Performance of a Large Thrust Bearing with Minimized Thermal Distortion

Kawaike, Kazuhiko; OKANO, KAZUNORI; Furukawa, Yôko

doi:10.1080/05698197908982908

Cited by 27 publications

(13 citation statements)

References 4 publications

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“…Similar probes were used apparently by Kawaike el al. (6) and by Tanaka et al (7) (who also placed them in the rotor). The probes were mounted vertically in holes of 19 mrn diameter just beneath the rotating ring surface (0.2-0.5 mm), as done by Tanaka et al (7) and epoxy was used as a grouting agent.…”

Section: Instrumentationmentioning

confidence: 94%

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Spring-Supported Thrust Bearings Used in Hydroelectric Generators: Laboratory Test Facility©

Yuan

Medley

Ferguson³

1999

Tribology Transactions

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A test facility was developed for the experimerltal investigation ofthe large spring-supported thrust bearings used in hydroelectric getzercitors. The test bearing had an outer diameter of 1.168 m, ihus making it large enough to simulate most of the features of the tlzrcisl bearings in the field, yet small enough to be placed convetlierztly in a11 engineering laboratoty. It~strumentation included a distributiotl of thennocociples and pressure taps along wirh disl~lace~nenr probes of eddy current type that were located in rhe rntor to measure oil filtn thickness. A detailed description of rhe lest facility was provided alottg with some representative results crrrrl a descriptiot~ of sotne experimental d~ficulties. A survey of the ~.elevatzt literature published in the past 40 years suggested that rlzis apparatus was ~iniqcie it1 its ability to study relatively large spring-supporied thrust bearings in the laboratory.

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Section: Instrumentationmentioning

confidence: 94%

“…A test facility was built by Kawaike et al (6) to study the thermal distortion in pivoted sector pad thrust bearings (Table 1). The loading system consisted of a hydraulic piston acting on the rotor through a hydrostatic bearing.…”

Section: Present Studymentioning

confidence: 99%

Spring-Supported Thrust Bearings Used in Hydroelectric Generators: Laboratory Test Facility©

Yuan

Medley

Ferguson³

1999

Tribology Transactions

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“…free surfaces of the pad. Kaiwaicke [13] has shown experimentally that the thermal distortion of shoes is crucial to the performance of large bearings. Have the authors obtained any insight as to appropriate values of surface heat transfer coefficient?…”

Section: MCC Ettlesmentioning

confidence: 99%

Discussion: “A Three-Dimensional Analysis of Thermohydrodynamic Performance of Sector-Shaped, Tilting-Pad Thrust Bearings” (Kim, Kyung Woong, Tanaka, Masato, and Hori, Yukio, 1983, ASME J. Lubr. Technol., 105, pp. 406–412)

Etsion

1983

Journal of Lubrication Technology

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rises gradually from T d ( = r in ), and then steeply near the pad surface.As discussed so far, this 3-D analysis can investigate the bearing performance more extensively and more precisely than is possible with the 2-D analysis, and the results obtained with the former often differ from "those obtained with the latter both qualitatively and quantitatively. From the view point of safe operation of bearings, the 2-D analysis should not be adopted because it tends to underestimate maximum temperature rise and minimum film thickness decrease, even though it has the advantage of greatly shortening the calculation time. ConclusionThe authors have analyzed the thermohydrodynamic performance of sector-shaped thrust pad bearing which can tilt both radially and circumferentially, taking into account the three-dimensional variation of lubricant viscosity and density. The temperature distribution in the pad and film were also investigated. The effect of pivot position, disk speed, minimum film thickness, inlet temperature of lubricant, ambient temperature and heat transfer coefficient were elucidated. The results were considerably different from those obtained when the isoviscous or the two-dimensional THD analysis is used. It was shown that the two-dimensional analysis can not substitute for the three-dimensioal analysis. The present theory predicts the bearing performance more accurately and is considered to be useful for design purpose.

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“…In these patents, the cold lubricating oil can naturally flow within channels, pipes or holes of the bearing, or are externally fed by a suitable nozzle system. Kawaike et al in [17] investigated the influence of thermal distortion on a large thrust bearing and proposed the adoption of tangential cooling ducts in the pads where the lubricating oil can naturally flow within them. The pads are comprised of two layers that are mechanically joined and the ducts are obtained by milling machining on the upper surface of the lower layer.…”

Section: Introductionmentioning

confidence: 99%

Cooled Pads for Tilting-Pad Journal Bearings

et al. 2019

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Tilting-pad journal bearings (TPJBs) are widely installed in rotating machines owing to their high stability, but some drawbacks can be noted, such as higher cost with respect to cylindrical journal bearings and thermal issues. High temperatures in the pads correspond to low oil-film thicknesses and large thermal deformations in the pads. Therefore, the restriction of the maximum temperature of the bearing is a key aspect for oil-film bearings. The temperature reduction is generally obtained by adopting higher oil inlet flowrates or suitable oil nozzles. In this paper, the idea of using cooled pads with internal channels in which an external cooling fluid is circulated will be applied to a TPJB for the first time. The three-dimensional TEHD model of the TPJB, equipped with a cooled pad, will be introduced, and the results of the numerical simulations will be discussed. Several analyses have been performed in order to investigate the influence of cooling conditions, such as the type, flowrate, inlet temperature and number of cooled pads. Two types of pad geometry with different cross-sections of the cooling circuit, namely, circular and six-square multi-channel sections, have been compared to the reference bearing with solid pads. Simple experimental tests were performed by means of a test rig equipped with a cooled pad bearing obtained with the additive manufacturing process, thus showing the effectiveness of the solution and the agreement with the predictions.

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Performance of a Large Thrust Bearing with Minimized Thermal Distortion

Cited by 27 publications

References 4 publications

Spring-Supported Thrust Bearings Used in Hydroelectric Generators: Laboratory Test Facility©

Spring-Supported Thrust Bearings Used in Hydroelectric Generators: Laboratory Test Facility©

Discussion: “A Three-Dimensional Analysis of Thermohydrodynamic Performance of Sector-Shaped, Tilting-Pad Thrust Bearings” (Kim, Kyung Woong, Tanaka, Masato, and Hori, Yukio, 1983, ASME J. Lubr. Technol., 105, pp. 406–412)

Cooled Pads for Tilting-Pad Journal Bearings

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