JPH09247905A - Brush holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of a commutator motor by eliminating the sliding failure of a carbon brush due to the cause of a burr produced the inner peripheral side of a brush case when a terminal spring is welded to the outer peripheral side of the case and attempting to stabilize the commutation and prevent the abnormal wear of the brush in a brush holder of the motor used for a domestic motor cleaner. SOLUTION: A recess 6 is provided at the inner peripheral side of a brush case 1 obtained by pressing a conductive metal plate. A brush holder 4 is formed by welding a terminal spring 5 from the outer peripheral side to the recess 6 of the case 1. Since the spring is welded from the outer peripheral side to the recess of the case, even if a burr is generated at the inner peripheral side of the case, it is not projected to the sliding surface of the brush, and the slidability of the brush can be ensured, and hence the commutation failure or abnormal wear of the brush can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush holder for a commutator motor used in household vacuum cleaners and the like.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view showing the structure of a conventional brush holder, FIG. 5 is a sectional view of a conventional brush holder, and FIG. 6 is an enlarged sectional view of a conventional terminal spring welded portion. is there.
4, FIG. 5, and FIG. 6, 8 is a cylindrical brush box formed by pressing a conductive metal plate, and 2 is a pigtail 2a whose one end is connected to the bottom surface 8a of the brush box 8 inside. Carbon brush embedded, 3 is pigtail 2a
Is a brush spring passing through the inside, and 4 is a brush holder in which a terminal spring 5 is provided on the outer peripheral surface of the brush box 8. Here, the terminal spring 5 is welded to the brush box. Inside the brush box 8, the carbon brush 2 slides under the bias of the brush spring 3.

[0003]

In the conventional case, when the terminal spring 5 is welded to the brush box 8, the burr 7 projects from the inner peripheral surface of the brush box 8, so that the carbon brush 2 urged by the brush spring 3 is used. Slidability deteriorates. Due to this sliding failure, the ability of the carbon brush to follow the commutator piece deteriorates,
Rectification failure or abnormal wear of carbon brush may occur.

An object of the present invention is to attach the terminal spring 5 to the brush box 8
To eliminate the sliding failure of the carbon brush caused by the burr 7 generated on the inner peripheral surface of the brush box 8 when it is welded to the outer peripheral side, to stabilize the rectification and prevent abnormal wear of the carbon brush, It is to improve the reliability of the commutator motor.

[0005]

In order to solve this problem, the brush retainer of the present invention is such that a recess is formed (pressed) on the inner peripheral surface of the brush box, and the recess is provided with terminals from the outer peripheral surface side. The spring is attached by welding.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is a brush box formed by pressing a conductive metal plate,
In a brush holder comprising a carbon brush slidably housed in the brush box and a terminal spring attached to the outer peripheral surface of the brush box, a recess is provided in the inner peripheral surface of the brush box, and the brush is provided in the recess. The terminal spring is welded from the outer peripheral surface side of the box, and even if burrs are generated on the inner peripheral surface of the brush box when the terminal spring is welded from the outer peripheral surface side of the brush box, the sliding surface of the carbon brush It has the effect of preventing the carbon brush from sliding, and ensuring the slidability of the carbon brush.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. 1 is a perspective view showing a structure of a brush holder according to an embodiment of the present invention, FIG. 2 is a sectional view of the brush holder according to the present invention according to an embodiment of the present invention, and FIG. It is an expanded sectional view of the terminal spring welding part of the present invention in one embodiment of the invention. The components of the brush holder 4 other than the brush box 1 are the same as those in FIG. Reference numeral 1 is a brush box formed by pressing a conductive metal plate, and a recess 6 is provided on the inner peripheral surface thereof. The brush holder 4 has a structure in which a terminal spring 5 is welded from the outer peripheral surface to a convex portion 9 provided on the outer peripheral surface of the brush box 1 corresponding to the concave portion 6 provided on the inner peripheral surface of the brush box 1.

With this structure, the effect of preventing defective rectification or abnormal wear of the carbon brush can be obtained.

[0009]

As described above, according to the present invention, since the terminal spring is welded to the concave portion of the brush box from the outer peripheral surface side as described above, even if burrs are generated on the inner peripheral surface of the brush box, the sliding surface of the carbon brush is Since it is possible to secure the slidability of the carbon brush without protruding to the side, it is possible to prevent defective rectification and abnormal wear of the carbon brush.

[Brief description of drawings]

FIG. 1 is a perspective view showing a structure of a brush holder according to an embodiment of the present invention.

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

FIG. 3 is an enlarged cross-sectional view of a terminal spring welded portion according to the embodiment of the present invention.

FIG. 4 is a perspective view showing the structure of a conventional brush holder.

FIG. 5 is a sectional view of a conventional brush holder.

FIG. 6 is an enlarged sectional view of a conventional terminal spring welded portion.

[Explanation of symbols]

 1,8 Brush box 2 Carbon brush 2a Pigtail 4 Brush retainer 5 Terminal spring 6 Recess 7 Burr

Claims (1)

[Claims] 1. A brush box formed by pressing a conductive metal plate, a carbon brush slidably accommodated in the brush box, and a terminal spring attached to the outer peripheral surface of the brush box. In the brush holder, a recess is provided on the inner peripheral side of the brush box, and a terminal spring is welded to the recess from the outer peripheral side of the brush box.