JPH03150045A - Bearing unit for dynamo-electric machine - Google Patents

Abstract

PURPOSE:To enable oil mist lubrication by supplying air by means of a fan, mounted on a shaft closely to a bearing, through a vent to the bearing and coupling an oil supply tube having one end communicated with the oil sump in a bearing cover to the way of the vent. CONSTITUTION:A small fan 10 for producing oil mist is fixed to the outer part of a bearing 4 for a shaft 1 closely to the bearing. Lubricant A is stored in the lower part of an outer bearing cover 5 covering the small fan 10, and a vent 11 having one end opened to the outer circumferential part of the small fan 10 and the other end opened to the inside of a rolling bearing 4 while penetrating through a bracket 3 and an inner bearing cover 6 is provided. An oil supply tube 12 having one end communicated with the lubricant 7 is coupled to the way of the vent 11. When the small fan 10 rotates to supply air through the vent 11, the oil supply tube 12 sucks the lubricant 7 and sprays a mixture of oil and air, so-called oil mist, to the bearing 4 thus lubricating the bearing efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bearing device for a high-speed horizontal shaft rotating electric machine having a rolling bearing.

[Conventional technology]

It is desirable for a high-speed rotating electrical machine to have a bearing structure that is as simple as possible, provides effective lubrication, reduces bearing loss, and has a long bearing life.

Conventionally, high-speed horizontal shaft rotating electrical machines with rolling bearings that exceed the limits of grease lubrication have adopted oil bath lubrication as shown in FIG. In Fig. 3, 1 is a rotating shaft, 2 is an internal fan, 3 is a bracket, 4 is a rolling bearing, and the shaft 1
is supported by a bracket 3 via a rolling bearing 4. The rolling bearing 4 is covered with an outer bearing cover 5 and an inner bearing cover 6. Lubricating oil is stored in the lower parts of these bearing covers, and the lower part of the rolling bearing 4 is immersed in the lubricating oil. 8 is an air chamber which prevents the internal fan 2 from sucking out lubricating oil. An oil drain 9 is provided in each bearing cover and the shaft penetrating portion of the air chamber. When the shaft rotates, the rolling bearing 4 splashes lubricating oil to provide lubrication.

[,Problem that the invention seeks to solve]

Conventional bearing devices for high-speed, horizontal-shaft rotating electric machines like this have rolling bearings that rotate through lubricating oil, resulting in large agitation losses of the lubricating oil.Therefore, there are limits to the rotational speed and bearing size, and if the limits are exceeded, the oil Oil mist lubrication requires a separate oil mist generator, which poses problems in terms of cost and handling.

An object of the present invention is to effectively lubricate a bearing by generating oil mist using the rotation of a rotating electric machine itself without providing a separate oil mist generating device.

[Means to solve the problem]

In order to solve the above problems, according to the present invention, a small fan for generating oil mist is attached to the shaft of a horizontal rotating electric machine having an oil-lubricated rolling bearing near the outside of the rolling bearing, The bearing cover of the rolling bearing provided to cover the small fan is provided with a ventilation hole that opens at one end to the outer periphery of the small fan and the other end leads to the rolling bearing. The bearing cover is connected to an oil guide pipe which is immersed in lubricating oil stored in the lower part of the bearing cover.

[Effect]

A small fan installed on the shaft near the bearing guides air to the bearing through a ventilation hole, and if an oil pipe with one end immersed in the oil reservoir of the bearing cover is connected in the middle of the ventilation hole, a so-called misting effect can be created. Oil mist gushes out from the ventilation hole,
The bearings are now lubricated by oil mist.

〔Example〕

1 and 2 show a bearing device for a rotating electric machine according to an embodiment of the present invention, and parts indicated by the same reference numerals as in FIG. 3 are the same parts. 1 is a rotating shaft, 3 is a bracket, and the shaft 1 is supported by the bracket 3 via a rolling bearing 4. An outer bearing cover 5 and an inner bearing cover 6 are respectively attached to the bracket 3 to cover the rolling bearing 4.

Lubricating oil is stored in the lower part of the outer bearing cover 5.

A small fan 10 is mounted on the outside of the bearing 4 of the shaft l and close to the bearing 4.
is attached, and the small fan 10 is covered with an outer bearing cover 5. The outer bearing cover 5 is provided with a ventilation hole 11 that has one end open to the outer circumference of the small fan 10 and the other end that passes through the bracket 3 and the inner bearing cover 6 and opens inside the rolling bearing 4. An oil guide pipe 12 having one end immersed in lubricating oil 7 is connected in the middle of the hole 11.

Further, an intake cylinder 13 is attached to the outer bearing cover 5, and the end thereof is exposed to the intake port of the small fan IO. Oil seals 14 are provided at the shaft penetrating portions of the outer and inner bearing covers.

When this rotating electric machine is operated, the small fan 10 rotates and draws outside air from the intake pipe 13 and blows it inside the bearing 4. However, as the wind flows through the ventilation hole 11, the oil guide 'f12 is lubricated. The bearing 4 is effectively lubricated by sucking up the oil and spraying air mixed with oil in the form of a spray, so-called oil mist, onto the bearing 4.

〔Effect of the invention〕

According to the present invention, oil mist lubrication is possible with a simple device installed in a rotating electric machine without installing a separate oil mist generator, and the rotation speed and bearing size at which good lubrication can be achieved are expanded, resulting in high-speed rotation. It has the effect of improving the performance of bearings in electrical machinery.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of the bearing device of the rotating electrical machine of the embodiment, Figure 2
The figure is a partial sectional view taken along the line nu in FIG. 1, and FIG. 3 is a longitudinal sectional view of a conventional oil bath lubricated bearing for a rotating electric machine. DESCRIPTION OF SYMBOLS 1... Shaft, 3... Bracket, 4... Rolling bearing, 5... Outer bearing cover, 6... Inner bearing cover, 7... Lubricating oil, 10... Small fan, 11 ...
Ventilation hole, 12... Oil guide pipe, 13... Intake cylinder, 14.
··Oil seal. ? 15 Outer bearing force 8-l' Figure 1 Figure 2 Qb assembly 3 Figure

Claims (1)

[Claims] 1) A small fan for generating oil mist is attached to the shaft of a horizontal rotating electric machine having an oil-lubricated rolling bearing in close proximity to the outside of the rolling bearing, and the rolling bearing is provided to cover the small fan. A ventilation hole is provided in the cover with one end opening on the outer periphery of the small fan and the other end leading to the rolling bearing, and the end part is immersed in lubricating oil collected at the bottom of the bearing cover in the middle of the ventilation hole. A bearing device for a rotating electric machine characterized by being formed by combining oil guide pipes.