GB2155563A

GB2155563A - A roller bearing

Info

Publication number: GB2155563A
Application number: GB08506272A
Authority: GB
Inventors: Heribert Reusch
Original assignee: SKF GmbH
Current assignee: SKF GmbH
Priority date: 1984-03-13
Filing date: 1985-03-11
Publication date: 1985-09-25
Also published as: FR2561331B1; FR2561331A1; GB2155563B; GB8506272D0

Abstract

A roller bearing 13 is disclosed for mounting for example the excitation shaft of a tubular ball mill. The bearing 13 has two rows of rollers 14, a single outer race ring 15 common to both rows, and two inner race rings 18. The outer race ring 15 has no flanges fixed thereto for positioning the rollers 14, and each inner race ring 18 has flanges 20. Each cage 23 is guided by the flanges 20. Means, for example a shaft collar 21, spaces the two inner race rings 18 axially from each other. <IMAGE>

Description

SPECIFICATION A roller bearing This invention concerns a roller bearing, for example for mounting the excitation shaft of a tubular ball mill.

Patent Specification DE (OLS) 1605119 discloses a shaft mounted for rotation in a housing by a roller bearing comprising two annular rows of rollers. The bearing has two radially outer race rings one for each row of rollers, each outer rate ring having flanges fixed with respect thereto and axially positioning the rollers of the respective row. The outer race rings are positioned in a bore of the housing abutting each other. The bearing also has a single radially inner race ring which is common to both rows and provides two radially inner race tracks. This inner race ring has no flanges fixed with respect thereto.

The assembly of such a construction can, in certain circumstances, be difficult particularly if, for example, the bearing outer rings are to be an interference fit in the bore of the housing and the housing cannot be heated because it is too big. Cooling of the complete bearing or of the outer rings with the rows of rollers is relatively completed during assembly.

The invention provides a roller bearing comprising two annular rows of rollers, a single radially outer race ring which is common to both rows and provides two radially outer race tracks, which outer race ring has no flanges fixed with respect thereto, two radially inner race rings one for each row of rollers, each inner race ring having flanges fixed with respect thereto and axially positioning the rollers of the respective row, two cages one for each row of rollers, each cage being guide by the flanges of the respective inner race ring, and means spacing the two inner race rings axially from each other.

The means may be a shoulder of a shaft, a collar or a loose ring.

Such a construction can be relatively easy to assemble since, for an interference fit, only the single outer race ring need be cooled and positioned in the bore of a housing.

Preferably the outer race ring has a recess on its radially inner surface between the two race tracks and one or more bores extend radially through the outer race ring and open into the recess. These features allow the bearing to be readily lubricated with, for example, grease.

An embodiment of the invention will now be described by way of example, reference being made to the accompanying drawing, which is a longitudinal section of part of a shaft mounted in a housing by a roller bearing.

The apparatus shown in the drawing comprises a housing 10 having two end covers 11, and a shaft 12 which extends in the housing and is mounted for rotation by a double-row cylindrical roller bearing 1 3.

The bearing 1 3 comprises two annular rows of cylindrical rollers 14 and a single radially outer race ring 1 5 which is common to both rows and provides two radially outer race tracks 16, one for each row. The outer ring 1 5 is located in a bore of the housing axially between two flange end rings 1 7 and the housing end covers 11. The outer race ring 1 5 has no flanges fixed thereto for axially positioning the rollers 14 but the rollers are located axially in one direction by the end flange rings 17, each of which has a surface facing one end of each of the rollers of one row.

The bearing 1 3 also comprises two radially inner race rings 1 8 one for each row of rollers 14 and each providing a race track 1 9 for the rollers. Each inner race ring 18 has two annular flanges 20 extending radially outwardly one from each axial end of the ring.

The inner race rings 1 8 are mounted on the shaft 1 2 and abut and are axially spaced from each other by a collar 21 of the shaft. The inner race rings 1 8 are located at their other ends by spacer rings 22. The rollers 14 of each row are located in a cage 23, each cage being guided by the annular axially extending surfaces 24 of the flanges of the respective inner race rings 1 8.

For lubrication of the bearing 13, the outer race ring 1 5 has an annular recess 25 on its radially inner surface between the two race tracks 1 6 and one or more bores 26 extend radially through the outer race ring 1 5 and open into the recess 25. Further bores 27 extend radially through the outer race ring 1 5 and open into the race tracks 1 6 for directly lubricating the race tracks.

When mounting the bearing 13, firstly the outer ring 1 5 is inserted into the bore of the housing 1 0. For an interference fit, the outer race ring 1 5 is simply cooled and then positioned. The inner race rings 18 with their respective rows of rollers 1 4 are then pushed onto the shaft 1 2 until they abut the end faces of the shaft collar 21. After the end flange rings 1 7 and spacer rings 22 have been inserted, the housing end covers 11 are positioned and screwed to the housing 10.

1. A roller bearing comprising two annular rows of rollers, a single radially outer race ring which is common to both rows and provides two radially outer race tracks, which outer race ring has no flanges fixed with respect thereto, two radially inner race rings one for each row of rollers, each inner race ring having flanges fixed with respect thereto and axially positioning the rollers of the respective row, two cages one for each row of rollers, each cage being guided by the flanges of the

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A roller bearing This invention concerns a roller bearing, for example for mounting the excitation shaft of a tubular ball mill. Patent Specification DE (OLS) 1605119 discloses a shaft mounted for rotation in a housing by a roller bearing comprising two annular rows of rollers. The bearing has two radially outer race rings one for each row of rollers, each outer rate ring having flanges fixed with respect thereto and axially positioning the rollers of the respective row. The outer race rings are positioned in a bore of the housing abutting each other. The bearing also has a single radially inner race ring which is common to both rows and provides two radially inner race tracks. This inner race ring has no flanges fixed with respect thereto. The assembly of such a construction can, in certain circumstances, be difficult particularly if, for example, the bearing outer rings are to be an interference fit in the bore of the housing and the housing cannot be heated because it is too big. Cooling of the complete bearing or of the outer rings with the rows of rollers is relatively completed during assembly. The invention provides a roller bearing comprising two annular rows of rollers, a single radially outer race ring which is common to both rows and provides two radially outer race tracks, which outer race ring has no flanges fixed with respect thereto, two radially inner race rings one for each row of rollers, each inner race ring having flanges fixed with respect thereto and axially positioning the rollers of the respective row, two cages one for each row of rollers, each cage being guide by the flanges of the respective inner race ring, and means spacing the two inner race rings axially from each other. The means may be a shoulder of a shaft, a collar or a loose ring. Such a construction can be relatively easy to assemble since, for an interference fit, only the single outer race ring need be cooled and positioned in the bore of a housing. Preferably the outer race ring has a recess on its radially inner surface between the two race tracks and one or more bores extend radially through the outer race ring and open into the recess. These features allow the bearing to be readily lubricated with, for example, grease. An embodiment of the invention will now be described by way of example, reference being made to the accompanying drawing, which is a longitudinal section of part of a shaft mounted in a housing by a roller bearing. The apparatus shown in the drawing comprises a housing 10 having two end covers 11, and a shaft 12 which extends in the housing and is mounted for rotation by a double-row cylindrical roller bearing 1 3. The bearing 1 3 comprises two annular rows of cylindrical rollers 14 and a single radially outer race ring 1 5 which is common to both rows and provides two radially outer race tracks 16, one for each row. The outer ring 1 5 is located in a bore of the housing axially between two flange end rings 1 7 and the housing end covers 11. The outer race ring 1 5 has no flanges fixed thereto for axially positioning the rollers 14 but the rollers are located axially in one direction by the end flange rings 17, each of which has a surface facing one end of each of the rollers of one row. The bearing 1 3 also comprises two radially inner race rings 1 8 one for each row of rollers 14 and each providing a race track 1 9 for the rollers. Each inner race ring 18 has two annular flanges 20 extending radially outwardly one from each axial end of the ring. The inner race rings 1 8 are mounted on the shaft 1 2 and abut and are axially spaced from each other by a collar 21 of the shaft. The inner race rings 1 8 are located at their other ends by spacer rings 22. The rollers 14 of each row are located in a cage 23, each cage being guided by the annular axially extending surfaces 24 of the flanges of the respective inner race rings 1 8. For lubrication of the bearing 13, the outer race ring 1 5 has an annular recess 25 on its radially inner surface between the two race tracks 1 6 and one or more bores 26 extend radially through the outer race ring 1 5 and open into the recess 25. Further bores 27 extend radially through the outer race ring 1 5 and open into the race tracks 1 6 for directly lubricating the race tracks. When mounting the bearing 13, firstly the outer ring 1 5 is inserted into the bore of the housing 1 0. For an interference fit, the outer race ring 1 5 is simply cooled and then positioned. The inner race rings 18 with their respective rows of rollers 1 4 are then pushed onto the shaft 1 2 until they abut the end faces of the shaft collar 21. After the end flange rings 1 7 and spacer rings 22 have been inserted, the housing end covers 11 are positioned and screwed to the housing 10. CLAIMS

1. A roller bearing comprising two annular rows of rollers, a single radially outer race ring which is common to both rows and provides two radially outer race tracks, which outer race ring has no flanges fixed with respect thereto, two radially inner race rings one for each row of rollers, each inner race ring having flanges fixed with respect thereto and axially positioning the rollers of the respective row, two cages one for each row of rollers, each cage being guided by the flanges of the respective inner race ring, and means spacing the two inner race rings axially from each other.

2. A roller bearing as claimed in Claim 1, wherein the outer race ring has a recess on its radially inner surface between the two race tracks and one or more bores extend radially through the outer race ring and open into the recess.

3. A roller bearing substantially as herein described to and as shown in the accompanying drawing.

4. A mounting, for example for the excitation shaft of a tubular ball mill, with a doublerow roller bearing in which one bearing ring is designed in one piece without flanges and the other bearing ring comprises two separate rings provided with fixed flanges, characterised in that the two inner rings provided with fixed flanges, on the shoulder surfaces of which the cages are supported with little play, are arranged spaced apart axially by a shoulder, shaft collar or the like.

5. A mounting according to Claim 4, characterised in that between the raceways the outer ring has a recess and lubrication bores.