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Development of a hydrodynamic bearing test bench for combined radial and axial loads
The present work focuses on the test method for the investigation of combined journal-thrust bearings. In simple applications, radial or thrust bearings are separated physically and can be considered as stand-alone machine elements. These can each be dimensioned by established calculation models. In compact designs, combined bearings must be used due to space savings. In this case, the bearing parts are present as a unit in which the axial part is supplied with lubricant from the radial part. If the bearing parts are treated separately, the oil outlet temperature of the radial part can serve as the input variable for the axial part. In this case, both the coupled thermal conduction between the running surfaces through the material and the pressure interaction between the two bearing parts are neglected. The thermal coupling of the bearing parts leads to an overall higher thermal load. The pressure interaction affects the respective volume flow, which also has a significant influence on the respective bearing temperatures. The development and validation of a simulation program required accompanying extensive measurements on the real bearing. For this purpose, the development of a suitable test bench for applying a combined radial and axial load is to be presented in this paper. In addition, the measurement procedures will be discussed, such as the determination of pressure and temperature in the bearing surfaces and the transition areas between journal and thrust bearing parts. Finally, the temperature distribution between a pure radial load on a journal bearing and a combined load on the identical journal-thrust bearing will be compared using the example of an operating point.
Development of a hydrodynamic bearing test bench for combined radial and axial loads
The present work focuses on the test method for the investigation of combined journal-thrust bearings. In simple applications, radial or thrust bearings are separated physically and can be considered as stand-alone machine elements. These can each be dimensioned by established calculation models. In compact designs, combined bearings must be used due to space savings. In this case, the bearing parts are present as a unit in which the axial part is supplied with lubricant from the radial part. If the bearing parts are treated separately, the oil outlet temperature of the radial part can serve as the input variable for the axial part. In this case, both the coupled thermal conduction between the running surfaces through the material and the pressure interaction between the two bearing parts are neglected. The thermal coupling of the bearing parts leads to an overall higher thermal load. The pressure interaction affects the respective volume flow, which also has a significant influence on the respective bearing temperatures. The development and validation of a simulation program required accompanying extensive measurements on the real bearing. For this purpose, the development of a suitable test bench for applying a combined radial and axial load is to be presented in this paper. In addition, the measurement procedures will be discussed, such as the determination of pressure and temperature in the bearing surfaces and the transition areas between journal and thrust bearing parts. Finally, the temperature distribution between a pure radial load on a journal bearing and a combined load on the identical journal-thrust bearing will be compared using the example of an operating point.
Development of a hydrodynamic bearing test bench for combined radial and axial loads
Friedrich, Lars (author) / Prase, Björn (author) / Ebermann, Marko (author) / Hasse, Alexander (author) / Technische Universität Chemnitz
2024-11-14
Conference paper
Electronic Resource
English
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