JPH022482Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention relates to a bearing for a roll neck of a rolling mill, in particular, the invention has at least two inner rings and multiple rows of tapered rollers or cylindrical rollers, and the outer end of the bearing in the axial direction This invention relates to a sealing device for a sealed multi-row roller bearing, which is sealed with an appropriate sealing device.

BACKGROUND OF THE INVENTION Modern rolling mills use a large amount of cooling water to improve rolling accuracy, and this water irrigates the roll neck bearings that support the rolling rolls.

If such cooling water, rolling oil, scale, etc. enter the inside of the bearing in the axle box, the life of the bearing will be significantly shortened, and it will also cause vibration and deteriorate rolling accuracy.

Therefore, a sealing device as shown in Japanese Patent Publication No. 55-22648, for example, has been proposed. As illustrated in FIG. 1, this means that the roll neck 8 is
A bearing 1 that is journalled within at least two inner rings 2
and a spacer 6 are loosely fitted into a roll neck 8 to form a four-row tapered roller bearing, and the seal member 5 is held in a seal holding ring 4 which is fitted concentrically to the outer end surface of the outer ring 3 via a pilot part 4a. The seal lip is brought into sliding contact with the extension 2a of the inner ring 2 to form a sealed type. Note that contact type sealing devices 9a, 9b, 9c are provided between the axle box 7 and the roll neck 8.
etc., to further improve sealing performance.

However, as mentioned earlier, in this type of bearing device, the roll neck and inner ring are loosely fitted in order to handle the bearing and roll, so cooling water and rolling oil that have entered the axle box are , scale, etc. cannot be prevented from entering the bearing through the gap between the roll neck and the inner ring, that is, the gap between the mating surface of the inner ring and the spacer along the inner diameter surface of the inner ring, and the bearing cannot be prevented from entering the bearing from this area. Since it is not possible to prevent the lubricant (grease) from flowing out, there is an inconvenience that the sealing effect is reduced due to these reasons.

On the other hand, in order to prevent such inconvenience, a sealing member is provided on the inner diameter of the spacer to seal the gap between the mating surfaces between the spacer and the inner ring, as shown in Japanese Patent Application Laid-Open No. 54-69639. Something has been proposed. In other words, there is a spacer in which a seal member is fixed to the inner surface of the spacer that extends to a large chamfered slope formed on the inner surface of the inner ring, and the seal lip slides against the slope. Since it is necessary to provide a certain degree of thickness in the radial direction and to prevent the seal member and the roll neck from contacting each other, it is necessary to make the chamfered slope on the inner diameter surface of the inner ring considerably large. It is inevitable that the radial thickness of the spacer side end face of the inner ring becomes extremely thin. The fact that the inner ring end is thinner and the area of its end face is smaller means that, since the fit between the inner ring and the roll neck is loose-fit, the sliding surface pressure during the relative sliding movement between the inner rings is extremely high. As a result, smooth relative sliding operation cannot be obtained, and wear of the inner ring end face is accelerated, resulting in increased play in the axial direction.

Purpose of the invention This invention eliminates the drawbacks of the conventional device as described above, further improves the sealing effect, and prevents the reduction in the thickness of the inner ring end, that is, the area of the inner ring end surface, and improves the sealing effect between the inner rings. The purpose is to reduce the sliding surface pressure during relative sliding motion.

Characteristics of the invention This invention, especially in a sealed multi-row roller bearing for the roll neck of a rolling mill, forms a spacer interposed between two inner rings into an annular body with a T-shaped cross section and a cylindrical portion on the outer periphery. , an elastic seal in which a shallow stepped portion is formed on the outer periphery of the spacer side end of the two inner rings, the cylindrical portion of the spacer is positioned on the outer periphery of the stepped portion, and is held on the inner diameter of the cylindrical portion of the spacer. This is characterized in that the seal lip on the inner circumference of the member is brought into sliding contact with the outer circumferential surface of the stepped portion of the inner ring.

Embodiment FIG. 2 is a diagram showing an embodiment embodying this invention. In this case, the bearing 10 is a multi-row tapered roller bearing having four rows of tapered rollers 11, and the outer ring 12 is divided into a plurality of parts. , an outer ring spacer 13, two divided inner rings 14, and a spacer 15 interposed between both inner rings, and a plurality of sealing rings 16, 17, 18, 19,20
The labyrinth 21 is configured by attaching the 1000 to a non-contact type sealing device. Note that the bearing 10 is not limited to the one shown in the drawings, and may be a multi-row cylindrical roller bearing or other multi-row roller bearings, and the sealing devices at both axially outer ends may also include elastic seals in addition to those shown in the drawings. It can be a contact type sealing device using members, and these forms are arbitrary.

In the above configuration, a stepped portion 22 is provided on the outer periphery of the spacer 15 side end of both inner rings 14 that are fitted in a loose fit in parallel to a roll neck (not shown),
A cylindrical portion 23 facing the outer periphery of the stepped portion 22 is formed on the outer periphery of the spacer 15, so that the spacer 15 is formed into an annular body having a T-shaped cross section.

A circumferential groove 24 is provided on the inner diameter surface of the cylindrical portion 23 of the spacer 15, and an elastic sealing member 26 having an annularly formed coil spring 25 embedded in the outer circumference is inserted into the circumferential groove 24 via the spring 25. Fit and fix,
Seal lip 2 formed on the inner periphery of the seal member 26
7 is brought into sliding contact with the outer peripheral surface of the stepped portion 22 of the inner ring 14 with an appropriate contact pressure.

The annular coil spring 25 is given an outward expansion force to cause the spacer 1 of the elastic seal member 26 to
5, and the contact pressure of the seal lip 27 to the inner ring stepped portion 22 is controlled by the cylindrical portion 2 of the spacer 15.
3 to hold it properly.

Note that the elastic seal member 26 is attached to the spacer 15 by not using the annular coil spring 25, but by, for example, adhesion, or by baking the elastic seal member 26 onto a metal shell and press-fitting it into the inner diameter of the cylindrical portion 23. In addition, the stepped portion 22 is configured to have a thickness as shallow as possible to make the end of the inner ring 14 sufficiently thick so as not to reduce the area of the end surface. It is desirable to take this into account.

In the embodiment of FIG. 3, the elastic seal member 26
In addition, an annular lip 28 extends outward in the axial direction.
An example is shown in which the sealing function is further improved by forming a seal and slidingly contacting the end face of the stepped portion 22.

In FIG. 2, 29 is an O-ring (not shown) that seals between the axle box and the bearing.

Effects As described above, this invention provides a cylindrical part so that the spacer has a T-shaped cross section on the outer periphery of the spacer interposed between two or more separated inner rings. Since a seal member is attached to the inner circumferential surface and a seal lip is brought into sliding contact with the outer circumferential surface of the end of the spacer side of the inner ring, (1) Cooling water flows from the fit gap in the loose fit fit between the roll neck and the inner ring.
Even if rolling oil, scale, etc. may enter the bearing, the sealing member completely prevents these from entering the bearing and prevents grease from flowing out. Significantly improves the sealing performance of roller bearings, extends the bearing life, and prevents vibrations in the bearings due to the intrusion of foreign matter, thereby preventing deterioration in rolling accuracy.

(2) The step provided on the outer periphery of the spacer side end of the inner ring can be formed shallowly as long as it does not interfere with the sliding contact of the seal lip, and therefore there is no problem of significantly reducing the thickness of the end. , a sufficient area of the inner ring end face can be ensured, preventing an increase in sliding surface pressure during relative sliding movement of the inner ring, and eliminating problems such as wear and galling of the end face.

(3) Even if the spacer is formed to have a T-shaped cross section, there is no difficulty in securing enough space to prevent interference between the spacer and the rolling element cage. By attaching the seal member using a coil spring, etc., it is easy to install, and there is no risk of the seal lip of the seal member being rolled up when assembling the bearing. is easy.

etc. will be effective.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing an example of a conventional sealed multi-row roller bearing for the roll neck of a rolling mill, Fig. 2 is a longitudinal cross-sectional view showing an enlarged main part of an embodiment of this invention, and Fig. 3 is another example. FIG. 2 is a vertical cross-sectional view showing only the main parts of the embodiment. 10...Bearing, 12...Outer ring, 14...Inner ring,
15... Spacer, 21... Labyrinth, 22... Step part, 23... Cylindrical part, 24... Circumferential groove, 25... Coil spring, 26... Seal member, 27, 2
8... Seal lip.

Claims (1)

[Claims for Utility Model Registration] (1) In a sealed multi-row roller bearing for a roll neck of a rolling mill, which is provided with at least two inner rings and has a spacer between the inner rings arranged in parallel on the same axis, A stepped portion is provided on the outer periphery of the end on the seat side, and the spacer is formed into an annular body having a T-shaped cross section with a cylindrical portion located on the outer periphery of the inner ring stepped portion, and a seal lip is provided on the inner diameter of the cylindrical portion of the spacer. A sealing device for a bearing for a roll neck of a rolling mill, which is equipped with a sealing member made of an elastic material that is in sliding contact with the outer periphery of an inner ring step. (2) A claim for utility model registration in which a ring-shaped coil spring is embedded in the seal member, and the ring-shaped coil spring is engaged in a circumferential groove formed on the inner surface of the cylindrical portion of the spacer to fix the seal member to the spacer. A sealing device for a bearing for a roll neck of a rolling mill according to scope No. (1). (3) The sealing device for a bearing for a roll neck of a rolling mill according to claim 1 or 2, wherein the sealing member has an annular lip that slides into contact with the end face of the stepped portion of the inner ring.