CN114530967A

CN114530967A - Rear end cover assembly of brush motor

Info

Publication number: CN114530967A
Application number: CN202210069149.XA
Authority: CN
Inventors: 杜姗; 金永波; 马万琪; 余健
Original assignee: Dongyang Linix Machine Electricity Co Ltd
Current assignee: Zhejiang Linix Motor Co Ltd
Priority date: 2022-01-21
Filing date: 2022-01-21
Publication date: 2022-05-24
Anticipated expiration: 2042-01-21
Also published as: CN114530967B

Abstract

The invention relates to a rear end cover assembly of a brush motor, 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 in contact with each other, the body part and the supporting part in the same brush frame are conducted through inductance, 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 which is electrically connected with the circuit board is led out of the circuit board, and one end of the circuit board forms a non-conductive fixed support with the body part in one brush frame. The fuse wire is bridged between the two pole brush holders through the circuit board, and the fuse wire is not in a suspended state, so that the failure condition of the fuse wire when the motor is interfered can be effectively prevented.

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 that the motor coil is burnt due to overload often occurs. At present, the prevention method is mainly characterized in that an external fuse fuses with the self temperature change to cut off current, and then a circuit is cut off before a motor fires, so that the fire danger caused by motor overload is prevented.

Current chinese patent No. 201820686975.8, the patent name is a patent of novel car fusing technology brush yoke, including the brush yoke support body, install the rotor in the middle of the upper surface of brush yoke support body, the edge week of rotor is even installs four and is radial carbon brushes, 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 the mode that the resistance welded, one side of brush yoke support body is fixed with integrated connector through the mode that the resistance welded, the position that the inside of brush yoke support body and integrated connector correspond has the condenser through the mode welding of resistance welding. The electric brush holder has the advantages that all electric appliance elements are completely fixed on the metal sheet of the brush holder plate through the resistance welding technology, welding seams are compact, the defects of looseness, cracks and the like do not exist, and a good electric loop can be formed between the elements and the brush holder, so that stable brush holder performance is obtained. It also has the following disadvantages: the fuse lug connects can make the fuse be in unsettled state on the brush yoke always, and the reliability of installation is poor for the fuse condition of inefficacy appears easily when the motor receives the interference, is difficult to the overload protection scheduling problem of stable realization motor.

Disclosure of Invention

The invention aims to provide a rear end cover assembly of a brush motor, which solves the problems that in the prior art, a fuse is directly connected to a 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, the overload protection of the motor is difficult to stably realize, and the like.

The technical purpose of the invention is mainly solved by the following technical scheme: a brush motor rear end cover assembly comprises a rear end cover body and a brush frame plate, wherein at least two brush frames which are oppositely arranged are fixed on the brush frame plate, the brush holder is made of metal with conductive performance, the brush holder comprises a body part and a supporting part which are not in contact with each other, the body part and the supporting part in the same brush holder are conducted through inductance, the body part is electrically connected with the electric brush inside the body part through a first lead wire, a circuit board with a fuse is bridged between the two brush holders, a second lead wire electrically connected with the circuit board is led out from the circuit board, one end of the circuit board and the body part in one of the brush holders form a non-conductive fixed support, and a third lead wire electrically connected with the support part is led out from the support part in the brush holder, the other end of the circuit board and the support part in the other brush holder form a conductive fixed support, and the parts led out by the second lead wire and the third lead wire are integrated to form a lead-out wire harness.

When the device is used, the second lead wire is conducted with the fuse wire on the circuit board, the fuse wire on the circuit board is conducted with the electric brush in one brush holder through the inductor and the first lead wire, in addition, the third lead wire is conducted with the electric brush in the other brush holder through the inductor, the motor circuit is conducted through the lead-out wire harness formed by the second lead wire and the third lead wire, when the motor is overloaded, the fuse wire is fused through the temperature change of the fuse wire, so that the motor circuit is in a broken circuit state, the circuit is cut off before the motor is ignited, and the ignition danger caused by the overload of the motor is prevented. And then can be stable the realization motor overload protection.

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

Through being formed with first vertical component on this somatic part, this somatic part forms non-conductive fixed bolster through first vertical component and circuit board welding, be formed with the second vertical component on the supporting part, the supporting part forms the fixed bolster that switches on through second vertical component and circuit board welding, through first vertical component, the fixed mounting of second vertical component and circuit board both ends welding in order to realize the circuit board, and can carry out stabilizing support to the circuit board, the good reliability of installation, in addition can realize through switching on of second vertical component and circuit board that the brush in circuit board and one of them brush yoke switches on, switch on in order to realize motor circuit.

Preferably, the body portion and the support portion are further respectively formed with a first right-angle member and a second right-angle member, one end of the inductor abuts against the first right-angle member and is welded and fixed with the first right-angle member, and the other end of the inductor abuts 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 spare and second right angle spare on this somatic part and supporting part respectively, inductance one end supports and leans on first right angle spare and forms welded fastening rather than, and the inductance other end supports and leans on and forms welded fastening rather than on the second right angle spare, through first right angle spare, second right angle spare and inductance both ends welding in order to realize the fixed mounting of inductance to make can realize switching on between brush yoke and the brush after the inductance installation.

Preferably, the first right-angle member and the second right-angle member are positioned on two opposite sides of the brush in the transverse direction, and the height of the first right-angle member and the height of the second right-angle member are flush and larger than the height of the outer part body part of the brush.

Through setting up first right angle spare and second right angle spare in the horizontal relative 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, make the inductance can fixed mounting directly over the brush, make inductance and brush can follow vertical range upon range of setting, can save the inductance and occupy the horizontal space of brush yoke board, thereby can arrange each component more rationally in limited space, it is also safer with the installation to walk the line simultaneously.

Preferably, the brush holder plate is further fixed with a torsion spring column which is positioned on one side of the brush holder and used for fixing the brush spring, and the transverse section of the second right-angle member is provided with a reinforcing section which extends into the second right-angle member from the free end of the torsion spring column and is fixedly connected with the torsion spring column.

Through still being fixed with the torsion spring post that is located brush yoke one side and is used for the fixed brush spring on the brush yoke plate, the horizontal section of second right angle spare is formed with the free end from the torsion spring post and stretches into its inside and rather than forming fixed connection's enhancement section for the torsion spring post can carry out the fixed stay to the horizontal section of second right angle spare, can further strengthen the supporting role of second right angle spare, 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 placing 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 placing hole, a bearing located on one axial side of the wave washer is further fixed in the bearing placing hole, an extending portion extending into the brush holder plate from the opening end of the bearing placing hole is formed in the middle of one end of the brush holder plate, which is in contact with the rear end cover body, and the extending end of the extending portion is in contact with one axial end of the bearing.

Through being fixed in the inner of rear end housing body with the brush yoke board, the brush yoke board sets up with the rear end housing body is concentric, rear end housing body center department is formed with the hole is placed to inner open-ended bearing, the hole bottom is placed to the bearing is fixed with the wave form packing ring, the downthehole bearing that is located wave form packing ring axial one side is placed to the bearing, the brush yoke board is formed with the extension that stretches into its inside from the open end in bearing placement hole with the middle part of rear end housing body contact one end, the extension end of extension and the axial one end contact of bearing, make can realize spacing the axial of bearing through the extension, can prevent that the bearing from upwards interfering because of wave form packing ring self elasticity and lead to the bearing skew, in order to realize the effective fixed to the bearing.

Preferably, the middle part of the extending end of the extending part is provided with an opening at the end and a round abdicating hole, and the section diameter of the abdicating hole is larger than the inner diameter of the bearing outer ring.

The end opening is formed in the middle of the extending end of the extending portion and is a circular yielding hole, 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 only presses the outer ring of the bearing, and the inner ring of the bearing cannot be pressed.

Preferably, the brush holder plate is provided with a through hole penetrating through the inner end and the outer end of the brush holder plate at the center, the through hole comprises a small diameter part communicated with the abdicating hole to allow an output shaft of the motor to penetrate through and a large diameter part positioned on one side of the small diameter part to allow 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 be formed with the perforation that runs through its inside and outside both ends in brush yoke board center department, the perforation includes with the hole intercommunication of stepping down with the power supply machine play axle the small diameter portion that passes and be located small diameter portion one side in order to supply commutator pivoted major diameter portion, the linking department of small diameter portion and major diameter portion is formed with an annular terminal surface, make 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 long-time running carbon dust 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 through which a motor output shaft passes, and at least two sealing rings used for sealing the motor output shaft are arranged in the sealing hole in an overlapping mode.

Through being formed with in rear end cap body center department and placing the sealed hole of hole intercommunication with the bearing, the aperture of sealed hole is less than the aperture that the hole was placed to the bearing, the one end intercommunication that the hole was placed to the bearing was kept away from to the sealed hole is equipped with the shaft hole that the power supply machine goes out the axle and passes, it is equipped with at least two sealing washers that are used for going out the axle to seal to the motor to add in the sealed hole, make sealed hole and bearing place linking department between the hole can form a step in order to carry on spacingly to the ripple packing ring, and can effectively seal the play axle of motor through the sealing washer of two range upon range of settings, sealed 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, the sealing groove is close to a wire passing hole formed in the side wall of the brush holder plate at two intervals, a protective coil is fixed to the outer side of the circumferential direction of the sealing groove, and the second lead and the third lead penetrate through the corresponding wire passing holes to extend into the sealing groove and penetrate through the protective coil to extend to the outer side of the motor.

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

Therefore, the fuse wire is bridged between the two brush holders through the circuit board, the two opposite ends of the circuit board are fixedly supported through the body parts and the supporting parts in the two brush holders, the installation reliability is good, the fuse wire cannot be in a suspended state, and the two poles cannot be interfered with each other, so that the failure condition of the fuse wire when the motor is interfered can be effectively prevented, and the 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 structural view of the present invention;

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

The scores in the figures 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 portion; 6. an inductance; 7. a first lead; 8. an electric brush; 9. a fuse; 10. a circuit board; 11. a second lead; 12. a third lead; 13. a torsion spring post; 14. a first vertical member; 15. a second vertical member; 16. a first right angle member; 17. a second right angle member; 18. a bearing placement hole; 19. a wave washer; 20. a bearing; 21. an extension portion; 22. a hole of abdication; 23. perforating; 24. a small diameter part; 25. a large diameter portion; 26. an annular end face; 27. sealing the hole; 28. a shaft hole; 29. a seal ring; 30. a sealing groove; 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 by the following embodiments and the accompanying drawings.

As shown in fig. 1 and 2, the brush motor rear end cover assembly according to the present invention includes a rear end cover body 1 and a brush holder plate 2, at least two brush holders 3 disposed opposite to each other are fixed on the brush holder plate 2, the brush holders 3 are made of metal having electrical conductivity, each brush holder 3 includes a body portion 4 and a support portion 5 that are not in contact with each other, the body portion 4 is electrically connected to a brush 8 inside thereof through a first lead 7, the body portion 4 and the support portion 5 in the same brush holder 3 are electrically connected through an inductor 6, the body portion 4 and the support portion 5 are further respectively formed with a first right-angle member 16 and a second right-angle member 17, the first right-angle member 16 and the second right-angle member 17 are both L-shaped, one end of the inductor 6 abuts against the first right-angle member 16 and forms a welding fixation therewith, the other end of the inductor 6 abuts against the second right-angle member 17 and forms a welding fixation therewith, and is welded thereto, the first right-angle component 16 and the second right-angle component 17 are positioned at two opposite sides of the brush 8 in the transverse direction, the heights of the first right-angle component 16 and the second right-angle component 17 are flush and larger than the height of the body part 4 of the outer part of the brush 8, a torsion spring column 13 which is positioned at one side of the brush holder 3 and used for fixing a brush spring is further fixed on the brush holder plate 2, the brush spring is sleeved on the torsion spring column 13, and a reinforcing section 33 which extends into the second right-angle component 17 from the free end of the torsion spring column 13 and is fixedly connected with the torsion spring column is formed at the transverse section of the second right-angle component 17.

As shown in fig. 1 and fig. 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 the body portion 4 in one of the brush holders 3, a first vertical member 14 is formed on the body portion 4, the body portion 4 is welded with the circuit board 10 through the first vertical member 14 to form a non-conductive fixed support, the fixed support is welded in a soldering manner, and a third lead 12 electrically connected with the support part 5 in the brush holder 3 is led out from the support part 5, the other end of the circuit board 10 and the support part 5 in the other brush holder 3 form a conductive fixed support, a second vertical piece 15 is formed on the support part 5, the support part 5 and the circuit board 10 are welded through the second vertical piece 15 to form a conductive fixed support, the second lead 11 and the third lead 12 are soldered to each other by soldering, and the portions led out 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 through screws, the brush holder plate 2 is concentrically arranged with the rear end cover body 1, a bearing placing hole 18 with an inner end opening 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 axial side of the wave washer 19 is further fixed in the bearing placing hole 18, an extending part 21 extending into the brush holder plate 2 from the opening end of the bearing placing hole 18 is formed at the middle part of the end of the brush holder plate 2 contacting with the rear end cover body 1, the extending end of the extending part 21 contacts with one axial end of the bearing 20, a round abdicating hole 22 is formed at the middle part of the extending end of the extending part 21, the cross-section diameter of the abdicating hole 22 is larger than the inner diameter of the outer ring of the bearing 20, a through hole 23 penetrating through the brush holder plate 2 at the center, the through hole 23 comprises a small diameter part 24 communicated with the abdicating hole 22 for the motor to pass through and a large diameter part 25 positioned on one side of the small diameter part 24 for the commutator to rotate, an annular end surface 26 is formed at the joint of the small diameter part 24 and the large diameter part 25, and the section diameter of the small diameter part 24 is larger than the inner diameter of the inner ring of the bearing 20.

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, one end of the sealing hole 27, which is far away from the bearing placing hole 18, is communicated with a shaft hole 28 through which a motor output shaft passes, at least two sealing rings 29 for sealing the motor output shaft are stacked 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, a cured sealant is filled in the sealing groove 30, the sealant is an epoxy resin potting material, two wire feeding holes 31 arranged at intervals are formed in the side wall of the sealing groove 30, a protective coil 32 is fixed on the circumferential outer side of the sealing groove 30, and the second lead 11 and the third lead 12 pass through the corresponding wire feeding holes 31 and extend into the sealing groove 30 and pass through the protective coil 32 to extend to the outer side of the motor.

In the specific implementation of this embodiment, the second lead 11 is conducted with the fuse 9 on the circuit board 20, the fuse 9 on the circuit board 20 is conducted with the brush 8 in one of the brush holders 3 through the inductor 6 and the first lead 7, the third lead 12 is conducted with the brush 8 in the other brush holder 3 through the inductor 6, the motor circuit is conducted through the lead-out harness formed by the second lead 11 and the third lead 12, the fuse 9 is fused through the temperature change of the fuse 9 when the motor is overloaded, so that the motor circuit is in an open circuit state, carbon powder generated after the brush 8 is worn during the operation process can be stored at the annular end face 26 to leave a certain storage space, wherein the fuse 9 is bridged between the two pole brush holders 3 through the circuit board 10, and the fixed installation of the circuit board 10 is realized by welding the first vertical member 14 in the body portion 4 and the two opposite ends of the circuit board 10 through the second vertical member 15 in the support portion 5, the fuse 9 is connected to the circuit board 10, so that the fuse 9 is fixedly mounted, and the inductor 6 is fixedly mounted by welding the first right-angle piece 16 in the body part 4 and the second right-angle piece 17 in the supporting part 5 with two ends of the inductor 6.

The fuse wire is bridged between the two brush holders through the circuit board, the two opposite ends of the circuit board are fixedly supported through the body parts and the supporting parts in the two brush holders, the installation reliability is good, the fuse wire is not in a suspended state, and the two poles are not interfered with each other, so that the failure condition of the fuse wire 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 brush holder 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, the brush holders (3) comprise a body part (4) and a supporting part (5) which are not in contact 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 body part through a first lead (7), a circuit board (10) with a fuse wire (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, and a non-conduction fixed support is formed between one end of the circuit board (10) and the body part (4) in one brush holder (3), and a third lead (12) electrically connected with the support part (5) in the brush holder (3) is led out, the other end of the circuit board (10) and the support part (5) in the other brush holder (3) form a conductive fixed support, and the parts led out by the second lead (11) and the third lead (12) are integrated to form a lead-out wire harness.

2. The brushed motor rear end cap assembly of claim 1, wherein: the circuit board fixing support is characterized in that 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 fixing support, a second vertical part (15) is formed on the support part (5), and the support part (5) is welded with the circuit board (10) through the second vertical part (15) to form a conductive fixing support.

3. A brushed motor rear end cap assembly as claimed in claim 1 or 2, wherein: the body part (4) and the support 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) abuts 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) abuts against the second right-angle piece (17) and is welded and fixed with the second right-angle piece.

4. The brushed motor rear end cap assembly of claim 3, wherein: the first right-angle piece (16) and the second right-angle piece (17) are positioned on two sides of the electric brush (8) in the transverse direction, and the heights of the first right-angle piece (16) and the second right-angle piece (17) are flush and are greater than the height of the outer part body part (4) of the electric brush (8).

5. The brushed motor rear end cap assembly of claim 3, wherein: the brush holder plate (2) is further fixed with a torsion spring column (13) which is located on one side of the brush holder (3) and used for fixing a brush spring, and a reinforcing section (33) which extends into the second right-angle piece (17) from the free end of the torsion spring column (13) and is fixedly connected with the second right-angle piece is formed in the transverse section of the second right-angle piece.

6. A brushed motor rear end cap assembly as claimed in claim 1 or 2, wherein: the brush holder plate (2) is fixed in the inner end of rear end cover body (1), brush holder plate (2) with rear end cover body (1) sets up with one heart, 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 form packing ring (19), still be fixed with in the bearing is placed hole (18) and is located wave form packing ring (19) axial one side bearing (20), brush holder plate (2) with the middle part of rear end cover body (1) contact one end is formed with the follow the open end that hole (18) was placed to the bearing stretches into its inside extension (21), the extension of extension (21) with the axial one end contact of bearing (20).

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

8. The brushed motor rear end cap assembly of claim 7, wherein: brush yoke board (2) center department is formed with perforation (23) that runs through its inside and outside both ends, perforation (23) include with abdicating hole (22) intercommunication with power machine play axle pass small diameter portion (24) and being located small diameter portion (24) one side is in order to supply commutator pivoted major diameter portion (25), the department of linking of small diameter portion (24) and major diameter portion (25) is formed with an annular terminal surface (26).

9. The brushed motor rear end cap assembly of claim 6, wherein: the rear end cover comprises a rear end cover body (1), wherein a sealing hole (27) communicated with a 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), one end, far away from the bearing placing hole (18), of the sealing hole (27) is communicated with a shaft hole (28) through which a motor output shaft passes, and at least two sealing rings (29) used for sealing the motor output shaft are arranged in the sealing hole (27) in a superposed mode.

10. A brushed motor rear end cap assembly as claimed in claim 1 or 2, wherein: rear end cap body (1) outer end one side is formed with seal groove (30), seal groove (30) intussuseption is filled with the sealed glue after the solidification, seal groove (30) are close to the lateral wall of brush yoke plate (2) is formed with walk line hole (31) that two intervals set up, the circumference outside of seal groove (30) is fixed with protective coil (32), second lead wire (11) and third lead wire (12) pass corresponding walk line hole (31) and stretch into in seal groove (30) and pass protective coil (32) and extend to the motor outside.