JPH066753U - Split type rotary bearing unit - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a split type rotary bearing unit capable of maintaining an appropriate internal pressure in the bearing, preventing grease leakage, and sufficiently maintaining lubrication. [Structure] A bearing having a structure in which a rolling element 4 is arranged between a split outer ring 2 and a split inner ring 3 and the inner ring is integrally coupled by a split fastening ring 5 is arranged in a split housing 1. Then
A gland packing 8 and a seal ring 9 are respectively provided in the two annular grooves 5a and 5b formed on the outer peripheral surface of the fastening ring 5.
In a split type rotary bearing unit in which the housing and the fastening ring are hermetically sealed by inserting and, the at least one gland packing 8 is provided between the two annular grooves 5a and 5b of the fastening ring 5. A split type rotary bearing unit characterized in that a space 11 between the seal ring 9 and the housing 1 and the fastening ring 5 and a communication hole 12 communicating with the outside are formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a rotary bearing unit used in a pinch roll supporting portion of a continuous casting facility.

[0002]

[Prior art]

 Since the pinch roll used in continuous casting equipment has a large load, it is sometimes supported at both ends as well as at the center. In this case, as the bearing of the central support part, a rotary bearing unit of a split type is used for assembly. Conventionally, a rotary bearing unit of this type has been shown in FIG. 3 in which the upper and lower housings 21a and 21b of the housing 21 are divided into upper and lower parts, and the outer ring 22 and the inner ring 23 are both divided into two parts. Further, the rolling element 24 is arranged, and the cylindrical end portion 23a of the two-divided inner ring 23 is fitted and fixed to the inner diameter portion of the split fastening ring 25. Further, a labyrinth ring 27, which is divided into two parts, is fitted and sealed between the upper housing 21a and the lower housing 21b. Two annular grooves 25a and 25b are provided on the outer peripheral surface of the fastening ring 25, a string-shaped gland packing 28 is fitted in the outer annular groove 25a, and a double lip seal is inserted in the inner annular groove 25b. A bearing 29 is inserted to seal the inside 30 of the bearing. A passage 21c is formed in the center of the inner peripheral surface of the upper housing 21a and the lower housing 21b which are divided into two parts. The raceways of the rolling elements 24 and the outer ring 22 and the inner ring 23 are lubricated through 22a.

[0003]

[Problems to be solved by the device]

 As described above, the conventional split bearing unit has a large sealing effect due to the hermetically sealed structure including the gland packing and the multiple lip seal. As a result, the internal pressure in the outer ring 22 and the inner ring 23 of the bearing becomes unnecessarily large, and is not discharged from the regular passage, that is, the sliding surface between the gland packing 28 and the housing 21, and the upper housing 21a other than the regular passage is not discharged. The grease may be a leakage problem from the mating surface of the lower housing 21b. The present invention has been made in view of the above problems, and its purpose is to make the inside of the bearing have an appropriate internal pressure and to prevent grease leakage from a place other than the proper passage. It is to provide a split type rotary bearing unit.

[0004]

[Means for Solving the Problems]

 That is, as a means for solving the above problems, the present invention is a bearing having a structure in which a rolling element is arranged between a split outer ring and an inner ring and the inner ring is integrally connected by a split coupling ring. Is placed in a split housing, and a gland packing and a compound lip are respectively inserted into two annular grooves formed on the outer peripheral surface of the fastening ring to form a sealing structure between the housing and the fastening ring. In the split type rotary bearing unit, at least one place between the two annular grooves of the fastening ring, a space between the gland packing, the multiple lip seal, the housing and the fastening ring, and a communication hole to the outside, preferably. The feature is that a hole having a small diameter is formed.

[0005]

[Action]

 When the split type rotary bearing unit is used as the above means, the internal space 10 formed between the housing 1, the gland packing 8, the fastening ring 5 and the inner ring 3 due to the existence of the gland packing 8 outside the fastening ring 5, The pressure at 11 will never increase. Further, the hole 12 formed between the annular groove 5a and the inner annular groove 5b acts to release the internal pressure, but since the diameter is small, it is possible to prevent the entry of foreign matter such as dust and the like, and in the unlikely event of foreign matter. The compound lip seal 9 can prevent even if the

[0006]

【Example】

 Hereinafter, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an axial sectional view of an embodiment of a split type rotary bearing unit of the present invention, and FIG. 2 shows a case where a fastening ring 5 (described later) of the split type rotary bearing unit of the present invention is changed. It is a modified example. Between the upper housing 1a and the lower housing 1b of the split housing 1, a similarly split outer ring 2 and inner ring 3 are arranged, and between the outer ring 2 and the inner ring 3 there is rolling. Cylindrical rollers 4 that are moving bodies are filled and arranged. A lubricating oil passage 1c is formed in the center of the inner peripheral surface of the upper housing 1a and the lower housing 1b of the split housing 1 to be filled with lubricating oil (grease), and the outer ring 2 is provided with a cylindrical roller. A plurality of holes 2a for passage of lubricating oil, which communicates with the space in which 4 is arranged, are formed. Therefore, the lubricating oil is filled from the outside into the passage 1c formed in the center of the inner peripheral surface of the upper housing 1a and the lower housing 1b, passes through the hole 2a formed in the bearing outer ring 2, and passes through the cylindrical roller 4, the outer ring 2 and The raceway surface of the inner ring 3 is lubricated. 6 is a pinch roll, and 7 is a seal ring which slides on the pinch roll 6.

Next, 5 is a halved fastening ring, and the inner ring 3 of the bearing is divided by inserting the cylindrical portion 3 a formed on the inner ring 3 into the inner peripheral surface of the fastening ring 5. Fix. Two annular grooves 5a and 5b are formed on the outer peripheral surface of the fastening ring 5, a string-shaped gland packing 8 is fitted into the outer annular groove 5a, and the inner annular groove 5b is a kind of seal ring. The multiple lip seal 9 is fitted and inserted, and the internal space 10 formed between the housing 1 and the outer ring 2 and the inner ring 3 is sealed. Then, at least one hole 12 having a small diameter is formed between the outer annular groove 5a and the inner annular groove 5b into which the gland packing 8 and the multiple lip seal 9 are fitted. The inclination angle of the hole 12 with respect to the axial direction is preferably about 80 °. In this way, the internal pressure generated between the gland packing 8, the housing 1, the fastening ring 5 and the inner ring 3 is released to a proper internal pressure to prevent the lubricating oil from leaking from the mating surface of the upper housing 1a and the lower housing 1b. You can do it.

In FIG. 2, a labyrinth ring 15 is fitted in a part of the housing 1, and a gap between the labyrinth ring 15 and the fastening ring 5 is sealed with a gland packing 8 so that a gap between the annular groove 5 a and the annular groove 5 b is sealed. This is an embodiment in which a hole 12 is formed in the fastening ring 5. Also in this case, similarly, the internal pressure between the gland packing 8, the fastening ring 5, the inner ring 3, the housing 1 and the labyrinth ring 15 is released through the hole 12, and the lubricating oil from the mating surface between the upper housing 1a and the lower housing 1b is used. Leakage can be prevented.

The split type rotary bearing unit according to the present invention has the structure as described above in detail, so that the presence of the gland packing 8 outside the fastening ring 5 causes the housing 1, the ground packing 8, the inner ring 3 and the fastening ring. The internal space 10, 11 formed between the internal space 5 and the internal space 5 does not increase in pressure. Further, the hole 12 formed between the annular groove 5a and the inner annular groove 5b acts to release the internal pressure, but since the diameter is small, it is possible to prevent the entry of foreign matter such as dust and the like, so that the foreign matter may enter. Even so, the compound lip seal 9 can prevent it. The multiple lip seal 9 as the seal ring may not be the multiple lip seal as in the embodiment.

[0010]

[Effect of device]

 Since the split type rotary bearing unit according to the present invention is configured as described above in detail, the internal pressure of the internal space formed between the housing and the outer ring and the inner ring does not become abnormally high and is always appropriate. Can be kept at Therefore, the leakage of lubricating oil from the mating surface between the upper housing and the lower housing, which has been a problem in the past, is eliminated. Further, it is possible to prevent troubles due to intrusion of foreign matter.

[Brief description of drawings]

FIG. 1 is an axial sectional view of an embodiment of a split rotary bearing unit of the present invention.

FIG. 2 shows an embodiment in which a labyrinth ring is fitted in a part of the housing and a gland packing seals between the labyrinth ring and the fastening ring.

FIG. 3 is an axial sectional view of an example of a conventional split rotary bearing unit.

[Explanation of symbols]

1 Housing 1a Upper housing 1b Lower housing 1c Lubricating oil passage 2 Outer ring 2a Lubricating oil passage hole 3 Inner ring 4 Roller 5 Fastening ring 5a, 5b Annular groove 8 Grand packing 9 Double lip seal 10 Internal space 12 Hole

Claims (1)

[Scope of utility model registration request] 1. A bearing having a structure in which a rolling element is arranged between a split outer ring and an inner ring, and the inner ring is integrally coupled by a split fastening ring is arranged in a split housing. A split type rotary bearing unit in which a gland packing and a seal ring are respectively inserted into two annular grooves formed on the outer peripheral surface of the fastening ring to form a sealed structure between the housing and the fastening ring. A split rotary bearing unit, characterized in that at least one place is provided between the two annular grooves with a communication hole communicating with the space between the gland packing, the seal ring, the housing and the fastening ring and the outside.