Concentric shaft centrally-mounted motor

Abstract

The utility model discloses a concentric shaft centrally-mounted motor, and relates to the field of motors. According to the technical scheme, a stator support is connected with an end cover, a clutch support and a clutch assembly are arranged on the outer side and the inner end of an output sleeve respectively, and a controller is arranged on the outer end face of the end cover. The structure can be simplified, the assembly is convenient, and the cost is reduced; the controller is arranged on the outer end face of the end cover, so that the temperature influence of the stator winding on the controller can be reduced, the temperature of the controller can be reduced, the heat dissipation effect can be improved, and the performance of the motor can be improved; in addition, if the controller breaks down, the controller can be independently detached and then overhauled, the whole motor does not need to be detached, and therefore later maintenance is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of motors, and more specifically, to a concentric shaft centrally mounted motor. Background Art

[0002] The existing Chinese patent with authorization announcement number CN217496448U discloses a mid-mounted motor for a power-assisted bicycle based on a double planetary gear train transmission, which includes a chassis, a five-way shaft, a first inner gear ring, a power transmission sleeve, an output sleeve, two planetary gear trains, a first overrunning clutch, a motor output unit and a second overrunning clutch.

[0003] In the above patent, the stator bracket of the motor output unit is integrally formed on the inner wall of the chassis, and a dual clutch and a dual planetary gear system are used to achieve transmission. Such a structure is relatively complex, resulting in high production costs, greater assembly difficulty, and prone to failure, which affects the service life. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a concentric shaft mid-mounted motor, which connects the stator bracket with the end cover, arranges the clutch bracket and the clutch assembly on the outer side and the inner end of the output sleeve respectively, and arranges the controller on the outer end surface of the end cover, which can simplify the structure, facilitate assembly, reduce costs, improve the heat dissipation effect of the controller, and is conducive to improving the performance of the motor.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A concentric shaft mid-mounted motor comprises a main shaft, a housing and an end cover, wherein a cavity is formed between the housing and the end cover; a core assembly, a planetary gear assembly and an output sleeve are sequentially arranged on the main shaft and located in the cavity;

[0007] The core assembly comprises a stator bracket and a rotor, wherein the stator bracket is fixedly connected to the end cover, and a bearing is arranged between the inner side wall of the stator bracket and the rotor;

[0008] The planetary gear assembly includes a sun gear connected to the rotor, planetary gears, a clutch bracket carrying the planetary gears, and a gear ring fixed to the inner side wall of the casing;

[0009] The inner end of the output sleeve is connected to the clutch bracket, and the outer end thereof extends out of the housing; a clutch assembly is arranged between the main shaft and the output sleeve.

[0010] Furthermore, the inner end surface of the end cover is provided with a positioning stopper that cooperates with the stator bracket.

[0011] Furthermore, the rotor includes an end plate, and an inner ring plate and an outer ring plate respectively arranged at the radial ends of the end plate; the inner ring plate and the outer ring plate are located on the same side of the end plate; a bearing is arranged between the inner wall of the stator bracket and the outer wall of the inner ring plate.

[0012] Furthermore, a radial gap is formed between the main shaft and the rotor; a magnetic ring located in the radial gap is sleeved on the main shaft, the magnetic ring rotates synchronously with the main shaft, and a speed sensor cooperating with the magnetic ring is arranged on the end cover.

[0013] Furthermore, the main shaft upper fixed sleeve is provided with a magnetic ring bracket for carrying the magnetic ring.

[0014] Furthermore, the clutch bracket includes a clutch bracket outer ring and a clutch bracket inner ring; the clutch bracket inner ring is fixedly sleeved on the outer side wall of the output sleeve, or the clutch bracket inner ring and the output sleeve are integrally formed.

[0015] Furthermore, the clutch assembly includes a clutch outer ring and a clutch inner ring; the clutch outer ring is fixedly embedded in the inner wall of the output sleeve, and a keyway assembly is provided between the clutch inner ring and the main shaft.

[0016] Furthermore, the motor also includes a controller arranged on the outer end surface of the end cover.

[0017] Furthermore, the controller includes a controller housing connected to the end cover, and the controller housing is arc-shaped.

[0018] Furthermore, the outer side wall of the controller housing is provided with heat dissipation ridges arranged along the circumferential direction.

[0019] In summary, the utility model has the following beneficial effects:

[0020] 1. The stator bracket is provided with screws connected to the end cover, so as to realize the fixed connection between the stator bracket and the end cover, which can simplify the structure of the casing and the end cover and facilitate the assembly of the movement components;

[0021] 2. The speed sensor cooperates with the magnetic ring to detect the pedal speed of the spindle, so as to facilitate the control of the movement components; the magnetic ring is set in the radial gap between the rotor and the spindle to make full use of the internal space, and the structure is compact, which is conducive to optimizing the radial size of the motor;

[0022] 3. A cavity is formed between the housing and the end cover, and the controller is arranged outside the cavity, which can make full use of the cavity, realize the compact arrangement of the movement assembly and the planetary gear assembly, and facilitate assembly and reduce costs; the controller is arranged on the outer end face of the end cover, which can reduce the temperature influence of the stator winding on the controller, which is beneficial to reduce the temperature of the controller and improve the heat dissipation effect, thereby improving the performance of the motor; if the controller fails, the controller can be removed separately for inspection and repair without disassembling the motor, which is convenient for later maintenance;

[0023] 4. The clutch bracket and clutch assembly are arranged on the outside and inside of the output sleeve respectively to form a dual-clutch structure. This structure is simple, easy to assemble, stable, and low in cost. In addition, the torque transmission path is short in pedaling mode, and the pedaling feedback is rapid, which is conducive to optimizing the riding experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The structure of the concentric shaft mid-mounted motor in the embodiment is shown in FIG. Figure 1 ;

[0025] Figure 2 The structure of the concentric shaft mid-mounted motor in the embodiment is shown in FIG. Figure 2 ;

[0026] Figure 3 Schematic diagram of the structure of the speed sensor and the magnetic ring in the embodiment.

[0027] In the figure: 1, main shaft; 21, casing; 22, end cover; 31, stator winding; 32, stator bracket; 33, rotor; 41, sun gear; 42, planetary gear; 43, clutch bracket; 44, ring gear; 45, output sleeve; 5, clutch assembly; 61, magnetic ring bracket; 62, magnetic ring; 63, speed sensor; 71, control module; 72, controller housing; 721, heat dissipation ridge; 8, toothed disc. DETAILED DESCRIPTION

[0028] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0029] 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, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention. Example

[0030] A concentric shaft mid-mounted motor, referring to Figures 1 to 3, which includes, including a main shaft 1, a casing 21 and an end cover 22; the casing 21 and the end cover 22 are connected by screws, and a cavity is formed between the casing 21 and the end cover 22; specifically, in this embodiment, a bearing is arranged between the end cover 22 and the main shaft 1; the main shaft 1 is sequentially provided with a movement assembly located in the cavity, a planetary gear assembly and an output sleeve 45; the movement assembly includes a stator winding 31, a stator bracket 32 ​​carrying the stator winding 31 and a rotor, the stator bracket 32 ​​is fixedly connected to the end cover 22, and a bearing is arranged between the inner side wall of the stator bracket 32 ​​and the rotor 33; specifically, in this embodiment, the rotor 33 includes an end plate, and an inner ring plate and an outer ring plate respectively arranged at the radial ends of the end plate; the inner ring plate and the outer ring plate are located on the same side of the end plate; a bearing is arranged between the inner side wall of the stator bracket 32 ​​and the outer side wall of the inner ring plate; the rotor 33 is rollingly supported on the stator bracket 32, which can facilitate assembly and optimize axial and radial dimensions.

[0031] Reference Figures 1 to 3 Specifically, the stator bracket 32 ​​is provided with screws connected to the end cover 22, so as to realize the fixed connection between the stator bracket 32 ​​and the end cover 22, which can simplify the structure of the casing and the end cover and facilitate the assembly of the movement assembly; preferably, the inner end surface of the end cover 22 is provided with a positioning stop that cooperates with the stator bracket 32, which is conducive to controlling the concentricity of the stator winding and avoiding assembly interference.

[0032] Reference Figures 1 to 3 In this embodiment, the planetary gear assembly includes a sun gear 41 connected to the rotor 33, a planetary gear 42, a clutch bracket 43 carrying the planetary gear 42, and a gear ring 44 fixed to the inner wall of the housing 21; specifically, the clutch bracket 43 includes a clutch bracket outer ring and a clutch bracket inner ring; in this embodiment, the clutch bracket inner ring is located at the inner end of the outer wall of the output sleeve 45, and the clutch bracket inner ring and the output sleeve 45 are integrally formed, thereby reducing the number of parts and facilitating assembly.

[0033] Reference Figures 1 to 3 The outer end of the output sleeve 45 extends out of the housing 21, and an output gear is provided at the outer end of the output sleeve 45, and a toothed disc 8 is sleeved on the output gear; the output gear is connected to the toothed disc 8, which is beneficial to improving the stability of the output transmission and extending the service life; the output sleeve 45 and the main shaft 1 are provided with a clutch assembly 5; specifically, the clutch assembly 5 includes a clutch outer ring and a clutch inner ring; the clutch outer ring is fixedly embedded in the inner wall of the output sleeve 45, and a keyway assembly is provided between the clutch inner ring and the main shaft 1; that is, the clutch inner ring rotates synchronously with the main shaft 1, and the clutch outer ring rotates synchronously with the output sleeve 45; preferably, the clutch assembly in this embodiment is a needle roller clutch assembly, so that the radial dimension can be optimized.

[0034] Reference Figures 1 to 3In this embodiment, a radial gap is formed between the main shaft 1 and the rotor 33; a magnetic ring bracket 61 is fixedly provided on the main shaft 1, and a magnetic ring 62 is fixedly provided on the magnetic ring bracket 61, and the magnetic ring bracket 61 and the magnetic ring 62 are located in the radial gap; a speed sensor 63 cooperating with the magnetic ring 62 is fixedly provided on the inner end surface of the end cover 22; the speed sensor 63 cooperates with the magnetic ring 62 to detect the pedaling speed of the main shaft 1, thereby facilitating the control of the movement assembly; the magnetic ring 62 is arranged in the radial gap between the rotor 33 and the main shaft 1, so as to make full use of the internal space, and the structure is compact, which is conducive to optimizing the radial size of the motor.

[0035] Reference Figures 1 to 3 Preferably, the motor in this embodiment also includes a controller arranged on the outer end surface of the end cover 22; specifically, the controller includes a controller housing 72 connected to the end cover 22, and a control module 71 arranged in the controller housing 72; preferably, the controller housing 72 is arc-shaped, so as to reduce the volume, facilitate assembly and avoid interference; preferably, the outer side wall of the controller housing 72 is provided with heat dissipation ribs 721 arranged along the circumferential direction, so as to improve the heat dissipation effect; in this embodiment, a cavity is formed between the casing 21 and the end cover 22, and the controller is arranged on the outside of the cavity, so that full utilization of the cavity can be achieved, and a compact arrangement of the movement assembly and the planetary gear assembly can be achieved, and assembly is convenient and cost is reduced; arranging the controller on the outer end surface of the end cover can reduce the temperature influence of the stator winding on the controller, which is beneficial to reducing the temperature of the controller and improving the heat dissipation effect, thereby improving the performance of the motor; if the controller fails, the controller can be removed separately for inspection and repair without disassembling the entire motor, thereby facilitating later maintenance.

[0036] The concentric shaft mid-mounted motor in this embodiment includes a pedaling mode and a power assist mode.

[0037] In the power-assist mode, the torque of the rotor 33 is transmitted to the output sleeve 45 via the planetary gear assembly, and the output sleeve 45 drives the chainring 8 to rotate to achieve power output; the ring gear 44 is fixed, the sun gear 41 is active, and the clutch bracket 43 is passive, then the rotor 33 and the output sleeve 45 have the same rotation direction; at this time, the clutch assembly 5 is in an idling state, and the torque of the output sleeve 45 cannot be transmitted to the main shaft 1, and will not drive the main shaft 1 to rotate, thereby optimizing the riding experience.

[0038] In pedaling mode, the pedal drives the main shaft 1 to rotate, and the torque of the main shaft 1 is transmitted to the output sleeve 45 through the clutch assembly 5. The output sleeve 45 drives the chainring to rotate to achieve power output. At this time, the clutch bracket 43 is in an idling state, and the torque of the output sleeve 45 cannot be transmitted to the outer ring of the clutch bracket, and cannot be transmitted to the rotor 33. In this way, when pedaling, no back electromotive force is generated, thereby protecting the motor and the controller, while reducing riding resistance, saving the rider's physical energy, and optimizing the riding experience.

[0039] In this embodiment, the clutch bracket 43 and the clutch assembly 5 are respectively arranged on the outside and the inside of the output sleeve 45 to form a dual-clutch structure. This structure is simple, easy to assemble, stable, and low in cost. In addition, the torque transmission path is short in the pedaling mode, and the pedaling feedback is rapid, which is conducive to optimizing the riding experience.

Claims

1. A concentric shaft mid-mounted motor, characterized in that: It comprises a main shaft, a casing and an end cover, wherein a cavity is formed between the casing and the end cover; a core assembly, a planetary gear assembly and an output sleeve are sequentially arranged on the main shaft and located in the cavity; The core assembly comprises a stator bracket and a rotor, wherein the stator bracket is fixedly connected to the end cover, and a bearing is arranged between the inner side wall of the stator bracket and the rotor; The planetary gear assembly includes a sun gear connected to the rotor, planetary gears, a clutch bracket carrying the planetary gears, and a gear ring fixed to the inner side wall of the casing; The inner end of the output sleeve is connected to the clutch bracket, and the outer end thereof extends out of the housing; a clutch assembly is arranged between the main shaft and the output sleeve.

2. The concentric shaft mid-mounted motor according to claim 1, characterized in that: The inner end surface of the end cover is provided with a positioning stopper matched with the stator bracket.

3. The concentric shaft mid-mounted motor according to claim 1, characterized in that: The rotor includes an end plate, and an inner ring plate and an outer ring plate respectively arranged at the radial ends of the end plate; the inner ring plate and the outer ring plate are located on the same side of the end plate; a bearing is arranged between the inner side wall of the stator bracket and the outer side wall of the inner ring plate.

4. The concentric shaft mid-mounted motor according to claim 1, characterized in that: A radial gap is formed between the main shaft and the rotor; a magnetic ring located in the radial gap is sleeved on the main shaft, the magnetic ring rotates synchronously with the main shaft, and a speed sensor matched with the magnetic ring is arranged on the end cover.

5. The concentric shaft mid-mounted motor according to claim 4, characterized in that: The main shaft upper fixed sleeve is provided with a magnetic ring bracket for carrying the magnetic ring.

6. The concentric shaft mid-mounted motor according to claim 1, characterized in that: The clutch bracket comprises a clutch bracket outer ring and a clutch bracket inner ring; the clutch bracket inner ring is fixedly sleeved on the outer side wall of the output sleeve, or the clutch bracket inner ring and the output sleeve are integrally formed.

7. The concentric shaft mid-mounted motor according to claim 1, characterized in that: The clutch assembly comprises a clutch outer ring and a clutch inner ring; the clutch outer ring is fixedly embedded in the inner side wall of the output sleeve, and a keyway assembly is arranged between the clutch inner ring and the main shaft.

8. The concentric shaft mid-mounted motor according to claim 1, characterized in that: The motor also includes a controller arranged on the outer end surface of the end cover.

9. The concentric shaft mid-mounted motor according to claim 8, characterized in that: The controller comprises a controller housing connected to the end cover, and the controller housing is in an arc shape.

10. The concentric shaft mid-mounted motor according to claim 9, characterized in that: The outer side wall of the controller housing is provided with heat dissipation ridges arranged along the circumferential direction.

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