Research on the Cylinder Block/Valve Plate Interface Performance in Ultra-high-pressure and High-speed Swash Plate Type Variable Displacement Axial Piston Machines

doi:10.3901/JME.2025.02.358

Abstract

Abstract: Ultra-high working pressure is the inevitable development trend and requirement of hydraulic technology. However, the ultra-high working pressure increases the overturning moment of the cylinder block of the axial piston pump, aggravates the overturn of the cylinder block, and is more likely to cause eccentric wear failure and leakage in the cylinder block/valve plate interface. It puts forward the higher requirements for the friction, lubrication and sealing, load-carrying performance of the cylinder block/valve plate pair. Therefore, A numerical analytical model is established, which is coupled with the mapping relationship between the structure parameters, operating parameters, oil performance parameters, etc., and the friction, lubrication as well as sealing, load-carrying properties of the cylinder block/valve plate pair oil film. Based on this model, a cylinder block/valve plate pair with a plane auxiliary support structure adapted to the ultra-high pressure 63 MPa working condition is designed through numerical analysis. It is founded that the support structure can make the oil film of the cylinder block in contact with the valve plate due to inclination of cylinder block to generate additional bearing capacity, thus further balancing the load overturning moment on the cylinder block and enhancing the anti-overturning ability of the oil film of the cylinder block/valve plate pair. The cylinder block/valve plate pair is applied to the first domestically developed ultra-high-pressure high-speed swash plate type variable displacement axial piston conjoined pump motor physical prototype with a nominal pressure of 63MPa, and the good working performance of the cylinder block/valve plate pair is verified through experimental tests. The research results can provide advanced design methods and guidance for the research and development of the high-performance cylinder block/valve plate pair.

Key words: axial piston pump, axial piston motor, ultra-high pressure, auxiliary support, cylinder block/valve plate pair, oil film

CLC Number:

TH137

HU Min, QIU Tianxiang, WU Zhe, LIU Rui, ZENG Yishan, LIU Changhai. Research on the Cylinder Block/Valve Plate Interface Performance in Ultra-high-pressure and High-speed Swash Plate Type Variable Displacement Axial Piston Machines[J]. Journal of Mechanical Engineering, 2025, 61(2): 358-370.

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