CN114530967B

CN114530967B - Rear end cover assembly of brush motor

Info

Publication number: CN114530967B
Application number: CN202210069149.XA
Authority: CN
Inventors: 杜姗; 金永波; 马万琪; 余健
Original assignee: Zhejiang Linix Motor Co Ltd
Current assignee: Zhejiang Linix Motor Co Ltd
Priority date: 2022-01-21
Filing date: 2022-01-21
Publication date: 2023-08-22
Anticipated expiration: 2042-01-21
Also published as: CN114530967A

Abstract

The invention relates to a brush motor rear end cover assembly, which belongs to the technical field of brush motors and comprises a rear end cover body and a brush frame plate, wherein at least two brush frames which are arranged oppositely are fixed on the brush frame plate, the brush frames are made of metal with conductive performance, each brush frame comprises a body part and a supporting part which are not contacted with each other, the body part and the supporting part in the same brush frame are conducted through an inductor, the body part is electrically connected with a brush in the brush frame through a first lead, a circuit board with a fuse is bridged between the two brush frames, a second lead electrically connected with the circuit board is led out of the circuit board, and one end of the circuit board and the body part in one brush frame form a non-conductive fixed support. The invention connects the fuse between the two pole brush holders through the circuit board, and the fuse is not in a suspending state, thereby effectively preventing the fuse from failure when the motor is interfered.

Description

Rear end cover assembly of brush motor

Technical Field

The invention relates to a rear end cover assembly of a brush motor, and belongs to the technical field of brush motors.

Background

In the use process of the motor, the phenomenon of burning out of a motor coil caused by overload often occurs. At present, the adopted prevention method mainly fuses the external fuse by self temperature change so as to cut off current, and then cuts off a circuit before the motor fires, so that the fire danger caused by overload of the motor is prevented.

The current chinese patent No. 201820686975.8, patent name is a novel car fusing technology brush yoke's patent, including brush yoke support body, install the rotor in the middle of the upper surface of brush yoke support body, four carbon brushes that are radial are evenly installed to the limit week of rotor, the one end that the rotor was kept away from to the carbon brush is fixed with the carbon brush spring, the upper surface both sides of brush yoke support body all are fixed with the fuse through resistance welding's mode, one side of brush yoke support body is fixed with integrated connector through resistance welding's mode, the inside of brush yoke support body and integrated connector correspond the position through resistance welding's mode welding have the condenser. The electric appliance has the advantages that all electric appliance elements are completely fixed on the metal sheet of the brush holder plate through a resistance welding technology, the welding line is compact, the defects of looseness, cracks and the like are avoided, a good electric loop can be formed between the elements and the brush holder, and therefore stable brush holder performance is obtained. It also has the following disadvantages: the fuse is directly connected to the brush frame, so that the fuse is always in a suspended state, the installation reliability is poor, the fuse is easy to fail when the motor is interfered, and the overload protection of the motor is difficult to stably realize.

Disclosure of Invention

The invention aims to provide a brush motor rear end cover assembly, which solves the problems that in the prior art, a fuse wire is directly connected to a brush frame and can be in a suspended state all the time, the installation reliability is poor, the fuse wire is easy to fail when the motor is interfered, overload protection of the motor is difficult to realize, and the like.

The technical aim of the invention is mainly solved by the following technical scheme: the utility model provides a brush motor rear end cap assembly, includes rear end cap body and brush holder board, be fixed with two at least brush holders that set up relatively on the brush holder board, the brush holder is made by the metal that has conductive properties, the brush holder includes body portion and supporting part that each other is contactless, same body portion in the brush holder and supporting part between realize switching on through the inductance, body portion is connected rather than inside brush electricity through first lead wire, two the cross-over connection has the circuit board that has the fuse between the brush holder, draw forth the second lead wire rather than the electricity connection on the circuit board, the fixed stay of non-conduction is formed with body portion in one of them brush holder to the supporting part in this brush holder draws forth rather than the third lead wire that the electricity is connected, the fixed stay that the circuit board other end forms switching on with the supporting part in another brush holder, the part integration that second lead wire and third lead wire draw forth constitutes and draws forth the pencil.

When the motor overload protection device is used, the second lead wire is conducted with the fuse on the circuit board, the fuse on the circuit board is conducted with the electric brush in one brush frame through the inductor and the first lead wire, in addition, the third lead wire is conducted with the electric brush in the other brush frame through the inductor, and the lead wire harness formed by the second lead wire and the third lead wire is conducted with the motor circuit.

Preferably, the body part is provided with a first vertical piece, the body part is welded with the circuit board through the first vertical piece to form a non-conductive fixed support, the support part is provided with a second vertical piece, and the support part is welded with the circuit board through the second vertical piece to form a conductive fixed support.

Through being formed with first vertical spare on body portion, body portion forms the fixed stay of non-conduction through first vertical spare and circuit board welding, be formed with the second vertical spare on the supporting part, the supporting part forms the fixed stay who switches on through second vertical spare and circuit board welding, through first vertical spare, second vertical spare and circuit board both ends welding in order to realize the fixed mounting of circuit board, and can carry out stable support to the circuit board, the reliability of installation is good, in addition can realize that the circuit board switches on with the brush in one of them brush yoke through the switching on of second vertical spare and circuit board, in order to realize the switching on of motor circuit.

Preferably, the body part and the supporting part are further provided with a first right-angle member and a second right-angle member respectively, one end of the inductor is abutted against the first right-angle member and is welded and fixed with the first right-angle member, and the other end of the inductor is abutted against the second right-angle member and is welded and fixed with the second right-angle member.

Through still being formed with first right-angle component and second right-angle component respectively on body portion and supporting part, inductance one end supports and leans on first right-angle component and forms welded fastening with it, and the inductance other end supports and leans on the second right-angle component and forms welded fastening with it, welds with the inductance both ends through first right-angle component, second right-angle component in order to realize the fixed mounting of inductance to make after the inductance installation can realize switching on between brush holder and the brush.

Preferably, the first right angle member and the second right angle member are located at two sides of the brush which are transversely opposite, and the heights of the first right angle member and the second right angle member are flush and larger than the height of the body part of the outer side part of the brush.

Through setting up first right angle spare and second right angle spare in the horizontal opposite both sides of brush, the high parallel and level of first right angle spare and second right angle spare just is greater than the height of brush outside part body portion for inductance can fixed mounting directly over the brush, makes inductance and brush can be along vertical range upon range of setting, can save the inductance and occupy brush holder board horizontal space, thereby can arrange each component more rationally in limited space, walk line and installation simultaneously also safer.

Preferably, the brush holder plate is further fixed with a torsion spring column located at one side of the brush holder and used for fixing the brush spring, and the transverse section of the second right-angle member is formed with a reinforcing section extending into the interior of the torsion spring column from the free end of the torsion spring column and fixedly connected with the torsion spring column.

Through still being fixed with the torsional spring post that is located brush holder one side and is used for fixed brush spring on the brush holder plate, the transverse section of second right-angle member is formed with the reinforcing section that stretches into its inside and forms fixed connection with it from the free end of torsional spring post for the torsional spring post can carry out fixed support to the transverse section of second right-angle member, can further strengthen the supporting role of second right-angle member, thereby can promote the supporting effect to the inductance, in order to realize the stable installation of inductance.

Preferably, the brush holder plate is fixed at the inner end of the rear end cover body, the brush holder plate and the rear end cover body are concentrically arranged, a bearing placement hole with an inner end opening is formed in the center of the rear end cover body, a wave washer is fixed at the bottom of the bearing placement hole, a bearing positioned at one axial side of the wave washer is also fixed in the bearing placement hole, an extension part extending into the brush holder plate from the opening end of the bearing placement hole is formed in the middle of one contact end of the brush holder plate and the rear end cover body, and the extension end of the extension part is in contact with one axial end of the bearing.

Through being fixed in the inner of rear end cap body with the brush holder plate, the brush holder plate sets up with the rear end cap body is concentric, rear end cap body center department is formed with the bearing of inner opening and places the hole, the bearing is placed the hole bottom and is fixed with wave washer, it is fixed with the bearing that is located wave washer axial one side still to place in the hole, the middle part of brush holder plate and rear end cap body contact one end is formed with the open end that the hole was placed to the bearing stretches into its inside extension, the extension of extension and the axial one end contact of bearing for can realize the axial spacing to the bearing through the extension, can prevent that the bearing from upwards interfering because of wave washer self elasticity and leading to the bearing skew, in order to realize effectively fixing to the bearing.

Preferably, a round yielding hole with a cross-section diameter larger than the inner diameter of the bearing outer ring is formed in the middle of the extending end of the extending part.

The middle part of the extending end of the extending part is provided with the round yielding hole with the opening, and the section diameter of the yielding hole is larger than the inner diameter of the outer ring of the bearing, so that the extending end is only pressed to the outer ring of the bearing and cannot be pressed to the inner ring of the bearing.

Preferably, the center of the brush holder plate is provided with a through hole penetrating through the inner end and the outer end of the brush holder plate, the through hole comprises a small-diameter part communicated with the yielding hole for a power supply motor to pass through and a large-diameter part positioned on one side of the small-diameter part for the commutator to rotate, and an annular end face is formed at the joint of the small-diameter part and the large-diameter part.

Through being formed with the perforation that runs through its inside and outside both ends in brush holder board center department, the perforation includes with the hole intercommunication of stepping down in order to supply motor play axle to pass the path portion and be located path portion one side and be used for commutator pivoted big path portion, the junction of path portion and big path portion is formed with an annular terminal surface for the carbon dust that produces after the brush wearing and tearing in the use can be stored in annular terminal surface department, in order to leave certain storage space for the carbon dust, can prevent that the brush from running the carbon dust for a long time from piling up and causing motor short circuit inefficacy and bearing inefficacy, in order to realize the steady operation of motor.

Preferably, a sealing hole communicated with the bearing placing hole is formed in the center of the rear end cover body, the aperture of the sealing hole is smaller than that of the bearing placing hole, one end, far away from the bearing placing hole, of the sealing hole is communicated with a shaft hole for a motor shaft to pass through, and at least two sealing rings for sealing the motor shaft are overlapped in the sealing hole.

Through be formed with the sealing hole of placing the hole intercommunication with the bearing in rear end cap body center department, the aperture of sealing hole is less than the aperture of hole is placed to the bearing, the one end intercommunication that the hole was placed to the sealing hole was kept away from to the bearing is equipped with the shaft hole that supplies the motor to go out the axle to pass, the stack is equipped with two at least sealing rings that are used for carrying out sealedly to the motor play axle in the sealing hole for the junction between sealing hole and the hole is placed to the bearing can form a step in order to carry out spacingly to the ripple packing ring, and can carry out effective seal to the play axle of motor through the sealing washer that two stacks set up, sealing performance is good.

Preferably, a sealing groove is formed in one side of the outer end of the rear end cover body, cured sealant is filled in the sealing groove, two wiring holes arranged at intervals are formed in the sealing groove close to the side wall of the brush holder plate, a protection coil is fixed to the outer side of the periphery of the sealing groove, and the second lead wire and the third lead wire penetrate through the corresponding wiring holes to extend into the sealing groove and penetrate through the protection coil to extend to the outer side of the motor.

Through being formed with the seal groove in this outer end one side of rear end cap, the seal groove intussuseption is filled with the sealant after the solidification, and the seal groove is close to the lateral wall of brush holder plate and is formed with the wiring hole that two intervals set up, and the circumference outside of seal groove is fixed with the protective coil, and second lead wire and third lead wire pass corresponding wiring hole stretch into in the seal groove and pass the protective coil and extend to the motor outside for can seal in the mode of motor wiring department adoption embedment, sealed performance is good.

Therefore, the fuse is bridged between the two pole brush frames through the circuit board, the opposite ends of the circuit board are fixedly supported through the body part and the supporting part in the two brush frames, the reliability of installation is good, the fuse cannot be in a suspended state, no interference occurs between the two poles, and therefore failure of the fuse when the motor is interfered can be effectively prevented, and overload protection of the motor can be stably realized.

Drawings

FIG. 1 is a schematic top view of the present invention;

FIG. 2 is a schematic perspective view of the present invention;

FIG. 3 is a schematic cross-sectional view of the present invention;

fig. 4 is an enlarged schematic view of the structure of fig. 3 a according to the present invention.

The index marks in the drawings are as follows: 1. a rear end cap body; 2. a brush holder plate; 3. a brush holder; 4. a body portion; 5. a support part; 6. an inductance; 7. a first lead; 8. a brush; 9. a fuse; 10. a circuit board; 11. a second lead; 12. a third lead; 13. a torsion spring column; 14. a first vertical member; 15. a second vertical member; 16. a first right angle member; 17. a second right angle member; 18. bearing placement holes; 19. a wave washer; 20. a bearing; 21. an extension; 22. a relief hole; 23. perforating; 24. a small diameter portion; 25. a large diameter portion; 26. an annular end face; 27. sealing the hole; 28. a shaft hole; 29. a seal ring; 30. sealing grooves; 31. a wiring hole; 32. a protective coil; 33. and a reinforcing section.

Detailed Description

The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings.

As shown in fig. 1 and 2, the rear end cover assembly of the brush motor comprises a rear end cover body 1 and a brush holder plate 2, wherein at least two brush holders 3 which are arranged oppositely are fixed on the brush holder plate 2, the brush holders 3 are made of metal with conductive performance, each brush holder 3 comprises a body part 4 and a supporting part 5 which are not contacted with each other, the body parts 4 are electrically connected with brushes 8 in the brush holders through first leads 7, conduction is realized between the body parts 4 and the supporting parts 5 in the same brush holder 3 through inductors 6, a first right-angle member 16 and a second right-angle member 17 are respectively formed on the body parts 4 and the supporting parts 5, the first right-angle member 16 and the second right-angle member 17 are in L shapes, one end of the inductor 6 is abutted against the first right-angle member 16 and forms welding fixation with the same, the other end of the inductor 6 is abutted against the second right-angle member 17 and forms welding fixation with the same, welding is carried out in a tin soldering mode, the first right-angle member 16 and the second right-angle member 17 are located on two sides of the electric brush 8 transversely opposite to each other, the height of the first right-angle member 16 and the second right-angle member 17 is flush and larger than the height of the body part 4 of the outer side part of the electric brush 8, a torsion spring column 13 which is located on one side of the brush frame 3 and used for fixing the brush spring is further fixed on the brush frame plate 2, the brush spring is sleeved on the torsion spring column 13, and a reinforcing section 33 which extends into the interior of the torsion spring column 13 from the free end of the second right-angle member 17 is formed on the transverse section of the second right-angle member 17 and forms fixed connection with the torsion spring column 13.

As shown in fig. 1 and 2, a circuit board 10 with a fuse 9 is bridged between two brush holders 3, a second lead 11 electrically connected with the circuit board 10 is led out from the circuit board 10, one end of the circuit board 10 forms a non-conductive fixed support with a body part 4 in one brush holder 3, a first vertical part 14 is formed on the body part 4, the body part 4 is welded with the circuit board 10 through the first vertical part 14 to form a non-conductive fixed support, the welding is performed in a tin soldering manner, a third lead 12 electrically connected with the support part 5 in the brush holder 3 is led out from the support part 5 in the other brush holder 3, a second vertical part 15 is formed on the support part 5, the support part 5 is welded with the circuit board 10 through the second vertical part 15 to form a conductive fixed support, the second lead 11 and a part led out from the third lead 12 are integrated to form a lead wire harness.

As shown in fig. 3 and 4, the brush holder plate 2 is fixed at the inner end of the rear end cover body 1, the brush holder plate 2 is connected with the rear end cover body 1 by a screw, the brush holder plate 2 is concentrically arranged with the rear end cover body 1, a bearing placing hole 18 with an opening at the inner end is formed at the center of the rear end cover body 1, a wave washer 19 is fixed at the bottom of the bearing placing hole 18, a bearing 20 positioned at one side of the wave washer 19 in the axial direction is also fixed in the bearing placing hole 18, an extension 21 extending into the brush holder plate 2 from the opening end of the bearing placing hole 18 is formed in the middle of the end, which is contacted with one end of the bearing 20, a round yielding hole 22 is formed in the middle of the extension end of the extension 21, the section diameter of the yielding hole 22 is larger than the inner diameter of the outer ring of the bearing 20, a through hole 23 is formed at the center of the brush holder plate 2, the through hole 23 comprises a small diameter portion 24 communicated with the yielding hole 22 to pass through the power supply shaft and a large diameter portion 25 positioned at one side of the small diameter portion 24 for rotation of the commutator, and a large diameter portion 24 is formed at the end surface of the small diameter portion 24 with the large diameter portion 25.

As shown in fig. 3, a sealing hole 27 communicated with the bearing placing hole 18 is formed in the center of the rear end cover body 1, the aperture of the sealing hole 27 is smaller than that of the bearing placing hole 18, a shaft hole 28 through which a motor shaft passes is formed in one end, far away from the bearing placing hole 18, of the sealing hole 27, at least two sealing rings 29 used for sealing the motor shaft are overlapped in the sealing hole 27, the sealing rings 29 are framework oil seals, a sealing groove 30 is formed in one side of the outer end of the rear end cover body 1, solidified sealing glue is filled in the sealing groove 30, the sealing glue is epoxy resin potting material, two wiring holes 31 which are arranged at intervals are formed in the side wall, close to the brush holder plate 2, of the sealing groove 30, a protection coil 32 is fixed to the outer side of the circumference of the sealing groove 30, and the second lead 11 and the third lead 12 extend into the sealing groove 30 through the corresponding wiring holes 31 and extend to the outer side of the motor through the protection coil 32.

In the embodiment, when the motor is in overload, the fuse 9 is fused through the temperature change of the fuse 9, so that the motor circuit is in an open circuit state, carbon powder generated after the abrasion of the brush 8 in the operation process can be stored at the annular end face 26 to leave a certain storage space for carbon powder, wherein the fuse 9 is bridged between the two pole brush holders 3 through the circuit board 10, the fixed installation of the circuit board 10 is realized by welding two opposite ends of the first vertical piece 14 in the body part 4 and the second vertical piece 15 in the supporting part 5 with the circuit board 10, the fuse 9 is connected to the circuit board 10, the fixed installation of the fuse 9 is realized by welding two ends of the first right-angle piece 16 in the body part 4 and the second vertical piece 17 in the supporting part 5 with the inductance 6.

According to the invention, the fuse is bridged between the two pole brush holders through the circuit board, the opposite ends of the circuit board are fixedly supported through the body part and the supporting part in the two brush holders, the reliability of installation is good, the fuse is not in a suspended state, and no interference occurs between the two poles, so that the failure condition of the fuse when the motor is interfered can be effectively prevented, and the overload protection of the motor can be stably realized.

Claims

1. The utility model provides a brush motor rear end cap assembly which characterized in that: the novel electric wire harness comprises a rear end cover body (1) and a brush holder plate (2), wherein at least two brush holders (3) which are oppositely arranged are fixed on the brush holder plate (2), the brush holders (3) are made of metal with electric conduction performance, each brush holder (3) comprises a body part (4) and a supporting part (5) which are not contacted with each other, conduction is realized between the body part (4) and the supporting part (5) in the same brush holder (3) through an inductor (6), the body part (4) is electrically connected with an electric brush (8) in the brush holder through a first lead (7), a circuit board (10) with a fuse (9) is bridged between the two brush holders (3), a second lead (11) which is electrically connected with the circuit board (10) is led out, one end of the circuit board (10) and the body part (4) in one brush holder (3) form a non-conduction fixed support, a third lead (12) which is electrically connected with the supporting part (5) in the brush holder (3) is led out, and the other end of the circuit board (10) and the other end of the circuit board (10) form an integrated lead (12) in the lead-out part; the body part (4) is provided with a first vertical piece (14), the body part (4) is welded with the circuit board (10) through the first vertical piece (14) to form a non-conductive fixed support, the support part (5) is provided with a second vertical piece (15), and the support part (5) is welded with the circuit board (10) through the second vertical piece (15) to form a conductive fixed support.

2. The brush motor rear end cap assembly of claim 1, wherein: the body part (4) and the supporting part (5) are respectively provided with a first right-angle piece (16) and a second right-angle piece (17), one end of the inductor (6) is abutted against the first right-angle piece (16) and is welded and fixed with the first right-angle piece, and the other end of the inductor (6) is abutted against the second right-angle piece (17) and is welded and fixed with the second right-angle piece.

3. The brush motor rear end cap assembly of claim 2, wherein: the first right angle piece (16) and the second right angle piece (17) are positioned on two sides of the electric brush (8) which are transversely opposite, and the heights of the first right angle piece (16) and the second right angle piece (17) are flush and larger than the height of the body part (4) of the outer side part of the electric brush (8).

4. The brush motor rear end cap assembly of claim 2, wherein: the brush holder plate (2) is also fixedly provided with a torsion spring column (13) which is positioned at one side of the brush holder (3) and used for fixing a brush spring, and a reinforcing section (33) which extends into the interior of the torsion spring column (13) from the free end of the torsion spring column (17) and is fixedly connected with the torsion spring column is formed on the transverse section of the second right-angle member (17).

5. The brush motor rear end cap assembly of claim 1, wherein: the brush holder plate (2) is fixed in the inner of rear end cover body (1), brush holder plate (2) with rear end cover body (1) concentric setting, rear end cover body (1) center department is formed with inner open-ended bearing and places hole (18), bearing is placed hole (18) bottom and is fixed with wave washer (19), still be fixed with in bearing is placed hole (18) and is located bearing (20) of wave washer (19) axial one side, brush holder plate (2) with rear end cover body (1) contact one end's middle part is formed with follow the opening end of bearing is placed hole (18) stretches into extension (21) of its inside, the extension of extension (21) with the axial one end contact of bearing (20).

6. The brush motor rear end cap assembly of claim 5, wherein: the middle part of the extending end of the extending part (21) is provided with a round yielding hole (22) with an opening, and the diameter of the section of the yielding hole (22) is larger than the inner diameter of the outer ring of the bearing (20).

7. The brush motor rear end cap assembly of claim 6, wherein: the brush holder plate (2) is characterized in that a through hole (23) penetrating through the inner end and the outer end of the brush holder plate is formed in the center of the brush holder plate (2), the through hole (23) comprises a small-diameter portion (24) which is communicated with the yielding hole (22) to enable a power supply motor to pass through, and a large-diameter portion (25) which is positioned on one side of the small-diameter portion (24) and used for enabling a commutator to rotate, and an annular end face (26) is formed at the joint of the small-diameter portion (24) and the large-diameter portion (25).

8. The brush motor rear end cap assembly of claim 5, wherein: the novel motor shaft outlet structure is characterized in that a sealing hole (27) communicated with the bearing placing hole (18) is formed in the center of the rear end cover body (1), the aperture of the sealing hole (27) is smaller than that of the bearing placing hole (18), a shaft hole (28) for a motor shaft to pass through is formed in the sealing hole (27) in a way of being far away from one end of the bearing placing hole (18), and at least two sealing rings (29) for sealing the motor shaft are arranged in the sealing hole (27) in a superposition mode.

9. The brush motor rear end cap assembly of claim 1, wherein: the novel brush holder body is characterized in that a sealing groove (30) is formed in one side of the outer end of the rear end cover body (1), the sealing groove (30) is filled with solidified sealant, two wiring holes (31) which are arranged at intervals are formed in the side wall of the brush holder plate (2) close to the sealing groove (30), a protective coil (32) is fixed to the outer side of the periphery of the sealing groove (30), and a second lead (11) and a third lead (12) penetrate through the corresponding wiring holes (31) to extend into the sealing groove (30) and penetrate through the protective coil (32) to extend to the outer side of the motor.