JPS62163542A - Brush holder for motor - Google Patents

Abstract

PURPOSE:To eliminate the improper slide of a brush in a motor by providing two cutouts on the side of a brush holder, and sufficiently increasing the longitudinal lengths of the cutouts of the holder to reduce the side pressure. CONSTITUTION:Cutouts 6 are formed on the side of a brush holder 1, and the longitudinal length of the cutouts 6 of the holder 1 are sufficiently increased. Brushes 3 are sufficiently pressurized from the sides by the spring actuators 2 erected at the cutouts 6. punched holes 5 are formed at the actuators 2. The holder 1 is inserted into a brush holder assembling hole formed on a brush base, and calked at the reverse side of the holder 1. A coil spring for pressing the brush 3 to a commutator side is inserted in to the holder 1. A pigtail extended from the brush 3 contained in the holder 1 is projected from the upper hole 7 of the holder 1 and connected with a connector.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a brush holding device having a brush restraining structure for a small electric motor, and particularly to a structure in which a restraining spring and a brush holding device are integrated.

[Conventional technology]

BACKGROUND ART Conventionally, in a brush holding device for a small electric motor, a means for forcibly restraining a brush, as disclosed in Japanese Utility Model Application No. 58-183072, has been used to prevent brush noise caused by contact between a commutator and a brush when an armature is operated.

Particularly in small electric motors, the brush vibration absorbing structure of Utility Model Application Publication No. 55-23774 is adopted, so that the brush and commutator rub directly together, and the high-frequency brush noise generated by the frictional fluctuations during this rubbing becomes harsh. Utility Model Application No. 58-183072 is an effective means for the above-mentioned brush noise, but in order to obtain good rectification and performance in small electric motors, the pressure to press the brush against the commutator is small, 500 to 300 gr/cyA, and copper It is a sintered material with around 40% carbon and has a soft surface strength of less than 20° shore strength, so even when a slight pressure is applied,
The pressing force reduces the force and causes poor commutation, and at the same time,
Depending on the means of applying lateral pressure, the soft brush surface may be damaged, causing the brush to stop moving and causing poor sliding. In addition, as in Utility Model Application No. 56-108358, a method of integrating the holder with the holder has been used as a means of applying lateral pressure, but even in this case, no effective effect could be obtained unless a method of reducing the lateral pressure was taken6. [Example] Examples will be described in detail below with reference to the figures.

FIG. 1 is a diagram of a brush holding device with a restraining spring according to the present invention.

FIG. 2 shows a diagram of the base assembly with the brush holder attached thereto, and FIG. 3 shows an illustration of the assembly of the brush holder.

The brush holding device 1 is provided with a notch 6 on the side surface, and the notch 6 is sufficiently long in the longitudinal direction of the brush holding device II. Also, the spring acting portion 2 raised by the notch 6
Pressure is applied to the brush 3 from the side. The spring acting portion 2 is provided with a punch hole portion 5. The brush holding device 1 is inserted into the brush holding device installation hole 13 provided in the brush base 10.

Caulk it on the opposite side of the brush holder ll.

A coil spring 14 that presses the brush 3 toward the commutator is inserted into the brush holding device 1. The pigtail is removed from the brush 3 housed in the brush holder 1 by the brush holder l.
1 from the upper hole 7 and connect it to the connector 11.

The long end of the pigtail is passed through the hole in the pigtail supporter 12 so that it does not move so that the pigtail does not wobble.

〔Effect of the invention〕

If the brush holding device of the present invention is used, a restraining spring integrated brush holding device having a spring acting portion is used as a means for pressurizing the brush from the side, and the spring acting portion of the brush holding device is
The notch is fully long in the longitudinal direction, and the cut and raised part becomes the spring acting part.

Since the holes are provided, the lateral pressure can be reduced, there is no problem of poor brush sliding, and the effect of reducing the brush noise caused by using a conventional restraint spring can be achieved.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the present invention, FIG. 2 is an assembled view of the base of the present invention, and FIG. 3 is an assembled view of the base of the present invention. DESCRIPTION OF SYMBOLS 1... Brush holding device, 2... Spring actuation part, 3...
brush. Sentence ≦ Ring wa -6 礒S parable, ichi groaning heat one 〈 -gu4 σ)

Claims (1)

[Scope of Claims] 1. A brush that stores the brush in a brush holding device for a small electric motor, which has means for suppressing movement of the brush caused by frictional force when the commutator and brush come into contact with each other when the armature rotates. A brush holding device for an electric motor, characterized in that two notches are provided on a side surface of the holding device, and the notches are sufficiently long in the longitudinal direction of the brush holding device. 2. A brush holding device for an electric motor according to claim 1, characterized in that a cut-out hole is provided in the cut and raised spring action portion.