JPH11146595A - Dc motor with brushes equipped with brush holder cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a DC motor wire brushes, equipped with a brush holder cover capable of preventing insulation deterioration by avoiding the deposition of powder of worn brushes to a steel frame, preventing decreases in workability such as welding of various connecting wires and preventing jumping of short- circuit wires between brushes. SOLUTION: A cylindrically formed brush holder cover 2 is arranged concentrically with the rotating shaft 9 of a motor, so as to cover the outer peripheral portions of brush holders 4 attached to a brush holder attaching plate 3, and also to prevent the jumping out of a short-circuit wire 8 between brushes, a projected portion which is folded and bent in the rotating shaft direction is formed in the inner periphery of the brush holder cover.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technology of a DC motor with a brush, and more particularly to the technology of a DC motor with a brush having a cover for covering a brush holder.

[0002]

2. Description of the Related Art FIG. 2 is a half sectional view of a brush, a commutator, and a rotary shaft of a DC motor 50 with a brush.
In the figure, reference numeral 51 denotes a brush.
Are stored in the brush holder 52. The brush holder 52 is mounted on a brush holder mounting plate 54. The brush 51 includes a brush spring 5
3, the tip is pressed in the direction of the rotation shaft 56, and the tip end thereof is in contact with the commutator 55. Reference numeral 57 denotes a brass sheet to which a pigtail wire 58 is connected. Reference numeral 59 denotes an iron frame as an outer frame located at the outermost periphery of the brushed DC motor 50.

In such a brushed DC motor 50, the commutator 55 rotates integrally with the rotating shaft 56 and slides on the brush 51 in contact with the commutator 55. Brush abrasion powder M accumulates. The accumulated brush abrasion powder M causes insulation deterioration of each part and causes a failure.

As a countermeasure against this, as shown in FIG.
The brush holder mounting plate 53 'is formed into an L-shaped cross section by integral molding of a resin member, and one side portion 53'a of the L-shaped cross section is formed.
Is interposed between the iron frame 59 and the brush holder 52 so as to cover the brush holder 52. With such a configuration, the brush abrasion powder M conventionally deposited on the iron frame 59 is removed by the brush holder mounting plate 5.
3 'is deposited on one side portion 53'a of the L-shaped section and is isolated from the iron frame 59, so that the insulation deterioration is prevented from occurring at an early stage.

However, the brush holder mounting plate 5
If the length of the left and right sides 53'a of the side 3 'is increased in the drawing, the pigtail wire 58 may be connected to the sheet 57 by spot welding, or a brush-to-brush short-circuit line, a power line, or the like may be connected. However, there is a problem that the workability of the device is reduced and the quality becomes unstable.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and prevents brush wear powder from depositing on an iron frame to prevent insulation deterioration and to weld various connection wires. Workability such as does not decrease,
It is an object of the present invention to provide a DC motor with a brush including a brush holder cover that can prevent a short circuit line between brushes from jumping out.

[0007]

In order to achieve the above object, in the present invention, a motor is formed so as to cover an outer peripheral portion of a brush holder which is formed in a cylindrical shape and which is mounted on a brush holder mounting plate. A configuration that is coaxially arranged with the rotating shaft and that a suppressing portion that prevents the brush short-circuit line from jumping out is formed as a protruding portion that is bent in the rotating shaft direction on the inner peripheral portion of the cylindrical brush holder cover. It is assumed that.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1A shows a brush holder cover 2.
1 (b) is a front view of a brush holder mounting plate, and FIG. 1 (c) is a sectional view taken along the line BB of FIG. 1 (b). FIG. 1D shows a brush in a state where a brush holder cover is attached to the brush holder attachment plate.
FIG. 2 is a half sectional view of a main part of the DC motor with brush 1 centering on a commutator, a rotating shaft part and the like.

As shown in FIG. 1A, the brush holder cover 2 is integrally formed of a resin member or the like into a cylindrical shape. At the inner peripheral portion of the brush holder cover 2, a suppressing portion 2a for preventing a short-circuit line between brushes described later from protruding from the peripheral portion of the brush holder cover 2 in the direction of the rotation axis is projected. Provided in. The grooves formed on the upper and lower peripheral surfaces in the axial direction of the brush holder cover 2 are screw penetration grooves (not shown).

The brush holder cover 2 is shown in FIG.
It is fitted into a brush holder mounting plate 3 formed of a resin member shown in FIG. That is, two pairs of brush holders 4 to are mounted on the brush holder mounting plate 3 shown in FIG. 1B, and the brushes 5 are stored in the brush holders 4, respectively. Reference numeral 6 denotes a pigtail wire, reference numeral 7 denotes a brass sheet to which the pigtail wire is spot-welded, and reference numeral 8 denotes a short-circuit wire between brushes.

FIG. 1C is a cross-sectional view taken along the line BB of FIG. 1B. The brush holder cover 2 is fitted to the outer peripheral portion of the brush holder mounting plate 3 on which the above-mentioned components are mounted. . Further, on the inner periphery of the brush holder cover 2 fitted, there is provided a restraining portion 2a which bends and protrudes in the rotation axis direction from a predetermined position of an axial end of the peripheral surface, and the restraining portion 2a is provided with the brush. The short-circuit line 8 is suppressed so as not to protrude from the brush holder mounting plate 3.

FIG. 1D is a partial cross-sectional view of a main part in a state where the brush holder mounting plate 3 in which the brush holder cover 2 is fitted is mounted on the rotating shaft 9. The brush holder 4 houses the brush 5, and the brush 5 is pressed in the direction of the rotation axis by the brush spring 10, and the tip of the brush 5 contacts the commutator 11. The configuration of this portion is the same as that of the conventional technique described with reference to FIG. Also,
Reference numeral 12 denotes an iron frame which is an outer frame of the brushed DC motor 1.

In the brushed DC motor 1 constructed as described above, the sheet 7 and the
The brush holder 4 in which the brush 5 is incorporated is mounted on the brush holder mounting plate 3, and further, the brush-to-brush short-circuit line 8 and the pigtail line 6 are connected. As described above, since connection such as spot welding of various connection lines such as the brush-to-brush short-circuit line 8 and the pigtail line 6 is performed first, this connection operation can be easily performed.
In addition, it can be performed quickly and reliably. After these connections are completed, the outer periphery is covered with the brush holder cover 2. The brush-to-brush short-circuit line 8 is covered by the holding portion 2a of the brush holder cover 2 and does not come off the brush holder mounting plate 3 and jump out. Also, brush abrasion powder M [FIG.
(See (d)) accumulates on the brush holder cover 2 and does not directly contact the iron frame 12, so that early insulation deterioration does not occur.

[0014]

As described above, according to the present invention,
In addition to preventing brush abrasion powder from accumulating on the iron frame to prevent insulation deterioration, it is also possible to reliably, quickly and easily perform welding and other operations on various connecting wires, and to prevent jumping out of short-circuit wires between brushes. A DC motor with a brush provided with a brush holder cover that can be used.

[Brief description of the drawings]

1A is an external perspective view of a brush holder cover 2, FIG. 1B is a front view of a holder mounting plate, and FIG.
FIG. 3C is a sectional view taken along line BB of FIG. Also,
(D) is a half sectional view of a main part of the brushed DC motor 1 centering on the brush, commutator, rotating shaft and the like in a state where the brush holder cover is mounted on the holder mounting plate.

FIG. 2 is a cross-sectional view of a main part of a conventional brush, a commutator, and a rotating shaft portion attached to a brush holder.

FIG. 3 shows a brush, a commutator, and a rotating shaft for explaining a state in which the brush holder mounting plate shown in FIG. 2 is integrally formed with a resin member to have an L-shaped cross section, and brush abrasion powder M is deposited on the brush holder mounting plate. It is a principal part half sectional view of a part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... DC motor with brush 2 ... Brush holder cover 3 ... Brush holder mounting plate 4 ... Brush holder 5 ... Brush 7 ... Sheet 8 ... Short wire between brushes 9 ...・ Rotating shaft 11 ・ ・ Commutator 12 ・ ・ Iron frame

Claims (2)

[Claims] 1. A brush having a brush holder cover formed in a cylindrical shape and arranged coaxially with a rotation axis of a motor so as to cover an outer peripheral portion of a brush holder mounted on a brush holder mounting plate. DC motor. 2. The method according to claim 1, wherein the holding portion for preventing the short-circuit line between the brushes from jumping out is formed on the inner peripheral portion of the cylindrical brush holder cover as a projecting portion bent in the direction of the rotation axis. A brushed DC motor provided with the brush holder cover according to 1.