Inner rotor motor assembly and hub motor

Abstract

The utility model discloses an inner rotor motor assembly comprising a gear shaft, the gear shaft is connected with a motor front cover and a gear support through first rolling bearings, and the position, between the two first rolling bearings, of the gear shaft is connected with a rotor through a one-way needle bearing. Gaps are reserved between the two ends of the one-way needle bearing and the two first rolling bearings and between the two ends of the rotor and the two first rolling bearings, and plane thrust bearings are fixed between the front end face of the rotor and the rear end face of the motor front cover and between the rear end face of the rotor and the front end face of the gear support. The utility model further discloses the hub motor. According to the scheme, the plane thrust bearings are arranged between the rotor and the motor front cover and between the gear support and the rotor, so that the effect of correcting the axial parallelism of the rotor and the gear shaft is achieved, the influence of unilateral magnetic pulling force between the stator and the rotor on the one-way needle bearing is restrained, and meanwhile axial positioning in the motor is guaranteed; the first rolling bearing on the gear shaft keeps a clearance state with the rotor, so that the rotor rotates smoothly.

Description

Technical Field

[0001] The utility model relates to the technical field of hub motors, in particular to an inner rotor motor assembly and a hub motor. Background Art

[0002] At present, the clutch structure of the inner rotor hub motor on the market is usually a one-way gear ring or a separately installed clutch. Specifically, a one-way clutch (hereinafter described as a one-way needle bearing) is set between the inner wall of the rotor and the gear shaft, and then a gasket is set at both ends of the one-way needle bearing. The characteristics of the one-way needle bearing are used (that is, the needle roller group of the one-way needle bearing holds the gear shaft tightly in one direction, which is an integrated state, and the other direction loosens the gear shaft, which is a gap state). When the direction of the gear shaft is consistent with the direction of the needle roller group, the rotor and the gear shaft rotate relative to each other. Otherwise, the rotor and the gear shaft rotate together, thereby realizing the clutch function and protecting the motor.

[0003] In the above scheme, the rotor is not axially fixed. Since a large magnetic pull is generated between the rotor and the stator, it is easy to cause rotor eccentricity, which in turn affects the axial parallelism of the rotor and the gear shaft. After the rotor is eccentric, interference or increased rotational resistance is likely to occur, affecting the normal rotation of the motor rotor; at the same time, when the friction on the gasket surface is large and there is no end face gap, it is easy to cause the outer ring of the one-way needle roller bearing and the inner ring of the rolling bearing at both axial ends of the gasket to be unable to slide flexibly, thereby affecting the normal rotation of the rotor and causing the one-way clutch to fail. Summary of the Invention

[0004] In response to the current technical problems, the present invention provides an inner rotor motor assembly and a hub motor to solve the problems in the prior art.

[0005] In order to achieve the above-mentioned purpose of the invention, the present invention provides the following technical solutions:

[0006] An inner rotor motor assembly includes a gear shaft, the front end of the gear shaft is connected to the motor front cover via a first rolling bearing, the position near the middle of the gear shaft is connected to the gear bracket via another first rolling bearing, the position on the gear shaft located between the two first rolling bearings is connected to the rotor via a one-way needle roller bearing, and gaps are left between the two ends of the one-way needle roller bearing and the two ends of the rotor and the two first rolling bearings, a plurality of main magnets are distributed on the outer periphery of the rotor, a stator is fixed to the position of the gear bracket and the motor front cover corresponding to the rotor, a planar thrust bearing is fixed between the front end face of the rotor and the rear end face of the motor front cover, and another planar thrust bearing is fixed between the rear end face of the rotor and the front end face of the gear bracket.

[0007] Preferably, the one-way needle roller bearing is loosely sleeved on the gear shaft, and the outer ring of the one-way needle roller bearing is fixedly connected to the inner wall of the rotor.

[0008] Preferably, a first mounting cavity is respectively provided on the front and rear end surfaces of the rotor, a second mounting cavity is provided on the end surface of the motor front cover facing the rotor, and a third mounting cavity is provided on the end surface of the gear bracket facing the rotor, one end of one of the planar thrust bearings abuts in the second mounting cavity, and the other end abuts in one of the first mounting cavities, one end of another planar thrust bearing abuts in the other first mounting cavity, and the other end abuts in the third mounting cavity.

[0009] A hub motor comprises a hub shell, a hub cover and an inner rotor motor assembly, wherein the inner rotor motor assembly is arranged in the area enclosed by the hub shell and the hub cover, the front half shaft is connected to the motor front cover, the hub cover is sleeved on the front half shaft through a second rolling bearing, the hub shell and the hub cover are axially fixedly connected, an inner ring gear is fixed on the inner side of the hub shell, a double gear is connected to the gear bracket, the large gear of the double gear is meshed with the gear shaft, and the small gear of the double gear is meshed with the inner ring gear, the gear bracket is also connected to the rear half shaft, a card base assembly is sleeved on the rear half shaft through a third rolling bearing, and the card base assembly is fixedly connected to the hub shell.

[0010] Preferably, a speed measuring magnet is provided on the inner side of the hub cover.

[0011] Preferably, a fixed shaft is distributed on the gear bracket, and the double gear is connected to the fixed shaft.

[0012] Preferably, the axis center line of the rear half shaft, the axis center line of the front half shaft and the axis center line of the gear shaft are located on the same straight line.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: this solution corrects the axial parallelism of the rotor and the gear shaft by arranging a planar thrust bearing between the rotor and the front cover of the motor and between the gear bracket and the rotor, thereby suppressing the influence of the unilateral magnetic pull between the stator and the rotor on the one-way needle roller bearing, and also ensuring the axial positioning inside the motor; the first rolling bearing on the gear shaft maintains a gap with the rotor, so that the rotor rotates smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of the inner rotor motor assembly of the present invention;

[0015] Figure 2 for Figure 1 AA section view in;

[0016] Figure 3 for Figure 1Schematic diagram of the structure of the motor front cover;

[0017] Figure 4 for Figure 1 Schematic diagram of the structure of the gear bracket;

[0018] Figure 5 for Figure 1 A cross-sectional view of the rotor in FIG;

[0019] Figure 6 This is a schematic diagram of the hub motor of the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below with reference to test examples and specific implementation methods. However, this should not be construed as limiting the scope of the present invention to the following embodiments. All technologies implemented based on the present invention fall within the scope of the present invention.

[0021] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] As attached Figure 1 -Attached Figure 5 An inner rotor motor assembly shown includes a gear shaft 43, the front end of which is connected to the motor front cover 42 via a first rolling bearing 47, the position near the middle of the gear shaft 43 is connected to the gear bracket 41 via another first rolling bearing 47, the position between the two first rolling bearings 47 on the gear shaft 43 is connected to the rotor 442 via a one-way needle bearing 45, and gaps are left between both ends of the one-way needle bearing 45 and both ends of the rotor 442 and the two first rolling bearings 47; the one-way needle bearing 45 is loosely sleeved on the gear shaft 43, and the outer ring of the one-way needle bearing 45 is fixedly connected to the inner wall of the rotor 442.

[0023] A plurality of main magnets 443 are distributed on the outer periphery of the rotor 442 , and a stator 441 is fixed at a position corresponding to the rotor 442 in the gear bracket 41 and the motor front cover 42 , with a fixed gap being left between the main magnets 443 and the stator 441 .

[0024] A planar thrust bearing 46 is fixed between the front end face of the rotor 442 and the rear end face of the motor front cover 42. Another planar thrust bearing 46 is fixed between the rear end face of the rotor 442 and the front end face of the gear bracket 41. Specifically, a first mounting cavity 4421 is respectively defined on the front and rear end faces of the rotor 442. A second mounting cavity 421 is defined on the end face of the motor front cover 42 facing the rotor 442. A third mounting cavity 412 is defined on the end face of the gear bracket 41 facing the rotor 442. One end of one planar thrust bearing 46 abuts within the second mounting cavity 421, and the other end abuts within one of the first mounting cavities 4421. Another planar thrust bearing 46 abuts one end within the other first mounting cavity 4421, and the other end abuts within the third mounting cavity 412.

[0025] Fixed shafts 411 are evenly distributed on the gear bracket 41 . The axis of the fixed shaft 411 is parallel to the axis of the gear shaft 43 . The fixed shaft 411 is connected to the double gear 3 .

[0026] As attached Figure 6 The illustrated in-wheel hub motor includes a hub shell 21, a hub cover 11, and the inner rotor motor assembly. The hub shell 21 and the hub cover 11 are axially fixedly connected. The inner rotor motor assembly is disposed within the area enclosed by the hub shell 21 and the hub cover 11. The motor front cover 42 is connected to the front axle 6. The hub cover 11 is mounted on the front axle 6 via a second rolling bearing 12. An inner ring gear 22 is fixed to the inner side of the hub shell 21. A double gear 3 is connected to the gear bracket 41. The large gear of the double gear 3 meshes with the pinion 43, and the small gear of the double gear 3 meshes with the inner ring gear 22. The gear bracket 41 is also connected to the rear axle 5. The base assembly 23 is mounted on the rear axle 5 via a third rolling bearing 4 and is fixedly connected to the hub shell 21. The axis of the rear axle 5, the axis of the front axle 6, and the axis of the pinion 43 are aligned.

[0027] In this embodiment, a speed measuring magnet 13 is provided on the inner side of the hub cover 11 .

[0028] In this embodiment, there is a gap between the end faces of the one-way needle roller bearing and the end faces of the rotor and the end face of the first rolling bearing, which disconnects the contact between the rotor end face and the first rolling bearing end face. The planar thrust bearing includes two parallel end plates and a needle roller group. The needle roller group rolls and rotates between the two end plates. The two end plates of one planar thrust bearing are respectively abutted against the first mounting cavity and the second mounting cavity, and the two end plates of the other planar thrust bearing are respectively abutted against the first mounting cavity and the third mounting cavity. This scheme can not only adjust the parallelism of the rotor and the gear shaft, but also ensure the axial dimension positioning inside the one-way needle roller bearing motor, and a gap is maintained between the first rolling bearing end face on the gear shaft and the rotor, which can achieve a compact structure and make the one-way clutch rotate flexibly.

[0029] The above describes preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solution that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the prior art should be within the scope of protection defined by the claims.

Claims

1. An inner rotor motor assembly, characterized in that: The invention comprises a gear shaft (43), the front end of which is connected to a motor front cover (42) via a first rolling bearing (47), the position of the gear shaft (43) near the middle thereof is connected to a gear support (41) via another first rolling bearing (47), the position of the gear shaft (43) between the two first rolling bearings (47) is connected to a rotor (442) via a one-way needle roller bearing (45), and both ends of the one-way needle roller bearing (45) and both ends of the rotor (442) are connected to the two first rolling bearings. A gap is left between the bearings (47); a plurality of main magnets (443) are distributed on the outer periphery of the rotor (442); a stator (441) is fixed at a position corresponding to the rotor (442) in the gear bracket (41) and the motor front cover (42); a planar thrust bearing (46) is fixed between the front end face of the rotor (442) and the rear end face of the motor front cover (42); and another planar thrust bearing (46) is fixed between the rear end face of the rotor (442) and the front end face of the gear bracket (41).

2. An inner rotor motor assembly according to claim 1, characterized in that: The one-way needle roller bearing (45) is sleeved on the gear shaft (43) with a gap, and the outer ring of the one-way needle roller bearing (45) is fixedly connected to the inner wall of the rotor (442).

3. The inner rotor motor assembly according to claim 1, characterized in that: The rotor (442) is provided with first mounting cavities (4421) on its front and rear end surfaces respectively; the motor front cover (42) is provided with a second mounting cavity (421) on its end surface facing the rotor (442); the gear bracket (41) is provided with a third mounting cavity (412) on its end surface facing the rotor (442); one end of one of the planar thrust bearings (46) abuts against the second mounting cavity (421), and the other end abuts against one of the first mounting cavities (4421); one end of another of the planar thrust bearings (46) abuts against another of the first mounting cavities (4421), and the other end abuts against the third mounting cavity (412).

4. A hub motor, characterized in that: The invention comprises a wheel hub shell (21), a wheel hub cover (11) and an inner rotor motor assembly according to any one of claims 1 to 3, wherein the inner rotor motor assembly is arranged in an area enclosed by the wheel hub shell (21) and the wheel hub cover (11), the motor front cover (42) is connected to a front half shaft (6), the wheel hub cover (11) is sleeved on the front half shaft (6) via a second rolling bearing (12), the wheel hub shell (21) and the wheel hub cover (11) are axially fixedly connected, and the wheel hub shell ( An inner gear ring (22) is fixed on the inner side of the gear bracket (41), a double gear (3) is connected to the gear bracket (41), the large gear of the double gear (3) is meshed with the gear shaft (43), and the small gear of the double gear (3) is meshed with the inner gear ring (22), and a rear half shaft (5) is also connected to the gear bracket (41), a base assembly (23) is sleeved on the rear half shaft (5) through a third rolling bearing (4), and the base assembly (23) is fixedly connected to the hub shell (21).

5. The hub motor according to claim 4, characterized in that: A speed measuring magnet (13) is provided on the inner side of the hub cover (11).

6. The wheel hub motor according to claim 4, characterized in that: A fixed shaft (411) is disposed on the gear bracket (41), and the double gear (3) is connected to the fixed shaft (411).

7. The wheel hub motor according to claim 4, characterized in that: The axis center line of the rear half shaft (5), the axis center line of the front half shaft (6) and the axis center line of the gear shaft (43) are located on the same straight line.

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