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홍예선(Yeh-Sun Hong),도윤호(Yoon-Ho Doh) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The design of a high speed axial piston pump for hydrostatic transmission systems requires specific understanding<br/> on where and how much its internal frictional and flow losses are generated. In this study, the frictional loss of a bentaxis<br/> type hydraulic piston pump was analyzed in order to find out which design factors influence the mechanical<br/> efficiency most significantly. To this end, the friction coefficients of the sliding components were experimentally<br/> identified by a specially constructed tribometer. Applying them to the three-dimensional dynamic model of the pump<br/> presented by Doh and Hong [1], the friction torques generated by the sliding components such as piston head , bearing<br/> and valve plate were theoretically computed. The accuracy of the computed results was confirmed by the comparison<br/> with the experimentally measured mechanical efficiency. In this paper, it is shown that the viscous friction on the valve<br/> plate and the drive shaft bearing is the primary sources of the frictional losses of the bent-axis type pump, while the<br/> friction forces on the piston contribute to them only slightly.