Electric Motor Structure

Abstract

This invention discloses an electric motorcycle structure, relating to the field of electric motorcycle structure technology. The electric motorcycle motor structure includes: a hub; a motor, the motor being disposed on one axial side of the hub and used to drive the hub to rotate; wherein the hub includes: a rim; a flange seat, the flange seat being disposed at the center of the rim and spaced apart from the rim; multiple spokes, the multiple spokes being arranged in a circumferential array along the inner ring of the rim, the multiple spokes extending radially along the rim and connecting the flange seat and the rim; the motor being disposed on one axial side of the flange seat and used to drive the flange seat to rotate; the technical solution provided by this invention aims to solve the problem in the prior art where the motor body of the hub motor is disposed inside the rim, resulting in a low wading depth and susceptibility to water ingress and damage.

Description

Technical Field

[0001] This invention relates to the field of electric motorcycle technology, and in particular to an electric motorcycle motor structure. Background Technology

[0002] Electric motorcycles typically use hub motors as the rear-wheel drive structure. Existing hub motors generally include a rim and a motor housing located inside the rim. The motor housing is usually formed by the mating of cover plates on both sides of the hub, and the drive motor is entirely housed within this motor housing.

[0003] To meet the power output requirements of electric motorcycles, the drive motors in existing hub motors typically require a large installation space. The radial dimension of the drive motor is close to the inner diameter of the rim, allowing the drive motor to fill as much of the rim's inner side as possible. Since the drive motor is entirely located inside the rim, and its outer periphery is close to the inner ring of the rim, the snorkel line of the drive motor is also close to the inner ring of the rim.

[0004] When a vehicle is driving through water, the inner ring of the wheel rim is closer to the ground, making it easier for water to come into contact with or approach the sealing area of ​​the drive motor. As a result, existing hub motors have the problem of low wading depth and high risk of water damage. Over long-term use, the motor is prone to water ingress and damage due to factors such as seal aging, assembly errors, or vehicle vibration. Summary of the Invention

[0005] The main objective of this invention is to propose an electric motorcycle motor structure that addresses the problem in the prior art where the motor body of a hub motor is located inside the wheel rim, resulting in a low wading depth and susceptibility to water ingress and damage.

[0006] To achieve the above objectives, the electric motorcycle motor structure proposed in this invention includes: Wheel hub; An electric motor is disposed on one axial side of the wheel hub and is used to drive the wheel hub to rotate; The hub includes: Wheel rim; A flange seat is disposed at the axis of the wheel rim and spaced apart from the wheel rim; Multiple spokes are arranged in a circumferential array along the inner ring of the rim, and the multiple spokes extend radially along the rim and connect the flange seat to the rim. The motor is located on one axial side of the flange seat and is used to drive the flange seat to rotate.

[0007] In one embodiment, the flange seat has a first mounting cavity on one side, and a speed reducer is disposed in the first mounting cavity. The speed reducer is used to drive the flange seat to rotate the hub. The motor is disposed at one end of the speed reducer and is used to drive the speed reducer to run.

[0008] In one embodiment, the flange seat is provided with a first stepped portion, the inner wall of the first stepped portion forming the first mounting cavity, and the inner wall of the first stepped portion abutting against the output end of the reducer.

[0009] In one embodiment, the reducer is a planetary reducer, with the input end of the reducer located at the center of the side of the reducer facing the motor. A sun gear is provided on the output shaft of the motor, and the sun gear meshes with the reducer. The output shaft of the motor is connected to the reducer via the sun gear.

[0010] In one embodiment, a motor bracket is circumferentially fixedly connected to the housing of the motor, and the motor bracket is fixedly connected to the rear fork.

[0011] In one embodiment, a central shaft cavity is formed at the center of the reducer and the center of the motor. A central shaft is inserted through the central shaft cavity. One end of the central shaft is rotatably connected to the inner wall of the central shaft cavity in the motor through a bearing, and the other end of the central shaft is rotatably connected to the inner wall of the central shaft cavity in the reducer through a bearing. The two ends of the central shaft are respectively used for fixed connection to the two ends of the rear fork.

[0012] In one embodiment, the motor has a drive shaft axially inserted through it, the drive shaft is axially hollow to form the central shaft cavity of the motor, and the sun gear on the drive shaft is fixedly connected to the input end of the reducer.

[0013] In one embodiment, the motor is an axial motor, and the motor includes: case; Stator, the stator being fixedly connected to the inner wall of the housing; and The rotor is fixedly connected to the outside of the drive shaft, and the stator is circumferentially spaced from the rotor.

[0014] In one embodiment, the reducer has a mounting base on the side facing the motor, the outer edge of the mounting base abuts against the inner edge of the flange seat, and the planetary gear is disposed within the mounting base.

[0015] In one embodiment, the mounting base extends circumferentially along one end edge facing the motor bracket to form a first mounting surface, and the motor bracket extends circumferentially along one end edge facing the mounting base to form a second mounting surface; a sealed bearing is provided between the first mounting surface and the second mounting surface.

[0016] The motor 3 is located on the axial side of the wheel hub 1. Compared to the traditional hub motor structure where the motor body is located inside the wheel rim, the radial dimension of the motor 3 does not need to be close to the inner diameter of the wheel rim 13, and the sealing area of ​​the motor body can avoid the low-lying wading area near the inner ring of the wheel rim 13. When the vehicle is driving through water, the water usually contacts the lower part of the wheel rim 13 and the area near the inner ring of the wheel rim 13 first. With the motor 3 located on the axial side of the flange seat 11, the contact between the water and the motor body can be reduced. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of an embodiment of the electric motorcycle motor structure provided by the present invention; Figure 2 A cross-sectional view of the electric motorcycle motor structure provided by the present invention; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 An exploded view of the electric motor structure provided by the present invention.

[0019] Explanation of icon numbers: 1. Hub; 11. Flange seat; 1A. First mounting cavity; 12. First step; 13. Rim; 14. Spokes; 2. Speed ​​reducer; 3. Motor; 31. Mounting base; 32. Drive shaft; 33. Central shaft; 34. Sun gear.

[0020] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0024] This invention proposes a structure for an electric motorcycle hub motor.

[0025] Please see Figures 1 to 4 In one embodiment of the present invention, the electric motorcycle motor structure includes a hub 1 and a motor 3. The motor 3 is disposed on one axial side of the hub 1 and is used to drive the hub 1 to rotate. The hub 1 includes a rim 13, a flange seat 11, and a plurality of spokes 14. The rim 13 is used to mount a tire and forms the outer peripheral support structure of the rear wheel of the vehicle. The flange seat 11 is disposed at the axial center of the rim 13 and is spaced apart from the rim 13. The plurality of spokes 14 are arranged in a circumferential array along the inner ring of the rim 13, and the plurality of spokes 14 extend radially along the rim 13 and connect the flange seat 11 and the rim 13. The motor 3 is disposed on one axial side of the flange seat 11 and is used to drive the flange seat 11 to rotate.

[0026] Specifically, the flange seat 11 serves as the central transmission connection point of the hub 1, and it forms a radial connection structure with the rim 13 through multiple spokes 14. When the torque output by the motor 3 acts on the flange seat 11, the flange seat 11 transmits the torque to the rim 13 through the multiple spokes 14, causing the rim 13 and the tire mounted on the outside of the rim 13 to rotate synchronously. The multiple spokes 14 are distributed circumferentially along the rim 13, creating a multi-point force transmission path between the flange seat 11 and the rim 13, reducing localized stress concentration.

[0027] The technical solution of this invention, by positioning the motor 3 on one axial side of the wheel hub 1, compared to the traditional hub motor structure where the motor body is located inside the wheel rim, eliminates the need for the radial dimension of the motor 3 to approach the inner diameter of the wheel rim 13. Furthermore, the sealing area of ​​the motor 3 can avoid the low-lying wading area near the inner ring of the wheel rim 13. When a vehicle is wading through water, water typically first contacts the lower part of the wheel rim 13 and the area near the inner ring of the wheel rim 13. Positioning the motor 3 on the axial side of the flange seat 11 reduces the probability of water directly contacting the sealing area of ​​the motor 3.

[0028] In one embodiment of the present invention, please refer to Figure 2 and Figure 4 The flange seat 11 has a first mounting cavity 1A on one side. A reducer 2 is installed in the first mounting cavity 1A. The reducer 2 is used to drive the flange seat 11 to rotate the hub 1. The motor 3 is installed at one end of the reducer 2 and is used to drive the reducer 2 to run.

[0029] Specifically, the first mounting cavity 1A is formed on one axial side of the flange seat 11, and the reducer 2 is assembled inside the first mounting cavity 1A. The motor 3 and the reducer 2 are arranged along the axial direction of the hub 1. The power output from the motor 3 is first input to the reducer 2, and then output from the reducer 2 to the flange seat 11. The reducer 2 can reduce the output speed of the motor 3 and correspondingly increase the output torque, so that the flange seat 11 obtains a torque output suitable for the rear wheel drive of the electric motorcycle. Since the reducer 2 is set in the first mounting cavity 1A of the flange seat 11, the reducer 2 and the central area of ​​the hub 1 form an integrated arrangement, which can shorten the force transmission distance between the output end of the reducer 2 and the flange seat 11. The motor 3 is set at one end of the reducer 2, avoiding the main body of the motor 3 occupying the large diameter space inside the rim 13, so that the internal structure of the hub 1 is arranged separately from the main body of the motor 3.

[0030] In one embodiment of the present invention, please refer to Figure 2 and Figure 3 The flange seat 11 is provided with a first step portion 12, and the inner wall of the first step portion 12 surrounds to form a first mounting cavity 1A. The inner wall of the first step portion 12 abuts against the output end of the reducer 2.

[0031] Specifically, the first stepped portion 12 extends circumferentially along the flange seat 11 and forms an annular stepped structure on one side of the flange seat 11. The inner wall of the first stepped portion 12 encloses to form a first mounting cavity 1A, and at least a portion of the structure of the reducer 2 is located within the first mounting cavity 1A. The output end of the reducer 2 abuts against the inner wall of the first stepped portion 12, thereby forming a positioning and force transmission fit between the reducer 2 and the flange seat 11. This abutment relationship can limit the radial displacement of the output end of the reducer 2 relative to the flange seat 11 and enable the torque output by the reducer 2 to be transmitted to the flange seat 11 via the first stepped portion 12. Figure 3 It shows Figure 2The partial mating structure at point A provides an installation reference for the reducer 2 with the first step 12, so that the reducer 2 and the flange seat 11 maintain a coaxial or nearly coaxial assembly relationship, thereby improving the stability during power transmission.

[0032] In one embodiment of the present invention, please refer to Figures 2 to 4 The reducer 2 is a planetary reducer. The input end of the reducer 2 is located at the center of the side of the reducer 2 facing the motor 3. The output shaft of the motor 3 is provided with a sun gear 34, which meshes with the reducer 2. The output shaft of the motor 3 is connected to the reducer 2 through the sun gear 34.

[0033] Specifically, the planetary reducer may include a sun gear 34, planet gears, a planet carrier, and a ring gear, among other transmission components. The sun gear 34 is mounted on the output shaft of the motor 3 and rotates synchronously with it. The input end of the reducer 2 is located at the center of the side of the reducer 2 facing the motor 3, ensuring that the output shaft of the motor 3 corresponds to the center input position of the reducer 2. The sun gear 34 meshes with the planet gears in the reducer 2. When the output shaft of the motor 3 rotates, it drives the sun gear 34 to rotate, which in turn drives the planet gears. The planet gears then output the reduced torque to the flange seat 11 via the planet carrier or other output components. The planetary reducer features coaxial input and coaxial output, making it suitable for placement within the first mounting cavity 1A at the center of the hub 1. Through this transmission structure, the motor 3 can output at a higher speed, which the reducer 2 converts into a low-speed, high-torque output suitable for the rotation of the hub 1.

[0034] In one embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 4 The motor 3 housing is circumferentially fixedly connected to a motor bracket, which is fixedly connected to the rear fork.

[0035] Specifically, the motor bracket is positioned circumferentially around the motor 3 housing and is fixedly connected to it. The motor bracket can be fixedly connected to the rear fork via bolts, flanges, or other mechanical connections. The rear fork, as the rear wheel-end support structure of the vehicle, supports the wheel hub 1, the motor 3, and related transmission components. After the motor bracket is fixed to the rear fork, it restricts the rotation of the motor 3 housing relative to the vehicle frame. When the motor 3 is running, the output shaft of the motor 3 receives torque from the reducer 2, and the motor 3 housing experiences a corresponding reaction torque, which is transmitted to the rear fork through the motor bracket. Thus, the motor 3 housing remains fixed, the output shaft of the motor 3 can stably drive the reducer 2, and the power output direction and assembly position are stable.

[0036] In one embodiment of the present invention, please refer to Figure 2 and Figure 4The reducer 2 and the motor 3 have a central shaft cavity. A central shaft 33 is installed inside the central shaft cavity. One end of the central shaft 33 is rotatably connected to the inner wall of the central shaft cavity in the motor 3 through a bearing. The other end of the central shaft 33 is rotatably connected to the inner wall of the central shaft cavity in the reducer 2 through a bearing. The two ends of the central shaft 33 are used to fix the two ends of the rear fork.

[0037] Specifically, the bottom bracket cavity extends axially along the motor 3 and reducer 2, and the bottom bracket 33 passes through this cavity. One end of the bottom bracket 33 is rotatably connected to the inner wall of the bottom bracket cavity in the motor 3 via a bearing, and the other end of the bottom bracket 33 is rotatably connected to the inner wall of the bottom bracket cavity in the reducer 2 via a bearing. Both ends of the bottom bracket 33 are fixedly connected to both ends of the rear fork, making the bottom bracket 33 a fixed support reference for the wheel end. Rotatable components in the motor 3, reducer 2, and wheel hub 1 can rotate relative to the bottom bracket 33 via bearings. This structure arranges the fixed support components and the rotating transmission components along the same central axis, improving the coaxiality between the motor 3, reducer 2, and wheel hub 1. The vehicle load can be transmitted from the rear fork to the bottom bracket 33, and then via the bearings to the relevant rotating components of the wheel hub 1, thereby meeting the requirements for wheel end load bearing and rotational support.

[0038] In one embodiment of the present invention, please refer to Figure 2 and Figure 4 The motor 3 has a drive shaft 32 axially inserted through it. The drive shaft 32 is hollow in the axial direction to form the central shaft cavity of the motor 3. The sun gear 34 on the drive shaft 32 is fixedly connected to the input end of the reducer 2.

[0039] Specifically, the drive shaft 32 is arranged along the axial direction of the motor 3 and serves as the power output component of the motor 3. The drive shaft 32 adopts a hollow shaft structure, with a central shaft cavity formed inside for the central shaft 33 to pass through. The central shaft 33 passes through the drive shaft 32, and the drive shaft 32 can rotate relative to the central shaft 33. The sun gear 34 is mounted on the drive shaft 32 and is fixedly or transmittedly connected to the input end of the reducer 2. When the motor 3 is working, the drive shaft 32 rotates around the central shaft 33, driving the sun gear 34 to rotate synchronously, and the sun gear 34 inputs power to the reducer 2. The hollow structure of the drive shaft 32 allows the fixed support function of the central shaft 33 and the rotational output function of the drive shaft 32 to be realized in the same axial space, reducing additional radial arrangement space and facilitating the formation of a coaxial transmission system between the motor 3 and the reducer 2.

[0040] In one embodiment of the present invention, please refer to Figure 2 and Figure 4 Motor 3 is an axial motor, which includes a housing, a stator, and a rotor. The stator is fixedly connected to the inner wall of the housing, and the rotor is fixedly connected to the outside of the drive shaft 32. The stator and rotor are circumferentially spaced apart.

[0041] Specifically, the housing forms the external mounting and protective structure of the motor 3 and provides a fixed foundation for the stator. The stator is fixedly connected to the inner wall of the housing, and the rotor is fixedly connected to the outside of the drive shaft 32, rotating synchronously with the drive shaft 32. The stator and rotor are circumferentially spaced, forming an electromagnetic gap. When the motor 3 is energized, the stator generates a magnetic field and drives the rotor to rotate. The rotor drives the drive shaft 32 to rotate, and the drive shaft 32 inputs power to the reducer 2 through the sun gear 34. The axial motor is suitable for being arranged on one axial side of the hub 1, and its structure helps to reduce the occupation of the radial space inside the rim 13. By fixing the stator to the housing and the rotor to the drive shaft 32, the motor 3 housing can be kept relatively fixed, and the drive shaft 32, as the rotation output end, transmits power to the reducer 2.

[0042] In one embodiment of the present invention, please refer to Figures 2 to 4 The reducer 2 has a mounting base 31 on the side facing the motor 3. The outer edge of the mounting base 31 abuts against the inner edge of the flange seat 11, and the planetary gear is located inside the mounting base 31.

[0043] Specifically, the mounting base 31 is located on the side of the reducer 2 closest to the motor 3, and is used to mount or position the planetary gears in the planetary reducer. The outer edge of the mounting base 31 abuts against the inner edge of the flange seat 11, limiting the mounting base 31 radially. The planetary gears are disposed within the mounting base 31 and mesh with the sun gear 34 and other gear components in the reducer 2. After the motor 3 drives the sun gear 34 to rotate via the drive shaft 32, the sun gear 34 drives the planetary gears to move. The planetary gears run within the mounting base 31 according to the planetary transmission path and output power to the flange seat 11 via the reducer 2. The abutment between the mounting base 31 and the inner edge of the flange seat 11 improves the stability of the planetary gear support position and reduces meshing errors caused by the offset of the mounting base 31 during transmission.

[0044] In one embodiment of the present invention, please refer to Figures 2 to 4 The mounting base 31 extends circumferentially at one end of the motor bracket to form a first mounting surface, and the motor bracket extends circumferentially at one end of the mounting base 31 to form a second mounting surface; a sealed bearing is provided between the first mounting surface and the second mounting surface.

[0045] Specifically, the mounting base 31 has a first mounting surface formed circumferentially at one end edge near the motor bracket, and a second mounting surface formed circumferentially at one end edge of the motor bracket near the mounting base 31. The first and second mounting surfaces are axially opposite each other, and a sealed bearing is disposed between them. The sealed bearing provides rotational support between the corresponding components and seals the gap between the mounting base 31 and the motor bracket. During vehicle operation, the wheel end structure is easily affected by water, mud, and dust. The sealed bearing, positioned between the first and second mounting surfaces, restricts the entry of external media into the area adjacent to the motor 3 and the reducer 2. The first and second mounting surfaces extend circumferentially, providing a continuous annular mounting base for the sealed bearing, ensuring a stable mounting position and sealing contact state.

[0046] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A structure for an electric motorcycle motor, characterized in that, include: Wheel hub (1); Motor (3), the motor (3) is disposed on one axial side of the hub (1) and is used to drive the hub (1) to rotate; The hub (1) includes: Wheel rim (13); Flange seat (11), the flange seat (11) is disposed at the axis of the rim (13) and is spaced apart from the rim (13); Multiple spokes (14) are arranged in a circumferential array along the inner ring of the rim (13), and the multiple spokes (14) extend radially along the rim (13) and connect the flange seat (11) and the rim (13). The motor (3) is located on one axial side of the flange seat (11) and is used to drive the flange seat (11) to rotate.

2. The electric motorcycle motor structure as described in claim 1, characterized in that, The flange seat (11) has a first mounting cavity (1A) on one side, and a reducer (2) is provided in the first mounting cavity (1A). The reducer (2) is used to drive the flange seat (11) to rotate the hub (1). The motor (3) is located at one end of the reducer (2) and is used to drive the reducer (2) to run.

3. The electric motorcycle motor structure as described in claim 2, characterized in that, The flange seat (11) is provided with a first step (12), the inner wall of the first step (12) surrounds to form the first mounting cavity (1A), and the inner wall of the first step (12) abuts against the output end of the reducer (2).

4. The electric motorcycle motor structure as described in claim 3, characterized in that, The reducer (2) is a planetary reducer. The input end of the reducer (2) is located at the center of the side of the reducer (2) facing the motor (3). A sun gear (34) is provided on the output shaft of the motor (3). The sun gear (34) meshes with the reducer (2). The output shaft of the motor (3) is connected to the reducer (2) through the sun gear (34).

5. The electric motorcycle motor structure as described in claim 4, characterized in that, The motor (3) housing is circumferentially fixedly connected to a motor bracket, and the motor bracket is fixedly connected to the rear fork.

6. The electric motorcycle motor structure as described in claim 5, characterized in that, The reducer (2) has a central shaft cavity at its center and the motor (3) has a central shaft (33) inside the central shaft cavity. One end of the central shaft (33) is rotatably connected to the inner wall of the central shaft cavity in the motor (3) through a bearing, and the other end of the central shaft (33) is rotatably connected to the inner wall of the central shaft cavity in the reducer (2) through a bearing. The two ends of the central shaft (33) are respectively used to be fixedly connected to the two ends of the rear fork.

7. The electric motorcycle motor structure as described in claim 6, characterized in that, The motor (3) has a drive shaft (32) axially inserted through it. The drive shaft (32) is axially hollow to form the central shaft cavity of the motor (3). The sun gear (34) on the drive shaft (32) is fixedly connected to the input end of the reducer (2).

8. The electric motorcycle motor structure as described in claim 7, characterized in that, The motor (3) is an axial motor, and the motor (3) includes: case; The stator is fixedly connected to the inner wall of the housing; The rotor is fixedly connected to the outside of the drive shaft (32), and the stator is circumferentially spaced from the rotor.

9. The electric motorcycle motor structure as described in claim 4, characterized in that, The reducer (2) has a mounting base (31) on the side facing the motor (3), the outer edge of the mounting base (31) abuts against the inner edge of the flange seat (11), and the planetary gear is disposed in the mounting base (31).

10. The electric motorcycle motor structure as described in claim 9, characterized in that, The mounting base (31) extends circumferentially at one end edge facing the motor bracket to form a first mounting surface, and the motor bracket extends circumferentially at one end edge facing the mounting base (31) to form a second mounting surface; A sealed bearing is provided between the first mounting surface and the second mounting surface.

Images