Mounting structure of brushless motor rotor

Abstract

The invention relates to an installation structure of a brushless motor rotor, which comprises a rotor, and a through shaft hole is formed in the center of the rotor and is used for installing a steel shaft on the rotor along the axial direction; the magnet and the limiting sleeve are arranged on the periphery of the rotor; an elastic limiting structure is arranged on the rotor around the shaft hole; the elastic limiting structure comprises a limiting side and an elastic side which are arranged in the circumferential direction, and the limiting side and the elastic side jointly form an elastic limiting channel coaxial with the shaft hole. The limiting side is formed on the limiting claw and limits the steel shaft in the radial direction; the elastic side is formed on the elastic claw, and the elastic claw can be bent and deformed relative to the shaft hole, so that a dynamic gap is formed between the elastic side and the steel shaft. The beneficial effects of the invention lie in that the elastic limiting structure is arranged, under the condition that the coaxiality of the steel shaft and the rotor is maintained, through dynamic gap compensation, the gap between the rotor and the steel shaft is eliminated in real time, the rotor is dynamically attached to the steel shaft, the rigid collision between the rotor and the steel shaft due to radial shaking is avoided, and the mechanical noise of the motor is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the motor technical field, especially to a brushless motor rotor installation structure. BACKGROUND

[0002] In the inner rotor brushless motor, the shell is used as the stator, and the inside and the main shaft constitute the rotor assembly. In operation, the rotor assembly rotates, and the shell as the stator is fixed with the motor base.

[0003] However, in the prior art brushless motor, the rotor is usually installed on the steel shaft in a clearance fit manner, that is, there is a clearance between the rotor and the steel shaft. In this assembly relationship, when the rotor rotates under the action of the magnetic force of the stator, it will be offset, so that the hole wall of the center shaft hole of the rotor hits the steel shaft, generating noise. SUMMARY

[0004] In order to solve the above problems in the prior art, the present application provides a brushless motor rotor installation structure.

[0005] The above problems of the present application are solved by the following technical solutions: A brushless motor rotor installation structure, comprising, a rotor, the rotor is provided with a through shaft hole in the center, for installing the steel shaft on the rotor along the axial direction; a magnet, the magnet is sleeved on the outer periphery of the rotor and drives the rotor to rotate synchronously around the axis L; an elastic limiting structure is arranged around the shaft hole on the rotor; the elastic limiting structure comprises a limiting side and an elastic side arranged in the circumferential direction, and the limiting side and the elastic side jointly form an elastic limiting channel coaxial with the shaft hole; the limiting side is formed on a limiting claw and limits the steel shaft in the radial direction; the elastic side is formed on an elastic claw, and the elastic claw can be bent and deformed relative to the shaft hole, so that the elastic side and the steel shaft have a dynamic clearance.

[0006] The further arrangement of the above technical solution is that the limiting claw is integrally formed on the rotor, and the rotor has at least two connection points; The projection of the two connection points and the limiting side on the same plane is arranged in a triangular structure.

[0007] The further arrangement of the above technical solution is that the limiting claw comprises a clamping claw with an arc-shaped cross section, which extends along the axis L; the back of the clamping claw is radially formed with a limiting wall; the clamping claw is provided with a first connection point, and the limiting wall is provided with a second connection point.

[0008] The further setting of the technical scheme is that the elastic slot is arranged axially on the rotor, and the shaft hole is formed in the slot bottom of the elastic slot; the clamping jaw is arranged in the axial extension from the slot bottom of the elastic slot. The first connection site on the clamping jaw is connected to the slot bottom, and the second limiting site on the limiting wall is connected to the slot wall of the elastic slot.

[0009] The further setting of the technical scheme is that the outer wall of the clamping jaw and the slot bottom are connected through an arc-shaped concave surface.

[0010] The further setting of the technical scheme is that the length of the limiting wall and the clamping jaw in the axial direction L is consistent.

[0011] The further setting of the technical scheme is that the elastic jaw is also integrally formed on the rotor, and the first end of the elastic jaw in the axial direction L is connected to the slot bottom; the elastic side is an arc surface on the side of the elastic jaw facing the steel shaft. The length of the elastic jaw and the limiting jaw in the axial direction L is consistent.

[0012] The further setting of the technical scheme is that the end of the elastic side and the limiting side away from the shaft hole is provided with an inclined guide surface, and a plurality of guide surfaces are enclosed to form a necked guide entrance for the insertion of the steel shaft.

[0013] The further setting of the technical scheme is that the total number of the elastic jaw and the limiting jaw is at least three.

[0014] The further setting of the technical scheme is that the elastic side and the limiting side are provided with a holding curved surface, and the holding curved surface is connected to the guide surface in the axial direction.

[0015] Compared with the prior art, the beneficial effects of the present application are that the elastic limiting structure is arranged, the dynamic gap compensation is realized in the case of maintaining the coaxiality of the steel shaft and the rotor, the gap between the rotor and the steel shaft is eliminated in real time, the dynamic adhesion with the steel shaft is maintained, the rigid collision of the rotor with the steel shaft is avoided, and the mechanical noise of the motor is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the exploded structure of the present application.

[0017] Figure 2 It is a schematic diagram of the structure of the present application.

[0018] Figure 3 It is a radial cross-sectional view of the rotor.

[0019] Figure 4 It is an isometric cross-sectional view of the rotor.

[0020] Figure 5 A schematic view of a structure of a rotor.

[0021] Figure 6 An axial cross-sectional view of a rotor.

[0022] The figure is marked: 100, rotor; 101, shaft hole; 110, limiting claw; 120, elastic claw; 111, clamping claw; 112, limiting wall; 111.1, limiting side; 121, elastic side; 130, output tooth part; 102, groove bottom; 103, groove wall; 104, elastic groove; 105, arc-shaped concave surface; 1, magnet; 2, steel shaft; a, first connection point; b, second connection point; c, guide surface; d, holding curved surface. DETAILED DESCRIPTION

[0023] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined object, the specific embodiments, structures, features and effects according to the present application are described in detail below in combination with the drawings and preferred embodiments.

[0024] As shown in Figures 1-6 the embodiment, the present application discloses a mounting structure of a brushless motor rotor.

[0025] The mounting structure comprises, a rotor 100, which is provided with a shaft hole 101 penetrating through the center, for mounting a steel shaft 2 on the rotor 100 in the axial direction; a magnet 1, which is sleeved on the outer periphery of the rotor 100 and drives the rotor 100 to rotate synchronously around the axis L; an elastic limiting structure is arranged around the shaft hole 101 on the rotor 100; the elastic limiting structure comprises a limiting side 111.1 and an elastic side 121 arranged in the circumferential direction, which together constitute an elastic limiting channel coaxial with the shaft hole 101; the limiting side 111.1 is formed on the limiting claw 110 and limits the steel shaft 2 in the radial direction; the elastic side 121 is formed on the elastic claw 120, which can be deformed flexibly relative to the shaft hole 101, so that the elastic side 121 and the rotating shaft have a dynamic gap.

[0026] The above is the basic scheme of the present embodiment.

[0027] Specifically referring to Figure 1 and Figure 2As shown, in this embodiment, the rotor 100, the magnet 1 and the steel shaft 2 are arranged in a coaxial manner, and the central axes of the three are completely coincident. The steel shaft 2 penetrates through the entire inside of the rotor 100 along the axial direction, and is in a gap fit relationship with the shaft hole 101 of the rotor 100, ensuring that the two can realize relative rotation. The magnet 1 is arranged in a ring structure and is installed on the outer circumferential surface of the rotor 100 through a limiting structure, forming a complete magnetic pole array. When the rotor 100 starts to rotate under the action of the stator magnetic field, since the steel shaft 2 is fixedly installed and remains stationary, the rotor 100 and the steel shaft 2 will produce relative rotational motion.

[0028] During the continuous operation of the rotor 100, due to the combined action of the periodically changing electromagnetic force and the centrifugal force, the rotor 100 will produce a certain amplitude of radial swing. In order to avoid this swing from causing violent collision between the inner wall of the rotor 100 and the outer surface of the steel shaft 2, an elastic limiting structure is specially provided on the outer periphery of the steel shaft 2 in this embodiment. The elastic limiting structure forms an integrated structure with the rotor 100 main body, so it can keep synchronous rotation with the rotor 100. The purpose of the elastic limiting structure is to effectively reduce the fit gap between the steel shaft 2 and the rotor 100, and more importantly, to provide elastic buffering when the rotor 100 swings, significantly reducing the collision force and frequency between the rotor 100 and the steel shaft 2, thereby greatly reducing the mechanical noise generated during equipment operation.

[0029] In this embodiment, the elastic limiting structure includes a limiting side 111.1 directly contacting the outer surface of the steel shaft 2 and an elastic side 121 having elasticity. The limiting side 111.1 limits the radial position of the steel shaft 2 through its rigidity, which can effectively ensure that the steel shaft 2 and the rotor 100 maintain a strict concentric relationship. The elastic side 121 always maintains close abutment with the outer wall of the steel shaft 2 through the elastic deformation ability of the elastic claw 120. When the rotor 100 produces a slight radial swing during high-speed rotation, the elastic side 121 will produce a corresponding radial displacement with the movement of the steel shaft 2, and this displacement forms a dynamically variable gap between the elastic side 121 and the outer wall of the steel shaft 2. Due to the elastic recovery characteristics of the material of the elastic claw 120, the elastic side 121 can always maintain continuous contact with the outer wall of the steel shaft 2. This elastic contact and the rigid constraint of the limiting side 111.1 form a radial clamping force on the steel shaft 2. Through this ingenious double-acting mechanism, the system can eliminate any possible dynamic gap in real time, ensuring that the rotor 100 will not swing in the clamped state.

[0030] Based on the above settings, the dynamic stability of the rotor 100 during high-speed operation is significantly improved, and the vibration frequency during motor operation is effectively reduced, thereby improving the operation accuracy and service life of the entire transmission system.

[0031] Specifically, the limiting claw 110 is integrally formed on the rotor 100, and the rotor 100 has at least two connection points; The projection of the two connection points and the limiting side 111.1 on the same plane is arranged in a triangular structure.

[0032] Specifically referring to Figure 4 As shown in the embodiment, the limiting claw 110 is designed to be connected to the rotor 100 through two independent connection points. When projected in the axial plane, the two fixed connection points and any selected point on the surface of the limiting side 111.1 can form a complete triangle. This three-point surface arrangement not only ensures the connection strength of the limiting claw 110 on the rotor 100, but also ensures the stability of the limiting support of the steel shaft 2, and guarantees the coaxiality between the steel shaft 2 and the rotor 100. At the same time, the stability principle of the triangle effectively prevents the displacement or deformation of the steel shaft 2 relative to the rotor 100 during operation, thereby greatly improving the reliability and durability of the entire mechanical system.

[0033] In the embodiment, the limiting claw 110 includes a clamping jaw 111 with an arc-shaped cross-section, which extends along the axis L. The back of the clamping jaw 111 is radially formed with a limiting wall 112. The clamping jaw 111 is provided with a first connection point a, and the limiting wall 112 is provided with a second connection point b.

[0034] Preferably, in the embodiment, the radial cross-section of the limiting claw 110 is arranged in a T-shaped structure, which can effectively enhance its mechanical properties. Specifically, the first connection point a is arranged in the axial direction of the limiting claw 110, and the second connection point b is arranged in the radial direction. Through this spatial layout, a stable triangular support structure is naturally formed between the limiting claw 110 and the limiting side 111.1. This triangular structure has excellent mechanical properties, which can significantly improve the stability and carrying capacity of the entire device.

[0035] As a preferred solution, in the embodiment, the first connection point a and the second connection point b are both designed in a surface connection manner, which can effectively disperse stress and avoid local stress concentration. At the same time, the shape of the first connection point a is completely consistent with the radial cross-section of the clamping jaw 111, which greatly improves the tightness of the components, thereby further enhancing the reliability and service life of the entire mechanism.

[0036] In the embodiment, in order to protect the elastic limiting structure and avoid interference from components in the external space, an elastic groove 104 is arranged axially on the rotor 100, and the shaft hole 101 is formed in the groove bottom 102 of the elastic groove 104; the clamping jaw 111 extends axially from the groove bottom 102 of the elastic groove 104; The first connection site a on the clamping jaw 111 is connected to the groove bottom 102, and the second limiting site on the limiting wall 112 is connected to the groove wall 103 of the elastic groove 104.

[0037] Preferably, the elastic limiting structure is completely arranged and accommodated in the internal space of the elastic groove 104, and the overall structure does not exceed the boundary range of the elastic groove 104. In the embodiment, the elastic groove 104 is formed on the first side end face of the rotor 100, and an opening structure is formed on the side end face to facilitate assembly, and an output tooth portion 130 for power transmission is formed on the second side end face of the rotor 100. The elastic limiting structure is specifically formed in the bottom region of the elastic groove 104, and the main part extends and is arranged in the opening direction from the groove bottom 102 position, which ensures the limiting function and ensures the compactness of the structure.

[0038] In order to ensure the connection strength and reliability of the limiting jaw 110 in actual work, in the embodiment, the limiting wall 112 is connected to the groove wall 103 of the elastic groove 104 in a radial direction, that is, the limiting wall 112 is stably connected to the rotor 100 body in the entire length extension direction, and the design of full-length connection significantly improves the integrity and carrying capacity of the structure.

[0039] Preferably, in the embodiment, the outer wall of the clamping jaw 111 and the groove bottom 102 are connected through the arc-shaped concave surface 105.

[0040] Specifically referring to Figure 3 The cross section of the clamping jaw 111 adopts an arc-shaped structure, and specifically, the outer wall is a circular arc-shaped curved surface that protrudes outward. The arc-shaped outer wall is connected to the groove bottom 102 through the transition area that is recessed inward. Based on the arrangement: the protruding arc-shaped outer wall and the recessed transition curved surface form a continuous and smooth stress transmission path, which can effectively disperse external loads; at the same time, the structure significantly enhances the overall support strength and anti-deformation ability of the clamping jaw 111, and when the clamping jaw 111 bears external force, the optimized design can effectively inhibit the generation of bending deformation, thereby ensuring that the clamping jaw 111 always maintains stable limiting performance and avoids functional failure due to deformation.

[0041] Preferably, in the embodiment, the limiting wall 112 and the clamping jaw 111 have the same length in the axial direction L.

[0042] Based on the above settings, in the embodiment, the design of the limiting wall 112 can provide stable and reliable support for the arbitrary position of the clamping jaw 111 in the length direction, and this support mechanism runs through the entire working stroke of the clamping jaw 111. That is, the limiting wall 112 can form a uniform support force distribution on the entire limiting side 111.1 of the clamping jaw 111, thereby effectively ensuring the concentricity accuracy between the limiting side 111.1 and the shaft hole 101. This support mechanism not only can prevent the clamping jaw 111 from producing deviation or deformation during operation, but also can ensure that the clamping jaw 111 can obtain consistent support effect at each position in the length direction, thereby improving the stability and accuracy of the entire clamping system.

[0043] Preferably, in the embodiment, the limiting wall 112 is connected to the middle of the outer wall of the clamping jaw 111.

[0044] In the embodiment, the specific setting mode of the elastic jaw 120 is that the elastic jaw 120 is also integrally formed on the rotor 100, and the first end of the elastic jaw 120 in the axial L direction is connected with the groove bottom 102; the elastic side 121 is an arc surface on the side of the elastic jaw 120 facing the steel shaft 2. The length of the elastic jaw 120 and the limiting jaw 110 in the axial L direction is consistent.

[0045] Preferably, in the embodiment, the elastic jaw 120 and the clamping jaw 111 are consistent in the overall structural design. The elastic side 121 formed on the elastic jaw 120 and the limiting side 111.1 formed on the limiting jaw 110 can be spliced to form a complete clamping space.

[0046] Based on the above settings, the elastic jaw 120 and the limiting jaw 110 can produce uniformly distributed clamping force when clamping the steel shaft 2, thereby ensuring that the force size and direction of the steel shaft 2 at each contact point remain consistent. This uniform stress state effectively avoids the problems of position deviation or shape deformation of the steel shaft 2 caused by uneven local stress, and significantly improves the stability and reliability of the clamping process.

[0047] In the embodiment, the outer wall of the elastic jaw 120 and the groove bottom 102 are also connected through the arc-shaped concave surface 105.

[0048] In the embodiment, in order to facilitate the smooth installation of the steel shaft 2, the end of the elastic side 121 and the limiting side 111.1 away from the shaft hole 101 is provided with an inclined guide surface c, and a plurality of guide surfaces c are surrounded to form a neck-shaped guide inlet for the steel shaft 2 to insert.

[0049] Reference Figure 5As shown, the guide surface c is arranged at the opening end of the elastic groove 104, and has a gradually tapered conical shape along the insertion direction of the steel shaft 2. This structure can provide effective guidance for the installation process of the steel shaft 2. Through the tapered conical structure of the guide surface c, it can ensure that the steel shaft 2 always maintains the correct movement trajectory during insertion, and finally accurately positions the coaxial position of the elastic groove 104. This guide structure not only simplifies the installation operation, but also improves the accuracy and reliability of the assembly, so that the steel shaft 2 can be smoothly inserted into the predetermined position without deviation or jamming phenomenon.

[0050] In order to ensure the contact between the limiting side 111.1 and the elastic side 121 and the steel shaft 2, in this embodiment, the elastic side 121 and the limiting side 111.1 are provided with a clamping curved surface d which is connected to the guide surface c in the axial direction.

[0051] Preferably, the minimum inner diameter of the clamping curved surface d is smaller than the diameter of the steel shaft 2.

[0052] Specifically referring to Figure 6 As shown, the tapered end of the guide surface c is connected to the clamping curved surface d. The shape of the clamping curved surface d on the radial section is set as a continuous arc line protruding towards the center, and this arc line shape can form a progressive clamping effect. Specifically, at least one specific clamping point is provided on the clamping curved surface d, and the inner diameter of the clamping space formed at the clamping point is smaller than the actual diameter of the steel shaft 2. When the steel shaft 2 gradually inserts along the guide surface c, as the shaft body advances, once it reaches the predetermined position of the clamping space, the outer surface of the steel shaft 2 will generate a radial outward extrusion force on the clamping curved surface d. This interaction force will make the clamping curved surface d elastically deform and expand outward, thereby ensuring that the clamping point can continuously and stably contact the outer surface of the steel shaft 2 under the premise of maintaining a certain contact pressure, forming a reliable clamping effect.

[0053] Preferably, in this embodiment, the total number of the elastic claws 120 and the limiting claws 110 is at least three.

[0054] In this embodiment, the limiting claws 110 and the elastic claws 120 are each provided with at least one. The three claws form a stable three-point contact system on the outer periphery of the steel shaft 2. When these claws contact the outer circumferential surface of the steel shaft 2, they form reliable mechanical contact points at three different positions of the steel shaft 2. By using the inherent stability principle of triangular geometry, through the geometric property that three points determine a plane, the entire limiting and elastic structure can generate uniformly distributed radial clamping force on the steel shaft 2. This multi-claw cooperative design not only improves the reliability of clamping, but also ensures that the steel shaft 2 can obtain balanced restraining force in all radial directions, thereby realizing accurate control and stable fixation of the radial position of the steel shaft 2.

[0055] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been described above with reference to preferred embodiments, the present application is not intended to be limited to the above-described embodiments, and any person skilled in the art, without departing from the technical scope of the present application, can make some changes or modifications to the above-described technical content to obtain equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above-described embodiments according to the technical essence of the present application, without departing from the technical scope of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. A mounting structure of a brushless motor rotor, comprising, a rotor (100) provided with a through shaft hole (101) in the center for mounting a steel shaft (2) to the rotor (100) in the axial direction; a magnet (1) sleeved on the outer periphery of the rotor (100) and driving the rotor (100) to rotate synchronously around the axis L; characterized in that an elastic limiting structure is arranged around the shaft hole (101) on the rotor (100); the elastic limiting structure comprises a limiting side (111.1) and an elastic side (121) arranged in the circumferential direction, which together form an elastic limiting channel coaxial with the shaft hole (101); the limiting side (111.1) is formed on a limiting claw (110) and limits the steel shaft (2) in the radial direction; the elastic side (121) is formed on an elastic claw (120), which can be deformed to make the elastic side (121) and the steel shaft (2) have a dynamic gap.

2. The mounting structure of a brushless motor rotor according to claim 1, characterized by: the limiting claw (110) is integrally formed on the rotor (100), and the rotor (100) has at least two engagement points; the projections of the two engagement points and the limiting side (111.1) on the same plane are arranged in a triangular structure.

3. The mounting structure of a brushless motor rotor according to claim 2, characterized by: the limiting claw (110) comprises a clamping claw (111) with an arc-shaped cross section, which extends along the axis (L); the back of the clamping claw (111) is radially formed with a limiting wall (112); the clamping claw (111) is provided with a first engagement point (a), and the limiting wall (112) is provided with a second engagement point (b).

4. The mounting structure of a brushless motor rotor according to claim 3, characterized by: an elastic groove (104) is arranged axially on the rotor (100), and the shaft hole (101) is formed on the groove bottom (102) of the elastic groove (104); the clamping claw (111) extends axially from the groove bottom (102) of the elastic groove (104); the first engagement point (a) on the clamping claw (111) engages with the groove bottom (102), and the second engagement point (b) on the limiting wall (112) engages with the groove wall (103) of the elastic groove (104).

5. The mounting structure of a brushless motor rotor according to claim 4, characterized by: the outer wall of the clamping claw (111) and the groove bottom (102) are connected by an arc-shaped concave surface (105).

6. The mounting structure of a brushless motor rotor according to claim 3, characterized by: the length of the limiting wall (112) and the clamping claw (111) in the direction of the axis L is consistent.

7. The mounting structure of a brushless motor rotor according to claim 4, characterized by: the elastic claw (120) is also integrally formed on the rotor (100), and the first end of the elastic claw (120) in the direction of the axis (L) engages with the groove bottom (102); the elastic side (121) is an arc surface on the side of the elastic claw (120) facing the steel shaft (2); the length of the elastic claw (120) and the limiting claw (110) in the direction of the axis (L) is consistent.

8. The mounting structure of a brushless motor rotor according to claim 1 or 7, characterized by: The elastic side (121) and the limiting side (111.1) are provided with inclined guide surfaces (c) at the end away from the shaft hole (101), and a plurality of guide surfaces (c) are enclosed to form a necked guide entrance for the steel shaft (2) to be inserted.

9. The mounting structure of a brushless motor rotor according to claim 1, characterized by: The total number of the elastic claws (120) and the limiting claws (110) is at least three.

10. The mounting structure of a brushless motor rotor according to claim 8, characterized by: The elastic side (121) and the limiting side (111.1) are provided with a clamping curved surface (d) which is connected to the guide surface (c) in the axial direction.

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