Figure 1 is a schematic diagram of the appearance of the present invention. Figure 2 is a schematic diagram of the appearance of the present invention after removing the outer shell. Figure 3 is a schematic diagram of the top view of the present invention after removing the outer shell. Figure 4 is a schematic diagram of the decomposition of the present invention. Figure 5 is a schematic diagram of the appearance of the clutch assembly of the present invention. Figure 6 is a schematic diagram of the decomposition of the clutch assembly of the present invention. Figure 7 is a schematic diagram of the decomposition of the clutch assembly of the present invention from another angle. Figures 8 to 10 are schematic diagrams of the action of the clutch assembly of the present invention. Figure 11 is a partially enlarged schematic diagram of the clutch assembly of the present invention, which shows that the first abutting portion and the second abutting portion abut against each other. Figure 12 is a partially enlarged schematic diagram of the clutch assembly of the present invention, which shows that the first toothing portion and the second toothing portion are engaged with each other.

20: Output shaft

30: Motor

40: Clutch assembly

Claims (10)

A mid-mounted motor transmission device for a bicycle comprises: an outer casing having two opposite surfaces; an output shaft penetrating the two opposite surfaces of the outer casing, the output shaft having: a transmission tooth portion protruding from the outer peripheral surface of the output shaft; a motor disposed in the outer casing; and a clutch assembly disposed in the outer casing and connecting the output shaft and the motor, the clutch assembly comprising: a drive ring connected to the motor and driven to rotate by the motor, the drive ring having: an outer ring tooth portion formed on the outer peripheral surface of the drive ring, the motor being connected to the outer ring tooth portion; and An inner ring tooth portion formed on the inner circumference of the driving ring; A clutch gear disposed in the driving ring and capable of moving along the axial direction of the driving ring, the clutch gear comprising a material that can be attracted by magnetism; the clutch gear comprises: A clutch ring tooth portion formed on the outer circumference of the clutch gear and meshing with the inner ring tooth portion of the driving ring; A plurality of first tooth portions formed on one end face of the clutch gear, the first tooth portions surround the rotation center of the clutch gear and the first tooth portions are connected to each other; and A first abutment portion formed on the other end face of the clutch gear; An output gear connected to the output shaft and capable of driving the output shaft to rotate, the output gear and the clutch gear are detachably connected to each other; the output gear has: An output annular tooth portion formed on the outer peripheral surface of the output gear and meshing with the driving tooth portion of the output shaft; A plurality of second tooth portions formed on one end face of the output gear facing the clutch gear, the second tooth portions surround the rotation center of the output gear, and the second tooth portions are connected to each other, and the second tooth portions selectively mesh with the first tooth portions; and A pusher is located on a side of the clutch gear opposite to the output gear, the pusher is magnetic, and the pusher includes: A housing, which surrounds a setting space and forms an opening, the opening is connected to the setting space, and the opening faces the clutch gear, the housing has: An inner bottom surface, which is located in the setting space and faces the opening; and A first sliding portion, which is formed on the inner bottom surface; A push plate, which is located in the setting space and can move along the axial direction of the housing, and the push plate has: A second abutment portion is formed on a side of the push disk facing the opening, and the second abutment portion and the first abutment portion can be detachably abutted against each other, whereby the clutch gear drives the push disk to rotate; and A second sliding portion is formed on a side of the push disk facing the inner bottom surface and can slide relative to the first sliding portion; and An elastic member is located in the setting space, and the elastic member abuts against the push disk and the periphery of the opening of the housing. The mid-mounted motor transmission device of the bicycle as described in claim 1, wherein the clutch assembly further comprises: A transmission shaft, which is disposed through the clutch gear, the output gear, and the pusher, and the clutch gear, the output gear, and the pusher can rotate relative to the transmission shaft. The mid-mounted motor transmission device of a bicycle as described in claim 1, wherein the clutch assembly further comprises: a mid-mounted bearing disposed on the drive ring; and the drive ring further comprises: an annular protrusion formed on one end surface of the drive ring and surrounding the rotation center of the drive ring, the drive ring is passed through the mid-mounted bearing via the annular protrusion, thereby rotating relative to the mid-mounted bearing. A mid-mounted motor transmission device for a bicycle as described in claim 1, wherein: The clutch gear protrudes toward the output gear to form a first joint portion, and the first toothed portions are located on a side of the first joint portion facing the output gear; and The output gear protrudes toward the clutch gear to form a second joint portion, and the second toothed portions are located on a side of the second joint portion facing the clutch gear. A mid-mounted motor transmission device for a bicycle as described in any one of claims 1 to 4, wherein: The first sliding portion is a groove, the depression of which is formed in the inner bottom surface, the first sliding portion has a groove bottom surface, and the groove bottom surface is inclined relative to the inner bottom surface; and The second sliding portion is a convex block, the second sliding portion is located in the first sliding portion and contacts the groove bottom surface, and the second sliding portion can slide along the groove bottom surface. A mid-mounted motor transmission device for a bicycle as described in any one of claims 1 to 4, wherein each of the first tooth portions and each of the second tooth portions are ratchets, and the shape of each of the second tooth portions corresponds to the shape of each of the first tooth portions. The mid-mounted motor transmission device of a bicycle as described in claim 6, wherein each of the first toothed parts comprises: a first tooth surface and a second tooth surface, the first tooth surface is connected to the second tooth surface, extends toward the direction of the output gear, and is inclined in the tangential direction of the rotation direction of the clutch gear. A mid-mounted motor transmission device for a bicycle as described in any one of claims 1 to 4, wherein: The first abutment portion protrudes from one side of the clutch gear facing the push plate, and the second abutment portion protrudes from one side of the push plate facing the clutch gear, whereby the first abutment portion can push against the second abutment portion along the rotation direction of the clutch gear. A mid-mounted motor transmission device for a bicycle as described in any one of claims 1 to 4, wherein the pusher further comprises: A first magnetic member disposed on the seat shell and located next to the opening. A mid-mounted motor transmission device for a bicycle as described in any one of claims 1 to 4, wherein: the push plate comprises a material that can be attracted by magnetic force; and the pusher further has a second magnetic member disposed on the inner bottom surface to attract the push plate.

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