JPH0752425Y2 - Sealing device for outer ring rotary roller bearings for rolling mills - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a sealing device for an outer ring rotary roller bearing for a rolling mill, for example, a roller bearing for a backing roll of a multi-stage rolling mill.

[Conventional technology]

Conventionally, for example, in a multi-stage rolling mill, what is called a backing roll is arranged around the work roll in order to prevent the work roll from being bent during rolling. As this backing roll, there is one having a structure in which a plurality of cylindrical roller bearings are mounted on a single shaft.

In this type of backing roll, oil mist-like lubrication is supplied to each roller bearing through the inside of the bearing,
Also, it is configured to be collected through the inside of the bearing. Therefore, in order to prevent this lubricating oil from leaking to the outside and adhering to the material to be rolled, and to prevent the intrusion of cooling water, dust, etc. from the outside, the side openings between the inner and outer rings of each roller bearing are prevented. Equipped with a sealing device.

As this sealing device, a device using a garter spring in order to secure a relatively large seal withstanding pressure, for example, a second
A seal ring as shown in the figure is adopted and mounted on the roller bearing in the form as shown.

In the figure, 1 is an outer ring, 2 is a divided inner ring, 3 is a seal ring, 4 is a roller, and 5 is a cage for holding rollers. Inner ring 2
The hole 2A provided in the center of the inner ring 2 is for guiding the lubricating oil supplied through the inside of the side (not shown) to which the inner ring 2 is attached to the raceway part in the bearing, and the holes provided on both sides of the inner ring 2
2B is for collecting the lubricated lubricating oil of the raceway portion through the inside of the shaft.

The seal ring 3 is fitted and fixed to the stepped portion on the inner peripheral surface of the end portion of the outer ring 1, and has an annular core metal 3A having a substantially inverted L-shaped cross section and is formed on the inner diameter side of the core metal 3A by being adhered. A garter in which the inner peripheral portion of the lip 3C mounted on the outer peripheral portion of the cylindrical portion of the sealed main body 3B is pressed against the outer peripheral surface of the side portion 6 which is integrally provided on the outer end portion of the inner ring 2 and which guides the roller 4 in the radial direction. It has a spring 3D. The end surface of the lip 3C faces the inside of the bearing.

By the way, in each of the roller bearings constituting the backing roll, an outer ring rollingly in contact with a work roll (not shown) is rotated at a relatively high speed, and an inner ring and a shaft (not shown) to which the inner ring is fitted are used immovably. .

[Problems to be solved by the device]

 The above conventional example has the following disadvantages.

That is, in the roller bearing sealing device constituting the backing roll, since the outer ring 1 is rotated at a relatively high speed as described above, the seal ring 3 is also rotated together with the outer ring. Although the garter spring 3D is used due to the force, the seal body 3B may float outward in the radial direction, and the contact pressure of the lip 3C with respect to the inner ring 2 is likely to decrease. As a result, the sealing performance deteriorates significantly, causing leakage of lubricating oil inside the bearing and the ingress of external cooling water, which leads to a reduction in bearing life and, in addition, when lubricating oil leaks outside the bearing Also, the oil adheres to the material to be rolled, which reduces the product value such as eliminating the luster of the material to be rolled.

The present invention aims to improve the sealing performance of the bearing in order to solve such problems.

[Means for Solving the Problems]

That is, in order to solve the above problems, the present invention provides a means for forming a sealing device for an outer ring rotary roller bearing for a rolling mill, in which the inner diameter portion of the first annular plate portion extending in the radial direction is the shoulder portion of the inner ring. An annular holder that is fixed and that has an outer tubular portion that extends in the axial direction on the outer diameter side of the first annular plate portion, and a radially-extending first holder that is disposed on the outer tubular portion side so as to face the holder. The outer diameter portion of the second annular plate portion is fixed to the outer ring, and extends in the axial direction so as to face the inner diameter side of the second annular plate portion so as to face the inner peripheral side annular space of the outer cylindrical portion of the holder. A first seal that forms a first sealing portion between an annular receiving member having an inner tubular portion that faces the tubular portion and an outer peripheral surface of the inner tubular portion of the receiving member that is supported by the inner circumferential surface of the outer tubular portion of the holder. A ring and a second annular plate portion of the receiving member supported on the outer peripheral surface of the outer cylinder portion of the holder. A second seal ring that forms a second seal portion with the surface, and a third seal portion that is a minute gap formed between the outer peripheral edge of the first annular plate portion and the inner peripheral surface of the outer ring. It is characterized by

[Action]

When the sealing device for the outer ring rotary roller bearing for a rolling mill is the above-mentioned means, the first and second seal rings themselves are made immovable by supporting the first and second seal rings on the stationary inner ring via the holder. Therefore, it is possible to prevent the first and second seal rings, which come into contact with the receiving member attached to the outer ring that can be rotated, from floating outward in the radial direction as in the conventional case.

〔Example〕

An embodiment of this invention will be described below with reference to FIG. In this figure, parts that are the same as the parts shown in FIG. 2 of the conventional example are given the same reference numerals, and descriptions thereof will be omitted. The sealing device of this embodiment includes a first seal ring 3, a second seal ring 24, a holder 10 that holds the seal ring 24, and a receiving member 20 that serves as a seal seat.

An annular holder 10 is mounted on the outer peripheral surface of a shoulder portion 6 integrally provided on the outer end portion of the divided inner ring 2, and an annular active member serving as a seal seat on the stepped portion on the inner peripheral surface of the end portion of the outer ring 1. 20 is mounted and the first and second seal rings are attached to the holder 10.
The first and second seal rings 3,24 are supported by supporting 3,24.
The lips 3C and 24C are pressed against the member 20.

Specifically, the holder 10 includes a first annular plate portion 11 that extends in the radial direction, an inner tubular portion 12 that is integrally formed on the inner peripheral edge of one side of the first annular plate portion 11, and the inner tubular portion. On the same side where the cylindrical portion 12 of the first annular plate portion 11 is formed concentrically, there is an outer peripheral portion 13 integrally formed on a portion slightly inside the outer peripheral edge 14 on the inner diameter side. Then, the inner tubular portion 12 is press-fitted to the outer peripheral surface shoulder portion of the inner ring so that the free ends of the inner tubular portion 12 and the outer tubular portion 13 face the inside of the bearing, and the outer peripheral edge 14 of the first annular plate portion 11 is To face the cylindrical surface of the step portion 1A formed on the shoulder portion of the inner peripheral surface of the outer ring 1 with a minute gap therebetween to form a third sealing portion.

The receiving member 20 has a second annular plate portion 23 that extends in the radial direction.
Among them, the outer peripheral edge is formed in a substantially U-shaped cross section having a cylindrical portion 21 and an outer cylindrical portion 22 that extend in the axial direction on the same side, and the inner cylindrical portion 21 and the outer portion are formed on the inner side of the bearing from the holder 10. The outer cylinder 22 is fitted with an O-ring 30 so that the free end of the cylinder 22 faces the outside of the bearing.
Via the snap ring near the side wall of the step 1A of the outer ring 1
It is positioned and fitted at 31, and the inner tubular portion 21 faces the space between the outer tubular portions 12 and 13 of the holder 10.
The inner peripheral surface and the outer peripheral surface of the inner cylindrical portion 12 of the holder 10 are arranged so as to face each other so as to form a minute gap.

Then, the first seal ring 3 is fitted and supported on the inner peripheral portion of the outer cylindrical portion 12 of the holder 10, and the seal body of the first seal ring 3 is
The inner peripheral portion of the lip 3C formed on the inner periphery of 3B is pressed radially inward to the outer peripheral surface of the inner cylindrical portion 21 of the receiving member 20 by the garter spring 3D mounted on the outer periphery of the lip 3C. It is considered as one sealed part. Here, 3A is an annular core bar having a substantially inverted L-shaped cross section. Also, the end surface of the lip 3C faces the inside of the bearing. The structure of this seal ring 3 is almost the same as the seal ring 3 of FIG. 2 which is a conventional example.

Further, the second seal ring 24 is fitted and supported on the outer peripheral surface of the outer tubular portion 12 of the holder 10, and the second annular plate portion 23 of the seal body 24A is provided.
A flexible seal lip 24C is formed at the end of the seal body 24A by the annular V-shaped groove 24B provided at the outer diameter end on the side.
The seal lip 24C is brought into sliding contact with the second annular plate portion 23 of the receiving member 20 to form a second sealed portion. In this embodiment, the outer diameter portion 23A of the second annular plate member 23 is thick, and the seal lip 24C is in sliding contact with the side surface of the thick portion 23A.

As described above, in this embodiment, the holder in which the first and second seal rings 3 and 24 are fixed to the stationary inner ring 2 is used.
Since the first and second seal rings 3 and 24 are made immovable by being supported by 10, the contact pressure of the lips 3C and 24C with respect to the receiving member 20 of the first and second seal rings 3 and 24 is the outer ring that is rotated. Since it is not affected by the centrifugal force of 1, it remains unchanged.

The present invention is not limited to the above-described embodiment, but the holder 10 may be arranged on the inner side of the bearing and the receiving member 20 may be arranged on the outer side of the bearing. Also in this case, the arrangement of the outer tubular portion 13 of the holder 20, the inner tubular portion 21 of the receiving member 20, and the first and second seal rings 3 and 24 is the same as in the above-described embodiment. Further, in the embodiment, the inner ring 2 is divided and the shoulder portion 6 is integrated with the inner ring 2, but the inner ring 2 is integrally formed and the shoulder portion 6 is divided type, which can be easily selected within the scope of the present invention. Is.

[Effect of device]

According to the present invention, the holder is used to attach the first and second seal rings to the stationary inner ring.
The seal ring itself does not move, and the conventional lift of the seal ring can be prevented. Therefore, the contact pressures of the first and second seal rings that come into contact with the tubular portion of the receiving member are substantially unchanged, so that the sealing performance does not deteriorate as in the conventional example. In addition, the triple sealing structure of the first, second and third sealing portions further improves the sealing performance. In addition, it is possible to prevent cooling water or the like from entering the inside of the bearing from the outside of the bearing, which leads to an improvement in the life of the bearing. Moreover, since the first, second, and third sealing portions are configured in a multi-tiered manner in the radial direction,
The sealing device can be as compact as possible in the axial direction. Furthermore, by preventing leakage of the lubricating oil inside the bearing, it is possible to prevent the lubricating oil from adhering to the material to be rolled and prevent the product value from deteriorating.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an upper half portion of a roller bearing according to an embodiment of the present invention, and FIG. 2 is a partial sectional view showing an upper half portion of a roller bearing according to a conventional example. 1 …… Outer ring 2 …… Inner ring 3 …… First seal ring 10 …… Holder 20 …… Receiving member 24 …… Second seal ring

Claims (1)

[Scope of utility model registration request] 1. An annular shape having an inner diameter portion of a first annular plate portion extending in the radial direction fixed to a shoulder portion of an inner ring, and an outer cylindrical portion extending in the axial direction on the outer diameter side of the first annular plate portion. The holder and an outer diameter portion of a radially extending second annular plate portion arranged on the outer cylinder portion side facing the holder are fixed to the outer ring, and the holder is provided on the inner diameter side of the second annular plate portion. An annular receiving member that extends in the axial direction so as to face the inner circumferential side annular space of the outer tubular portion of the holder and has an inner tubular portion that faces the outer tubular portion, and is supported by the inner circumferential surface of the outer tubular portion of the holder. A first seal ring forming a first sealing portion with the outer peripheral surface of the inner tubular portion of the receiving member; and a side surface of the second annular plate portion of the receiving member supported by the outer peripheral surface of the outer tubular portion of the holder. A second seal ring that forms a second sealed portion between the outer peripheral edge of the first annular plate portion and the inner peripheral surface of the outer ring; The by minute gap formed 3
A sealing device for an outer ring rotary roller bearing for a rolling mill, comprising: a sealing portion.