JPS6155328B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator device for a frameless rotating electric machine having a laminated iron core that is dimensionally and precisely forged by cold pressing.

In one method for manufacturing a stator device of this type according to German Patent Application No. 2344193, a blank stator body consisting of at least tightly assembled stator core pieces is smoothed beforehand. The inner and outer edges of the stator are chamfered, and the stator is cold-worked to form a stator that is accurate both in size and shape, and then fastened. The stamp head includes a laminated core formed by a heading process without cutting, and has protruding outer edges on mutually facing sides so that the core has annular mounting surfaces on both sides. .

A stator arrangement for a frameless electric motor is likewise known from German Patent Specification No. 844,616. In this case, the laminated core of the stator device has a groove in the end plate of the laminated core, which is polished so that the surfaces are parallel after lamination of the reinforced laminated core, instead of an alignment rim cut out on a lathe. A plurality of independent centering points are created by pressing shaped holes. The protrusion pushed into it engages with the bearing bracket, thereby bringing the bearing bracket, which is coupled to the side surface of the laminated core, concentric with the inner hole of the laminated core.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to form a stator device for a frameless rotating electrical machine having a bearing bracket coupled to a laminated core with ease in terms of manufacturing and assembly techniques.

According to the present invention, such an object is achieved in a frameless rotating electric machine having a bearing bracket and a laminated core, in which the laminated core itself is fastened by a fastening means,
Forging a plurality of indentations distributed around both side surfaces of the laminated core and having flat locking surfaces so that each side surface is on the same plane and parallel on both side surfaces,
This indentation portion is adjacent to the fastening means in the circumferential direction,
A supporting surface that abuts the indentation portion is protruded from a side surface of a bearing bracket that axially sandwiches the laminated iron core, and an alignment rim that contacts the radially outer side of the laminated iron core other than the area of the indentation portion is provided. This can be achieved by doing so.

According to the present invention, the bottom surface of the indentation on one side of the laminated core has a constant axial spacing with respect to that on the other side, so that the bottom surface of the indentation on one side of the laminated core has a constant axial spacing, and therefore, the bottom surface of the indentation on one side of the laminated core has a constant axial spacing, so that the bottom surface of the indentation on one side of the laminated core has a constant axial spacing. The laminated cores are pre-fastened, for example during the machining process, so as to form a locking surface for the supporting surfaces that are at the same level and to ensure that the bearing brackets connected to the laminated cores remain parallel to each other. The four stamping heads acting on both sides of the laminated core simply make it possible to forge four indentations in the axial direction in the laminated core.

When looking at the periphery of a laminated core, it is found that the length of the laminated core varies in the axial direction after the core is laminated and pre-fastened, based on the dimensional error of the individual core pieces and, in some cases, their condition. Therefore, even in the laminated core of the stator device of the present invention, in locations with larger positive dimensional errors,
It must be recognized that the locking surface of the indentation is forged deeper than in locations with smaller positive dimensional tolerances or in locations with negative dimensional tolerances.

The laminated core is axially superimposed on the bearing bracket such that the bearing bracket is coupled concentrically to the laminated core with respect to its inner bore, and the bearing bracket is radially outwardly of the laminated core outside the area of the indentation. Create an adjacent alignment rim in the form of a collar.

Next, the details of the invention will be explained based on the embodiments shown in the outline part of the drawings.

FIG. 1 shows a side view of the stator laminated core 3 which has been laminated and pre-fastened, and FIG. 2 shows a bird's eye view thereof. The core pieces to be laminated for preliminary fastening of the stator laminated core 3 are tightened by four rivets 5 distributed around the core pieces, penetrating the core pieces, and having their heads pressed on both sides of the core. be done. The laminated core 3 is also directly forged in the axial direction by a stamp head, and has four indentations 31, 32, 33, 34 or 36, 3 distributed around the periphery of both sides.
7, 38, and 39 (butters 31 and 34 are omitted in the illustration). In FIG. 1, there are indentations 32, 33 on the upper end of the laminated core 3, indentations 37, 38, 39 on the lower end, and a second bird's eye view of the laminated core 3 with the bearing bracket 1 removed. In the figure, indentations 36, 37, 3
8,39 is accepted. In the illustrated embodiment, these indentations are semicircular with outward opening, but instead of such a semicircular centering surface, any other suitable shape may be used. It is also possible to have the following.

In particular, as is clear from FIG.
2, 33, 34 or 36, 37, 38, 39
The locking surface 321, 3 of the upper side surface formed by
31, 341, 351 and the locking surface 36 on the lower side surface
1,371,381,391, the bearing brackets 1 and 2 on both sides have support surfaces built corresponding to the above-mentioned locking surfaces, that is, 11, 12, 13, 14 for the upper bearing bracket, The lower bearing bracket is also contacted by 21, 22, 23, and 24. The bearing brackets are also connected to each other and to both ends of the stator laminated core by means of a method not shown in detail here, using bolts passing axially over the laminated core and through holes 6 and 7 in the bearing bracket. The locking surface of the impression portion is tightened against the surface.

Further, as seen in FIG. 1, the locking surface on one side of the laminated core 3 has the same height h over the entire circumference as compared to the locking surface on the other side. On the other hand, since the bearing brackets 1 and 2 are on the same level in the axial direction, the result is that the bearing bracket 1 connected to the laminated core as mentioned above
and 2 are aligned so as to maintain parallel positions to each other.

In order to align and fix the bearing brackets 1 and 2 concentrically with respect to the inner bore 4 of the laminated core, the bearing brackets 1 and 2 are then fitted with alignment rims 15 and 25 in the form of collars. These rims 15 and 25 cover the laminated core by a short distance in the circumferential direction on both end faces, and indentations 31, 32, 33,
Areas other than 34, 36, 37, 38, and 39 are adjacent to the outside of the laminated core. This is particularly evident from the non-sectional side views of the bearing bracket of the roll-out section in FIGS. 2 and 1. According to FIG. 2, the alignment rim 2 of the bearing bracket 1 is shown separately in that part.
5 is interrupted at the indentations 36, 37, 38, 39. As a result, the alignment rim formed as a collar does not touch the outer periphery of the laminated core in these parts. This is because, in some cases, the laminated core may be expanded in the radial direction by a small amount at the indentation portion due to the forging process when making the indentation portion.

Centering rims 15 and 25 in the area of the impression
As the bearing bracket is interrupted, the collar can contact the outside of the laminated core and provide concentric fixation of the bearing bracket.

In the embodiment described above, the laminated core 3 is pre-fastened by riveting. On this occasion,
Indentations 31, 32, 33, 34 and 36, 3
7, 38, and 39 are preferably provided near the rivet 5 used for preliminary fastening and tightening of the laminated core 3. Also, instead of riveting, other known means such as clamping or welding may be used to tighten the core pieces.

As explained above, in a frameless rotating electric machine having a bearing bracket and a laminated core, the laminated core itself is fastened by a fastening means, and the laminated core has flat locking surfaces distributed around both sides of the core. A plurality of indentations are forged so as to be coplanar on each side surface and parallel to each other on both sides, and the indentations are adjacent to the fastening means in the circumferential direction, and the above-mentioned indentations are formed on the side surfaces of a bearing bracket that axially sandwiches the laminated iron core. A frame having a bearing bracket that is coupled to a laminated core by providing a protruding support surface that abuts the indentation part and an alignment rim that contacts the radially outward part of the laminated core other than the area of the indentation part. This has the effect of making it possible to easily form the structure of the stator device of a less rotating electric machine in terms of manufacturing technology and assembly technology.

[Brief explanation of the drawing]

FIG. 1 shows a side view, partially in section, of a stator device of the present invention comprising a laminated core and bearing brackets attached to both sides of the stator device. FIG. 2 also shows a bird's eye view of the apparatus of FIG. 1 with the upper bearing bracket removed. 1, 2: Bearing bracket, 3: Laminated core, 4:
Inner hole of laminated core, 5: Rivet, 12, 22: Supporting surface of bearing bracket, 15, 25: Aligning rim, 32, 37: Indentation part of laminated core, 321, 3
71: Locking surface of laminated core.

Claims (1)

[Claims] 1. In a frameless rotating electrical machine having a bearing bracket and a laminated core, the laminated core itself is fastened by a fastening means, and a plurality of indentations having flat locking surfaces distributed around both sides of the laminated core are formed on each side. The bearing bracket is forged in the same plane and parallel to each other on both sides, and the indentation part is adjacent to the fastening means in the circumferential direction, and a support surface that abuts the indentation part is provided on the side surface of a bearing bracket that sandwiches the laminated iron core in the axial direction. 1. A stator device for a frameless rotating electric machine, characterized in that an alignment rim is provided that projects and contacts the radially outer side of a laminated iron core other than the area of the impression portion.