JPH0218668Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to a brush base mounting structure for a motor for electrical equipment, which is used to properly mount a brush base on a motor.

(Prior Art) A conventional brush base mounting structure for a motor for electrical equipment is shown in FIG.

In Fig. 6, 1 is a motor yoke, 2 is an end bracket fixed to the opening 1a of the motor yoke 1, 3 is an armature shaft rotatably held by the end bracket 2 via a bearing 4, and 5 is an armature. 6 is a commutator, 7 is a brush base holder, 8 is a brush base fixed to the brush base holder 7 with screws 9, 10 is a brush holder fixed to the brush base 8 with the screws 9, 11 is the commutator 6 This brush is biased by a coil spring 12. In this case, when attaching the brush base holder 7 to the motor yoke 1, the outer diameter of the brush base holder 7 is made slightly smaller than the opening diameter of the motor yoke 1, and the outer diameter of the brush base holder 7 is approximately A vertical rising portion 7a is provided, a hole 7b is provided at the base of the rising portion 7a, and the brush base holder 7 is attached to the motor yoke 1.
The brush base holder 7 is inserted through the opening 1a, and the hole 7b formed in the brush base holder 7 is locked by the protrusion 1b formed on the inner circumference of the motor yoke 1, so that rotation in the circumferential direction is impossible. Then, the end bracket 2 was fitted onto the open end of the motor yoke 1 and fixed by bending the bent end 1c.

However, in such a conventional brush base mounting structure, the brush base holder 7 has an outer shape that is slightly smaller than the inner diameter of the opening 1a of the motor yoke 1, and a rising portion 7a that is substantially perpendicular to the outer shape. Then, a hole 7 is formed at the base of the rising portion 7a.
Since the brush base holder 7 has a smaller outer diameter and can be easily inserted into the opening 1a of the motor yoke 1, the brush base holder 7 can be easily inserted into the opening 1a of the motor yoke 1. A gap is likely to occur between the brush base holder 7 and the rising portion 7a, and the movement of the brush base holder 7 in the circumferential direction is only restricted by the projection 1b, and the movement in the axial direction is restricted by the motor yoke 1. Since only one side of the brush base 8 is supported by the protrusion 1b and the hole 7a of the brush base holder 7, abnormal sounds and noise may be generated due to rattling during use, and the sliding position of the brush 11 may be affected. There is a problem that the brush base holder 7 may change and cause noise or degrade performance, and in some cases there is a risk that the brush base holder 7 may fall into the motor yoke 1.

(Purpose of the invention) This invention was made to solve the above-mentioned conventional problems.The brush base is attached to the motor yoke extremely well, and abnormal noises caused by insufficient attachment of the brush base are avoided. It is an object of the present invention to provide a brush base mounting structure for a motor for electrical components that is free from the risk of occurrence or performance deterioration and is also easy to assemble.

(Structure of the invention) This invention is a motor for electrical components in which an end bracket is fixed to an opening of a motor yoke and a brush base is provided near the opening, and the brush base is attached to a brush base holder. The outer diameter of the holder is made slightly smaller than the inner diameter of the opening of the motor yoke, and the outer diameter of the brush base holder is provided with an inclined rising portion that gradually becomes larger than the inner diameter of the opening of the motor yoke. The base holder is fitted into the opening of the motor yoke with the rising part elastically deformed, and the end bracket is fitted into the opening, and the folded part provided on the rising part of the brush base holder and the end are fitted. The present invention is characterized in that the bracket is caulked and fixed between a stepped portion provided on the motor yoke and a bent end at the tip of the motor yoke.

(Embodiment) Figures 1 to 5 are diagrams showing an embodiment of this invention, in which, like the motor in Figure 6, 1 is a motor yoke, and 2 is fixed to an opening 1a of the motor yoke 1. 3 is an armature rotatably held by the end bracket 2 via a bearing 4, 5 is an armature coil, and 6 is a commutator. Further, 17 is a brush base holder, 18 is a brush base fixed to the brush base holder 17, 19 is a brush holder, and 20 is a brush urged by the coil spring 21 to the commutator 6.

Of these, the brush base holder 17 has a base portion 171 that has an outer shape slightly smaller than the inner diameter of the opening 1a of the motor yoke 1, and the opposing edges of the outer portion of the base portion 171 have:
The motor yoke 1 has two inclined rising portions 172 that are gradually larger than the inner diameter of the opening 1a of the motor yoke 1. An outward folded portion 173 is formed at a part of the tip of this rising portion 172, and an engagement hole 174 is formed from the base portion 171 to the rising portion 172. In addition, the base part 1
A bent portion 175 is formed on the other edge of 71 to form a boat shape as a whole. Further, an opening 176 is formed in the center portion of the base portion 171, and a base supporting cut and bend piece 177 and a cut and bend piece 178 are formed, and a base fixing piece 179 is further formed in the bend and bend portion 175. It is something that has a shape.

On the other hand, the brush base 18 has a locking hole 181 with the brush base holder 17 and a locking hole 181 with the brush holder 19.
and a locking hole 182 with a base fixing piece 179 formed on the brush base holder 17.
and a locking hole 18 formed in the brush base 18.
1 and fixed to each other by bending the base fixing piece 179, and the brush holder 19
The leg piece 191 formed in the brush base 18 is fitted into the locking hole 182 formed in the brush base 18 to
They are fixed to each other by bending 91.

In this way, the base holder 18 and the brush holder 19 are assembled to the brush base holder 17, and this assembly is fitted into the opening 1a of the motor yoke 1 in the left direction in FIG. The engagement hole 174 provided in the base holder 17 is engaged with the engagement protrusion 1d provided on the inner surface of the motor yoke 1, and the folded portion 173 of the brush base holder 17 is formed in the opening 1a of the motor yoke 1. Then, the end bracket 2 is fitted into the opening 1a of the motor yoke 1 in the left direction in FIG.
The brush base holder 17 and the end bracket 2 are brought into contact with the second step part 1f formed at the opening end of the motor yoke 1, and then the bent end 1c formed at the open end of the motor yoke 1 is bent inward. Motor yoke 1
Fixed to.

Therefore, the rising portion 172 of the brush base holder 17 is strongly elastically pressed against the inner wall portion of the motor yoke 1, and the folded portion 173 provided on the rising portion 172 and the end bracket 2 are connected to the first portion of the motor yoke 1. , the second step portions 1e, 1f and the bent end 1c of the motor yoke 1 are sandwiched and fixed by caulking. It can be operated reliably without any problems.

(Effects of the invention) As explained above, according to this invention,
In a motor for electrical components in which an end bracket is fixed to an opening of a motor yoke and a brush base is provided near the opening, the brush base is attached to a brush base holder and the outer shape of the brush base holder is adjusted to the opening of the motor yoke. The brush base holder has a shape that is slightly smaller than the inner diameter of the opening, and an inclined rising part that gradually becomes larger than the inner diameter of the opening of the motor yoke is provided on the outer shape of the brush base holder.
The brush base holder is fitted into the opening of the motor yoke with the rising part elastically deformed, and the end bracket is fitted into the opening, and the folded part provided on the rising part of the brush base holder is fitted into the opening of the motor yoke. Since the end bracket is caulked and fixed between the stepped portion provided on the motor yoke and the bent end of the tip of the motor yoke, the brush base holder and the brush base can be attached to the motor yoke extremely well. This provides an extremely excellent effect with great practical value in that it is possible to prevent the generation of abnormal noise and the deterioration of performance due to incomplete attachment of the brush base and brush base holder as in the past.

[Brief explanation of the drawing]

1 and 2 are an axial cross-sectional view and an axis-perpendicular cross-sectional view, respectively, showing a brush base mounting structure for an electrical component motor according to an embodiment of the invention; FIG. 3 is a front view of a brush base holder; Fourth
The figure is an exploded view of the motor yoke, brush base holder, brush base, brush holder, and end bracket. Figure 5 is a perspective view of the brush base holder and brush base assembly. Figure 6 is a diagram of a conventional motor for electrical components. FIG. 3 is an explanatory axial cross-sectional view showing the brush base mounting structure. 1...Motor yoke, 1a...Opening, 1c...
...Bent end, 1e, 1f...Step part, 2...End bracket, 17...Brush base holder, 18...
... Brush base, 172 ... Inclined rising part,
173...Folding section.

Claims (1)

[Scope of utility model registration request] In a motor for electrical components in which an end bracket is fixed to an opening of a motor yoke and a brush base is provided near the opening, the brush base is attached to a brush base holder and the outer shape of the brush base holder is adjusted to the opening of the motor yoke. The outer diameter of the brush base holder is slightly smaller than the inner diameter of the opening of the motor yoke, and the outer diameter of the brush base holder is provided with an inclined rising part that gradually becomes larger than the inner diameter of the opening of the motor yoke, so that the brush base holder is elastically deformed. In this state, the brush base holder is fitted into the opening of the motor yoke, and the end bracket is fitted into the opening. A brush base mounting structure for a motor for electrical equipment, characterized in that the brush base is fixed by caulking between the part and the bent end of the tip of the motor yoke.