A mid-mounted variable speed motor

Abstract

The present invention discloses a mid-mounted variable speed motor, which relates to the field of mid-mounted motors. The technical solution thereof includes a central axis mechanism, a power-assisted driving mechanism and a speed-changing mechanism, and also includes a gear-changing driving mechanism, wherein the gear-changing driving mechanism includes a speed superposition actuator component and a gear-changing motor for controlling the speed superposition actuator component. The present invention separates the gear-changing driving mechanism from the speed-changing mechanism, and then connects them by transmission. At the same time, the gear-changing driving mechanism uses a gear-changing motor to realize automatic adjustment of the gear position, which can match the automatic control of the motor, realize centralized control, and facilitate the operation of the rider, thereby improving the riding experience.

Description

Technical Field

[0001] The present invention relates to the field of mid-mounted motors, and more particularly to a mid-mounted variable speed motor. Background Art

[0002] At present, the central motor of the power-assisted bicycle on the market is mainly a common reduction central motor, which cannot change gears to change speed. The speed change of the bicycle still depends on its own bicycle gear switch.

[0003] If the user wants the power of the motor and smooth speed change, two systems are needed: a bicycle gear switcher and a reduction mid-mounted motor. However, the two systems are not only difficult to match, but also the bicycle assembly becomes relatively complicated.

[0004] The existing Chinese patent with authorization announcement number CN104953759B discloses a mid-mounted motor with a variable reduction ratio for an electric bicycle, but the mid-mounted motor can only achieve two different reduction ratios.

[0005] The existing Chinese patent with authorization announcement number CN102770338B discloses a shifting device and a transmission unit, which includes a first shaft constituting a hollow shaft, a first camshaft coaxially arranged in the first shaft, and a driving mechanism connected to the first camshaft, the driving mechanism including a speed superposition transmission mechanism coaxially arranged on the first shaft.

[0006] The shifting device in the above patent can realize multi-speed adjustment. If applied to the mid-mounted motor, it can form a multi-speed mid-mounted motor. However, when the shifting device in the above patent is combined with the existing mid-mounted motor, there are still the following problems: the speed superposition transmission mechanism needs to be manually adjusted and cannot match the automatic control of the mid-mounted motor. Summary of the invention

[0007] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a mid-mounted speed-changing motor, which separates the gear shift drive mechanism from the speed change mechanism and then connects them through transmission. At the same time, the gear shift drive mechanism adopts a gear shift motor to realize automatic adjustment of the gear position, which can be matched with the automatic control of the motor to achieve centralized control, facilitate the rider's operation, and thus improve the riding experience.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A mid-mounted variable speed motor, comprising:

[0010] A middle shaft mechanism, the middle shaft mechanism comprising a middle shaft pedal input gear and a middle shaft output sleeve, the middle shaft output sleeve being provided with a plurality of middle shaft output gears;

[0011] A speed change mechanism, the speed change mechanism comprising a coaxially arranged core shaft and a speed change sleeve, the speed change sleeve being provided with a power-assisted speed change input gear, a pedal speed change input gear meshing with the middle shaft pedal input gear, and a speed change output gear respectively meshing with a plurality of the middle shaft output gears, the speed change mechanism further comprising a speed change drive assembly for realizing speed transmission;

[0012] Also includes:

[0013] A power-assisted driving mechanism, the power-assisted driving mechanism comprising a power-assisted output gear that is driven by the power-assisted speed-changing input gear; and

[0014] The gear shift driving mechanism includes a speed superposition execution component drivingly connected to the core shaft and the speed change shaft sleeve, and a gear shift motor for controlling the speed superposition execution component.

[0015] Furthermore, the power-assisted driving mechanism includes a core assembly and a power-assisted reduction assembly connected to the core assembly, the power-assisted output gear is connected to the power-assisted reduction assembly, and the core assembly and the power-assisted reduction assembly are respectively located on both sides of the power-assisted output gear.

[0016] Furthermore, the power-assisted reduction assembly includes a power-assisted planetary carrier, a power-assisted planetary wheel and a power-assisted internal gear ring; the movement assembly includes a movement shaft, on which a power-assisted sun wheel is arranged; the power-assisted planetary wheel includes a first power-assisted planetary wheel meshed with the power-assisted sun wheel, and a second power-assisted planetary wheel meshed with the power-assisted internal gear ring; the power-assisted output gear is connected to the power-assisted planetary carrier to output the power-assisted rotational speed.

[0017] Furthermore, a positioning ring is extendedly provided on the end surface of the power-assisting planetary carrier opposite to the movement assembly, and the power-assisting output gear is sleeved on the positioning ring and can be linked with the positioning ring along the circumferential direction.

[0018] Furthermore, the speed superposition execution component includes a shift planet carrier, a first shift sun gear, a second shift sun gear, a first shift internal gear ring and a second shift internal gear ring; a first shift planet gear cooperating with the first shift sun gear and the first shift internal gear ring is provided on one side of the shift planet carrier, and a second shift planet gear cooperating with the second shift sun gear and the second shift internal gear ring is provided on the other side;

[0019] The second gear-changing sun gear is fixed, and the gear-changing motor is provided with a driving shaft sleeve connected to the first gear-changing sun gear;

[0020] The speed change sleeve is connected to a sleeve driving member that is circumferentially linked thereto, and the core shaft is connected to a core shaft driving member that is circumferentially linked thereto; the first shift internal gear ring cooperates with the core shaft driving member to transmit the rotational speed, and the second shift internal gear ring cooperates with the sleeve driving member to transmit the rotational speed.

[0021] Furthermore, the rotation speed is transmitted between the first gear-changing inner gear ring and the core shaft driving member, and between the second gear-changing inner gear ring and the sleeve driving member via a synchronous belt.

[0022] Further, the spindle driving member is a spindle driving gear, and the outer side wall of the first shift inner gear ring is provided with a first outer tooth portion meshing with the spindle driving gear; the sleeve driving member is a sleeve driving gear, and the outer side wall of the second shift inner gear ring is provided with a second outer tooth portion meshing with the sleeve driving gear.

[0023] Furthermore, the drive shaft sleeve passes through the shift planet carrier and the second shift sun gear, and there is a clearance fit between the drive shaft sleeve and the shift planet carrier, and between the drive shaft sleeve and the second shift sun gear.

[0024] Furthermore, the speed change drive assembly includes a plurality of ratchets and elastic members, the ratchets including a motor forward ratchet and a motor reverse ratchet that cooperate with the power-assisted speed change input gear, a pedal input ratchet that cooperates with the pedal speed change input gear, and output ratchets that cooperate with a plurality of speed change output gears respectively.

[0025] Furthermore, the pawl is embedded in the speed change shaft sleeve, and includes a flip support part, an engaging transmission part and a press-embedded part; a recessed groove cooperating with the press-embedded part is opened on the core shaft; the elastic part includes an elastic ring, and a plurality of elastic arms are arranged on the elastic ring; when the press-embedded part contacts the outer circumferential side wall of the core shaft, the engaging transmission part is in a pressed-down state and cannot transmit; when the press-embedded part is opposite to the recessed groove, the elastic arm presses the press-embedded part into the recessed groove, so that the engaging transmission part rotates to a lifted state, thereby realizing transmission.

[0026] In summary, the present invention has the following beneficial effects:

[0027] 1. The central variable speed motor of the present invention integrates the speed change mechanism and the gear change drive mechanism, separates the gear change drive mechanism from the speed change mechanism, and then realizes the gear switching by means of transmission connection, which can simplify the structure of the speed change mechanism, reduce the difficulty of its processing and assembly, and facilitate the assembly and processing of the entire motor, and reduce the difficulty of later maintenance;

[0028] 2. The gear-shifting drive mechanism uses a gear-shifting motor to achieve automatic adjustment of the gear position, which can match the automatic control of the motor to achieve centralized control, making it easier for riders to operate and thus improving the riding experience;

[0029] 3. The mid-mounted variable speed motor of the present invention not only includes three forward gears, but also has a reverse gear and a neutral gear. It can be used not only on power-assisted bicycles but also on power-assisted transport vehicles, and has a wide range of applications and high economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of a mid-mounted variable speed motor in an embodiment Figure 1 ;

[0031] Figure 2 A schematic diagram of the structure of a mid-mounted variable speed motor in an embodiment Figure 2 ;

[0032] Figure 3 It is a structural schematic diagram of the central shaft mechanism and the speed change mechanism in the embodiment;

[0033] Figure 4 This is a schematic diagram of the structure of the power-assisting driving mechanism in the embodiment;

[0034] Figure 5 An exploded schematic diagram of the power-assist driving mechanism in the embodiment;

[0035] Figure 6 It is a schematic diagram of the structure of the speed change mechanism and the gear change drive mechanism in the embodiment;

[0036] Figure 7 A cross-sectional view of a speed change mechanism and a gear change drive mechanism in an embodiment;

[0037] Figure 8 The structure of the gear shift drive mechanism in the embodiment is shown in FIG. Figure 1 ;

[0038] Fig. 9 The structure of the gear shift drive mechanism in the embodiment is shown in FIG. Figure 2 ;

[0039] Fig.10 An exploded schematic diagram of some components of the speed change mechanism in the embodiment;

[0040] Fig.11 It is a planar development schematic diagram of the speed change shaft sleeve in the embodiment;

[0041] Fig.12 It is a schematic diagram of the plane development of the mandrel in the embodiment;

[0042] Fig.13 It is a planar development schematic diagram of the speed change shaft sleeve and the core shaft when the reverse gear is engaged in the embodiment;

[0043] Fig.14 It is a schematic diagram of the plane development of the speed change shaft sleeve and the core shaft when the gear is in neutral in the embodiment;

[0044] Fig.15 It is a planar development schematic diagram of the speed change shaft sleeve and the core shaft in the first gear in the embodiment;

[0045] Fig.16 It is a planar development schematic diagram of the speed change shaft sleeve and the core shaft in the second gear in the embodiment;

[0046] Fig.17 It is a planar development schematic diagram of the speed change shaft sleeve and the core shaft when the third gear is in the embodiment.

[0047] In the figure: 1, middle shaft mechanism; 11, middle shaft; 12, middle shaft pedal input gear; 13, middle shaft output sleeve; 131, middle shaft first gear output gear; 132, middle shaft second gear output gear; 133, middle shaft third gear output gear; 134, middle shaft output spline; 2, speed change mechanism; 21, speed change sleeve; 2111, flip support part; 2112, meshing transmission part; 2113, press-fit part; 212, motor forward ratchet; 213, motor reverse pawl; 214, pedal input pawl; 215, third gear pawl; 216, second gear pawl; 217, first gear pawl; 218, reverse gear pawl; 22, spindle; 221, motor sink; 222, pedal sink; 223, third gear sink; 224, second gear sink; 225, first gear sink; 231, power transmission input gear; 232, pedal transmission input gear; 241, first gear transmission output Gear; 242, second gear speed output gear; 243, third gear speed output gear; 251, spindle drive gear; 252, sleeve drive gear; 26, elastic ring; 261, elastic arm; 3, power-assisted driving mechanism; 31, movement assembly; 311, movement shaft; 312, power-assisted sun gear; 321, power-assisted planetary carrier; 322, first power-assisted planetary gear; 323, second power-assisted planetary gear; 324, power-assisted inner gear ring; 325, positioning ring; 33, power-assisted output gear; 4, shift driving mechanism; 41, shift motor; 411, drive sleeve; 42, shift planetary carrier; 43, first shift sun gear; 44, second shift sun gear; 45, second shift planetary gear; 46, first shift planetary gear; 47, second shift inner gear ring; 471, second outer gear; 48, first shift inner gear ring; 481, first outer gear; 5, transmission mechanism. DETAILED DESCRIPTION

[0048] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0049] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0050] Example:

[0051] A mid-mounted variable speed motor, referring to Figure 1 and Figure 2 , which includes a central axis mechanism 1, a speed change mechanism 2, a power-assisted driving mechanism 3 and a gear change driving mechanism 4; in this embodiment, the four working mechanisms are all independent module units, and the various mechanisms are connected through transmission, which is convenient for production and assembly, as well as subsequent maintenance; wherein the speed change mechanism 2 is separated from the gear change driving mechanism 4, which can simplify the structure of the speed change mechanism 2; in this embodiment, a transmission mechanism 5 is also provided between the power-assisted driving mechanism 3 and the speed change mechanism 2, specifically, the transmission mechanism 5 is an idler wheel assembly, and the transmission mechanism 5 is used to transmit the rotation speed, which is convenient for optimizing the size and the overall layout; in other optional embodiments, the transmission mechanism 5 can also use a synchronous belt, or cancel the transmission mechanism 5, and directly transmit the power-assisted driving mechanism 3 and the speed change mechanism 2, which is not limited here.

[0052] Reference Figure 3 The middle shaft mechanism 1 includes a middle shaft 11, on which a middle shaft pedal input gear 12 and a middle shaft output sleeve 13 are respectively sleeved; wherein, the middle shaft pedal input gear 12 and the middle shaft 11 are circumferentially linked by keyway cooperation, and both ends of the middle shaft 11 are connected to the pedals, thereby converting the pedal power into the rotation speed of the middle shaft pedal input gear 12; a bearing is arranged between the middle shaft output sleeve 13 and the middle shaft 11, so that the rotation speed of the middle shaft 11 will not be transmitted to the middle shaft output sleeve 13; a plurality of middle shaft output gears are arranged on the middle shaft output sleeve 13, and in this embodiment, the motor includes three forward gears, specifically, the middle shaft output gear includes a middle shaft first gear output gear 131, a middle shaft second gear output gear 132 and a middle shaft third gear output gear 133; a middle shaft output spline 134 is arranged at the end of the outer wall of the middle shaft output sleeve 13, and the middle shaft output spline 134 is located on the outer side of the motor, and is used to connect the sprocket to output the rotation speed and drive the vehicle forward.

[0053] Reference Figure 3 and Figure 5 The power-assisted driving mechanism 3 includes a core assembly 31 and a power-assisted reduction assembly connected to the core assembly 31. A power-assisted output gear 33 is provided on the power-assisted reduction assembly, and the core assembly 31 and the power-assisted reduction assembly are respectively located on both sides of the power-assisted output gear 33; in this embodiment, the power-assisted output gear 33 is arranged in the middle position of the entire power-assisted driving mechanism 3, so as to optimize the axial size of the motor.

[0054] Reference Figure 3 and Figure 5Specifically, the power-assisted reduction assembly includes a power-assisted planetary carrier 321, power-assisted planetary wheels and a power-assisted inner gear ring 324. The movement assembly 31 includes a movement shaft 311, and a power-assisted sun gear 312 is arranged on the movement shaft 311. In this embodiment, the power-assisted planetary wheels include a first power-assisted planetary wheel 322 meshed with the power-assisted sun gear 312, and a second power-assisted planetary wheel 323 meshed with the power-assisted inner gear ring 324. The first power-assisted planetary wheel 322 cooperates with the second power-assisted planetary wheel 323 to achieve a higher reduction ratio within a limited space size.

[0055] Reference Figure 3 and Figure 5 In this embodiment, the movement assembly 31 includes a stator and a rotor, and the movement shaft 311 is connected to the rotor for outputting the rotation speed; the power-assisted sun gear 312 and the movement shaft 311 are integrally formed, which can simplify the structure, reduce the assembly process, and reduce the cost; in this embodiment, the power-assisted inner gear ring 324 is fixedly connected to the motor housing (not shown in the drawings), and after the movement shaft 311 rotates, the power-assisted planetary carrier 321 is driven to rotate through the power-assisted sun gear 312 and the power-assisted planetary gear, and the power-assisted output gear 33 is connected to the power-assisted planetary carrier 321 to realize the power-assisted rotation speed output.

[0056] Reference Figure 3 and Figure 5 In this embodiment, a positioning ring 325 is extended from the end face of the power-assisting planetary carrier 321 opposite to the movement assembly 31, and the power-assisting output gear 33 is sleeved on the positioning ring 325 and can be linked with the positioning ring 325 in the circumferential direction; in this embodiment, the power-assisting output gear 33 and the positioning ring 325 are linked in the circumferential direction through keyway cooperation, specifically spline cooperation, which can of course be replaced by flat key cooperation; in other optional embodiments, the power-assisting output gear 33 and the positioning ring 325 can also be linked in the circumferential direction by fixed connection or integral molding, and the fixed connection can be achieved by interference fit or welding.

[0057] Reference Figure 1 , Figure 3 , Figure 6 and Figure 7The speed change mechanism 2 includes a coaxially arranged core shaft 22 and a speed change shaft sleeve 21, and the core shaft 22 is inserted in the middle of the speed change shaft sleeve 21; the speed change shaft sleeve 21 is provided with a power-assisted speed change input gear 231 meshing with the transmission mechanism 5, a pedal speed change input gear 232 meshing with the middle shaft pedal input gear 12, and a speed change output gear meshing with multiple middle shaft output gears respectively; specifically, the speed change output gear includes a first-gear speed change output gear 241 meshing with the middle shaft first-gear output gear 131, a second-gear speed change output gear 242 meshing with the middle shaft second-gear output gear 132, and a third-gear speed change output gear 243 meshing with the middle shaft third-gear output gear 133; in this embodiment, the speed change mechanism 2 is provided with three forward gears, and in other optional embodiments, the number of gears can also be adjusted, which is not limited here.

[0058] Reference Figure 6 and Figure 7 The gear shift drive mechanism 4 includes a speed superposition execution component that is transmission-connected to the core shaft 22 and the gear shift sleeve 21, and a gear shift motor 41 for controlling the speed superposition execution component. The gear shift motor 41 can realize automatic control and adjustment of the gear position, which can match the automatic control of the motor to realize centralized control; specifically, the gear position can be adjusted by buttons or touch on the control panel of the motor, which is easy to operate and improves the riding experience.

[0059] Reference Figure 6 and Figure 7 Specifically, the speed superposition execution component includes a shift planetary carrier 42, a first shift sun gear 43, a second shift sun gear 44, a first shift internal gear ring 48 and a second shift internal gear ring 47; a first shift planetary gear 46 cooperating with the first shift sun gear 43 and the first shift internal gear ring 48 is provided on one side of the shift planetary carrier 42, and a second shift planetary gear 45 cooperating with the second shift sun gear 44 and the second shift internal gear ring 47 is provided on the other side; the speed change shaft sleeve 21 is connected with a shaft sleeve driving member linked to the circumferential direction, and the core shaft 22 is connected with a core shaft driving member linked to the circumferential direction; the first shift internal gear ring 48 cooperates with the core shaft driving member to transmit the speed, and the second shift internal gear ring 47 cooperates with the shaft sleeve driving member to transmit the speed.

[0060] Reference Figure 6 and Figure 7, the second gear shift sun gear 44 is fixed, and a drive shaft sleeve 411 connected to the first gear shift sun gear 43 is provided on the gear shift motor 41; specifically, in this embodiment, the second gear shift sun gear 44 is connected to the motor inner bracket (not shown in the drawings) to achieve fixation, and the first gear shift sun gear 43 is sleeved on the drive shaft sleeve 411, and the two are linked in the circumferential direction; specifically, a non-circular drive hole matching the drive shaft sleeve 411 is provided in the first gear shift sun gear 43, and the drive hole in this embodiment is an inner hexagonal hole, so that for assembly and disassembly; in other optional embodiments, the first shift sun gear 43 and the driving shaft sleeve 411 can also be connected by means of keyway matching, etc., which is not limited here; in this embodiment, the driving shaft sleeve 411 passes through the shift planetary carrier 42 and the second shift sun gear 44, and there is a clearance fit between the driving shaft sleeve 411 and the shift planetary carrier 42, and between the driving shaft sleeve 411 and the second shift sun gear 44; in this embodiment, the shift motor 41 and the speed change shaft sleeve 21 are arranged on the same side to facilitate the control of the axial size of the motor.

[0061] Reference Figures 7 to 9 In this embodiment, the spindle driving member is a spindle driving gear 251, and the outer wall of the first shift inner gear ring 48 is provided with a first outer tooth portion 481 meshing with the spindle driving gear 251; the sleeve driving member is a sleeve driving gear 252, and the outer wall of the second shift inner gear ring 47 is provided with a second outer tooth portion 471 meshing with the sleeve driving gear 252; in this embodiment, the transmission between the first shift inner gear ring 48 and the spindle driving member, and between the second shift inner gear ring 47 and the sleeve driving member is directly achieved through gear meshing. In other optional embodiments, transmission can also be achieved by using a synchronous belt or chain, etc., which is not limited here.

[0062] Reference Figures 6 to 9When the shift motor 41 is not powered, its output shaft has a relatively large rotation resistance, so at this time the first shift sun gear 43 is in a locked state; the speed change shaft sleeve 21 is driven to rotate by an external force, which drives the shaft sleeve driving gear 252 to rotate, and the shaft sleeve driving gear 252 drives the second shift internal gear ring 47 to rotate, and the second shift internal gear ring 47 drives the second shift planetary gear 45 and the shift planetary carrier 42 to rotate; since the second shift sun gear 44 is fixed and the first shift sun gear 43 is in a locked state, the first shift planetary gear 46 can only drive the first shift internal gear ring 48 to rotate, and the first shift internal gear ring 48 is driven by the first shift planetary gear 46 to rotate. The spindle driving gear 251 drives the spindle 22 to rotate, realizing the synchronous rotation of the speed change shaft sleeve 21 and the spindle 22; the shift motor 41 drives the first shift sun gear 43 to rotate a certain angle, and the first shift internal gear ring 48 and the second shift internal gear ring 47 realize the corresponding differential according to the speed ratio of the planetary reduction mechanism, thereby realizing the differential between the spindle 22 and the speed change shaft sleeve 21, thereby realizing gear shifting; in this embodiment, in order for the shift motor 41 to realize fast and accurate rotation angle, a rotary transformer, Hall circuit or the like can be used to detect the relative angle between the spindle 22 and the speed change shaft sleeve 21 or the rotation angle output by the shift motor 41.

[0063] Reference Figure 6 , Fig.10 and Fig.11 The speed change mechanism 2 also includes a speed change drive assembly for realizing speed transmission; specifically, the speed change drive assembly includes a plurality of ratchets and elastic members, the ratchets include a motor forward ratchet 212 and a motor reverse ratchet 213 that cooperate with the power-assisted speed change input gear 231, a pedal input ratchet 214 that cooperates with the pedal speed change input gear 232, and output ratchets that cooperate with a plurality of speed change output gears respectively; specifically, the output ratchets include a first gear ratchet 217 and a reverse gear ratchet 218 that cooperate with the first gear speed change output gear 241, a second gear ratchet 216 that cooperates with the second gear speed change output gear 242, and a third gear ratchet 215 that cooperates with the third gear speed change output gear 243.

[0064] Reference Fig.10 The pawl is embedded in the speed change shaft sleeve 21, which includes a flip support portion 2111, an engagement transmission portion 2112 and a press-fit portion 2113; a recessed groove matching the press-fit portion 2113 is provided on the core shaft 22; in this embodiment, the elastic member includes an elastic ring 26 arranged between the core shaft 22 and the speed change shaft sleeve 21, and a plurality of elastic arms 261 are arranged on the elastic ring 26; when the press-fit portion 2113 contacts the outer circumferential side wall of the core shaft 22, the engagement transmission portion 2112 is in a pressed down state and cannot transmit; when the press-fit portion 2113 is opposite to the recessed groove, the elastic arm 261 presses the press-fit portion 2113 into the recessed groove, so that the engagement transmission portion 2112 rotates to a lifted state, and transmission can be realized.

[0065] Reference Fig.11 and Fig.12 Specifically, the grooves on the core shaft 22 include a motor groove 221 that cooperates with the motor forward pawl 212 and the motor reverse pawl 213, a pedal groove 222 that cooperates with the pedal input pawl 214, a first gear groove 225 that cooperates with the first gear pawl 217 and the reverse gear pawl 218, a second gear groove 224 that cooperates with the second gear pawl 216, and a third gear groove 223 that cooperates with the third gear pawl 215.

[0066] Reference Figure 6 as well as Figures 11 to 17 , the working process of the speed change mechanism 2 is described, specifically:

[0067] Fig.13 The pressed part of the middle motor reverse pawl 213 is embedded in the motor groove 221 and is in a pop-up state. The pressed part of the reverse gear pawl 218 is embedded in the first gear groove 225 and is in a pop-up state. The other pawls are all in a pressed down state and cannot transmit. At this time, the power-assisted speed change input gear 231 drives the first gear speed change output gear 241 to rotate, and the motor is in the reverse gear, and the vehicle is driven to reverse through the electric power-assisted input.

[0068] Fig.14 The pressed part of the middle motor reverse pawl 213 is embedded in the motor recess 221 and is in a pop-up state, while the other pawls are in a pressed-down state and cannot transmit. At this time, the motor is in neutral, that is, the electric power input cannot drive the vehicle to move.

[0069] Fig.15 The pressing part of the middle motor forward pawl 212 is embedded in the motor recessed groove 221 and is in a pop-up state. The pressing part of the pedal input pawl 214 is embedded in the pedal recessed groove 222 and is in a pop-up state. The pressing part of the first gear pawl 217 is embedded in the first gear recessed groove 225. The remaining pawls are all in a pressed down state and cannot transmit. At this time, the motor is in the first forward gear, and the vehicle is driven forward by electric power input or pedal input. Fig.16 The pressing part of the middle second gear pawl 216 is embedded in the second gear recessed groove 224 and is in a spring-up state. At this time, the motor is in the second forward gear, and the vehicle is driven forward by electric power input or pedal input; Fig.17 The pressing part of the middle third gear pawl 215 is embedded in the third gear recessed groove 223 and is in a pop-up state. At this time, the motor is in the third forward gear, and the vehicle is driven forward by electric power input or pedal input.

[0070] Here’s how it works:

[0071] The central speed-changing motor in this embodiment integrates the speed-changing mechanism 2 and the gear-changing drive mechanism 4, separates the gear-changing drive mechanism 4 from the speed-changing mechanism 2, and then realizes the gear switching through a transmission connection. This can simplify the structure of the speed-changing mechanism 2 and reduce its processing and assembly difficulty. At the same time, it is easy to realize the assembly and processing of the entire motor and reduce the difficulty of later maintenance.

[0072] The gear-shift drive mechanism 4 uses a gear-shift motor 41 to achieve automatic adjustment of the gear position, which can be matched with the automatic control of the motor to achieve centralized control, facilitate the operation of the rider, and thus improve the riding experience.

Claims

1. A mid-mounted variable speed motor, comprising: A middle shaft mechanism, the middle shaft mechanism comprising a middle shaft pedal input gear and a middle shaft output sleeve, the middle shaft output sleeve being provided with a plurality of middle shaft output gears; A speed change mechanism, the speed change mechanism comprising a coaxially arranged core shaft and a speed change sleeve, the speed change sleeve being provided with a power-assisted speed change input gear, a pedal speed change input gear meshing with the middle shaft pedal input gear, and a speed change output gear respectively meshing with a plurality of the middle shaft output gears, the speed change mechanism further comprising a speed change drive assembly for realizing speed transmission; It is characterized by further comprising: A power-assisted driving mechanism, the power-assisted driving mechanism comprising a power-assisted output gear that is driven by the power-assisted speed-changing input gear; and A gear shift drive mechanism, the gear shift drive mechanism comprising a speed superposition actuator assembly drivingly connected to the spindle and the speed change sleeve, and a gear shift motor for controlling the speed superposition actuator assembly; The speed superposition execution assembly includes a shift planet carrier, a first shift sun gear, a second shift sun gear, a first shift internal gear ring, and a second shift internal gear ring; one side of the shift planet carrier is provided with a first shift planet gear that cooperates with the first shift sun gear and the first shift internal gear ring, and the other side is provided with a second shift planet gear that cooperates with the second shift sun gear and the second shift internal gear ring; The second gear-changing sun gear is fixed, and the gear-changing motor is provided with a driving shaft sleeve connected to the first gear-changing sun gear; The speed change shaft sleeve is connected to a shaft sleeve driving member that is linked to it in the circumferential direction, and the core shaft is connected to a core shaft driving member that is linked to it in the circumferential direction; the first shift internal gear ring cooperates with the core shaft driving member to transmit the rotation speed, and the second shift internal gear ring cooperates with the shaft sleeve driving member to transmit the rotation speed; The variable speed drive assembly includes a plurality of pawls and an elastic member.

2. The mid-mounted variable speed motor according to claim 1, characterized in that: The power-assisted driving mechanism includes a core assembly and a power-assisted reduction assembly connected to the core assembly, the power-assisted output gear is connected to the power-assisted reduction assembly, and the core assembly and the power-assisted reduction assembly are respectively located on both sides of the power-assisted output gear.

3. The mid-mounted variable speed motor according to claim 2, characterized in that: The power-assisted reduction assembly includes a power-assisted planetary carrier, a power-assisted planetary wheel and a power-assisted inner gear ring. The movement assembly includes a movement shaft, on which a power-assisted sun wheel is arranged. The power-assisted planetary wheel includes a first power-assisted planetary wheel meshed with the power-assisted sun wheel, and a second power-assisted planetary wheel meshed with the power-assisted inner gear ring. The power-assisted output gear is connected to the power-assisted planetary carrier to output the power-assisted rotational speed.

4. The mid-mounted variable speed motor according to claim 3, characterized in that: A positioning ring is extended from the end surface of the power-assisting planetary carrier opposite to the core assembly, and the power-assisting output gear is sleeved on the positioning ring and can be linked with the positioning ring in the circumferential direction.

5. The mid-mounted variable speed motor according to claim 1, characterized in that: The rotation speed is transmitted between the first gear-changing inner gear ring and the core shaft driving member, and between the second gear-changing inner gear ring and the sleeve driving member through a synchronous belt.

6. The mid-mounted variable speed motor according to claim 1, characterized in that: The spindle drive member is a spindle drive gear, and the outer side wall of the first shift inner gear ring is provided with a first outer tooth portion meshing with the spindle drive gear; the sleeve drive member is a sleeve drive gear, and the outer side wall of the second shift inner gear ring is provided with a second outer tooth portion meshing with the sleeve drive gear.

7. The mid-mounted variable speed motor according to claim 1, characterized in that: The driving shaft sleeve passes through the shift planet carrier and the second shift sun gear, and there is clearance fit between the driving shaft sleeve and the shift planet carrier, and between the driving shaft sleeve and the second shift sun gear.

8. The mid-mounted variable speed motor according to any one of claims 1 to 4, characterized in that: The pawls include a motor forward pawl and a motor reverse pawl matched with the power-assisted speed-change input gear, a pedal input pawl matched with the pedal speed-change input gear, and output pawls respectively matched with a plurality of speed-change output gears.

9. The mid-mounted variable speed motor according to claim 8, characterized in that: The pawl is embedded in the speed change shaft sleeve, and includes a flip support part, a meshing transmission part and a press-fit part; a recessed groove cooperating with the press-fit part is opened on the core shaft; the elastic member includes an elastic ring, and a plurality of elastic arms are arranged on the elastic ring; when the press-fit part contacts the outer circumferential side wall of the core shaft, the meshing transmission part is in a pressed-down state and cannot transmit; when the press-fit part is opposite to the recessed groove, the elastic arm presses the press-fit part into the recessed groove, so that the meshing transmission part rotates to a lifted state to realize transmission.

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