JPS5932194Y2 - Brush for small motor - Google Patents

Description

[Detailed description of the invention] This invention forms a winding part in the middle part of the length of a wire spring, provides straight parts on both sides of the winding part, and has the winding part in the straight part on the negative side. A retaining winding portion is formed having an axis that opposes the axis at a substantially right angle to the axis of the straight portion and also intersects with the axis of the straight portion on the − side, and furthermore, an engagement line in a substantially radial direction is formed in the winding portion. The wire spring holder is configured such that the holding winding portion of the wire spring holder is elastically fitted into the outer periphery of the upper end of the brush body, and the engagement line is an engagement groove provided on the upper end surface of the brush body. This relates to a brush for a small motor that is fitted with a
To provide a motor brush that is easy to assemble and manufacture and to attach to a small motor casing.

Several embodiments of the invention will now be described with reference to the accompanying drawings.

1 to 4 show a first embodiment, and FIG. 1 shows the structure of a wire spring holder, in which a winding portion 3 is provided at the middle of the length of the wire spring 2, and straight portions 4 on both sides thereof, One straight part 4 of 5
opposite at right angles to the axis a of the winding part 3,
A holding winding part 6 having an axis intersecting perpendicularly to the extending direction of the straight part 4 is formed, and an engagement part bent in a radial direction parallel to the straight part 4 is formed at the end of the winding part 6. Line 7 is provided.

The engagement line 7 may be provided at a right angle to the straight portion 4 or at an angle therebetween.

The brush 11 supported by the wire spring holder 1 is
As shown in the figure, the inner periphery of the winding holding part 6 is formed into a hexagonal shape as shown in the figure or a quadrangular cross section shown by a chain line, and a V-shaped image matching groove 12 parallel to the straight part 4 is formed on the upper end surface. .

As shown in FIG. 3, an engaging protrusion 11a having the same cross-sectional shape as shown in FIG. 2 and having a height greater than the height of the holding winding portion 6 may be provided on the upper surface of the brush body 13 having a rectangular cross section. I can do it,
In that case, a V-shaped engagement groove 12a similar to that shown in FIG. 2 is formed on the upper end surface of the engagement protrusion 11a.

The V-shaped image matching grooves 12, 12a shown in FIGS. 2 and 3 may be provided at right angles to the straight portion 4 or at an angle therebetween.

To assemble the small motor brush 15 by attaching the brush body 13 shown in FIG. 3 to the wire spring holder 1 shown in FIG. They are engaged by resilient contact, and the engagement line 7 is fitted into the square-shaped engagement groove 12a as a rotation stopper.

Although the straight part 4 and the engagement line T are made parallel in the above example, the diameter of the winding of the holding winding part 6 may be slightly enlarged when the engagement protrusion 11a is fitted into the holding winding part 6.

Therefore, in such a case, the wire spring holder 1 is constructed by slightly enlarging the diameter of the winding, fitting it into the engaging protrusion 11a, and adjusting the wire to be parallel to the straight portion 4.

Assembling a brush for a small motor when the engagement line 7 is formed perpendicularly to the linear part 4 and the V-shaped image fitting groove 12 or 12a is formed perpendicularly to the protruding direction of the linear part 4 is also carried out as follows. There is no difference in principle from the assembly shown in Figure 4.

5 to 8 show a second embodiment, in which the wire spring holder 1b shown in FIG.
, 5b are basically the same as in the first embodiment.

The only difference is that the straight portion 4b is formed to cross the diameter line of the holding winding portion 6b formed at the end thereof, and the crossing portion is used as the engagement line 7b.

The brush 21 shown in FIG. 6, which is similar to FIG. 2, is formed into a cylindrical shape and has a V-shaped image groove 22 on its upper end surface into which the engagement line 7b is fitted.

Further, the engagement protrusion 21a provided on the upper surface of the brush body 23 of FIG. 7, which is formed according to FIG. 3, is cylindrical and has a V-shaped engagement groove 22a formed in its upper end surface.

The engagement protrusion 21a of the brush 21 or the brush body 23 includes:
Slightly expand the winding part 6b of the wire spring holder 1b described above,
Fit and lock as shown in Figure 8 to prevent rotation.

9 and 10 show a third embodiment, in which a winding part 33 is provided in the middle part of the length of the wire spring 32 according to FIG. 34 is provided with a holding winding part 36 and an engaging wire 37 similar to the holding winding part 6 and engaging wire 7 shown in FIG. Configure.

a brush body 41 supported by the line splatter holder 31;
is formed with an engaging protrusion 42 having a rectangular cross section into which the holding winding part 36 fits and contacts elastically, and about one or two turns of the holding winding part 36 is fitted into the protrusion 42 and engaged. A pair of engagement grooves 43 consisting of opposing V-shaped grooves, and a V-shaped image matching groove 44 on the upper surface that is equivalent to the V-shaped image matching groove 12a in FIG. 3 are formed.

The assembly of the wire spring holder 31 and the brush body 41 is similar to that shown in FIG. 4, except that a part of the holding winding part 36 is fitted into the engagement notch 43, so the assembly structure of a brush for a small motor is shown. illustration is omitted.

11 and 12 show a fourth embodiment, in which a winding portion 33b and straight portions 34a, 35b of a wire spring 32b are respectively formed according to FIG. 9, and a square winding is formed at the end of the straight portion 34b. The straight line part 34b is made to cross the holding winding part 36b according to FIG. 5, and the wire spring holder 31b is constructed by using the transverse part as the engagement line 37b.

The brush main body 41a shown in FIG. 12 supported by the wire spring holder 3'1b is formed with an engagement protrusion 42a having a rectangular cross section, into which the holding winding part 36b fits and comes into elastic contact.
2a is provided with an engagement groove 43b consisting of a square groove into which the first or second turn of the end portion of the holding winding portion 36b is fitted.

FIG. 13 shows an example of a mode in which the brush for a small motor shown in FIG. 4 is assembled into a small motor. 53, the wire spring holder 1, the winding portion 3 of the wire spring holder 1,
3, turn the chain line straight parts 5, 5 counterclockwise to hook them onto the appropriate engaging pieces 54, 54, and elastically hold the engaging protrusions 11a, 11a by the holding winding parts 6, 6. The winding portion 3.
Let 3 store it.

The wire spring holders of the second to fourth embodiments are also assembled in accordance with FIG. 13.

The present invention has the structure clarified by the explanation of each embodiment described above, and the winding part formed in the middle part of the length of the wire spring is made smaller by moving one of the straight parts in the direction of unwinding. A brush that stores springing elasticity in the winding direction by engaging the motor, and is further held by a holding winding, and the engagement line of the two windings fits into the engagement groove on the end face of the brush body. accurately generates contact elasticity to the motor rotor.

Further, since the holding winding part has an axis that is linearly opposed to the axis of the winding part and also intersects with the extending direction of the straight part, the holding winding part The elastic contact of the held brush to the motor rotor due to the stored elasticity generated in the winding portion can be maintained with appropriate elasticity even if there is wear.

Furthermore, the brush member is elastically engaged by the wire spring holder by fitting the brush itself or the engagement protrusion provided on the brush into the holding winding part and fitting the engagement line into the engagement groove on the end surface. Because they are held together, it is easy to assemble the wire holder and brush, and it is easy to assemble the brush for small motors into the motor casing, and when the brush is subjected to the rotational force of the motor rotor, the wire holder and brush can be easily assembled. This has the effect of providing sufficient force to prevent the spring from escaping from the holder.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, and FIGS. 1 to 4 show a first embodiment, in which FIG. 1 is a perspective view of a wire spring holder 1, FIG. 2 is a perspective view of a brush 11, and FIG. 3 is a perspective view of a wire spring holder 1. 4 is a perspective view of a brush body 13 having an engaging protrusion 11a having a similar shape to that of the brush 11;
The figure shows an example of how the wire spring holder 1 and the brush body 13 are assembled. 5 to 8 show the second embodiment, FIG. 5 is a perspective view of the wire spring holder 1b, FIG. 6 is a perspective view of the brush 21, and FIG. 7 is an engaging protrusion 21a having a similar shape to the brush 21. FIG. 8 is a perspective view of the brush body 23 provided with the brush body 23, and FIG. 8 is an assembly example diagram of the wire spring holder 1b and the brush body 23. Figures 9 and 10 show a third embodiment, and Figure 9 is a perspective view of the brush body 41 supported by a wire spring holder. 11 and 12 show the fourth embodiment, FIG. 11 is a perspective view of the wire spring holder 31b, and FIG. 12 is a perspective view of the wire spring holder 3.
It is a perspective view of the brush main body 41a supported by 1b. FIG. 13 is a front view showing how the small motor brush shown in FIG. 4 is assembled to the motor. Llb, 31.31b...Line spring holder, 3°3b
, 33, 33b... winding section, 6, 6b, 36° 36b
...Holding winding part, 11, 21...Brush, 13゜23
．． 41, 41a... Brush body.

Claims (1)

[Scope of utility model registration request] A winding part is formed in the middle part of the length of the wire spring, straight parts are provided on both sides of the winding part, and the straight part on the negative side opposes the axis of the winding part at a substantially right angle, A wire spring holder is formed by forming a holding winding part having an axis that also intersects with the axis of the linear part on the negative side, and further providing a substantially radial engagement line in the winding part. A brush for a small motor, in which a holding winding part of a wire spring holder is elastically fitted into the outer periphery of the upper end of a brush body, and an engagement line is fitted into an engagement groove provided on the upper end surface of the brush body.