JPH05316696A - Manufacture of outer frame of rotating electric machine - Google Patents

Abstract

PURPOSE:To manufacture an outer frame of a rotating electric machine, whose stator can be cooled efficiently, at low cost. CONSTITUTION:This is the outer frame 23 of a rotating electric machine which is bent in tubular shape out of a steel plate 21 and has, at the periphery, a plurality of bead parts 24, which form gaps for cooling a stator 27 between itself and the iron core 28 of the stator by swelling out from outward to inward, being molded by press processing. The subsequent machine processing of a step 30 can be facilitated or it can be obviated by reforming the openings at both ends in axial direction into the shape of a right circle by the spinning processing of the spinning rollers 25 and 26 after the press processing of bead parts 24 besides being after the bending of its tube.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an outer frame of a rotary electric machine manufactured by sheet metal working.

[0002]

2. Description of the Related Art Conventionally, a rotating electric machine using an outer frame 1 as shown in FIG. 4 has been provided. The outer frame 1 is formed by bending a steel plate into a cylindrical shape and has a plurality of bead portions 2 that bulge inward from the outside in the peripheral portion, which are formed by pressing, in particular, embossing. The iron core 4 of the stator 3 is press-fitted into the inner periphery of the two portions, and therefore the outer peripheral surface of the stator iron core 4 and the bead portion 2 of the outer frame 1 are
A gap 5 is formed between the inner peripheral surface and the other portion.

Further, step portions 6 and 7 are formed on the inner circumferences of the openings at both axial ends of the outer frame 1 after the bead portion 2 is formed. The shaft portions 9 of the rotor 8 are formed on the step portions 6 and 7. Bearing 1
Bearing brackets 12 and 13 supported by 0 and 11 are fitted.

Fans 14 and 15 are attached to the rotor 8, and the cooling air generated by the fans 14 and 15 is caused to flow through the gap 5 so that the iron core 4 and the coil 16 of the stator 3 are provided. Is effectively cooled.

[0005]

However, in the rotary electric machine outer frame 1 as described above, when the bead portion 2 is pressed (embossed), openings at both axial ends of the outer frame 1 are formed. The parts are distorted, which results in steps 6, 7
Since it becomes difficult to process and form the resin into a perfect circle, the manufacturing cost increases.

The present invention has been made in view of the above circumstances. Therefore, an object of the present invention is to provide an outer frame of a rotating electric machine capable of effectively cooling a stator at a low cost. A frame manufacturing method is provided.

[0007]

In order to achieve the above object, in the method for manufacturing an outer frame of a rotary electric machine of the present invention, a steel plate is bent into a cylindrical shape and bulges outward from the outside to the inside. A rotary electric machine outer frame having a plurality of bead portions formed by press working, wherein after the cylindrical bending and after the bead portion is pressed, the openings at both axial ends are formed into a perfect circle by spinning. It is characterized in that the shape is corrected.

[0008]

According to the above means, after the cylindrical bending of the outer frame of the rotating electric machine and after the pressing of the bead portion, the openings at both axial ends of the outer frame are straightened by spinning. As a result, the subsequent machining of the step can be facilitated without the distortion of the outer frame opening, or even eliminated.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

First, FIG. 1A shows a material 21 for an outer frame of a rotating electric machine, which is made of a flat steel plate. The material 21 is bent into a cylindrical shape as shown in (b), and the mating portion 22 is welded and fixed to form a cylindrical outer frame 23.

Next, in the peripheral portion of the cylindrical outer frame 23,
As shown in (c), a plurality of bead portions 24 that bulge from the outside to the inside are formed by press working, especially embossing.

Then, as shown in (d), the openings at both axial ends of the outer frame 23 are processed by spinning. As shown in FIG. 2, this processing is performed by rotating the outer frame 23 by a drive device (not shown) (arrow A), and opening the axially opposite ends of the rotating outer frame 23 from outside (from above). , The spinning rollers 25 and 26 are pressed (arrow B), and the spinning rollers 25 and 26 are driven to rotate (arrow C) and reciprocally moved in the axial direction (arrows D and E). Thus, the openings at both axial ends of the outer frame 23 are straightened.

Thereafter, as shown in FIG. 1 (e), the stator 27 is inserted into the outer frame 23, and the iron core 28 of the stator 27 is pressed against each inner surface of the bead portion 24.

Then, as shown in (f), step portions 29 and 30 are formed on the inner circumference of the opening portions at both axial ends of the outer frame 23.

Although not shown, the outer frame 23 thus manufactured is fitted with a bearing bracket for supporting the shaft of the rotor by bearings in the step portions 29 and 30, as in the conventional case. Further, a fan is attached to the rotor, and the cooling air generated by the fan is supplied to the outer peripheral surface of the stator core 28 and the outer frame 23 by the bead portion 24.
The iron core 28 and the coil 31 of the stator 27 are effectively cooled by flowing through the gap between the inner peripheral surface of the portion other than the bead portion 24.

As described above, according to this method, after the cylindrical bending of the outer frame 23 of the rotary electric machine and after the press working of the bead portion 24, the opening portions at both axial ends of the outer frame 23 are subjected to the spinning processing. To correct it into a perfect circular shape, so that the subsequent machining of the step portions 29, 30 is performed by the outer frame 2
3 It can be easily done without being annoyed by the distortion of the opening. Thus, according to this method, the rotating electrical machine outer frame 23 capable of effectively cooling the stator 27 can be manufactured at low cost.

In contrast to the above, FIG. 3 shows a second embodiment of the present invention, and if only the differences from the first embodiment are described, the bead portion is provided around the cylindrical outer frame 23. After molding 24 (c), the stator 27 is inserted into the outer frame 23 thereof, the iron core 28 of the stator 27 is pressed against each inner surface of the bead portion 24 (d), and thereafter, The openings at both axial ends of the frame 23 are processed by spinning (e), and the outer frame 2
Steps 29 and 30 are formed on the inner circumferences of the openings at both ends of the shaft 3 in the axial direction.

In this case, after the stator 27 is press-fitted into the outer frame 23, the openings at both axial ends of the outer frame 23 are processed by spinning, so that the stator 27 is press-fitted into the outer frame 23. Even if the openings at both ends in the axial direction are distorted, it can be corrected by the subsequent spinning process. Therefore, the roundness of the openings at the ends in the axial direction of the outer frame 23 can be made more than that in the method of the first embodiment. It is easy to take out, and the steps 29 and 30 can be formed more easily. Further, in this case, if the circularity of the openings at both axial ends of the outer frame 23 is sufficiently large, the stepped portions 29 and 30 are omitted, and the bearing brackets are directly fitted into the openings at both ends. It may be done.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, but may be appropriately modified and implemented without departing from the scope of the invention.

[0020]

As is apparent from the above description, the method of manufacturing the outer frame of the rotating electric machine according to the present invention is provided with a plurality of bead portions which are bent in a cylindrical shape by a steel plate and bulge from the outside to the inside. In a rotating electrical machine outer frame having a molded by
After the cylindrical bending and after pressing the bead portion, the openings at both ends in the axial direction are corrected into a perfect circle by spinning.
As a result, the rotating electric machine outer frame capable of effectively cooling the stator can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a process chart showing a first embodiment of the present invention.

FIG. 2 is a cutaway side view showing a state of a spinning process of the embodiment.

FIG. 3 is a process chart showing a second embodiment of the present invention.

FIG. 4 is a cutaway side view of an entire rotary electric machine showing a conventional example.

[Explanation of symbols]

Reference numeral 21 denotes an outer frame material (steel plate), 23 denotes an outer frame, 24 denotes a bead portion, 25 and 26 denote spinning rollers, and 29 and 30 denote step portions.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobuhiro Aikura, Inventor Shinken Aikura 2121 Nobuo, Asahi-cho, Mie-gun, Mie Prefectural Mie Factory, Toshiba Corporation (72) Toyonobu Yamada 2121 Sayo, Asahi-cho, Mie-gun, Mie Bashi Co., Ltd. Toshiba Mie Factory

Claims (1)

[Claims] 1. A rotary electric machine outer frame having a plurality of bead portions which are bent in a cylindrical shape by a steel plate and which are bulged outwardly from the outside in a peripheral portion by press working, after the bending of the cylindrical shape. A method of manufacturing an outer frame of a rotating electrical machine, characterized in that after pressing the bead portion, the openings at both ends in the axial direction are straightened by spinning.