CN220874338U - Noise reduction rotor assembly and actuator thereof - Google Patents

Abstract

A noise reduction rotor assembly and an actuator therefor. The noise reduction rotor assembly comprises a rotor body and a supporting block; the rotor body is provided with an axial through hole extending along the axial direction, the axial through hole is a step hole, the axial through hole comprises a large hole and a small hole, and a step surface is formed between the large hole and the small hole; the supporting block is arranged in the big hole and is connected with the rotor body; the bottom surface of the supporting block is provided with a protruding part and an oil storage groove, the protruding part is abutted against the step surface, and the oil storage groove stores grease; the support block has an axially extending central through bore, the central through bore and the aperture for the rotor shaft to pass through. The utility model has low running noise.

Description

Noise reduction rotor assembly and actuator

Technical Field

The utility model relates to actuator technology.

Background technique

As users' requirements for the comfort of the car driving environment become higher and higher, the requirements for the working noise of the actuator are also becoming more and more stringent. In automotive actuators, since there is a clearance fit between the inner hole of the rotor and the rotor shaft, during the rotation of the motor rotor, the radial unbalanced magnetic field force will cause the inner hole of the rotor and the rotor shaft to collide at high frequency and generate noise. The larger the clearance, the greater the noise.

Summary of the invention

The technical problem to be solved by the utility model is to provide a rotor assembly with low running noise and an actuator thereof.

An embodiment of the utility model provides a noise reduction rotor assembly, including a rotor body and a support block; the rotor body has an axial through hole extending in the axial direction, the axial through hole is a step hole, the axial through hole includes a large hole and a small hole, and a step surface is formed between the large hole and the small hole; the support block is arranged in the large hole and is connected to the rotor body; the bottom surface of the support block is provided with a protrusion and an oil storage groove, the protrusion abuts the step surface, and grease is stored in the oil storage groove; the support block has a central through hole extending in the axial direction, and the central through hole and the small hole are used for the rotor shaft to pass through.

An embodiment of the utility model also provides an actuator, including a shell and a rotor shaft, the shell having an inner cavity, and the actuator also includes the aforementioned noise reduction rotor assembly, the noise reduction rotor assembly and the rotor shaft are arranged in the inner cavity; the rotor shaft passes through the central through hole of the support block and the small hole of the rotor body, and the two ends of the rotor shaft are respectively fixed to the top and bottom of the shell, and the rotor shaft and the central through hole of the support block and the small hole of the rotor body are all clearance fit.

The utility model has at least the following technical effects:

1. The support block of the embodiment of the utility model is provided with an oil storage groove, which can store lubricating grease. After being assembled with the rotor body, an oil filling space is formed between the bottom surface and the step surface of the support block. Driven by the centrifugal force of the rotor rotation, the lubricating grease is thrown out and fills the matching gap between the rotor shaft and the shaft hole. The lubricating oil film can absorb part of the energy and partially convert the concentrated load into a distributed load, thereby reducing the friction between the rotor shaft and the shaft hole, and maintaining lasting lubrication during long-term load-carrying movement, thereby achieving the effect of shock absorption and noise elimination;

2. The inner hole length of the traditional rotor (especially the plastic rotor) with the clearance between the rotor shaft is long, and it is difficult to control the accuracy of the entire rotor inner hole, which is easy to cause noise problems caused by excessive clearance between a certain position of the rotor inner hole and the rotor shaft. However, the embodiment of the utility model only needs to control the accuracy of the central through hole of the support block (making the clearance between the central through hole of the support block and the rotor shaft smaller than the clearance between the small hole of the rotor body and the rotor shaft), which can avoid the noise problem caused by excessive clearance between the rotor inner hole and the rotor shaft, and reduce the manufacturing difficulty.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 shows a schematic cross-sectional view of a noise reduction rotor assembly according to an embodiment of the present utility model.

FIG. 2 shows a three-dimensional schematic diagram of a support block according to an embodiment of the present utility model.

FIG3 is a schematic diagram showing a noise reduction rotor assembly according to an embodiment of the present utility model when it is assembled on an actuator.

FIG. 4 shows a schematic top view of an actuator according to an embodiment of the present invention.

FIG5 shows a schematic cross-sectional view of the A-A section of FIG4 .

Detailed ways

The utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

Please refer to Figures 1 to 3. A noise reduction rotor assembly 100 according to an embodiment of the present invention includes a rotor body 1 and a support block 2.

The rotor body 1 has an axial through hole 10 extending in the axial direction. The axial through hole 10 is a stepped hole. The axial through hole includes a large hole 101 and a small hole 102 . A step surface 103 is formed between the large hole 101 and the small hole 102 .

The support block 2 is disposed in the large hole 101 and connected to the rotor body 1. In this embodiment, the outer circumference of the support block 2 is interference fit with the hole wall of the large hole 101, but it is not limited thereto, and other connection methods such as riveting may also be used.

The bottom surface of the support block 2 is provided with a protrusion 21 and an oil storage groove 22. The protrusion 21 abuts against the step surface 103, so that an oil injection space g is formed between the bottom surface of the support block 2 and the step surface 103. Grease is stored in the oil storage groove 22. The provision of the oil storage groove helps to keep the grease in the rotor assembly continuously and stably. The support block 2 also has a central through hole 20 extending in the axial direction. The central through hole 20 and the small hole 102 are used for the rotor shaft to pass through. In a specific embodiment, the apertures of the central through hole 20 and the small hole 102 are the same.

In this embodiment, the raised portion 21 includes a plurality of radially extending ribs 211. In the example of FIG. 2, there are four ribs 211, which are evenly distributed around the central through hole 20, and the aforementioned oil storage groove 22 is provided between each two adjacent ribs 211.

In this embodiment, the rotor body 1 and the support block 2 are made of plastic. The rotor body 1 includes a thick portion 11 with a larger outer diameter and a thin portion 12 with a smaller outer diameter. A large hole 101 is provided in the thick portion 11, and a small hole 102 is provided in the thin portion 12. A plurality of permanent magnets 13 are provided on the outer peripheral surface of the thick portion 11 at intervals along the circumferential direction.

Furthermore, the hole wall of the large hole 101 is provided with an annular step 104, and the large hole 101 is divided into a fine hole 1011 and a coarse hole 1012 by the annular step 104, and the fine hole 1011 is adjacent to the small hole 102. The support block 2 is arranged in the fine hole 1011.

Please refer to Figure 4 and Figure 5. The actuator 200 according to this embodiment includes a housing 3, a rotor shaft 4 and the noise reduction rotor assembly 100.

The housing 3 has an inner cavity 30, and the noise reduction rotor assembly 100 and the rotor shaft 4 are arranged in the inner cavity 30. The rotor shaft 4 passes through the central through hole 20 of the support block 2 and the small hole 102 of the rotor body 1, and the two ends of the rotor shaft 4 are respectively fixed to the top and the bottom of the housing 3, and the rotor shaft 4 is clearance-fitted with the central through hole 20 of the support block and the small hole 102 of the rotor body.

The support block of the utility model embodiment is provided with an oil storage groove for storing lubricating grease. After being assembled with the rotor body, an oil filling space is formed between the bottom surface and the step surface of the support block. Driven by the centrifugal force of the rotor rotation, the lubricating grease is thrown out and fills the matching gap between the rotor shaft and the shaft hole. The lubricating oil film can absorb part of the energy and partially convert the concentrated load into a distributed load, thereby reducing the friction between the rotor shaft and the shaft hole and maintaining lasting lubrication during long-term load-bearing movement, thereby achieving the effect of shock absorption and noise elimination.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (9)

1. A noise reduction rotor assembly, characterized in that it comprises a rotor body and a support block; The rotor body has an axial through hole extending in the axial direction, the axial through hole is a stepped hole, the axial through hole includes a large hole and a small hole, and a stepped surface is formed between the large hole and the small hole; The support block is arranged in the large hole and connected to the rotor body; the bottom surface of the support block is provided with a protrusion and an oil storage groove, the protrusion abuts the step surface, and grease is stored in the oil storage groove; the support block has a central through hole extending in the axial direction, and the central through hole and the small hole are used for the rotor shaft to pass through. 2 . The noise reduction rotor assembly according to claim 1 , wherein the protrusion comprises a plurality of radially extending ribs. 3 . 3. The noise reduction rotor assembly according to claim 2 is characterized in that the number of the convex ribs is four, the four convex ribs are evenly distributed around the central through hole, and the oil storage groove is provided between every two adjacent convex ribs. 4 . The noise reduction rotor assembly according to claim 1 , wherein the outer circumferential surface of the support block is interference fit with the hole wall of the large hole. 5. The noise reduction rotor assembly according to claim 1, characterized in that the rotor body comprises a thick portion with a larger outer diameter and a thin portion with a smaller outer diameter, the large hole is arranged in the thick portion, and the small hole is arranged in the thin portion. 6 . The noise reduction rotor assembly according to claim 5 , wherein a plurality of permanent magnets are provided on the outer peripheral surface of the thick portion at intervals along the circumferential direction. 7. The noise reduction rotor assembly according to claim 1 or 5, characterized in that the hole wall of the large hole is provided with an annular step, the large hole is divided into a fine hole and a coarse hole by the annular step, and the fine hole is adjacent to the small hole; The supporting block is disposed in the fine hole. 8. The noise reduction rotor assembly according to claim 1 or 5, characterized in that the rotor body and the support block are both made of plastic. 9. An actuator, comprising a housing and a rotor shaft, wherein the housing has an inner cavity, wherein the actuator further comprises a noise reduction rotor assembly according to any one of claims 1 to 8, wherein the noise reduction rotor assembly and the rotor shaft are arranged in the inner cavity; The rotor shaft passes through the central through hole of the support block and the small hole of the rotor body, and the two ends of the rotor shaft are respectively fixed to the top and bottom of the shell. The rotor shaft and the central through hole of the support block and the small hole of the rotor body are all clearance-fitted.