JPH0229798Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positioning device for a stator of an electric motor and a lid of a machine frame or the like fitted to the stator.

Conventionally, there are devices of this type as shown in FIGS. 1a to 1c. In the figure, 1 is a motor stator consisting of a cylindrical yoke 2 made of mild steel and a field magnetic pole 3 fixed to the inner peripheral surface of the yoke 2, and 4 is an end of the yoke 2. 5 is a notch provided in the spigot part 4 of the yoke 2; 6 is a rear machine frame that pivotally supports an armature (not shown) and fits with the spigot part 4 of the yoke 2; 6a is a protruding portion of the rear machine frame 6; 7 is a sleeve bearing that is fitted onto the inner peripheral surface of the protruding portion 6a and supports the rotating shaft of the armature;
8 is a notch provided at the open end of the rear machine frame 6;
Reference numeral 9 is a grommet made of a rubber member that fits into the notches 5 and 8, 9a is a through hole provided in grommet 9, and 10 is a lead wire that passes through this through hole 9a and supplies power to a brush (not shown).

In the above configuration, when power is supplied to the armature from the lead wire 10 via the brush, the armature is urged to rotate by receiving the excitation force of the field magnetic pole 3. At this time, the rotation force reaction force of the armature is received by the stator 1.

However, in such a conventional device, since the fixation of the stator 1 and the lid body such as the rear machine frame 6 in the rotational direction is determined by the grommet 9, the elastic deformation of the grommet 9 allows accurate positioning in the rotational direction. There was a drawback that it became difficult.

The present invention was developed in view of these drawbacks, and in order to accurately position the stator and the lid in the rotational direction, the spigot part of the stator is partially bent and a cutout groove is formed in the lid. They are configured to fit together.

Next, one embodiment of the present invention will be described. First, as shown in FIG. 2a, a part of the spigot part 40 of the yoke 20 is bent in the direction of arrow A. As a result, a yoke 20 as shown in FIGS. 2b and 2c is obtained. The end portion of the rear machine frame 6 is fitted into the spigot portion 40 remaining after the above processing. In this case, the bent portion 12 of the spigot portion 40 is positioned and engaged with the notch 8 of the rear machine frame 6 in the rotational direction. Reference numeral 90 denotes a grommet that is engaged at this time and is sealed in the notch 8.

The configuration other than the above is similar to that of the conventional device shown in FIGS. 1a to 1c, and the same parts are denoted by the same reference numerals and the explanation thereof will be omitted.

In this way, the positioning between the yoke 2 and the rear machine frame 6 is secured to each other by a rigid member, resulting in extremely high precision assembly.

In addition, although the case where the positioning mechanism is configured between the yoke and the rear machine frame has been described above, the device of the present invention may be installed between the stator and the lid of the front machine frame or other casing. It is possible to apply.

Further, even if the shape of the spigot part is reversed (the protruding part coincides with the outer circumferential surface), the same effect can be achieved.

As explained above, according to the present invention, a tongue-shaped bent part is provided in the spigot part of the stator, and it fits into a notch provided in the lid body.
The device can be positioned with high accuracy, the pressure in the rotational direction can be reliably received, and it has the advantage of being simple and inexpensive.

[Brief explanation of the drawing]

Figure 1a is a sectional view showing the main parts of the conventional device;
Figure b is a top view showing the main parts of Figure 1a, Figure 1c is a perspective view of the main components before assembly, and Figure 2a is an explanation of the processing procedure for the main components according to an embodiment of the present invention. Figure 2b is a sectional view of the main part of the present invention, Figure 2c
is a perspective view of the main components before assembly. DESCRIPTION OF SYMBOLS 1... Stator, 2, 20... Yoke, 3... Field magnetic pole, 4, 40... Pilot part, 6... Rear machine frame, 8... Notch, 12... Bent part. In addition,
The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a device consisting of a stator of an electric motor and a lid attached to a spigot part arranged on the stator, a tongue-shaped bent part is provided in the spigot part of the stator, and a cutout provided in the lid body is provided. A stator positioning device for an electric motor, characterized in that the notch is configured to fit into the bent portion.