One of the most common hydraulic pumps is the axial piston pump, which is used in many industrial applications as well as offhighway and mining. Us5630707a variable displacement mechanism for swash. Fixed displacement type axial piston motors m7x series general descriptions applicable to an open circuit and closed circuit. The axial piston pump drives a series of pistons aligned parallel with a shaft through a swashplate to pump a fluid. These pumps are commonly used in steering gear system. Failure analysis a guide to analyzing axial piston pump failures oilgear company milwaukee, usa 80776, rev.
K3vls series swash plate type axial piston pump specifications, general descriptions, and features 10 1. A block diagram of the pressure control system is shown in fig. The axial piston pump type v30d is designed for open circuits in industrial. Proportional displacement control 16 electric proportional control 17.
Due to many advantages, swash plate pumps are wide spread in hydraulic systems. A developed numerical algorithm facilitated the simultaneous calculation of timevarying cylinder pressure, rotating body motion, and fluid film pressure to observe. By varying the angle of the swashplate, the pistons stroke and, therefore, the compressors. In a variable displacement pump, we vary the angle of the rotating group, which is done by tilting the swash plate. Axial piston variable pump spv 2, displacement 89,0 cm3, orientation of rotation. V90n variable axial piston double pump is designed for the high pressure open circuit. A complete analysis of axial piston pump leakage and. Principles and applications of the axial piston pump. K8v series closedloop variable displacement type axial piston pump specifications, general descriptions, and features 10 1. It has a fixed displacement axial piston assembly that delivers a given volume of fluid oil for each full rotation of the pump shaft.
The accumulator pressure was regulated to supply oil to a servovalve at a reference level. Closed loop swash plate type axial piston pump k8v series. The pistons are stroked by a fixed angled plate called the swash plate. The hydraulic pump or motor as defined in any one of claims 14, further comprising drive pistons 33, 34, 43, 44 that push the first swash plate 30 and the second swash plate 40 in order to change a tilt angle of the first swash plate 30 and a tilt angle of the second swash plate 40, respectively. Active vibration control of swash platetype axial piston.
We choose a multipiston axial swashplate pump type wpto210 11, whose simplified diagram is shown in fig. A variable displacement mechanism for a swash plate hydraulic pump or motor, in which a swash plate, a swash plate guiding wall, a tilting control piston, and a swash plate tilting guiding and swash plate rotation preventing pin are included for varying the requiring flow rate volumetric displacement per revolution without the rotation of the swash plate even during the tilting of the swash. Swash plate piston pump axial flow variable displacement. Swashplate type axial piston pumps for open circuits in. Applicable to construction machinery and industrial vehicles. Pdf in this paper a mathematical model for swash plate axial piston pumps. The displacement is controlled by varying the swash plate angle which in turn varies the piston travel through a stroke, thus resulting in variable flow. In 1994, kaliafetis and costopoulos 1 studied the static and dynamic characteristics of a standard variable geometric volume swash plate pump with pressure regulator. The swash plate pump is a positive displacement pump. The objective of this application study was to investigate the effect of surface nonflatness on the lubrication characteristic of the bearingsealing part between cylinder barrel and valve plate in a hydrostatic axial piston pump. Torque ripple attenuation for an axil piston swash plate type core. K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various.
V90n swashplate type axial piston double pump series 0112 technical data 02 type introduction 0304 control principle e1 electroproportional displacement control principle 05 h1h2h3 negative flow control schematic 0506 installation size. A 75cm3rev swash plate type axial piston pump was modi. Torque on the cylinder block of an axialpiston swash. Swashplate axial piston pump general descriptions the k3vl series swash plate type axial piston pumps are designed to satisfy the marine, mobile and industrial markets industrial machinery market where a mediumhigh pressure variable displacement pump is required.
Dynamic highfrequency behaviour of the swash plate in a. Vibration analysis of constant power regulated swash plate. Swashplate type axial piston pumps for open circuits in industrial vehicles. Shaft loading and bearing life conversion factors, formula and definition 8 k3vls series swash plate type axial piston pump specifications and features 10 specications, general descriptions, and features 1. The boosting of the low pressure side enhances the pumpoperating characteristics. A computational model of axial piston swashplate pumps. Constant pressure control of a swash plate type axial piston pump. Typical features of the closed circuit for axial piston units are. Hydraulic pumpmotor division hydraulic flow is developed as the pump rotating group is driven by a prime mover hydraulic pump basics fluid is forced out of pump at the pump outlet a partial vacuum is created at the pump inlet and atmospheric pressure forces fluid into pump from the reservoir. An alternative form of piston pump is the axial design of figure 2.
Danfoss axial piston variable displacement pumps are of swash plate design with variable flow. In this type, the axial reciprocating motion of the pistons is obtained by a swash plate that is either fixed or variable in its degree of angle. This video gives a basic understanding of working of swash plate pumps. Torque on the cylinder block of an axialpiston swashplate type hydrostatic pump noah denver manring iowa state university follow this and additional works at. High power density a lighter and more compact machine with higher. Sand or silica in particular, due to its abrasive nature, does significantly reduce the expected life of a pump. A common example of a swashplate application in a fluid pump is the compressor of a presentday automobile air conditioning system. Contact your danfoss representative for an evaluation of unit bearing life if you have continuously applied external loads exceeding 25 % of the maximum allowable radial load re or the pump swashplate is positioned on one side of center all or most of the time. The pump shaft rotation determines flow direction, but you only test the pump in one direction, determined by the universal dynamometer. Dynamic modelling of the swash plate of a hydraulic axial piston.
The swash plate of the pump is operated with a heavy spring and a piston. As a result they vary the ow rate that is provided to the consumers. Functional description of regulator load sensing and pressure cutoff 14 pressure cutoff 15 torque limiter 16. The advantages of axial piston pumps with swash plate design is the high nominal pressure. Hydraulictraining axial piston units basic principles.
Kpm swash plate type axial piston pumps programs for industrial vehicles displacement 60 cm3 double pump tandem type k3v63dt k5v80dt double pump parallel type k3v63dtp k5v80dtp single pump k3v63sk5v80s 80 a thorough function desigh enabled such atractive features 1. The invention relates to an axial piston pump having a swashplate type construction, in particular for hydraulic systems, comprising a cylinder drum 3 which can be rotationally driven about a rotational axis 7 in a pump housing 1 and in which pistons 9 are arranged in an axially displaceable manner, supporting by means of the actuation end thereof 11 which is accessible from the. Swash plate inline hydraulic piston pump hydraulic pump. It translates linear actuation into rotational motion that, when connected to the valve plate orifice il block, periodically connects the piston with the pump intake and discharge. In particular, the double pump with its tandem arrangement, has eliminated a power divider, has an increased transmission efficiency, and is lighter. M7v series swash plate type axial piston motor specifications and features 8 1. Functional description of regulator load sensing and pressure cutoff 14 torque limiter 15 torque limiter with power shift 17 3. Two position displacement control 14 electric control 15 32. Torque ripple attenuation for an axil piston swash plate. Part of theagriculture commons,bioresource and agricultural engineering commons, and the mechanical engineering commons.
Noise considerations presented by viral mehta a candidate for the degree of doctor of philosophy and hereby certify that in their opinion it is worthy of acceptance. As the piston barrel assembly rotates, the pistons rotate around the shaft, with the piston shoes in contact with and sliding along the swash plate surface. Yamaguchicharacteristics of a slipper bearing for swash plate type axial piston pumps and motors, experiment bull. In particular, the double pump with its tandem arrangement, has eliminated a power divider, has an in. K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various pressure. Their use is limited to noncorrosive fluids because the working fluid also provides lubrication to the hydrodynamic bearings. Swashplate axial piston pump sae b sae e splinespline sae b. Swashplate axial piston pump k7vg series general descriptions reliable highpressure and longlife type this series of highpressure, swashplate type pumps was developed for general industrial machinery use and is based upon our long and rich experience. To use the product safely, you must carefully read all warnings and cautions in this manual. High speed realtime controllers were proposed and realized using an national instrument labview field programmable. Axial piston pump, swash plate behaviour, performance. This force f is resolved through the shoe 2 into vector force f1 which acts perpendicular to the swash plate 3, and vector force f2 which is a vertical force with respect to the output shaft.
Multidisciplinary design optimization of a swashplate axial. Throughout the industrial workplace, hydraulic pumps provide a great deal of motive power, efficiently translating the rotary motion of a prime mover into hydraulic oil flow that can be easily routed and used for a vast range of tasks. Swashplate axial piston pump general descriptions the k3vl series swash plate type axial piston pumps are designed to satisfy the marine, mobile and industrial markets where a mediumhigh pressure variable displacement pump is required. Ivantysynova investigated extensively axial pistons swashplate. Pressure compensated control is the most basic control for a variable stroke piston pump. Swashplate axial piston pump k3vl b series general descriptions the k3vl series swash plate type axial piston pumps are designed to satisfy the marine, mobile and industrial markets where a mediumhigh pressure variable displacement pump is required. Axial piston pump, swash plate, model introduction modeling of the conventional swash plate axial piston pumps was the focus of many studies in the last decade. Ep1519006b1 swash plate type hydraulic pump or motor. Proceedings of the second jhps international symposium on fluid power, tokyo, japan, 69 september 1993, pp.
In this video we have explained all the components of the pump and how each components contribute to its working, you can see how the flow can be varied using the swash plates and how the pistons. You must also observe the related regulations and rules regarding. The vibration analysis of constant power regulated swash plate axial piston pumps was carried out. Danfoss recommends clamptype couplings for applications with radial shaft loads. Kpm swash plate type axial piston pumps programs for industrial vehicles. Specizcations relief valve 14 pressure cutoff charge pump 15 22. The swash plate is controlled by the pressurecompensated valve, which uses pressure feedback so that the instantaneous output flow of the pump is exactly enough to maintain a presetting pressure. Swash plate in a singlepiston, isothermal axial piston.
The basics of variable displacement pump controls crossco. A new prediction method of operating moment and cylinder pressure of a swash plate type axial piston pump. A linearized model was developed and used to investigate the effect of operating parameters on. Pressure compensation reduced flow after reaching set pressure.
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