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이성렬(S. L. Lee),김종혁(J. H. Kim),홍예선(Y. S. Hong),김병곤(B. K. Kim),문진삼(J. S. Moon),문준혁(J. H. Moon) 유공압건설기계학회 2015 드라이브·컨트롤 Vol.12 No.2
In order to design a swash plate type pump for electro-hydrostatic actuators the performance of the hydrostatic piston shoe bearings in the low speed range needs to be examined, since the pump operates frequently at low speeds, compensating for position control errors as a control element. As a common practice, piston shoes are equipped with inner rings as an auxiliary element to enhance their tribological performance. In this paper, the effects of the inner rings of the piston shoes on the frictional loss and leakage flow rate were investigated, where three piston shoe models, with different inner ring shapes and different inlet orifice sizes, were integrated. The test results showed that a large inner ring and small inlet orifice were advantageous for reducing both the frictional loss and leakage flow rate; this could also be confirmed by computational analyses.
EHA 펌프용 피스톤 슈 정압베어링의 경계 마찰 성능 개선
홍예선(Y.S. HONG),권용철(Y.C. Kwon),김종혁(C.H. Kim),이성렬(S.L. Lee),김재환(J.H. Kim),김병곤(B.G. Kim),문진삼(J.S. Moon) 유공압건설기계학회 2014 유공압건설기계학회 학술대회논문집 Vol.2014 No.4
The pumps of electro-hydrostatic actuators operate most frequently in boundary lubrication speed range, as they compensate for position control errors as a control element. When conventional swash plate type piston pumps are applied to electro-hydrostatic actuators, the frictional power losses as well as wear rate of sliding components such as piston shoes can increase drastically under the boundary friction condition. In this paper, the power losses of the piston shoes were investigated which were brought about by frictional solid-to-solid contact and leakage flow rate of their hydrostatic bearing. In order to reduce them, DLC-coating was applied to the swash plate and the ball joint of pistons, and its effects was demonstrated. In addition, it was also shown that the wear rate of the piston shoes could be markedly reduced using the DLC-coated swash plate.
EHA 펌프용 피스톤 슈 정압베어링의 경계 마찰 성능 개선
홍예선(Y. S. HONG),권용철(Y. C. Kwon),김종혁(C. H. Kim),이성렬(S. L. LEE),김병곤(B. K. Kim),문진삼(J. S. Moon),김재환(J. H. Kim) 유공압건설기계학회 2014 드라이브·컨트롤 Vol.11 No.2
The pumps of electro-hydrostatic actuators operate most frequently in boundary lubrication speed range, as they compensate for the position control errors as a control element. When conventional swash plate type piston pumps are applied to electro-hydrostatic actuators, the frictional power losses as well as the wear rate of sliding components, such as piston shoes can increase drastically under the boundary friction condition. In this paper, the power losses of the piston shoes were investigated which were engendered by a frictional solid-to-solid contact and leakage flow rate of their hydrostatic bearing. In order to reduce them, DLC-coating was applied to the swash plate and the ball joint of pistons along with its effects were demonstrated. In addition, it was also shown that the wear rate of the piston shoes could be markedly reduced using the DLC-coated swash plate.
DLC 코팅에 의한 사판식 피스톤 펌프의 저속 영역 동력 손실 개선
홍예선(Y. S. Hong),김종혁(J. H. Kim),이성렬(S. L. Lee) 유공압건설기계학회 2014 드라이브·컨트롤 Vol.11 No.4
This paper details application of a DLC(Diamond Like Carbon)-coating to the swash plate and the ball joint of pistons that make sliding contact with the piston shoes of an axial piston pump. This process, aimed to reduce the frictional and leakage power losses of the hydrostatic piston shoe bearings at the low speed range. At lower speeds than 100rpm, the positive effects of the DLC-coating on the power loss reduction of the hydrostatic piston shoe bearings could be confirmed. These effects resulted in little improvement in volumetric efficiency of the test pump, but the mechanical efficiency could be raised by up to 5% at 100rpm; here, the DLC-coated swash plate played a more dominant role than the DLC-coated ball joint.