Oil sealing device for a bearing

Patent metadata

Field	Value
Publication number	US-9829107-B2
Application number	US-201615374015-A
Country	US
Kind code	B2
Filing date	Dec 9, 2016
Priority date	Apr 12, 2016
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

An oil sealing device for preventing a leakage of an oil of a bearing which supports a rotary shaft of a rotating machine has a brush member having a plurality of bristles in contact with the rotary shaft, and an actuator configured to move the brush member in a length direction of the rotary shaft, wherein a sloped surface having different heights along a length direction of the rotary shaft is formed at the rotary shaft, and wherein when the bristles are worn, the actuator moves the brush member in a length direction of the rotary shaft so that the bristles comes into contact with the sloped surface.

First claim

What is claimed is:

1. An oil sealing device for preventing a leakage of an oil of a bearing which supports a rotary shaft of a rotating machine, the oil sealing device comprising:
a brush member having a plurality of bristles in contact with the rotary shaft; and
an actuator configured to move the brush member in a length direction of the rotary shaft,
wherein a sloped surface having different heights along a length direction of the rotary shaft is formed at the rotary shaft, and
wherein when the bristles are worn, the actuator moves the brush member in a length direction of the rotary shaft so that the bristles comes into contact with the sloped surface.

2. The oil sealing device according to claim 1 ,
wherein the actuator is configured to move the brush member so that the bristles climb up along the sloped surface according to an abrasion amount of the bristles.

3. The oil sealing device according to claim 2 , wherein:
the actuator is a piezoelectric actuator having a piezoelectric element whose length changes when a voltage is applied thereto; and
the brush member is configured to move according to the changed length of the piezoelectric actuator.

4. The oil sealing device according to claim 3 ,
wherein the oil sealing device includes a controller configured to control a length of the piezoelectric actuator by using data of an abrasion amount of the bristles according to a rotation speed and an operation time of the rotary shaft.

5. The oil sealing device according to claim 4 , wherein:
the actuator is a spring actuator having a spring with an elastic restoration force for pushing or pulling the brush member in a length direction of the rotary shaft; and
the elastic restoration force of the spring is balanced with a frictional force generated when the bristles come into contact with the rotary shaft.

6. The oil sealing device according to claim 5 , wherein:
in response to the bristles being worn, and thus the frictional force between the bristles and the rotary shaft is weakened or removed, the brush member is configured to move by means of the elastic restoration force; and
the brush member is configured to move until the elastic restoration force of the spring is balanced again with the frictional force between the bristles and the rotary shaft.

7. An oil sealing device for preventing a leakage of an oil of a bearing which supports a rotary shaft of a rotating machine, the oil sealing device comprising:
a brush member having a plurality of bristles in contact with the rotary shaft;
an actuator configured to move, based on data of an abrasion amount of the bristles, the brush member in a length direction of the rotary shaft; and
a sloped surface having different heights along a length direction of the rotary shaft formed at the rotary shaft.

Assignees

• Korea Inst Sci & Tech

Inventors

• Lee Yong Bok
• Kim Eo Jin
• Lee Jeon Kook

Classifications

• F16J15/3288 Primary

  Filamentary structures, e.g. brush seals · CPC title

• F16C33/76

  of ball or roller bearings · CPC title

• F16J15/3296

  Arrangements for monitoring the condition or operation of elastic sealings (F16J15/326 takes precedence); Arrangements for control of elastic sealings, e.g. of their geometry or stiffness · CPC title

• F16C19/543

  in O-arrangement · CPC title

• F16C33/7886

  mounted outside the gap between the inner and outer races, e.g. sealing rings mounted to an end face or outer surface of a race · CPC title