JPS58174716A - Bearing device of rotary electrical equipment - Google Patents

Abstract

PURPOSE:To simplify structure by providing, in the peripheral direction of an axis of rotation, the plural sets of rotary boards slanting to the axis of rotation and bearings which support said boards in the slanting direction and forming the device so as to support downward thrust load and radial load. CONSTITUTION:The under surface of a rotary board 10 fixed slantingly to an axis of rotation 1 is supported by means of a bearing 11 to stop an axially downward thrust load and a radial load of the axis of rotation 1. The plural number of such bearing parts are provided in the peripheral direction. By this composition, downward thrust load and radial load can be supported by means of a single bearing 11 and structure of the captioned device can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bearing device for a rotating electrical machine that rotatably supports a rotating shaft.

A conventional device of this type is shown in FIG. In the figure, (1) is, for example, the rotating shaft of a water turbine generator, (
2) is a rotating plate fixed to this rotating shaft (1).

(3) is located on the bottom surface of this rotating plate (2), and the rotating shaft (1
) with an appropriate gap between the rotating shaft (1)
(4) is a support stand that supports this thrust bearing (3), (5) is this support stand (4). ), the pivot is attached to (
6) is a plurality of guide bearings that receive and stop the radial load of the rotating shaft (1), (7) is a support ring that supports this guide bearing (6), and (8) is a support ring within this support ring (7). Provided on the peripheral surface,
The push bolt (9) in contact with the guide bearing (6) is a bearing oil tank that accommodates these (2) to 8), and stores lubricating oil (not shown).

Next, the operation will be explained. The thrust bearing (3) receives and stops the downward thrust load in the axial direction of the water pressure acting on all the rotating parts of the water turbine (not shown), the generator, the exciter, and other water pressure acting on the water turbine blades. The guide bearing (6) supports the radial load of the rotating part.If the rotating part is perfectly balanced and the rotating axis +11 is vertical, there is theoretically no radial load, and the guide bearing (6) supports the radial load of the rotating part.
) can act as a guide. However, as a practical matter, the center of the rotating shaft (1) and the center of gravity of the rotating part do not completely coincide, so that unbalance inevitably occurs.

Therefore, the guide bearing (6) stops receiving the radial load associated with the unbalance.

However, in the conventional bearing device described above, the rotating shaft (1
) and the radial load of the rotating shaft (1) are supported by the thrust bearing (3) and the guide bearing (6), respectively, making the structure complicated and expensive.

In addition, there are drawbacks such as large losses due to the proportion of both bearings in the bearing oil tank (9) and the large portions immersed in oil. Further, since the thrust bearing (3) is arranged horizontally, there is a drawback that air bubbles in the oil flow are trapped and cause damage to the bearing.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by supporting the downward axial thrust load of the rotating shaft and the radial load of the rotating shaft with a single bearing, the structure can be improved. The aim is to provide a simple and inexpensive bearing device.

Hereinafter, one embodiment of the present invention will be described based on FIG. 2. In the figure (1), (4), (5), (
9) is similar to the configuration of the conventional device described above. αQ is a rotating plate tilted and fixed to the rotation axis +11, α■ is located on the lower surface of this rotating plate 00 and is arranged on a line perpendicular to the lower surface of the rotating plate αQ, in the axial direction of the 1 rotation axis (1) Receives the downward thrust load and the radial load of the rotating shaft ill 1
Rotating part (11) is rotatably supported and is a plurality of bearings arranged in the circumferential direction.

In the bearing device of the present invention, the downward axial thrust load of the rotating shaft (1) is handled by the vertical component of the supporting force of the bearing αυ.
The radial load of the rotating shaft +11 is supported by the radial component of the supporting force of the bearing αυ. That is, one bearing 01) receives and stops the thrust load and the radial load, and rotatably supports the rotating shaft (1). Moreover, since the bearing 0υ is inclined as shown in FIG. 21, even if air bubbles are caught in the oil flow, the air bubbles are likely to come out. Therefore, factors that cause bearing damage can be eliminated.

As described above, the device is simple, can be manufactured at low cost, and is easy to maintain. Additionally, the area of rotating parts and bearings immersed in oil is reduced, resulting in less loss.

As described above, according to the present invention, the rotating plate is fixed to the rotating shaft at an angle, and the bearing that supports the rotating shaft is located on the lower surface of the rotating plate and is arranged on a line perpendicular to the lower surface of the rotating plate. Since the downward axial thrust load of the rotating shaft and the radial load of the rotating shaft are supported by one bearing, it is possible to obtain a bearing device with a simple structure and low cost.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional side view showing a conventional rotating electric machine bearing device.
FIG. 2 is a sectional side view showing a bearing device for one rotating machine according to an embodiment of the present invention. In the figure, 11) is the rotating shaft, QO is the rotating plate, and αυ is the bearing. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Shin Kuzuno - Figure 1 Figure 2

Claims (1)

[Claims] A rotary plate tilted and fixed to the rotary shaft, located on the lower surface of the rotary plate and arranged on a line perpendicular to the lower surface of the rotary plate, and a thrust load directed downward in the axial direction of the rotary shaft and a radius of the rotary shaft. A bearing device for a rotating electric machine, which supports a directional load, rotatably supports the rotating shaft, and includes a plurality of bearings arranged in a circumferential direction.