• 제목/요약/키워드: Axial Piston Pump

검색결과 85건 처리시간 0.032초

피스톤 펌핑 위상이 텐덤형 사판식 액셜 피스톤 펌프의 진동, 소음에 미치는 영향에 관한 연구(2) (A Study on Effects of Piston Pumping Phase on Vibration and Noises of Tandem Swash Plate Type Axial Piston Pump(2))

  • 박성환;이진걸
    • 한국정밀공학회지
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    • 제16권12호
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    • pp.31-39
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    • 1999
  • Previous researches and experiments have already verified that the primary noise source of high pressure tandem axial thpe piston pump is fluid-borne noise from the process of oil distribution between the kidney-shaped port and valve plate. So, many researchers have improved pressure gradients and reduced sound levels by applying pre-compression and pre-decompression metering grooves to valve plate. In practice however, the sound level of th high pressure tandem axial type piston pump is still undesirable. This paper testified the effect of pumping phase of the piston on vibration and noise of th high pressure tandem axial type piston pump on the best of theoretical research in $this^(1)$. Therefore considering the pumping phase of the piston when assembling the tandem axial type piston pump, it is possible to reduce 1.5~2[dB]of sound level.

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사판식 액셜피스톤 펌프-레귤레이터계의 선형화해석에 의한 유압제어특성 고찰 (A Study on Hydraulic Control Characteristics of a Swashplate Type Axial Piston Pump-Regulator System by Linearization Analysis)

  • 조승호;김원수
    • 대한기계학회논문집A
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    • 제24권10호
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    • pp.2535-2542
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    • 2000
  • The regulator system has been modeled and combined to a swashplate type axial piston pump. Linear approximation has been performed for nonlinear coefficient terms of an axial piston pump-regulator model without significantly affecting accuracy. Based on the mathematical model of an axial piston pump-regulator system, a couple of characteristic curves of negative flow control and horsepower control are drawn, which show a good correlation with those of experimental results. So the simplified axial piston pump-regulator model in this paper is expected to be utilized not only for the design and analysis of hydraulic circuit of excavator but also for prevention of engine overload.

피스톤 펌핑 위상이 텐덤형 사판식 액셜 피스톤 펌프의 진동 ${\cdot}$ 소음에 미치는 영향에 관한 연구(1) (A Study on Effects of Piston Pumping Phase on Vibration and Noises of Tandem Swash Plate Type Axial Piston Pump(1))

  • 박성환;이진걸
    • 한국정밀공학회지
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    • 제16권5호통권98호
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    • pp.74-82
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    • 1999
  • To meet the needs of the hydraulic excavator of large capacity, tandem axial type piston pump which is high pressure and high speed have been developed. But inevitably we can not help facing the problem of noise at that time. In order to reduce the noise of this pump, many researchers have been studying the problem of oil distribution manner. But they are not interested in the symmetric structure of tandem type pump. So, focusing on the symmetric structure of tandem type pump, this paper analyzed unbalanced force developed in the pump chamber and verified the effect of the pumping phase of the piston on vibration and noise of the tandem axial type piston pump theoretically.

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차륜형 장갑차용 액시얼 피스톤 펌프 개발을 위한 피스톤 수에 대한 시뮬레이션에 관한 연구 (A Study on Simulation of Piston Number for Development of Axial Piston Pump for Wheeled Armored Vehicle)

  • 최성웅;이창돈;양순용
    • 드라이브 ㆍ 컨트롤
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    • 제16권1호
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    • pp.14-21
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    • 2019
  • Axial piston pump is a significant part in wheeled armored vehicle, for generating hydraulic power of vehicle power system. The Axial Piston Pump is a high-performer, core functional item that is developed and applied to most of the military models in the development of military weapon systems. However, in the case of military equipment, there are conditions of limited size and weight required depending on the operating conditions and the operating environment. Under these conditions, it is required that the performance and the environmental resistance are verified to exert the required output. A unique technology is needed for the development of such equipment both in the present and in the future. Therefore, in this study, mathematical modeling of an axial piston pump is presented as a basic data for securing proprietary technology. In addition, a simulation model is designed and compared with the models of six kinds of pistons through simulation. It was established that when the number of pistons of the axial piston pump, which is the development objective, is seven, the model is suitable for the wheeled armored vehicle.

유압 피스톤 펌프의 피스톤 마모에 대한 표면경도의 영향 (Effect of surface hardness on piston wear in the oil hydraulic piston pump)

  • 김종기;정재연
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 2001년도 제33회 춘계학술대회 개최
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    • pp.340-345
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    • 2001
  • Surface hardness is one of the major sources on wear in the oil hydraulic axial piston pump. To increase the performance of the oil hydraulic axial piston pump, it is need to know the surface layer characteristics in the sliding contact parts of them. This paper reports an experimental study on surface treatment characteristics in the piston of the oil hydraulic axial piston pump. We investigated surface wear with not only surface hardness and surface roughness but also material of the piston. We obviously observed that the surface hardness of piston in the oil hydraulic axial piston pump plays an important role to high power density and remain long life.

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A Study on the Characteristics of Volumetric Efficiency of an Axial Piston Pump considering Piston Tilting

  • Park, In-Kyu;Rhim, Yoon-Chul
    • KSTLE International Journal
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    • 제10권1_2호
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    • pp.37-42
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    • 2009
  • This paper presents the characteristics of volumetric efficiency of an axial type piston pump considering the piston tilting. A numerical analysis is carried out in order to obtain the pressure distribution considering the fluid inertia at the notch of the valve plate. The cylinder pressure variation and the discharge flow rate are measured experimentally according to the operating conditions such as supply pressure, rotational speed, and viscosity of the working fluid by using the cam type test apparatus. Leakage is also measured considering piston tilting. The characteristics of the volumetric efficiency are analyzed with respect to various operating conditions and leakage is also analyzed according to the piston tilting angle. Results are applicable to improve the design of an axial type piston pump.

Effect of surface Treatment on Piston Wear in the Oil Hydraulic Piston Pump

  • Kim, Jong Ki;Park, Kyung Min;Oh, Seok Hyung;Jung, Jae Youn
    • KSTLE International Journal
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    • 제2권1호
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    • pp.17-21
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    • 2001
  • Surface treatment technologies are frequently used to improve mechanical properties of surface layers of machinery components in many practical situations. Surface hardness of piston in the oil hydraulic piston pumps is very important about wear resistance. To improve hardness, wear resistance of the oil hydraulic axial piston pump, it is needed to know the surface layer characteristics in the sliding contact parts. This paper reports an experimental study on surface treatment characteristics in the piston of the oil hydraulic axial piston pump. We investigated the surface wear of a piston between untreated and nitriding-treated surfaces. We obviously observed that the surface hardness of piston in the oil hydraulic axial piston pump plays an important role to have wear resistance and remain a longer life.

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사축식 유압 피스톤 펌프의 압력 맥동 특성에 관한 연구 (A Study on Pressure Ripple Characteristics in Bent-Axis Type Oil Hydraulic Piston Pump)

  • 조인성;신창근;정재연
    • Tribology and Lubricants
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    • 제27권4호
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    • pp.218-223
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    • 2011
  • To improve the performance of a bent-axis type axial piston pump driven by the tapered pistons, it is necessary to know the pressure ripple characteristics. The purpose of this paper is to understand the effect on the pressure ripple characteristics and the prediction by comparing experimental and theoretical results. The simulation model of the bent-axis type axial piston pump is developed in the AMESim environment using the geometrical dimension and the driving mechanism of the piston pump. The results can be obtained to predict the performance characteristics of the bent-axis type axial piston pump.

등속조인트를 적용한 사판식 유압 모터/점프의 로드형 피스톤에 대한 운동해석 (A Kinematic Analysis on Piston Rod Mechanism in Swashplate Type Hydraulic Axial Piston Motor/Pump Using Constant Velocity Joint)

  • 김경호;김성동;함영복;이재천
    • 유공압시스템학회논문집
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    • 제2권1호
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    • pp.1-8
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    • 2005
  • Recently, swash plate type hydraulic axial piston motors/pumps are being extensively used in the world, because of simple design, light weight and effective cost. Structural problem of the swash plate type motor/pump is that tilting angle of swash plate should be limited to relatively small value and lateral farce on pistons has an undesirable effect in reciprocating motion. To solve these problems, piston rod mechanism, which is commonly used in bent axis type motor/pump, is considered to be applied to the swash plate type motor/pump. In this paper, kinematic analysis was done on the piston rod mechanism. A series of formula were derived and numerical calculations were done for a set of motor parameters.

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