• 제목/요약/키워드: 정압 베어링 장치

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정압 베어링을 채택한 미세 스탬핑 장치의 설계 (Design of a high precision press with hydrostatic bearings)

  • 전상열;변재호;함주희;현소영;김권희
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2000년도 추계학술대회논문집A
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    • pp.712-717
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    • 2000
  • Hydrostatic bearings have been applied to high precision machine tools and instruments, because the bearing has high stiffness, high damping and excellent straightness. This paper treats a procedure for designing a high precision press with linear hydrostatic bearings.

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경사조건을 고려한 대용량 추진 전동기용 베어링 개발에 대한 연구 (Development of Large Propulsion Motor Bearings Considering Slope Conditions)

  • 오승태;최진우;강병희;김진;최성필;빈재구
    • 대한기계학회논문집A
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    • 제37권2호
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    • pp.241-248
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    • 2013
  • 본 논문에서는 상용 회전체 동역학 해석 툴을 이용하여 경사 운전조건을 고려한 대용량 추진 전동기용 베어링 개발에 상사적 설계 방법과 실험적 방법을 적용하였다. 개발된 베어링은 전기적으로 절연이 되어있으며 각 연결부는 2~4mm 의 에폭시 절연판을 연결하여 낮은 열전도 특성을 가지도록 하였다. 본 연구에서는 기존의 저속운전에서 야기되는 베어링 손상 문제를 해결하기 위해 원활한 유막이 생성될 수 있도록 고안한 정압 윤활장치를 적용하여 우수한 윤활특성을 확보하였다. 또한 대형 중량물에 대한 유지보수를 고려하여 반분할 방식의 조립구조를 적용하였다. 본 논문은 고부하, 저속 운전의 추진 전동기 분야에 사용되는 미끄럼 베어링의 주요 핵심설계요소를 언급하였다. 게다가, 시험벤치상에서 다양한 경사조건을 통해 실링부의 오일누유 현상을 확인하였다.

구면 정압베어링의 마찰토크 측정장치 개발 (Development of Friction Torque Measurement Device for Spherical Hydrostatic Bearing)

  • 함영복;최영호;박경민;윤소남;김광영
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2002년도 춘계학술대회 논문집
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    • pp.181-186
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    • 2002
  • Lately, as going on increasing in the demand of high power density(power/weight), it is necessary for hydraulic axial piston pump/motor to operate more high pressure and speed. But in these condition, there are some trouble like as friction loss. To reduce this friction loss, hydrostatic bearing is used far axial piston pump/motor frequently. In general, it is difficult to measure accurate friction torque of spherical hydrostatic bearing in the use of the existing devices. So, we have developed the measurement device using the reaction torque sensor to obtain the pure friction torque, fitted in the casing. In this report, we intend to make an introduction about this measurement device for friction torque of the spherical wear part and clarify the effect of friction characteristics on supply pressure and rotational speed with three types of pocket size by using this measurement device.

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내연기간용 슬라이드 베어링 합금재의 캐비테이션 침식겅동에 관한 연구 (A study on the behaviour of cavltation eroslon atalloy metals of slide bearing for internal combustion engine)

  • 임우조;안석환;이진열
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 1992년도 제16회 학술강연회초록집
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    • pp.44-49
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    • 1992
  • 액체를 취급하는 기계.장치는 유속 및 회전속도 등이 빠르게 되면 유체충격과 정압의 저하에 따른 국부적 비등으로 인해 캐비테이션(cavitation) 현상이 발생한다. 이러한 캐비테이션현상에 따른 소음과 진동율 초래하고, 또한 기포의 붕괴에 따른 형격압으로 캐비테이션-침식(cavitation-erosion)이 발생하여 기계.장치의 구성재료에 손실이 일어남으로써 이들 기계의 효율을 저하시킴과 아울러 수명을 단종시킬 수 있다. 더욱이 부식성의 액체에 사용되는 기계.장치의 금속재료에는 캐비테이션(erosion-corrosion)이 중첩하여 발생하는 경우는 침식과 부식이 상호간에 가속하는 상승효과 때문에 기계.장치의 수명에 치명적인 영향을 미친다. 따라서 본 연구에서는 초음파 진동장치에 의한 각종 유중에서 베어링 합금 1종, 7종 및 켈-멧 4종에 대한 캐비테이션-침식실험을 실시하여, 침식손상거동및 특성등을 구명하고저 하였다.

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EHA 펌프용 피스톤 슈 정압베어링의 경계 마찰 성능 개선 (Performance Improvement of the Hydrostatic Piston Shoe Bearing of an EHA-Piston Pump under Boundary Friction Conditions)

  • 홍예선;권용철;김종혁;이성렬;김병곤;문진삼;김재환
    • 드라이브 ㆍ 컨트롤
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    • 제11권2호
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    • pp.30-35
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    • 2014
  • 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.

저속에서 피스톤 슈 내부 보조 링의 윤활 효과 분석 (Investigation of the Tribological Effects of the Auxiliary Inner Ring for Piston Shoes at Low Speeds)

  • 이성렬;김종혁;홍예선;김병곤;문진삼;문준혁
    • 드라이브 ㆍ 컨트롤
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    • 제12권2호
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    • pp.21-26
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    • 2015
  • 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.

DLC 코팅에 의한 사판식 피스톤 펌프의 저속 영역 동력 손실 개선 (Performance Improvement of a Swash Plate Type Piston Pump in the Low-Speed Range by a DLC Coating)

  • 홍예선;김종혁;이성렬
    • 드라이브 ㆍ 컨트롤
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    • 제11권4호
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    • pp.25-31
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    • 2014
  • 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.