JPS6026514Y2 - Thrust bearing device for electric motor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a thrust bearing device for an electric motor suitable for a submersible electric motor.

A conventional submersible electric motor has a rotor 9 as shown in FIG.
A disk-shaped thrust bearing 16 that supports the thrust load in the axial direction is fixed to the inner end of the cast metal bracket 6 with an adhesive or the like.
In order to make full contact with the thrust disk 14 on the rotor shaft 10, both must be assembled parallel to each other. It is also necessary to remove right angle dust from the mounting surface 10A of the thrust disk 14 on the rotor shaft 10.

Therefore, machining and assembly require high precision, resulting in high manufacturing costs.

Further, if the thrust disk 14 hits the thrust bearing 16 unevenly, there is a risk that the disk may seize if a thrust load is applied.

This invention was made to eliminate the above-mentioned drawbacks, and includes a bracket having a cylindrical part that supports the end of the rotor shaft having a thrust disk, and a ring part fitted to the outer periphery of the cylindrical part of this bracket. and a plurality of recesses formed on the same circumference on a surface facing the thrust disk, and an elastic body surrounding the rotor shaft; It is an object of the present invention to provide a thrust bearing device for an electric motor that has a plurality of pads that make surface contact with a thrust disk, thereby improving self-aligning action and making assembly extremely easy.

An embodiment of this invention shown in the figure will be described below.

In Fig. 2, 1 is a stator, 2 is a stator coil, 3 is an outer cylinder made of stainless steel, 4 is a thin inner cylinder made of stainless steel that passes through the inner circumference of the stator 1, and 5 is an annular end plate. Its inner and outer circumferences are fixed to the inner cylinder 4 and outer cylinder 3 by welding.

6 and 6' are cast metal brackets fixed to the end plate 5 with bolts 7, and have cylindrical bosses 6At and 6A' that protrude into the inner cylinder 4.

8 is a seal packing.

9 is a rotor inserted into the inner cylinder 4, and both ends of the rotor shaft 10 are supported by the cylindrical bosses 6A and 6A' of the bracket 6.6' through sleeve bearings 11. .

12 is a disc-shaped elastic body made of synthetic leather rubber, etc.
One side has a ring part 12A that fits into the tip step part 6B of the cylindrical part 6A of the bracket 6, and the other side has a third ring part 12A.
As shown in the drawings and FIG. 4, four arcuate recesses 12B are molded.

Reference numeral 13 denotes a carbon pad whose half part is buried in the recess 12B of each elastic body 12, and has an arc shape as shown in FIG.
It is approximately twice the depth of

14 and 14' are stainless steel thrust disks fitted onto the rotor shaft 10, and 15 is an anti-thrust bearing.

Thus, the thrust load of the rotor shaft 10 is received by the bracket 6 via the thrust disk 14, pad 13, and elastic body 12.

Although the above embodiment has been described in which the pad 13 serving as a thrust bearing is made of carbon, the pad 13 may be made of metal such as stainless steel, and the thrust disk 14 may be made of a solid lubricant such as carbon.

As described above, this device is constructed by fitting a pad for supporting a thrust disk into the recess of an elastic body that has one side fixed to the inner boss end of the bracket and a molded recess on the other side. The mounting surfaces of brackets and rotor shafts can be manufactured easily and inexpensively, and the self-aligning effect of the elastic force of the elastic body allows for good thrust load support. Since it is made up of pads that have been polished, it also has the effect of better conforming to the thrust disk.

In addition, the elastic body is provided with a ring part fitted to the outer periphery of the cylindrical part of the bracket, and a plurality of recesses formed on the same circumference on the surface facing the thrust disk, and the pad is inserted into the recesses. Therefore, multiple bands can be handled together with the elastic body, and during assembly, all that is required is to assemble the pad to the elastic body as a completed product, and then attach this completed product to the cylindrical part of the bracket. This has the effect of making it extremely easy.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional electric motor partially shown in cross section, Figs. 2 to 5 relate to an embodiment of this invention, Fig. 2 is a front view of the electric motor partially shown in cross section, and Fig. 3 is a front view of the electric motor partially shown in cross section. is a front view of the elastic body, FIG. 4 is a cross-sectional view taken along the TV-IV line in FIG. 3,
FIG. 5 is a front view of the pad. Note that the same reference numerals in the figures indicate the same parts. 6.6'... Bracket, 10... Rotor, 12... Elastic body, 12B... Concavity, 13... Pad, 14.14' thrust disk.

Claims (1)

[Scope of utility model registration request] A bracket having a cylindrical portion that supports an end of a rotor shaft having a thrust disk; a ring portion disposed between the thrust disk and the end surface of the cylindrical portion and fitted to the outer periphery of the cylindrical portion of the bracket; and a plurality of recesses formed on the same circumference on a surface facing the thrust disk, the surface opposite to the surface being in contact with the end surface of the cylindrical portion, and the rotating surface at the center. A thrust bearing device for an electric motor, comprising an elastic body through which a child shaft is inserted, and a plurality of pads each inserted into a plurality of recesses of the elastic body and in surface contact with the thrust disk.