A new type of light-load hub motor

Abstract

This utility model relates to a novel lightweight hub motor, comprising a stator support, a stator winding, a magnet ring, and a rotor yoke arranged sequentially from the inside out. The stator winding is fixed to the stator support, and the magnet ring is interference-fitted with the rotor yoke. A synchronously rotating hollow shaft is provided at the center of the rotor yoke, with both ends of the hollow shaft passing through the stator support and the rotor yoke, respectively. The stator support is rotatably engaged with the hollow shaft via a first thin-walled bearing, and the stator support is rotatably engaged with the rotor yoke via a second thin-walled bearing. This utility model connects the two sides of the hub motor by setting a hollow shaft passing through the stator support and the rotor yoke, allowing wires to pass through the hollow shaft to connect electrical equipment on both sides of the hub motor, thereby enhancing the expandability of the hub motor. For example, decorative lights can be installed on the outer surface of the rotor yoke. In addition, the hollow shaft can also serve as a mounting or fixing position for other functional modules.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a novel light-load hub motor. Background Technology

[0002] With the rapid development of industrial technology, hub motor technology has gradually come into the public eye. A hub motor is a drive technology that integrates a motor directly into the wheel hub. Due to its high efficiency and compact design, hub motors can be applied to mobile devices such as smart cars, smart sweepers, and smart robots.

[0003] Existing hub motors have very compact internal space and poor expandability due to the integration of many devices. If you want to install modules with other functions on top of the hub motor, it is difficult to find the space required for installation and wiring, such as installing lights on the hub motor itself. Utility Model Content

[0004] In view of the current state of the prior art, the technical problem to be solved by this utility model is to provide a new type of light-load hub motor that facilitates wiring and the addition of other functional modules.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a novel light-load hub motor, comprising a stator support, a stator winding, a magnet ring, and a rotor yoke arranged sequentially from the inside to the outside. The stator winding is fixed on the stator support, and the magnet ring is interference-fitted with the rotor yoke. A synchronously rotating hollow shaft is provided at the center of the rotor yoke, and the two ends of the hollow shaft pass through the stator support and the rotor yoke, respectively. The stator support is rotatably engaged with the hollow shaft through a first thin-walled bearing, and the stator support is rotatably engaged with the rotor yoke through a second thin-walled bearing.

[0006] Furthermore, a shaft groove for interference fit of the hollow shaft is provided at the center of the rotor yoke, and a channel for the hollow shaft to pass through is provided at the center of the stator support. The first thin-walled bearing is installed between the inner wall of the channel and the outer wall of the hollow shaft, and the second thin-walled bearing is installed between the inner wall of the channel and the outer wall of the shaft groove.

[0007] Furthermore, a ring protrusion is provided inside the channel between the first thin-walled bearing and the second thin-walled bearing. The end face of the ring protrusion facing the first thin-walled bearing is in contact with the first thin-walled bearing, and the end face of the ring protrusion facing the second thin-walled bearing is in contact with the second thin-walled bearing.

[0008] Furthermore, the outer wall of the shaft groove is provided with a first stepped surface for blocking the second thin-walled bearing.

[0009] Furthermore, the hollow shaft has a preload portion at one end facing the stator support for blocking the first thin-walled bearing.

[0010] Furthermore, the pre-tightening part includes a plurality of first stops arranged in a ring at equal intervals and a plurality of second stops arranged in a ring at equal intervals. The first stops and the second stops are distributed at intervals. The end face of the first stop facing the first thin-walled bearing is lower than the end face of the second stop facing the first thin-walled bearing.

[0011] Furthermore, the height difference between the end face of the first stop block facing the first thin-walled bearing and the end face of the second stop block facing the first thin-walled bearing is greater than 0 and less than 0.2 mm.

[0012] Furthermore, a second stepped surface is provided on the inner wall of the shaft groove, and an annular groove is recessed on the outer wall of the hollow shaft at the corresponding position of the second stepped surface, and an adhesive layer is filled at the second stepped surface and the annular groove.

[0013] Furthermore, the adhesive layer is an AB adhesive layer.

[0014] Compared with the prior art, the advantages of this utility model are as follows: This utility model connects the two sides of the hub motor by setting a hollow shaft that passes through the stator support and the rotor yoke, so that the wires can pass through the hollow shaft to connect the electrical equipment on both sides of the hub motor, thereby enhancing the expandability of the hub motor. For example, decorative lights can be installed on the outer surface of the rotor yoke. In addition, the hollow shaft can also be used as the mounting or fixing position for other functional modules. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is an exploded view of the present invention;

[0017] Figure 3 This is a longitudinal sectional view of the present invention;

[0018] Figure 4 for Figure 3 Enlarged view of A in the middle;

[0019] Figure 5 This is a schematic diagram of the hollow shaft of this utility model;

[0020] As shown in the figure, 1 hollow shaft, 1.1 annular groove, 1.2 first stop block, 1.3 second stop block, 2 stator support, 2.1 channel, 2.2 annular protrusion, 3 stator winding, 4 magnet ring, 5 rotor yoke, 5.1 shaft groove, 5.2 first step surface, 5.3 second step surface, 6 first thin-walled bearing, 7 second thin-walled bearing, 8 adhesive layer. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments.

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] like Figure 1-5As shown, this utility model provides a novel light-load hub motor, including a stator support 2, a stator winding 3, a magnet ring 4, and a rotor yoke 5 arranged sequentially from the inside to the outside. The stator winding 3 is fixed on the stator support 2, and the magnet ring 4 is interference-fitted with the rotor yoke 5. A synchronously rotating hollow shaft 1 is provided at the center of the rotor yoke 5. The two ends of the hollow shaft 1 pass through the stator support 2 and the rotor yoke 5, respectively. The stator support 2 is rotatably engaged with the hollow shaft 1 through a first thin-walled bearing 6, and the stator support 2 is rotatably engaged with the rotor yoke 5 through a second thin-walled bearing 7.

[0027] This invention connects the two sides of a hub motor by setting a hollow shaft 1 that passes through the stator support 2 and the rotor yoke 5, allowing wires to pass through the hollow shaft 1 to connect electrical equipment on both sides of the hub motor, thereby enhancing the expandability of the hub motor. For example, decorative lights can be installed on the outer surface of the rotor yoke 5. Generally, a circuit board is installed on one side of the stator support 2, and the rotor yoke 5 facing outward is suitable for installing cool decorative lights. The hollow shaft 1 makes it convenient for the circuit board on one side of the stator support 2 to supply power to the decorative lights facing outward on the rotor yoke 5 through wires. In addition, the hollow shaft 1 can also be used as an installation or fixing position for other functional modules.

[0028] Preferably, the rotor yoke 5 has a groove 5.1 at its center for interference fit with the hollow shaft 1, and the stator support 2 has a channel 2.1 at its center for the hollow shaft 1 to pass through. The hollow shaft 1 connects and passes through the rotor yoke 5 and the stator support 2 through the groove 5.1 and the channel 2.1. The first thin-walled bearing 6 is installed between the inner wall of the channel 2.1 and the outer wall of the hollow shaft 1, allowing the stator support 2 and the hollow shaft 1 to rotate relatively smoothly. The second thin-walled bearing 7 is installed between the inner wall of the channel 2.1 and the outer wall of the groove 5.1, allowing the stator support 2 and the rotor yoke 5 to rotate relatively smoothly. The first thin-walled bearing 6 and the second thin-walled bearing 7 are small in size, reducing the space occupied during installation, thereby further reducing the size of the hub motor.

[0029] Preferably, a ring protrusion 2.2 is provided in the channel 2.1 between the first thin-walled bearing 6 and the second thin-walled bearing 7. The end face of the ring protrusion 2.2 facing the first thin-walled bearing 6 is in contact with the first thin-walled bearing 6, and the end face of the ring protrusion 2.2 facing the second thin-walled bearing 7 is in contact with the second thin-walled bearing 7, thereby axially positioning the first thin-walled bearing 6 and the second thin-walled bearing 7 and preventing them from moving.

[0030] Preferably, the outer wall of the shaft groove 5.1 is provided with a first stepped surface 5.2 for blocking the second thin-walled bearing 7. The first stepped surface 5.2 is provided at the other end of the second thin-walled bearing 7 corresponding to the annular protrusion 2.2, thereby cooperating with the annular protrusion 2.2 to complete the axial limiting of the second thin-walled bearing 7.

[0031] Preferably, the hollow shaft 1 has a preload portion at one end facing the stator bracket 2 for blocking the first thin-walled bearing 6. The preload portion is provided at the other end of the first thin-walled bearing 6 corresponding to the annular protrusion 2.2, thereby cooperating with the annular protrusion 2.2 to complete the axial limiting of the first thin-walled bearing 6.

[0032] Preferably, the pre-tightening portion includes a plurality of equally spaced first stop blocks 1.2 and a plurality of equally spaced second stop blocks 1.3, which are spaced apart. The end face of the first stop block 1.2 facing the first thin-walled bearing 6 is lower than the end face of the second stop block 1.3 facing the first thin-walled bearing 6. Preferably, the second stop block 1.3 abuts against the end face of the first thin-walled bearing 6. When subjected to axial pressure from the first thin-walled bearing 6, the second stop block 1.3 undergoes elastic deformation to suppress the vibration and noise of the first thin-walled bearing 6. After the deformation of the second stop block 1.3 exceeds a certain degree, The first stop 1.2 also abuts against the end face of the first thin-walled bearing 6, and together with the second stop 1.3, it bears the axial pressure of the first thin-walled bearing 6, preventing the second stop 1.3 from breaking or the first thin-walled bearing 6 from slipping. The height difference between the end faces of the first stop 1.2 and the second stop 1.3 serves as an early warning for the first thin-walled bearing 6, eliminating bearing clearance and reducing noise. Preferably, the height difference between the end face of the first stop 1.2 facing the first thin-walled bearing 6 and the end face of the second stop 1.3 facing the first thin-walled bearing 6 is greater than 0 and less than 0.2 mm, to prevent the second stop 1.3 from being excessively deformed.

[0033] Preferably, the inner wall of the shaft groove 5.1 is provided with a second stepped surface 5.3, and the outer wall of the hollow shaft 1 is recessed with an annular groove 1.1 corresponding to the second stepped surface 5.3. The second stepped surface 5.3 and the annular groove 1.1 are filled with an adhesive layer 11, thereby fixing the hollow shaft 1 and the rotor yoke 5 by the adhesiveness of the adhesive layer 11. By setting the annular groove 1.1, the contact area between the adhesive layer 11 and the hollow shaft 1 is increased, thereby enhancing the firmness of the adhesive layer 11 and forming a snap-fit ​​between the adhesive layer 11 and the hollow shaft 1, thereby strengthening the axial fixation of the hollow shaft 1 and the rotor yoke 5.

[0034] Preferably, the adhesive layer 11 is an AB adhesive layer, which has good insulation and compressive strength. AB adhesive refers to a two-component mixed curing adhesive, one component of which is the adhesive itself and the other component is a curing agent. It can be cured at room temperature. Component A is acrylic modified epoxy or epoxy resin, or contains catalysts and other additives. Component B is modified amine or other curing agents, or contains catalysts and other additives. This AB adhesive is a commercially available product.

[0035] When in use, the hub motor can be installed on the sweeper. Generally, one side of the stator bracket 2 faces inward and the rotor yoke 5 faces outward, which can provide some protection for the magnet ring 4 and the stator winding 3. A cool decorative light can be installed on the outside of the rotor yoke 5. The circuit board on one side of the stator bracket 2 supplies power to the decorative light through wires. The wires can be electrically connected to the circuit board through the hollow shaft 1, which is convenient for wiring.

[0036] Unless otherwise specified, the materials, reagents, and experimental equipment involved in this embodiment of the utility model are all commercially available products in the field of motors.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A new light-duty wheel hub motor, characterized in that, The device includes a stator support, a stator winding, a magnet ring, and a rotor yoke arranged sequentially from the inside out. The stator winding is fixed to the stator support, and the magnet ring is interference-fitted with the rotor yoke. A synchronously rotating hollow shaft is provided at the center of the rotor yoke, and the two ends of the hollow shaft pass through the stator support and the rotor yoke, respectively. The stator support is rotatably engaged with the hollow shaft through a first thin-walled bearing, and the stator support is rotatably engaged with the rotor yoke through a second thin-walled bearing.

2. A new type of light-duty wheel hub motor according to claim 1, characterized in that, The rotor yoke has a groove at its center for interference fit with the hollow shaft, and the stator support has a channel at its center for the hollow shaft to pass through. The first thin-walled bearing is installed between the inner wall of the channel and the outer wall of the hollow shaft, and the second thin-walled bearing is installed between the inner wall of the channel and the outer wall of the groove.

3. A new type of light-duty wheel hub motor according to claim 2, characterized in that, The channel has a ring protrusion between the first thin-walled bearing and the second thin-walled bearing. The end face of the ring protrusion facing the first thin-walled bearing is in contact with the first thin-walled bearing, and the end face of the ring protrusion facing the second thin-walled bearing is in contact with the second thin-walled bearing.

4. The new light load wheel hub motor according to claim 3, characterized in that, The outer wall of the shaft groove is provided with a first stepped surface for blocking the second thin-walled bearing.

5. The new type light-duty wheel hub motor according to claim 3, characterized in that, The hollow shaft has a preload portion at one end facing the stator support for blocking the first thin-walled bearing.

6. A new type of light-duty wheel hub motor according to claim 5, characterized in that, The pre-tightening part includes a plurality of first blocks and a plurality of second blocks arranged in a ring at equal intervals. The first blocks and the second blocks are distributed at intervals. The end face of the first block facing the first thin-walled bearing is lower than the end face of the second block facing the first thin-walled bearing.

7. A new type of light-duty wheel hub motor according to claim 6, characterized in that, The height difference between the end face of the first stop block facing the first thin-walled bearing and the end face of the second stop block facing the first thin-walled bearing is greater than 0 and less than 0.2 mm.

8. The new type light-duty wheel hub motor according to claim 5, characterized in that, The inner wall of the shaft groove is provided with a second stepped surface, and the outer wall of the hollow shaft is recessed with a ring groove corresponding to the second stepped surface. The second stepped surface and the ring groove are filled with an adhesive layer.

9. A novel light-load hub motor according to claim 8, characterized in that, The adhesive layer is an AB adhesive layer.

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