CN217643077U

CN217643077U - Brush positioning tool of brush motor

Info

Publication number: CN217643077U
Application number: CN202220215523.8U
Authority: CN
Inventors: 钱华; 张席铭; 陈辰; 李志鹏
Original assignee: Shanghai Micro Motor Research Institute 21st Research Institute Of China Electronics Technology Corp
Current assignee: Shanghai Micro Motor Research Institute 21st Research Institute Of China Electronics Technology Corp
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-10-21
Anticipated expiration: 2032-01-26

Abstract

The application relates to the technical field of motor production, in particular to brush positioning tool for a brush motor. There is brush motor's brush location frock, there is brush motor to have brush yoke subassembly and commutator, and the brush yoke subassembly includes brush yoke bottom plate and brush subassembly, and the brush subassembly includes brush and conducting strip, and brush location frock includes: the fixing seat comprises a fixing bottom plate; the positioning table is arranged on the fixed bottom plate, and the outer diameter of the positioning table is the same as that of the commutator; the brush holder base plate is arranged on the fixed base plate and coaxially sleeved on the positioning table; the peripheral surface and/or the end surface of the positioning table are/is provided with a plurality of positioning reference lines which are respectively arranged corresponding to the electric brushes, the positioning reference lines form the positioning reference of the corresponding electric brushes, and the electric brushes are aligned with the corresponding positioning reference lines and then fixed on the brush holder base plate.

Description

Brush positioning tool of brush motor

Technical Field

The application relates to the technical field of motor production, in particular to brush positioning tool for a brush motor.

Background

The accuracy requirement of the motor on the position of the electric brush is high, the position of the electric brush is an important condition for ensuring the normal commutation of the brushed direct current motor, if the deviation of the position of the electric brush is large, the performance output of the motor is influenced, and large commutation sparks are generated during the operation process of the motor, so that the abrasion of the electric brush is accelerated, and the service life of the motor is shortened.

At present, the brush subassembly that torque motor is commonly used is "eight" style of calligraphy structure, constitute by brush and conducting strip, the brush welding is in the conducting strip both sides, fix on the brush yoke bottom plate with the structure glue after the brush unit weld is accomplished, constitute the brush yoke subassembly, at fixed mounting brush subassembly in-process, for guaranteeing the position relation between two independent brush subassemblies, the mounting means who now adopts packs into the recess of brush yoke bottom plate for the conducting strip that will constitute the brush subassembly, make brush subassembly and brush yoke bottom plate constitute the brush yoke subassembly. Fixing a brush holder assembly on a process motor in the electrifying operation process, checking the spark condition and the current condition, adjusting the position of a conducting strip in a groove of a bottom plate of the brush holder by using tweezers, and changing the position of an electric brush at the same time until the spark of the electric brush is reduced to the minimum and the current difference in the positive direction and the negative direction is minimum; however, in the adjusting process of the method, power must be supplied, certain potential safety hazards exist, the position adjusting method cannot visually reflect the accuracy of the position of the electric brush, even if the spark and current conditions are adjusted to be minimum, the relative position of the electric brush still has a debugging space, the requirement of the position accuracy of the electric brush cannot be met, and in the adjusting process of an operator, the used tweezers can possibly damage conducting strips or scratch the surface of a commutator.

In addition, after the electric brush assembly is installed, arc running-in (also called electric brush coarse grinding) needs to be carried out on a surface (called a contact surface of the electric brush for short) on the electric brush, wherein the surface is used for being in contact with the outer circle of the motor rotor commutator, so that the contact area between the electric brush and the motor rotor commutator is increased, the abrasion speed of the electric brush is optimized, the quantity of commutation sparks is reduced, and the output performance and the service life of the motor are ensured. The arc running-in method of the contact surface of the electric brush in the prior art comprises the following steps: after the installation of brush subassembly location is accomplished, change the corase grind frock, paste abrasive paper on the arc surface of corase grind frock, the contact surface running-in of abrasive paper and brush realizes the circular arc running-in of the contact surface of brush, but operating procedure is complicated, and the machining precision deviation of brush fitting surface is big.

Therefore, in view of the above-mentioned deficiencies of the prior art, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide a brush location frock that has brush motor to solve or alleviate the problem that exists among the above-mentioned prior art.

In order to achieve the above purpose, the present application provides the following technical solutions: there is brush motor's brush location frock, there is brush motor to have brush yoke subassembly and commutator, the brush yoke subassembly includes brush yoke bottom plate and brush subassembly, the brush subassembly includes brush and conducting strip, its characterized in that, brush location frock includes:

the fixing seat comprises a fixing bottom plate;

the positioning table is arranged on the fixed bottom plate, and the outer diameter of the positioning table is the same as that of the commutator;

the brush holder bottom plate is arranged on the fixed bottom plate and coaxially sleeved on the positioning table;

the positioning table is characterized in that a plurality of positioning reference lines are arranged on the outer peripheral surface and/or the end surface of the positioning table, the plurality of positioning reference lines are respectively arranged corresponding to the electric brushes, the plurality of positioning reference lines form corresponding positioning references of the electric brushes, and the electric brushes are aligned with the corresponding positioning reference lines and then fixed on the brush holder base plate.

Further, the positioning table is rotatably arranged on the fixed bottom plate.

Furthermore, a boss is coaxially arranged on the positioning table, and a containing hole is formed in the fixed base plate;

the brush positioning tool for the brush motor further comprises a bearing, an inner ring of the bearing is connected with the outer peripheral face of the boss, and an outer ring of the bearing is connected with the hole wall of the accommodating hole.

Furthermore, a friction layer is arranged on the peripheral surface of the positioning table so as to perform circular arc running-in on the contact surface of the electric brush when the positioning table rotates.

Further, the electric brush positioning tool of the brush motor further comprises an electric tool, and the electric tool is provided with a rotary output shaft;

the positioning table is provided with an adaptive structure, the axis of the boss passes through the center of the adaptive structure, the adaptive structure is used for being connected with the rotating output shaft of the electric tool, and the positioning table is driven by the electric tool to rotate around the axis of the boss.

Further, the positioning datum line is formed through photoetching.

Furthermore, the fixed seat also comprises a fixed ring plate, and the fixed ring plate is fixedly connected with the fixed bottom plate;

the fixed ring plate is sleeved on the brush holder bottom plate, and the inner diameter of the fixed ring plate is matched with the outer diameter of the brush holder bottom plate.

Furthermore, the positioning table axially protrudes out of the plane where each electric brush is located.

Compared with the closest prior art, the technical scheme of the embodiment of the application has the following beneficial effects:

(1) The utility model discloses can avoid above-mentioned problem, realize simple and convenient, safety, efficient mode, accomplish two processes of brush location and brush corase grind, simplify the process and the brush installation positioning accuracy is high. The brush positioning tool for the brush motor is simple in structure and easy and convenient to machine, the whole installation process is simple and easy to operate, electrification is not needed in the installation process, personal safety of workers is guaranteed, the position of the brush can be directly observed, debugging time is greatly shortened, and working efficiency is improved.

(2) The positioning line of the positioning table is processed by laser marking, the position precision is high, and the distribution accuracy of the position of each electric brush can be ensured.

(3) Through the rotation of the positioning table, the net patterns on the circumferential surface of the positioning table can quickly finish the coarse grinding of the electric brush.

(4) The circumference size of the positioning table is the same as that of the motor commutator, the size precision of the arc surface of the electric brush is high, and the goodness of fit with the contact surface of the motor rotor commutator is high.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. Wherein:

FIG. 1 is a schematic structural view of a brush assembly of a brushed motor;

FIG. 2 is a schematic view of a brush holder base plate of a brush motor;

FIG. 3 is a schematic view of the construction of the brush holder assembly;

FIG. 4 is a schematic structural diagram of a fixing seat of a specific embodiment of a brush positioning tool of a brush motor;

FIG. 5 is a first structural schematic view of a positioning table of an exemplary embodiment of a brush positioning fixture for a brushed motor;

FIG. 6 is a second schematic view of a positioning table of an exemplary embodiment of a brush positioning tool for a brush motor;

FIG. 7 is a schematic assembly diagram of a fixing seat and a positioning table in a specific embodiment of a brush positioning tool of a brush motor;

FIG. 8 isbase:Sub>A cross-sectional view taken at A-A of FIG. 7;

FIG. 9 is a state diagram of a particular embodiment of a brush positioning tool for a brushed motor;

FIG. 10 is a cross-sectional view taken at B-B of FIG. 9;

fig. 11 is an exploded view of fig. 9.

Description of the reference numerals:

1. an electric brush; 2. a conductive sheet; 3. a brush holder base plate; 4. a kidney-shaped hole; 5. fixing the bottom plate; 6. a stationary ring plate; 7. an accommodation hole; 8. a bearing; 9. a threaded hole; 10. a positioning table; 11. a boss; 12. an axial projection; 13. a cross groove; 14. positioning a reference line; 15. reticulate patterns; 16. and (5) fixing the bolt.

Detailed Description

The present application will be described in detail below with reference to the embodiments with reference to the attached drawings. Various examples are provided by way of explanation of the present application and not limitation of the present application. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the application. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present application encompass such modifications and variations as fall within the scope of the appended claims and their equivalents.

In the description of the present application, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", 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 of the present application but do not require that the present application must be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. The terms "connected," "connected," and "disposed" as used herein are intended to be broadly interpreted, and may include, for example, fixed and removable connections; can be directly connected or indirectly connected through intermediate components; the specific meaning of the above terms can be understood as the case may be, to one of ordinary skill in the art.

As shown in fig. 1 to 3, the brush motor has a brush holder assembly including a brush holder base plate 3 and a brush assembly including a brush 1 and a conductive plate 2, and a commutator. Four waist-shaped holes 4 are formed in the brush holder base plate 3, the brush holder assembly is fixed on the stator through bolts penetrating through the waist-shaped holes 4, and the waist-shaped holes 4 are used for allowing fixing bolts 16 to penetrate through in the using process of the brush positioning tool of the brush motor.

The embodiment of the application provides a concrete embodiment of brush location frock of brush motor, as shown in fig. 4-11, brush location frock of brush motor includes fixing base, location platform 10, bearing 8, electric tool.

The fixing base comprises a fixing base plate 5 and a fixing ring plate 6, the fixing ring plate 6 is fixedly connected with the fixing base plate 5 or integrally formed, and the fixing ring plate 6 is coaxial with the fixing base plate 5. The fixing base plate 5 is provided with a receiving hole 7, and the receiving hole 7 is coaxial with the fixing ring plate 6, in this embodiment, the receiving hole 7 is a through hole, and in other embodiments, the receiving hole 7 may also be a blind hole.

The brush yoke bottom plate 3 is fixed on the PMKD 5, and is concrete, is equipped with screw hole 9 on the PMKD 5, and the screw hole 9 matches and the position corresponds with the quantity of waist type hole 4 on the brush yoke bottom plate 3, and fixing bolt 16 passes behind the waist type hole 4 on the brush yoke bottom plate 3 and the 5 spiro union of PMKD, fixes the brush yoke bottom plate 3 on the PMKD 5.

The fixed ring plate 6 is sleeved on the brush holder bottom plate 3, and the inner diameter of the fixed ring plate 6 is matched with the outer diameter of the brush holder bottom plate 3. In other embodiments, the brush holder base plate 3 and the fixing base plate 5 may not be bolted, and the brush holder base plate 3 may be positioned by the cooperation of the fixing ring plate 6 and the brush holder base plate 3.

The positioning table 10 is rotatably arranged on the fixed bottom plate 5: the positioning table 10 is coaxially provided with a boss 11, the inner ring of the bearing 8 is connected with the peripheral surface of the boss 11, the outer ring of the bearing 8 is connected with the hole wall of the accommodating hole 7, and the positioning table 10 is rotatably connected with the fixed seat through the bearing 8. Be connected through bearing 8 between location platform 10 and the fixing base, location platform 10 can be free, nimble rotate, can avoid when adjusting the brush subassembly position, because of location platform 10 to brush 1's interference, lead to the brush subassembly to produce the emergence of the circumstances such as scraping, atress drop.

The brush holder base plate 3 is coaxially sleeved on the positioning table 10, a plurality of positioning reference lines 14 are arranged on the outer peripheral surface and/or the end surface of the positioning table 10, each positioning reference line 14 is respectively arranged corresponding to a preset position of each electric brush 1, each positioning reference line 14 forms a positioning reference of the corresponding electric brush 1, and each electric brush 1 is aligned with the corresponding positioning reference line 14 and then fixed on the brush holder base plate 3 through structural adhesive. In this embodiment, the positioning reference line 14 is provided on the end surface, and the positioning reference line 14 is formed by photolithography. One brush 1 has two boundaries in the circumferential direction of the brush holder base plate 3, each boundary corresponding to one positioning reference line 14. In other embodiments, the positioning reference line 14 may be disposed on the outer circumferential surface, and in this case, the positioning stage 10 is required to protrude from the plane where each brush 1 is located along the axial direction to ensure that the positioning reference line 14 and the brush 1 can be seen at the same time, so as to adjust the position of the brush 1 with the positioning reference line 14 as a reference.

The outer peripheral surface of the positioning table 10 is provided with a friction layer to perform arc running-in on the contact surface of the brush 1 when the positioning table 10 rotates. The outer diameter of the positioning table 10 is the same as that of the commutator, so that the radian of the contact surface of the electric brush 1 after coarse grinding is accurate. The positioning table 10 protrudes out of the plane where each electric brush 1 is located along the axial direction, so that the condition that part of the contact surface of each electric brush 1 is not in circular arc running-in is avoided, and the reliability of circular arc running-in is ensured.

The electric tool is provided with a rotating output shaft, an axial bulge 12 is arranged on the positioning table 10, an adaptive structure is arranged on the axial bulge 12, the center of the adaptive structure is crossed by the axis of the boss 11, the adaptive structure is used for being connected with the rotating output shaft of the electric tool, and the positioning table 10 rotates around the axis of the boss 11 through the driving of the electric tool. Specifically, the adapting structure is the cross slot 13, and the electric tool is an electric screwdriver, which is set because the torque required by the rotation of the positioning table 10 is not large (because the resistance is not large when the positioning table 10 rotates), so that the requirement can be met by the driving of the electric screwdriver, and because the torque required by the rotation of the positioning table 10 is not large, the transmission requirement can be met by the insertion of the electric screwdriver and the cross slot 13.

The embodiment of the application provides a use method of a specific embodiment of a brush positioning tool of a brush motor, which comprises the following steps:

the bearing 8 is first installed in the receiving hole 7 of the fixed base plate 5, and the positioning table 10 is installed on the fixed base through the bearing 8. The brush holder base plate 3 is fixed to the fixing base plate 5 by fixing bolts 16.

A plurality of electric brush assemblies are arranged in a brush holder base plate 3, two electric brushes 1 of one electric brush assembly are aligned with two corresponding positioning reference lines 14 on a positioning table 10 by rotating the positioning table 10, then the positioning table 10 is prevented from rotating, and then the positions of the other electric brush assemblies are adjusted one by one, so that the position of each electric brush 1 is aligned with the corresponding positioning reference line 14, and at the moment, each electric brush 1 is positioned at a position required by design on the brush holder base plate 3. And (3) bonding and fixing each brush component in the brush frame bottom plate 3 by using structural adhesive, and finishing the positioning and installation of the brush components.

The output shaft of an electric tool (an electric screwdriver) is inserted into the cross groove 13 on the positioning table 10, the electric tool is started to drive the positioning table 10 to rotate for a certain time (the working time of the electric tool is determined according to the rotating speed of the electric tool and the processing requirement of circular arc running-in required by the electric brush 1), and the reticulate 15 on the outer circumferential surface of the positioning table 10 can quickly polish the matching surface of the electric brush 1 into a circular arc surface to finish coarse grinding of the electric brush 1.

The fixing bolts 16 are removed and the brush holder assembly is then removed, at which point the brush holder assembly has been positioned and engaged in the arc and is ready for assembly of the brush motor.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. There is brush motor's brush location frock, there is brush motor to have brush yoke subassembly and commutator, the brush yoke subassembly includes brush yoke bottom plate and brush subassembly, the brush subassembly includes brush and conducting strip, its characterized in that, brush location frock includes:

the fixing seat comprises a fixing bottom plate;

the positioning platform is characterized in that a plurality of positioning datum lines are arranged on the outer peripheral surface and/or the end surface of the positioning platform, the plurality of positioning datum lines are respectively arranged corresponding to the electric brushes, the plurality of positioning datum lines form the positioning datum of the corresponding electric brushes, and the electric brushes are aligned with the corresponding positioning datum lines and then fixed on the brush holder base plate.

2. The brush positioning tool for the brush motor according to claim 1, wherein the positioning table is rotatably disposed on the fixed base plate.

3. The brush positioning tool for the brush motor according to claim 2, wherein a boss is coaxially arranged on the positioning table, and a receiving hole is formed in the fixing base plate;

4. The brush positioning tool for the brush motor according to claim 1, wherein a friction layer is provided on the outer circumferential surface of the positioning table to perform arc running-in on the contact surface of the brush when the positioning table rotates.

5. The brush positioning tool for the brushed motor according to claim 3, wherein the brush positioning tool for the brushed motor further comprises an electric tool, and the electric tool is provided with a rotating output shaft;

6. The brush positioning tool for the brush motor according to claim 1, wherein the positioning datum line is formed by photolithography.

7. The brush positioning tool for the brush motor according to claim 1, wherein the fixing base further comprises a fixing ring plate, and the fixing ring plate is fixedly connected with the fixing base plate;

8. The brush positioning tool for the brush motor according to claim 5, wherein the positioning table axially protrudes from a plane where each brush is located.