JPS61177152A - Motor with commutator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a commutator-equipped motor used as a drive source for audio equipment, household equipment, and other various equipment.

BACKGROUND OF THE INVENTION In recent years, commutator-equipped motors have been incorporated as driving sources for a large number of devices such as audio equipment, home appliances, and office equipment due to their features such as small size, high efficiency, high controllability, and low cost.

A conventional electric motor with a commutator will be described below with reference to the drawings.

4 and 6 show the armature structure of a conventional commutator-equipped motor. In FIG. 4, 1 is an armature shaft. A fixing plate 2 fixes the armature shaft 1 and the coil 3. 6 is a commutator, which is connected to the armature shaft 1 via adhesive 4.
is fixed to.

In FIG. 6, the commutator 6 is press-fitted onto the armature shaft 1 without using the adhesive 4 shown in FIG. 4.

Problems to be Solved by the Invention However, in the structure shown in FIG. When inserting the commutator 6 into the armature shaft 1, the adhesive becomes the adhesive retainer 4b, flows into the slit groove 6& of the commutator 6, passes through it, and becomes the sliding surface 6 of the commutator 6.
This has the problem of causing poor electrical conductivity because it flows out into the b and hardens. On the other hand, in the configuration shown in FIG. 5, the strength of the press-fit connection between the armature shaft 1 and the commutator 6 decreases due to variations in the dimensions of the press-fit connection between the armature shaft 1 and the commutator 6, and changes over time. There was a problem that it deviated from the position.

The present invention has been made in view of the above-mentioned problems, and it is possible to easily and reliably make the film thickness of the adhesive applied to the armature shaft uniform and in the required amount in order to fix the armature shaft and the commutator. An object of the present invention is to provide a commutator-equipped electric motor having an armature that prevents adhesive from flowing out into a sub-slit groove portion and a commutator sliding portion, and has a stable adhesion force between an armature shaft and a commutator.

Means for Solving the Problems In order to solve the above problems, a motor with a commutator according to the present invention includes a commutator having an inner diameter hole larger than the armature shaft diameter and a slit groove in the brush sliding part, and the commutator. A spacer is coated in advance on the armature shaft, and has a spacer that is in close contact with the end face of the commutator so as to cover the opening of the slit groove exposed on the end face of the armature shaft, and has an inner diameter hole that is approximately the same size as the center inner diameter hole of the commutator. This motor is equipped with a commutator that is fixed with an adhesive.

Effect of the present invention With the above-described configuration, the spacer having an inner diameter larger than the diameter of the armature shaft passes through the adhesive applied to the outer periphery of the armature shaft where the armature shaft and the commutator engage, thereby rectifying the current. The thickness of the adhesive film applied to the outer periphery of the armature shaft for fixing the armature can be adjusted to the required amount according to the dimensional difference between the inner diameter of the spacer and the outer diameter of the armature shaft, and the thickness of the adhesive film is uniform. This makes it possible to secure the desired adhesion strength between the armature shaft and the commutator, and the adhesive portion that is unnecessary for the adhesion part of the armature shaft and commutator is separated from the commutator by the spacer. By doing so, it is possible to prevent the adhesive from flowing into the commutator slit groove portion, passing through the commutator slit groove portion, and flowing out to the commutator sliding portion, and the above-mentioned problems can be solved.

EXAMPLE Hereinafter, a motor with a commutator according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows an armature of a commutator-equipped motor according to a first embodiment of the present invention. In FIG. 1, 1 is an armature shaft, 2 is a fixing plate, which is fixed to the armature shaft 1,
The commutator 6 is fixed in position via a plate-shaped spacer 6, and is fixed to the coil 3 via an adhesive. 4 is an adhesive, and the armature shaft 1 and the commutator 6 are fixed to each other via the commutator fixing adhesive 4a. A plate-shaped spacer 5 shields the adhesive material 4b and the commutator 6.

Figure 2 shows a motor with a non-ferrous core commutator, which is an example of a motor with a commutator, in a completed assembled state, where 7 is a brush, 8 is a yoke, and 9 is a field frame having a field magnet 1o. .

As described above, according to this embodiment, the adhesive 4 applied to the outer periphery of the armature shaft 1 is coated by providing a plate-shaped spacer 5 having an inner diameter larger than the shaft diameter of the armature shaft 1. By inserting and moving the plate-shaped spacer 6 from the shaft end along the armature shaft 1, the adhesive 4a for commutator fixing having the required amount and uniform film thickness and the adhesive unnecessary for fixing the commutator are removed. The material 4b can be separated from the material 4b, and in this state, by tightening the commutator A to the 2-thin 1-piece pongee Ff λ1 TAYOJ or NOF\, the commutator can be rectified by the adhesive 4a for fixing the commutator. The adhesion strength between the child 6 and the armature shaft 1 can be ensured, and the plate-shaped spacer 6 separates the commutator 6 from the adhesive material 4b, so that the adhesive material 4b is attached to the slit groove portion of the commutator 6. It is possible to prevent an accident in which the resin flows out onto the sliding surface 6b through 6N and hardens, resulting in poor electrical continuity.

Note that the plate-shaped spacer 5 may be configured to also serve as the commutator position fixing spacer 2b, as shown in FIG. 3 showing the second embodiment, and the plate-shaped spacer 6 and the commutator position fixing spacer It goes without saying that the shape of the inner diameter hole 2b is not limited to a circular shape, and as long as it has irregularities, the smallest part thereof may be press-fitted with the armature shaft.

Effects of the Invention As described above, the present invention provides an armature in which a commutator having a slit groove in the brush sliding portion is fixed to the armature shaft via an adhesive, and the commutator is exposed at the end face of the shaft of the commutator. By providing a spacer that closely fits the end face of the commutator shaft so as to cover the opening of the slit groove and has an inner diameter hole that is approximately the same size as the inner diameter hole of the commutator, it is possible to secure the commutator to the outer circumference of the armature shaft. The thickness of the adhesive film can be made uniform to the desired amount, and the opening of the slit groove on the end face of the commutator shaft is suppressed, thereby preventing the adhesive from flowing into the slit groove and flowing out onto the commutator sliding surface. It is highly effective in preventing electrical conduction defects.

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts of a motor with a commutator according to a first embodiment of the present invention, and FIG. 2 is a non-iron core commutator which is an example of a motor with a commutator using the configuration shown in FIG. FIG. 3 is a cross-sectional view showing the main parts of a commutator-equipped motor according to a second embodiment of the present invention, and FIGS. 4 and 5 are main parts of a conventional commutator-equipped motor. FIG. 1... Armature shaft, 4... Adhesive material, 42L.
...Adhesive for commutator fixation, 4b...Adhesive material, 5...Plate spacer, 6...Commutator, 62L... Commutator slit groove part, 6b・
... Commutator sliding surface. Name of agent: Patent attorney Toshio Nakao and 1 other person
2 Figure 3

Claims (1)

[Claims] a commutator having an inner diameter hole larger than the armature shaft diameter and a slit groove in the brush sliding portion; A commutator-equipped electric motor comprising a spacer having an inner diameter hole of approximately the same size as the center inner diameter hole of the child, and fixed to the armature shaft via an adhesive applied in advance.