Inner rotor motor core assembly installation structure

Abstract

The utility model discloses an inner rotor motor core assembly mounting structure, which comprises a driving stator and rotor, a core end cover, a gear box cover, a planetary gear mechanism and a flange plate assembly, the driving stator and rotor are arranged in the core end cover, the gear box cover is fixedly connected with the port of the core end cover, and the driving stator and rotor are sealed by the gear box cover and the port of the core end cover. A planetary gear mechanism is installed in a cavity in the outer side of the gear box cover, the flange plate assembly axially positions the planetary gear mechanism from the outer side, and the flange plate assembly is fixedly connected with the gear box cover. The flange plate assembly is of a split type structure and comprises a flange plate body and a supporting shaft, an assembling hole is formed in the center of the flange plate body, the supporting shaft and the assembling hole are detachably connected, a limiting plane is arranged in the assembling hole, a limiting face corresponding to the limiting plane is machined at the end of the supporting shaft, and the supporting shaft and the assembling hole are in interference fit. The installation structure has the advantages of being stable in structure, low in production cost, high in strength and high in applicability.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric assist bicycles, and particularly relates to an installation structure of an inner rotor motor core assembly. Background Art

[0002] An electric assist bicycle is a mechatronic personal transportation vehicle that installs operating components such as a motor, a controller, a storage battery, a handlebar, and a brake handle, as well as a display instrument system on the basis of an ordinary bicycle. Electric assist bicycles have become a very common means of transportation, and a hub motor is one of the important accessories of an electric assist bicycle.

[0003] In a hub motor, the motor is integrated inside the hub. After being powered on, the motor converts electrical energy into mechanical energy, thereby driving the wheel to rotate and driving the vehicle forward. Currently, in the inner rotor hub motor or the speed change hub on the market, the half shafts on the driving stator / rotor or the gearbox of the speed change hub are of an integral structure, that is, the half shaft and the flange for supporting the planetary gear are a whole piece. During processing, the production process of the integral flange structure is cumbersome, especially the machining of the flange surface is inconvenient, and the machining amount is large. Due to the characteristics of the material and the structure itself, vibration will occur during the machining of the flange surface, resulting in dimensional deviation. Moreover, for different shaft diameters and shaft lengths, the entire component needs to be reprocessed, so that the overall processing cost of the component is high and the machining accuracy is affected. Summary of the Utility Model

[0004] In view of the above problems and technical requirements, the utility model provides an installation structure of an inner rotor motor core assembly. In this structure, the flange for supporting the driving gear and the shaft member are set as a split structure, which not only reduces the processing difficulty, but also enables the flange to cooperate with shaft members of different lengths, greatly improving the flexibility and applicability.

[0005] The technical solution of the utility model is as follows: An installation structure of an inner rotor motor core assembly includes a driving stator / rotor, a core end cover, a gearbox cover, a planetary gear mechanism, and a flange assembly. The driving stator / rotor is arranged inside the core end cover, and the gearbox cover is fixedly connected to the port of the core end cover. The two enclose the driving stator / rotor inside. A planetary gear mechanism is installed in the outer cavity of the gearbox cover, and the flange assembly axially positions the planetary gear mechanism from the outside. The flange assembly is fixedly connected to the gearbox cover; the flange assembly is of a split structure and includes a flange body and a support shaft. An assembly hole is provided in the center of the flange body. The support shaft and the assembly hole are detachably connected. A limiting plane is provided in the assembly hole, and a limiting surface corresponding to the limiting plane is processed at the end of the support shaft. The support shaft and the assembly hole are in interference fit.

[0006] Further, the driving stator-rotor includes a stator, a rotor and a main shaft. The stator is fixedly arranged inside the movement end cover. The rotor is arranged at the center of the stator. The core of the rotor is connected with the main shaft by a key. The stator drives the rotor and the main shaft to rotate. The circumferential surface of the front end of the main shaft is machined with driving shaft teeth which extend into the gearbox cover, and the driving shaft teeth drive the planetary gear mechanism to rotate.

[0007] Further, the planetary gear mechanism includes three planetary gears which are circumferentially meshed on the driving shaft teeth. The center of each planetary gear is rotatably connected with a gear shaft. The rear end of the gear shaft is connected to the end face of the gearbox cover, and the front end of the gear shaft is supported and connected to the flange plate body. A bearing is arranged between the planetary gear and the gear shaft.

[0008] Further, the planetary gear is a double gear. The upper layer of the planetary gear is a spur gear with a small diameter, and the lower layer is a helical gear with a large diameter. The helical gear is meshed and connected with the driving shaft teeth, and the spur gear and the helical gear are an integral connecting piece.

[0009] Further, three supporting bumps are arranged on the front end face of the gearbox cover and are respectively arranged between the three planetary gears. The flange plate body is fixedly connected to the top surfaces of the three supporting bumps, and a containing space for the planetary gear mechanism is formed between the gearbox cover and the flange plate body.

[0010] Further, three shaft holes and three screw holes are arranged at intervals around the center of the flange plate body. The three shaft holes respectively position the three gear shafts. The three screw holes correspond to the supporting bumps one by one, and the screw holes and the supporting bumps are locked and connected by screws.

[0011] Further, an axial limiting ring protrudes inwards in the middle of the assembly hole at the center of the flange plate body. A groove corresponding to the axial limiting ring is arranged at the front end of the support shaft. When the support shaft is connected with the assembly hole, the axial limiting ring is embedded in the groove, so that there is no axial displacement between the support shaft and the flange plate body. In addition to the above tight fit installation, this structure can also directly cast the support shaft on the basis of the finished flange plate body to make the two processed into a whole, and ensure that there is no axial and circumferential shaking between the shaft and the flange plate when casting the finished product. Of course, the center of the flange plate can also be processed into a flat hole, and the shaft and the flange plate are pressed and assembled into a component by a tight fit method.

[0012] Further, the limiting planes are arranged in the assembly holes on the front side and the rear side of the axial limiting ring, and the limiting planes limit the circumferential rotation of the support shaft.

[0013] Further, three vacant surfaces corresponding to the spur gears are arranged on the circumferential surface of the flange plate body. Part of the teeth of the spur gears protrude from the vacant surfaces, and the teeth of the three spur gears are simultaneously connected with the external tooth ring structure to transmit power outwards.

[0014] Furthermore, a wheel axle corresponding to the support shaft is provided at the center of the outer side of the end face of the movement end cover, and the central axes of the wheel axle, the main shaft, and the support shaft coincide.

[0015] The beneficial effects of the present utility model are as follows: 1) In this structure, the flange plate body and the central support shaft are of a split structure, which can be processed separately during processing. Separate processing can improve processing efficiency, reduce processing difficulty and production cost; 2) For different shaft length requirements, support shafts with different shaft lengths that have been directly processed can be used to match the flange plate body, effectively improving the adaptability and flexibility of use of the hub body, and having a wider application range; 3) There is good stability between the flange plate body and the support shaft, which is reflected in axial stability and circumferential stability. The axial limiting ring provided in the middle of the assembly hole achieves the limiting effect on the axis of the support shaft, and the limiting plane can circumferentially limit the support shaft to prevent the support shaft from rotating circumferentially after installation. Therefore, the split flange plate structure can still achieve the mechanical properties of the integral structure. The simplified processing process also reduces the difficulty of processing screw holes and shaft holes on the surface of the flange plate body and improves the accuracy. It has the advantages of stable structure, low production cost, high strength, and strong applicability. Description of the Drawings

[0016] Figure 1 is an exploded view of the installation structure of the internal rotor motor gearbox assembly of the present utility model;

[0017] Figure 2 is an assembly drawing of the installation structure of the internal rotor motor gearbox assembly of the present utility model;

[0018] Figure 3 is an assembly drawing of the planetary gear mechanism in the present utility model;

[0019] Figure 4 is an assembly structure drawing of the flange plate assembly in the present utility model;

[0020] Figure 5 is a structure drawing of the support shaft in the present utility model;

[0021] Figure 6 is a structure drawing of the flange plate body in the present utility model;

[0022] The labels in the figure are: driving stator and rotor 1, stator 11, rotor 12, main shaft 13, driving shaft gear 131, movement end cover 2, wheel axle 21, gearbox cover 3, support bump 31, planetary gear mechanism 4, planetary gear 41, spur gear 411, helical gear 412, gear shaft 42, bearing 43, flange plate assembly 5, flange plate body 6, assembly hole 61, limiting plane 611, axial limiting ring 612, shaft hole 62, screw hole 63, vacant surface 64, support shaft 7, limiting surface 71, groove 72. Detailed Embodiments

[0023] The following further describes the present utility model in conjunction with the accompanying drawings and embodiments.

[0024] As Figure 1-6 shown is the installation structure of the internal rotor motor gearbox assembly of the present utility model, which includes a driving stator-rotor 1, a movement end cover 2, a gearbox cover 3, a planetary gear mechanism 4, and a flange plate assembly 5. The driving stator-rotor 1 is arranged inside the movement end cover 2. The gearbox cover 3 is fixedly connected to the port of the movement end cover 2, and the two enclose the driving stator-rotor 1 inside. A planetary gear mechanism 4 is installed in the outer cavity of the gearbox cover 3. The flange plate assembly 5 axially positions the planetary gear mechanism 4 from the outside, and the flange plate assembly 5 is fixedly connected to the gearbox cover 3. Three support bumps 31 are provided on the front end face of the gearbox cover 3, and the three support bumps 31 are respectively arranged between the three planetary gears 41. The flange plate body 6 is fixedly connected to the top surfaces of the three support bumps 31, and a receiving space for the planetary gear mechanism 4 is formed between the gearbox cover 3 and the flange plate body 6.

[0025] The flange plate assembly 5 is of a split structure. The flange plate assembly 5 includes a flange plate body 6 and a support shaft 7. An assembly hole 61 is provided in the center of the flange plate body 6. The support shaft 7 and the assembly hole 61 are detachably connected. A limiting plane 611 is provided in the assembly hole 61, and a limiting surface 71 corresponding to the limiting plane 611 is machined at the end of the support shaft 7. The support shaft 7 and the assembly hole 61 are in an interference fit. Specifically, an axial limiting ring 612 protrudes inward in the middle of the assembly hole 61 in the center of the flange plate body 6. A groove 72 corresponding to the axial limiting ring 612 is provided at the front end of the support shaft 7. When the support shaft 7 is connected to the assembly hole 61, the axial limiting ring 612 is embedded in the groove 72, so that there is no axial movement between the support shaft 7 and the flange plate body 6. The limiting plane 611 is provided in the assembly hole 61 on the front side and the rear side of the axial limiting ring 612, and the limiting plane 611 restricts the circumferential rotation of the support shaft 7.

[0026] The driving stator-rotor 1 includes a stator 11, a rotor 12, and a main shaft 13. The stator 11 is fixedly arranged inside the movement end cover 2. The rotor 12 is arranged at the center of the stator 11. A main shaft 13 is key-connected to the core of the rotor 12. The stator 11 drives the rotor 12 and the main shaft 13 to rotate. A driving shaft tooth 131 is machined on the circumferential surface at the front end of the main shaft 13, and the driving shaft tooth 131 extends into the gearbox cover 3 to drive the planetary gear mechanism 4 to rotate. A wheel shaft 21 corresponding to the support shaft 7 is provided at the center of the outer side of the end face of the movement end cover 2, and the central axes of the wheel shaft 21, the main shaft 13, and the support shaft 7 coincide.

[0027] The planetary gear mechanism 4 includes three planetary gears 41. The three planetary gears 41 are circumferentially meshed with the drive shaft gear 131. A gear shaft 42 is rotatably connected to the center of each planetary gear 41. The rear end of the gear shaft 42 is connected to the end face of the gearbox cover 3, and the front end of the gear shaft 42 is supported and connected to the flange body 6. A bearing 43 is provided between the planetary gear 41 and the gear shaft 42. The planetary gear 41 is a double gear. The upper layer of the planetary gear 41 is a spur gear 411 with a small diameter, and the lower layer is a helical gear 412 with a large diameter. The helical gear 412 is meshed with the drive shaft gear 131. The spur gear 411 and the helical gear 412 are integrally connected.

[0028] The flange body 6 is provided with three shaft holes 62 and three screw holes 63 at intervals around the center. The three shaft holes 62 respectively position the three gear shafts 42. The three screw holes 63 correspond to the support bumps 31 one by one. The screw holes 63 and the support bumps 31 are locked and connected by screws. The circumferential surface of the flange body 6 is provided with three vacant surfaces 64 corresponding to the spur gears 411. Some teeth of the spur gears 411 protrude from the vacant surfaces 64. The teeth of the three spur gears 411 are simultaneously connected to an external ring gear structure to transmit power outward.

[0029] The operation process of the present invention: After the driving stator and rotor 1 is powered on, the stator 11 drives the rotor 12 and the main shaft 13 to rotate. The drive shaft gear 131 at the front end of the main shaft 13 is meshed with the three planetary gears 41. The main shaft 13 drives the three planetary gears 41 to rotate, and the three planetary gears 41 rotate around the gear shafts 42; outside the planetary gears 41, there is a ring gear structure (not shown in the figure). The outside of this ring gear structure is connected to the wheel through spokes. The planetary gears 41 drive the ring gear structure to rotate, so that the bicycle moves forward; the flange body 6 and the support shaft 7 play a role in supporting the planetary gear mechanism 4 and should maintain a balanced and stable state. Since an axial limit ring 612 is provided axially between the support shaft 7 and the assembly hole 61, and a limit plane 611 is provided circumferentially, the two are locked and limited both axially and circumferentially. In the operating state, the flange assembly 5 can maintain stable support, has high mechanical strength, and can meet the vehicle use requirements.

[0030] The above is only several preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes and substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An inner rotor motor core assembly mounting structure, characterized in that: It includes a driving stator and rotor, a movement end cover, a gear box cover, a planetary gear mechanism and a flange assembly, wherein the driving stator and rotor are arranged in the movement end cover, the gear box cover is fixedly connected to the movement end cover port, the two enclose the driving stator and rotor inside, a planetary gear mechanism is installed in the outer cavity of the gear box cover, the flange assembly axially positions the planetary gear mechanism from the outside, and the flange assembly and the gear box cover are fixedly connected; the flange assembly is a split structure, the flange assembly includes a flange body and a support shaft, an assembly hole is provided at the center of the flange body, the support shaft and the assembly hole are detachably connected, a limiting plane is provided in the assembly hole, a limiting surface corresponding to the limiting plane is processed at the end of the support shaft, and an interference fit is provided between the support shaft and the assembly hole.

2. The inner rotor motor core assembly installation structure according to claim 1, characterized in that: The driving stator and rotor include a stator, a rotor and a main shaft. The stator is fixedly arranged in the end cover of the movement, and the rotor is arranged in the center of the stator. The core of the rotor is connected to the main shaft through a key. The stator drives the rotor and the main shaft to rotate. The front end circumference of the main shaft is processed with driving shaft teeth. The driving shaft teeth extend into the gear box cover, and the driving shaft teeth drive the planetary gear mechanism to rotate.

3. The inner rotor motor core assembly installation structure according to claim 2, characterized in that: The planetary gear mechanism includes three planetary gears, which are meshed around the drive shaft teeth. Each planetary gear is centrally connected to a gear shaft, the rear end of the gear shaft is connected to the end face of the gear box cover, the front end of the gear shaft is supported and connected to the flange body, and bearings are provided between the planetary gears and the gear shaft.

4. The inner rotor motor core assembly installation structure according to claim 3, characterized in that: The planetary gear is a double gear, the upper layer of the planetary gear is a spur gear with a small diameter, and the lower layer is a helical gear with a large diameter. The helical gear is meshed and connected with the drive shaft teeth, and the spur gear and the helical gear are an integrated connecting piece.

5. The inner rotor motor core assembly installation structure according to claim 4, characterized in that: The front end surface of the gear box cover is provided with three supporting protrusions, which are respectively arranged between the three planetary gears. The flange body is fixedly connected to the top surfaces of the three supporting protrusions, and a receiving space for the planetary gear mechanism is formed between the gear box cover and the flange body.

6. The inner rotor motor core assembly installation structure according to claim 5, characterized in that: The flange body is provided with three shaft holes and three screw holes at intervals around the center, the three shaft holes respectively position the three gear shafts, the three screw holes correspond to the supporting protrusions one by one, and the screw holes and the supporting protrusions are locked and connected by screws.

7. The inner rotor motor core assembly installation structure according to claim 6, characterized in that: An axial limit ring is protruding inwardly from the middle of the assembly hole in the center of the flange body, and a groove corresponding to the axial limit ring is provided at the front end of the support shaft. When the support shaft is connected to the assembly hole, the axial limit ring is embedded in the groove to prevent axial movement of the support shaft and the flange body.

8. The inner rotor motor core assembly installation structure according to claim 7, characterized in that: The limiting planes are arranged in the assembly holes at the front and rear sides of the axial limiting ring, and the limiting planes limit the rotation of the supporting shaft in the circumferential direction.

9. The inner rotor motor core assembly installation structure according to claim 8, characterized in that: The circumferential surface of the flange body is provided with three vacant surfaces corresponding to the spur gears, and part of the teeth of the spur gears protrude from the vacant surfaces. The teeth of the three spur gears are simultaneously connected to the external gear ring structure to transmit power outward.

10. The inner rotor motor core assembly installation structure according to claim 9, characterized in that: A wheel axle corresponding to the support shaft is arranged at the center of the outer side of the end surface of the movement end cover, and the central axes of the wheel axle, the main shaft and the support shaft coincide with each other.

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