Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Analysis of Performance Characteristics of Swash-Plate-Type Hydraulic Piston Motor

사판식 유압 피스톤모터의 성능특성 분석

  • Received : 2012.05.02
  • Accepted : 2012.09.12
  • Published : 2012.11.01
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Abstract

An axial-piston-type hydraulic motor involves friction and leakage losses at the sliding parts, contact loss at the mechanism assembly parts, volumetric loss caused by the pressure drop, housing oil churning loss and compressibility from the hydraulic oil pipe resistance, etc. the friction and volumetric loss at the hydrostatic bearing between the piston shoe and the swash plate rotating at high speed and having an oil film gap of 8-15 ${\mu}m$ strongly affects the total efficiency of the hydraulic motor. In this study, a variable swash-plate-type hydraulic piston motor operating under a maximum pressure of 35 MPa, maximum speed of 2,500 rpm, and displacement of 320 cc/rev is tested to verify the optimal ratio of the hydrostatic bearing which is closely related to the hydraulic motor performance.

유압피스톤모터는 정압베어링부분의 마찰손실과 용적손실, 기구적 운동부분의 마찰손실, 오일의 관로저항에 의한 압력저하, 압축성에 의한 체적손실 그리고 하우징 오일 처닝(churning) 손실 등이 있다. 이러한 손실 중에서 일정한 틈새의 유막(oil film, $8{\sim}15{\mu}m$)으로 고속 회전하는 피스톤 슈(piston shoe)와 슈 플레이트(shoe plate) 사이 정압베어링 부분의 마찰 및 용적손실이 유압모터의 전체효율을 좌우 한다. 본 연구에서는 최고압력 35MPa, 최고회전수 2500rpm, 배재용적 320cc/rev급 2속(2-speed) 초대형 굴삭기의 주행모터용 유압피스톤모터를 대상으로 정압베어링비가 유압모터의 전 효율에 미치는 영향을 실험적으로 분석하였다.

Keywords

References

  1. Lee, Y. B., 2002, "A Study of Efficiency Characteristic of Hydraulic Piston Pump with Variable Hydrostatic Bearing Ratio," Hanbat National Univ., pp. 9-17.
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  3. Lee, J. O. and Park, T. J., 1994, "Effect of Piston Shape on the Lubrication Characteristics of Hydraulic Piston Pump and Motor," Trans. of KSTLE, Vol. 10, No. 3, pp. 47-53.
  4. Ham, Y. B., Yoon, S. N., Kim, D. S., Choi, B. O. and Kim, S. D., 2001. "Dynamic Response Characteristics Evaluation of Hydrostatic Bearing in Hydraulic Piston Pump/Motor," Conf. of the KSME(B), pp. 116-120.
  5. Jung, J. Y., Cho, I. S., Baek, I. H., Song, K. K., Oh, S. H. and Jung, S. H., 2007, "A Study on Lubrication Characteristic of Slipper Hydrostatic Bearing in Hydraulic Piston Pump," Trans. of the KFPS, Vol. 4 No. 3, pp. 1-6.
  6. Lee, Y. B. and Kim, K. M., 2011, "A Study on Lubrication Characteristic of the Hydrostatic Bearing in Swash Plate Type Piston Motor," Trans. of KSPSE, Vol. 15, No. 5, pp. 5-9.

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