JPH083709Y2 - Lubricant-sealed bearing unit for rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a lubricant-sealed bearing unit that is mounted on the roll neck of a rolling roll in a rolling mill.

<Prior Art> Conventionally, as a bearing unit that is mounted on the roll neck of a rolling roll in a rolling mill, for example, there is a bearing unit in which a lubricant is sealed inside.

As an example of this type of lubricant-sealed bearing unit, for example, one disclosed in Japanese Utility Model Publication No. 60-18658 is known.

 This will be described with reference to FIG.

In the figure, reference numeral 1 is a rolling roll, and a roll neck 2 of the rolling roll 1 is, for example, a four-row tapered roller bearing 3 (not shown in the figure) and a bearing housing 4.
It is supported by a roll stand (not shown) via a lubricant-sealed bearing unit composed of a so-called shaft box.

At the end of the roller bearing 3 in the bearing housing 4,
A sealing device 5 is provided that prevents lubricant such as grease inside the bearing from leaking to the outside and prevents external dust and the like from entering the inside of the bearing.

This sealing device 5 is held on the inner diameter side of the seal retaining ring 7 in a state of sliding contact with the seal retaining ring 7 inlay-bonded to the end face of the outer ring 6 and the outer peripheral surface of the small diameter extending portion 8a formed on the inner ring 8. And the seal member 9 is formed.

The outer diameters of the outer ring 6 and the seal retaining ring 7 are set to be the same in the axial direction so that the outer diameters of the both are the same. The surfaces are in close contact with the inner peripheral surface of the bearing housing 4, respectively.

By the way, the contact pressure of the seal member 9 against the outer peripheral surface of the extending portion 8a of the inner ring 8 is set in a state before the lubricant-sealed bearing unit is assembled to the roll neck 2.

<Problems to be Solved by the Invention> However, the conventional example having such a configuration has the following problems.

Since the seal retaining ring 7 is fixed to the outer ring 6,
This is convenient because the seal retaining ring 7 and the outer ring 6 can be easily aligned when the lubricant-sealed bearing unit is assembled to the roll neck 2 of the rolling roll 1. When the bearing housing 4 is deformed by an external force applied to the housing 4, the deformation of the bearing housing 4 is directly transmitted to the outer ring 6 and the seal retaining ring 7, and the deformation is caused.

When such deformation occurs, the contact pressure between the seal member 9 held by the seal holding ring 7 and the extending portion 8a of the inner ring 8 fluctuates, and therefore the sealing performance of the sealing device 5 is increased. Had to be lowered.

The present invention was created in view of such circumstances,
An object of the present invention is to make it possible to stably exhibit desired sealing performance without being affected by the deformation of each part that occurs during the operation of the rolling mill.

<Means for Solving Problems> In order to achieve such an object, the present invention has the following configuration.

The present invention relates to a lubricant-sealed bearing unit, which is externally mounted on a roll neck of a rolling roll and has a sealing device provided at an end portion in the axial direction, wherein the sealing device has a seal retaining ring arranged side by side on an end surface of a bearing outer ring. And a seal member held on the inner diameter side of the seal retaining ring in a state of sliding contact with the outer peripheral surface of the extension formed on the bearing inner ring, the outer diameter of the seal retaining ring being the outer diameter of the bearing outer ring. By setting the size smaller than the dimension, a predetermined gap is provided between the outer peripheral surface of the seal retaining ring and the inner peripheral surface of the bearing housing, and this gap is smaller than the fitting gap between the bearing outer ring and the bearing housing. The feature is that it is set large.

<Operation> The operation of the configuration of the present invention is as follows.

By setting the outer diameter of the seal retaining ring smaller than the outer diameter of the bearing outer ring, a predetermined gap is provided between the outer peripheral surface of the seal retaining ring and the inner peripheral surface of the bearing housing, and this gap Since the clearance is set to be larger than the fitting gap between the outer ring and the bearing housing, the deformation of the bearing housing during the operation of the rolling mill does not directly affect the seal retaining ring.

That is, as in the conventional case, the deformation of the bearing housing does not directly lead to the deformation of the seal retaining ring, so that the contact pressure between the seal member retained by the seal retaining ring and the extending portion of the inner ring is prevented from varying. The Rukoto.

<Embodiment> An embodiment of the present invention will be described below in detail with reference to the drawings.

First Embodiment FIG. 1 shows a first embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 3 according to the conventional example indicate the same parts or corresponding parts.

In this embodiment, the configuration different from the conventional example is as follows.

That is, the outer diameter of the seal retaining ring 7 is set to be slightly smaller than the outer diameter of the outer ring 6, and a predetermined gap h is formed between the outer peripheral surface of the seal retaining ring 7 and the inner peripheral surface of the bearing housing 4. Has been done.

The pins 10 are embedded in the end face of the seal retaining ring 7 on the outer ring 6 side so as to project at a plurality of positions in the circumferential direction, and the pin 10 is attached to the end face of the outer ring 6 on the seal retaining ring 7 side. Is provided with a hole 11 into which is fitted. The pin 10 and the hole 11 allow the roller bearing 3 to move into the bearing housing 4
The seal retaining ring 7 and the outer ring 6 can be easily aligned with each other when they are assembled to each other.

Since the inner diameter of the hole 11 is slightly larger than the diameter of the pin 10, even if the outer ring 6 is deformed due to the deformation of the bearing housing 4, the deformation of the outer ring 6 should not affect the seal retaining ring 7. I am configuring. Of course, the pin 10 and the hole 11
The contact pressure of the seal member 9 with respect to the extending portion 8a of the inner ring 8 is preset so as to be constant in the circumferential direction in a state where the lubricant-sealed bearing unit is incorporated in the roll neck 2 in consideration of the fitting gap with Needless to say.

The other configuration is the same as that of the conventional example, and the description is omitted.

 Next, the operation will be described.

As described above, since the gap h exists between the outer peripheral surface of the seal retaining ring 7 and the inner peripheral surface of the bearing housing 4,
Even if the bearing housing 4 is deformed during operation of the rolling mill, it is possible to prevent the deformation from directly affecting the seal retaining ring 7.

That is, since the seal holding ring 7 is not deformed due to the deformation of the bearing housing 4 and is kept in a stable state without being displaced in the radial direction, the cylindrical portion of the seal member 9 and the inner ring 8 held by the seal holding ring 7 is maintained. The contact pressure with 8a can be prevented from fluctuating, and as a result, desired sealing performance can be stably exhibited.

By the way, since the seal retaining ring 7 is not axially constrained with respect to the outer ring 6, the bearing housing 4 has the roller bearing 3
When assembling, the outer ring 6 and the seal retaining ring 7 may be integrally handled by attaching a jig for fixing the seal retaining ring 7 to the outer ring 6, for example.

Second Embodiment FIG. 2 shows a second embodiment of the present invention. In the figure, the same reference numerals as those given in FIG. 1 according to the first embodiment denote the same parts or corresponding parts.

The structure of this embodiment different from that of the first embodiment is a structure for preventing the seal retaining ring 7 from being displaced in the radial direction with respect to the outer ring 6.

That is, an annular projecting piece 12 protruding in the axial direction is formed on the outer peripheral edge portion of the end face of the seal holding ring 7 on the outer ring 6 side, and the projecting piece 12 is formed on the end face of the outer ring 6 on the seal holding ring 7 side.
An annular step portion 13 that engages with is provided. This piece
The engagement between the step portion 12 and the step portion 13 prevents the seal holding ring 7 from being displaced in the radial direction with respect to the outer ring 6 when the roller bearing 3 is assembled to the bearing housing 4.

The other structure is similar to that of the first embodiment, and the description thereof is omitted.

<Effects of the Invention> According to the present invention, the following effects are exhibited.

By setting the outer diameter of the seal retaining ring smaller than the outer diameter of the bearing outer ring, a predetermined gap is provided between the outer peripheral surface of the seal retaining ring and the inner peripheral surface of the bearing housing, and this gap Since the clearance is set to be larger than the fitting gap between the outer ring and the bearing housing, even if the bearing housing is deformed during operation of the rolling mill, this deformation can be prevented from affecting the seal retaining ring.

Therefore, even if the bearing housing is deformed, the seal retaining ring is not deformed and is not displaced in the radial direction.
The contact pressure between the seal member held by the seal holding ring and the extending portion of the inner ring can be kept constant, and as a result, desired sealing performance can be stably exhibited.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a main part of a lubricant-sealed bearing unit according to a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing a main part of a lubricant-sealed bearing unit according to a second embodiment of the present invention. FIG. 3 is an upper half longitudinal sectional view showing a main part of a lubricant-sealed bearing unit according to a conventional example. DESCRIPTION OF SYMBOLS 1 ... Rolling roll 2 ... Roll neck 4 ... Bearing housing 5 ... Sealing device 6 ... Outer ring 7 ... Seal holding ring 8 ... Inner ring 8a ... Extension part 9 ... Seal member.

Claims (1)

[Scope of utility model registration request] 1. A lubricant-sealed bearing unit which is externally mounted on a roll neck of a rolling roll and has a sealing device provided at an axial end thereof, wherein the sealing device is provided in parallel with an end surface of a bearing outer ring. A ring and a seal member held on the inner diameter side of the seal holding ring in a state of sliding contact with the outer peripheral surface of the extending portion formed on the bearing inner ring, and the outer diameter dimension of the seal holding ring is the outer diameter of the bearing outer ring. By setting the diameter smaller than the diameter dimension, a predetermined gap is provided between the outer peripheral surface of the seal retaining ring and the inner peripheral surface of the bearing housing, and this gap is smaller than the fitting gap between the bearing outer ring and the bearing housing. The lubricant-sealed bearing unit is also characterized by a large size.