Wheel hub motor stator support

Abstract

The utility model provides a wheel hub motor stator support, and belongs to the technical field of machinery. The problem that an existing support is not stable in structure is solved. The hub motor stator support comprises a motor shaft and an iron core bracket with a central tube, the motor shaft vertically penetrates through the central tube, the inner side face of the central tube is composed of a first upper conical surface, a first circumferential surface and a first lower conical surface which are continuously distributed in the axial direction of the central tube, and the diameters of the first upper conical surface and the first lower conical surface are gradually increased from top to bottom. The maximum outer diameter of the first upper conical surface and the minimum outer diameter of the first lower conical surface are the same as the outer diameter of the first circumferential surface; the outer wall of the motor shaft is provided with a second upper conical surface which is matched and clung to the first upper conical surface, a second circumferential surface which is matched and clung to the first circumferential surface, and a second lower conical surface which is matched and clung to the first lower conical surface; the two ends of the center pipe are fixedly connected with the motor shaft in a laser welding mode. The hub motor stator support is stable in structure.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mechanical technical field relates to a wheel hub motor especially a wheel hub motor stator support. BACKGROUND

[0002] The motor stator is the stationary part of the motor, and together with the rotating rotor, it constitutes the core structure of the motor.

[0003] The existing stator structure such as the motor stator of a wheel hub motor disclosed by Chinese patent library (application number: 202122335832.7) includes a stator core, a stator winding, a core support plate, and a motor shaft. The stator core is annular, and a plurality of threading holes for winding the stator winding are uniformly provided on the stator core. The core support plate is disc-shaped, and its outer peripheral edge is fixedly welded to the inner ring of the stator core and forms a welding band. A mounting hole is provided in the middle of the core support plate, and the motor shaft is fixedly welded in the mounting hole.

[0004] In the above-mentioned stator, the motor shaft and the core support plate are fixed together by ordinary welding technology. Welding stress may occur during the welding process, causing deformation or cracks at the connection site, affecting the stability and reliability of the connection. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above-mentioned problems existing in the prior art and provides a wheel hub motor stator support with stable structure.

[0006] The utility model can be realized by the following technical scheme: a wheel hub motor stator support includes a motor shaft and a core bracket with a center tube, and the motor shaft is vertically arranged in the center tube. The inner side surface of the center tube is composed of a first upper conical surface, a first circular surface, and a first lower conical surface which are continuously distributed along the axial direction of the center tube. The diameters of the first upper conical surface and the first lower conical surface gradually increase from top to bottom, and the maximum outer diameter of the first upper conical surface and the minimum outer diameter of the first lower conical surface are the same as the outer diameter of the first circular surface. The outer wall of the motor shaft has a second upper conical surface matching and abutting the first upper conical surface, a second circular surface matching and abutting the first circular surface, and a second lower conical surface matching and abutting the first lower conical surface. The two ends of the center tube are fixedly connected with the motor shaft by laser welding.

[0007] The two ends of the center tube are fixedly connected with the motor shaft by laser welding, which can effectively reduce material deformation, cracking, and damage to the surrounding area, effectively strengthen the strength and stability of the connection between the motor shaft and the core bracket, and improve the structural stability of the stator support.

[0008] Meanwhile, the two ends of the center tube are in contact with the motor shaft through conical surfaces, which can improve the coaxiality between the center tube and the motor shaft, and can also enhance the close fit between the two ends of the center tube and the motor shaft, ensuring that the laser welding process is stable and accurate, thereby further improving the structural stability of the stator support.

[0009] In the above-mentioned hub motor stator support, the above-mentioned core bracket further comprises a support cylinder sleeved outside the center tube, and the support cylinder and the center tube are connected together through a ring body arranged therebetween; an annular stopper is formed on the outer wall of the lower end of the support cylinder and is coaxial with the support cylinder. The design of the annular stopper is used to limit the position of the core sleeve and facilitate the installation of the core.

[0010] In the above-mentioned hub motor stator support, the inner walls of the two ends of the support cylinder are conical support surfaces, and the two support surfaces respectively extend to the two end faces of the ring body, and the diameters of the two support surfaces gradually decrease towards the ring body, so as to effectively enhance the overall strength and compression resistance of the support cylinder, thereby stably supporting the stator core.

[0011] In the above-mentioned hub motor stator support, one of the end faces of the ring body is formed with a ring of ribs, and the two ends of the ribs respectively extend to the inner wall of the support cylinder and the outer wall of the center tube, so as to further enhance the strength of the core bracket.

[0012] In the above-mentioned hub motor stator support, a plurality of weight reduction holes are axially penetrated through the ring body, which are used to reduce the weight of the core bracket.

[0013] In the above-mentioned hub motor stator support, the number of weight reduction holes is the same as that of ribs, and the weight reduction holes and the ribs are alternately distributed along the circumference of the ring body, so as to ensure that the weight of the core bracket is reduced while the core bracket still maintains good strength.

[0014] Compared with the prior art, the hub motor stator support has the following advantages:

[0015] 1. The two ends of the center tube are connected to the motor shaft by laser welding, which can effectively reduce material deformation, cracking and damage to the surrounding area, effectively enhance the strength and stability of the connection between the motor shaft and the core bracket, and improve the structural stability of the stator support.

[0016] 2. The two ends of the center tube are in contact with the motor shaft through conical surfaces, which can improve the coaxiality between the center tube and the motor shaft, and can also enhance the close fit between the two ends of the center tube and the motor shaft, ensuring that the laser welding process is stable and accurate, thereby further improving the structural stability of the stator support. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a perspective view of the hub motor stator support.

[0018] Figure 2is a sectional view of the stator support of the hub motor.

[0019] Figure 3 is Figure 2 is an enlarged schematic view at A in the figure.

[0020] Figure 4 is a structural schematic view of the motor shaft.

[0021] In the figure, 1, motor shaft; 1a, second upper conical surface; 1b, second circumferential surface; 1c, second lower conical surface; 2, core bracket; 2a, center tube; 2a1, first upper conical surface; 2a2, first circumferential surface; 2a3, first lower conical surface; 2b, support cylinder; 2b1, annular stopper; 2b2, support surface; 2c, ring body; 2c1, weight-reducing hole; 2d, rib. DETAILED DESCRIPTION

[0022] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0023] As Figure 1 shown, the stator support of the hub motor comprises a motor shaft 1 and a core bracket 2.

[0024] Specifically,

[0025] The core bracket 2 is of an integral structure, comprising a center tube 2a, a support cylinder 2b sleeved outside the center tube 2a, and a ring body 2c for connecting the center tube 2a and the support cylinder 2b. Among them, the ring body 2c, the center tube 2a and the support cylinder 2b are coaxially arranged, the ring body 2c is between the center tube 2a and the support cylinder 2b, and the ring body 2c is connected to the outer wall of the center tube 2a and the inner wall of the support cylinder 2b on both sides. The lower end outer wall of the support cylinder 2b is formed with an annular stopper 2b1 coaxial with the support cylinder 2b. In the actual product, the stator core in the form of a ring is sleeved outside the support cylinder 2b and is tightly connected with the support cylinder 2b, and the design of the annular stopper 2b1 is used to limit the position of the core sleeve, facilitating the installation of the core.

[0026] The motor shaft 1 and the center tube 2a are coaxially arranged, and the motor shaft 1 is vertically arranged in the center tube 2a. Figures 2 to 4As shown, the inner side of the center tube 2a is composed of a first upper taper surface 2a1, a first circumferential surface 2a2 and a first lower taper surface 2a3 which are distributed along the center tube 2a in axial direction, the diameters of the first upper taper surface 2a1 and the first lower taper surface 2a3 gradually increase from top to bottom, and the maximum outer diameter of the first upper taper surface 2a1 and the minimum outer diameter of the first lower taper surface 2a3 are the same as the outer diameter of the first circumferential surface 2a2; the outer wall of the motor shaft 1 has a second upper taper surface 1a which matches and abuts against the first upper taper surface 2a1, a second circumferential surface 1b which matches and abuts against the first circumferential surface 2a2, and a second lower taper surface 1c which matches and abuts against the first lower taper surface 2a3; the two ends of the center tube 2a are fixedly connected with the motor shaft 1 by laser welding.

[0027] The two ends of the center tube 2a are fixedly connected with the motor shaft 1 by laser welding, which can effectively reduce material deformation, cracking and damage to the surrounding area, effectively strengthen the strength and stability of the connection between the motor shaft 1 and the core bracket 2, and improve the structural stability of the stator support.

[0028] Meanwhile, the two ends of the center tube 2a are in contact with the motor shaft 1 through taper surface matching, which can not only improve the coaxiality between the center tube 2a and the motor shaft 1, but also enhance the close-fitting density of the two ends of the center tube 2a and the motor shaft 1, ensuring the stability and precision of the laser welding process, thereby further improving the structural stability of the stator support.

[0029] Further, the inner walls of the two ends of the support cylinder 2b are both support surfaces 2b2 which are tapered, and the two support surfaces 2b2 extend to the two end faces of the ring body 2c respectively, and the diameters of the two support surfaces 2b2 gradually decrease towards the ring body 2c, so as to effectively strengthen the overall strength and compression resistance of the support cylinder 2b, thereby realizing stable support of the stator core.

[0030] As shown in the drawings, Figure 1 One end face of the ring body 2c is formed with a ring of ribs 2d, and the two ends of the ribs 2d extend to the inner wall of the support cylinder 2b and the outer wall of the center tube 2a respectively, so as to further strengthen the strength of the core bracket 2. A plurality of weight-reducing holes 2c1 are axially penetrated through the ring body 2c, which are used to reduce the weight of the core bracket 2. The number of the weight-reducing holes 2c1 is the same as that of the ribs 2d, and the weight-reducing holes 2c1 and the ribs 2d are alternately distributed along the circumference of the ring body 2c, so as to ensure the weight reduction of the core bracket 2 while maintaining good strength of the core bracket 2.

[0031] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A hub motor stator support, comprising a motor shaft (1) and an iron core bracket (2) having a central tube (2a), wherein the motor shaft (1) is vertically inserted into the central tube (2a), characterized in that, The inner surface of the central tube (2a) is composed of a first upper conical surface (2a1), a first circumferential surface (2a2), and a first lower conical surface (2a3) continuously distributed along the axial direction of the central tube (2a). The diameters of the first upper conical surface (2a1) and the first lower conical surface (2a3) gradually increase from top to bottom, and the maximum outer diameter of the first upper conical surface (2a1) and the minimum outer diameter of the first lower conical surface (2a3) are the same as the outer diameter of the first circumferential surface (2a2). The outer wall of the motor shaft (1) has a second upper conical surface (1a) that matches and abuts the first upper conical surface (2a1), a second circumferential surface (1b) that matches and abuts the first circumferential surface (2a2), and a second lower conical surface (1c) that matches and abuts the first lower conical surface (2a3). Both ends of the central tube (2a) are fixed to the motor shaft (1) by laser welding.

2. The hub motor stator bracket according to claim 1, characterized in that, The aforementioned iron core bracket (2) also includes a support cylinder (2b) sleeved outside the central tube (2a), and the support cylinder (2b) and the central tube (2a) are connected together by a ring (2c) set between them; an annular flange (2b1) coaxial with the support cylinder (2b) is formed on the lower outer wall of the support cylinder (2b).

3. The hub motor stator bracket according to claim 2, characterized in that, The inner walls at both ends of the support cylinder (2b) are conical support surfaces (2b2), which extend to both ends of the ring (2c), and the diameters of the two support surfaces (2b2) ​​gradually decrease towards the ring (2c).

4. The hub motor stator bracket according to claim 2 or 3, characterized in that, A ring of ribs (2d) is formed on one end face of the ring (2c), and the two ends of the ribs (2d) extend to the inner wall of the support cylinder (2b) and the outer wall of the central tube (2a), respectively.

5. The hub motor stator bracket according to claim 2 or 3, characterized in that, Multiple weight-reducing holes (2c1) are axially penetrating the ring (2c).

6. The hub motor stator bracket according to claim 5, characterized in that, The number of weight-reducing holes (2c1) and ribs (2d) is the same, and the weight-reducing holes (2c1) and ribs (2d) are alternately distributed along the circumference of the ring (2c).

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