JPH028530Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a bearing device for a vertical rotating machine.

FIG. 1 is a partial side sectional view showing a conventional bearing device for a vertical rotating machine. In Figure 1, frame 1
The frame forms the frame of the vertical rotating machine, and is formed into a cylindrical shape. A fixed iron core 2 is attached to the inner peripheral surface of the frame 1, and a field winding 3 is provided thereon. The rotating shaft 4 is inserted into the frame 1 along the central axis of the frame 1. The upper bracket 5 covers the upper end of the frame 1 and rotatably supports the upper part of the rotating shaft 4 via an upper bearing 6. The upper bearing covers 7 and 8 are attached to the upper bracket 5.
It covers the upper end surface and the lower end surface of the upper bearing 6 housed in the upper bracket 5. The lower bracket 9 covers the lower end of the frame 1 and rotatably supports the lower part of the rotating shaft 4 via a lower bearing 10. The lower bearing cover 11 covers the upper end surface of the lower bracket 9 and covers the lower bearing 10 housed within the lower bracket 9.

Next, the operation will be explained. The inner ring 601 of the upper bearing 6 is fixed to the rotating shaft 4, the outer ring 602 is attached to the upper bracket 5, and the upper bearing cover 7,
8, and the upper bearing 6 receives thrust in both upward and downward directions. On the other hand, the inner ring 101 of the lower bearing 10 is fixed to the rotating shaft 4,
The outer ring 102 is attached to the lower bracket 9, and between the outer ring 102 and the lower bracket 9,
Further, there is a gap between the outer ring 102 and the lower bearing cover 11, so that the lower bearing 10 can move in the axial direction. The lower bearing 10 also serves as a guide bearing to prevent the rotating shaft 4 from wobbling laterally.

The conventional device is configured as described above, and the upper bearing 6 needs to have a structure that can receive thrust in both the upward and downward directions.If the thrust values in both the upward and downward directions are large, the structure of the upper bearing 6 must be made large. The need arose. Moreover, unless the structure of the upper bearing 6 is made larger, there is a drawback that the permissible value of thrust in both the upward and downward directions becomes small.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and the lower bearing 10
An object of the present invention is to provide a bearing device for a vertical rotating machine in which the upper bearing 6 does not have to take upward thrust into consideration by having a structure that can receive upward thrust, and the structure of the upper bearing 6 can be simplified. It is said that

An embodiment of this invention will be described below with reference to the drawings. FIG. 2 is a partial side cross-sectional view showing one embodiment of a bearing device for a vertical rotating machine according to this invention. FIG. 3 is an enlarged view of the main part of FIG. 2. In the figure, the same parts as in FIG. 1 are given the same reference numerals. In FIGS. 2 and 3, the grease removal ring 12 is mounted on the rotary shaft 4 within the lower bracket 9. As shown in FIGS. The inner ring 101 of the lower bearing 10 is mounted on the rotating shaft 4 and is fixedly sandwiched between the stepped surface 401 of the rotating shaft 4 and the upper end surface of the grease removal ring 12.
On the other hand, the outer ring 102 is attached to the lower bracket 9, and is installed so that there is a minute gap of about 0 to 0.3 mm between its upper end surface and the lower bearing cover 11, as shown by dimension A.
It is installed with a gap of about 2 to 3 mm between the stepped surfaces 901, and is configured to be able to freely slide downward.

This invention is constructed as described above, and the lower bearing 9
The outer ring 102 is made to be able to slide freely in the vertical direction, but when an upward thrust is applied to the rotating shaft 4, the upper end surface of the outer ring 102 is in contact with the lower bearing cover 11, so that the lower part The bearing 10 is prevented from moving upward by the lower bearing cover 11, and the lower bearing 10 receives an upward thrust. Therefore, there is no need to consider upward thrust in the upper bearing 6, and the downward movement can be prevented by, for example, the upper bearing cover 8, contrary to the lower bearing 10, resulting in a simple and compact structure. Furthermore, if the size is the same as the conventional device, the allowable value of downward thrust will be increased. Furthermore, even if the entire structure including the upper bearing 6 and the lower bearing 10 is compared with a conventional device, the overall structure can be simplified and downsized by just slightly improving the structure of the lower bearing 10.

As described above, according to this invention, since the structure is such that the upward thrust is received by the lower bearing, only the downward thrust needs to be considered in the upper bearing.
The overall structure of the upper and lower bearings is simplified,
It also has various effects such as being smaller and cheaper.

[Brief explanation of the drawing]

FIG. 1 is a partial side sectional view showing a conventional bearing device for a vertical rotating machine, FIG. 2 is a partial side sectional view showing an embodiment of the bearing device for a vertical rotating machine according to this invention, and FIG.
The figure is an enlarged view of the main part of FIG. 2. In the figure, 1 is a frame, 4 is a rotation axis, 40
1 is a stepped surface, 5 is an upper bracket, 6 is an upper bearing, 601 is an inner ring, 602 is an outer ring, 7 and 8 are upper bearing covers, 9 is a lower bracket, 901 is a stepped surface, 10 is a lower bearing, 101 is an inner ring, 102 is an outer ring, 11 is a lower bearing cover, and 12 is a grease removal ring. Note that the same parts in each figure are given the same reference numerals.

Claims (1)

[Scope of utility model registration request] a cylindrical frame, a lower bracket that covers the lower end of the frame, a rotating shaft installed vertically within the frame, a rotating shaft that is housed within the lower bracket and rotatably supports the lower part of the rotating shaft; a lower bearing capable of receiving an upward thrust; and an upper bearing rotatably supporting an upper part of the rotating shaft and receiving a downward thrust of the rotating shaft, an inner ring of the lower bearing being fixed to the rotating shaft; In a bearing device for a vertical rotating machine, the outer ring of the lower bearing is slidably mounted on the lower bracket, and the upper end surface of the outer ring of the lower bearing is prevented from moving upward by a lower bearing cover. 1. A bearing device for a vertical rotating machine, characterized in that an end face is covered with the lower bracket with a gap interposed therebetween.