Experimental Study of the Shaft Motion in the Journal Bearing of a Gear Pump

Castilla, R.; Gutes, M.; Gamez-Montero, Pedro Javier; Codina, Esteban

doi:10.1115/1.3078202

Cited by 10 publications

(5 citation statements)

References 8 publications

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“…Mucchi et al 21 investigated the dynamic behaviour of the gear shaft for optimizing the pump's running-in process. Castilla et al 22,23 studied the gear shaft's radial micro-motion, focusing on the working conditions where oil film rupture occurred. Vacca and Guidetti 24 and Pellegri and Vacca 25 developed a simulation tool, HYGESim (HYdraulic GEar machines Simulator), which enabled accurate estimation of the gear shaft's radial micro-motion.…”

Section: And Pellegri and Vaccamentioning

confidence: 99%

Numerical analysis of the lubricating gap between the gear shaft and the journal bearing in water hydraulic internal gear pumps

Chen

Zhou

2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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Water hydraulics has drawn considerable attention in recent years for its environmental friendliness. This paper presents a numerical model for analysing the lubricating gap between the gear shaft and the journal bearing in water hydraulic internal gear pumps. The model consists of two parts: the gear part that addresses the radial force on the gear shaft and the film part that addresses the film characteristics of the gear shaft/journal bearing interface. The radial force is obtained by summing the fluid pressure around the gear circumference and the meshing force of the gear pair. The film characteristics are analysed by an elastohydrodynamic model that involves the evaluation of the film geometry, the film pressure, and the elastic deformation of the gear shaft/journal bearing interface. The radial force evaluated by the gear part is balanced by the film pressure evaluated by the film part. The gear part is validated by experiments on an oil internal gear pump from the aspect of the outlet pressure ripple, and the film part is validated by comparison with the results from other research groups. The proposed model allows the evaluation of radial micro-motion as well as the eccentric positions of the gear shaft. In addition, the influence of film deformation is further discussed, suggesting that the maximum film deformation should be maintained under 1.3 times the minimum film height. The proposed model can be used as a tool for design optimization of the water-lubricated journal bearing in water hydraulic internal gear pumps.

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Section: And Pellegri and Vaccamentioning

confidence: 99%

Numerical analysis of the lubricating gap between the gear shaft and the journal bearing in water hydraulic internal gear pumps

Chen

Zhou

2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Based on the expertise of our laboratory, laser transducers are used to measure hydrodynamic film clearances by inserting small rods into the shaft and bearing bushing. This method, developed by Gutés [10] and Castilla et al [11] to realise the journal bearing clearances, has been adapted to measure the lateral gap between the FBB and the gears, described in Torrent's Ph.D. Thesis [12] and in the article by Torrent et al [3].…”

Section: Introductionmentioning

confidence: 99%

Motion Modelling of the Floating Bushing in an External Gear Pump Using Dimensional Analysis

Torrent,

Gamez-Montero,

Codina

2023

Actuators

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A new approach to model the motion of floating bushings in external gear pumps is presented in this article, where lubrication conditions have been introduced using dimensional analysis. This model is based on Bond Graph diagrams and has been experimentally validated in lab tests measuring the movement of the floating bushing inside the gear pump by means of laser micrometers. The novelty of this research is the creation of a simple and experimentally validated tool for the behaviour study of these types of pumps, which allows the simulation of a dynamic rigid solid in a fluid boundary with clearances of the order of microns, without using powerful CFD tools, with very short execution times, and using conventional computational tools. The qualitative behaviour of the model with respect to the experimental results is very similar, adjusting the numerical values with very acceptable accuracies by taking into account the precision of the experimental measurements, and allows us to use the model to interpret the volumetric and mechanical efficiency variations according the operating conditions.

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“…In the Fluid Mechanics Laboratory-UPC, laser transducers are used to measure hydrodynamic film clearances, inserting small rods in the shaft and the bearing bushing. This method, developed by Gutés [25] and Castilla et al [26] for the measurement of journal bearing clearances, was adapted for lateral gap measurement.…”

Section: Introductionmentioning

confidence: 99%

Model of the Floating Bearing Bushing Movement in an External Gear Pump and the Relation to Its Parameterization

2021

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This article presents the modeling, simulation and experimental validation of the movement of the floating bearing bushing in an external gear pump. As a starting point, a complete pump parameterization was carried out through standard tests, and these parameters were used in a first bond graph model in order to simulate the gear pump behavior. This model was experimentally validated under working conditions in field tests. Then, a sophisticated bond graph model of the movement of the floating bushing was developed from the equations that define its lubrication. Finally, as a result, both models were merged by integrating the dynamics of the floating bushing bearing with the variation of the characteristic parameters (loss coefficients). Finally, the final model was experimentally validated both in laboratory and field tests by assembling the pump in a drilling machine to drive the auxiliary movements. The novelty of this article is the conception and construction of a simple and experimentally validated tool for the study of a gear pump, which relates its macroscopic behavior as a black box (defined by the loss coefficients) to the internal changes of the unit (defined by its internal lubrication).

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Experimental Study of the Shaft Motion in the Journal Bearing of a Gear Pump

Cited by 10 publications

References 8 publications

Numerical analysis of the lubricating gap between the gear shaft and the journal bearing in water hydraulic internal gear pumps

Numerical analysis of the lubricating gap between the gear shaft and the journal bearing in water hydraulic internal gear pumps

Motion Modelling of the Floating Bushing in an External Gear Pump Using Dimensional Analysis

Model of the Floating Bearing Bushing Movement in an External Gear Pump and the Relation to Its Parameterization

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