Composite middle motor transmission module and electric power-assisted bicycle

Abstract

The utility model discloses a compound type centrally-mounted motor transmission module and an electric power-assisted bicycle, the compound type centrally-mounted motor transmission module comprises a center shaft assembly, motor assemblies, a speed reduction assembly and a control assembly, the motor assemblies surround the center shaft assembly and are arranged at intervals, and each motor assembly comprises a stator and a rotor which are coupled with each other; the speed reduction assembly is arranged around the middle shaft assembly, the speed reduction assembly and the motor assembly are arranged in the axial direction, the speed reduction assembly is a planetary gear transmission mechanism, and the input end of the speed reduction assembly and the rotor are connected and rotate synchronously. The control assembly comprises a mounting base and a plurality of control panels, the control panels are integrated on the mounting base, and at least part of the mounting base is located in a gap between the motor assembly and the middle shaft assembly. Through the integrated design of the control assembly and the mutual compact arrangement of the control assembly, the motor assembly and the speed reduction assembly, the required arrangement space can be reduced, the size of the composite type middle motor transmission module can be reduced, and the arrangement of the composite type middle motor transmission module is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of electric power-assisted bicycles, in particular to a composite mid-mounted motor transmission module and an electric power-assisted bicycle. Background Art

[0002] Electric power-assisted bicycles, also known as smart electric bicycles, are a type of riding tool between bicycles and electric vehicles. The motor is directly responsible for mechanical transmission, acting on the pedaling force of the vehicle to complete the conversion of electrical energy into kinetic energy, and is the ultimate tool for providing auxiliary power.

[0003] The motor power-assist system of electric power-assisted bicycles can be roughly divided into mid-mounted and hub-mounted types. The mid-mounted motor system is installed at the five-way position of the frame, and the center of gravity of the vehicle body is reasonably distributed. The motor is connected to the vehicle body and connected to the rear wheel through a chain to transmit power. In the related art, the mid-mounted motor system is large in size, which is not conducive to layout and there is room for improvement. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a composite mid-mounted motor transmission module, which has a small volume and is easy to arrange.

[0005] The utility model also provides an electric power-assisted bicycle with the composite mid-mounted motor transmission module.

[0006] According to the first aspect of the utility model, the composite mid-mounted motor transmission module comprises: a central axis assembly; a motor assembly, the motor assembly surrounds the central axis assembly and is arranged at intervals, the motor assembly comprises a stator and a rotor coupled to each other; a reduction assembly, the reduction assembly is arranged around the central axis assembly, the reduction assembly and the motor assembly are arranged axially, the reduction assembly is a planetary gear transmission mechanism, the input end of the reduction assembly is connected to the rotor and rotates synchronously; a control assembly, the control assembly comprises: a mounting seat and a plurality of control panels, the plurality of control panels are integrated on the mounting seat, and at least a portion of the mounting seat is located in the gap between the motor assembly and the central axis assembly.

[0007] According to the composite mid-mounted motor transmission module of the utility model, by integrating the design of the control component and arranging the control component, the motor component and the reduction component in a compact manner, the required layout space can be reduced, which is beneficial to reducing the volume of the composite mid-mounted motor transmission module, thereby realizing the miniaturization of the composite mid-mounted motor transmission module and facilitating the layout of the composite mid-mounted motor transmission module.

[0008] In some embodiments, the control component also includes: a mounting ring and a torque speed sensor, wherein the mounting ring is arranged around the middle shaft component and is located in the gap between the motor component and the middle shaft component, and the torque speed sensor is mounted on the mounting ring.

[0009] In some embodiments, the mounting seat includes: a mounting end plate and a mounting sleeve, the mounting end plate is located on the side of the motor assembly away from the reduction assembly, the mounting end plate is covered by and is integrally formed with the mounting sleeve, and the mounting sleeve is covered by the mounting ring and connected to the mounting ring; the control assembly includes: a sensor control component, the sensor control component is integrated on the mounting end plate, and is electrically connected to the torque and speed sensor.

[0010] In some embodiments, the control component includes: a motor control component, which is located on a side of the motor component away from the deceleration component, and is electrically connected to the motor component; the motor control component is mounted on the mounting base, or the motor control component is integrated on the mounting base.

[0011] In some embodiments, the motor assembly includes a motor shaft tube, which surrounds the middle shaft assembly and is spaced apart, and the motor shaft tube is connected to the rotor; the input end of the reduction assembly is a sun gear, which surrounds the middle shaft assembly and is spaced apart, and one end of the motor shaft tube is connected to the sun gear; the control assembly also includes: a mounting ring and a torque and speed sensor mounted on the mounting ring, the mounting ring is arranged around the middle shaft assembly, and the mounting ring is located in the gap between the motor shaft tube and the middle shaft assembly.

[0012] In some embodiments, the reduction assembly includes: a planet carrier, which is arranged around the sun gear; at least two planetary wheels, which are connected to the planet carrier at circumferential intervals, and all of the planetary wheels are meshed with the sun gear; a movable internal ring gear, which is externally mounted and meshed with all of the planetary wheels, and the movable internal ring gear is the output end of the reduction assembly.

[0013] In some embodiments, each of the planetary gears includes a planetary gear and a planetary gear pinion distributed along the axial direction, and the diameter of the planetary gear is larger than the diameter of the planetary gear pinion; the planetary gear is meshed with the sun gear, and the planetary gear pinion is meshed with the moving inner ring gear; the reduction assembly also includes: a stationary inner ring gear, which is fixed relative to the stator, and the stationary inner ring gear is outermost and meshed with all the planetary gears.

[0014] In some embodiments, the planet carrier is a fully floating carrier, or the planet carrier is supported by cooperating with a first support bearing; when the planet carrier cooperates with the first support bearing, the first support bearing is located at one axial end of the planetary wheel, or the first support bearing is located at both axial ends of the planetary wheel.

[0015] In some embodiments, the central shaft assembly includes a first half-shaft and a second half-shaft connected to each other, the mounting ring is sleeved on the second half-shaft, the first half-shaft is provided with a first internal spline, the mounting ring is provided with a second internal spline, the second half-shaft is provided with an external spline on the outside, the first half-shaft and the second half-shaft are spline-connected, the mounting ring and the second half-shaft are spline-connected, and the first half-shaft and the mounting ring are axially connected.

[0016] In some embodiments, the output end of the reduction assembly is dynamically connected to the middle shaft assembly; or, the composite mid-mounted motor transmission module further includes: an output shaft tube sleeved on the middle shaft assembly, and the output end of the reduction assembly is dynamically connected to the output shaft tube.

[0017] In some embodiments, the composite mid-mounted motor transmission module includes the output shaft tube; the composite mid-mounted motor transmission module also includes: a first one-way clutch, the first one-way clutch is disposed between the middle shaft assembly and the output shaft tube to transmit the power of the middle shaft assembly to the output shaft tube in one direction; a second one-way clutch, the second one-way clutch is disposed between the output shaft tube and the reduction assembly to transmit the power of the reduction assembly to the output shaft tube in one direction.

[0018] In some embodiments, the composite mid-mounted motor transmission module further includes: a shell, the shell defining a first cavity, a second cavity, and a third cavity sequentially arranged along the axial direction; the central axis assembly is rotatably arranged on the shell, the central axis assembly sequentially passing through the first cavity, the second cavity, and the third cavity along the axial direction; at least part of the control assembly is located in the first cavity, the stator and the rotor are located in the second cavity, and the reduction assembly is located in the third cavity; the composite mid-mounted motor transmission module further includes: a plurality of bearings connected to the shell, the bearings being used to support the central axis assembly and the rotor.

[0019] The electric power-assisted bicycle according to the second aspect of the utility model comprises the composite mid-mounted motor transmission module according to the first aspect of the utility model.

[0020] According to the electric power-assisted bicycle of the present invention, by providing the composite mid-mounted motor transmission module of the first aspect of the present invention, the volume of the electric power-assisted bicycle can be reduced and the sport performance of the electric power-assisted bicycle can be improved.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a composite mid-mounted motor transmission module according to an embodiment of the utility model;

[0023] Figure 2 It is a partial structural schematic diagram of a composite mid-mounted motor transmission module according to an embodiment of the utility model;

[0024] Figure 3 It is another partial structural schematic diagram of the composite mid-mounted motor transmission module according to one embodiment of the utility model;

[0025] Figure 4 It is a structural schematic diagram of a mounting base of a control assembly according to an embodiment of the utility model;

[0026] Figure 5 It is a structural schematic diagram of a motor control component of a control assembly according to an embodiment of the utility model;

[0027] Figure 6 It is another partial structural schematic diagram of a composite mid-mounted motor transmission module according to an embodiment of the utility model;

[0028] Figure 7 It is a partial structural schematic diagram of a deceleration assembly according to an embodiment of the utility model;

[0029] Figure 8 is another partial structural schematic diagram of a deceleration assembly according to an embodiment of the utility model;

[0030] Fig. 9 It is a structural schematic diagram of a static internal gear ring of a reduction assembly according to an embodiment of the utility model;

[0031] Fig.10 is a structural schematic diagram of a composite mid-mounted motor transmission module according to another embodiment of the utility model;

[0032] Fig.11 is a structural schematic diagram of a central axis assembly according to another embodiment of the utility model;

[0033] Fig.12 It is a schematic diagram of the housing structure of a composite mid-mounted motor transmission module according to an embodiment of the utility model.

[0034] Reference numerals:

[0035] Composite mid-mounted motor transmission module 100;

[0036] Middle shaft assembly 1; first half shaft 11; second half shaft 12;

[0037] Motor assembly 2; stator 21; rotor 22; motor shaft tube 23;

[0038] Speed ​​reduction assembly 3; sun gear 31; planet carrier 32; first support bearing 321; planet gear 33; planetary gear 331; planetary gear 332; dynamic internal gear ring 34; static internal gear ring 35;

[0039] Control assembly 4; mounting seat 41; mounting end plate 411; mounting sleeve 412; control board 42; motor driver control board 421; mounting ring 43; sensor control element 44; motor control element 45; encoder magnetic ring 46;

[0040] Output shaft tube 5;

[0041] A first one-way clutch 61; a second one-way clutch 62;

[0042] Shell 7; first chamber 7a; second chamber 7b; third chamber 7c;

[0043] Bearing 8. DETAILED DESCRIPTION

[0044] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0045] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0046] The following describes a composite mid-mounted motor transmission module 100 according to an embodiment of the present invention with reference to the accompanying drawings.

[0047] According to the composite mid-mounted motor transmission module 100 of the embodiment of the utility model, Figure 1-Figure 3As shown, it includes: a central axis component 1, a motor component 2, a reduction component 3 and a control component 4, the motor component 2 surrounds the central axis component 1 and is arranged at intervals, the motor component 2 includes a stator 21 and a rotor 22 coupled to each other, the reduction component 3 is arranged around the central axis component 1, the reduction component 3 and the motor component 2 are arranged axially, the reduction component 3 is a planetary gear transmission mechanism, and the input end of the reduction component 3 is connected to the rotor 22 and rotates synchronously. The control component 4 includes: a mounting seat 41 and a plurality of control boards 42, the plurality of control boards 42 are integrated on the mounting seat 41, and at least a portion of the mounting seat 41 is located in the gap between the motor component 2 and the central axis component 1.

[0048] The composite mid-mounted motor transmission module 100 of the embodiment of the utility model is used for an electric power-assisted bicycle. The composite mid-mounted motor transmission module 100 is installed at the five-way position of the bicycle frame, and the center of gravity is reasonably distributed. The composite mid-mounted motor transmission module 100 is connected to the vehicle body and is connected to the rear wheel through a chain to transmit power.

[0049] The axial ends of the middle shaft assembly 1 are connected to the pedals. When the user steps on the pedals, the pedals directly act on the middle shaft assembly 1, and the rotational power is transmitted to the wheels of the electric power-assisted bicycle through the middle shaft assembly 1, thereby driving the electric power-assisted bicycle to travel.

[0050] In addition to being able to drive the electric power-assisted bicycle by human power, the electric power-assisted bicycle can also be driven by the motor assembly 2 and the reduction assembly 3. The motor assembly 2 provides power, the reduction assembly 3 transmits power, and the high-speed low-torque generated by the motor assembly 2 is converted into low-speed high-torque, which can provide the electric power-assisted bicycle with stronger climbing ability and acceleration performance.

[0051] The reduction assembly 3 and the motor assembly 2 are both arranged around the central axis assembly 1. The reduction assembly 3 is coaxially arranged. Compared with the coaxially arranged reduction assembly 3 in the related art, the reduction assembly 3 of the embodiment of the utility model occupies a smaller space in the radial direction, which can realize the miniaturization and lightweight of the composite mid-mounted motor transmission module 100.

[0052] The composite mid-mounted motor transmission module 100 further includes a control assembly 4, which includes a control board 42 for controlling the operation of the motor assembly 2 and the reduction assembly 3. There are multiple control boards 42, and the multiple control boards 42 are integrated on the mounting seat 41. Compared with distributing the control boards 42 in the composite mid-mounted motor transmission module 100, the integrated arrangement of the control assembly 4 in the embodiment of the utility model facilitates the assembly of the control assembly 4 on the one hand, and can reduce the volume of the control assembly 4 on the other hand, which is conducive to reducing the internal space occupied by the composite mid-mounted motor transmission module 100 and the volume of the composite mid-mounted motor transmission module 100.

[0053] like Figure 1As shown, the control component 4, the motor component 2 and the reduction component 3 are sequentially arranged along the axial direction of the central shaft component 1, which can save radial space of the composite central motor transmission module 100 and is conducive to reducing the volume of the composite central motor transmission module 100. Figure 2 and Figure 3 As shown, at least part of the control component 4 is located in the gap between the motor component 2 and the central axis component 1, and part of the control component 4 is also located on the radial side of the motor component 2. The arrangement structure of the control component 4 and the motor component 2 is compact, which reduces the required arrangement space and is conducive to reducing the volume of the composite mid-mounted motor transmission module 100.

[0054] According to the composite mid-mounted motor transmission module 100 of the present invention, by integrating the design of the control component 4 and arranging the control component 4, the motor component 2 and the reduction component 3 in a compact manner, the required layout space can be reduced, which is beneficial to reducing the volume of the composite mid-mounted motor transmission module 100, thereby realizing the miniaturization of the composite mid-mounted motor transmission module 100 and facilitating the layout of the composite mid-mounted motor transmission module 100.

[0055] In some embodiments of the present invention, Figure 2 and Figure 3 As shown, the control component 4 also includes: a mounting ring 43 and a torque speed sensor. The torque speed sensor is mounted on the mounting ring 43. The torque speed sensor is not shown in the figure. The torque speed sensor is used to detect the torque transmitted by the middle shaft component 1.

[0056] The mounting ring 43 is arranged around the middle shaft assembly 1 and is located in the gap between the motor assembly 2 and the middle shaft assembly 1. The mounting ring 43 is arranged outside the middle shaft assembly 1 to detect the torque of the middle shaft assembly 1, and the mounting ring 43 is located between the motor assembly 2 and the middle shaft assembly 1 so that the mounting ring 43 and the motor assembly 2 are arranged radially, and the arrangement structure of the control assembly 4 and the motor assembly 2 is compact, which reduces the required arrangement space and is conducive to reducing the volume of the composite middle-mounted motor transmission module 100.

[0057] In some embodiments of the present invention, Figure 2 and Figure 4 As shown, the mounting seat 41 includes: a mounting end plate 411 and a mounting sleeve 412. The mounting end plate 411 is located on the side of the motor assembly 2 away from the reduction assembly 3. The mounting end plate 411 is covered and is integrally formed with the mounting sleeve 412. The mounting sleeve 412 is covered with the mounting ring 43 and is connected to the mounting ring 43.

[0058] like Figure 2As shown, the mounting seat 41 has a central through hole, and the mounting seat 41 is sleeved on the outside of the middle shaft assembly 1. The mounting seat 41 includes an integrally formed mounting end plate 411 and a mounting sleeve 412. The structural reliability of the mounting seat 41 is strong, and the working stability is improved. The mounting sleeve 412 extends from the motor assembly 2 to the direction of the reduction assembly 3, and the mounting sleeve 412 is sleeved with the mounting ring 43 and connected to the mounting ring 43. The mounting ring 43 and the mounting seat 41 of the control assembly 4 are both rotating bodies and are sleeved on the outside of the middle shaft assembly 1. The center of gravity distribution is reasonable, which can improve the layout stability.

[0059] In some embodiments of the present invention, Figure 4 As shown, the control component 4 includes: a sensor control component 44, which is integrated on the mounting end plate 411, so as to facilitate the assembly of the control component 4 and reduce the volume of the control component 4.

[0060] The sensor control component 44 is electrically connected to the torque sensor on the mounting ring 43 and can receive and transmit signals for control.

[0061] In some embodiments of the present invention, Figure 2 and Figure 5 As shown, the control component 4 includes: a motor control component 45, which is located on the side of the motor component 2 away from the reduction component 3, and the motor control component 45 is electrically connected to the motor component 2. A motor driver control board 421 is provided on the motor control component 45, and the motor control component 45 is used to control the operation of the motor component 2.

[0062] The motor control component 45 is sheathed on the mounting base 41, or the motor control component 45 is integrated on the mounting base 41, which is convenient for the assembly of the control component 4 and can also reduce the volume of the control component 4, which is beneficial to reducing the internal space occupied by the composite mid-mounted motor transmission module 100 and is beneficial to reducing the volume of the composite mid-mounted motor transmission module 100.

[0063] Alternatively, if Figure 2 and Figure 5 As shown, the motor control component 45 is sleeved on the mounting seat 41 , and the motor control component 45 and the mounting seat 41 are arranged in close contact. The motor control component 45 and the mounting seat 41 are connected to reduce the volume of the control component 4 .

[0064] Optionally, the sensor control component 44 and the motor control component 45 are both integrated on the mounting base 41 to integrate the control component 4.

[0065] In some embodiments of the present invention, Figure 2As shown, the control component 4 includes: an encoder magnetic ring 46 which is wrapped around and connected to the middle shaft component 1 , the encoder magnetic ring 46 is used to detect the rotation speed signal, and the encoder magnetic ring 46 is located on a side of the mounting seat 41 away from the motor component 2 .

[0066] In some embodiments of the present invention, Figure 1 and Figure 3 As shown, the motor assembly 2 includes a motor shaft tube 23, which surrounds the middle shaft assembly 1 and is arranged at intervals, and the motor shaft tube 23 can rotate relative to the middle shaft assembly 1, and the motor shaft tube 23 is connected to the rotor 22. When the motor assembly 2 is running, the rotation of the rotor 22 drives the motor shaft tube 23 to rotate, and the motor shaft tube 23 outputs power.

[0067] In some embodiments of the present invention, Figure 1 and Figure 3 As shown, the motor assembly 2 is an inner rotor motor, the rotor 22 is located inside the stator 21, and the motor shaft tube 23 is connected to the rotor 22 to output power.

[0068] In some embodiments of the present invention, Figure 6 As shown, the input end of the reduction assembly 3 is a sun gear 31, which surrounds the middle shaft assembly 1 and is arranged at intervals, and one end of the motor shaft tube 23 is connected to the sun gear 31. The control assembly 4 also includes: a mounting ring 43 and a torque speed sensor mounted on the mounting ring 43, the mounting ring 43 is arranged around the middle shaft assembly 1, and the mounting ring 43 is located in the gap between the motor shaft tube 23 and the middle shaft assembly 1. The arrangement structure of the control assembly 4 and the motor assembly 2 is compact, which reduces the required arrangement space and is conducive to reducing the volume of the composite mid-mounted motor transmission module 100.

[0069] In some embodiments of the present invention, Figure 6 As shown, the motor shaft tube 23 and the sun gear 31 are integrally formed, so that the structure of the motor assembly 2 and the reduction assembly 3 is compact, and the transmission between the motor assembly 2 and the reduction assembly 3 is stable and the working reliability is strong.

[0070] In some embodiments of the present invention, Figure 6 and Figure 7 As shown, the reduction assembly 3 includes: a planet carrier 32, planetary gears 33 and a movable internal gear ring 34. The planet carrier 32 is arranged around the sun gear 31. The planetary gears 33 are connected to the planet carrier 32 at intervals along the circumferential direction. All the planetary gears 33 are meshed with the sun gear 31. The movable internal gear ring 34 is outermost and meshed with all the planetary gears 33. The movable internal gear ring 34 is the output end of the reduction assembly 3.

[0071] A plurality of planetary gears 33 mesh with the sun gear 31, and the planetary carrier 32 supports the planetary gears 33 to maintain relative positions. The planetary gears 33 rotate around the sun gear 31 under the support of the planetary carrier 32, and also revolve along the sun gear 31 while rotating. The inner side of the planetary gear 33 meshes with the sun gear 31, and the outer side of the planetary gear 33 meshes with the dynamic inner gear ring 34, which is the output end of the reduction assembly 3. The reduction ratio of the transmission structure formed by the sun gear 31, the planetary gear 33, and the dynamic inner gear ring 34 is increased, which is conducive to improving the transmission ratio, increasing the output torque, and improving the movement efficiency of the electric power-assisted bicycle.

[0072] Compared with the planetary transmission mechanism in the related art that uses the planet carrier 32 to output torque, the utility model provides a movable internal gear ring 34 to output a larger torque and a larger reduction ratio of the transmission structure.

[0073] In some embodiments of the present invention, Figure 6 and Figure 8 As shown, each planetary gear 33 includes a planetary gear 331 and a planetary gear 332 distributed along the axial direction, and the diameter of the planetary gear 331 is larger than the diameter of the planetary gear 332. The planetary gear 331 meshes with the sun gear 31, and the planetary gear 332 meshes with the moving inner gear ring 34. Figure 1 and Fig. 9 As shown, the reduction assembly 3 further includes: a stationary internal gear ring 35 , which is fixed relative to the stator 21 , and is covered with and meshed with all the planetary gears 331 .

[0074] The planetary gear 331 and the planetary pinion 332 are fixedly connected and coaxially arranged. The planetary gear 331 and the planetary pinion 332 are fixedly connected and have the same rotation speed and torque. The sun gear 31 meshes with the inner side of the planetary gear 331, the stationary inner gear ring 35 meshes with the outer side of the planetary gear 331, and the outer side of the planetary pinion 332 meshes with the movable inner gear ring 34, and the movable inner gear ring 34 outputs torque.

[0075] In some embodiments of the present invention, the transmission ratio of the reduction assembly 3 is calculated by the following formula (1):

[0076]

[0077] Where i is the transmission ratio of the reduction assembly 3, Z a is the number of teeth of the sun gear 31, Z b is the number of teeth of the planetary gear 331, Z c is the number of teeth of the static internal gear ring 35, Z d is the number of teeth of the planetary pinion 332, Z e is the number of teeth of the movable internal gear ring 34 .

[0078] The motor shaft tube 23, sun gear 31, planet carrier 32, static internal gear ring 35 and dynamic internal gear ring 34 in the composite mid-mounted motor transmission module 100 of the embodiment of the utility model are all coaxially arranged with the central shaft assembly 1, which can make the various parts in the composite mid-mounted motor transmission module 100 more compact, thereby reducing the axial size of the central shaft assembly 1, which is beneficial to reducing the volume of the composite mid-mounted motor transmission module 100, which is beneficial to the user's exertion of force, and at the same time reduces the windward area, which can reduce wind resistance and improve sports performance.

[0079] In some embodiments of the present invention, Figure 1 As shown, the planet carrier 32 is a full floating carrier.

[0080] In other embodiments of the present invention, Fig.10 As shown, the planet carrier 32 is supported by the first support bearing 321 . The first support bearing 321 is located at one axial end of the planet gear 33 . There may be one or two first support bearings 321 .

[0081] In some further embodiments of the present invention, the planet carrier 32 is supported by cooperating with the first support bearing 321 , and the first support bearing 321 is located at two axial ends of the planet gear 33 .

[0082] Optionally, the first support bearing 321 may be a radial bearing; or, further optionally, the first support bearing 321 may also be a four-point ball bearing; or, further optionally, the first support bearing 321 may be a crossed roller bearing. The structure of the planet carrier 32 may be selected according to actual needs.

[0083] In some embodiments of the present invention, Fig.11 As shown, the middle shaft assembly 1 includes a first half shaft 11 and a second half shaft 12 connected to each other, a mounting ring 43 is sleeved on the second half shaft 12, the first half shaft 11 is provided with a first internal spline, the mounting ring 43 is provided with a second internal spline, the second half shaft 12 is provided with an external spline, the first half shaft 11 and the second half shaft 12 are spline-connected, the mounting ring 43 and the second half shaft 12 are spline-connected, and the first half shaft 11 and the mounting ring 43 are axially connected.

[0084] The axial ends of the middle shaft assembly 1 are connected to the pedals, the end of the first half shaft 11 away from the second half shaft 12 is connected to the pedals, and the end of the second half shaft 12 away from the first half shaft 11 is connected to the pedals. By spline-connecting the mounting ring 43 and the second half shaft 12, and axially connecting the mounting ring 43 and the first half shaft 11, the torque transmitted from both ends of the middle shaft assembly 1 can be transmitted to the mounting ring 43, and can be detected by the torque speed sensor on the mounting ring 43.

[0085] By spline-connecting the first half-shaft 11 and the second half-shaft 12, and spline-connecting the mounting ring 43 and the second half-shaft 12, the outer diameter of the mounting ring 43 is substantially consistent with the first half-shaft 11, thereby reducing the radial space occupied, which is beneficial to reducing the volume of the composite mid-mounted motor transmission module 100.

[0086] In some embodiments of the present invention, the first half shaft 11 and the second half shaft 12 are connected by splines, and the first half shaft 11 and the second half shaft 12 are fixedly connected by fasteners, which can improve the connection reliability of the first half shaft 11 and the second half shaft 12.

[0087] In some embodiments of the present invention, the output end of the reduction assembly 3 is dynamically connected to the middle shaft assembly 1 .

[0088] When the user drives the electric power-assisted bicycle manually, the pedals drive the middle shaft assembly 1 to rotate, thereby driving the electric power-assisted bicycle to travel.

[0089] When the motor assembly 2 drives the electric power-assisted bicycle to travel, the motor assembly 2 outputs power to the reduction assembly 3. After the reduction assembly 3 reduces speed and increases torque, it drives the middle shaft assembly 1 to rotate, and then drives the electric power-assisted bicycle to travel.

[0090] In other embodiments of the present invention, Figure 6 As shown, the composite mid-mounted motor transmission module 100 further includes: an output shaft tube 5 which is sleeved on the middle shaft assembly 1 , and the output end of the reduction assembly 3 is dynamically connected to the output shaft tube 5 .

[0091] When the user drives the electric power-assisted bicycle manually, the pedal drives the middle shaft assembly 1 to rotate, and the middle shaft assembly 1 drives the output shaft tube 5 to rotate, thereby driving the electric power-assisted bicycle to travel.

[0092] When the motor assembly 2 drives the electric power-assisted bicycle to travel, the motor assembly 2 outputs power to the reduction assembly 3. After the reduction assembly 3 reduces speed and increases torque, the reduction assembly 3 drives the output shaft tube 5 to rotate, thereby driving the electric power-assisted bicycle to travel.

[0093] In some embodiments of the present invention, Figure 6 As shown, the reduction assembly 3 includes: a planet carrier 32, planetary gears 33 and a movable inner gear ring 34. The planet carrier 32 is arranged around the sun gear 31. The planetary gears 33 are connected to the planet carrier 32 at intervals along the circumferential direction. All the planetary gears 33 are meshed with the sun gear 31. The movable inner gear ring 34 is outer-coated and meshed with all the planetary gears 33. The movable inner gear ring 34 is the output end of the reduction assembly 3. The movable inner gear ring 34 is outer-coated on the outside of the output shaft tube 5. The movable inner gear ring 34 is connected to the output shaft tube 5 to drive the output shaft tube 5 to rotate.

[0094] In some embodiments of the present invention, the composite mid-mounted motor transmission module 100 includes an output shaft tube 5, and the output shaft tube 5 transmits power to the wheels of the electric power-assisted bicycle, thereby driving the electric power-assisted bicycle to travel.

[0095] like Figure 6 As shown, the composite mid-mounted motor transmission module 100 further includes: a first one-way clutch 61 and a second one-way clutch 62, wherein the first one-way clutch 61 is sleeved between the middle shaft assembly 1 and the output shaft tube 5 to transmit the power of the middle shaft assembly 1 to the output shaft tube 5 in one direction; the second one-way clutch 62 is sleeved between the output shaft tube 5 and the reduction assembly 3 to transmit the power of the reduction assembly 3 to the output shaft tube 5 in one direction.

[0096] When the user manually drives the middle shaft assembly 1 to rotate, the first one-way clutch 61 connects the middle shaft assembly 1 and the output shaft tube 5, and the power of the middle shaft assembly 1 is transmitted to the output shaft tube 5, while the second one-way clutch 62 separates the reduction assembly 3 and the output shaft tube 5 to avoid interference between the reduction assembly 3 and the output shaft tube 5. When the motor assembly 2 outputs power, the first one-way clutch 61 separates the middle shaft assembly 1 and the output shaft tube 5, while the second one-way clutch 62 connects the reduction assembly 3 and the output shaft tube 5 to transmit power to the output shaft tube 5 to avoid interference between the output shaft tube 5 and the middle shaft assembly 1.

[0097] The first one-way clutch 61 and the second one-way clutch 62 are provided to eliminate the phenomenon of magnetic resistance or mechanical resistance to the output shaft tube 5 when the motor assembly 2 stops running, thereby ensuring that no additional burden is imposed on the rider when the motor assembly 2 is not assisting. In addition, the human power output and the power of the motor assembly 2 can be separated without affecting each other, thereby preventing human pedaling from driving the motor to rotate, protecting the motor assembly 2, and extending the service life of the motor assembly 2.

[0098] In some embodiments of the present invention, the first one-way clutch 61 and the second one-way clutch 62 are arranged at intervals in the radial direction, the first one-way clutch 61 is arranged between the outer diameter of the middle shaft assembly 1 and the inner diameter of the output shaft tube 5, and the second one-way clutch 62 is arranged between the outer diameter of the output shaft tube 5 and the reduction assembly 3. The arrangement of the first one-way clutch 61 and the second one-way clutch 62 being arranged at intervals in the radial direction can reduce the space occupied by the first one-way clutch 61 and the second one-way clutch 62 in the axial direction, which is conducive to reducing the axial size of the composite mid-mounted motor transmission module 100.

[0099] The space occupied by the output shaft tube 5 and the reduction assembly 3 in the radial direction of the central shaft assembly 1 is already relatively large, and arranging the first one-way clutch 61 and the second one-way clutch 62 in the radial direction will not increase the radial size of the composite mid-mounted motor transmission module 100.

[0100] In some embodiments of the utility model, the composite mid-mounted motor transmission module 100 includes an output shaft tube 5, and the composite mid-mounted motor transmission module 100 is only provided with a second one-way clutch 62, and the second one-way clutch 62 is sleeved between the output shaft tube 5 and the reduction assembly 3 to transmit the power of the reduction assembly 3 to the output shaft tube 5 in one direction.

[0101] When the user drives the middle shaft assembly 1 to rotate manually, the power of the middle shaft assembly 1 is transmitted to the output shaft tube 5, and the second one-way clutch 62 separates the reduction assembly 3 and the output shaft tube 5 to avoid interference between the reduction assembly 3 and the output shaft tube 5. When the motor assembly 2 outputs power, the output shaft tube 5 rotates to drive the middle shaft assembly 1 to rotate, and the user can remove his feet from the pedals, which can also avoid interference between the user and the motor assembly 2. In addition, this design method can save the one-way clutch, which is conducive to the miniaturization and lightweight of the composite mid-mounted motor transmission module 100.

[0102] In some embodiments of the present invention, Figure 1 and Fig.12 As shown, the composite mid-mounted motor transmission module 100 further includes: a housing 7, wherein a first cavity 7a, a second cavity 7b and a third cavity 7c are sequentially arranged along the axial direction. The middle shaft assembly 1 is rotatably arranged on the housing 7, and the middle shaft assembly 1 is sequentially penetrated by the first cavity 7a, the second cavity 7b and the third cavity 7c along the axial direction.

[0103] The control assembly 4, the motor assembly 2 and the reduction assembly 3 are all arranged in the housing 7, and the static inner gear ring 35 of the reduction assembly 3 is fixedly connected in the housing 7 by splines, and the housing 7 can play a supporting role. The housing 7 can also play a protective role, reducing the external pollutants from entering the housing 7 and contacting the control assembly 4, the motor assembly 2 and the reduction assembly 3, thereby improving the working reliability of the composite mid-mounted motor transmission module 100.

[0104] The interior of the housing 7 is divided into a first cavity 7a, a second cavity 7b and a third cavity 7c, at least part of the control component 4 is located in the first cavity 7a, the stator 21 and the rotor 22 are located in the second cavity 7b, and the reduction component 3 is located in the third cavity 7c. The control component 4, the motor component 2 and the reduction component 3 are arranged separately, which can reduce the difficulty of arrangement and installation, reduce interference between components, and improve working stability.

[0105] In some embodiments of the present invention, Figure 6 and Fig.12 As shown, the composite mid-mounted motor transmission module 100 further includes: a plurality of bearings 8 connected to the housing 7 , and the bearings 8 are used to support the central shaft assembly 1 and the rotor 22 .

[0106] like Fig.12As shown, the side of the middle shaft assembly 1 close to the first half shaft 11 is supported by a deep groove ball bearing, and the deep groove ball bearing bears radial force and axial force; the side of the middle shaft assembly 1 close to the second half shaft 12 is supported by a needle roller bearing, and the needle roller bearing assembly is integrated with rolling elements and seals to bear radial force.

[0107] The electric power-assisted bicycle according to the embodiment of the second aspect of the utility model comprises the composite mid-mounted motor transmission module 100 of the first aspect of the utility model.

[0108] According to the electric power-assisted bicycle of the second embodiment of the utility model, by setting the composite mid-mounted motor transmission module 100 of the first embodiment of the utility model, the volume of the electric power-assisted bicycle can be reduced and the sports performance of the electric power-assisted bicycle can be improved.

[0109] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "inner", "outer", "axial", "radial", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0110] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0111] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0112] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0113] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0114] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A composite mid-mounted motor transmission module, characterized in that: include: Middle shaft assembly; A motor assembly, the motor assembly surrounds the central shaft assembly and is arranged at intervals, the motor assembly comprising a stator and a rotor coupled to each other; A reduction assembly, wherein the reduction assembly is arranged around the central shaft assembly, the reduction assembly and the motor assembly are arranged axially, the reduction assembly is a planetary gear transmission mechanism, and the input end of the reduction assembly is connected to the rotor and rotates synchronously; A control component, the control component comprises: a mounting seat and a plurality of control boards, the plurality of control boards are integrated on the mounting seat, and at least a portion of the mounting seat is located in the gap between the motor assembly and the middle shaft assembly.

2. The composite mid-mounted motor transmission module according to claim 1, characterized in that: The control component also includes: a mounting ring and a torque speed sensor. The mounting ring is arranged around the middle shaft component and is located in the gap between the motor component and the middle shaft component. The torque speed sensor is mounted on the mounting ring.

3. The composite mid-mounted motor transmission module according to claim 2, characterized in that: The mounting seat comprises: a mounting end plate and a mounting sleeve, wherein the mounting end plate is located at a side of the motor assembly away from the reduction assembly, the mounting end plate is covered with a sleeve and is integrally formed with the mounting sleeve, and the mounting sleeve is covered with the mounting ring and is connected to the mounting ring; The control component includes: a sensor control component, which is integrated on the mounting end plate and electrically connected to the torque and speed sensor.

4. The composite mid-mounted motor transmission module according to claim 2, characterized in that: The control assembly comprises: a motor control component, the motor control component is located at a side of the motor assembly away from the speed reduction assembly, and the motor control component is electrically connected to the motor assembly; The motor control component is mounted on the mounting seat, or the motor control component is integrated on the mounting seat.

5. The composite mid-mounted motor transmission module according to claim 1, characterized in that: The motor assembly comprises a motor shaft tube, the motor shaft tube surrounds the middle shaft assembly and is arranged at intervals, and the motor shaft tube is connected to the rotor; The input end of the reduction assembly is a sun gear, which surrounds the middle shaft assembly and is arranged at intervals, and one end of the motor shaft tube is connected to the sun gear; The control component also includes: a mounting ring and a torque speed sensor mounted on the mounting ring, wherein the mounting ring is arranged around the middle shaft component and the mounting ring is located in a gap between the motor shaft tube and the middle shaft component.

6. The composite mid-mounted motor transmission module according to claim 5, characterized in that: The deceleration assembly comprises: A planet carrier, the planet carrier is arranged around the sun gear; at least two planetary gears, the planetary gears being connected to the planet carrier at intervals in the circumferential direction, and all the planetary gears being meshed with the sun gear; A movable inner gear ring is disposed on the outer sleeve and meshes with all the planetary gears. The movable inner gear ring is the output end of the reduction assembly.

7. The composite mid-mounted motor transmission module according to claim 6, characterized in that: Each of the planetary gears comprises a planetary gear and a planetary gear distributed along the axial direction, and the diameter of the planetary gear is greater than the diameter of the planetary gear; The planetary gear meshes with the sun gear, and the planetary pinion meshes with the moving internal gear ring; The reduction assembly further includes a stationary inner gear ring, which is fixed relative to the stator and is fitted around the stator and meshes with all the planetary gears.

8. The composite mid-mounted motor transmission module according to claim 6, characterized in that: The planet carrier is a full floating carrier, or the planet carrier is supported by cooperating with the first support bearing; When the planet carrier cooperates with the first support bearing, the first support bearing is located at one axial end of the planet gear, or the first support bearing is located at two axial ends of the planet gear.

9. The composite mid-mounted motor transmission module according to claim 2, characterized in that: The central shaft assembly includes a first half-shaft and a second half-shaft that are connected, the mounting ring sleeve is disposed on the second half-shaft, the first half-shaft is provided with a first internal spline, the mounting ring is provided with a second internal spline, the second half-shaft is provided with an external spline on the outside, the first half-shaft and the second half-shaft are spline-connected, the mounting ring and the second half-shaft are spline-connected, and the first half-shaft and the mounting ring are axially connected.

10. The composite mid-mounted motor transmission module according to any one of claims 1 to 9, characterized in that: The output end of the reduction assembly is dynamically connected to the middle shaft assembly; Alternatively, the composite mid-mounted motor transmission module further comprises: an output shaft tube sleeved on the central shaft assembly, and the output end of the reduction assembly is dynamically connected to the output shaft tube.

11. The composite mid-mounted motor transmission module according to claim 10, characterized in that: The composite mid-mounted motor transmission module includes the output shaft tube; The composite mid-mounted motor transmission module also includes: A first one-way clutch, wherein the first one-way clutch is sleeved between the middle shaft assembly and the output shaft tube to transmit the power of the middle shaft assembly to the output shaft tube in one direction; A second one-way clutch is sleeved between the output shaft tube and the reduction assembly to transmit the power of the reduction assembly to the output shaft tube in one direction.

12. The composite mid-mounted motor transmission module according to any one of claims 1 to 9, characterized in that: Also includes: A housing, wherein a first cavity, a second cavity and a third cavity are defined in the housing and are sequentially arranged along the axial direction; The central axis component is rotatably disposed on the housing, and the central axis component is provided with the first cavity, the second cavity and the third cavity in sequence along the axial direction; At least part of the control assembly is located in the first cavity, the stator and the rotor are located in the second cavity, and the speed reduction assembly is located in the third cavity; The composite mid-mounted motor transmission module further includes: a plurality of bearings connected to the housing, wherein the bearings are used to support the central shaft assembly and the rotor.

13. An electric power-assisted bicycle, characterized in that: A composite mid-mounted motor transmission module comprising any one of claims 1-12.

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