JPS59294B2 - How to form a yoke for an electric motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method of connecting end faces of a yoke for a motor.

Conventionally, this type of connection has been shown in FIGS. 1 and 2.

In FIG. 1, 1 is a yoke of an electric motor.

In FIG. 2, 1a and Ib are end faces of the yoke, and a portion of the abutting portion of each end face is cut out in a tapered shape. 2 is a welding material for joining these end faces.

Next, the connection will be explained.

The end faces 1a and Ib of the yoke 1 are formed as shown in Fig. 2. After the yoke 1 is formed into a cylindrical shape from sheet metal, the end faces 1a and lb are butted against each other, and a recess is formed in the upper part of the butt part. The conventional connection between the end faces 1a and Ib of the yoke 1 is performed as described above, by melting the welding material 2, welding it, and fixing it.
In this method, the welding material 2 is melted using electricity, gas, etc. to connect the end faces 1a and Ib, so the processing process is separate from the press forming process, and the welding material 2 is also used, so it is not expensive. I was getting used to it. This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and includes a concavo-convex fastening portion formed in a portion of each end face of the yoke and capable of fitting into each other, and a convex-concave fastening portion that can be fitted into each other. Flat parts are formed in series and can be brought into close contact with each other by fitting the respective fastening parts, and each end face of the yoke is fixed by caulking with the uneven parts of the respective fastening parts, and the flat parts are made waterproof by the close contact with each other. The purpose of this invention is to provide an inexpensive and reliable method for forming a yoke for a motor.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

In FIGS. 3 and 4, Ic and Id are the end faces of the yoke 1, and 3 and 4 are fastening parts formed on a part of these end faces, which are formed in an uneven shape, and the fastening parts 3 and 4 are formed in a concave and convex shape. The grooves are alternately formed so that they can be fitted. Reference numerals 5 and 6 denote flat parts formed in continuation with these tightening parts 3 and 4.
and are brought into close contact with each other by fitting.

Also, the wall thickness tl of the above-mentioned mutual tightening parts 3 and 4 is equal to the above-mentioned end face Ic.
, ld are set to approximately half the thickness of the two, and the end faces of the two end faces are fitted to each other so that they are on the same plane. Next, the connection will be explained.

As shown in FIG. 4, after the yoke 1 is formed into a cylindrical shape from a plate material, the end surfaces lc and ld of the yoke 1 are fitted together, and the tightening portions 3 and 4 of the concave and convex portions of each other are fitted. is calmed down.
At the same time, the flat parts 5 and 6 are also brought into close contact with each other, and the respective end faces lc and Id are fixed. Therefore, in this embodiment, since welding is not required, there is no need to use welding material or welding equipment, and the cost is reduced.
, 1d, the connection means is extremely easy. Furthermore, since the flat parts 5 and 6 are brought into close contact with each other, airtightness is maintained when the motor is assembled into the motor, and water can also be prevented from entering the motor. As described above, in the present invention, on each end face of the plate material, uneven joints are formed in a part of the end face and can be attached to each other. A flat part is provided, and each end face is fixed by caulking with the uneven parts of the joint part, and the flat part is made to be waterproof by adhering to each other, so complicated welding methods are not required. Therefore, it can be manufactured easily and inexpensively, and when assembled into an electric motor, it can have an airtight structure, and a highly accurate electric motor can be obtained.

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional yoke, Fig. 2 is an enlarged sectional view of the main parts of a conventional yoke, Fig. 3 is a front view of an embodiment of the present invention, and Fig. 4 is a front view of a conventional yoke. FIG. 1 is an enlarged sectional view showing a main part of an embodiment of the present invention.

Claims (1)

[Claims] 1. In a motor yoke formed by bending a plate material into a cylindrical shape and connecting the bent end faces thereof, each end face of the plate material has a convex-concave shape that is formed in a portion thereof and that can fit into each other. joint portions, and flat portions that are respectively formed in connection with these joint portions and can be brought into close contact with each other by fitting the respective joint portions,
A method for forming a yoke for an electric motor, characterized in that each of the end faces is caulked and fixed by the uneven portions of each of the joint portions, and the flat portions are brought into close contact with each other to provide waterproofness.