JP5786302B2 - Sealed multi-row tapered roller bearings - Google Patents

Description

  The present invention relates to a structure for improving lubricity of a multi-row tapered roller bearing such as a rolling roll bearing used in a steel rolling mill, for example.

Conventionally, to support a rolling roll of a steel rolling mill,
As shown in FIG. 1, the inner ring 1 and the outer ring 2 that are the race rings, the rolling elements 3 that are arranged in a double row so as to be able to roll between the race rings 1 and 2, and the rolling elements 3 are held at equal intervals. A four-row tapered roller bearing 100 comprising a cage 4 is used.
As shown in FIG. 2, the four-row tapered roller bearing 100 is placed in a housing called a chock 200, supports both ends of the rolling roll 10, and supports a radial load and a thrust load.
In the process of rolling a plate-like or wire-like rolled material with a rolling roll 10 to form a plate material and a wire rod, the rolling roll 10 is worn by heavy load contact with the rolled material, and loses its shape. Further, the surface roughness of the rolling roll 10 gradually deteriorates.
The shape and surface roughness of the rolling roll 10 directly affect the shape of the rolled material. When rolling is repeated, the shape and surface roughness of the rolling roll 10 deteriorate, and the shape and dimensional accuracy required for the plate and wire cannot be maintained.

The rolling process includes hot rolling and cold rolling. In the hot rolling, since the temperature of the rolled material is 1000 ° C. or more, the surface wear and deterioration of the rolling roll 10 in contact with the rolled material are remarkable.
In cold rolling, the rolling speed is high (1500 m / min), and the rolling material is hardened during rolling to increase the rolling resistance. Need to be loaded. Therefore, it becomes difficult to maintain an oil film between the rolling material and the rolling roll 10, and lubrication becomes poor. As a result, wear and deterioration of the surface of the rolling roll 10 progress.

  For this reason, the rolling roll 10, the chock 200 and the bearing 100 are taken out from the rolling mill about every 3 hours in the hot rolling mill and about 8 hours in the cold rolling mill, and the correction of the shape and surface roughness has already been completed. The rolling roll is immediately assembled and rolling is performed again.

  The taken-out rolling roll 10 is separated from the chock 200, and the rolling roll 10 is installed in a polishing machine and the roll surface is polished to correct the surface shape and the surface roughness. In addition, the bearing inside the chock 200 is inspected.

  As described above, it is necessary to periodically modify the shape of the surface of the rolling roll 10 for both hot rolling and cold rolling, and in order to increase work efficiency, the inner diameter of the bearing inner ring and the shaft of the rolling roll 10 are fitted with a loose fit. It is combined.

  The open type four-row tapered roller bearing 100 shown in FIG. 2 receives a radial load and a thrust load at the same time. The thrust load is transmitted from the rolling roll shoulder 10a to the inner ring end face 1a of the open type four-row tapered roller bearing 100. Since the inner diameter of the bearing inner ring and the rolling roll shaft 10 are fitted with a loose fit, slip (creep) occurs between the inner diameter of the bearing inner ring and the rolling roll shaft 10. At the same time, slip occurs between the rolling roll shoulder 10a and the bearing inner ring end face 1a. If creep progresses between the inner diameter of the bearing inner ring and the rolling roll shaft 10, there is a possibility that abnormal wear or heat generation may occur between the inner diameter of the bearing inner ring and the rolling roll shaft and between the bearing end surface 1 a and the rolling roll shoulder 10 a. The abnormal wear and heat generation cause bearing abnormality such as dimensional abnormality and thermal crack.

  As a prior art with respect to the above, there is one in which oil air is supplied to the inside of the bearing and oil air is caused to flow from the hole formed in the inner ring to the inner ring inner diameter side, thereby lubricating the fitting portion between the bearing inner ring and the rolling roll to prevent wear. As shown in FIG. 1, a conventional bearing for a steel mill rolling machine is an open type bearing without a bearing sealing seal, so that the lubricant in the bearing is used as a rolling roll shoulder 10a and an inner ring as shown in FIG. By flowing to the end surface 1a, the rolling roll shoulder 10a and the inner ring end surface 1a were lubricated, and the occurrence of abnormal wear due to slipping was suppressed.

JP 2001-90737 A

However, as in the above prior art documents, in order to meet the demands for reducing lubricant consumption, preventing foreign matter (water, scale, etc.) from entering the bearing and preventing lubricant leakage from the bearing in recent years, FIG. A sealed four-row tapered roller bearing 300 having a hermetic seal attached to both end faces of the bearing is becoming mainstream. For this reason, the lubricant may not be sufficiently distributed between the rolling roll shoulder 10a and the bearing inner ring end face 1a as compared with the prior art.
As a countermeasure against the above, when the rolling roll 10 is inserted into the bearing (including the chock 200), a lubricant such as grease is applied to the bearing inner ring end face 1a to prevent abnormal wear of the bearing inner ring end face 1a due to slippage. It was. However, the rolling roll shoulder 10a and the end face of the bearing inner ring are extended due to the increase in the rolling conditions and the rolling operation accompanying the improvement in wear resistance of the rolling roll 10 by further increasing the rolling conditions, increasing the heavy load and improving the material. There is a risk of insufficient lubrication between la, and it is necessary to take further measures against abnormal wear due to slip between the rolling roll shoulder 10a and the bearing inner ring end face 1a.
Therefore, the present invention does not require modification of equipment for a sealed multi-row tapered roller bearing used in a steel equipment rolling mill, and prevents abnormal wear between the rolling roll shoulder 10a and the bearing inner ring end face 1a. It is an issue.

In order to solve the above problem, the invention described in claim 1
A plurality of inner rings, a plurality of outer rings,
A plurality of rollers disposed between the inner ring and the outer ring;
A lubricant encapsulated between the inner ring and the outer ring;
A sealing device disposed between both ends of the inner ring and the outer ring and having a cored bar and a sealing member;
A sealed multi-row tapered roller bearing used by being loosely fitted to a rolling roll of a steel mill,
Of the inner ring, possess the oil groove at least on the inner end surface of the side in contact with the shoulder of the rolling roll, the lubricant is formed in the radial direction of the inner race end surface is filled,
And the inner diameter surface of the inner ring, not through the bearing inner space between the inner ring and the outer ring, have a oil sump is connected with the bottom of the oil groove,
The oil groove and the oil reservoir are provided at a plurality of locations in the circumferential direction of the inner ring,
The sealed multi-row tapered roller bearing, wherein the oil reservoir is formed to have an axial length shorter than a distance from a bottom surface of the oil groove to an inner ring raceway surface.

  The present invention has the above-described configuration, and is provided with an oil groove formed on an end surface of the inner ring and an oil reservoir formed on the inner ring inner diameter surface and connected to the oil groove, and filled with a lubricant. Thus, more lubricant can be retained on the end face of the inner ring, and abnormal wear and damage of the bearing inner ring end face due to slippage between the inner ring end face and the rolling roll shoulder can be prevented over a longer period of time. There is an effect.

It is a figure which shows an open type 4 row tapered roller bearing. The relationship between an open type 4 row tapered roller bearing, a chock, a rolling roll, and the flow of a bearing lubricant is shown. A hermetically sealed four-row tapered roller bearing is shown. FIG. 2 is an enlarged view of a first embodiment of an oil reservoir according to the present invention, (a) a sectional view (b), a front view (c), and an X arrow view. FIG. 3 is an enlarged view (a) a sectional view (b) a front view (c) a Y arrow view of a second embodiment of an oil reservoir according to the present invention.

A first embodiment is shown in FIG.
At least one oil groove 41 is formed on the bearing inner ring end face 1a on the side in contact with the rolling roll shoulder 10a, and the inner diameter end face of the inner ring end face 1a formed with the oil groove 41 is connected to the bottom face of the oil groove 41. An oil sump 42 is formed. The oil sump 42 is formed by cutting the end mill's rotation shaft in a direction perpendicular to the axis of the inner ring 1 and cutting from the inner ring end face 1a to the axial bearing center side.

  When the rolling roll 10 is inserted into the bearing including the chock 200, a lubricant is applied to the bearing inner ring end face 1a, and the oil groove 41 and the oil reservoir 42 are filled with the lubricant. The lubricant to be filled is preferably semi-solid or semi-fluid such as grease that is easily held by the oil groove 41 and the oil reservoir 42. Even if slip occurs between the bearing inner ring end face 1a and the rolling roll shoulder 10a, wear is prevented by the applied lubricant. Further, since the amount of lubricant retained is increased by the oil reservoir 42, it is possible to maintain a good lubrication state even with a sealed bearing.

  Note that the larger the axial dimension of the oil sump 42 is, the larger the amount of lubricant is retained, and the lubrication state can be maintained for a longer period. If the oil sump 42 is formed as far as possible, the strength against the rolling element load in the radial direction will decrease. Therefore, lubrication is achieved by making the axial length of the oil reservoir 42 shorter than the distance from the bottom surface of the oil groove 41 to the endmost surface side of the inner ring raceway surface 33 and forming the oil groove 41 and the oil reservoir 42 at a plurality of locations. It is preferable to ensure the amount of the agent retained.

A second embodiment is shown in FIG. The oil sump 43 is formed by cutting the end mill rotational axis parallel to the axis of the inner ring 1 and radially outward from the inner ring inner surface. Others are the same as the first embodiment.
The oil sump 42 and 43 and the width of the oil groove 41 need not be matched. Moreover, the shape of the oil sumps 42 and 43 is not limited by an Example, It can change suitably.

  It can be used as a sealed multi-row tapered roller bearing.

DESCRIPTION OF SYMBOLS 1 Inner ring 1a Inner ring end surface 2 Outer ring 3 Rolling element 4 Cage 10 Rolling roll 10a Rolling roll shoulder 20 Housing 21 Housing lid 22 Housing lid 23 Thrust collar 24 Split ring 25 Elastic seal 31 Seal holder 32 Seal seal 33 Inner ring raceway surface 41 Oil groove 42 Oil reservoir (Example 1)
43 Oil reservoir (Example 2)
100 Open Type 4 Row Tapered Roller Bearing 200 Chock 300 Sealed 4 Row Tapered Roller Bearing A Flow of Lubricant

Claims (1)

A plurality of inner rings, a plurality of outer rings,
A plurality of rollers disposed between the inner ring and the outer ring;
A lubricant encapsulated between the inner ring and the outer ring;
A sealing device disposed between both ends of the inner ring and the outer ring and having a cored bar and a sealing member;
A sealed multi-row tapered roller bearing used by being loosely fitted to a rolling roll of a steel mill,
Of the inner ring, possess the oil groove at least on the inner end surface of the side in contact with the shoulder of the rolling roll, the lubricant is formed in the radial direction of the inner race end surface is filled,
And the inner diameter surface of the inner ring, not through the bearing inner space between the inner ring and the outer ring, have a oil sump is connected with the bottom of the oil groove,
The oil groove and the oil reservoir are provided at a plurality of locations in the circumferential direction of the inner ring,
The sealed multi-row tapered roller bearing, wherein the oil reservoir is formed to have an axial length shorter than a distance from a bottom surface of the oil groove to an inner ring raceway surface.

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