JPH0214301Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a motor equipped with a brush holder made of synthetic resin.

A conventional motor brush holder is a bracket in which a plurality of screw holes 3 are formed in the stay part 2 of a brush holder 1 made of synthetic resin, and screw holes 4 that match the screw holes 3 are provided, as shown in FIG. 5 with screw 6
It was to be tightened and fixed.

However, with this structure, the attachment part of the brush holder 1 becomes hot due to external thermal influences, such as the heat generated by the engine or the heat generated by the motor itself, and the brush holder 1 made of synthetic resin cannot be tightened with the screw 6 due to this thermal influence. The fixed portion was deformed due to the creep phenomenon caused by heat, and the screws 6 became loosened, making it impossible to secure the parts sufficiently.

Also, attach the brush holder 1 to the bracket 5 with screw 6.
When tightening and fixing the bracket, the operator
The screw hole 4 of the brush holder 1 was aligned with the screw hole 3 of the brush holder 1 while tightening the screw 6 by hand, which was inefficient in terms of workability.

In order to eliminate the above-mentioned drawbacks, the present invention provides a motor in which the synthetic resin brush holder can be completely tightened and fixed, and the assembly workability can be improved.

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 2, reference numeral 8 denotes a brush holder integrally molded from synthetic resin, and FIG. 3 shows it from the back side. The inner diameter surface 9 of the brush holder 8 is a surface disposed at equal intervals around the commutator 11 of the rotor 10 of the motor shown in FIG.
Holder portions 13 and 13' are integrally molded so as to extend along the inner diameter surface thereof and face each other to hold at least a pair of negative electrode side brush 12 and positive electrode side brush 12'. The opposing surfaces and bottoms of the holder parts 13, 13' are open, and the upper parts are pigtails 14, 1 of the negative electrode side brush 12 and positive electrode side brush 12'.
U-shaped notches 15, 15' for passing the brushes 4' through are formed, and the inside has a box shape into which the negative brush 12 and the positive brush 12' are inserted. Also,
In the upper part of the holder parts 13, 13', pigtails 14, 14' are provided near the notches 15, 15' to prevent the pigtails 14, 14' from coming into contact with the rotor 10.
Projecting pieces 16, 16' are provided to prevent the movement of 14'. Further, an insulating wall 17 is formed along the outer periphery of the holder portion 13' that holds the positive electrode side brush 12' to insulate the pigtail 14' and the yoke 18.

Further, the stay part 19 of the brush holder 8 has holes 22 and 22' for tightening and fixing it to the bracket 20.
are formed, and around the holes 22, 22' are recesses 24, 2 for seating the dish-shaped elastic washers 23, 23' without shifting their positions.
4' is formed as an annular groove. Further, a bracket 2 is attached to the bottom of the brush holder 8 along the inner diameter surface 9 of the brush holder 8 as shown in FIG.
Ribs 26, 26 are formed to fit into the spigot part 25 of 0. Bosses 28, 28' are formed on the contact surface 27 where the bracket 20 contacts the brush holder 8.
Holes 29 and 29' are formed into which the parts 1 and 21' are screwed.

Moreover, the holder parts 13 and 13' of the brush holder 8
Grooves 30, 30' are provided in the abutment surface 27 of the bracket 20 where the brushes 12 and 12' are located to insulate the negative brush 12 and the positive brush 12' from the bracket 20.
are provided, and insulating plates 31, 31' made of baking material or the like are interposed in the grooves 30, 30' to connect the negative electrode side brush 12, the positive electrode side brush 12', and the bracket 20.
I am trying to insulate it from the

Next, the assembly of the brush holder of the present invention will be explained with reference to FIG. 2. First, attach the brush holder 8 to the bosses 28, 28' of the bracket 20 and the spigot part 25.
The holes 22, 22' and the ribs 26, 26 are aligned and assembled. Next, the recess 2 of the brush holder 8
4, 24', the brush terminal 32 of the negative electrode side brush 12 is placed on one of the elastic washers 23, and the screws 21, 24' are seated.
21' to tighten the elastic washer 2.
3 and 23' are fixed to the brush holder 8 in a constantly pressed state as shown in FIG.

The negative electrode side brush 12 and the positive electrode side brush 12' are the fifth
After inserting the springs 33, 33' into the holder parts 13, 13' of the assembly diagram shown in the figure,
The pigtails 14, 14' are assembled to the projections 16, 16' as shown in FIG. 5 so that their movement is prevented.

Although the brush holder of the present invention is fixed in this state, heat is generated when the motor rotates, and if the motor is installed close to an engine, etc., the motor may be affected by heat. Heat generation is unavoidable, and this heat causes deformation of the part pressed by the elastic washer of the synthetic resin brush holder, which sometimes causes the screws to loosen, but as detailed above, The brush holder of the motor according to the present invention is tightened with an elastic washer sandwiched between the boss portion formed on the bracket, and the brush holder is constantly pressed and fixed by the elastic washer, so even if the resin is slightly deformed due to heat. No screws will come loose. Further, since the boss of the bracket is inserted into the hole of the brush holder, the brush holder can be temporarily fixed on the bracket, improving work efficiency.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the conventional motor brush holder assembly structure, FIG. 2 is an explanatory diagram of the assembly of the motor brush holder according to the present invention, and FIG. 3 is a back view of the motor brush holder according to the present invention. FIG. 4 is a sectional structural view of the brush holder of the motor according to the present invention assembled, and FIG. 5 is a completed view of the brush holder of the motor according to the present invention assembled. Explanation of symbols: 1: brush holder, 2: stay part, 3: hole, 4: hole, 5: bracket, 6: screw, 7: negative electrode brush terminal, 8: brush holder,
9: Inner diameter surface, 10: Rotor, 11: Commitator,
12: Negative side brush, 12: Positive side brush, 1
3, 13': Holder part, 14, 14': Pigtail, 15, 15': U-shaped notch, 16, 1
6': Protruding piece, 17: Insulating wall, 18: Yoke, 1
9: Stay part, 20: Bracket, 21, 2
1': Screw, 22, 22': Hole, 23, 23': Elastic washer, 24, 24': Concave surface, 25: Spigot part, 26: Rib, 27: Contact surface, 28, 2
8': Boss, 29, 29': Hole, 30, 30': Groove,
31, 31': Insulating plate, 32: Brush terminal, 33,
33': Spring.

Claims (1)

[Scope of utility model registration request] Holder parts 13, 13' that accommodate at least a pair of brushes 12, 12';
The motor is equipped with a brush holder 8 integrally molded with resin and a stay part 19 connecting the brush holder 13', and a bracket 20 to which the brush holder 8 is fixed, and the bracket 20 has bosses 28, 28' protruding from the brush holder 8. The stay portion 19 of the brush holder 8 has holes 22, 2 through which the bosses 28, 28' of the bracket 20 are inserted.
2' and a recess 24 around the hole 22, 22'.
24', and plate-shaped elastic washers 23, 23' seated in the recesses 24, 24' are screwed into the screws 21, 24'.
21' to the boss 28,2 of the bracket 20.
8', and the brush holder 8 is fixed to the elastic washer 2.
3. A motor characterized in that it is held on a bracket 20 by elastic forces of 3 and 23'.