Prediction on the lubrication and leakage performance of the piston–cylinder interface for axial piston pumps

Abstract

Hydraulic piston pump has the advantages of high efficiency and low-pressure pulsation and has been widely used in the field of construction and agriculture machinery. However, the oil leakage problem, especially the internal leakage of the piston, seriously affects the efficiency of the pump and causes unstable state and high noise. First of all, to improve the performance of the hydraulic pump, a nonlinear mathematical model of the Reynolds equation and energy equation was established to predict the oil film thickness and pressure distribution. What's more, the influence of multiple parameters such as pressure, temperature, swash plate angle, leakage clearance, and the length of leakage flow path on the internal leakage of the piston–cylinder interface was explored. Last but not the least, a test rig was built to measure the corresponding values and to evaluate the effectiveness of the mathematic model. Simulations and experiments consider the variables such as pressure, temperature, and swash plate angle. Both results show that the nonlinear mathematical model could predict the piston pair leakage accurately, so it could be an effective way to improve the design of the piston–cylinder surface structure, gaining higher efficiency.

Keywords

Film thickness pressure field hydraulic axial piston pump leakage prediction lubrication

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References

Gels

Murrenhoff

. Simulation of the lubricating film between contoured piston and cylinder. Int J Fluid Power 2010; 11: 15–24.

Bergada

Kumar

Davies

, et al. A complete analysis of axial piston pump leakage and output flow ripples. Appl Math Model 2012; 36: 1731–1751.

Bergada

Davies

Kumar

, et al. The effect of oil pressure and temperature on barrel film thickness and barrel dynamics of an axial piston pump. Meccanica 2012; 47: 639–654.

Pelosi

Ivantysynova

. A geometric multigrid solver for the piston–cylinder interface of axial piston machines. Tribol Trans 2012; 55: 163–174.

Pelosi

Ivantysynova

. Heat transfer and thermal elastic deformation analysis on the piston/cylinder interface of axial piston machines. J Tribol 2012; 134: 041101.

Zhang

Yang

, et al. Investigation on the radial micro-motion about piston of axial piston pump. Chinese J Mech Eng 2013; 26: 325–333.

Zhang

. Impact of typical steady-state conditions and transient conditions on flow ripple and its test accuracy for axial piston pump. Chinese J Mech Eng 2015; 28: 1012–1022.

Usman

Cheema

Park

. Tribological performance evaluation and sensitivity analysis of piston ring lubricating film with deformed cylinder liner. ARCH Proc IMechE, Part J: J Engineering Tribology 1994-1996 (vols 208-210) 2015, pp. 229.

Usman

Park

. Numerical investigation of tribological performance in mixed lubrication of textured piston ring-liner conjunction with a non-circular cylinder bore. Tribol Int 2017; 105: 148–157.

10.

Zawistowski

Kleiber

. Gap flow simulation methods in high pressure variable displacement axial piston pumps. Arch Comput Methods Eng 2017; 24: 519–542.

11.

Kumar

Bergada

. The effect of piston grooves performance in an axial piston pumps via CFD analysis. Int J Mech Sci 2013; 66: 168–179.

12.

Choudhuri

Chakraborty

Chakraborti

, et al. Stress analysis and design optimization of piston slipper assembly in an axial piston pump. J Scient Ind Res 2014; 73: 318–323.

13.

Qian

Liao

. Nonisothermal fluid-structure interaction analysis on the piston/cylinder interface leakage of high-pressure fuel pump. J Tribol 2014; 136: 021704.

14.

Qian

Liao

Xiang

, et al. Thermal fluid-structure interaction analysis on the piston/cylinder interface leakage of a high-pressure fuel pump for diesel engines. ARCH Proc IMechE, Part J: J Engineering Tribology 1994-1996 (vols 208-210) 2016, pp. 231.

15.

Kamaraj

Subramanian

Rakkiappan

. Numerical and experimental analysis of fluid-fluid interaction and flow through micro clearance to estimate leakages in a fuel injection pump. ARCH Proc IMechE, Part C: J Mechanical Engineering Science 1989-1996 (vols 203-210) 2016; 54: 495–515.

16.

Mills

Avan

Dwyer-Joyce

. Piezoelectric sensors to monitor lubricant film thickness at piston–cylinder contacts in a fired engine. Proc IMechE, Part J: J Engineering Tribology 2013; 227: 100–111.

17.

Mills

Dwyer-Joyce

. Ultrasound for the non-invasive measurement of IC engine piston skirt lubricant films. ARCH Proc IMechE, Part J: J Engineering Tribology 1994-1996 (vols 208-210) 2015; 228: 1330–1340.