JPS605716Y2 - electric motor brush holder - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a brush holder used, for example, in an electric motor.

Examples of conventional brush holders include those shown in FIGS. 1 and 2 (see Japanese Utility Model Publication No. 55-34630).

That is, 1 is a disc-shaped base plate attached to a case (not shown) of an electric motor with screws 2, and a circular hole 4 is formed in the center of this base plate 1 into which a commutator 3 of the electric motor is loosely inserted. has been done.

Reference numeral 5.5' designates a pair of brush holders made of plate springs bent into substantially arcuate shapes facing each other, and each of the brush holders 5, 5
The proximal ends of ' are respectively attached to the base plate 1,
The tips are pulled toward each other by a tension spring 7 via insulators 6, 6'.

Reference numerals 8 and 8' designate a pair of brushes respectively attached to the middle part of the brush holder 5.5' so as to face each other.

However, such a conventional brush holder 5.5'
As shown in detail in FIG. 2, screws 2 and the like are arranged on the base plate 1, and the brush holders 5, 5
' are supported by the base plate 1 in a cantilever manner only at their proximal ends, and their tips are pulled close to each other by a tension spring 7. Therefore, when the commutator 3 is not inserted into the hole 4, these 1 The pair of brush holders 5° and 5' are deformed so as to approach each other, and the commutator 3 has to insert the brush holders 5 and 5' while expanding them using a jig, which is a problem in that the workability is poor. Further, since the brush holders 5 and 5' have a substantially arched shape, there is a problem that the base plate 1 becomes large.

This idea was devised by focusing on these conventional problems, and it consists of a pair of abbreviated arms that are supported by a base plate so as to be able to swing freely around the bends thereof, and each has a brush attached to one end of the arm. The brush holder of the electric motor is configured such that the arm is fixed by inserting each other end into a groove of the holder, and the arm is biased by a spring so that the brushes approach each other through the holder. ,
The purpose is to solve the above problems.

This invention will be explained below based on the drawings.

FIG. 3 is a diagram showing an embodiment of this invention.

First, the configuration will be explained.

In FIG. 3, reference numeral 11 denotes a disc-shaped base plate made of an insulating material, and this base plate 11 is attached to a case of an electric motor (not shown).

A circular through hole 12 is formed in the center of the base plate 11, and a commutator 13 of the electric motor is loosely inserted into the through hole 12.

14.14' is a pair of pins attached to the base plate 11 at a predetermined distance apart, and these pins 14.1
4' are fitted with bent portions of a pair of abbreviated arms 15 and 15', respectively.

That is, each arm 15.15' has a pin 14.1
The arms 15 and 15' are swingably supported by the base plate 11 with the arm 4' as a fulcrum, and one end portions of the arms 15 and 15' are provided so as to face each other across the through hole 12, and the other end portions are provided so as to overlap each other vertically.

16.16' is a pair of brushes fixed to one end of the arm 15.15' so as to face each other.

Reference numeral 17 denotes a holder made of an insulating material and having an H-shaped cross section. This holder 17 has an upper groove 18 and a lower groove 19 that are curved in an arc shape so that the center of the side wall protrudes inward. The arm 15 is in the lower groove 19.
, 15' are loosely inserted.

A spring retainer 20 is mounted on the base plate 11 near the through hole 12 between the pair of pins 14 and 14', and a holder 17 is attached to the spring retainer 20 so that the brushes 16 and 16' approach each other. A spring 21 is held through which the other ends of the arms 15, 15' are always biased.

Next, the effect will be explained.

Now, the other ends of the arms 15 and 15' are loosely inserted into the upper groove 18 and lower groove 19 of the holder 17, respectively, and the holder 17 is constantly urged by the spring 21 in the direction away from the through hole 12.

As a result, the arm 15.15' swings about the pin 14.14' as a fulcrum, that is, the center of swing, so that the brushes 16, 16' approach each other.

At this time, since the other ends of the arms 15, 15' are restricted by the side walls of the upper groove 18 and lower groove 19 of the holder 17, one end of the arms 15, 15' is swung to a position separated by a predetermined distance. only.

In this state, when inserting the commutator 13 into the through hole 12, the holder 17 is first pressed against the spring 21.

As a result, the arms 15 and 15' swing about the pins 14 and 14' as fulcrums so that their one ends are separated from each other.

Next, the commutator 13 is inserted into the through hole 12.

Then, the holder 17 is released.

As a result, the arm 15.15' swings about the pin 14.14' so that its one ends approach each other, and the brushes 16, 16' come into contact with the commutator 13.

As described above, the arms 15 and 15' can be easily expanded by simply pressing the holder 17, so that the commutator 13 can be easily inserted.

As explained above, according to this invention, a pair of abbreviated arms each having a brush fixed to one end are provided to be swingable on the base plate around the bent portion, and both of these arms are A holder is provided to hold the other end of the brush by inserting it into the groove, and a spring urges the arm via the holder so that the brushes approach each other, so it is not necessary to use a jig or the like for the commutator. In addition, the arm can be made smaller and the remaining space on the base plate becomes larger, which can be used more effectively.

Furthermore, if the arm is supported on the base plate via a pin, the arm will not deform and the brush will accurately abut on a predetermined portion of the commutator.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a conventional brush holder, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig. 3 is an exploded perspective view showing an embodiment of the brush holder according to the invention. It is. 11... Base plate, 12... Through hole, 13... Commitator, 14.14'...
...Pin, 16.16'...Brush, 15
．． 15'...Arm, 17...Holder, 20...Spring retainer, 21...
··spring.

Claims (1)

[Scope of utility model registration request] A base plate having a through hole into which a commutator is inserted, is bent into an abbreviated shape, is swingably supported by the base plate around the bent part, and is slidably connected to the commutator at one end. A pair of arms to which brushes are fixed; a holder which has grooves into which the other ends of the pair of arms are inserted; and which is movably provided on the base plate; A brush holder for an electric motor, comprising: a spring that biases the ends of the brushes to bring the brushes closer together.