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Open AccessArticle

Cooled Pads for Tilting-Pad Journal Bearings

1
Politecnico di Milano, Department of Mechanical Engineering, Via G. La Masa 1, 20156 Milan, Italy
2
Department of Mechanical Engineering, The University of Danang–Danang University of Science and Technology, 54 Nguyen Luong Bang Street, Danang, Vietnam
*
Author to whom correspondence should be addressed.
Lubricants 2019, 7(10), 92; https://doi.org/10.3390/lubricants7100092
Received: 11 September 2019 / Revised: 11 October 2019 / Accepted: 15 October 2019 / Published: 17 October 2019
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. View Full-Text
Keywords: hydrodynamic lubrication; tilting-pad journal bearings; cooled pads; CFD analysis; thermal deformation; additive manufacturing; tribology hydrodynamic lubrication; tilting-pad journal bearings; cooled pads; CFD analysis; thermal deformation; additive manufacturing; tribology
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MDPI and ACS Style

Chatterton, S.; Pennacchi, P.; Vania, A.; Dang, P.V. Cooled Pads for Tilting-Pad Journal Bearings. Lubricants 2019, 7, 92.

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