Brushless motor rotor with noise reduction function

Abstract

The utility model provides a brushless motor rotor with noise reduction function, including rotor body and magnetic ring, the rotor body is by plastics material integral injection moulding, the upper end of rotor body is provided with output gear coaxially, the inside of rotor body is provided with pin hole coaxially, the magnetic ring is integral injection moulded on the outer wall of rotor body and is provided with rotor body coaxially, the brushless motor rotor still includes bearing, the inside of rotor body lower extreme is provided with recessed cavity coaxially, and bearing is inlayed in recessed cavity and is limited with recessed cavity axial, the utility model discloses after applying to the brushless motor, when the high frequency operation of brushless motor, can effectively eliminate the noise of actuating mechanism.

Description

Technical Field

[0001] This utility model relates to the field of brushless motor technology, and more specifically, to a brushless motor rotor with noise reduction function. Background Technology

[0002] With the rapid development of my country's automotive industry, automobiles are increasingly moving towards intelligence, meaning that in-vehicle intelligent and automated functions are becoming more mature. Consequently, many components in the vehicle require intelligent control using actuators, such as the electric adjustment of the air vents of the car's air conditioning system. Among these actuators, the brushless motor is the core component, used to drive the transmission components within the actuator. In existing brushless motor structures, the rotor is entirely injection-molded from plastic material. During the rotor injection molding process, the diameter of the pin hole located in the middle of the rotor, which mates with the pin on the stator, is generally small. This results in a certain deviation in the coaxiality between the pin hole and the rotor, and the pin hole may also deform. Consequently, when the rotor rotates relative to the stator, it causes the rotor to wobble and vibrate. This significantly affects the noise performance of the actuator when the brushless motor operates at high frequencies. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a brushless motor rotor with noise reduction function, which can effectively eliminate the noise of the actuator when the brushless motor is running at high frequency after being applied to the brushless motor.

[0004] This utility model provides a brushless motor rotor with noise reduction function, including a rotor body and a magnetic ring; the rotor body is integrally injection molded from plastic material, and an output gear is coaxially arranged at the upper end of the rotor body, and a pin hole is coaxially arranged inside the rotor body; the magnetic ring is integrally injection molded on the outer peripheral wall of the rotor body and is coaxially arranged with the rotor body; the brushless motor rotor also includes a bearing, and a cavity is coaxially arranged on the inner side of the lower end of the rotor body, and the bearing is embedded in the cavity and axially limited by the cavity.

[0005] This invention, by providing a recessed cavity for mounting a bearing on the inner side of the lower end of the rotor body, ensures that the cavity is less prone to deformation compared to the pin hole due to the larger inner diameter of the cavity. Furthermore, by embedding a bearing within the cavity and allowing the rotor body to rotate in conjunction with a pin on the stator, the coaxiality of the rotor body and the pin is further guaranteed. This improves the smoothness of rotor rotation relative to the stator and further prevents rotor body wobbling and vibration. Consequently, when this brushless motor rotor is applied to a brushless motor, it effectively eliminates noise from the actuator during high-frequency operation of the brushless motor.

[0006] In one possible implementation, the inner diameter of the bearing is the same as the diameter of the pin hole. With this structure, after the pin on the stator of the brushless motor is inserted into the pin hole, the outer peripheral wall of the pin can fit against both the inner wall of the bearing and the wall of the pin hole. This further ensures the coaxiality of the rotor body and the pin, that is, when the rotor body rotates relative to the stator, it can improve the smoothness of the rotor body rotation and further avoid the rotor body from wobble or shaking.

[0007] In one possible implementation, the upper end of the bearing abuts against the inner top of the cavity, and an annular rib is provided on the inner wall of the lower part of the cavity. The outer edge of the lower end of the bearing abuts against the annular rib. With this structure, since the upper end of the bearing abuts against the inner top of the cavity and the outer edge of the lower end of the bearing abuts against the annular rib, the bearing can be reliably assembled in the cavity and axially limited with respect to the rotor body.

[0008] In one possible implementation, an annular rounded corner surface is provided on the inner wall of the lower end of the cavity. The annular rounded corner surface is used to cooperate with the outer peripheral wall of the bearing to guide it so that the bearing can be embedded in the cavity. By providing an annular rounded corner surface on the inner peripheral wall of the lower end of the cavity, the annular rounded corner surface can cooperate with the outer peripheral wall of the bearing to guide it during the process of embedding the bearing into the cavity, which can facilitate the assembly of the bearing and the rotor body.

[0009] In one possible implementation, the bearing is an oil-impregnated bearing; by using an oil-impregnated bearing, it has the advantage of good bearing lubrication, thereby further reducing the noise of the rotor body during rotation relative to the stator, and improving the smoothness and reliability of the rotor body during rotation.

[0010] In one possible implementation, an annular arc surface is formed on the outer peripheral wall at the connection between the output gear and the rotor body. By adopting this structure, the connection strength between the output gear and the rotor body can be further improved under the action of the annular arc surface, which can effectively prevent the output gear from breaking relative to the rotor body.

[0011] In one possible implementation, an annular groove is coaxially provided on the outer peripheral wall of the rotor body, and the magnetic ring is embedded in the annular groove and circumferentially limited with the rotor body. The two ends of the magnetic ring in the axial direction abut against the two ends of the annular groove in the axial direction, respectively. With this structure, the magnetic ring can be reliably embedded in the outer peripheral wall of the rotor body, and the magnetic ring can reliably achieve the purpose of circumferential and axial limitation with the rotor body.

[0012] In one possible implementation, the outer peripheral wall of the magnetic ring protrudes from the outer peripheral wall of the rotor body in the radial direction; by adopting this structure, the magnetic ring can more reliably conduct magnetism with the coils in the stator, thereby improving the reliability of the brushless motor rotor rotation. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is a cross-sectional structural diagram of the present invention. Detailed Implementation

[0015] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0016] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0017] In the embodiments of this application, unless otherwise expressly 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.

[0018] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] See Figure 1-2As shown in the figure, this application discloses a brushless motor rotor with noise reduction function, including a rotor body 1 and a magnetic ring 2; the rotor body 1 is integrally injection molded from plastic material, and an output gear 11 is coaxially arranged at the upper end of the rotor body 1, and a pin hole 12 is coaxially arranged inside the rotor body 1; the magnetic ring 2 is integrally injection molded on the outer peripheral wall of the rotor body 1 and is coaxially arranged with the rotor body 1; the brushless motor rotor also includes a bearing 3, and a cavity 13 is coaxially arranged on the inner side of the lower end of the rotor body 1, and the bearing 3 is embedded in the cavity 13 and is axially limited by the cavity 13; the rotor body can be made of POM material, nylon material or other engineering plastic material.

[0020] The inner diameter of bearing 3 is the same as the diameter of pin hole 12. With this structure, after the pin on the stator of the brushless motor is inserted into the pin hole, the outer peripheral wall of the pin can fit with the inner hole wall of the bearing and the hole wall of the pin hole. This can further ensure the coaxiality of the rotor body and the pin, that is, when the rotor body rotates relative to the stator, it can improve the stability of the rotor body rotation and further avoid the rotor body from wobbling or shaking.

[0021] The upper end of the bearing 3 abuts against the inner top of the cavity 13. An annular rib 14 is provided on the inner wall of the lower part of the cavity 13. The outer edge of the lower end of the bearing 3 abuts against the annular rib 14. With this structure, since the upper end of the bearing abuts against the inner top of the cavity and the outer edge of the lower end of the bearing abuts against the annular rib, the bearing can be reliably assembled in the cavity and axially limited with the rotor body.

[0022] An annular rounded corner surface 131 is provided on the inner wall of the lower end of the cavity 13. The annular rounded corner surface 131 is used to cooperate with the outer peripheral wall of the bearing 3 for guidance so that the bearing 3 can be embedded in the cavity 13. By providing an annular rounded corner surface on the inner peripheral wall of the lower end of the cavity, the annular rounded corner surface can cooperate with the outer peripheral wall of the bearing for guidance during the process of the bearing being embedded in the cavity, which can facilitate the assembly of the bearing and the rotor body.

[0023] Bearing 3 is an oil-impregnated bearing; by using an oil-impregnated bearing, it has the advantage of good bearing lubrication, which can further reduce the noise of the rotor body during rotation when the rotor body rotates relative to the stator, and improve the smoothness and reliability of the rotor body during rotation.

[0024] A ring-shaped arc surface 111 is formed on the outer peripheral wall at the connection between the output gear 11 and the rotor body 1. By adopting this structure, the connection strength between the output gear and the rotor body can be further improved under the action of the ring-shaped arc surface, which can effectively prevent the output gear from breaking relative to the rotor body.

[0025] An annular groove 15 is coaxially provided on the outer peripheral wall of the rotor body 1. The magnetic ring 2 is embedded in the annular groove 15 and is circumferentially limited with the rotor body 1. The two ends of the magnetic ring 2 in the axial direction abut against the two ends of the annular groove 15 in the axial direction, respectively. With this structure, the magnetic ring can be reliably embedded on the outer peripheral wall of the rotor body, and the magnetic ring can reliably achieve the purpose of circumferential and axial limitation with the rotor body.

[0026] The outer peripheral wall of the magnetic ring 2 protrudes from the outer peripheral wall of the rotor body 1 in the radial direction. By adopting this structure, the magnetic ring can more reliably conduct magnetism with the coils in the stator, thereby improving the reliability of the brushless motor rotor rotation.

[0027] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A brushless motor rotor with noise reduction function, comprising a rotor body (1) and a magnetic ring (2); the rotor body (1) is integrally injection molded from plastic material, an output gear (11) is coaxially disposed at the upper end of the rotor body (1), and a pin hole (12) is coaxially disposed inside the rotor body (1); the magnetic ring (2) is integrally injection molded on the outer peripheral wall of the rotor body (1) and coaxially disposed with the rotor body (1); characterized in that: The brushless motor rotor also includes a bearing (3). A cavity (13) is coaxially provided on the inner side of the lower end of the rotor body (1). The bearing (3) is embedded in the cavity (13) and is axially limited by the cavity (13).

2. The brushless motor rotor with noise reduction function according to claim 1, characterized in that: The inner diameter of the bearing (3) is the same as the diameter of the pin hole (12).

3. The brushless motor rotor with noise reduction function according to claim 1 or 2, characterized in that: The upper end of the bearing (3) abuts against the inner top of the cavity (13), and an annular rib (14) is provided on the inner wall of the lower part of the cavity (13). The outer edge of the lower end of the bearing (3) abuts against the annular rib (14).

4. The brushless motor rotor with noise reduction function according to claim 3, characterized in that: An annular rounded corner surface (131) is provided on the inner wall of the lower end of the cavity (13). The annular rounded corner surface (131) is used to cooperate with the outer peripheral wall of the bearing (3) for guidance so that the bearing (3) can be embedded in the cavity (13).

5. The brushless motor rotor with noise reduction function according to claim 1, 2, or 4, characterized in that: The bearing (3) is an oil-impregnated bearing.

6. The brushless motor rotor with noise reduction function according to claim 1, 2, or 4, characterized in that: An annular arc surface (111) is formed on the outer peripheral wall at the connection between the output gear (11) and the rotor body (1).

7. The brushless motor rotor with noise reduction function according to claim 1, 2, or 4, characterized in that: An annular groove (15) is coaxially provided on the outer peripheral wall of the rotor body (1). The magnetic ring (2) is embedded in the annular groove (15) and is circumferentially limited by the rotor body (1). The two ends of the magnetic ring (2) in the axial direction abut against the two ends of the annular groove (15) in the axial direction, respectively.

8. The brushless motor rotor with noise reduction function according to claim 7, characterized in that: The outer peripheral wall of the magnetic ring (2) protrudes from the outer peripheral wall of the rotor body (1) in the radial direction.

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