SU1733751A1 - Electric machine bearing assembly - Google Patents

Abstract

Usage: in electric machines of medium and high power with a vertical axis of the bearing shield. SUMMARY OF THE INVENTION: A bearing assembly has a bearing shield with a hub and stiffeners. A hub bearing with valves with an annular cavity is installed in the hub and on the shaft in order to discharge excess and spent lubrication and bearing caps. On the bearing shield, at least two adjacent stiffeners are interconnected by means of a strip. A cavity is formed with the hub to discharge excess and spent lubricant, communicating with the annular cavity of the valve by means of a radial channel formed in the shield hub. To evacuate the excess and spent grease from the bearing assembly in the peripheral zone of the cavity, a drainage hole is closed with a removable cover. The bearing unit can be provided with an additional cavity symmetrically located relative to the vertical axis of the shield. 2 h. p, f-ly, 3 ill. WITH

Description

The invention relates to electrical engineering, in particular, to the construction of bearing assemblies of medium and large electric machines, which use rolling bearings.

A bearing assembly of an electric machine is known, comprising a bearing shield in which radial ribs are made to stiffen, connecting the shield wall with its hub. A roller bearing is installed on the shaft at the place of its passage through the shield hub bore, the valve is made in the form of a centrifugal regulator disk, and covers are mounted on the ends of the shield hub, in one of which (in the outer) intake of excess and spent lubrication.

Such bearing assemblies have a common drawback: the cavity for receiving excess and spent lubrication is performed at the tide of the outer cover, and since its outer cylindrical surface has a shape suitable for machining on a lathe, the tide of the cavity fits either into the cover or attached to it additional chamber, increasing the volume of the cavity for receiving excess and spent lubrication. Maintenance of such units of an electric machine during operation is extremely difficult, since the point of connection rotating along VI

00

with

VI

ate

Lumuffs, connecting the ends of the shafts of the electric machine and the drive mechanism, in order to observe the safety measures, are covered with a casing, preventing access to the cavity. This circumstance implies the interface with the chamber of a special system made in the form of pipes for transporting excess and used lubricant beyond the envelope of the protective casing or the casing of the external fan. Having a significant resistance, such a communication system is clogged up with used and aged lubricant and during the next replenishment of grease, the bearing unit last does not reach the outlet of the reset system, but into the machine through sealing gaps, sprayed with pressure elements and, settling on current-carrying parts, reduces reliability electric car.

The purpose of the invention is to expand the operational capabilities and simplify the maintenance of bearings of the components of an electric machine during operation.

The goal is achieved by the fact that in a bearing assembly of an electric machine, a bearing shield with a hub and stiffening ribs and a rolling bearing mounted on the hub and on the shaft, as well as a valve with an annular cavity to remove excess and spent lubrication and bearing caps, at least two a number of arranged stiffeners are interconnected by means of a strip with the formation of a cavity with the hub for the discharge of excess and spent lubricant, communicating with the annular cavity of the valve through the radial channel. To remove excess and spent grease from the bearing assembly in the peripheral zone of the cavity, a drainage hole is closed with a removable cap. For ease of maintenance, the bearing assembly is provided with an additional cavity symmetrically located with respect to the vertical axis of the bearing assembly to discharge excess and spent lubrication.

FIG. 1 schematically shows a bearing unit of an electric machine with a cavity for receiving excess and spent lubricant, longitudinal section; in fig. 2 is a view A of FIG. one; in fig. 3 shows a section BB in FIG. 2 (arrows show the movement of the grease during filling, discharge of excess and spent grease into the receiving cavity of the bearing assembly).

The bearing unit (figs. 1 and 2) of the electric machine consists of a shield 1, with a hub 2 and stiffening ribs 3 mounted on the shaft 4 of the rolling bearing 5 and a valve 6 with an annular cavity 7 to dump excess and spent lubrication, as well as

bearing caps 8, bolted to the hub 2 of the bearing shield 1.

The shield 1 of the bearing assembly (Figs. 1 and 2) is a welded structure consisting of a flange 9 with holes for attachment to the base of the electric machine, a hub 2 with a central bore for bearing 5 connected with them by stiffeners 3, made in the form of channel bar

5 (Fig. 3), the shelves of which have, in the place of welding to the hub 2, the maximum necessary height dimension, and in the place of welding to the flange 9, a height close to the thickness of the shield flange 9. The channel jumper is installed

0 on the hub 2 perpendicular to its generatrix. Segments 10 are welded into the gap between the stiffening ribs 3, the hub 2 and the flange 9. At least two adjacent stiffening ribs 3 are

5, the height from the hub 2 to the flange 9 is interconnected by means of a strip 11 to form with the hub 2, stiffening ribs 3 and the flange 9 - cavities 12 for dumping excess and spent lubrication. In the channel bar of the channel in the peripheral zone of the cavity, a drainage hole 13 is made, closed by a removable cover 14. The cavity 12 is connected to the annular cavity 7 of valve b by means of a radial channel 15 made in the hub 2 of the bearing plate 1 between the channels of the channel. The bearing unit can be provided with an additional symmetrically located relative to

0, the vertical axis of the bearing shield 1 has a cavity 2 for the discharge of excess and spent lubricant. In this case, maintenance of the bearing assemblies during operation does not depend on the installation location of the electric machine, and the available cavity volume of these assemblies makes it possible not to clean them from the spent lubrication long time mainly when replacing or failure of the bearing

0 5 rolling.

Such bearing assemblies allow their long-term use in electric machines with mechanisms that operate in automatic mode in almost all remote areas where there is a shortage of maintenance personnel, and the rejection of additional communication devices to remove excess and spent lubrication and placement of bearing shield cavities

located symmetrically with respect to the vertical axis of the bearing shield allows simplifying the maintenance of electric machines.

Claims (3)

Claim 1. Bearing assembly of an electric machine, comprising a bearing shield with a hub and stiffening ribs and a rolling bearing mounted on the hub and on the shaft, as well as a valve with an annular cavity for dumping excess and spent lubricant and bearing roofs, characterized in that in order to expand operational capabilities and simplify maintenance, at least two adjacent stiffeners are interconnected by means of a batten to form a cavity with the hub to discharge excess and avshey lubricant, communicating with the annular cavity of the valve means provided in the hub of the radial channel shield. 2. Node pop. 1, characterized in that in a bearing shield in the peripheral zone of said cavity, a drainage hole is closed with a removable cover. 3. Node on PP. 1 and 2, characterized in that it is provided with an additional symmetrically positioned relative to the vertical axis of the bearing shield cavity for dumping excess and spent grease. , ///////////////// G ////// UL $ b -Z7Xs, .v, „,. $ /four at / J FIG. one IS / tf If / 13 ten