Motor rear end cover assembly

Abstract

The invention relates to the technical field of motors, in particular to a rear end cover assembly of a motor. A motor rear end cover assembly disclosed by the present invention comprises a circuit board, a brush carrier plate and a rear end cover which are sequentially arranged along the axial direction of a motor, an assembly space supported by a support column is arranged between the brush carrier plate and the rear end cover, a component is arranged in the assembly space, the component at least comprises a carbon brush assembly fixed on the brush carrier plate, and the carbon brush assembly is fixed on the brush carrier plate. And a first powder storage tank is at least arranged below each carbon brush assembly in the rear end cover. According to the invention, carbon powder generated by the carbon brush can be prevented from scattering on the circuit board so as to guarantee stable power supply and operation of the motor.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a rear end cover assembly of a motor. Background Art

[0002] Chinese patent application with application number 200920186974.8 discloses a rear end cover assembly of an automobile blower motor, including a rear end cover, a brush holder plate and a carbon brush. The brush holder plate is provided with two arc edges, and the carbon brush is connected to the side of the brush holder plate facing the motor. Pins that are inserted into holes at corresponding positions of the rear end cover are respectively provided in the middle of the arc edges on both sides of the brush holder plate facing the rear end cover, and bolt through holes connected to the rear end cover are respectively provided on both sides of each pin. A limit block that extends from the rear end cover to the motor housing is provided on the side of the brush holder plate facing the motor.

[0003] When the existing brushed motor is working, the carbon powder generated by the carbon brush during the rotation process will scatter on the circuit board, and then the carbon powder will cover the inside of the motor. After the voltage breakdown test, it is found that there is a breakdown point on the circuit board, which causes the motor leakage current to affect the power supply operation of the motor. In the above technical scheme, since the carbon brush is connected to the side of the brush holder plate facing the motor, it is impossible to avoid the carbon powder generated by the carbon brush from scattering on the circuit board and covering the inside of the motor, thereby causing the voltage breakdown of the circuit board and affecting the power supply operation of the motor. Summary of the invention

[0004] The object of the present invention is to provide a motor rear end cover assembly which can prevent carbon powder generated by a carbon brush from being scattered on a circuit board.

[0005] To achieve the above-mentioned purpose, the present invention discloses a motor rear end cover assembly, including a circuit board, a brush holder plate and a rear end cover arranged in sequence along the axial direction of the motor, an assembly space supported by support columns is provided between the brush holder plate and the rear end cover, components are provided in the assembly space, and the components at least include a carbon brush assembly fixed on the brush holder plate, and a first powder storage tank is provided in the rear end cover at least below each of the carbon brush assemblies.

[0006] When the motor is working, the carbon brush assembly is worn due to its own rotation, resulting in the scattering of carbon powder. At this time, the support column arranged between the brush holder plate and the rear end cover separates the two to form an assembly space, so that the carbon brush assembly is suspended relative to the rear end cover. Since the circuit board is arranged on the side of the brush holder plate away from the carbon brush assembly, the carbon powder generated by the carbon brush assembly cannot be scattered on the circuit board. The generated carbon powder is collected by the powder storage tank, further reducing the possibility of carbon powder covering the circuit board.

[0007] The present invention redesigns the layout of the rear end cover assembly of the motor, arranges the circuit board on the side of the brush holder plate away from the carbon brush assembly, and uses support columns to form an assembly space between the brush holder plate and the rear end cover, so that the carbon brush assembly is suspended, thereby preventing carbon powder generated by the carbon brush during rotation from directly scattering and covering the circuit board, avoiding the problem of circuit board withstand voltage breakdown caused by carbon powder covering, causing motor leakage current. The present invention has the advantage of preventing carbon powder generated by the carbon brush from scattering on the circuit board, so as to ensure stable power supply and operation of the motor.

[0008] Preferably, the opening of the first powder storage tank can cover the projection of the carbon brush assembly on the rear end cover along the axial direction of the motor, thereby increasing the probability that the carbon powder generated by the carbon brush is preferentially covered in the first powder storage tank.

[0009] Preferably, the rear end cover is further provided with second powder storage tanks located on both sides of the first powder storage tank.

[0010] By arranging the first powder storage tank and the second powder storage tank, the rear end cover is made uneven relative to one end of the carbon brush assembly, thereby further increasing the surface area on the rear end cover, thereby increasing the amount of carbon powder required to form a carbon powder layer on the rear end cover, thereby extending the time required for excessive accumulation of carbon powder in the assembly space.

[0011] Preferably, the carbon brush assembly includes a carbon brush body, a brush braid, a brush holder for wrapping the carbon brush body, and a carbon brush base plate, the brush holder includes a wrapping portion in a semi-enclosed box-shaped structure and a pin portion arranged on the wrapping portion, the pin portion is a deformable insert structure, the pin portion is used to assemble the brush holder with the brush frame plate, the carbon brush body is arranged in the wrapping portion of the brush holder, the carbon brush base plate is arranged between the brush holder and the brush frame plate, and the brush holder pin portion passes through the carbon brush base plate and the brush frame plate and is snapped onto the back side of the brush frame plate.

[0012] The carbon brush body is fixed by the wrapping part of the brush holder, and is fixed to the brush holder plate by the pin part, so that it is suspended relative to the rear end cover; the carbon brush bottom plate is used to prevent the carbon brush body from directly contacting the brush holder plate.

[0013] Preferably, the carbon brush bottom plate and the brush holder plate are connected to each other and are provided with a first through hole for routing the brush braid, thereby providing space for routing the brush braid.

[0014] Preferably, a relief groove opening along the assembly direction of the carbon brush body is provided on the wrapping portion of the brush holder, and the relief groove is used to provide a clearance space for the brush braid.

[0015] The avoidance groove provides a clearance space for the brush braid, so that after the carbon brush body is worn, when the brush braid slowly moves toward the inside of the brush holder, space is provided for the brush braid to move, thereby preventing the brush braid from getting stuck.

[0016] Preferably, the support column includes a first fixed column and a second fixed column, the first fixed column is provided with four groups and is arranged between the brush frame plate and the rear end cover along the four corners of the rectangle, the second fixed column is provided with two groups and is arranged between two groups of the first fixed columns on the same side relative to the length direction of the rectangle, the axial ends of the two second fixed columns pass through the brush frame plate, one axial end of the second fixed column is connected to the rear end cover, and the other axial end of the second fixed column is used to be connected to the front end cover screw of the motor.

[0017] Four groups of first fixing columns arranged along the four corners of the rectangle are used to make the brush frame plate and the rear end cover relatively suspended, providing assembly space for components, and the second fixing columns are used to ensure the overall structural stability of the brush frame plate; wherein the first fixing columns, the second fixing columns and the brush frame plate are integrally injection molded.

[0018] Preferably, the first fixing column is in a straight cylindrical structure, a window is provided at one axial end of the first fixing column close to the brush frame plate, and the first fixing column is fixedly connected to the brush frame plate at one axial end close to the brush frame plate.

[0019] The first fixing column and the brush holder plate are fixedly connected by screws. The window is used to observe the screw connection status and facilitate wiring in the first fixing column.

[0020] Preferably, two of the first fixing columns located at diagonally opposite corners of the rectangle are provided with grounding terminals, and the grounding terminals are arranged in the openings.

[0021] The grounding terminal grounds the motor to prevent the motor housing from being electrified, thereby ensuring personal safety and normal operation of the equipment.

[0022] Preferably, the circuit board is provided with a notch for avoiding the first fixing column and the second fixing column, thereby facilitating the arrangement of the circuit board on the side of the brush holder plate away from the carbon brush assembly, thereby preventing the circuit board from interfering with the internal wiring of the first fixing column and the second fixing column.

[0023] The present invention can prevent carbon powder generated by the carbon brush during rotation from directly scattering and covering the circuit board, thereby avoiding leakage current of the motor. It has the advantage of preventing carbon powder generated by the carbon brush from scattering on the circuit board, thereby ensuring stable power supply and operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A structural schematic diagram of the present invention.

[0025] Figure 2 It is a structural schematic diagram of the present invention from another angle.

[0026] Figure 3It is a schematic diagram of the explosion structure of the present invention.

[0027] Figure 4 It is a bottom view structural schematic diagram of the brush holder plate of the present invention.

[0028] Figure 5 It is a schematic structural diagram of the carbon brush assembly of the present invention.

[0029] In the figure: 11, rear end cover; 12, powder storage tank; 121, second powder storage tank; 13, brush holder plate; 131, first assembly hole; 132, welding point hole; 14, first fixing column; 141, window; 15, second fixing column; 151, flat part; 16, capacitor; 17, inductor; 18, carbon brush bottom plate; 19, brush holder; 20, carbon brush body; 201, brush braid; 21, circuit board; 211, notch; 22, first through hole; 23, lead wire; 24, line card slot; 25, line card; 26, pressure plate frame. DETAILED DESCRIPTION

[0030] The present invention will be further described below based on the accompanying drawings and specific embodiments.

[0031] Depend on Figure 1 As shown, this embodiment discloses a motor rear end cover assembly, including a circuit board 21, a brush holder plate 13 and a rear end cover 11 arranged in sequence from the inside to the outside of the motor, the circuit board 21 and the brush holder plate 13 are provided with a plurality of solder point holes 132 for component pins to pass through, a support column is provided between the brush holder plate 13 and the rear end cover 11, and the support column includes a first fixing column 14 and a second fixing column 15, Figure 3 As shown, the circuit board 21 is provided with a notch 211 for avoiding the first fixing column 14 and the second fixing column 15, and the brush holder plate 13 and the rear end cover 11 are supported by the first fixing column 14 and the second fixing column 15 to form an assembly space. Figure 4 As shown, components and a pressure plate frame 26 for axially limiting the bearing in the rear end cover 11 are arranged in the assembly space. The components include a capacitor 16, an inductor 17, an ultrasonic welding column and two carbon brush assemblies for sliding contact with the commutator of the motor. The two carbon brush assemblies are symmetrically arranged with the axis of the brush frame plate 13 as the center. Figure 5 As shown, the carbon brush assembly includes a carbon brush body 20, a brush braid 201, a brush holder 19 for wrapping the carbon brush body 20, and a carbon brush bottom plate 18. A first powder storage tank 12 is provided in the rear end cover 11 at least below each carbon brush assembly. The opening of the first powder storage tank 12 can cover the projection of the carbon brush assembly on the rear end cover 11 along the axial direction of the motor. The rear end cover 11 is also provided with second powder storage tanks 121 located on both sides of the first powder storage tank 12. Figure 2As shown, a line card slot 24 for use with a line card 25 is provided at one end of the rear end cover 11 away from the axis. The line card 25 is engaged with the inner wall of the line card slot 24 to fix the lead-out wire 23 used to form a current loop on the rear end cover 11 .

[0032] Depend on Figure 5 As shown, the brush holder includes a wrapping portion in a semi-enclosed box-shaped structure and a pin portion arranged on the wrapping portion, the pin portion is a deformable insert structure, and the pin portion is used to assemble the brush holder 19 with the brush holder plate 13, the carbon brush body 20 is arranged in the wrapping portion of the brush holder 19, and the carbon brush base plate 18 is arranged between the brush holder 19 and the brush holder plate 13. The brush holder plate 13 and the carbon brush base plate 18 are both provided with a first assembly hole 131 for the pin portion of the brush holder 19 to pass through, and the pin portion of the brush holder 19 can pass through the first assembly hole 131 and be snapped on the back side of the brush holder plate 13. The carbon brush base plate 18 and the brush holder plate 13 are connected to each other with a first through hole 22 for routing the brush braid 201, and the wrapping portion of the brush holder 19 is provided with an avoidance groove opening along the assembly direction of the carbon brush body 20, and the avoidance groove is used to provide a clearance space for the brush braid 201.

[0033] Four groups of first fixing columns 14 are provided and are arranged between the brush frame plate 13 and the rear end cover 11 along the four corners of the rectangle. The first fixing columns 14 are in a straight cylindrical structure. A window 141 is provided at one axial end of the first fixing columns 14 close to the brush frame plate 13. Two first fixing columns 14 located at the diagonal positions of the rectangle are provided with grounding terminals with grounding plates. The grounding terminals are arranged in the windows 141. One axial end of the first fixing columns 14 close to the brush frame plate 13 is fixedly connected to the brush frame plate 13 by screws; two groups of second fixing columns 15 are provided and are arranged between two groups of first fixing columns 14 on the same side relative to the length direction of the rectangle. The two second fixing columns 15 are both in a tubular structure. A flat portion 151 is provided on one side of the circumferential surfaces of the two second fixing columns 15 away from each other. The axial ends of the two second fixing columns 15 pass through the brush frame plate 13, one axial end of the second fixing column 15 is connected to the rear end cover 11, and the other axial end of the second fixing column 15 is used to be connected with the front end cover screw of the motor.

[0034] First, assemble the carbon brush base plate 18 to the end of the brush holder plate 13 close to the rear end cover 11, and make the pin part of the brush holder 19 pass through the carbon brush base plate 18 and the first assembly hole 131 in the brush holder plate 13 in turn, and then rivet the brush holder 19 and the carbon brush base plate 18 to the end of the brush holder plate 13 close to the rear end cover 11, and place the circuit board 21 to the end of the brush holder plate 13 away from the rear end cover 11, and then weld the pin part of the brush holder 19 to the circuit board 21, and then weld the ultrasonic welding column, capacitor 16, inductor 17, and grounding terminal with grounding plate through the welding point hole 132 to fix, and then pass the brush braid 201 of the carbon brush body 20 through the first through hole 22 to the end of the circuit board 21 away from the brush holder plate 13 and weld it, and then fix the brush holder plate 13 with four screws. It is installed on the rear end cover 11, and then the lead wire 23 used to form the current loop is inserted into the wire card 25 slot of the rear end cover 11 through the wire card 25. Finally, the welding points on the circuit board 21 are evenly coated with three-proof paint. When the motor is working, the carbon brush assembly is worn due to its own rotation, resulting in the scattering of the generated carbon powder. At this time, the support column arranged between the brush holder plate 13 and the rear end cover 11 separates the two, so that the carbon brush assembly is suspended relative to the rear end cover 11, and the circuit board 21 is located on the side of the brush holder plate 13 away from the carbon brush assembly, so that the carbon powder generated by the carbon brush assembly cannot be scattered on the circuit board 21, and the powder storage tank 12 of the rear end cover 11 collects the generated carbon powder, further reducing the possibility of carbon powder covering the circuit board 21.

Claims

1. A motor rear end cover assembly, characterized in that: It includes a circuit board, a brush holder plate and a rear end cover which are arranged in sequence along the axial direction of the motor, an assembly space supported by a support column is provided between the brush holder plate and the rear end cover, components are provided in the assembly space, and the components at least include a carbon brush assembly fixed on the brush holder plate, and a first powder storage tank is provided in the rear end cover at least below each of the carbon brush assemblies.

2. The motor rear end cover assembly according to claim 1, characterized in that: The opening of the first powder storage tank can cover the projection of the carbon brush assembly on the rear end cover along the axial direction of the motor.

3. A motor rear end cover assembly according to claim 1 or 2, characterized in that: The rear end cover is also provided with second powder storage grooves located on both sides of the first powder storage groove.

4. The motor rear end cover assembly according to claim 3, characterized in that: The carbon brush assembly includes a carbon brush body, a brush braid, a brush holder for wrapping the carbon brush body, and a carbon brush base plate. The brush holder includes a wrapping portion in a semi-enclosed box-shaped structure and a pin portion arranged on the wrapping portion. The pin portion is a deformable insert structure. The pin portion is used to assemble the brush holder and the brush frame plate. The carbon brush body is arranged in the wrapping portion of the brush holder, and the carbon brush base plate is arranged between the brush holder and the brush frame plate. The pin portion of the brush holder passes through the carbon brush base plate and the brush frame plate and is buckled on the back side of the brush frame plate.

5. The motor rear end cover assembly according to claim 4, characterized in that: The carbon brush bottom plate and the brush holder plate are connected to each other and are provided with a first through hole for routing the brush braid.

6. The motor rear end cover assembly according to claim 4, characterized in that: The wrapping portion of the brush holder is provided with an escape groove which is open along the assembly direction of the carbon brush body, and the escape groove is used to provide a clearance space for the brush braid.

7. The motor rear end cover assembly according to claim 4, characterized in that: The support column includes a first fixed column and a second fixed column, the first fixed column is provided with four groups and is arranged between the brush frame plate and the rear end cover along the four corners of the rectangle, the second fixed column is provided with two groups and is arranged between the two groups of the first fixed columns on the same side relative to the length direction of the rectangle, the axial ends of the two second fixed columns pass through the brush frame plate, one axial end of the second fixed column is connected to the rear end cover, and the other axial end of the second fixed column is used to be connected to the front end cover screw of the motor.

8. The motor rear end cover assembly according to claim 7, characterized in that: The first fixing column is in a straight cylindrical structure, and a window is provided at one axial end of the first fixing column close to the brush frame plate. The first fixing column is fixedly connected to the brush frame plate at one axial end close to the brush frame plate.

9. The motor rear end cover assembly according to claim 7, characterized in that: Two of the first fixing columns located at diagonally opposite corners of the rectangle are provided with grounding terminals, and the grounding terminals are arranged in the openings.

10. The motor rear end cover assembly according to claim 4, characterized in that: The circuit board is provided with a notch for avoiding the first fixing column and the second fixing column.

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