Middle motor transmission device of bicycle

Abstract

The invention provides a middle motor transmission device of a bicycle. The middle motor transmission device is provided with a shell, an output shaft, a motor and a clutch assembly. The clutch assembly is arranged in the shell and is provided with a driving ring, a clutch gear, an output gear and a pusher. The driving ring is connected to the motor. The clutch gear moves in the driving ring in the axial direction and is magnetically attracted. The output gear is connected to the output shaft and detachably connected with the clutch gear. The pusher is located on one side of the clutch gear and has magnetism. The pusher is provided with a seat shell, a pushing disc and an elastic piece. The pushing disc moves in the base shell in the axial direction, and the elastic piece abuts against the pushing disc and the base shell. The clutch gear can drive the pushing disc to rotate so as to push the pushing disc to be meshed with the output gear, and the elastic piece and the pusher can reset the pushing disc. And after the clutch gear is separated from the output gear, the pusher can reset the clutch gear.

Description

Technical Field

[0001] The present invention relates to a transmission device, in particular to a mid-motor transmission device for a bicycle. Background Art

[0002] Due to the promotion of leisure life and the improvement of environmental awareness, the number of people riding bicycles has increased, and the areas of use are becoming more and more extensive. However, for some riders in areas with steep terrain, those who need to ride long distances, or those who simply lack physical strength, riding a bicycle may be more difficult. Therefore, in addition to the common human-powered bicycle, which is entirely pedaled, electric-assisted bicycles have also been developed to allow riders to save physical energy.

[0003] Most electric-assisted bicycles utilize a motor mounted on the bicycle to deliver power to the rider. Among these, a mid-drive unit (MID-DRY) motor is so named because it is not mounted on the front or rear wheel but rather on the bicycle's center axle (also known as the bottom bracket axle). This motor delivers power to the bicycle's center axle, saving the rider the effort of pedaling.

[0004] However, due to regulatory restrictions, mid-mounted motors have a maximum speed limit. If the bicycle reaches the legal limit, the motor must shut down and cease power. However, if the mid-mounted motor's transmission remains engaged, the driven mechanism must in turn drive the active mechanism, consuming the rider's energy. Therefore, a clutch mechanism is needed to separate the active and driven mechanisms when the motor is powered off, thus reducing wear on the transmission components.

[0005] Furthermore, since the mid-mounted motor is located at the bicycle's center axle, it must constantly withstand the rider's pedaling vibrations. Furthermore, most mid-mounted motors require a multi-speed reduction gearbox, creating a very compact and narrow space. Therefore, how to install a clutch mechanism within the narrow space of the mid-mounted motor and ensure stable clutch engagement under the constant pedaling vibrations remains a topic that requires further consideration and research and development. Summary of the Invention

[0006] The main purpose of the present invention is to provide a mid-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.

[0007] To achieve the above objectives, the present invention provides a mid-mounted motor transmission device for a bicycle, comprising:

[0008] a housing having two opposing sides;

[0009] An output shaft passes through two opposite sides of the housing, the output shaft having:

[0010] a transmission tooth portion protruding from the outer circumference of the output shaft;

[0011] a motor disposed in the housing; and

[0012] A clutch assembly is disposed in the housing and connects the output shaft to the motor, the clutch assembly comprising:

[0013] A drive ring connected to the motor so as to be driven to rotate by the motor, the drive ring having:

[0014] an outer ring gear portion formed on the outer circumference of the drive ring, the motor being connected to the outer ring gear portion; and

[0015] an inner ring tooth portion formed on the inner circumference of the drive ring;

[0016] A clutch gear is arranged in the driving ring and can move along the axial direction of the driving ring.

[0017] The clutch gear comprises a magnetically attractable material; the clutch gear has:

[0018] a clutch ring tooth portion formed on the outer peripheral surface of the clutch gear and meshing with the inner ring tooth portion of the drive ring;

[0019] a plurality of first cogwheel portions formed on one end surface of the clutch gear, the first cogwheel portions surrounding the rotation center of the clutch gear and the first cogwheel portions being connected to each other; and

[0020] a first abutting portion formed on the other end surface of the clutch gear;

[0021] an output gear connected to the output shaft and capable of driving the output shaft to rotate, the output gear and the clutch gear being detachably connected to each other; the output gear having:

[0022] an output ring tooth portion formed on the outer peripheral surface of the output gear and meshing with the transmission tooth portion of the output shaft;

[0023] a plurality of second cogwheel portions formed on an end surface of the output gear facing the clutch gear, the second cogwheel portions surrounding the rotation center of the output gear and connected to each other, and the second cogwheel portions selectively engage with the first cogwheel portions;

[0024] as well as

[0025] A pusher is located on the side of the clutch gear relative to the output gear.

[0026] Magnetic, and the pusher contains:

[0027] A housing is formed around a setting space and has an opening, the opening is connected to the setting space and faces the clutch gear, and the housing has:

[0028] an inner bottom surface located in the setting space and facing the opening; and a first sliding portion formed on the inner bottom surface;

[0029] A push plate is located in the setting space and can move along the axial direction of the seat shell, and the push plate has:

[0030] a second abutting portion formed on a surface of the push plate facing the opening, the second abutting portion and the first abutting portion being separably abutted against each other, whereby the clutch gear drives the push plate to rotate; and

[0031] 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

[0032] An elastic member is located in the setting space, and the elastic member abuts against the pushing plate and the periphery of the opening of the seat shell.

[0033] Therefore, the advantage of the present 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 avoiding 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.

[0034] As described above, the mid-mounted motor transmission device for a bicycle, wherein 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.

[0035] As described above, the mid-mounted motor transmission device for a bicycle, wherein the clutch assembly further includes a mid-mounted bearing, which is disposed on the drive ring; and the drive ring further has an annular protrusion, which protrudes from 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 via the annular protrusion, thereby rotating relative to the mid-mounted bearing.

[0036] In the aforementioned mid-mounted motor transmission device for a bicycle, the clutch gear protrudes toward the output gear to form a first engaging portion, and the first cogwheel portion is located on a side of the first engaging portion facing the output gear; and the output gear protrudes toward the clutch gear to form a second engaging portion, and the second cogwheel portion is located on a side of the second engaging portion facing the clutch gear.

[0037] As described above, the mid-mounted motor transmission device for a bicycle, wherein the first sliding portion is a groove, which is formed in the inner bottom surface, and the first sliding portion has a groove bottom surface, which is inclined relative to the inner bottom surface; and the second sliding portion is a protrusion, which 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.

[0038] In the aforementioned mid-mounted motor transmission device for a bicycle, each of the first cogwheel portions and each of the second cogwheel portions are ratchets, and the shape of each of the second cogwheel portions corresponds to the shape of each of the first cogwheel portions.

[0039] In the aforementioned mid-mounted motor transmission device for a bicycle, each of the first cogwheel portions includes a first tooth surface and a second tooth surface, wherein the first tooth surface is connected to the second tooth surface, extends toward the output gear, and is inclined in a tangential direction to the rotation direction of the clutch gear.

[0040] As described above, the mid-mounted motor transmission device of the bicycle, wherein the first abutment portion protrudes from the side of the clutch gear facing the push plate, and the second abutment portion protrudes from the 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.

[0041] In the aforementioned mid-mounted motor transmission device for a bicycle, the pusher further comprises a first magnetic member, which is disposed on the seat shell and located beside the opening.

[0042] In the aforementioned mid-mounted motor transmission device for a bicycle, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the appearance of the present invention.

[0044] Figure 2 This is a schematic diagram of the appearance of the present invention after removing the outer shell.

[0045] Figure 3 It is a top view schematic diagram of the present invention with the outer shell removed.

[0046] Figure 4It is a schematic diagram of the decomposition of the present invention.

[0047] Figure 5 Schematic diagram of the appearance of the clutch assembly of the present invention.

[0048] Figure 6 It is an exploded schematic diagram of the clutch assembly of the present invention.

[0049] Figure 7 It is a schematic exploded view from another angle of the clutch assembly of the present invention.

[0050] Figures 8 to 10 Schematic diagram of the clutch assembly of the present invention.

[0051] Figure 11 It 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.

[0052] Figure 12 It is a partially enlarged schematic diagram of the clutch assembly of the present invention, showing the first cogwheel portion and the second cogwheel portion engaging with each other. DETAILED DESCRIPTION

[0053] First, please refer to Figures 1 to 4 The present invention provides 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 .

[0054] The housing 10 has two opposing surfaces, and the output shaft 20 is disposed in the housing 10 and extends through the two opposing surfaces of the housing 10. The output shaft 20 has a transmission tooth portion 21, which is protruding from the outer circumference of the output shaft 20 and is located within the housing 10. In this embodiment, the transmission tooth portion 21 is a helical tooth, but the present invention is not limited thereto. The motor 30 is disposed within the housing 10. The clutch assembly 40 is disposed within 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 the present invention is not limited thereto.

[0055] Please refer to Figures 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 central bearing 46 .

[0056] like Figures 4 to 8 As shown, 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 a ring protrusion 413.

[0057] An outer ring gear portion 411 is formed on the outer circumference of the drive ring 41, and the connecting gear set 31 of the motor 30 is connected to the outer ring gear portion 411. An inner ring gear portion 412 is formed on the inner circumference of the drive ring 41. In this embodiment, the drive ring 41 has two opposing end surfaces, and the annular protrusion 413 is formed protruding from one end surface and surrounds the rotation center of the drive ring 41. However, this is not limiting. In other embodiments, the drive ring 41 may not have the annular protrusion 413.

[0058] Please refer to Figures 6 to 8 、 Figure 11 ,and Figure 12 The clutch gear 42 is disposed within the drive ring 41 and is movable relative to the drive ring 41 along the axial direction of the drive ring 41. In this embodiment, the clutch gear 42 comprises a magnetically attractable material, but the present invention is not limited thereto. The clutch gear 42 comprises a clutch ring tooth portion 421, a plurality of first cog portions 422, a first engaging portion 423, and a first abutting portion 424.

[0059] The clutch ring teeth 421 are formed on the outer circumference of the clutch gear 42 and mesh with the inner ring teeth 412 of the drive ring 41, thereby driving the clutch gear 42 to rotate. In this embodiment, the clutch ring teeth 421 are helical teeth, but this is not limiting. The clutch gear 42 has two opposing end surfaces in the axial direction, and the first cogwheel portion 422 is formed on one end surface facing the output gear 43. Specifically, in this embodiment, the clutch gear 42 protrudes toward the output gear 43 to form a first engaging portion 423. The surface of the first engaging portion 423 facing the output gear 43 is the end surface of the clutch gear 42 facing the output gear 43, and the first cogwheel portion 422 is formed on the surface of the first engaging portion 423 facing the output gear 43.

[0060] The first cogwheel portions 422 surround the rotation center of the clutch gear 42, and the first cogwheel portions 422 are connected to each other. Figure 12 As shown, each first cog portion 422 is a ratchet tooth having a first tooth surface 4221 and a second tooth surface 4222 . The first tooth surface 4221 is connected to the second tooth surface 4222 , extends toward the output gear 43 , and is inclined tangentially to the rotation direction of the clutch gear 42 .

[0061] The first abutment portion 424 protrudes 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 protrusions extending in the radial direction of the clutch gear 42. The plurality of protrusions are arranged at intervals along the circumferential direction of the clutch gear 42, but the present invention is not limited to this. The shape of the first abutment portion 424 can be adjusted according to needs.

[0062] Furthermore, in this embodiment, an extension portion 425 is formed on a surface of the clutch gear 42 that protrudes toward the pusher 44. 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. However, the present invention is not limited thereto. In other embodiments, the clutch gear 42 may not have the extension portion 425.

[0063] Please refer to Figures 4 to 7 and Figure 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 gear portion 431, a plurality of second cog portions 432, and a second engaging portion 433.

[0064] The output ring teeth 431 are formed on the outer circumference of the output gear 43 and mesh with the transmission teeth 21 of the output shaft 20. In this embodiment, the output ring teeth 431 are helical teeth, but this is not limiting. The output gear 43 has two opposing axial ends, and the second cogwheel portion 432 is formed on one end of the output gear 43 facing the clutch gear 42. Specifically, the output gear 43 projects toward the clutch gear 42 to form a second engagement portion 433. The side of the second engagement portion 433 facing the clutch gear 42 is the end face of the output gear 43 facing the clutch gear 42, and the second cogwheel portion 432 is located on the side of the second engagement portion 433 facing the clutch gear 42.

[0065] The second cogwheel portions 432 surround the rotation center of the output gear 43 and are interconnected. The second cogwheel portions 432 selectively engage with the first cogwheel portions 422. Specifically, in this embodiment, each second cogwheel portion 432 is a ratchet tooth, and the shape of each second cogwheel portion 432 corresponds to the shape of the first cogwheel portion 422, but this is not limiting.

[0066] Please refer to Figures 6 to 8 and Figure 11 The pusher 44 is located on the 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.

[0067] The housing 441 surrounds a space 4411 and has an opening 4412 formed therein. The opening 4412 communicates with the 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 within the space 4411 and faces the opening 4412. The first sliding portion 4414 is formed on the inner bottom surface 4413. In this 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.

[0068] The push plate 442 is located in the space 4411 and is movable along the axial direction of the housing 441. In this embodiment, the push plate 442 is a circular disk made of a magnetically attractable material, but the present invention is not limited thereto. The shape of the push plate 442 can be adjusted as needed. The push plate 442 has a second abutting portion 4421 and a second sliding portion 4422.

[0069] The second abutment portion 4421 is formed on the side of the push plate 442 facing the opening 4412, and the second abutment portion 4421 can detachably abut against the first abutment portion 424, thereby driving the clutch gear 42 to rotate the push plate 442. Specifically, in this embodiment, the second abutment portion 4421 includes a plurality of protrusions, each of which extends in a radial direction of the push plate 442 and protrudes from the side of the push plate 442 facing the clutch gear 42. The plurality of protrusions are spaced apart along the circumferential direction of the push plate 442. Because the plurality of protrusions of the first abutment portion 424 protrude from the 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 in the rotational direction of the clutch gear 42, thereby driving the push plate 442 to rotate.

[0070] In addition, in this embodiment, the clutch gear 42 extends through the opening 4412 of the base housing 441 through the extension portion 425 , thereby allowing the clutch gear 42 to detachably contact the push plate 442 and further allow the first abutting portion 424 to abut against the second abutting portion 4421 .

[0071] The second sliding portion 4422 is formed on the side of the push plate 442 facing the inner bottom surface 4413 and is capable of sliding relative to the first sliding portion 4414. In this embodiment, the push plate 442 has multiple 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 protrusion and is located within a groove in the first sliding portion 4414. Each second sliding portion 4422 contacts the groove bottom surface 4415 of the first sliding portion 4414 and is capable of sliding along the groove bottom surface 4415.

[0072] The elastic member 443 is located in the setting space 4411 and abuts against the pushing plate 442 and the periphery of the opening 4412 of the seat shell 441 , thereby the elastic member 443 tends to push the pushing plate 442 toward the inner bottom surface 4413 .

[0073] In this embodiment, the pusher 44 has a first magnetic member 444 disposed on the base housing 441 and adjacent to the opening 4412. Specifically, the pusher 44 has a plurality of first magnetic members 444 spaced along the periphery of the opening 4412. The first magnetic members 444 provide magnetic properties to the pusher 44, thereby attracting the clutch gear 42 toward the pusher 44. Similarly, the pusher 44 has a plurality of second magnetic members 445 spaced along the circumference of the inner bottom surface 4413, thereby attracting the push plate 442 toward the inner bottom surface 4413, but the present invention is not limited thereto.

[0074] Please refer to Figures 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. The clutch gear 42, the output gear 43, and the pusher 44 are each capable of rotating relative to the transmission shaft 45. Specifically, in this embodiment, the clutch gear 42, the output gear 43, and the pusher plate 442 of the pusher 44 are coaxially arranged, and the transmission shaft 45 is disposed through the clutch gear 42, the output gear 43, and the pusher plate 442 at the rotation center. This stabilizes the relative positions of the clutch gear 42, the output gear 43, and the pusher plate 442 to prevent displacement during operation. However, this is not limiting. In other embodiments, the transmission shaft 45 may not be provided.

[0075] In addition, this embodiment may further include a central bearing 46, which is disposed on the drive ring 41. Specifically, the central bearing 46 is sleeved on the annular protrusion 413 of the drive ring 41 to assist the drive ring 41 in rotating to avoid deviation. However, this is not limited to this. In other embodiments, the central bearing 46 may not be provided.

[0076] Please refer to Figures 8 to 12 , when the motor 30 is not started, as Figure 8As shown, 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.

[0077] When the motor 30 is started, Figure 9 and Figure 11 As shown, the motor 30 drives the drive ring 41 to rotate via the outer ring gear portion 411, and the drive ring 41 is passed through the central bearing 46 by the annular protrusion 413, thereby rotating relative to the central bearing 46 to avoid deviation. Furthermore, the drive ring 41 drives the clutch gear 42 to rotate via the inner ring gear portion 412, and the first abutment portion 424 of the clutch gear 42 pushes against the second abutment portion 4421 of the push plate 442, causing the push plate 442 to also start 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, thereby moving the push plate 442 toward the opening 4412 of the seat shell 441, and further pushing the clutch gear 42 toward the output gear 43, until the first cog portion 422 contacts the second cog portion 432 and as shown Figure 12 As shown in the figure, the clutch gear 42 drives the output gear 43 to rotate, and the output gear 43 engages the transmission gear portion 21 through the output ring gear 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 to assist the rider in pedaling.

[0078] In this case, since the first tooth surface 4221 and the second tooth surface 4222 of each first cog portion 422 are inclined in the tangential direction of the rotation direction of the clutch gear 42, when the first cog portion 422 contacts and engages with the second cog 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, and the result is as follows. Figure 10 The situation shown in .

[0079] When the motor 30 loses power or other factors cause the clutch gear 42's speed to fall below that of the output gear 43, the first cog 422 and second cog 432 are inclined tangentially to the clutch gear 42's rotational direction. Consequently, the first cog 422 and second cog 432 separate and cease interlocking. Furthermore, due to the inclination of the first cog 4221, as the clutch gear 42 and output gear 43 begin to separate, the tip of the second cog 432 slightly pushes the clutch gear 42 along the first cog 4221 toward the pusher 44, completely separating the clutch gear 42 and output gear 43. Conversely, as long as the output gear 43's speed is not greater than that of the clutch gear 42, the first cog 422 and second cog 432 engage, preventing the clutch gear 42 from separating from the output gear 43 and allowing the clutch gear 42 to continue transmitting power from the motor 30 to the output gear 43.

[0080] When 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 position as shown in FIG. Figure 8 As shown in FIG, the motor 30 is in a state before being started.

[0081] 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 by means of the pusher plate 442 in the pusher 44 when the motor 30 starts to output power, and then the pusher plate 442 can be immediately separated and reset.

[0082] When the motor 30 stops outputting power, the clutch gear 42 is completely separated from the output gear 43, eliminating the continuous contact that would cause wear on the first cog 422 and the second cog 432. Furthermore, since the clutch gear 42 is completely separated from the output gear 43, the rider does not need to drive the motor 30 in reverse when pedaling, which reduces the rider's physical exertion, reduces wear on the mechanism of the present invention, and extends its service life.

[0083] In addition, by disposing 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 rotating shaft without offset; in conjunction with the disposition of the central bearing 46, the deflection of the drive ring 41 and the clutch gear 42 during the clutch operation of the present invention can be reduced, thereby improving the smoothness and stability of the clutch. Even when the rider's pedaling causes continuous vibration to the central motor, the clutch assembly 40 can still be stably engaged and disengaged, making the overall structure of the clutch assembly 40 more compact.

[0084] The present invention utilizes the cooperation between the drive ring 41 and the clutch gear 42 to form an active-outer, passive-inner design, which can accommodate the compact space inside the mid-mounted motor. Similarly, the design of the first engaging portion 423 of the clutch gear 42 and the second engaging portion 433 of the output gear 43 not only structurally maintains the actuation strength of the clutch gear 42 and the output gear 43, but also reduces the required displacement length of the clutch gear 42, allowing them to connect with 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 accommodate the compact space inside the mid-mounted motor.

[0085] In summary, the clutch assembly 40 of the present invention is compact, allowing it to be installed in the limited space of a mid-mounted motor and operate smoothly without being affected by the rider's pedaling and causing deflection. Furthermore, the present invention completely disengages the clutch gear 42 and output gear 43. Therefore, when the motor 30 stops outputting power, the rider does not need to expend additional energy to reverse the rotation of the motor 30, thus reducing physical exertion and preventing wear on the clutch gear 42 and output gear 43.

[0086] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A mid-mounted motor transmission device for a bicycle, characterized in that: Include: a housing having two opposing sides; An output shaft passes through two opposite sides of the housing, the output shaft having: a transmission tooth portion protruding from the outer circumference of the output shaft; a motor disposed in the housing; and A clutch assembly is disposed in the housing and connects the output shaft to the motor, the clutch assembly comprising: A drive ring connected to the motor so as to be driven to rotate by the motor, the drive ring having: an outer ring gear portion formed on the outer circumference of the drive ring, the motor being connected to the outer ring gear portion; and an inner ring tooth portion formed on the inner circumference of the drive ring; a clutch gear disposed within the drive ring and movable along the axial direction of the drive ring, the clutch gear comprising a magnetically attractable material; the clutch gear comprising: a clutch ring tooth portion formed on the outer peripheral surface of the clutch gear and meshing with the inner ring tooth portion of the drive ring; a plurality of first cogwheel portions formed on one end surface of the clutch gear, the first cogwheel portions surrounding the rotation center of the clutch gear and the first cogwheel portions being connected to each other; and a first abutting portion formed on the other end surface 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 being detachably connected to each other; the output gear having: an output ring tooth portion formed on the outer peripheral surface of the output gear and meshing with the transmission tooth portion of the output shaft; a plurality of second cogwheel portions formed on an end surface of the output gear facing the clutch gear, the second cogwheel portions surrounding the rotation center of the output gear and connected to each other, and the second cogwheel portions selectively engage with the first cogwheel portions; and a pusher located on a side of the clutch gear opposite to the output gear, the pusher having magnetism and comprising: A housing is formed around a setting space and has an opening, the opening is connected to the setting space and faces the clutch gear, and the housing has: an inner bottom surface located in the arrangement space and facing the opening; and a first sliding portion formed on the inner bottom surface; A push plate is located in the setting space and can move along the axial direction of the seat shell, The push plate has: a second abutting portion formed on a side of the push plate facing the opening, the second abutting portion and the first abutting portion being separably 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 is located in the setting space, and the elastic member abuts against the pushing plate and the periphery of the opening of the seat shell.

2. The mid-mounted motor transmission device for a bicycle according to claim 1, wherein: The clutch assembly further comprises: A transmission shaft is provided through the clutch gear, the output gear and the pusher. The clutch gear, the output gear and the pusher can rotate relative to the transmission shaft respectively.

3. The mid-mounted motor transmission device for a bicycle according to claim 1, wherein: The clutch assembly further comprises: a central bearing disposed on the drive ring; and The drive ring further has: An annular convex portion is formed on one end surface of the driving ring and surrounds the rotation center of the driving ring. The driving ring is passed through the central bearing through the annular convex portion and rotates relative to the central bearing.

4. The mid-mounted motor transmission device for a bicycle according to claim 1, wherein: The clutch gear protrudes toward the output gear to form a first engaging portion, and the first cog portion is located on a side of the first engaging portion facing the output gear; and The output gear protrudes toward the clutch gear to form a second engaging portion, and the second cogging portion is located on a side of the second engaging portion that faces the clutch gear.

5. The mid-mounted motor transmission device for a bicycle according to any one of claims 1 to 4, characterized in that: The first sliding portion is a groove, 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, is located in the first sliding portion, and contacts the bottom surface of the groove. The second sliding portion can slide along the bottom surface of the groove.

6. The mid-mounted motor transmission device for a bicycle according to any one of claims 1 to 4, characterized in that: Each of the first cogging portions and each of the second cogging portions are ratchet teeth, and the shape of each of the second cogging portions corresponds to the shape of each of the first cogging portions.

7. The mid-mounted motor transmission device for a bicycle according to claim 6, wherein: Each of the first cogwheel portions comprises: A first tooth surface and a second tooth surface are connected to the second tooth surface, extend toward the output gear, and are inclined toward the tangent direction of the rotation direction of the clutch gear.

8. The mid-mounted motor transmission device for a bicycle according to any one of claims 1 to 4, wherein: The first abutment portion protrudes from a side of the clutch gear facing the push plate, and the second abutment portion protrudes from a 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.

9. The mid-mounted motor transmission device for a bicycle according to any one of claims 1 to 4, wherein: The actuator further comprises: A first magnetic component is disposed on the base shell and located beside the opening.

10. The mid-mounted motor transmission device for a bicycle according to any one of claims 1 to 4, characterized in that: The pusher plate comprises a magnetically attractable material; and The pusher further has a second magnetic component, which is arranged on the inner bottom surface to attract the push disk.

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