JPS5825920B2 - bearing device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement in a bearing device for a chamber shaft.

Conventionally, in this type of bearing device, a structure as shown in FIG. 1 has been adopted in which oil is supplied to the bearing by utilizing rotation of the shaft.

Namely, 1 is a shaft, 2 is a bearing portion that supports the shaft 1 in the Ujifugu 4 via a rolling bearing 3, 5 is an oil tank having an oil cylinder weir 6 and formed to house the bearing portion, 7 is axis 1
8 is a pump casing formed in the downwardly extending portion of the housing 4, and when the pump collar 7 rotates, the cylindrical pump collar rotates in the oil stored in the oil tank 5. Oil is pumped up from the pump hole 7a through the pump 8a of the pump casing and supplied to the bearing part 2.

The pumped up oil lubricates the bearing 3, is shaken off by the back surface 7b of the pump collar located below it, and is transferred to the housing 4.
It returns to the oil tank 5 through the oil drain hole 4a provided in the oil tank 5.

In a bearing device having such a configuration, it is almost inevitable that oil paper is generated within the oil circulation path, and the amount of oil paper generated increases as the rotation speed increases.

In order to maintain the proper oil level in the bearing oil tank 5 and prevent oil from leaking beyond the oil cylinder weir 6, the generated oil paper is removed by installing a vent pipe (not shown) directly or indirectly from the oil tank to the outside of the machine. However, oil paper flows out of the machine from the air vent pipe and adheres to and stains the external surfaces of the rotating machine itself and other equipment.

Particularly when the machine is an open-type rotating electric machine, there is a drawback that the re-inflow into the machine can cause adhesion to and staining of internal coils and the like, causing an accident.

One of the biggest sources of this oil paper is the back surface 7b of the pump collar, and the reason for this is that the oil that has come down from the bearing is shaken off by the rotating back surface 7b of the pump collar, and the oil with added speed is...・This is caused by hitting the inner surface of the ujing.

Therefore, conventional countermeasures have been taken such as finishing the back surface of the pump collar neatly, but this has not been sufficient to prevent the generation of oil paper.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a bearing device that has a simple structure and can greatly reduce the generation of oil paper.

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 2, parts that are the same as those in the conventional example shown in FIG.

In this embodiment, between the bearing 3 and the pump collar 7,
The upper end is close to the inner ring 3a of the bearing, and there is a space between the upper end and the small diameter part 7c forming the boss part of the pump collar so that they do not come into contact with each other, and the lower end is fixed to the inner surface of the Ujifugu 4. Attach a drain oil receiver 9 that is approximately in the shape of an inverted funnel.
...An oil drain hole 4b is provided in the housing 4, which leads from the lower end of the oil drain receiver 9 to the oil tank 5.

By providing the drain oil receiver 9 below the bearing portion 2 in this manner, oil circulates as shown by the arrow.

That is, most of the oil discharged from the bearing 3 naturally falls along the oil drain receiver 9 and returns to the oil tank 5 through the oil drain hole 4b.

Of course, since there is a small amount of oil that falls onto the back surface 7b of the pump collar from the space between the drain oil receiver 9 and the small diameter portion 7c of the pump collar 7, it is necessary to provide the conventional oil drain hole 4a.

In the present invention, with such an oil drain structure, most of the drained oil does not adhere to the rotating pump collar 7, but passes through the stationary drain oil receiver, so the generation of oil paper in this area is greatly reduced. Can be reduced.

However, it goes without saying that the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with various modifications without changing the gist thereof.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the right half of a conventional bearing device, and FIG. 2 is a vertical cross-sectional view of the right half of an embodiment of the bearing device according to the present invention. 1... Shaft, 2... Bearing part, 3... Bearing, 3a...
・Bearing inner ring, 4...Using, 4a...Oil drain hole, 4b...Oil drain hole, 5...Oil tank, 6...Oil cylinder weir, 7...Pump collar 7a・...Pump hole, 7b...
・Back side of pump collar, 7c...Small diameter part of pump collar, 8...Pump casing, 9...Drain oil receiver, 8a
...Quiet.

Claims (1)

[Claims] 1 A vertical shaft is installed in an oil tank via a rolling bearing.
・Supported by a housing to form a bearing part, fitted with a pump collar with the small diameter part fitted to the shaft below this bearing part and the large diameter part submerged in the oil stored in the oil tank. In a device that uses the coaxial pump collar to pump up oil and supply oil to the bearing, the upper end is close to the inner ring of the bearing between the bearing and the pump collar, and the small diameter part of the pump collar does not come into contact with each other. A bearing characterized in that an inverted funnel-shaped oil drain receiver is installed with a lower end fixed to the inner surface of the housing, and an oil drain hole is provided in the housing that passes through the oil tank from the lower end of the oil drain receiver. Device.