Micro motor shell and micro motor

Abstract

A micro motor shell and a micro motor are characterized in that the micro motor shell comprises a shell main body part and an elastic column part which are integrally formed, the elastic column part is used for being connected with the end of a central shaft of the micro motor, the elastic column part is formed on the local surface of the shell main body part in a protruding mode, one end of the elastic column part extends to form a free end, and the other end of the elastic column part extends to form a free end. And the elastic column part is made of a non-rigid material and has elastic deformation for supporting the reciprocating rotation of the central shaft. The shell of the micro motor is provided with the elastic column part, the elastic column part and the shell are integrally formed, and the elastic column part has elastic deformation and certain supporting strength and can support the central rotating shaft to rotate in a reciprocating mode. According to the utility model, the integrally formed elastic column part is arranged on the shell to replace a conventional metal elastic sheet, so that the noise during the operation of the motor can be greatly reduced, the structure is simpler, the service life is longer, the reduction of the size of the motor is facilitated, the practicability is very strong, and the motor is suitable for being vigorously popularized.

Description

Technical Field

[0001] The utility model relates to the field of micro motors, in particular to a micro motor housing and a micro motor. Background Art

[0002] Micromotors are widely used in the fields of electric toothbrushes, electric toys, etc., and usually include a central shaft, a stator assembly, a rotor assembly and a housing. The central shaft forms a high-frequency reciprocating rotation under the interaction of the stator assembly and the rotor assembly. In order to support the high-frequency reciprocating rotation of the central shaft, a metal shrapnel is usually arranged between the end of the central shaft and the housing, and the metal shrapnel is used to provide auxiliary force by torsional deformation to facilitate the return of the central shaft. For example, the shrapnel 20 set in CN202111573979.8, the shrapnel 40 set in CN201822016682.1, and the shrapnel 9 set in CN201621308223.5. The shrapnel in the prior art is a separate part, and is usually made of metal material. It needs to be assembled between the central shaft and the housing. Therefore, it involves more parts and assembly steps, and the structure is relatively complex. Moreover, the metal shrapnel will generate certain noise during the high-frequency reciprocating rotation of the central shaft, which is not conducive to reducing the overall noise of the micromotor device. Moreover, the metal shrapnel of this structure is prone to fatigue failure after being used a certain number of times, and its service life needs to be improved. Utility Model Content

[0003] The utility model aims to solve the above problems and provides a micro motor housing and a micro motor which can reduce noise and simplify structure.

[0004] In order to solve the above problems, the utility model provides a micro motor housing, characterized in that it includes an integrally formed shell body and an elastic column portion, the elastic column portion is used to connect with the end of the central axis of the micro motor, the elastic column portion is protruded and formed on the local surface of the shell body portion, one end of the elastic column portion extends to form a free end, and the elastic column portion is made of non-rigid material and has an elastic deformation amount that supports the reciprocating rotation of the central axis.

[0005] Furthermore, the elastic column portion includes a first column portion and a second column portion which are coaxially arranged, the first column portion is connected between the shell body portion and the second column portion, and the second column portion is used to be connected to the central axis of the micro motor.

[0006] Furthermore, the first column portion includes a plurality of elastic unit portions distributed at intervals, and the elastic unit portion includes a first end and a second end that are oppositely arranged, the first ends are connected to each other to form a joint portion, and the second ends are spaced from each other.

[0007] Furthermore, the second column portion is cylindrical.

[0008] Furthermore, a diameter of the second column portion is larger than a transverse dimension of the coupling portion and smaller than a transverse dimension of the first column portion.

[0009] Furthermore, the elastic unit parts are arranged in a manner of being spaced apart at a first angle and a second angle, the first angle ranges from 40° to 50°, and the second angle ranges from 130° to 140°.

[0010] Furthermore, the shell body and the elastic column are made of a composite material with resin as the matrix material, the composite material has a tensile strength of 50-100MPa, a tensile modulus of 2500-4000MPa, a tensile elongation at break of 3%-8%, a flexural strength of 90-150MPa, and a flexural modulus of 2500-4000MPa.

[0011] Furthermore, a receiving groove is provided on the shell body, and the elastic column portion is provided in the receiving groove and is spaced apart from a side wall of the receiving groove.

[0012] Furthermore, the shell body includes a first body and a second body, the second body is arranged at the end of the first body, a step is formed at the joint, and the accommodating groove passes through the second body and extends into the first body.

[0013] In addition, the utility model also provides a micro motor, which includes a central shaft, a rotor assembly, a stator assembly and a shell, and is characterized in that at least one end of the central shaft is arranged in the shell, and the shell includes the aforementioned shell, and the elastic column portion of the shell is located in the shell and connected to the end of the central shaft. During operation, the stator assembly and the rotor assembly interact with each other to drive the central shaft to reciprocate, and the elastic deformation of the elastic column portion can support the reciprocating rotation of the central shaft.

[0014] The beneficial contribution of the utility model is that it effectively solves the above-mentioned problems. The micro motor housing of the utility model is provided with an elastic column, which is integrally formed with the housing and has elastic deformation and a certain supporting strength, and can support the reciprocating rotation of the central shaft. The utility model can greatly reduce the noise during the operation of the motor by providing an integrally formed elastic column on the housing to replace the conventional metal shrapnel, and the structure is simpler, the service life is longer, and it is also conducive to reducing the size of the motor. It has strong practicality and should be vigorously promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a micro motor housing.

[0016] Figure 2 It is a plan view of the micro motor housing.

[0017] Figure 3 is another schematic diagram of the micro motor housing.

[0018] Figure 4 It is a structural diagram of a micro motor.

[0019] Figure 5 It is a structural cross-sectional view of a micro motor.

[0020] Illustrations: shell 100, shell body 10, accommodating groove 11, first body 12, second body 13, enclosure 14, lead hole 15, limit portion 16, elastic column 20, first column 21, elastic unit 221, first end 2211, second end 2212, coupling portion 222, second column 22, first angle 31, second angle 32, center axis 400, rotor assembly 500, stator assembly 600, coil 700. DETAILED DESCRIPTION

[0021] The following embodiments are provided to further explain and supplement the present invention and do not constitute any limitation to the present invention.

[0022] like Figure 1 to Figure 3 As shown, the micro motor housing 100 of the present invention comprises an integrally formed housing body 10 and an elastic column 20 , wherein the elastic column 20 is used to connect with the end of the central shaft 400 of the micro motor to support the reciprocating rotation of the central shaft 400 .

[0023] The elastic column 20 is formed protrudingly on a partial surface of the shell body 10, and one end thereof extends to form a free end. The elastic column 20 is made of a non-rigid material and has an elastic deformation amount to support the reciprocating rotation of the central shaft 400.

[0024] The elastic column 20 is integrally formed with the shell body 10, and its processing is simple, which can not only reduce the cost, but also simplify the assembly process of the micro motor. In addition, the elastic column 20 is made of non-rigid material, which can greatly reduce the noise when the motor is running compared to the traditional structure using metal springs, and has the characteristics of long service life.

[0025] The processing materials of the elastic column 20 and the shell body 10 are not limited, and they are made of non-rigid materials with certain strength and elastic deformation. In this embodiment, the micro motor housing 100 can be made of a composite material with resin as the matrix material, such as plastic. In this embodiment, the micro motor housing 100 is preferably formed in one piece by a PPS composite material. Further, the tensile strength of the PPS composite material is 50-100MPa, the tensile modulus is 2500-4000MPa, the tensile elongation at break is 3%-8%, the bending strength is 90-150MPa, and the bending modulus is 2500-4000MPa. Further, the tensile strength of the PPS composite material is preferably 70MPa, the tensile modulus is preferably 3200Mpa, the tensile elongation at break is 5%, the bending strength is preferably 110MPa, and the bending modulus is 3100MPa.

[0026] In other embodiments, the micro motor housing 100 may also be integrally formed of other materials, which is not limited in this embodiment.

[0027] Furthermore, if Figure 1 to Figure 3 As shown, the elastic column 20 includes a first column 21 and a second column 22 coaxially arranged. The first column 21, the second column 22 and the shell body 10 are integrally formed. The first column 21 is connected between the shell body 10 and the second column 22, and the first column 21 is mainly used to support the reciprocating rotation of the central shaft 400 and provide a corresponding force for the reciprocating rotation of the central shaft 400. The second column 22 is used to connect with the central shaft 400 of the micro motor, for example, plugged together with the central shaft 400, so that when the central shaft 400 reciprocates, the elastic column 20 can follow the rotation of the central shaft 400 and deform elastically.

[0028] Furthermore, if Figure 1 to Figure 3 As shown, the first column portion 21 includes a plurality of elastic unit portions 221 that are spaced apart. The elastic unit portion 221 includes a first end 2211 and a second end 2212 that are arranged opposite to each other. The first ends 2211 are connected to each other to form a joint portion 222. The second ends 2212 are spaced apart from each other. The joint portion 222 is coaxial with the second column portion 22. The first column portion 21 formed by connecting a plurality of elastic unit portions 221 can improve the overall mechanical properties of the elastic column portion 20, such as tensile strength, tensile modulus, bending strength and bending modulus, so that the elastic column portion 20 can better support the central axis 400 to reciprocate along its axis.

[0029] The specific shape of the elastic unit portion 221 is not limited, and the elastic unit portion 221 is block-shaped as a whole, for example, it may be a block-shaped with a rectangular or quasi-rectangular cross section, or it may be a block-shaped with an elliptical or quasi-elliptical cross section.

[0030] The number of the elastic unit parts 221 can be set as needed. In this embodiment, the number of the elastic unit parts 221 is preferably set to four.

[0031] In some embodiments, Figure 3 As shown, the elastic unit parts 221 are arranged at even intervals.

[0032] In some embodiments, Figure 2 As shown, the elastic unit parts 221 are symmetrically arranged, and the multiple elastic unit parts 221 are arranged in a manner of being spaced apart at a first angle 31 and a second angle 32, wherein the first angle 31 ranges from 40° to 50°, and the second angle 32 ranges from 130° to 140°. In a specific embodiment, the first angle 31 and the second angle 32 are both fixed values, for example, the first angle 31 is 45°, and the second angle 32 is 135°. In different embodiments, the values ​​of the first angle and the second angle may be different.

[0033] When four elastic unit portions 221 are provided and are arranged in a distributed manner at intervals of the first angle 31 and the second angle 32 , every two elastic unit portions 221 are collinear and pass through the center of the elastic column portion 20 .

[0034] The plurality of elastic unit portions 221 are arranged in a manner of being spaced apart at the first angle 31 and the second angle 32 , which can effectively reduce the resistance of the central shaft 400 during reciprocating rotation and make the output more uniform and stable.

[0035] Furthermore, in some embodiments, the second column portion 22 is cylindrical and is used to be inserted into the end of the central shaft 400 .

[0036] Furthermore, a diameter of the second column portion 22 is larger than a transverse dimension of the coupling portion 222 , and smaller than a transverse dimension of the first column portion 21 .

[0037] Furthermore, in order to integrally form the elastic column 20 in the housing 100, a receiving groove 11 is provided on the housing body 10. The elastic column 20 is provided in the receiving groove 11 and is spaced apart from the side wall of the receiving groove 11.

[0038] The bottom end of the elastic column portion 20 is integrally formed with the bottom of the receiving groove 11 , and the elastic column portion 20 vertically protrudes from the bottom of the receiving groove 11 .

[0039] The shape of the receiving groove 11 is not limited, and it can be a circular groove or a rectangular groove. In this embodiment, the receiving groove 11 is a rectangular groove, and the elastic column portion 20 is disposed at the center of the receiving groove 11 .

[0040] The depth of the receiving groove 11 can be set as required. In this embodiment, the elastic column portion 20 is higher than the depth of the receiving groove 11 , and the free end of the elastic column portion 20 extends out of the receiving groove 11 .

[0041] Furthermore, the second column portion 22 and a portion of the first column portion 21 of the elastic column portion 20 both extend out of the receiving groove 11 .

[0042] Further, for easy installation, the shell body 10 includes a first body 12 and a second body 13. The first body 12 and the second body 13 are integrally formed. The second body 13 is arranged at the end of the first body 12, and a step is formed at the joint. The second body 13 has a larger lateral dimension, which is used to mate with other parts of the shell; the first body 12 has a smaller lateral dimension, which is conducive to reducing the overall size of the product.

[0043] The receiving groove 11 is disposed on the first main body portion 12 and the second main body portion 13 , wherein the receiving groove 11 penetrates the second main body portion 13 and extends into the first main body portion 12 .

[0044] An extending direction of the receiving groove 11 is consistent with an extending direction of the second main body portion 13 .

[0045] Furthermore, in order to facilitate the matching with other parts of the housing, a clamping step and a blocking portion 14 extending along the axial direction are provided on the side of the second main body portion 13 away from the first main body portion 12. The blocking portion 14 has any shape.

[0046] Furthermore, in order to facilitate the lead-in of the coil 700 , a plurality of lead-in holes 15 are provided on the second main body portion 13 .

[0047] Furthermore, in order to facilitate the restriction of the rotation amplitude of the rotor assembly 500, a limiting portion 16 is provided on the side of the second main body portion 13 away from the first main body portion 12. The limiting portion 16 protrudes from the end surface of the second main body portion 13 and extends in the axial direction. The limiting portions 16 are symmetrically distributed on both sides of the accommodating groove 11, and the corners of the limiting portions 16 can restrict the maximum rotation amplitude of the rotor assembly 500. When the rotor assembly 500 rotates in the space between the limiting portions 16, when the rotation is interfered with by the corners of the limiting portions 16, the rotor assembly 500 cannot continue to rotate, thereby facilitating the return of the rotor assembly 500 and the central axis 400.

[0048] In addition, if Figure 4 , Figure 5 As shown, the utility model also provides a micro motor.

[0049] The micro motor includes a central shaft 400, a rotor assembly 500, a stator assembly 600 and a housing. The arrangement of the central shaft 400, the rotor assembly 500 and the stator assembly 600 may refer to the known technology, such as the motor-related patents previously applied for by the applicant. Normally, the rotor assembly 500 is connected to the central shaft 400 and can rotate together. The stator assembly 600 and the rotor assembly 500 are spaced apart from each other, and a coil 700 is provided in the stator assembly 600 or the rotor assembly 500. When the coil 700 is energized, the stator assembly 600 and the rotor assembly 500 can interact with each other to drive the central shaft 400 and the rotor assembly 500 to reciprocate along their axis.

[0050] The housing is used to partially or completely surround the central shaft 400 , the rotor assembly 500 , and the stator assembly 600 to accommodate and support the central shaft 400 , the rotor assembly 500 , and the stator assembly 600 .

[0051] At least one end of the central axis 400 is disposed in the housing, and the housing includes the aforementioned shell 100, that is, the shell 100 includes an integrally formed shell body 10 and an elastic column 20. The elastic column 20 is located in the shell 100 and connected to the central axis 400.

[0052] One end of the central shaft 400 is spaced apart from the housing body 10 and connected to the elastic column 20. When the central shaft 400 reciprocates, the elastic deformation of the elastic column 20 can support the reciprocating rotation of the central shaft 400.

[0053] The connection between the central shaft 400 and the elastic column portion 20 may be an interference fit, or may be adhesively bonded, or may be fixedly connected by combining a plurality of methods.

[0054] In this embodiment, a slot is provided on the end face of the central shaft 400, and the shape of the slot matches the shape of the free end of the elastic column portion 20. The free end of the elastic column portion 20 is inserted into the slot of the central shaft 400, and the two are interference fit, so that the elastic column portion 20 can be twisted and elastically deformed with the reciprocating rotation of the central shaft 400 to assist the central shaft 400 in returning to the correct position.

[0055] Furthermore, in order to ensure the connection reliability between the central shaft 400 and the elastic column part 20, adhesive may be provided between the slot and the elastic column part 20 so that the two are further combined together by the adhesive.

[0056] Furthermore, the second column portion 22 of the elastic column portion 20 is inserted into the slot of the central shaft 400 to form an interference fit.

[0057] Although the present invention is disclosed through the above embodiments, the scope of the present invention is not limited thereto, and the above components may be replaced with similar or equivalent elements known to those skilled in the art without departing from the concept of the present invention.

Claims

1. A micro motor housing, characterized in that: It comprises an integrally formed shell body (10) and an elastic column (20), wherein the elastic column (20) is used to be connected to the end of the central axis (400) of the micro motor, the elastic column (20) is protrudingly formed on a local surface of the shell body (10), one end of the elastic column (20) extends to form a free end, and the elastic column (20) is made of a non-rigid material and has an elastic deformation amount that supports the reciprocating rotation of the central axis (400).

2. The micro motor housing according to claim 1, characterized in that: The elastic column portion (20) comprises a first column portion (21) and a second column portion (22) which are coaxially arranged, wherein the first column portion (21) is connected between the shell body portion (10) and the second column portion (22), and the second column portion (22) is used to be connected to the central axis (400) of the micro motor.

3. The micro motor housing according to claim 2, characterized in that: The first column portion (21) includes a plurality of elastic unit portions (221) distributed at intervals, and the elastic unit portion (221) includes a first end (2211) and a second end (2212) arranged opposite to each other, the first ends (2211) are connected to each other to form a connecting portion (222), and the second ends (2212) are spaced from each other.

4. The micro motor housing according to claim 3, characterized in that: The second column portion (22) is cylindrical.

5. The micro motor housing according to claim 4, characterized in that: The diameter of the second column portion (22) is larger than the transverse dimension of the coupling portion (222), and smaller than the transverse dimension of the first column portion (21).

6. The micro motor housing according to claim 3, characterized in that: The elastic unit parts (221) are arranged in a manner of being spaced apart at a first angle (31) and a second angle (32), wherein the first angle (31) is in the range of 40° to 50°, and the second angle (32) is in the range of 130° to 140°.

7. The micro motor housing according to claim 1, characterized in that: The shell body (10) and the elastic column (20) are made of a composite material with resin as the matrix material, the composite material has a tensile strength of 50-100 MPa, a tensile modulus of 2500-4000 MPa, a tensile elongation at break of 3%-8%, a flexural strength of 90-150 MPa, and a flexural modulus of 2500-4000 MPa.

8. The micro motor housing according to claim 1, characterized in that: A receiving groove (11) is provided on the shell main body (10), and the elastic column portion (20) is arranged in the receiving groove (11) and is spaced apart from the side wall of the receiving groove (11).

9. The micro motor housing according to claim 8, characterized in that: The shell body (10) comprises a first body (12) and a second body (13), wherein the second body (13) is arranged at the end of the first body (12), and a step is formed at the joint thereof. The accommodating groove (11) passes through the second main body portion (13) and extends into the first main body portion (12).

10. A micro motor comprising a central shaft (400), a rotor assembly (500), a stator assembly (600) and a housing, characterized in that: At least one end of the central axis (400) is arranged in the outer shell, and the outer shell includes the shell (100) as described in any one of claims 1 to 9. The elastic column portion (20) of the shell (100) is located in the outer shell and connected to the end of the central axis (400). During operation, the stator assembly (600) and the rotor assembly (500) interact with each other to drive the central axis (400) to reciprocate, and the elastic deformation of the elastic column portion (20) can support the reciprocating rotation of the central axis (400).

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