阅读说明：本技术 碳刷组件、直流电机及碳刷组件的制作方法 (Carbon brush assembly, direct current motor and manufacturing method of carbon brush assembly ) 是由 贠拼搏 于 2021-01-12 设计创作，主要内容包括：本发明涉及电机技术领域,公开了一种碳刷组件、直流电机及碳刷组件的制作方法。所述碳刷组件包括弹臂架、弹臂及碳刷。其中,弹臂架可安装于电机胶盖内；弹臂连接于弹臂架上,且弹臂上设有凹槽；碳刷设置于弹臂上,且位于凹槽远离弹臂架的一侧。本发明提供的碳刷组件可安装于直流电机内,实现直流电机内电流方向的转换,能够有效解决共振及噪声问题。(The invention relates to the technical field of motors and discloses a carbon brush assembly, a direct current motor and a manufacturing method of the carbon brush assembly. The carbon brush assembly comprises a spring arm frame, a spring arm and a carbon brush. Wherein, the elastic arm frame can be arranged in the motor rubber cover; the elastic arm is connected to the elastic arm frame, and a groove is formed in the elastic arm; the carbon brush is arranged on the elastic arm and is positioned on one side of the groove far away from the elastic arm frame. The carbon brush assembly provided by the invention can be installed in a direct current motor, so that the current direction in the direct current motor is converted, and the problems of resonance and noise can be effectively solved.)

1. A carbon brush assembly, comprising:

the elastic arm frame can be arranged in the motor rubber cover;

the elastic arm is connected to the elastic arm frame, and a groove is formed in the elastic arm;

and the carbon brush is arranged on the elastic arm and is positioned on one side of the groove far away from the elastic arm frame.

2. The carbon brush assembly according to claim 1, wherein the groove is a punched groove, and a depth of the groove is 0.8mm to 1.2 mm.

3. The carbon brush assembly according to claim 1, wherein a cross-section of the groove is circular, square, rectangular, triangular, or X-shaped on a plane perpendicular to a depth direction of the groove.

4. The carbon brush assembly according to claim 1, wherein the spring arm is an L-shaped spring plate, the spring arm includes a short side, a long side, and an arc-shaped connecting portion connected between the short side and the long side, the groove and the carbon brush are disposed on the long side, the short side is mounted on the spring arm, and the carbon brush and the short side are located on a same surface of the long side.

5. The carbon brush assembly according to claim 4, wherein a first bent portion is further formed on the long side, the first bent portion is located between the carbon brush and the groove and bent toward a surface where the carbon brush is located, and a bending angle of the first bent portion is 150 ° to 170 °.

6. The carbon brush assembly according to claim 4, wherein fixing holes are formed in the short side of the spring arm and the spring arm support, and the short side of the spring arm is fixed to the spring arm support through a rivet penetrating through the fixing holes.

7. The carbon brush assembly according to claim 4, wherein a second bent portion is formed at one end of the spring arm support for mounting the spring arm, the second bent portion is bent toward a surface of the spring arm, and a bending angle of the second bent portion is 75 degrees;

the bending angle of the arc-shaped connecting part is 75 degrees, and the arc-shaped connecting part is abutted to the second bending part.

8. The carbon brush assembly according to claim 1, wherein the spring arm support is a brass sheet, and the thickness of the spring arm support is 0.5 mm;

the elastic arm is a red copper alloy sheet, and the thickness of the elastic arm is 0.1 mm.

9. A direct current motor comprising a carbon brush assembly according to any one of claims 1 to 8.

10. The manufacturing method of the carbon brush assembly is characterized in that the carbon brush assembly comprises an elastic arm frame, an elastic arm and a carbon brush, a groove is formed in the elastic arm, and the manufacturing method comprises the following steps:

carrying out test modal analysis test on the carbon brush assembly to determine the maximum amplitude position of the elastic arm;

the groove is formed at the position where the amplitude of the elastic arm is maximum.

Technical Field

The invention relates to the technical field of motors, in particular to a carbon brush assembly, a direct current motor and a manufacturing method of the carbon brush assembly.

Background

Carbon brushes are sliding contacts of electrical machines that conduct electrical current, and in dc electrical machines, carbon brushes are used primarily to transfer electrical energy between the stator and rotor.

Chinese utility model patent of application number 201921189233.5 discloses a carbon brush subassembly and motor, wherein, the carbon brush subassembly includes carbon brush, brush arm and connects the electric piece, and the carbon brush is installed on the brush arm, and the brush arm can press the carbon brush on the periphery of motor steering gear, and connects electric piece and brush arm and can electrically conduct, and the electric current on the wire can transmit to the carbon brush through connecting the electric piece and brush arm, and the assembly process of motor can be simplified to above-mentioned carbon brush subassembly, improves the production efficiency of motor. However, the inventor finds that, when the carbon brush assembly is used, as the motor runs and the rotor rotates, relative sliding occurs between the carbon brush and the commutator and the slip ring of the rotor, so that groove-crossing friction occurs between the carbon brush contacts and the commutator, vibration excitation is generated, resonance of the carbon brush assembly, particularly the brush arm, is caused, great noise is generated, and normal use of the motor is affected.

Disclosure of Invention

The invention aims to provide a carbon brush assembly, a direct current motor and a manufacturing method of the carbon brush assembly, and aims to solve the technical problems that the carbon brush assembly and the direct current motor provided with the carbon brush assembly are easy to resonate and generate noise when in use in the related technology.

In order to solve the above problem, in a first aspect, the present invention discloses a carbon brush assembly, including:

the elastic arm frame can be arranged in the motor rubber cover;

the elastic arm is connected to the elastic arm frame, and a groove is formed in the elastic arm;

and the carbon brush is arranged on the elastic arm and is positioned on one side of the groove far away from the elastic arm frame.

Furthermore, the groove is a stamping groove, and the depth of the groove is 0.8 mm-1.2 mm.

Further, on a plane perpendicular to the depth direction of the groove, the cross section of the groove is circular, square, rectangular, triangular or X-shaped.

Further, the spring arm is an L-shaped spring plate, the spring arm comprises a short edge, a long edge and an arc-shaped connecting portion connected between the short edge and the long edge, the groove and the carbon brush are arranged on the long edge, the short edge is arranged on the spring arm frame, and the carbon brush and the short edge are located on the same surface of the long edge.

Further, a first bending part is formed on the long edge, the first bending part is located between the carbon brush and the groove and is bent towards the surface where the carbon brush is located, and the bending angle of the first bending part is 150-170 degrees.

Furthermore, fixing holes are formed in the short edge of the elastic arm and the elastic arm frame, and the short edge of the elastic arm is fixed to the elastic arm frame through a rivet penetrating through the fixing holes.

Furthermore, a second bending part is formed at one end of the elastic arm frame, which is used for mounting the elastic arm, and the second bending part is bent towards the surface where the elastic arm is located, and the bending angle of the second bending part is 75 degrees; the bending angle of the arc-shaped connecting part is 75 degrees, and the arc-shaped connecting part is abutted to the second bending part.

Further, the elastic arm frame is a brass sheet, and the thickness of the elastic arm frame is 0.5 mm.

Furthermore, the elastic arm is a red copper alloy sheet, and the thickness of the elastic arm is 0.1 mm.

According to the carbon brush assembly provided by the invention, the elastic arm is bent and deformed at the position of the groove by arranging the groove on the elastic arm, so that the rigidity of the elastic arm at the position of the groove can be effectively improved, and the resonance problem of the elastic arm can be effectively improved. Through improving the resonance of bullet arm, can reduce the vibration between carbon brush and motor commutator, and then reduce and use the noise, ensure that carbon brush subassembly and the direct current motor of this carbon brush subassembly of installation can normal use. By adopting the carbon brush assembly with the structural design, on the premise of not additionally increasing parts, the conductive performance of the carbon brush assembly is not affected, the resonance resistance of the carbon brush assembly is effectively improved, and the noise problem caused by resonance is solved.

In a second aspect, the invention also discloses a direct current motor, which comprises the carbon brush assembly in the first aspect.

According to the direct current motor, the elastic arm of the carbon brush assembly is provided with the groove, so that the elastic arm generates bending deformation at the position of the groove, the rigidity of the elastic arm can be effectively improved, and the resonance problem of the carbon brush assembly is effectively improved. Through improving the resonance of carbon brush subassembly, can effectively reduce the vibration between carbon brush and motor commutator, and then reduce the noise in the direct current motor use, ensure that direct current motor can normal use.

The invention also discloses a manufacturing method of the carbon brush assembly, the carbon brush assembly comprises an elastic arm frame, an elastic arm and a carbon brush, the elastic arm is provided with a groove, and the manufacturing method comprises the following steps:

carrying out test modal analysis test on the carbon brush assembly to determine the maximum amplitude position of the elastic arm;

the groove is formed at the position where the amplitude of the elastic arm is maximum.

According to the manufacturing method of the carbon brush assembly, the position with the largest amplitude of the elastic arm can be determined by performing test modal analysis and test on the carbon brush assembly, and the groove is formed in the position with the largest amplitude, so that the rigidity of the elastic arm can be effectively improved, and the resonance problem of the elastic arm can be effectively improved. Through improving the resonance of bullet arm, can reduce the vibration between carbon brush and motor commutator, and then reduce and use the noise, ensure that carbon brush subassembly and the direct current motor of this carbon brush subassembly of installation can normal use.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a carbon brush assembly according to an embodiment of the invention;

FIG. 2 is a schematic structural view of a bail arm in the carbon brush assembly shown in FIG. 1;

FIG. 3 is a schematic view of a spring arm of the carbon brush assembly shown in FIG. 1;

fig. 4 is a schematic structural diagram of another carbon brush assembly according to an embodiment of the invention;

FIG. 5 is a schematic view of a spring arm of the carbon brush assembly shown in FIG. 4;

fig. 6 is a schematic structural diagram of another carbon brush assembly according to an embodiment of the invention;

FIG. 7 is a schematic view of a spring arm of the carbon brush assembly shown in FIG. 6;

fig. 8 is a flowchart of a manufacturing method of a carbon brush assembly according to an embodiment of the invention.

The designations in the figures mean:

100. a carbon brush assembly;

10. a boom popping frame; 11. a second bent portion; 12. a U-shaped groove;

20. a spring arm; 21. a short side; 22. a long side; 23. an arc-shaped connecting part; 221. a groove; 222. a clamping hole; 223. a clip sheet; 224. a first bent portion; 225. a third bent portion;

30. a carbon brush;

40. a fixing hole; 41. and (4) riveting.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, which are examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, are not to be construed as limiting the patent. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.

In a first aspect, embodiments of the present invention provide a carbon brush assembly. As shown in fig. 1, 2 and 3, the carbon brush assembly 100 includes a cartridge arm 10, a cartridge arm 20 and a carbon brush 30. Wherein, the elastic arm frame 10 can be installed in the motor rubber cover. The elastic arm 20 is connected to the elastic arm frame 10, and a groove 221 is formed on the elastic arm 20. The carbon brush 30 is disposed on the spring arm 20 and located on a side of the groove 221 away from the spring arm support 10.

The carbon brush assembly 100 may be installed in a dc motor for introducing or discharging dc voltage or dc current. Specifically, in use, the elastic arm frame 10 is installed in the motor rubber cover, and the carbon brush 30 is pressed onto the circumferential surface of the motor commutator by the elastic arm 20. When the motor runs, the commutator is in sliding contact with the carbon brushes 30 and conducts electricity, and the fixed carbon brushes 30 are contacted alternately along with the continuous rotation of the rotor, so that the current direction in the rotor coil can be switched.

According to the carbon brush assembly 100 provided by the invention, the elastic arm 20 is bent and deformed at the position of the groove 221 by arranging the groove 221 on the elastic arm 20, so that the rigidity of the elastic arm 20 at the position of the groove 221 can be effectively improved, and the resonance problem of the elastic arm 20 can be effectively improved. By improving the resonance of the elastic arm 20, the vibration between the carbon brush 30 and the commutator of the motor can be reduced, so that the use noise is reduced, and the carbon brush assembly 100 and the direct current motor provided with the carbon brush assembly 100 can be ensured to be normally used. The carbon brush assembly 100 adopting the structural design ensures that the conductivity of the carbon brush assembly 100 is not affected on the premise of not additionally adding parts, effectively improves the resonance resistance of the carbon brush assembly 100, and solves the noise problem caused by resonance.

It should be noted that, when the carbon brush assembly 100 is used, the spring arm support 10 needs to be installed in the motor rubber cover, so that the constraint rigidity is high and resonance is not easy to occur; the carbon brush 30 is generally formed by sintering graphite and other materials, and has a hexahedral block structure as a whole, which is high in rigidity and is not likely to resonate.

In one embodiment provided by the present invention, the groove 221 is a stamped groove 221. The groove 221 is manufactured by using a die and a stamping device, so that the operation is simple, the efficiency is high, and the material consumption is low.

Optionally, the depth of the groove 221 is 0.8mm to 1.2 mm.

It should be noted that the specific size and position of the groove 221 should be determined by finite element analysis according to the mode shape and frequency of the resonance of the elastic arm 20. Groove 221 is designed to ensure that groove 221 does not interfere with the original bend, cuff, etc. configuration of spring arm 20 and other components used in conjunction therewith.

The shape of the groove 221 is not unique according to the mode shape of the elastic arm 20.

For example, in an embodiment provided by the present invention, if the elastic arm 20 has a first-order bending resonance to generate vibration noise, as shown in fig. 1 and 3, the cross section of the groove 221 may be designed to be circular in a plane perpendicular to the depth direction of the groove 221.

For example, in an embodiment provided by the present invention, if the elastic arm 20 has a second-order bending resonance to generate vibration noise, as shown in fig. 4 and 5, the cross section of the groove 221 may be designed to be square in a plane perpendicular to the depth direction of the groove 221.

For example, in an embodiment provided by the present invention, if the elastic arm 20 has a second order torsional resonance to generate vibration noise, as shown in fig. 6 and 7, the cross section of the groove 221 may be designed to be X-shaped in a plane perpendicular to the depth direction of the groove 221.

Of course, in other embodiments, the cross section of the groove 221 may also be rectangular or triangular on a plane perpendicular to the depth direction of the groove 221, which is not limited herein as the case may be.

In one embodiment of the present invention, as shown in fig. 1 and 3, the elastic arm 20 is an L-shaped elastic sheet, the elastic arm 20 includes a short side 21, a long side 22 and an arc-shaped connection portion 23 connected between the short side 21 and the long side 22, the groove 221 and the carbon brush 30 are disposed on the long side 22, the short side 21 is mounted on the elastic arm frame 10, and the carbon brush 30 and the short side 21 are located on the same surface of the long side 22.

As shown in fig. 1 and fig. 3, the carbon brush 30 is a convex block-shaped component, and the long side 22 of the elastic arm 20 is provided with a clamping hole 222 which is matched and clamped with the convex side of the carbon brush 30. The carbon brush 30 is fixed on the elastic arm 20 in a clamping manner, so that the carbon brush is convenient to disassemble and assemble and easy to replace.

In order to ensure the fixing effect of the clamping hole 222, in an embodiment of the present invention, as shown in fig. 1 and 3, the clamping hole 222 is a square trumpet-shaped clamping hole, and a clamping piece 223 capable of pressing the carbon brush 30 is further disposed on an edge of the clamping hole 222.

In order to further improve the resonance resistance of the elastic arm 20, in an embodiment of the invention, as shown in fig. 1 and 3, a first bent portion 224 is further formed on the long side 22 of the elastic arm 20, the first bent portion 224 is located between the carbon brush 30 and the groove 221, and is bent toward a surface where the carbon brush 30 is located, and a bending angle of the first bent portion 224 is 160 °. By designing the first bending part 224, the bending deformation of the long side 22 of the elastic arm 20 can be improved, and the groove 221 prestressed area is formed, so that the rigidity of the elastic arm 20 is effectively enhanced, and the resonance resistance of the elastic arm is improved. In addition, the first bending part 224 bends toward the surface where the carbon brush 30 is located, so that the pressing effect of the elastic arm 20 on the carbon brush 30 can be ensured, and the carbon brush 30 can be firmly pressed onto the circumferential surface of the motor commutator in use.

Of course, in some embodiments, the bending angle of the first bent portion 224 may also be any value within 150 ° to 170 °, and is not limited herein.

In order to facilitate connection between the elastic arm 20 and the elastic arm support 10, in an embodiment of the present invention, as shown in fig. 1, 2 and 3, fixing holes 40 are respectively formed on the short side 21 of the elastic arm 20 and the elastic arm support 10, and the short side 21 of the elastic arm 20 is fixed on the elastic arm support 10 by rivets 41 inserted into the fixing holes 40. The rivet 41 has good connection plasticity and toughness, high reliability, convenient disassembly and assembly and easy inspection.

In order to further improve the resonance resistance of the elastic arm 20, in an embodiment of the present invention, as shown in fig. 1, 2 and 3, a second bent portion 11 is formed at one end of the elastic arm support 10 for mounting the elastic arm 20, the second bent portion 11 is bent toward a surface where the elastic arm 20 is located, a bending angle of the second bent portion 11 is 75 °, a bending angle of the arc-shaped connecting portion 23 is 75 °, and the arc-shaped connecting portion 23 abuts against the second bent portion 11. Through designing the second bending part 11 and the arc-shaped connecting part 23, a groove 221 prestress area can be formed on the elastic arm frame 10 and the elastic arm 20, so that the rigidity of the elastic arm 20 is effectively enhanced, and the resonance resistance of the elastic arm is improved. In addition, the second bending part 11 of the spring arm support 10 abuts against the arc-shaped connecting part 23 of the spring arm 20, so that the strength of the bending part of the carbon brush assembly 100 can be effectively improved, and the damage risk in the use process is reduced.

It should be noted that, as shown in fig. 1 and fig. 2, a U-shaped groove 12 is further formed at an end of the elastic arm frame 10 away from the second bending portion 11, the U-shaped groove 12 is formed by three 90 ° bending angles, a notch thereof is located at a side away from the elastic arm 20, and the U-shaped groove 12 is used for installing and fixing the elastic arm frame 10.

In order to further improve the resonance resistance of the elastic arm 20, in an embodiment of the invention, as shown in fig. 1 and 3, a third bent portion 225 is further formed on the long side 22 of the elastic arm 20, the third bent portion 225 is located between the groove 221 and the arc-shaped connecting portion 23 and bent toward a side away from the carbon brush 30, and a bending angle of the third bent portion 225 is 160 °. By designing the third bending part 225, the bending deformation of the long side 22 of the elastic arm 20 can be improved, and the groove 221 prestressed area is formed, so that the rigidity of the elastic arm 20 is effectively enhanced, and the resonance resistance of the elastic arm is improved.

Of course, in some embodiments, the bending angle of third bent portion 225 may also be any value within 150 ° to 170 °, and is not limited in this regard.

In one embodiment of the present invention, the elastic arm frame 10 is brass, and the thickness of the elastic arm frame 10 is 0.5 mm. The brass material has higher strength and good plasticity, and the elastic arm frame 10 made of the brass material has stable structure and is not easy to deform.

In one embodiment of the present invention, the elastic arm 20 is made of copper alloy, and the thickness of the elastic arm 20 is 0.1 mm. The red copper alloy material has good electrical conductivity and thermal conductivity, and can rapidly conduct out heat generated by the rotation of the carbon brush 30.

In a second aspect, embodiments of the present invention further provide a dc motor, including the carbon brush assembly 100 as in the first aspect.

The direct current motor provided by the embodiment of the invention is internally provided with the carbon brush assembly 100, wherein the elastic arm frame 10 of the carbon brush assembly 100 is arranged in the motor rubber cover, and the carbon brush 30 is pressed onto the circumferential surface of the motor commutator under the action of the elastic arm 20. When the direct current motor operates, the commutator is in sliding contact with the carbon brushes 30 and conducts electricity, and the commutator is in continuous rotation with the rotor and alternately contacts the fixed carbon brushes 30, so that the current direction in the rotor coil can be switched.

According to the direct current motor provided by the invention, the elastic arm 20 of the carbon brush assembly 100 is provided with the groove 221, so that the elastic arm 20 is bent and deformed at the position of the groove 221, the rigidity of the elastic arm 20 can be effectively improved, and the resonance problem of the carbon brush assembly 100 is further effectively improved. By improving the resonance of the carbon brush assembly 100, the vibration between the carbon brush 30 and the motor commutator can be effectively reduced, so that the noise of the direct current motor in the use process is reduced, and the direct current motor can be normally used.

In a third aspect, an embodiment of the present invention further provides a manufacturing method of the carbon brush assembly 100, where the carbon brush assembly 100 includes a spring arm support 10, a spring arm 20 disposed on the spring arm support 10, and a carbon brush 30 disposed on the spring arm 20, and the spring arm 20 is further provided with a groove 221. As shown in fig. 1 and 8, the manufacturing method of the carbon brush assembly 100 includes:

s1: and (4) performing test mode analysis test on the carbon brush assembly 100, and determining the position where the amplitude of the elastic arm 20 is maximum.

By performing a test modal analysis test on the carbon brush assembly 100, the resonance frequency and the resonance mode of the spring arm 20, that is, the mode can be determined, so that the maximum amplitude position of the spring arm 20 can be determined. The resonance resistance of the elastic arm 20 can be effectively improved by improving and optimizing the structure at the maximum position of the amplitude of the elastic arm 20.

It should be noted that, when the carbon brush assembly 100 is used, the spring arm support 10 needs to be installed in the motor rubber cover, so that the constraint rigidity is large and resonance is not easy to occur; the carbon brush 30 is generally formed by sintering graphite and other materials, and has a hexahedral block structure as a whole, which is high in rigidity and is not likely to resonate.

S2: a groove 221 is formed at the maximum amplitude position of the elastic arm 20.

The shape of the groove 221 is not unique according to the mode shape of the elastic arm 20. For example, if the elastic arm 20 has first-order bending resonance to generate vibration noise, the cross section of the groove 221 may be circular in a plane perpendicular to the depth direction of the groove 221; if the elastic arm 20 has second-order bending resonance to generate vibration noise, the cross section of the groove 221 may be square on a plane perpendicular to the depth direction of the groove 221; if the elastic arm 20 has second order torsional resonance to generate vibration noise, the cross section of the groove 221 may be X-shaped on a plane perpendicular to the depth direction of the groove 221. Of course, in other embodiments, the cross section of the groove 221 may also be rectangular or triangular on a plane perpendicular to the depth direction of the groove 221, which is not limited herein as the case may be.

According to the manufacturing method of the carbon brush assembly 100, the position with the largest amplitude of the elastic arm 20 can be determined by performing test mode analysis and test on the carbon brush assembly 100, the groove 221 is formed in the position with the largest amplitude, the rigidity of the elastic arm 20 can be effectively improved, and therefore the resonance problem of the elastic arm 20 can be effectively improved. By improving the resonance of the elastic arm 20, the vibration between the carbon brush 30 and the commutator of the motor can be reduced, so that the use noise is reduced, and the carbon brush assembly 100 and the direct current motor provided with the carbon brush assembly 100 can be ensured to be normally used.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.