A rotor structure for a brushless motor

Abstract

The utility model discloses a rotor structure for brushless motor, including rotor main part and the axle connecting seat of setting in the inside of rotor main part, be equipped with axle hole in the axle connecting seat, be equipped with the axle body in the axle hole, one side of axle connecting seat is equipped with a plurality of clamping block around axle hole setting, the elastic setting of clamping block is in radial, and the inner wall of clamping block defines the clamping space of intercommunication axle hole, the inner wall of clamping space is provided with clamping protruding portion, and clamping block is held tightly in the axle body in the clamping space through clamping protruding portion.

Description

Technical Field

[0001] This utility model relates to the field of brushless motor technology, and specifically to a rotor structure for a brushless motor. Background Technology

[0002] Currently, a brushless motor rotor typically includes a central shaft hole, a base shaft passing through the central shaft hole, and a rotor body. The rotor body is equipped with magnets. In the mating state, the base shaft and the central shaft hole are fitted with a clearance fit, allowing the rotor body to rotate relative to the base shaft. However, due to the clearance fit between the base shaft and the central shaft hole, if the clearance is too small, it will affect the smoothness of rotation; if the clearance is too large, there will be collision noise between the outer wall of the base shaft and the inner wall of the central shaft hole during rotation, affecting normal use. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a rotor structure for brushless motors.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a rotor structure for a brushless motor, comprising a rotor body and a shaft connecting seat disposed inside the rotor body, wherein the shaft connecting seat is provided with a shaft hole, a shaft body is inserted through the shaft hole, a plurality of clamping blocks are provided on one side of the shaft connecting seat surrounding the shaft hole, the clamping blocks are elastically disposed in the radial direction, and the inner wall of the clamping blocks defines a clamping space communicating with the shaft hole, the inner wall of the clamping space is provided with a clamping protrusion, and the clamping blocks are held tightly to the shaft body in the clamping space by the clamping protrusion.

[0005] Furthermore, the maximum inner diameter defined by the clamping protrusion is smaller than the outer diameter of the shaft, so that the clamping block can undergo radial elastic deformation to adaptively grip the shaft.

[0006] Furthermore, the clamping block is also provided with an auxiliary guide surface, which is connected between the clamping protrusion and the shaft connecting seat. The minimum inner diameter defined by the auxiliary guide surface is greater than the maximum inner diameter defined by the clamping protrusion.

[0007] Furthermore, the clamping block and the shaft connecting seat are axially opposite each other, and the inner diameter of the auxiliary guide surface expands toward the shaft connecting seat.

[0008] Furthermore, the auxiliary guide surface is configured to tend to be parallel to the outer surface of the shaft after the shaft is inserted, or at least a portion of the auxiliary guide surface is in contact with the outer wall of the shaft.

[0009] Furthermore, the wall thickness of the clamping block gradually decreases from the clamping protrusion toward the auxiliary guide surface, and the wall thickness of the clamping block on the auxiliary guide surface gradually decreases toward the shaft connecting seat.

[0010] Furthermore, the inner wall of the clamping block is provided with a clamping curved surface, which matches the outer wall of the shaft, and the clamping curved surface gradually increases from the clamping protrusion toward the shaft connecting seat.

[0011] Furthermore, the axial sides of the clamping protrusion are arranged in an arc shape.

[0012] Furthermore, the shaft connecting seat is provided with teeth, and the shaft connecting seat extends to the end of the rotor body. The fixed end of the clamping block is provided on the shaft connecting seat, and the free end of the clamping block is provided inside the rotor body.

[0013] Furthermore, a base is provided on the fixed end of the clamping block.

[0014] Compared with the prior art, this utility model has the following advantages and beneficial effects: Through multiple circumferentially arranged elastic clamping blocks and their inner wall clamping protrusions, the insertion space of the shaft is defined between the multiple clamping protrusions, and an elastic adaptive clamping fit is formed with the shaft, which compensates for the small radial offset when the rotor rotates in real time, thereby maintaining an optimal working clearance and improving the quiet, smooth and efficient operation of the brushless motor. In addition, the clamping blocks are integrally formed with the rotor body, simplifying the assembly process. At the same time, the elastic clamping blocks can adapt to shafts with different outer diameters within a certain range, compensating for the machining errors of the parts. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the rotor body and shaft of the present invention; Figure 2 This is a front view of the rotor body of the present invention; Figure 3 This is a partial schematic diagram of the clamping block on the rotor body of the present invention; Figure 4 This is a cross-sectional view of the rotor body of the present invention; Figure 5 This is a schematic diagram of the clamping block of the present invention; Figure 6 This is a cross-sectional schematic diagram of the clamping block of the present invention; Figure 7 This is a schematic diagram of the overall structure of the present invention; In the figure: 1. Rotor body; 1.1 Support part; 2. Shaft connecting seat; 2.1 Gear part; 3. Shaft hole; 4. Shaft body; 5. Clamping block; 5.1 Clamping protrusion; 5.2 Auxiliary guide surface; 5.3 Clamping curved surface; 5.4 Base; 6. Clamping space; 7. Magnet; Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] It should be understood that although the terms upper, middle, lower, top, one end, etc., appear in this document to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish the elements from each other for ease of understanding, and are not used to define any directional or sequential restrictions.

[0018] like Figure 1-6 As shown, a rotor structure for a brushless motor includes a rotor body 1 and a shaft connecting seat 2 disposed inside the rotor body 1. The shaft connecting seat 2 has a shaft hole 3, and a shaft 4 passes through the shaft hole 3. A plurality of clamping blocks 5 are provided on one side of the shaft connecting seat 2, which are arranged around the shaft hole 3. The clamping blocks 5 are elastically arranged in the radial direction, and the inner wall of the clamping blocks 5 defines a clamping space 6 that communicates with the shaft hole 3. The inner wall of the clamping space 6 is provided with clamping protrusions 5.1. The clamping blocks 5 are held tightly to the shaft 4 in the clamping space 6 by the clamping protrusions 5.1.

[0019] When the shaft 4 is inserted, the clamping block 5 adaptively grips the shaft 4 with different outer diameters and can automatically compensate for the machining error, thermal deformation and wear caused by long-term operation. It should be noted that the elastic clamping block 5 is integrally formed with the rotor body 1 or the shaft connecting seat 2, without the need for additional fasteners or complex processes.

[0020] In this embodiment, the rotor body 1 is an annular hollow structure, and a magnet 7 is provided on the outer wall of the rotor body 1. The magnet 7 is preferably a regular circular ring shape to control the rotor's center of gravity to be on the rotation axis.

[0021] A shaft end wall is provided at one end of the rotor body 1. The shaft connecting seat 2 is specifically provided on the shaft end wall along the rotation axis and extends away from the rotor body 1. The root of the clamping block 5 is provided on the side of the shaft end wall away from the shaft connecting seat 2 and extends axially in the hollow part of the rotor body 1. Thus, the clamping space 6 defined by the plurality of clamping blocks 5 in the axial direction is connected to the shaft hole 3 on the shaft connecting seat 2.

[0022] Preferably, the shaft connecting seat 2 forms the transmission part of the rotor.

[0023] Further reference Figure 1As a further embodiment of clamping the shaft 4 with the clamping block 5, the maximum inner diameter defined by the plurality of clamping protrusions 5.1 is smaller than the outer diameter of the shaft 4, so that the clamping block 5 generates radial elastic deformation and adaptively clamps the shaft 4. Thus, during the insertion of the shaft 4, the clamping block 5 expands at its root on the shaft end wall. At this time, the clamping protrusion 5.1, as the part with the greatest deformation, applies a radial clamping force to the shaft 4 toward the axis, that is, it generates elastic deformation. Through the stable radial clamping force of the clamping block 5, the dynamic gap adjustment between the shaft 4 and the rotor body 1 is realized, which not only effectively eliminates radial movement and the resulting collision noise, but also ensures smooth rotation because it is elastic support rather than rigid compression.

[0024] like Figure 4 and Figure 6 As shown, the clamping block 5 is also provided with an auxiliary guide surface 5.2. The auxiliary guide surface 5.2 is connected between the clamping protrusion 5.1 and the shaft connecting seat 2. Specifically, the auxiliary guide surface 5.2 is connected to the shaft end wall of the rotor body 1. The minimum inner diameter defined by the auxiliary guide surface is greater than the maximum inner diameter defined by the clamping protrusion 5.1. In other words, the auxiliary guide surface defines a deformation space between the clamping protrusion 5.1 and the shaft end wall to optimize the fit between the clamping block 5 and the shaft 4. For shafts 4 with different outer diameters, after the shaft 4 is placed into the clamping space 6, it can contact and abut with the deformed and expanded auxiliary guide surface 5.2, thereby increasing the contact area and dispersing stress, providing a clamping area, making the force application more gentle and uniform, and improving the stability and durability of the structure.

[0025] Specifically, the clamping block 5 and the shaft connecting seat 2 are axially opposite each other. The inner diameter of the auxiliary guide surface 5.2 expands toward the shaft connecting seat 2, so that the space defined by the auxiliary guide surface 5.2 has a flared shape that expands toward the shaft end wall and the shaft connecting seat 2, thereby reducing the assembly accuracy of the shaft body 4. If the shaft body 4 is inserted at an angle, the auxiliary guide surface 5.2 provides guidance to ensure that the shaft body 4 is placed in the shaft hole 3. More importantly, the auxiliary guide surface 5.2 can match shaft bodies 4 with different outer diameters in the axial clamping space 6. During the insertion of the shaft body 4, the section on the auxiliary guide surface 5.2 tends to be parallel to the outer wall of the shaft body 4.

[0026] Specifically, the auxiliary guide surface 5.2 is configured to tend to be parallel to the outer surface of the shaft 4 after the shaft 4 is inserted, or at least a portion of the auxiliary guide surface 5.2 is in contact with the outer wall of the shaft 4. When dealing with a shaft 4 with a large outer diameter, the auxiliary guide surface 5.2 provides contact and auxiliary clamping with the shaft 4, which can evenly distribute the clamping force to a larger area, significantly reduce local contact stress, avoid plastic deformation or wear of the clamping block 5 caused by stress concentration, and extend its service life.

[0027] Further reference Figure 5 and Figure 6 As shown, the wall thickness of the clamping block 5 gradually decreases from the clamping protrusion 5.1 toward the auxiliary guide surface 5.2, and the wall thickness of the clamping block 5 on the auxiliary guide surface 5.2 gradually decreases toward the shaft connecting seat 2. The wall thickness is largest in the area of ​​the clamping protrusion 5.1, ensuring that the clamping protrusion 5.1 provides sufficient clamping support. The gradually decreasing wall thickness of the auxiliary guide surface 5.2 provides elastic deformation capability for the entire clamping block 5, which can flexibly and adaptively adjust while clamping the shaft 4.

[0028] Specifically, the inner wall of the clamping block 5 is provided with a clamping curved surface 5.3, which matches the outer wall of the shaft 4. The clamping curved surface 5.3 gradually increases from the clamping protrusion 5.1 toward the shaft connecting seat 2. The purpose of this arrangement is to optimize stress distribution. When dealing with the large outer diameter shaft 4, the auxiliary guide surface 5.2 provides a larger clamping curved surface 5.3 to ensure the stability of the rotor body 1 rotating on the shaft 4.

[0029] like Figure 6 As shown, specifically, the axial sides of the clamping protrusion 5.1 are arranged in an arc shape. This arrangement forms an open opening on the free end side of the clamping block 5 to facilitate the insertion of the shaft 4. The contact state between the clamping protrusion 5.1 and the shaft 4 is optimized to avoid excessive wear between the clamping protrusion 5.1 and the shaft 4. From the perspective of clamping force, the expanded clamping block 5 and the shaft 4 are in arc contact, which effectively increases the clamping force to ensure the radial adjustment between the rotor body 1 and the shaft 4.

[0030] from Figure 7 As can be seen, the shaft connecting seat 2 is provided with teeth 2.1, and the shaft connecting seat 2 extends to the end of the rotor body 1. The fixed end of the clamping block 5 is set on the shaft connecting seat 2, and the free end of the clamping block 5 is set inside the rotor body 1. Integrating the transmission teeth 2.1 with the shaft connecting seat 2 makes the structure more compact. At the same time, by embedding the free end of the clamping block 5 inside the rotor body 1 and setting the fixed end on the solid shaft connecting seat 2, the stability of the force base is ensured, the overall stability and balance of the rotor under high-speed operation are improved, and the elastic clamping block 5 is also protected.

[0031] It is worth mentioning that this method makes the part of the clamping block 5 that dynamically adjusts the rotor body 1 closer to the overall center of gravity, which is beneficial to improving rotational stability.

[0032] Specifically, a base 5.4 is provided on the fixed end of the clamping block 5. The base 5.4 is preferably arc-shaped and connected to the shaft end wall to increase the structural strength and rigidity of the fixed end of the clamping block 5, effectively resist the alternating stress caused by repeated elastic deformation, and greatly improve the bending fatigue resistance of the clamping block 5 and the durability of the entire mechanism.

[0033] As a further embodiment of the cooperation between the magnet 7 and the rotor body 1, the rotor body 1 has support portions 1.1 on both sides of the shaft end. The magnet 7 body is sleeved on the rotor body 1 and abuts against the support portions 1.1. There is a concave-convex fit structure between the magnet 7 body and the support portion 1.1. The support portion 1.1 and the concave-convex fit structure ensure that the magnet 7 is fixed in the circumference and axial direction on the rotor body 1, and prevent the magnet 7 from loosening or shifting under high-speed rotation.

[0034] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A rotor structure for a brushless motor, characterized in that, The device includes a rotor body (1) and a shaft connecting seat (2) disposed inside the rotor body (1). The shaft connecting seat (2) has a shaft hole (3) and a shaft body (4) passes through the shaft hole (3). A plurality of clamping blocks (5) are provided on one side of the shaft connecting seat (2) and arranged around the shaft hole (3). The clamping blocks (5) are elastically arranged in the radial direction, and the inner wall of the clamping blocks (5) defines a clamping space (6) that communicates with the shaft hole (3). The inner wall of the clamping space (6) is provided with a clamping protrusion (5.1). The clamping blocks (5) are held tightly to the shaft body (4) in the clamping space (6) by the clamping protrusion (5.1).

2. The rotor structure for a brushless motor according to claim 1, characterized in that: The maximum inner diameter defined by the clamping protrusion (5.1) is smaller than the outer diameter of the shaft (4), so that the clamping block (5) undergoes radial elastic deformation to adaptively grip the shaft (4).

3. The rotor structure for a brushless motor according to claim 1, characterized in that: The clamping block (5) is also provided with an auxiliary guide surface (5.2), which is connected between the clamping protrusion (5.1) and the shaft connecting seat (2). The minimum inner diameter defined by the auxiliary guide surface is greater than the maximum inner diameter defined by the clamping protrusion (5.1).

4. The rotor structure for a brushless motor according to claim 3, characterized in that: The clamping block (5) and the shaft connecting seat (2) are arranged opposite each other in the axial direction, and the inner diameter of the auxiliary guide surface (5.2) expands toward the shaft connecting seat (2).

5. A rotor structure for a brushless motor according to claim 3, characterized in that: The auxiliary guide surface (5.2) is configured to tend to be parallel to the outer surface of the shaft (4) after the shaft (4) is inserted, or at least a portion of the auxiliary guide surface (5.2) is in contact with the outer wall of the shaft (4).

6. A rotor structure for a brushless motor according to claim 3, characterized in that: The wall thickness of the clamping block (5) gradually decreases from the clamping protrusion (5.1) toward the auxiliary guide surface (5.2), and the wall thickness of the clamping block (5) on the auxiliary guide surface (5.2) gradually decreases toward the shaft connecting seat (2).

7. The rotor structure for a brushless motor according to claim 1, characterized in that: The inner wall of the clamping block (5) is provided with a clamping curved surface (5.3), which matches the outer wall of the shaft (4), and the clamping curved surface (5.3) gradually increases from the clamping protrusion (5.1) toward the shaft connecting seat (2).

8. The rotor structure for a brushless motor according to claim 1, characterized in that: The clamping protrusion (5.1) is arranged with arc surfaces on both sides along its axial direction.

9. A rotor structure for a brushless motor according to claim 1, characterized in that: The shaft connecting seat (2) is provided with teeth (2.1), and the shaft connecting seat (2) extends to the end of the rotor body (1). The fixed end of the clamping block (5) is provided on the shaft connecting seat (2), and the free end of the clamping block (5) is provided inside the rotor body (1).

10. A rotor structure for a brushless motor according to claim 1, characterized in that: The clamping block (5) has a base (5.4) on its fixed end.

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