Experimental and numerical study of the influence of loading direction on the lubrication and cooling of self-circulating oil bearing system applied in internal gear pumps

Mo, Jintao; Gu, Chaohua; Pan, Xiaohong; Zheng, Shilie; Gao, Ying

doi:10.1177/1350650117717597

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…Similar to the previous study, 23 a sensitivity analysis has been done on the oil film force as a function of the number of divisions in the circumferential ( θ ), radial (r) and axial (z) directions with different journal offsets. Results are given in Table 2 with respect to the situation with highest density mesh.…”

Section: Methodsmentioning

confidence: 99%

Experimental and numerical study of the pre-tilted journal bearing

Luo

Jia³

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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Hydrodynamic journal bearings are key components for supporting the rotating shafts in high-speed machinery. The shaft misalignment due to the heavy load, the thermal effects, and the manufacturing errors may introduce problems during running such as rub-impact. So the journal bearing with a pre-tilted angle has been introduced in this paper to solve the problem. The pre-tilted journal bearing is allowed to be adjusted to the proper attitude angle according to the tilt of the shaft under working condition. Thus ensuring the symmetric pressure distribution of the bearing and avoiding the rub-impact. A test rig has been designed and built to validate the working effect of the pre-tilted journal bearing. A design method for the pre-tilted journal bearing has also been introduced in this paper. In this method, a transient coupling model is adopted to precisely calculate the attitude angle of the bearing and a special dynamic mesh method is used to guarantee the mesh quality with arbitrary motion of the journal.

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Section: Methodsmentioning

confidence: 99%

Experimental and numerical study of the pre-tilted journal bearing

Luo

Jia³

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Vane pumps are advantageous owing to features such as small overall dimensions, compact structure, uniform flow, stable operation, low noise, and long service life. They have various applications, such as in machine tools, metallurgy, and injection molding machines [1][2][3][4][5]. There are three friction pairs in a vane pump: the sliding friction of the rotor on the valve plate surface, that of the vane sliding in the radial direction in the vane slot of rotor, and that of the vane top scraping the stator's inner surface in the circumferential direction [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Tribological Behavior of Friction Pairs in a High-Pressure Vane Pump under Variable Working Conditions

Liu

et al. 2021

Tribology Online

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The tribological behavior of the friction pairs in a high-pressure vane pump under variable working conditions was experimentally studied; in particular, the effects of the varying sliding velocity (1.45-3.61 m/s) and contact pressure (0.11-0.44 MPa) on the friction coefficient and wear rate of the friction pairs in pumps with and without vanes in the vane slot of rotor were investigated. In both cases, the friction coefficient increased with increasing sliding velocity and decreased when the increase of contact pressure in two cases when the contact pressure is 0.22 MPa. Further, the wear rate decreased with increasing contact pressure. With increasing velocity, the friction coefficient was more influenced by the vane compared with wear rate. The main tribological mechanism of wear surface of the valve plate is mechanical ploughing. At a sliding velocity of 2.89 m/s, both with and without vanes, increasing the contact pressure resulted in a reduced friction coefficient and enhanced wear rate. When the contact pressure increased, the vane did not significantly influence the friction coefficient and wear rate. During this time, the wear surface morphology of the valve plate exhibited mainly mechanical plowing and adhesion wear marks.

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“…The water film lubrication performance was investigated, and the effects of sinusoidal waves micro-shapes were also studied. The gear pump and journal bearings were also regarded as a system in the research by Mo et al, 30,31 where they proposed the thermohydrodynamic analysis to investigate the lubrication and cooling performance of the self-circulating system. The studies indicated that the increase in the axial clearance leads to a larger leakage and a smaller temperature.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis on the start behavior of rough journal bearings during the gear pump meshing cycle

Zhu

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this paper, the transient lubrication characteristics of hydrodynamic journal bearings during the external gear pump meshing cycle are studied. In the bearings lubrication calculation part, a numerical model is developed to assess the transient lubrication during the initial start-up of an aero gear pump. The model takes into account the effects of surface topography, asperities contact, and pump start-up speed. In the pump simulation part, the flow inside pump and bearing load environment are analyzed by a computational fluid dynamics model. Then a simulation method is presented to solve the problem of pump-bearings system, considering the pump’s influence during bearings lubrication calculation. To gain insight, results of a series of simulations with illustrative examples are presented. The variation of the startup lubrication performance under load conditions corresponding to the pump internal flow field is acquired. The results show that bearings operate from mixed-lubrication to hydrodynamic-lubrication state with changed load-supporting effects during the startup. The load-supporting effects and film rupture boundary are directly related to the pump load fluctuation, but the center trace is slightly influenced except on the hydrodynamic-lubrication state.

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Experimental and numerical study of the influence of loading direction on the lubrication and cooling of self-circulating oil bearing system applied in internal gear pumps

Cited by 6 publications

References 23 publications

Experimental and numerical study of the pre-tilted journal bearing

Experimental and numerical study of the pre-tilted journal bearing

Tribological Behavior of Friction Pairs in a High-Pressure Vane Pump under Variable Working Conditions

Numerical analysis on the start behavior of rough journal bearings during the gear pump meshing cycle

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