Influence of the radial position error of plunger hole on overturning moment of cylinder block

Abstract

Abstract: Taking a certain type of high-speed swash plate axial piston pump as the research object, a model for cylinder overturning moment that incorporates the inertia force caused by the mass of the piston-slipper assembly and the oil within the piston bore, the central spring force, the oil pressure at the bottom of the plunger, and the supporting force of the valve plate oil film were established. Based on the cylinder overturning moment model under the oil film support force, the random error of the radial distribution position of the plunger hole at the rated operating point and the size and variation law of the additional overturning moment of the cylinder under the definite error are calculated and analyzed. The results show that, within the permissible radial position error of ± 0.1 mm, compared with the ideal situation, the maximum moment fluctuation about the x-axis due to inertial forces is 1.16% when the random error is within ±0.1 mm, while the maximum moment fluctuation about both the x-and y-axes due to the supporting reaction force is 0.64%. For a deterministic error of ±0.1 mm, the additional overturning moments around the x and y axes caused by the inertial force is constant, whereas the maximum moment pulsation around caused by the support reaction force is0.05% about the x-axis and 0.45% about the y-axis.

Key words: high speed, swash plate axial piston pump, cylinder overturning moment, radial position error

CLC Number:

TH137

WANG Jian-sen, HUANG Wei, LI Wen-xuan, LEI Zhen-yu, TIAN Shi-rong. Influence of the radial position error of plunger hole on overturning moment of cylinder block[J]. Journal of Lanzhou University of Technology, 2025, 51(1): 34-44.

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