JPH05153751A - Brush holder for motor - Google Patents

Abstract

PURPOSE:To provide a brush holder suitable for automatic fabrication in which rotational direction of motor can be set easily. CONSTITUTION:The brush holder for motor comprises connecting boards 20a, 20b for electrically connecting one power supply terminal 27 with one brush 15, connecting boards 24a, 24b for electrically connecting the other power supply terminal with the other brush 16, and a connecting surface 22 for electrically connecting a pair of connecting boards 20a, 20b, 24a, 24b with each other, wherein the rotational direction of motor is selected by laterally disconnecting or longitudinally connecting the connecting surface 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a brush holder for a commutator motor.

[0002]

2. Description of the Related Art As a conventional one of this kind, an actual fair 3-4
As disclosed in Japanese Patent Publication No. 141 or Japanese Utility Model Publication No. 3-860, one in which a connecting conductor for connecting brushes of the same polarity is insert-molded on a resin substrate is known.

[0003]

In the conventional brush of the commutator motor, when the setting of the rotating direction of the motor is changed, the polarity of the power supply line connecting the connection conductor connected to each brush and the power supply is changed. Alternatively, the shape of the connecting conductor has to be changed so that the brushes of different polarities are connected to each other. When changing the polarity of the above-mentioned power supply line, it is necessary to prepare in advance two types, one for forward rotation and the other for reverse rotation of the power supply line. Since it is necessary to manufacture two types of connecting conductors having different shapes for reverse rotation, the manufacturing is extremely complicated and the productivity cannot be improved.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a brush holder capable of easily setting the rotation direction of an electric motor and suitable for automatic production.

[0005]

A brush holder for an electric motor according to the present invention has a connecting plate for electrically connecting one terminal of a power supply terminal and one brush, and the other terminal of the power supply terminal and the other. It has a connection plate that electrically connects with the brush of
A pair of connecting plates are provided with connecting surfaces that are electrically connected to each other, and the rotating direction of the electric motor can be selected by cutting the connecting surfaces in the horizontal axis direction or connecting them in the vertical axis direction. Is.

[0006]

In the brush holder of the electric motor of the present invention, an integral connecting plate for electrically connecting the power source terminal and the brush is prepared, and the connecting surface is cut in the vertical and horizontal directions, so that the forward and reverse rotation directions of the electric motor are decide. Therefore, a large number of one type of the connection plate can be manufactured and prepared, and the forward and reverse rotations can be determined before or after mold coating as the brush holder, which is suitable for mass production and automatic assembly.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view of an electric motor according to this embodiment,
In the figure, reference numeral 1 is an electric motor having a field pole 2 on its inner circumference. A field iron core 3 and a field coil 4 are connected to a power source through a lead wire 5. An armature 6 is composed of an iron core 7, an armature coil 8, a commutator 9, and a shaft 10. 11 is axis 1
0 is a bearing that supports 0, and 12 is an outer casing of the electric motor. 13 is a brush holder made of a mold resin, which is a brush screw 14,
17, brush spring 18, pigtail 19 and connection plates 20a, 20b, 24a, 24b for connecting these to a power source
(See FIG. 2). Reference numerals 15 and 16 represent brushes.

FIG. 2 shows a cross section taken along the line AA of the brush holder of FIG. Showing things. In FIG. 2, 20a, 2
Reference numeral 0b is a conductive connecting plate connected from the brush 15 to the negative terminal 27, and the negative terminal 27 is manufactured by bending the end portion of the connecting plate 20b. Further, the end portion of the connection plate 20a is fixed by the brush screw 14 via the bent portion 21 and is connected to the brush 15. Similarly, 24a, 24b
Indicates a conductive connecting plate connected from the brush 16 to the plus terminal 26, the end of the connecting plate 24a is bent to the plus terminal 26, and the end of the connecting plate 24b is bent to the brush screw via the bent portion 25. It is fixed to 17 and is connected to the brush 16. Furthermore, the connection plates 20a, 20b, 24a,
24b is bridged at the connection surface 22 before the forward / reverse rotation of the electric motor is determined. Reference numeral 23 is a hole provided in the connection surface 22, and the bridge portion is cut around this hole 23. The hole 23 is a standard for cutting work and may not be provided.

The connection plate is manufactured by punching out one conductive plate and bending it. Then, when it is determined whether the electric motor is rotating normally or reversely, it is selected whether the connecting surface 22 is cut in the horizontal direction as shown in FIG. 3a or in the vertical direction as shown in FIG. 3b. Depending on whether the terminal 26 is connected to the brush screw 14 or the positive terminal 26 is connected to the brush screw 17, the forward and reverse rotation directions of the electric motor can be selected.

Here, when the connecting surface 22 is cut off, as shown in FIG.
In the case of the lateral cut shown in a, the connection plate 20a and the connection plate 2
Since 0b is separated, the terminals 26 and 27 are separated. With this, when the brush holder 13 is molded, it takes a lot of time to position the terminals 26, 27 and the connecting portions with the brush screws 14, 17. Therefore, as shown in FIG. 4, when the connection plate is punched out, the premold 28
When fixed at 29 and 29, respectively, it is possible to mass-produce by an automatic machine without the trouble of molding.

As another embodiment, as shown by the dotted line in FIG. 2, the connecting surface 22 is formed when the brush holder 13 is molded.
It is also possible to make a window 30 in which is displayed and cut the connection surface 22 after the brush holder is completed. This method has an effect that the rotation direction can be freely selected after a large amount of one type of brush holder is produced.

[0012]

As described above, according to the present invention, the forward / reverse rotation of the electric motor depends on whether the connecting surface connecting the pair of power supply terminals and the pair of brushes is cut in the horizontal axis direction or the vertical axis direction. The direction can be easily selected, and this selection can be achieved only by a punching process such as punching. Consequently, the brush holder can be easily automatically manufactured from one type of conductive plate.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a commutator motor using a brush holder according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a brush holder according to an embodiment of the present invention.

FIG. 3 is a diagram showing a method of cutting the brush holder of FIG.

FIG. 4 is a side view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Motor 9 Commutator 13 Brush holder 14,17 Brush screw 15,16 Brush 18 Brush spring 19 Pigtail 20a, b Connection plate 22 Connection surface 23 Hole 24a, b Connection plate 26,27 Power terminal 28,29 Pre-molded 30 Window

Claims (1)

[Claims] 1. A brush holder of an electric motor having a pair of power supply terminals and a pair of brushes connected thereto, having a connection plate for electrically connecting one terminal of the power supply terminals to one of the brushes, and the power supply terminal. Having a connection plate for electrically connecting the other terminal and the other brush to each other, providing a connection surface for electrically connecting the pair of connection plates to each other, or cutting the connection surface in the horizontal axis direction, or A brush holder for an electric motor in which the rotation direction of the electric motor can be selected by selecting whether to connect in the vertical axis direction.