An Overview of Performance Characteristics, Experiences and Trends of Aerospace Engine Bearings Technologies

Ebert, Franz-Josef

doi:10.1016/s1000-9361(07)60058-2

Cited by 40 publications

(9 citation statements)

References 3 publications

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“…As a type of mature industrial product with a long history [26], REBs have proved their reliability under the most diverse operational conditions [27,28]. The typical REBs consist of rollers, inner ring, outer ring and retainer.…”

Section: Structural Improvements Of Rebsmentioning

confidence: 99%

An Overview of Bearing Candidates for the Next Generation of Reusable Liquid Rocket Turbopumps

Miao

et al. 2020

Chin. J. Mech. Eng.

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There is a consensus in the aerospace field that the development of reusable liquid rockets can effectively reduce the launch expense. The pursuit of a long service life and reutilization highly depends on the bearing components. However, the rolling element bearings (REBs) used in the existing rocket turbopumps present obvious and increasing limitations due to their mechanical contacting mode. For REBs, high rotational speed and long service life are two performance indexes that mutually restrict each other. To go beyond the DN value (the product of the bearing bore and rotational speed) limit of REBs, the major space powers have conducted substantial explorations on the use of new types of bearings to replace the REB. This review discusses, first, the crucial role of bearings in rocket turbopumps and the related structural improvements of REBs. Then, with the prospect of application to the next generation of reusable liquid rocket turbopumps, the bearing candidates investigated by major space powers are summarized comprehensively. These promising alternatives to REBs include fluid-film, foil, and magnetic bearings, together with the novel superconducting compound bearings recently proposed by our team. Our more than ten years of relevant research on fluid-film and magnetic bearings are also introduced. This review is meaningful for the development of long-life and highly reliable bearings to be used in future reusable rocket turbopumps.

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Section: Structural Improvements Of Rebsmentioning

confidence: 99%

An Overview of Bearing Candidates for the Next Generation of Reusable Liquid Rocket Turbopumps

Miao

et al. 2020

Chin. J. Mech. Eng.

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“…Sci. 2016, 6, 415 4 of 11 Variable δ 1jkh and δ 2jkh can be obtained based on the geometric shape of the deformed raceways, thus, with the rollers' loads on the inner ring and the applied load of the ring from the shaft, the ring balance equation can be obtained, as expressed in Equation (3). The cage balance equation can be obtained using the method of Cui [16].…”

Section: Modified Noncircular Rolling Bearing Quasi-dynamic Modelmentioning

confidence: 99%

“…Subsequently, many researchers studied the behaviors of rolling bearings [2][3][4][5], however, most of their methods are built using the rigid structure hypothesis, considering the rings as constant geometry parts, and ignoring the elastic deformations of the structures under load. Thus, these rigid structure assumption models cannot fully meet the demands of the continued development of rolling bearings, because the structural deformation of thin-walled rings and flexible supports is much more pronounced.…”

Section: Introductionmentioning

confidence: 99%

Study on the Load Distribution and Dynamic Characteristics of a Thin-Walled Integrated Squirrel-Cage Supporting Roller Bearing

Wang

Zhang

2016

Applied Sciences

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Thin-walled integrated flexible support structures are the major trend in the development of current rolling bearing technology. A thin-walled, integrated, squirrel-cage flexible support roller bearing, quasi-dynamic iterative finite element analysis (FEA) model is established in this paper. The FEA model is used to calculate the structural deformation of the thin-wall rings and support structures; the dynamic characteristics of the bearing are analyzed using the noncircular bearing modified quasi-dynamic model. The influence of the integrated flexible support structure on the internal load distribution and the dynamic characteristics of the roller bearing are analyzed. The results indicate that with the support of a flexible squirrel-cage, the maximum contact load is decreased by 14.2%, the loading region is enlarged by 25%, the cage slide ratio is reduced by 24%, and the fatigue life is increased by more than 50%. In addition, as the ring wall thickness increased, the results increasingly approached those under a rigid assumption.

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“…Aero-engine is the 'hear' of the airplane, and bearing is the critical safety component and core foundation department unit. Because of the harsh environment of aero-engines operation, the bearing material should have high reliability, high contact fatigue life and excellent dimensional stability [1][2][3]. M50 bearing steel is a high speed steel with high contents of Cr and Mo, and it was developed in 1950s and used widely as the bearing material of aeroengine [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Dry tribological properties of M50 bearing steel under different temperatures

Guo¹,

Duan²,

Wang³

et al. 2022

Mater. Res. Express

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Reducing wear and clarifying relation mechanism are essential to improve the life of engine bearings, so we investigate the influence of ambient temperature on the friction characteristics of M50 steel self-matching pairs under dry friction conditions. As the ambient temperature increases from 30 ℃ to 500 ℃, friction coefficient decreases sharply from 0.78 and tends to be stable around 0.4, while wear rate firstly decreases and then increases. High temperature (More than 300℃) induces the serious oxidation and softening on the wear surface, causing the main wear mode from abrasive wear to adhesive wear. The oxides include mainly of Fe2O3 and Fe3O4, and minor MoO3 and Cr2O3, which are benefit for forming a continuous tribolayer on the wear surface, thereby improving the friction performance.

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An Overview of Performance Characteristics, Experiences and Trends of Aerospace Engine Bearings Technologies

Cited by 40 publications

References 3 publications

An Overview of Bearing Candidates for the Next Generation of Reusable Liquid Rocket Turbopumps

An Overview of Bearing Candidates for the Next Generation of Reusable Liquid Rocket Turbopumps

Study on the Load Distribution and Dynamic Characteristics of a Thin-Walled Integrated Squirrel-Cage Supporting Roller Bearing

Dry tribological properties of M50 bearing steel under different temperatures

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