JPS5939977B2 - Rotating body of rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating body of a rotating electrical machine, and more particularly to a rotating body having a ring on a rotating shaft that rotates together with the rotating shaft.

Conventionally, as shown in FIG. 1, the load-side bearing portion of a DC machine, for example, includes a rotating shaft 1, a bearing 2 provided on the rotating shaft 1, a pedestal 3, and a rotating shaft disposed within the pedestal 3. It is composed of a rotating ring 4 fixed to a shaft, an oil paddle 5, etc., and an oil drain fitting 6 at both ends.
, 6 are provided respectively.

This pedestal 3 is fixed onto a base 7.

The aforementioned rotating ring 4 has a structure in which the F-most part is immersed in the oil inside the pedestal, and the oil adhering to the rotating ring 4 rotates together with the rotating ring 4, and is removed by the oil paddle 5 provided at the top. The oil is led to the oil reservoir 8 of the bearing 2 and enters between the bearing 2 and the rotating shaft 1 through the hole 9 of the bearing 2 to perform a lubricating action.

Details of the rotary ring 4 portion in FIG. 1 are shown in FIG. 2, details of the rotary shaft 1 in that portion are shown in FIG. 3, and details of the rotary ring 4 are shown in FIG. 4, respectively.

In this case, due to the structure of the bearing, it is necessary to provide a gap G between the rotating ring 4 and the mounting diameter end surface X of the bearing 2 of the rotating shaft 1.

In order to ensure this gap G and facilitate the work, the rotating shaft 1 is provided with a stop portion C for the rotating ring 4.

Torsional stress is generated in each part of the rotating shaft 1 due to the transmitted torque T.

In the stepped part, (actual stress) = (nominal stress)
x stress concentration factor) is a known fact.

It is a known fact that the stress concentration coefficient depends on the diameter, the step, and the curved surface of the corner of the stepped portion, and that the curved surface of the corner of the stepped portion in particular accounts for a large weight.

In FIG. 3, the maximum diameter φ of the rotary shaft 1 is limited by the dimensions of the shaft material, etc., and it is difficult to create a large step between it and the insertion diameter φ2 of the rotary ring 4.

For this reason, the radius of the corner curved surface of the stepped portion must also be made small.

Therefore, the stress concentration coefficient at the hollow part in the figure becomes a dog, and the actual stress at the D part becomes larger than the actual stress at the E part, where the curved surface with a large radius can alleviate the stress concentration, and the rupture occurs from this D part. The problem is that there are things you can do.

The present invention solves the above-mentioned conventional difficulties and provides a rotating body of a rotating electric machine in which stress concentration on the rotating shaft is small by increasing the radius of the corner curved surface of the stepped portion without increasing the diameter of the rotating shaft. purpose.

The present invention focuses on the fact that in order to alleviate the stress concentration on the rotating shaft, it is sufficient to eliminate the step or increase the radius of the corner curved surface of the stepped section. In addition to providing it on the ring side, a medium diameter shaft having a large radius of the corner curved surface of the stepped portion is provided on the rotating shaft side.

The present invention will be explained below with reference to an embodiment shown in FIGS. 5 to 7.

FIG. 5 shows a main part of an embodiment of the present invention corresponding to FIG. 2, FIG. 6 shows its rotating shaft 1, and FIG. 7 shows its rotating ring 4.

The journal portion of the rotating shaft 1 is composed of a small diameter shaft φ4, a medium diameter shaft φ3 and a large diameter shaft φ5 continuous to the small diameter shaft φ4.

The corner curved surface radius of the stepped portion between the small diameter shaft φ4 and the medium diameter shaft φ3 and the corner curved surface radius of the stepped portion between the medium diameter shaft φ3 and the large diameter shaft φ5 are each set to be large. ing.

This stepped portion is configured so as not to hinder the rotation of the rotating ring 4, which will be described later.

The rotating ring 4 is formed into a substantially annular plate shape, and a stepped portion F is provided on the inner peripheral surface thereof, and a stop portion of the rotating ring 4 is formed in this portion.

As shown in FIG. 5, the rotating ring 4 is locked to the large diameter shaft φ5 so that the stepped portion F is disposed at the end of the large diameter shaft φ5 on the medium diameter shaft φ3 side.

In this way, the gap G is secured as in the conventional case.

As explained above, according to this embodiment, the stop portion for ensuring the gap G is provided as a stepped portion F on the rotary ring 4, and there is no need to step the large diameter shaft φ5.

Therefore, there is no stress concentration in this part.

In addition, each stepped portion of the journal is provided with a curved surface with a large radius, which alleviates stress concentration.

Although the present invention has been described above based on preferred embodiments, according to the present invention, stress concentration can be alleviated.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the load side bearing of a DC machine in the prior art, Figure 2 is an enlarged sectional view of its main parts, Figure 3 is a view of the main parts of the rotating shaft in Figure 2, and Figure 4 is the same rotating shaft. Cross-sectional view of the ring, No. 5
The figure is a sectional view showing one embodiment of the present invention, FIG. 6 is a view of the main part of the rotating shaft of FIG. 5, and FIG. 7 is a sectional view of the rotating ring. 1...Rotating shaft, 4...Rotating ring, F...Step part,
φ4 small diameter shaft, φ3...medium diameter shaft, φ5...large diameter shaft.

Claims (1)

[Claims] 1. In a rotating body of a rotating electrical machine in which a journal is formed from a small diameter shaft and at least two stages of large diameter shafts continuous to the small diameter shaft, and a rotating ring is arranged on the large diameter shaft, the small diameter shaft and the large diameter shaft A medium-diameter shaft is provided between the stepped portions, and the radius of the corner curved surface of these stepped portions is large, and a stepped portion is provided on the inner circumferential surface of the rotary ring, and this stepped portion is locked to the end of the large-diameter shaft. A rotating body of a rotating electric machine characterized by being arranged in the following manner.