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Bearing arrangement

a bearing arrangement and bearing technology, applied in the direction of elastic bearings, machines/engines, liquid fuel engines, etc., can solve the problems of different amounts of radial expansion along the shaft, difficult to achieve uniform distribution along the shaft, and difficult to achieve uniform distribution. , to achieve the effect of reducing the impact of coning

Inactive Publication Date: 2013-06-13
ROLLS ROYCE PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect is to provide a bearing arrangement that reduces the impact of coning.

Problems solved by technology

The temperature distribution along the shaft is often non-uniform which causes different amounts of radial expansion along its length.
Coning can be particularly problematic when it occurs in the vicinity of the bearings since it can lead to uneven loading across the bearing.
In particular, it can increase edge loading of the bearing races.
This is undesirable because it creates uneven stress distributions across the bearing which can reduce the operational life of the bearings.
Furthermore, where bearings are preloaded, for instance to minimise skidding of lightly loaded rolling elements, the problem is exacerbated.

Method used

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Embodiment Construction

[0026]FIG. 1 shows a stub-shaft assembly 2 comprising a shaft 4, for example a main driveshaft of a gas turbine, supported by a roller bearing 6. The shaft 4 defines a rotational axis 8 about which the shaft 4 rotates. The bearing 6 comprises an outer race 10 and an inner race 12, between which rollers 14 are disposed. The inner and outer races 10, 12 are annular. The inner and outer races 10, 12 may each have cylindrical cross-section or may be lobed, for example the outer race 10 shown in FIG. 1 may be a tri-lobed ring. The rollers 14 are held for rotation by a cage 16 and by a groove 17 in the radially outer surface of the inner race 12 which restricts axial displacement of the rollers 14.

[0027]The shaft 4 is hollow and has a radially outer surface 18 and a radially inner surface 20. The shaft 4 comprises a recess 22 formed in the outer surface of the shaft 4 towards an end of the shaft 4. The recess 22 extends circumferentially about the entire shaft 4. The recess 22 has a botto...

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Abstract

A bearing arrangement 2 comprising an outer race 10, a shaft 4 arranged to rotate with respect to the outer race 10 thereby defining an axis of rotation 8 of the shaft 4. The shaft 4 and the outer race 10 are arranged to define a region of overlap between the shaft 4 and the outer race 10 along the axis of rotation. An inner race 12 is disposed between the outer race 10 and the shaft 4 in the region of overlap and coupled for rotation with the shaft 4, the inner race 12 and the shaft 4 defining an annular reservoir 40 between them for accommodating radial expansion of the shaft 4 or radial displacement of the shaft 4 with respect to the axis of rotation 8.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is based upon and claims the benefit of priority from British Patent Application Number 1121162.0 filed 9 Dec. 2011, the entire contents of which are incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates to a bearing arrangement.[0004]2. Description of the Related Art[0005]Roller bearings are often used to support driveshafts in turbine engines. Typically, each roller bearing comprises an inner race arranged to rotate with the driveshaft, and an outer race fixed to the main body of the engine. Roller elements are disposed between the inner and outer races to allow rotation of the races with respect to each other.[0006]In use, the driveshaft is exposed to elevated temperatures which heat the driveshaft and cause it to expand radially. The temperature distribution along the shaft is often non-uniform which causes different amounts of radial expansion along its lengt...

Claims

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Application Information

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IPC IPC(8): F01D25/16
CPCF01D25/164F01D25/16F16C27/04F16C19/26F16C19/525F16C2360/23F16C33/6677F16C27/045
Inventor SINIAWSKI, RICHARD ANDREW
Owner ROLLS ROYCE PLC