JPS6360630B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a small motor.

Conventionally, a small motor has a cylindrical case 1 with a bottom, as shown in FIG. 1, and the bottom 2 of the case 1 has a recess 3 projecting outward. Reference numeral 4 denotes a brush holder made of synthetic resin, which is attached to a hole 5 formed in the recess 3 of the case 1, and whose bottom surface 4a
is a thrust bearing.

A permanent magnet 6 is attached to the bottom 2 of the case 1 by adhesive or the like. 7 is a brush made of a phosphor bronze plate or the like, and 8 is a lead wire, which is provided in the brush holder 4. Reference numeral 9 denotes a cover made of a metal plate that closes the open end of the case 1, and is attached to the case 1 by fitting the cover 9 or the like. 10 is a bearing provided in the cover 9; 11 is a rotor made of synthetic resin in which a plurality of coils 12 are embedded; 13 is a rotor 1;
This is a magnetic plate provided by adhesive or the like on the surface facing the permanent magnet 6 of No. 1. 14 is an electrode plate provided on the rotor 11, and 15 is a rotating shaft rotatably provided on the bearing 10, to which the rotor 11 is attached. 16 is a commutator attached to the rotating shaft 15, and this commutator 1
One end of a coil 12 is connected to 6 via an electrode plate 13.

However, in the above-described structure, the case 1 is assembled by fitting the cover 9 into which the rotary shaft 15 is inserted, or by fitting the cover 9 after the cover 9 is inserted into the case 1.

Therefore, the process of attaching the lead wires is time-consuming, the brushes must be careful not to be damaged when inserting the rotary shaft 15, and each part cannot be assembled by sequentially overlapping each other, making automation difficult. It was hot.

Therefore, the present invention has been made to address the above-mentioned drawbacks and provides a small motor that is easy to assemble and can be easily automated.

Next, one embodiment of the present invention will be described in detail with reference to FIG. 2 and the following drawings.

In the figure, reference numeral 20 denotes a case, and the case 20 has a bottomed cylindrical shape with a substantially U-shaped cross section, and a bottom portion 21 of the case 20 has a center portion protruding slightly outward and a hole 22 formed in the center portion. Furthermore, deep notches 23, 23, 23 are formed at approximately 120 degree intervals in the open end of the case 20, and a shallow notch 24 is formed at one location. Further, a recessed step portion 25 is formed on the inner peripheral edge of the open end of the case 20. 26 is hole 2
This is a bearing fitted in 2. 27 is a rotor, and this rotor 27 includes a plurality of coils 28 . . . , a ring-shaped electrode plate 29, and a magnetic plate 30, which are integrally fixed to a disk shape of a rotating shaft 32 by synthetic resin 31. This rotor 27 is formed with a bend near the rotating shaft 32, bends the coil 28, leads out the terminal wire 28a of the coil 28 into this recess, and secures a sufficient width of the permanent magnet described later to generate magnetic flux for generating rotational force. All the straight parts of the coil 28 that intersect at right angles are utilized. A recess 33 is formed in this rotary shaft 32 and filled with synthetic resin 31 to prevent rotation and removal. In addition, the rotating shaft 32 inside the case 20
A commutator 34 is provided at the end of the rotor 27 (at a position where the bearing 26 is sandwiched between the rotor 27). Terminal wires 34a and 28a of the commutator 34 and the coil 28 are connected to an electrode plate 29. A permanent magnet 35 is formed into a ring shape, is fixed to a support member 36, and is disposed near the coil 28. This support member 36 is formed into a disk shape, and has a hole formed in its center into which the rotating shaft 32 is inserted, and protrusions 37, 37 on the periphery corresponding to the deep notches 23, 23, 23. , 37 are extended and fitted and held. The permanent magnet 35 is magnetized with the protrusion 37 as a reference. 38 is a cover, and this cover 38 is formed in a disk shape and is attached to the case 2.
A terminal portion 39 that fits into the recessed step portion 25 of No. 0 and protrudes to the outside is integrally formed. Further, the inside of the cover 38 is coated with an insulating material (not shown), and a circuit 40 is printed on this insulating material. 41 is a brush, this brush 4
1 is fixedly installed inside the cover 38 at one end, and its free end is brought into contact with the commutator 34.

As shown in FIG. 4, two brushes 41 are fixed to bent pieces 43, 43 at both ends of a substantially L-shaped terminal plate 42, and are arranged orthogonally. A damper 44 is attached to this brush 41.
After fixing this terminal plate 42 to the cover 38 by soldering, the dotted line 46 portion is removed and a pair of brushes 41,
There are 41. Reference numeral 47 is a synthetic resin thrust bearing against which the end of the rotating shaft 32 is abutted. 48
is a holding member that holds the support member 36 in a predetermined position. 49 is an inter-brush noise absorbing capacitor provided in the circuit 40. 50 is a lead wire connected to the terminal portion 39.

The present invention is constructed as described above, and the method of assembling the same is explained by inserting the rotating shaft 32, on which the rotor 27, commutator 34, etc. are fixed, into the bearing 26 of the case 20, and then inserting the permanent magnet 35 on the rotor 27 side. The supporting member 36 is facing toward the case 2, and its projecting piece 37 is
After that, the cover 38 with the brush 41, thrust bearing 47, etc. attached is fitted into the recessed step 25 of the case 20, and the number of open ends of the case 20 is adjusted. Tighten the holes to secure the cover 38.

Note that the formation of the rotor 27 and the rotating shaft 32 is not limited to the above-mentioned embodiment, and the coil 28 may be embedded in a synthetic resin 31 to form a ring-shaped rotor.
Thereafter, the rotor, electrode plates, and magnetic plates are fixed at predetermined positions on the rotating shaft by filling synthetic resin through the holes in the magnetic plates to fix the rotor, electrode plates, magnetic plates, and rotating shaft.

The present invention is constructed as described above, and includes a case having a bottomed cylindrical shape with a substantially U-shaped cross section and equipped with a bearing at the bottom, a rotor housed in the case, which is fixed near the bearing, and a commutator. a rotating shaft supported by the bearing, and a permanent magnet fixedly disposed adjacent to the rotor, and a permanent magnet fixedly attached to the supporting member fitted to the case and the permanent magnet fixedly attached to the rotor. A magnetic plate that is fitted into the case, a brush that contacts the commutator inside, a thrust bearing that the end of the rotating shaft comes into contact with, and a printed circuit that is led out to the outside. , the process of pulling out the lead wires from the case is eliminated, and the rotating shaft with rotor, supporting member,
Finally, the cover can be fitted and assembled, which simplifies assembly and facilitates automation.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a conventional small motor, Fig. 2 and the following show an embodiment of the present invention, Fig. 2 is a longitudinal sectional view, Fig. 3 is an exploded perspective view immediately before assembly, and Fig. 4 is an exploded perspective view of the motor. FIG. 3 is a plan view of the terminal board before attachment. 20...Case, 21...Bottom, 23...Deep notch, 24...Shallow notch, 25...Concave step,
26... Bearing, 27... Rotor, 28... Coil, 29... Electrode plate, 30... Magnetic plate, 31...
Synthetic resin, 32... Rotating shaft, 34... Commutator, 3
5... Permanent magnet, 36... Supporting member, 37... Projection, 38... Cover, 40... Circuit, 41... Brush, 47... Thrust bearing.

Claims (1)

[Claims] 1. A case having a bottomed cylindrical shape with a substantially U-shaped cross section and having a bearing at the bottom, a rotor housed in the case being fixed near the bearing, and having a commutator and being supported by the bearing. a rotating shaft having a permanent magnet fixedly disposed adjacent to the rotor, a support member fitted to the case, a magnetic plate fixedly attached to the rotor and attracted to the permanent magnet, and the case. and a cover that is fitted into the commutator and has a brush on the inside that contacts the commutator, a thrust bearing that contacts the end of the rotating shaft, and a printed circuit that is led out to the outside. A small motor.