Brush needle structure of motor rear end cover

Abstract

The utility model discloses a brush needle structure of a rear end cover of a motor. The brush needle structure comprises an end cover body, an electric brush needle and a conductive terminal, a shaft hole used for being connected with a motor rotating shaft is formed in the middle of the end cover body. The electric brush needle is connected with the conductive terminal in a buckling mode, terminal positioning grooves are formed in the portions, on the two sides of the shaft hole, of the end cover body, the conductive terminal is partially arranged in the terminal positioning grooves, and the terminal positioning grooves are used for limiting and fixing the conductive terminal. The two brush needles are symmetrically arranged on the two sides of the shaft hole in the splayed shape and make contact with the surface of the commutator of the motor, the damping strips are arranged on the back faces of the brush needles, the damping strips can provide certain elasticity for the brush needles, the brush needles have the damping function, and therefore the contact performance between the brush needles and the commutator can be effectively improved, and the service life of the motor is prolonged. Therefore, the noise generated in the operation process of the rotor is reduced.

Description

Technical Field

[0001] The utility model relates to the field of micro motor needle brushing, in particular to a needle brushing structure of a rear end cover of a motor. Background Art

[0002] A motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. Its main function is to generate driving torque. It serves as a power source for electrical appliances or various machines. It can be divided into large, medium and micro motors according to its size.

[0003] In the prior art, a micromotor is usually composed of a rear end cover, a stator, and a rotor that rotates relative to the stator. A brush pin is arranged on the rear end cover, and a commutator is arranged on the rotor. The brush pin sequentially contacts and conducts with each commutator segment of the commutator to energize the rotor coil, thereby generating a magnetic field to drive the rotor to rotate continuously. Traditional brush pins are generally in contact with the two ends of the commutator. Since the rotor will generate a certain torque during the rotation process, it is easy to cause the brush pin to swing, which not only makes a lot of noise, but also has poor contact stability, thus affecting the operating performance of the motor; in addition, in the current micromotor rear end cover structure, its component structure arrangement is not compact and stable enough. When the micromotor is used in an environment with relatively severe vibration conditions, the components inside the rear end cover are prone to loosening, affecting the normal use of the motor; and traditional brush pins are generally connected to the positive and negative terminals by welding, which will make the manufacturing process of the micromotor complicated, which is not conducive to the company's rapid assembly and production of micromotors.

[0004] Therefore, the prior art has defects and needs to be improved. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a brush needle structure of a rear end cover of a motor which has good contact performance, stable assembly structure and can realize rapid assembly.

[0006] To achieve this purpose, the utility model adopts the following technical solutions: a brush needle structure of a rear end cover of a motor, comprising an end cover body, a brush needle and a conductive terminal;

[0007] The middle part of the end cover body is provided with an axial hole for connecting with the motor shaft;

[0008] Terminal positioning grooves are provided on the end cover bodies on both sides of the shaft hole, and the conductive terminal parts are arranged in the terminal positioning grooves, and the terminal positioning grooves are used to limit and fix the conductive terminals;

[0009] The brush pin is connected to the conductive terminal by buckling, and the two brush pins are symmetrically arranged on both sides of the shaft hole in an eight-shaped shape;

[0010] The brush needle is used to contact the commutator of the motor. A damping strip is provided on the back of the brush needle. The damping strip is used to provide a downward pulling force for the brush needle.

[0011] By adopting the above technical solution, in the brush needle structure of the rear end cover of the motor, the brush needle includes a fixing part and a brush needle body, the fixing part is connected to the conductive terminal by snapping, and the brush needle body is composed of a plurality of brush needle strips arranged at intervals.

[0012] By adopting the above-mentioned technical solutions, in the brush needle structure of the rear end cover of the motor, a step groove is provided on the back side of one end of the brush needle strip close to the shaft hole, and the step groove is used to interfere with the commutator limit.

[0013] By adopting the above-mentioned technical solutions, in the brush needle structure of the rear end cover of the motor, the conductive terminal includes a hooking portion, a bending portion and a connecting portion;

[0014] The hooking portion is hooked and clamped with the terminal positioning groove, the bending portion is located at the side end of the hooking portion, the connecting portion is vertically arranged with the bottom end of the hooking portion, and the connecting portion passes through the end cover body and is led out from it for connecting a power source.

[0015] By adopting the above-mentioned technical solutions, in the brush needle structure of the rear end cover of the motor, a clamping block is provided in the terminal positioning groove, and a clamping groove that is hooked and engaged with the clamping block is provided on the hooking portion.

[0016] By adopting the above-mentioned technical solutions, in the brush needle structure of the rear end cover of the motor, the bending portion is located outside the terminal positioning groove, a positioning protrusion is provided on the bending portion, and a card hole that is buckled and connected with the positioning protrusion is provided on the fixing part of the brush needle.

[0017] By adopting the above-mentioned technical solutions, in the brush needle structure of the rear end cover of the motor, a limiting groove for limiting and fixing the bending part is further provided on the end cover body.

[0018] By adopting the above-mentioned technical solutions, in the brush needle structure of the rear end cover of the motor, a triangular limit block is provided on the side wall of the connecting part, and a sliding groove for the triangular limit block to slide into is provided in the terminal positioning groove, and when the hooking part is hooked and engaged with the terminal positioning groove, the triangular limit block is used to abut against the side wall edge of the sliding groove.

[0019] By adopting the above-mentioned technical solutions, in the brush needle structure of the rear end cover of the motor, the end of the connecting part is provided with a wiring hole for connecting to the power line.

[0020] By adopting the above-mentioned technical solutions, in the brush needle structure of the rear end cover of the motor, the number of the brush needle strips is four.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The two brush needles of the utility model are symmetrically arranged in an eight-shaped shape on both sides of the shaft hole for contacting the commutator surface of the motor, and a damping strip is provided on the back of the brush needle, which can provide a certain elasticity for the brush needle so that the brush needle has a damping effect, thereby improving the contact performance between the brush needle and the commutator and reducing the generation of noise and vibration; and the brush needle is connected to the conductive terminal by a buckle connection, and when the brush needle is seriously worn, the brush needle can be quickly disassembled for replacement, and maintenance is convenient; the hooking portion of the conductive terminal is connected to the terminal positioning groove by a hooking buckle, the assembly structure is stable and not easy to loosen, and the assembly method is simple, and the conductive terminal only needs to be plugged into the terminal positioning groove; it has the beneficial effects of good contact performance, stable assembly structure, and rapid assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 This is a schematic diagram of the back structure of the utility model;

[0027] Figure 3 This is a schematic diagram of the end cover body structure of the utility model;

[0028] Figure 4 It is a schematic diagram of the connection structure between the conductive terminal and the brush pin of the utility model;

[0029] Figure 5 This is a schematic diagram of the brush needle structure of the utility model;

[0030] Figure 6It is a schematic diagram of the conductive terminal structure of the utility model. DETAILED DESCRIPTION

[0031] In order to make the utility model's purpose, features, and advantages more obvious and easy to understand, the following will be combined with the drawings in the utility model embodiments to clearly and completely describe the technical solutions in the utility model embodiments. Obviously, the embodiments described below are only part of the utility model embodiments, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0033] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0034] like Figures 1 to 6 As shown, the embodiment of the utility model provides a brush needle structure of a rear end cover of a motor, comprising an end cover body 1, a brush needle 2 and a conductive terminal 3;

[0035] The middle part of the end cover body 1 is provided with an axial hole 10 for connecting with the motor shaft; it should be noted that a bearing is provided in the axial hole 10, and the rotor can be firmly fixed in the motor by matching the rotor with the axial hole 10 to ensure the stability and accuracy of the rotor during operation and avoid the rotor from loosening or detaching.

[0036] Terminal positioning grooves 11 are provided on the end cover body 1 on both sides of the shaft hole 10, and the conductive terminal 3 is partially arranged in the terminal positioning grooves 11. The terminal positioning grooves 11 are used to limit and fix the conductive terminal 3 so that the assembly structure of the internal components is stable and not easy to loosen.

[0037] The brush pin 2 is connected to the conductive terminal 3 by snapping, and the two brush pins 2 are symmetrically arranged on both sides of the shaft hole 10 in an eight-shaped shape; the brush pin 2 is used to contact the commutator of the motor, and a damping strip 4 is provided on the back of the brush pin 2, and the damping strip 4 is used to provide a downward pulling force for the brush pin 2. Such an arrangement makes the contact points of the brush pin 2 on the commutator more evenly distributed, and can effectively reduce the swing of the brush pin 2 during the rotation of the rotor, thereby improving the contact performance between the brush pin 2 and the commutator and reducing the generation of noise and vibration.

[0038] like Figure 5 As shown, further, the brush needle 2 includes a fixing portion 21 and a brush needle body 22, the fixing portion 21 is connected to the conductive terminal 3 by snapping, and the brush needle body 22 is composed of a plurality of brush needle strips 220 arranged at intervals. The intervals between the brush needle strips 220 can ensure that the brush needle 2 can adapt to the rotation of the rotor and evenly contact and rub on the surface of the rotor to achieve current transmission and drive of the rotor; the fixing portion 21 of the brush needle 2 is connected to the conductive terminal 3 by snapping, and when the brush needle body 22 is severely worn, the brush needle 2 can be quickly disassembled for replacement, which is convenient for maintenance.

[0039] like Figure 1 and Figure 5 As shown, further, a step groove 221 is provided on the back of one end of the brush needle strip 220 close to the shaft hole 10, and the step groove 221 is used to limit the contact with the commutator. The setting of the step groove 221 can provide a certain support for the brush needle pick. When the motor is running, due to the rotation of the rotor and the inertial force, the brush needle strip 220 will be subjected to a certain vibration and impact. By limiting the contact between the step groove 221 and the commutator, the shaking of the brush needle strip 220 during operation can be reduced.

[0040] like Figure 1 and Figure 4 As shown, further, the conductive terminal 3 includes a hooking portion 31, a bending portion 32 and a connecting portion 33; the hooking portion 31 is connected to the terminal positioning groove 11 by hooking, the bending portion 32 is located at the side end of the hooking portion 31, and the connecting portion 33 is arranged perpendicular to the bottom end of the hooking portion 31, and the connecting portion 33 passes through the end cover body 1 and is led out from it for connecting to a power source. The bending portion 32 is located at the side end of the hooking portion 31, and its function is to provide a certain bending and bending angle to adapt to the layout of the installation structure of the brush needle 2.

[0041] like Figure 3 and Figure 6As shown, further, a clamping block 12 is provided in the terminal positioning groove 11, and a clamping groove 310 is provided on the hooking portion 31 to be hooked and engaged with the clamping block 12. The hooking portion 31 of the conductive terminal 3 is connected to the terminal positioning groove 11 by a hooking buckle, and the assembly method is simple. It only needs to plug the clamping groove 310 of the hooking portion 31 into the clamping block 12 in the terminal positioning groove 11, and the disassembly and assembly are convenient.

[0042] like Figure 1 As shown, further, the bending portion 32 is located outside the terminal positioning groove 11, and a positioning protrusion 321 is provided on the bending portion 32. The fixing portion 21 of the brush pin 2 is provided with a clamping hole 210 that is buckled and connected with the positioning protrusion 321. The brush pin 2 is buckled and connected with the conductive terminal 3. When the brush pin 2 is severely worn, the brush pin 2 can be quickly disassembled for replacement, which is convenient for maintenance.

[0043] like Figure 1 As shown, further, the end cap body 1 is provided with a limiting groove 13 for limiting and fixing the bending portion 32. The limiting groove 13 can reduce the movement and shaking of the conductive terminal 3, thereby ensuring the stability of its position.

[0044] like Figure 2 and Figure 5 As shown, further, a triangular stopper 331 is provided on the side wall of the connecting portion 33, and a slide groove 14 is provided in the terminal positioning groove 11 for the triangular stopper 331 to slide into, and when the hooking portion 31 is hooked and engaged with the terminal positioning groove 11, the triangular stopper 331 is used to abut against the side wall edge of the slide groove 14. The triangular stopper 331 can limit and fix the connecting portion 33 to prevent the connecting portion 33 from loosening during the connection process.

[0045] like Figure 2 and Figure 6 As shown, further, a wiring hole 330 for connecting to a power cord is provided at the end of the connection portion 33. The wiring hole 330 is an interface for connecting the power cord to the motor, and through the wiring hole 330, the wire of the power cord can be inserted into the connection portion 33, so that the power can be transmitted to the motor through the wiring hole 330 to provide the motor with the required power.

[0046] like Figure 5 As shown, further, there are four brush needle bars 220. When the motor is running, the brush needle bars 220 contact the commutator on the motor rotor, and the current is transferred to the motor coil through the brush needle bars 220. By increasing the number of brush needle bars 220, the current can be distributed to more contact points, reducing the amount of current carried by each brush needle bar 220, thereby reducing the current density, reducing heat and voltage drop, and effectively improving the efficiency and stability of the motor.

[0047] The two brush pins 2 of the utility model are symmetrically arranged in an eight-shaped shape on both sides of the shaft hole 10 for contacting the commutator surface of the motor, and a damping strip 4 is provided on the back of the brush pin 2, which can provide a certain elasticity for the brush pin 2, so that the brush pin 2 has a damping effect, thereby improving the contact performance between the brush pin 2 and the commutator and reducing the generation of noise and vibration; and the brush pin 2 is connected to the conductive terminal 3 by snapping, and when the brush pin 2 is seriously worn, the brush pin 2 can be quickly disassembled for replacement, which is convenient for maintenance; the hooking portion 31 of the conductive terminal 3 is connected to the terminal positioning groove 11 by a hooking buckle, the assembly structure is stable and not easy to loosen, and the assembly method is simple, and the conductive terminal 3 only needs to be plugged into the terminal positioning groove 11; it has the beneficial effects of good contact performance, stable assembly structure, and rapid assembly.

[0048] As described above, the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A brush needle structure for the rear end cover of a motor, characterized in that: It includes an end cover body, a brush pin and a conductive terminal; The middle part of the end cover body is provided with an axial hole for connecting with the motor shaft; Terminal positioning grooves are provided on the end cover bodies on both sides of the shaft hole, and the conductive terminal parts are arranged in the terminal positioning grooves, and the terminal positioning grooves are used to limit and fix the conductive terminals; The brush pin is connected to the conductive terminal by buckling, and the two brush pins are symmetrically arranged on both sides of the shaft hole in an eight-shaped shape; The brush needle is used to contact the commutator of the motor. A damping strip is provided on the back of the brush needle. The damping strip is used to provide a downward pulling force for the brush needle.

2. The brush needle structure of the rear end cover of the motor according to claim 1, characterized in that: The brush needle comprises a fixing portion and a brush needle body. The fixing portion is connected to the conductive terminal by snapping, and the brush needle body is formed by a plurality of brush needle strips arranged at intervals.

3. The brush needle structure of the rear end cover of the motor according to claim 2, characterized in that: A step groove is provided on the back side of one end of the brush needle strip close to the shaft hole, and the step groove is used for limiting contact with the commutator.

4. The brush needle structure of the rear end cover of the motor according to claim 2, characterized in that: The conductive terminal includes a hooking portion, a bending portion and a connecting portion; The hooking portion is hooked and clamped with the terminal positioning groove, the bending portion is located at the side end of the hooking portion, the connecting portion is vertically arranged with the bottom end of the hooking portion, and the connecting portion passes through the end cover body and is led out from it for connecting a power source.

5. The brush needle structure of the rear end cover of the motor according to claim 4, characterized in that: A clamping block is arranged in the terminal positioning groove, and a clamping groove which is hooked and engaged with the clamping block is arranged on the hooking portion.

6. The brush needle structure of the rear end cover of the motor according to claim 4, characterized in that: The bending portion is located outside the terminal positioning groove, a positioning protrusion is provided on the bending portion, and a clamping hole which is buckled and connected with the positioning protrusion is provided on the fixing portion of the brush needle.

7. The brush needle structure of the rear end cover of the motor according to claim 6, characterized in that: The end cover body is also provided with a limiting groove for limiting and fixing the bending portion.

8. The brush needle structure of the rear end cover of the motor according to claim 4, characterized in that: A triangular limit block is provided on the side wall of the connecting portion, and a sliding groove for the triangular limit block to slide into is provided in the terminal positioning groove. When the hooking portion is hooked and engaged with the terminal positioning groove, the triangular limit block is used to abut against the side wall edge of the sliding groove.

9. The brush needle structure of the rear end cover of the motor according to claim 8, characterized in that: The end of the connecting part is provided with a wiring hole for connecting with a power line.

10. The brush needle structure of the rear end cover of the motor according to claim 2, characterized in that: The number of the brush needle strips is four.

Images