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Abstract

Tribological characteristics in the sliding parts of oil hydraulic piston pumps are very important in increasing overall efficiency. In this study, the fluid film between the valve plate and the cylinder block was measured by using a gap sensor and the mercury-cell slip ring unit under real working conditions. To investigate the effect of the valve shape, we designed three valve plates each having a different shape. One of the valve plates was without bearing pad, another valve plate had bearing pad and the last valve plate was a spherical valve plate. It was noted that these three valve plates observed different aspects of the fluid film characteristics between the cylinder block and the valve plate. The leakage flow rates and the shaft torque were also investigated in order to clarify the performance difference between these three types of valve plates. From the results of this study, we found that the spherical valve plate estimated good fluid film patterns and good performance more than the other valve plates in oil hydraulic axial piston pumps.

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참고문헌 (8)

  1. Franco, N., 1961, 'Pump Design by Force Balance,' Hydraulics & Pneumatics, Vo. 14, No. 11, pp. 101-107 
  2. Hibbert, G., Lindsay, D. V., Shute, N. A. and Turnbull, D. E., 1971, 'The Balancing of Piston and Valve Plate Forces in Axial-Piston Pumps and Motors,' BHRA, Paper G2, pp. 13-40 
  3. Jae-Youn Jung, Jong-Ki Kim, 2003, 'Measurement of Fluid Film Thickness on the Valve Plate in Oil Hydraulic Axial Piston Pumps (Part I: Bearing Pad Effects),' KSME International Journal, Vol. 17, No. 2, pp. 246-253 
  4. Jong-Ki Kim, Hyoung-Eui Kim, Jae-Youn Jung, Seok-Hyung Oh and Seok-Hoon Jung 2004, 'Relation Between Pressure Variations and Noise in Axial Type Oil Piston Pumps,' KSME International Journal, Vol. 18, No. 6, pp. 1019-1025 
  5. McKeown, J., Milner, D. A., Shute, N. A. and Turnbull, D. E., 1966, 'Hydrodynamic Factors Affecting the Design of Valve Plates and Thrust Bearings,' Proc. I. Mech. E., Vol. 181, No. 1, pp. 653-665 
  6. Saitchenko, J. S., 1950, 'Force Balance Conditions of the Valve Plate and Rotor of an Axial Piston Pump,' Stanki. I. Instrument, 10, pp. 28-29. BHRA T 750 
  7. Shute, N. A. and Turnbull, D. E., 1964, 'The Hydrostatic Pressure Distribution Across the Lands of a Valve Plate of an Axial Piston Machine, Part I: No Heat Loss,' BHRA Rept RR 795 
  8. Taylor, R. and Lin, L., 1984, 'The Application of Tribological Principles to the Design of the Valve Plate of an Axial Piston Pump, Part I,' The BFPR Journal, Vol. 17. No. 2, pp. 257-262 

이 논문을 인용한 문헌 (1)

  1. 2006. "" Journal of mechanical science and technology, 20(10): 1590~1606 

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