Mini-lathe motor

Abstract

The utility model discloses a motor for mini lathe, include: shell, shell rear end port is installed with wiring board, and the rear end cover is covered on the wiring board, and the wiring board left and right sides are equipped with carbon brush holder respectively, and the shell rear end port left and right sides are equipped with the clamping gap respectively, and two carbon brush holders are clamped in two clamping gaps from back to front respectively, and two carbon brush holders are equipped with capacitor bin and carbon brush bin respectively, and two copper sleeves are respectively inserted in two carbon brush bins, and two carbon brushes are respectively inserted in the corresponding copper sleeve and contact with the commutator, and two capacitors are placed in two capacitor bins respectively, and two carbon brush holders are equipped with the replacement opening for replacing capacitor and carbon brush respectively, and two replacement openings are equipped with the apron respectively. The motor structure for mini lathe is compact, and the position of capacitor bin is optimized, so that the capacitor can be replaced when replacing the carbon brush, and the maintenance of the motor is more convenient.

Description

Technical Field

[0001] This utility model relates to the field of motors for power tools, specifically to a motor for a mini lathe. Background Technology

[0002] There is a mini lathe that requires a compact motor with easily replaceable carbon brushes to drive the spindle. In order to eliminate EMC electromagnetic interference, a capacitor needs to be installed in the motor. However, it is inconvenient to replace the carbon brushes and capacitors in existing motors. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a compact motor for mini lathes that allows for easy replacement of carbon brushes and capacitors.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows: a motor for a mini lathe, comprising: a cylindrical metal housing, a front end cover installed on the front end of the housing, a rear end cover installed on the rear end of the housing, an armature shaft coaxially mounted in the housing, the two ends of the armature shaft being respectively mounted to the two end covers via bearings, allowing the armature shaft to rotate within the housing, an armature core, an armature rear end plate, an armature front end plate, a fan blade, and a commutator mounted on the armature shaft, copper wire wound around the armature core to form the armature, magnets installed in the housing on both sides of the armature core, the armature core being located between the armature rear end plate and the armature front end plate, the fan blade being located between the commutator and the armature rear end plate, and the end of the armature being connected to the commutator, characterized in that: a wiring board is installed at the rear port of the housing, the rear end cover is placed on the wiring board, a carbon brush holder is provided on the left and right sides of the wiring board, and a snap-fit ​​notch is provided on the left and right sides of the rear port of the housing. Two carbon brush holders are respectively snapped into two mounting notches from back to front. Each carbon brush holder has a capacitor compartment and a carbon brush compartment that communicates with the inner cavity of the outer casing. The capacitor compartment is located between the rear cover and the carbon brush compartment. Copper sleeves are inserted into each of the two carbon brush compartments. The two carbon brushes are inserted into the corresponding copper sleeves and contact the commutator. Two capacitors are placed in the two capacitor compartments. One wire of each capacitor is soldered to the copper plate on the corresponding carbon brush. The other wire of each capacitor passes through a wire groove on the rear surface of the wiring board and connects to the outer casing. The rear cover has a wire hole through which the power supply wire passes. Then, the positive and negative wires of the wire pass through a wire groove on the rear surface of the wiring board and extend to the two capacitor compartments. Then, the positive and negative wires of the wire are connected to the copper plates of the two carbon brushes. Both carbon brush holders have replacement ports for replacing capacitors and carbon brushes. Each replacement port has a removable cover plate.

[0005] Furthermore, in the aforementioned motor for a mini lathe, the cover plate has the following mounting structure: a retaining edge is provided on each of the left and right sides of the replacement port; a U-shaped groove is provided on each of the left and right sides of the cover plate; a retaining edge is provided on each of the left and right sides of the front part of the replacement port; a spring is provided in the middle of the cover plate, with only the inner end of the spring connected to the cover plate, making the spring elastic; a backstop edge is provided on the lower part of the outer end of the spring; and ramp sections are provided on each of the left and right sides of the rear part of the replacement port. When the cover plate is inserted into the replacement port from back to front, the two retaining edges will respectively engage with the two U-shaped grooves, and the backstop edge will abut against the two ramp sections. As it is inserted, the backstop edge will be lifted by the two ramp sections. When the left and right sides of the cover plate abut against the two retaining edges, the backstop edge will move away from the two ramp sections and return to its original position. At this time, the two ramp sections can block the outside of the backstop edge and prevent the cover plate from separating from the replacement port.

[0006] Furthermore, in the aforementioned mini lathe motor, the mounting structure of the two end caps is as follows: a connecting shaft arranged along the axial direction of the housing is fixed on the upper and lower sides of the outer wall of the housing, and internal thread holes are provided on both ends of the connecting shaft. The rear end cap is screwed into the internal thread holes of the rear ends of the two connecting shafts by two screws passing through its two sides, and is sealed on the rear end of the housing by two screws passing through its two sides, and is sealed on the front end of the housing by two screws passing through its two sides, and is screwed into the internal thread holes of the front ends of the two connecting shafts.

[0007] Furthermore, in the aforementioned motor for a mini lathe, a locking block is provided on the upper and lower sides of the wiring board, and a slot for the locking block to be engaged is provided on the upper and lower sides of the rear port of the housing.

[0008] Furthermore, in the aforementioned motor for a mini lathe, two limiting posts are provided on the outer end face of the wiring board, and the wire is limited by the two limiting posts before passing through the rear end cover. The rear end cover is provided with holes to allow the two limiting posts to pass through.

[0009] The advantages of this utility model are: the motor for the mini lathe has a compact structure and the position of the capacitor compartment has been optimized, so that the capacitor can be replaced when the carbon brush is replaced, making the motor maintenance more convenient; the carbon brush compartment is usually closed by a screw cap, which requires unscrewing the cap to replace the brush, and the rotation of the cap is relatively troublesome, while the cover plate can be quickly disassembled and assembled, making the replacement of carbon brushes and capacitors faster. Attached Figure Description

[0010] Figure 1 This is a three-dimensional structural diagram of the motor for the mini lathe described in this utility model.

[0011] Figure 2 This is a side view of the motor for the mini lathe described in this utility model.

[0012] Figure 3for Figure 2 Sectional view of AA.

[0013] Figure 4 for Figure 2 BB section view.

[0014] Figure 5 This is a structural diagram of the wiring board and brush holder.

[0015] Figure 6 This is a schematic diagram of the outer shell.

[0016] Figure 7 This is a schematic diagram of the cover plate. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0018] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, a motor for a miniature lathe includes: a cylindrical metal housing 1, a front end cover 2 mounted on the front end of the housing 1, a rear end cover 3 mounted on the rear end of the housing 1, an armature shaft 4 coaxially mounted within the housing 1, and the two ends of the armature shaft 4 respectively mounted to the two end covers via bearings, allowing the armature shaft 4 to rotate within the housing 1. An armature core 5, an armature rear end plate 6, an armature front end plate 7, a fan blade 8, and a commutator 9 are mounted on the armature shaft 4. Copper wire is wound around the armature core 5 to form the armature. Magnets 10 are installed in the outer casings 1 on both sides. The armature core 5 is located between the armature rear end plate 6 and the armature front end plate 7. The fan blade 8 is located between the commutator 9 and the armature rear end plate 6. The armature end is connected to the commutator 9. A cable tray 11 is installed at the rear port of the outer casing 1. The rear end cover 3 covers the cable tray 11. A carbon brush holder 12 is provided on the left and right sides of the cable tray 11. A mounting notch 13 is provided on the left and right sides of the rear port of the outer casing 1. The two carbon brush holders 12 are mounted from back to front into the two mounting notches. In section 13, each of the two carbon brush holders 12 is equipped with a capacitor compartment 14 and a carbon brush compartment 15 that communicates with the inner cavity of the outer casing 1. The capacitor compartment 14 is located between the rear end cover 3 and the carbon brush compartment 15. Copper sleeves 16 are inserted into each of the two carbon brush compartments 15, and two carbon brushes 17 are respectively inserted into the corresponding copper sleeves 16 and in contact with the commutator 9. Two capacitors 18 are respectively placed in the two capacitor compartments 14. One wire of each capacitor 18 is soldered to the copper plate on the corresponding carbon brush 17, and the other wire of each capacitor 18 is... The cable passes through a wire groove 19 on the rear end face of the cable tray 11 and connects to the outer casing 1. The rear end cover 3 is provided with a wire hole. The power supply wire 31 passes through the wire hole. Then, the positive and negative wires of the wire 31 pass through a wire groove 19 on the rear end face of the cable tray 11 and extend to the two capacitor compartments 14. Then, the positive and negative wires of the wire 31 are connected to the copper plates of the two carbon brushes 17 respectively. The two carbon brush holders 12 are provided with replacement ports for replacing the capacitors 18 and carbon brushes 17. The two replacement ports are provided with removable covers 20 respectively.

[0019] In this embodiment, the installation structure of the cover plate 20 is as follows: a retaining edge 21 is provided on the left and right sides of the replacement port; a U-shaped groove 22 is provided on the left and right sides of the cover plate 20; a retaining edge 23 is provided on the left and right sides of the front part of the replacement port; a spring piece 24 is provided in the middle of the cover plate 20, with only the inner end of the spring piece 24 connected to the cover plate 20, making the spring piece 24 elastic; a backstop edge 25 is provided on the lower part of the outer end of the spring piece 24; and inclined edges are provided on the left and right sides of the rear part of the replacement port. When the cover plate 20 is inserted from back to front onto the replacement port, the two retaining edges 21 will respectively engage with the two U-shaped grooves 22. The anti-reverse edge 25 will abut against the two ramp sections 26. As it is inserted, the anti-reverse edge 25 will be lifted by the two ramp sections 26. When the left and right sides of the cover plate 20 abut against the two retaining edges 23, the anti-reverse edge 25 will move away from the two ramp sections 26 and return to its original position. At this time, the two ramp sections 26 can block the outside of the anti-reverse edge 25 and prevent the cover plate 20 from separating from the replacement port.

[0020] The installation structure of the two end caps is as follows: a connecting shaft 27 arranged along the axial direction of the outer shell 1 is fixed on the upper and lower sides of the outer wall of the outer shell 1, and internal thread holes are provided on both ends of the connecting shaft 27. The rear end cap 3 is screwed into the internal thread holes of the rear end of the two connecting shafts 27 by two screws passing through its two sides, and is sealed on the rear end of the outer shell 1. The front end cap 2 is screwed into the internal thread holes of the front end of the two connecting shafts 27 by two screws passing through its two sides, and is sealed on the front end of the outer shell 1.

[0021] A locking block 28 is provided on the upper and lower sides of the wiring board 11, and a slot 29 for the locking block 28 to be inserted is provided on the upper and lower sides of the rear port of the outer casing 1.

[0022] Two limiting posts 30 are provided on the outer end face of the wiring board 11. The wire 31 is limited by the two limiting posts 30 before passing through the rear end cover 3. The rear end cover 3 is provided with holes to avoid the two limiting posts 30.

Claims

1. A motor for a mini lathe, including: A cylindrical metal casing has a front cover at the front end and a rear cover at the rear end. An armature shaft is coaxially mounted within the casing, with its two ends connected to the two end covers via bearings, allowing the armature shaft to rotate within the casing. The armature shaft houses an armature core, an armature rear end plate, an armature front end plate, a fan blade, and a commutator. Copper wire is wound around the armature core to form the armature. Magnets are installed in the casing on both sides of the armature core. The armature core is located between the armature rear end plate and the armature front end plate. The fan blade is located between the commutator and the armature rear end plate. The armature end is connected to the commutator. The casing is characterized by a wiring board installed at the rear port, with the rear cover covering the wiring board. A brush holder is located on each of the left and right sides of the wiring board. There are mounting notches on the left and right sides of the rear port, allowing the two brush holders to be mounted from back to front to two... In the mounting notch, each of the two brush holders has a capacitor compartment and a brush compartment that communicates with the inner cavity of the outer casing. The capacitor compartment is located between the rear cover and the brush compartment. Copper sleeves are inserted into each of the two brush compartments, and the two brushes are inserted into their corresponding copper sleeves and contact the commutator. Two capacitors are placed in the two capacitor compartments, and one wire of each capacitor is soldered to the copper plate on the corresponding brush. The other wire of each capacitor passes through a wire groove on the rear surface of the wiring board and connects to the outer casing. The rear cover has a wire hole through which the power supply wire passes. Then, the positive and negative wires of the wire pass through a wire groove on the rear surface of the wiring board and extend to the two capacitor compartments. Then, the positive and negative wires of the wire are connected to the copper plates of the two brushes. Each of the two brush holders has a replacement port for replacing the capacitors and brushes, and a removable cover is provided on each of the two replacement ports.

2. The motor for a mini lathe according to claim 1, characterized in that: The cover plate installation structure is as follows: a retaining edge is provided on the left and right sides of the replacement port, a U-shaped groove is provided on the left and right sides of the cover plate, a retaining edge is provided on the left and right sides of the front part of the replacement port, and a spring piece is provided in the middle of the cover plate. Only the inner end of the spring piece is connected to the cover plate, making the spring piece elastic. A backstop edge is provided on the lower part of the outer end of the spring piece. A ramp section is provided on the left and right sides of the rear part of the replacement port. When the cover plate is inserted into the replacement port from back to front, the two retaining edges will be engaged in the two U-shaped grooves respectively, and the backstop edge will abut against the two ramp sections. As it is inserted, the backstop edge will be lifted by the two ramp sections. When the left and right sides of the cover plate abut against the two retaining edges, the backstop edge will move away from the two ramp sections and return to its original position. At this time, the two ramp sections can block the outside of the backstop edge and prevent the cover plate from separating from the replacement port.

3. The motor for a mini lathe according to claim 1 or 2, characterized in that: The installation structure of the two end caps is as follows: a connecting shaft arranged along the axial direction of the outer shell is fixed on the upper and lower sides of the outer wall of the outer shell, and internal thread holes are provided on both ends of the connecting shaft. The rear end cap is screwed into the internal thread holes of the rear end of the two connecting shafts by two screws passing through its two sides to seal the rear end of the outer shell. The front end cap is screwed into the internal thread holes of the front end of the two connecting shafts by two screws passing through its two sides to seal the front end of the outer shell.

4. The motor for a mini lathe according to claim 1 or 2, characterized in that: A locking block is provided on the top and bottom sides of the wiring board, and a slot for the locking block to be inserted is provided on the top and bottom sides of the rear port of the outer casing.

5. The motor for a mini lathe according to claim 1 or 2, characterized in that: Two limiting posts are provided on the outer end face of the wiring board. The wires are limited by the two limiting posts before passing through the rear end cover. The rear end cover is provided with holes to avoid the two limiting posts.

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