WO2017124638A1

WO2017124638A1 - Low-noise high-vibration totally enclosed micro motor

Info

Publication number: WO2017124638A1
Application number: PCT/CN2016/077780
Authority: WO
Inventors: 邵国良
Original assignee: 四川安和精密电子电器有限公司
Priority date: 2016-01-20
Filing date: 2016-03-30
Publication date: 2017-07-27
Also published as: CN105990947B; CN105990947A

Abstract

Disclosed is a low-noise high-vibration totally enclosed micro motor, comprising a shell. A stator assembly, a rotor assembly (6) and an end cap assembly (2) of the motor are arranged in the enclosed shell. An electrical terminal (1) of the end cap assembly is exposed out of a barrel-shaped shell. A bearing support (5) and an oil gasket (53) are additionally arranged in the direction of an oscillator (4) so that the noise level of the motor can be reduced and the production efficiency can be enhanced. The bearing support is closely combined with the shell via four convex walls (51) arranged at the periphery so that the bearing support is prevented from being separated. The content of lubricating oil contained can be saved by the oil gasket, effectively reducing noise.

Description

Low noise and high vibration fully enclosed micro motor

Technical field

The invention relates to the field of motors, in particular to a low noise and high vibration fully enclosed miniature motor.

Background technique

The miniature vibration motor is mainly used in mobile phones, Smart-watch, Bluetooth devices, PAD, Notebook and other electronic products, and functions as a silent vibration reminder. The traditional SMD motor structure is generally exposed to the vibrator, and the outer casing and the bracket are combined to fix the motor. During the assembly and test of the motor, the failure of the motor shaft after bending and the motor noise have always been a problem for manufacturers and customers.

The present applicant has proposed a micromotor and its support for the problem of 2015104651877, which surrounds the motor body by using a rectangular parallelepiped barrel structure. In this scheme, only the feasibility of the technology is considered, and no detailed scheme is proposed for the specific implementation of the technology, and the scheme can only be regarded as a semi-closed, and both ends of the outer casing are open, in use, because of the openness The outer casing makes the motor still have severe vibration and a lot of noise, which is not suitable for large-area use. Especially because of the open structure, during the soldering process, the solder has a high probability of entering the housing and affecting the main body of the motor. Therefore, the semi-closed structure is not suitable for mass production, and the quality of the motor cannot be greatly improved. The role.

Summary of the invention

The object of the present invention is to provide a completely new motor structure, which completely encloses the vibrator assembly and the rotor assembly in the outer casing, and integrates the outer casing and the structure of the bracket, thereby effectively reducing production cost and improving production efficiency, and significantly improving the motor satisfaction. Reliability test requirements: such as motor landing test. High temperature storage. Low temperature storage. Salt spray test. At the same time, the bearing bracket and the oil storage pad are added at the front end of the vibrator, which fully ensures the lubrication between the bearing and the shaft, and significantly reduces the motor noise.

To achieve the above object, the present invention adopts the following technical solutions:

A low noise, high vibration fully enclosed miniature motor comprising a housing, a stator assembly of the motor, The rotor assembly and the end cap assembly are each disposed within a hermetic housing, the electrical terminals of the end cap assembly being exposed outside of the barrel housing.

In the above technical solution, the rotary bearing in the rotor assembly passes through the vibrator and is fixedly connected to the vibrator.

In the above technical solution, the bearing bracket is included, and the portion of the rotating shaft passing through the end surface of the vibrator is connected to the bearing hole at the center of the bearing bracket.

In the above technical solution, a positioning recess is provided in an end surface of the outer casing opposite to the end cap assembly.

A low noise and high vibration fully enclosed micromotor according to

claim

3 or 4, wherein an oil storage sealing gasket is disposed between the end surface of the outer casing on which the positioning recess is provided and the bearing bracket.

In the above technical solution, the oil storage sealing gasket is disposed in the positioning recess.

In the above technical solution, the inner wall of the bearing hole at the center of the bearing bracket is provided with a groove having the same center as the bearing hole.

In the above technical solution, the lubricating oil is provided in the groove for lubricating the rotating shaft and reducing noise.

In the above technical solution, the outer wall of the bearing bracket is uniformly provided with a plurality of convex walls on the same circumference.

In the above technical solution, the inner wall of the outer casing is provided with a step which is coaxial with the outer casing.

In the above technical solution, the step on the inner wall of the outer casing is for supporting the convex wall on the outer wall of the bearing bracket.

In the above technical solution, the vibrator rotation diameter of the motor is smaller than the inner diameter of the outer casing.

In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

The invention adopts a fully enclosed outer casing structure, completely enclosing the main body of the motor in the outer casing, and by providing a bearing bracket inside the outer casing and positioning holes on the outer casing, the entire rotating bearing is connected on the outer casing and the bearing bracket, so that the rotation The shaft does not have a large amount of vibrational deviation during the rotation, resulting in bending of the rotating shaft;

The closed outer casing can significantly improve the moisture resistance of the motor, ensure the effective life of the motor parts and extend the life of the motor.

In the current trend of increasingly thin and light mobile phones, the space of various components of mobile phones has become increasingly tight, and the enclosed space can eliminate the interference of other components on the motor, such as the deformation of the wires and the casing. In Among the causes of motor failure after the mobile phone is grounded, the deformation of other components causes the motor to be crushed, which is an important factor. The closed structure can completely eliminate this hidden danger and greatly improve the reliability of the motor.

The plane of the bracket is on the same level as the plane of the power-on terminal, which can be conveniently used for SMT mounting with a robotic grab motor, which is fast, fast, safe and reliable.

In the invention, a groove is arranged on the bearing bracket, and lubricating oil is arranged in the groove, so that the rotating shaft is lubricated during the rotating process, and the rotating noise of the rotating shaft can be absorbed by the lubricating oil;

In the invention, in order to prevent leakage of lubricating oil, an oil sealing gasket is arranged between the outer casing and the bearing bracket, the lubricating oil is absorbed by the gasket, and the gasket also functions as a shock absorber;

The invention can significantly reduce the noise of the motor, strongly improve the product quality, and ensure the product is stable and reliable.

DRAWINGS

The invention will be illustrated by way of example and with reference to the accompanying drawings in which:

Figure 1 is a schematic view of the overall structure of the invention;

Figure 2 is a cross-sectional view of the outer casing of the present invention;

Figure 3 is a combination view of the bearing bracket of the present invention;

Figure 4 is a combination view of the bearing bracket of the present invention;

Figure 5 is a motor assembly diagram after removing the outer casing;

Wherein: 1 is a terminal, 2 is an end cap assembly, 3 is a magnet, 4 is a vibrator, 5 is a bearing bracket, 6 is a rotor assembly, 7 is a positioning recess, 8 is a step, 51 is a convex wall, 52 is a groove, 53 is an oil storage sealing gasket, 54 is an oil storage tank, 55 is a semi-arc step with two symmetrical structures of the bearing bracket, 56 is a bottom plane of the bearing bracket, and 57 is an inner plane of the bearing bracket.

detailed description

As shown in FIG. 2, the outer casing of the present invention is a barrel-shaped rectangular parallelepiped structure having one end open and the other end sealed. The main purpose of the present invention is to provide the end cap assembly, the stator assembly and the rotor assembly of the entire motor. All enclosed in the housing, so that the entire motor is formed as a whole, one of them One function is to facilitate installation. A positioning recess is provided in the center of the sealing end face of the housing, and the recess is for placing an oil sealing gasket. The inner diameter of the recess has a strict coaxiality with the outer diameter of the bearing bracket. A portion of the gasket is highly embedded in the bearing bracket, and another portion is highly embedded in the recess of the outer casing. The height of the gasket protruding from the bearing bracket is equal to the height of the recess of the outer casing. There are also two recessed oil reservoirs in the plane of the bearing bracket to store the lubricating oil and ensure sufficient lubricant storage.

A step is provided on a portion of the inner wall of the outer casing adjacent to the positioning recess, the step causing the inner diameter of the outer casing to be divided into two different sections, such that an inner diameter of the open end of the outer casing is larger than a section of the closed end; the function of the step is for supporting and fixing the magnet. Position: The outer diameter of the magnet is larger than the length of the sealing end. After the magnet is placed at the step position, it will remain stationary and then fixed by glue, ensuring that the core position of the rotor assembly is at the magnetic field center of the magnet.

As shown in FIG. 3, the outer surface of the bearing bracket is provided with four convex walls, and the convex walls are uniformly symmetrically disposed on the same circumference of the surface of the bearing bracket outer casing; the diameter of the entire bearing bracket from the center to the outer edge of the convex wall and the outer casing of the motor The inner diameter of the opening section is uniform; the outer diameter of the convex wall is in a clearance fit with the inner diameter of the outer casing, which ensures that the bearing bracket and the inner wall of the outer casing are closely attached to meet the sufficient pushing force requirement.

A positioning through hole is disposed in a center of the bearing bracket, and an annular groove is disposed on an inner wall side of the through hole, the annular groove is concentric with the positioning through hole, and lubricating oil is disposed in the annular groove; the function is when the motor After the rotating shaft is inserted into the positioning through hole, the rotating shaft contacts the lubricating oil during the rotating process, not only can lubricate the rotating shaft, but also can generate noise during the rotating process of the rotating shaft through the physical properties of the lubricating oil. Absorption can reduce the noise generated by the entire motor during operation.

As shown in Figure 4, there are two semi-arc shaped step protrusions at the bottom of the bearing bracket, which are symmetrical and have a width equal to the inner height of the outer casing.

In order to meet different vibration requirements, the length of the copper can be adjusted, and the height of the bottom plane of the bearing bracket and the height of the inner plane can be adjusted accordingly, while meeting the strength requirements and vibration requirements.

As shown in FIG. 5, the end cap assembly, the stator assembly and the rotor assembly of the motor are identical to the existing motor structure when the motor casing is not mounted, and the difference in the present invention is that the rotating shaft passes through the vibrator and is fixedly connected to the vibrator. The portion of the rotating shaft passing through the vibrator is inserted into the positioning through hole on the bearing bracket, so that the rotating shaft is fixed without offset in the working state. The diameter of the vibrator is significantly smaller than the bearing bracket The diameter is such that the vibrator does not come into contact with the inner wall of the motor casing during rotation.

As shown in FIG. 1 , it is a structural schematic diagram after the whole motor is assembled. The assembled motor of FIG. 3 is pressed into the casing of FIG. 2 , and a positioning slit is disposed on one side of the open end of the motor casing, and the gap is The positioning clips on the end cap assembly are matched so that the entire end cap assembly can be positioned and fixed to the outer casing of the motor. In the outer casing, the bearing bracket is supported by the step in the outer casing, and the diameter of the oil storage sealing gasket at the other end of the bearing bracket is It is larger than the diameter of the positioning through hole of the bearing bracket, and the oil sealing gasket, the positioning through hole and the positioning concave hole are all concentric. During the rotation process, the lubricating oil flowing out of the annular groove on the bearing bracket flows into the positioning recessed hole, and is absorbed by the oil storage sealing gasket, so that the space in the entire motor casing does not have excess lubricating oil, and the whole space is ensured. Cleanliness inside.

The whole motor in the invention is completely sealed in the motor casing, and only the end end of the end cap assembly retains the power receiving end. During the welding process of the motor, one side of the outer casing can be directly welded to the circuit board without the need for a conventional The motor can be adjusted to weld, the same effect, because the invention adopts a fully enclosed outer casing, which can completely prevent the solder from entering the motor casing during the welding process and affect the normal operation of the motor. Similarly, because of the fully enclosed structure, the noise generated is significantly lower than that of the open type, and the noise can be absorbed by the lubricating oil.

The invention has obvious advantages over the existing structure motor: high standardization, easy SMT placement, high reliability and low noise, and is a highly competitive and iconic product.

In the trend of increasingly thin and large screens of mobile phones, this motor structure can ensure the improvement of the vibration requirements by lengthening the dimensions of the outer casing and the rotor assembly and the vibrator at a low height. And variations are within the scope of protection of the invention.

The invention is not limited to the specific embodiments described above. The invention extends to any new feature or any new combination disclosed in this specification, as well as any novel method or process steps or any new combination disclosed.

Claims

A low noise and high vibration fully enclosed micromotor characterized by comprising a casing, a stator assembly, a rotor assembly and an end cover assembly of the motor are disposed in a sealed casing, and the electrical terminal of the end cap assembly is exposed in the barrel Outside the outer casing.
A low noise, high vibration, fully enclosed micromotor according to claim 1 wherein the rotating bearing in the rotor assembly passes through the vibrator and is fixedly coupled to the vibrator.
A low noise high vibration fully enclosed micromotor according to claim 2, comprising a bearing bracket, said rotating shaft being connected to a bearing hole at a center of the bearing bracket through a portion of the end face of the vibrator.
A low-noise and high-vibration fully enclosed micromotor according to claim 1, wherein a positioning recess is provided in an end surface of the outer casing opposite to the end cap assembly.
A low noise and high vibration fully enclosed micromotor according to claim 3 or 4, wherein an oil storage sealing gasket is disposed between the end surface of the outer casing on which the positioning recess is provided and the bearing bracket.
A low noise, high vibration, fully enclosed micromotor according to claim 5, wherein said oil storage sealing gasket is disposed in the positioning recess.
A low noise and high vibration fully enclosed micromotor according to claim 3, wherein the inner wall of the bearing hole at the center of the bearing bracket is provided with a groove having the same center as the bearing hole.
A low noise high vibration fully enclosed micromotor according to claim 7, wherein said groove is provided with lubricating oil for lubricating the rotating shaft and reducing noise.
A low noise and high vibration fully enclosed micromotor according to claim 3, wherein a plurality of convex walls are uniformly disposed on the outer wall of the bearing bracket.
A low-noise and high-vibration fully enclosed micromotor according to claim 1, wherein a wall of the outer casing is provided with a step which is coaxial with the outer casing.
A low noise, high vibration, fully enclosed micromotor according to claim 9 or 10, wherein the step on the inner wall of the outer casing is for supporting a convex wall on the outer wall of the bearing bracket.
A low noise, high vibration, fully enclosed micromotor according to claim 11 wherein the vibrator of the motor has a smaller diameter than the inner diameter of the outer casing.