Experiment on Mixed Lubrication of Hydrostatic Thrust Bearings for Hydraulic Equipment

Kazama, Toshiharu; Yamaguchi, Atsushi

doi:10.1115/1.2831265

Cited by 30 publications

(18 citation statements)

References 7 publications

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“…In particular, they studied a flat oillubricated metallic slipper bearing. Mixed lubrication characteristics of hydrostatic thrust bearings were examined experimentally in another research of the same author (Kazama and Yamaguchi 1995). A significant agreement exists between the experimental outputs and the theoretical results from a mixed lubrication model proposed.…”

Section: Introductionmentioning

confidence: 65%

Axial piston pumps slippers with nanocoated surfaces to reduce friction

Rizzo

Massarotti

Bonanno

et al. 2015

International Journal of Fluid Power

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This paper shows the experimental results obtained using a nanocoating (developed by ISTEC-C.N.R.) applied to the slippers of an axial piston pump to reduce the friction losses in order to improve the pump overall efficiency map. It is well known that the mechanical power losses in a hydraulic pump come from the friction between parts in relative motion. The need to provide, especially at low rotational speed, hydrodynamic lift causes power losses in terms of volumetric and mechanical efficiency, due to the contrasting need to increase leakage to provide lubrication and to keep a minimum clearance in meatus to limit the volumetric losses. The application of special surface treatments have been exploited in pioneering works in the past, trying different surface finishing or adding ceramic or heterogeneous metallic layers, but the potential of structured coatings at nanoscale, with superhydrophobic and oleophobic characteristics, has never been exploited. Using a dedicated test rig developed at IMAMOTER-C.N.R., able to ensure hydrostatic working condition during the mutual rotation between the slippers and the swash plate, the functional performance of the nanocoated slippers' surface have been studied. In the first part of the paper, the functionalization method is presented; in the second part, a comparison between the experimental performances of coated and uncoated surfaces is showed.

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Section: Introductionmentioning

confidence: 65%

Axial piston pumps slippers with nanocoated surfaces to reduce friction

Rizzo

Massarotti

Bonanno

et al. 2015

International Journal of Fluid Power

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“…Notation a pi acceleration of piston (m/s 2 ) A flow opening area of piston chamber to the discharge or inlet kidney port (m 2 ) A pg area of piston port on the bottom of cylinder block (m 2 ) A z cross-sectional area of piston chamber (m 2 ) A 0 overlap area between discharge silencing groove and top transitional piston port (m 2 ) pressure distribution of inner seal land of discharge kidney port (Pa) P 21 pressure distribution of outer seal land of discharge kidney port (Pa) P 12 pressure distribution of inner seal land of discharge silencing groove (Pa) P 22 pressure distribution of outer seal land of discharge silencing groove (Pa) r 11 average radius of inner seal land of discharge kidney port (m) r 21 average radius of outer seal land of discharge kidney port (m) r 12 average radius of inner seal land of discharge silencing groove (m)…”

Section: Declaration Of Conflicting Interestsmentioning

confidence: 99%

A new dynamic seven-stage model for thickness prediction of the film between valve plate and cylinder block in axial piston pumps

Zhang

Huang

et al. 2016

Advances in Mechanical Engineering

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Axial piston pumps are very important to the hydraulic system on aircrafts, and their reliability plays critical role for ensuring the reliability and safety of aircrafts. The thickness prediction of the film between valve plate and cylinder block has received considerable concerns. This article presents a new dynamic seven-stage model for the thickness prediction of the film between valve plate and cylinder block in axial piston pumps. By dividing the rotation of the cylinder into seven stages, the complete analytical expression of the pressure distributions between valve plate and cylinder block is derived. The lubrication film forces and torques exerted on the cylinder block are then calculated and the film is determined by analyzing the complex dynamics of cylinder block. Experiments have been conducted and the results show that the proposed model is effective.

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“…WANG [4][5] studied the influence of oil film, the flow rate to the stiffness of the hydrostatic thrust bearing by theory and experiment. KAZAMA [6][7] proposed an optimum design method for the elastic deformation of the oil lubricated nonmetallic bearing. Experimental study has proved that the change of hydraulic pressure can cause the elastic deformation of the structure by PANG [8].…”

Section: Introductionmentioning

confidence: 99%

Loading Capacity Analysis of Hydrostatic Oil Pad Based on Fluid-structure Coupling

Zhao¹,

Zhang²,

Yu³

2016

Proceedings of the 2016 International Conference on Mechatronics Engineering and Information Technology

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Abstract. Hydrostatic guideway is the key component of heavy-duty CNC machine tool feed system. The working performance of the hydrostatic guideway have great influence to the accuracy of machine tool. In order to analysis the performance of the oil pad, a calculation method based on Reynolds equation and the thin plate deformation equation, considering the fluid-structure coupling, is established. The influence of film thickness, oil supply parameter and inclination to the performance of the oil pad are discussed. It is shows that loading capacity declined compared with the situation which is not considering the fluid-structure coupling.

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Experiment on Mixed Lubrication of Hydrostatic Thrust Bearings for Hydraulic Equipment

Cited by 30 publications

References 7 publications

Axial piston pumps slippers with nanocoated surfaces to reduce friction

Axial piston pumps slippers with nanocoated surfaces to reduce friction

A new dynamic seven-stage model for thickness prediction of the film between valve plate and cylinder block in axial piston pumps

Loading Capacity Analysis of Hydrostatic Oil Pad Based on Fluid-structure Coupling

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