Relative motion relation in the external return spherical bearing pair of a balanced double-row axial piston pump

Abstract

Based on the external compaction return mechanism of a balanced double-row axial piston pump and the vector coordinate transformation principle, a mathematical model of the relative motion relation within the external return spherical bearing pair was built. The influence of slant inclination of the external swash plate and of pump shaft rotating speed and eccentricity on the relative motion trail, movement speed and acceleration was analysed. The relative motion velocity and acceleration between external retainer plate and external spherical hinge, at top and bottom dead centres, were discussed. By increasing the slant inclination of the external swash plate, the relative motion trail increased correspondingly, leading to a larger size of the pump integral structure. The relative speed and acceleration increased with the pump shaft speed and the slant inclination of the external swash plate, leading to a larger fluctuation of the slipper pair oil film. The increase of eccentricity slightly influenced the relative velocity and acceleration along the x-axis, without significantly increasing the fluctuation of the slipper pair oil film. Increasing the pump shaft speed, the external swash plate slant inclination and the eccentricity all caused fluctuations in the relative velocity and acceleration along the y- and z-axes, deepening the grinding crack on the compaction surface of the external retainer plate. In case of eccentricity and a 0° rotation angle of the principal axis, the related acceleration of the radial friction surface of the retainer plate showed the largest fluctuation amplitude, and a scratch could easily occur.

Keywords

Axial piston pump mathematical model return mechanism relative motion scratch

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References

Richardson

Sadeghi

Rateick

et al.

Dynamic modeling of floating valve plate motion in an axial piston pump. Tribol Trans 2018; 61: 683–693.

Schuhler

Jourani

Bouvier

et al.

Efficacy of coatings and thermochemical treatments to improve wear resistance of axial piston pumps. Tribol Int 2018; 126: 376–385.

Yin

Nie

Hou

et al.

Effect analysis of silencing grooves on pressure and vibration characteristics of seawater axial piston pump. Proc IMechE, Part C: J Mechanical Engineering Science 2017; 231: 1390–1409.

Zhang

Chao

Wang

et al.

Experimental investigations of the slipper spin in an axial piston pump. Measurement 2017; 102: 112–120.

Chao

Zhang

et al.

Discussion on the Reynolds equation for the slipper bearing modeling in axial piston pumps. Tribol Int 2018; 118: 140–147.

Pelosi

Ivantysynova

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

Kumar

Bergada

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

Sun

. Fracture mechanism analysis on the slipper retainer in axial piston pumps. Eng Fail Anal 2017; 80: 378–385.

Manring

. The relative motion between the ball guide and slipper retainer within an axial-piston swashplate type hydrostatic pump. ASME J Dyn Syst Meas Control 1999; 121: 518–523.

10.

. Research on the relative motion between the ball guider and retainer within axial piston pump based on virtual prototype. Mach Tool Hydraul 2010; 38: 18–21.

11.

Li CG. Virtual prototype modeling and simulation platform research of axial piston pump. Master Thesis, Zhejiang University, China, 2010.

12.

Zhang

et al.

Distribution characteristics and impact on pump's efficiency of hydro-mechanical losses of axial piston pump over wide operating ranges. J Central South Univ 2017; 24: 609–624.

13.

Hu M. Study on power losses and design technology for the surface topography of friction pairs of axial piston pump. PhD Thesis, Zhejiang University, China, 2017.

14.

Sun

Jiang

. Stress analysis and experiments for slipper retainer and ball guide in axial piston pump. J Xian Jiaotong Univ 2013; 47: 103–108.

15.

Sun

Jiang

Liu

. Relative position and friction power loss between slipper retainer and ball guide in axial piston pump. J South China Univ Technol 2011; 39: 82–87.

16.

Deng HS, Huang R and Wang CL. A swash-plate axial piston pump/motor compacting device. Patent No. CN104863813A, China, 26 Aug 2015.

17.

Deng

Wang

Zhang

. Study on flow ripple of balanced two-ring axial piston pump. Trans Chinese Soc Agric Mach 2014; 45: 305–309.

18.

Deng

Huang

Wang

et al.

Overturning moment of cylinder of balanced two-ring axial piston pump. J Jilin Univ (Eng Technol Ed) 2015; 45: 1468–1480.

19.

Pelosi

Ivantysynova

. The impact of axial piston machines mechanical parts constraint conditions on the thermo-elastohydrodynamic lubrication analysis of the fluid film interfaces. Int J Fluid Power 2013; 14: 35–51.

20.

Liu

Peng

et al.

Effects of hold down device on the slipper's dynamic characteristics. Trans Beijing Inst Technol 2017; 37: 233–238.

21.

Nie

Huang

. Tribological study on hydrostatic slipper bearing with annular orifice damper for water hydraulic axial piston motor. Tribol Int 2006; 39: 1342–1354.

22.

Canbulut

Koc

Sinanoglu

. Design of artificial neural networks for slipper analysis of axial piston pumps. Ind Lubr Tribol 2009; 61: 67–77.

23.

Manring

. Friction forces within the cylinder bores of swash-plate type axial-piston pumps and motors. ASME J Dyn Syst Meas Control 1999; 121: 531–537.

24.

Bergada

Watton

Kumar

. Pressure, flow, force, and torque between the barrel and port plate in an axial piston pump. ASME J Dyn Syst Meas Control 2008; 130: 011011.

25.

Han

Wang

Zhang

. A partial lubrication model between valve plate and cylinder block in axial piston pumps. Proc IMechE, Part C: J Mechanical Engineering Science 2015; 229: 3201–3217.