Lubrication characteristics of ball–cylinder pair in eccentric ball piston pumps

Zhao, Hongmei; Wei, Chao; Jing, Chenchen; Lin, Shuo

doi:10.1177/1350650115610356

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Q le is the external leakage from the gap seal at the ball piston-cylinder interface. In equation (11),…”

Section: Flow Rate Characteristicsmentioning

confidence: 99%

“…Gao et al 10 deduced the relationship between the number of ball pistons and pump flow pulsation based on the structure of eccentric ball piston pump, and analyzed the influence of ball piston number on outlet flow fluctuation and noise when the eccentricity is a constant. Zhao et al 11 studied the lubrication characteristics of the ball-cylinder pair in eccentric ball piston pump, and the modified point contact elasto-hydrodynamic lubrication (EHL) model of the ball-cylinder pair was developed. The friction and lubrication characteristics of the ball-cylinder pair are calculated and analyzed, and some experimental verification was given out.…”

Section: Introductionmentioning

confidence: 99%

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Optimization study of low lateral force in eccentric ball-piston pumps

Wu,

Ma,

et al. 2024

Advances in Mechanical Engineering

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Eccentric ball piston pump is a high power density hydraulic component. In this paper, a low lateral force design method for an eccentric ball-piston pump is proposed to reduce the lateral force between the ball and the cylinder by slightly inclination of the cylinder, and a mathematical model of the method is established. An experimental platform of eccentric ball-piston pump for evaluating the performance of cylinder block slightly inclination was established to verify the effect of slightly inclined cylinder block on the volumetric efficiency and mechanical efficiency of the pump. According to the experimental results of the prototype, the tilting angle from 0° to 3°, the lateral force between the ball piston and the cylinder decreases and then increases, the volumetric efficiency of the pump increases and then decreases, and the mechanical efficiency improves continuously. 3° of cylinder tilting angle reduces the friction torque by 2.63 Nm compared with the un-tilted cylinder, and the mechanical efficiency improves by 7.12%. 2° of cylinder tilting angle reduces the leakage volume by 0.475 L/min compared with the un-tilted cylinder, and the volumetric efficiency improves by 3.67%. This study is instructive for the study of high efficiency of eccentric ball piston pumps.

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“…Q le is the external leakage from the gap seal at the ball piston-cylinder interface. In equation (11),…”

Section: Flow Rate Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization study of low lateral force in eccentric ball-piston pumps

Wu,

Ma,

et al. 2024

Advances in Mechanical Engineering

View full text Add to dashboard Cite

show abstract

Design of cascade P-P-FOPID controller based on marine predators algorithm for load frequency control of electric power systems

Hussain,

Zou,

Akhtar

et al. 2024

Electr Eng

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A Study on Force and Lubrication Characteristics of Ball Piston in Eccentric Ball Piston Pump

Wei

Jing

et al. 2017

Journal of Tribology

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Ball piston is an essential design element in eccentric ball piston pump. The objective of this paper is to investigate the dynamic force and lubrication characteristics of the ball piston. In this study, a tribodynamic model of the ball piston is proposed. The model couples the elastohydrodynamic lubrication model of ball–ring pair and the elastohydrodynamic model of ball–cylinder pair with the dynamic model of the ball piston. The interaction between tribological behavior and dynamic performance and the effects of centrifugation and structural deformation of the ball piston are considered. The pressure distributions and film profiles of the ball–ring pair and ball–cylinder pair are calculated. The dynamic normal contact forces and friction forces are analyzed. The friction torque loss and mechanical efficiency of the whole pump are obtained by combing the tribodynamic model of the ball piston with a simplified friction torque model of cylinder-valve shaft pair. A test bench is established for validating the simulation results. The results show that the normal contact force of the ball–ring pair waves in each stroke, and in discharge stroke, the contact force is much bigger than that in suction stoke because of loading force, while the friction force changes very little for the ball sliding in the outer ring. Comparing with the average friction force of the ball–ring pair, the average friction force of the ball–cylinder pair is small, which reflects that the ball–ring pair is more prone to wear. For the ball–ring friction pair, when the load increases, the secondary contact pressure peak appears, the profile of film presents a horseshoe shape, and the classical shrinkage appears at the outlet of contact region. For the ball–cylinder pair, the film pits and the contact pressure jumps at the entrance of contact region for the heavy load and the high shear stain of film. In addition, the friction torque presents a nonlinear growth trend with the increasing working pressure

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Lubrication characteristics of ball–cylinder pair in eccentric ball piston pumps

Cited by 3 publications

References 7 publications

Optimization study of low lateral force in eccentric ball-piston pumps

Optimization study of low lateral force in eccentric ball-piston pumps

Design of cascade P-P-FOPID controller based on marine predators algorithm for load frequency control of electric power systems

A Study on Force and Lubrication Characteristics of Ball Piston in Eccentric Ball Piston Pump

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