Coaxial hub gear motor
By using the design of using the central shaft of the high-speed motor to share the same central shaft with the hub in the hub, and driving the hub rotation through the secondary reduction gear, the shortcomings of the existing hub reduction motor in terms of reduction ratio and torque output are solved, and efficient reduction and large torque output are achieved.
Patent Information
- Application Number
- CN202510129797.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-05
- Publication Date
- 2025-03-28
AI Technical Summary
The existing hub reducer motors have shortcomings in the reduction ratio and torque output, especially the reduction ratio of coaxial planetary gear reducer motors is small and noise-free, while the small diameter of the stator and rotor of the secondary gear reducer motors of different axes affects the torque output.
The design method of sharing the central shaft and the hub of the high-speed motor share the same central shaft, and the hub is driven to rotate through the secondary reduction gear, making full use of the internal space of the hub, and the installation of the rotor and stator of the large-diameter motor is realized.
A hub reduction motor with a reduction ratio greater than 1:8, a compact structure, a small size and a large torque is realized, which solves the problem of insufficient reduction ratio and torque output in the prior art.
Smart Images
Figure CN119727228A_ABST
Abstract
Description
Technical Field
[0001] The invention discloses a coaxial wheel hub reduction motor, which belongs to the field of electric vehicle accessories and relates to a reduction motor in which a motor center axis is coaxial with a wheel hub center axis. Background Art
[0002] Wheel hub reduction motor, a reduction motor installed inside the wheel hub. Wheel hub reduction motors are usually divided into coaxial planetary gear reduction motors and non-coaxial two-stage gear reduction motors. The advantages of coaxial planetary gear reduction motors are compact structure and small size, and the disadvantages are small reduction ratio, high noise, and the reduction ratio is generally less than 1:6. The advantages of non-coaxial two-stage gear reduction motors are reduction ratio greater than 1:8, compact structure and high torque, and the disadvantages are small diameters of stator coils and rotors that affect motor torque. Therefore, there is a need for a high-speed motor with large diameter stator coils and rotors, a reduction ratio greater than 1:8, a compact structure and high torque.
[0003] Application No.: ZL2014101466263 An electric bicycle hub motor comprises a horizontally arranged main shaft, a hub shell rotatably mounted outside the main shaft, a stator and a rotor arranged in the hub shell, and a gear reduction mechanism, wherein the stator is fixed on the main shaft, and the gear reduction mechanism comprises a rotor gear fixed with the rotor and coaxially sleeved outside the main shaft, a planetary carrier fixed on the main shaft, a planetary shaft rotatably penetrated on the planetary carrier, a left planetary gear and a right planetary gear fixed on the planetary shaft, and a sun gear fixed with the hub shell and coaxially sleeved outside the main shaft, wherein the left planetary gear meshes with the rotor gear, and the right planetary gear meshes with the sun gear. The hub motor of the present invention has a large output torque and has an internal speed change function.
[0004] Application number: ZL2023214720214 A reduction device for an electric vehicle wheel hub reduction motor, wherein the wheel hub middle shaft is connected to the wheel hub end cover and the high-speed motor, the wheel hub end cover is fixedly connected to the one-way overrunning clutch, the one-way overrunning clutch is movably connected to the gear ring, the high-speed motor is fixedly connected to the motor housing connecting ring, the high-speed motor is connected to the primary driving gear, the high-speed motor is fixedly connected to the support shaft, the support shaft is movably connected to the primary driven gear and the secondary driving gear, the above adopts an integrated arrangement of the housing of the high-speed motor and the wheel hub middle shaft, the primary driving gear on the output shaft of the high-speed motor drives the primary driven gear to rotate, the primary driven gear drives the secondary driving gear to drive the gear ring to drive the one-way overrunning clutch to rotate, and the one-way overrunning clutch drives the wheel hub end cover and the wheel hub to rotate, the above achieves the effect of a reduction ratio greater than 7:1, a compact structure and a small size. Summary of the invention
[0005] The coaxial wheel hub reduction motor of the present invention adopts a design mode in which the middle shaft of the high-speed motor and the wheel hub share a common middle shaft. The high-speed motor drives the wheel hub to rotate through a secondary reduction gear, which makes full use of the space inside the wheel hub, realizes the installation of a large diameter motor rotor and motor stator, and has a compact structure and a small volume.
[0006] The technical solution of the present invention is as follows: a coaxial wheel hub reduction motor comprises a wheel hub 1, a steel ring 4 is installed on the outside of the wheel hub 1, a wheel hub left end cover and a wheel hub right end cover 2 are installed on the left and right sides of the wheel hub 1, respectively, the wheel hub left end cover and the wheel hub right end cover 2 are installed on the wheel hub center shaft 3 through bearings, a motor stator 5, a motor right end cover 6, a motor left end cover 7, a bracket 8, a primary driving gear 9, a primary driven gear 10, a secondary driving gear 11, a secondary gear support shaft 12, a motor rotor 13, and a sliding gear 14 are installed inside the wheel hub 1, and a motor left end cover 7 is installed on the left side of the motor stator 5, and the motor left end cover 7 is fixed to the wheel hub center shaft 3 The motor right end cover 6 is installed on the right side of the motor stator 5, and a bracket 8 is arranged on the right side of the motor right end cover 6, and the bracket 8 is fixedly connected to the wheel hub center shaft 3. A secondary gear support shaft 12 is installed on the right side of the motor right end cover 6, and a primary driven gear 10 and a secondary driving gear 11 are installed on the secondary gear support shaft 12. The motor rotor 13 is installed inside the motor stator 5, and a primary driving gear 9 is installed on the right side of the motor rotor 13. A sliding gear 14 is installed on the left side of the wheel hub right end cover 2, and the primary driving gear 9 is meshed with the primary driven gear 10, and the secondary driving gear 11 is meshed with the sliding gear 14.
[0007] Furthermore, the wheel hub 1 is cylindrical, the steel ring 4 installed in the center of the outer circle is annular, the center of the surface of the steel ring 4 is U-shaped, and the left end cover and the right end cover 2 installed on the left and right sides of the wheel hub 1 are both disc-shaped.
[0008] Furthermore, the motor stator 5 is annular, and the motor right end cover 6 and motor left end cover 7 installed on the left and right sides are oppositely arranged in a basin shape, and the center of the motor left end cover 7 is connected to the spline shaft in the center of the left side of the hub center shaft 3 through a spline hole.
[0009] Furthermore, the bracket 8 installed in the center of the right side of the right end cover 6 of the motor is U-shaped, and a D-shaped support plate is set on the right side of the bracket 8. The center of the support plate is connected to the spline shaft in the center of the right side of the hub center shaft 3 through a spline hole.
[0010] Furthermore, the secondary gear support shaft 12 is cylindrical and is transversely arranged at the center above the right side surface of the right end cover 6 of the motor, and a bearing is installed inside the secondary gear support shaft 12.
[0011] Furthermore, the right side of the secondary driving gear 11 is a gear and the left side is cylindrical. The left side of the secondary driving gear 11 is arranged inside the center of the disc-shaped primary driven gear 10. The left side of the primary driven gear 10 is cylindrical and installed in the bearing inside the secondary gear support shaft 12.
[0012] Furthermore, the motor rotor 13 is cylindrical and is installed in the middle of the hub shaft 3 through 1-2 bearings. The first-stage driving gear 9 installed on the right side of the motor rotor 13 is cylindrical and extends to the right to the inside of the bracket 8.
[0013] Furthermore, a sleeve is installed extending to the left from the center of the left side of the right end cover 2 of the hub, and the external thread on the outside of the sleeve is locked with the internal thread on the inside of the disc-shaped sliding gear 14.
[0014] Furthermore, the outer diameter of the motor stator 5 is greater than 180 mm, and the outer diameter of the motor rotor 13 is greater than 110 mm.
[0015] Furthermore, the speed ratio between the primary driving gear 9 and the primary driven gear 10 is greater than 1:2, and the speed ratio between the secondary driving gear 11 and the sliding gear 14 is greater than 1:2.2.
[0016] Beneficial effects: The advantages of coaxial planetary gear reduction motors are compact structure and small size, while the disadvantages are small reduction ratio, high noise, and reduction ratio generally less than 1:6. The advantages of non-coaxial two-stage gear reduction motors are reduction ratio greater than 1:8, compact structure and high torque, while the disadvantages are small diameters of stator coils and rotors that affect motor torque.
[0017] A coaxial wheel hub reduction motor adopts a design in which the central axis of the high-speed motor and the wheel hub share a common central axis. The high-speed motor drives the wheel hub to rotate through a secondary reduction gear, which fully utilizes the space inside the wheel hub, enables the installation of a large diameter motor rotor and motor stator, and has a compact structure and small size. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to further illustrate the technical solution of the present invention, the drawings required for use are briefly described below. The drawings in the following description are only some schematic diagrams of the present invention. For those skilled in the art, more drawings can be obtained by combining these drawings without creativity.
[0019] Figure 1 It is a front view of a coaxial hub reduction motor; Figure 2 It is a schematic diagram of the structure of the hub center shaft, motor stator, motor right end cover, motor left end cover, bracket, primary driving gear, primary driven gear, and secondary driving gear, which is tilted 45° to the right in the front direction; Figure 3 This is a schematic diagram of the structure of the right end cover, bracket, and secondary gear support shaft of the motor, with the front direction tilted 45° to the right; Figure 4 This is a schematic diagram of the structure of the hub center shaft, the first-stage driving gear, and the front direction of the motor rotor tilted 45° to the right; Figure 5 It is a 45° structural diagram of the left side of the right end cover of the hub and the sliding gear; In the figure, 1 is the wheel hub, 2 is the right end cover of the wheel hub, 3 is the middle shaft of the wheel hub, 4 is the steel ring, 5 is the motor stator, 6 is the right end cover of the motor, 7 is the left end cover of the motor, 8 is the bracket, 9 is the primary driving gear, 10 is the primary driven gear, 11 is the secondary driving gear, 12 is the secondary gear support shaft, 13 is the motor rotor, and 14 is the sliding gear. DETAILED DESCRIPTION
[0020] The structure and shape of the present invention are described in detail with reference to the accompanying drawings and reference numerals: Embodiment 1
[0021] See attached Figure 1-5A coaxial wheel hub reduction motor comprises a wheel hub 1, the wheel hub 1 is used to support a steel ring 4 and to install a right end cover 2 and a left end cover of the wheel hub, the outside of the wheel hub 1 is installed with a steel ring 4, the steel ring 4 is used to install a tire, the left end cover and the right end cover 2 of the wheel hub are installed on the left and right sides of the wheel hub 1, respectively, the left end cover and the right end cover 2 of the wheel hub are used to support the wheel hub 1, the left end cover and the right end cover 2 of the wheel hub are respectively installed on the upper side of the wheel hub center shaft 3 through bearings, the wheel hub center shaft 3 is used to support the left end cover and the right end cover 2 of the wheel hub and support the right end cover 6 of the motor and the left end cover 7 of the motor, the inside of the wheel hub 1 is installed with a motor stator 5, a motor right end cover 6, a motor left end cover 7, a bracket 8, a primary driving gear 9, a primary driven gear 10, a secondary driving gear 11, a secondary gear support shaft 12, a motor rotor 13, and a sliding gear 14, the left end cover 7 of the motor is installed on the left side of the motor stator 5, the left end cover 7 of the motor is fixedly connected to the center shaft 3 of the wheel hub, the motor stator 5 is used to generate a magnetic field in coordination with the coil, the left end cover 7 of the motor is used to support the motor stator 5, the right end cover 6 of the motor is installed on the right side of the motor stator 5, and the motor The right end cover 6 is used to support the motor stator 5. A bracket 8 is arranged on the right side of the motor right end cover 6. The bracket 8 is fixedly connected to the hub center shaft 3. The bracket 8 is used to support the motor right end cover 6. A secondary gear support shaft 12 is installed on the right side of the motor right end cover 6. The secondary gear support shaft 12 is used to install a primary driven gear 10 and a secondary driving gear 11. A primary driven gear 10 and a secondary driving gear 11 are installed on the secondary gear support shaft 12. The primary driven gear 10 is used to drive the secondary driving gear 11 to rotate. The motor rotor 13 is installed Inside the motor stator 5, the motor rotor 13 is used to drive the primary driving gear 9 to rotate. The right side of the motor rotor 13 is installed with the primary driving gear 9, and the primary driving gear 9 is used to drive the primary driven gear 10 to rotate. The left side of the right end cover 2 of the wheel hub is installed with a sliding gear 14, and the sliding gear 14 is used to drive the right end cover 2 of the wheel hub to rotate. The primary driving gear 9 is meshed with the primary driven gear 10, and the secondary driving gear 11 is meshed with the sliding gear 14, and the secondary driving gear 11 is used to drive the sliding gear 14 to rotate.
[0022] See attached Figure 1 The wheel hub 1 is cylindrical, the steel ring 4 installed in the center of the outer circle is annular, the center of the surface of the steel ring 4 is U-shaped, and the left end cover and the right end cover 2 installed on the left and right sides of the wheel hub 1 are both disc-shaped.
[0023] See attached Figure 2 The motor stator 5 is annular, and the motor right end cover 6 and the motor left end cover 7 installed on the left and right sides are in a basin shape arranged opposite to each other. The center of the motor left end cover 7 is connected to the spline shaft in the center of the left side of the hub center shaft 3 through a spline hole.
[0024] See attached Figure 2 and 3 The bracket 8 installed in the center of the right side of the right end cover 6 of the motor is U-shaped, and a D-shaped support plate is set on the right side of the bracket 8. The center of the support plate is connected to the spline shaft in the center of the right side of the hub center shaft 3 through a spline hole.
[0025] See attached Figure 3 The secondary gear support shaft 12 is cylindrical and is transversely arranged at the center above the right side surface of the right end cover 6 of the motor. A bearing is installed inside the secondary gear support shaft 12.
[0026] See attached Figure 2 The right side of the secondary driving gear 11 is a gear and the left side is cylindrical. The left side of the secondary driving gear 11 is arranged inside the center of the disc-shaped primary driven gear 10. The left side of the primary driven gear 10 is cylindrical and installed in the bearing inside the secondary gear support shaft 12.
[0027] See attached Figure 2 and 4 The motor rotor 13 is cylindrical and is installed in the middle of the hub shaft 3 through 1-2 bearings. The first-stage driving gear 9 installed on the right side of the motor rotor 13 is cylindrical and extends to the right to the inside of the bracket 8.
[0028] See attached Figure 5 A sleeve is installed in the center of the left side of the right end cover 2 of the hub, extending to the left, and the external thread of the sleeve is locked with the internal thread of the disc-shaped sliding gear 14.
[0029] See attached Figure 2 and 4 The outer diameter of the motor stator 5 is greater than 180 mm, and the outer diameter of the motor rotor 13 is greater than 110 mm.
[0030] See attached Figure 2 , 4 5. The speed ratio between the primary driving gear 9 and the primary driven gear 10 is greater than 1:2, and the speed ratio between the secondary driving gear 11 and the sliding gear 14 is greater than 1:2.2. Embodiment 2
[0031] A coaxial hub reduction motor, the bracket 8 installed in the center of the right side of the right end cover 6 of the motor is U-shaped, a circular bearing sleeve is installed on the left side of the bracket 8, a D-shaped support plate is set on the right side of the bracket 8, the center of the support plate is connected to the spline shaft in the center of the right side of the hub center shaft 3 through a spline hole, and a bearing is installed on the surface of the connection part of the left side of the first-stage driving gear 9 with the motor rotor 13, and the bearing is set in the bearing sleeve on the left side of the bracket 8. Embodiment 3
[0032] A coaxial hub reduction motor, wherein a secondary gear support shaft 12 is cylindrical, and the first-stage driven gear 10 and the second-stage driving gear 11 are installed on the second-stage gear support shaft 12 through two bearings.
[0033] The above description is only a general disclosure of the present invention and does not limit the present invention in any form. Any adjustments, modifications and evolutions made by technicians familiar with the industry without departing from the technical solution of the present invention, implementing the above-mentioned technology and making any equivalent changes, etc., all fall within the protection scope of the technical solution of the present invention.
Claims
1. A coaxial hub reduction motor, comprising a hub, characterized in that A steel ring is installed on the outside of the wheel hub, and a left end cover and a right end cover of the wheel hub are installed on the left and right sides of the wheel hub respectively. The left end cover and the right end cover of the wheel hub are respectively installed on the top of the wheel hub central shaft through bearings. A motor stator, a right end cover of the motor, a left end cover of the motor, a bracket, a primary driving gear, a primary driven gear, a secondary driving gear, a secondary gear support shaft, a motor rotor, and a sliding gear are installed inside the wheel hub. The left end cover of the motor is installed on the left side of the motor stator, and the left end cover of the motor is fixedly connected to the central shaft of the wheel hub. The right end cover of the motor is installed on the right side of the motor stator. A bracket is set on the right side of the right end cover of the motor, and the bracket is fixedly connected to the central shaft of the wheel hub. A secondary gear support shaft is installed on the right side of the right end cover of the motor, and a primary driven gear and a secondary driving gear are installed on the top of the secondary gear support shaft. The motor rotor is installed inside the motor stator, and a primary driving gear is installed on the right side of the motor rotor. A sliding gear is installed on the left side of the right end cover of the wheel hub. The primary driving gear and the primary driven gear are meshed with each other, and the secondary driving gear and the sliding gear are meshed with each other.
2. According to claim 1, a coaxial hub reduction motor is characterized in that The wheel hub is cylindrical, the steel ring installed in the center of the outer circle is annular, the center of the steel ring surface is U-shaped, and the left end cover and the right end cover of the wheel hub installed on the left side and the right side of the wheel hub are both disc-shaped.
3. According to claim 1, a coaxial hub reduction motor is characterized in that The motor stator is annular, and the right end cover and left end cover of the motor installed on the left and right sides are oppositely arranged in a basin shape. The center of the left end cover of the motor is connected to the spline shaft in the center of the left side of the wheel hub center shaft through a spline hole.
4. The coaxial hub reduction motor according to claim 1 is characterized in that The bracket installed in the center of the right side of the right end cover of the motor is U-shaped, and a D-shaped support plate is set on the right side of the bracket. The center of the support plate is connected to the spline shaft in the center of the right side of the hub center axis through a spline hole.
5. The coaxial hub reduction motor according to claim 1, characterized in that The secondary gear support shaft is cylindrical and is transversely arranged at the center above the right side surface of the right end cover of the motor. A bearing is installed inside the secondary gear support shaft.
6. The coaxial hub reduction motor according to claim 1, characterized in that The right side of the secondary driving gear is a gear and the left side is cylindrical. The left side of the secondary driving gear is arranged inside the center of the disc-shaped primary driven gear. The left side of the primary driven gear is cylindrical and installed in the bearing inside the secondary gear support shaft.
7. The coaxial hub reduction motor according to claim 1, characterized in that The motor rotor is cylindrical and is installed in the middle of the hub center shaft through 1-2 bearings. The first-stage driving gear installed on the right side of the motor rotor is cylindrical and extends to the right to the inside of the bracket.
8. The coaxial hub reduction motor according to claim 1, characterized in that A sleeve is installed in the center of the left side of the right end cover of the wheel hub, extending to the left, and the external thread on the outside of the sleeve is locked with the internal thread on the inside of the disc-shaped sliding gear.
9. The coaxial hub reduction motor according to claim 1, characterized in that The outer diameter of the motor stator is greater than 180mm, and the outer diameter of the motor rotor is greater than 110mm.