The swash plate angle can be adjusted, which forces the piston to make larger or smaller strokes. At the heart of the axial piston pump is a group of finely machined pistons that are fitted inside a round cylinder barrel which rotates. An axial piston pump motor having variable tilt angles swash plate stroke control and rotary portface hydraulic distribution control, characterized by a rotary swash plate member in which piston thrust torque reaction and developed torque on the rotary swashplate member is transmitted directly to a rotary main driving shaft by spherically. However, due to special design of vdaapp valve plate, the swash plate torque severely limits system dynamic response. This is a axial piston pump as i discovered when i took the end piece apart to see if there was a problem in the pump. Torque on the cylinder block of an axialpiston swash. K3vls series swash plate type axial piston pump specifications, general descriptions, and features 10 1. On application usage of the products the operating conditions of the products shown in this catalog vary depending upon each application. The swash plate oscillations due to the internal piston forces, however, are signi. It has an adjustable swash plate thats adjusted by loosening a nut, and a clamp that you can see sticking out on the side at the end of the pump. Sae straight thread oring boss recommended installation position.
The n series pump, which was used widely as a piston pump especially for construction machines, has been modified to the k3v series, meeting the presentday. Axial piston pumps in swash plate and bent axis design are intended for the medium and high pressure range. Kpm swash plate type axial piston pumps programs for industrial vehicles. The connecting rods are attached to the thrust plate and revolve with it, unlike the swash plate pump where. Swash plate pump design engineering stack exchange. The rotating pistons periodically connect to the pump intake or discharge through the orifice plate. Ht 16 r 103 0216 e variable displacement closed loop system swash plate axial piston pump k8v via m. Agriculture and forestry machinery a4vg variable axial piston pump of swash plate design for hydrostatic closed circuit transmissions 2.
Fluid flow direction can be reversed by swash plate inclination angle change into the opposite side from neutral position. This cylinder block is driven to rotate about its axis of symmetry by an integral shaft that is, more or less, aligned with the pumping pistons usually parallel but not necessarily. Swash plate piston pump axial flow variable displacement. The vibration analysis of constant power regulated swash plate axial piston pumps was carried out. Closed loop swash plate type axial piston pump k8v series. Pdf displacement control in variable displacement axial.
Pdf pressure compensator design for a swash plate axial piston. Specizcations relief valve 14 pressure cutoff charge pump 15 22. H3v series, swash plate type double piston pumps h3v series double axial type piston pumps specifications spline specifications model model abc d e h3v63 50. Swash plate axial piston pump k7vg series general descriptions reliable highpressure and longlife type this series of highpressure, swash plate type pumps was developed for general industrial machinery use and is based upon our long and rich experience. Contents applications product usage safety precautions handling precautions conversion factors, formula and definition general description and features specifications and features 1. Intended for application in mobile and stationary installations in set with hydrostatic transmissions. Pistons fitted to bores in the cylinder block are connected through piston shoes and a retracting ring so that the shoes bear against an angled swash plate. Torque ripple attenuation for an axil piston swash plate type. The oscillation of the swash plate is one of the major excitation sources in the highspeed piston pump, which may cause lower efficiency, shorter service life, and even serious damage. Torque on the cylinder block of an axialpiston swashplate. High speed realtime controllers were proposed and realized using an national instrument labview field programmable. Danfoss axial piston variable displacement pumps are of swash plate design with variable flow capability suitable for hydrostatic transmissions with closed loop circuit. Multidisciplinary design optimization of a swashplate axial piston.
Therefore, an improved swashplate control system based on asymmetricvalvecontrolled asymmetric piston scheme is presented as well, it is found to be an effective way to suppress the negative impact of swash plate torque on. K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various pressure. Rotating swashplate on piston pump engineering stack. Download the bosch rexroth aa10vso31 size 18 to 140 axial piston swashplate pump data sheet. Efforts have been made to digitize the mechanism with feedback and electronic control, but the underlying principle has limited benefits. An axial piston pump has a number of pistons usually an odd number arranged in a circular array within a housing which is commonly referred to as a cylinder block, rotor or barrel. Traditionally, the torque on the cylinder block has been estimated by using a standard theoreticalexpression that does not consider the compressibility of the fluid or the frictional characteristics within the pump.
Hydraulic axialpiston pump with loadsensing and pressure. Swash plate inline hydraulic piston pump 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. Swash plate 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. A computational model of axial piston swashplate pumps. Kpm swash plate type axial piston pumps programs for industrial vehicles out of a wide variety of our swash plate type axial piston pumps, we introduce below those most suitable for construction machines with open circuits. The flow is pr oportional to the drive speed and displacement. The compact design allows to be mounted directly on the ptos. In particular, the double pump with its tandem arrangement, has eliminated a power divider, has an in. To use the product safely, you must carefully read all warnings and cautions in this manual.
Swash plate 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. Torque ripple attenuation for an axil piston swash plate type core. This enables stable temperature control and improved driving feeling. They are generally the pump of choice for flows over 5lmin and up to 415 bar, if budgets allow. This manual can be viewed on any computer, as well as zoomed and printed, makes it easy to diagnose and repair problems with your machines electrical system. Specications relief valve 14 pressure cutoff charge pump 15 22. The variableangle swash plate pump has been a reliable way to transmit fluid power for over 120 years. In 1994, kaliafetis and costopoulos 1 studied the static and dynamic characteristics of a standard variable geometric volume swash plate pump with pressure regulator. Functional description of regulator load sensing and pressure cutoff 14 pressure cutoff 15 torque limiter 16. A piston pump has a swash plate that pivots back and forth to control the flow rate of the hydraulic fluid. Numerous variations in the designs, performance ranges, and adjustment options offer ideal solutions for mobile and stationary applications. Axial piston pumps have a circular piston group which rotates against an angled swash plate.
A grooved timing plate at the at the top of the pistons controls the way the fluid is drawn through the suction side of the pump and out through the pressure side. Is there a version of this pump where the swash plate rotates like a cam instead of the. The adoption of the highload bearings and frictionfree. 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. Pc3 variable displacement axial piston pump product animation duration.
A common example of a swashplate application in a fluid pump is the compressor of a presentday automobile air conditioning system. Jan 08, 2017 swash plate piston pump axial flow variable displacement. 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. A complete analysis of axial piston pump leakage and output. You can connect multiple swash plate blocks to multiple pistons. Is committed to providing customers with highquality hydraulic control components and hydraulic system design, maintenance and other services. The flow can be infinit ely varied by adjusting the swash plate angle.
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. Figure 3 shows a freebody diagram of the swash plate. Variable displacement axial piston pumps swash plate design ideally suited for medium and. Swash plate inline hydraulic piston pump hydraulic pump. The control torque on the swash plate of an axialpiston pump. Therefore, the decision of the products suitability to the system considered must be. The pump shaft rotation determines flow direction, but you only test the pump in one direction, determined by the universal dynamometer. Computational valve plate design purdue university. Inline piston pump the simplest type of axial piston pump is the swash plate design in which a cylinder block is turned by the drive shaft. Swash plate oscillations due to piston forces in variable in. K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various. In general, the swash plate design is used for pumps and the bent axis design for motors although there are applications where this is not the best solution. In a fixed displacement pump the cylinder barrel is inclined at an angle to the drive shaft so that as the cylinder rotates one revolution, the pistons complete a full stroke. Inline piston pump the simplest type of axial piston pump is.
Variable orifice in an isothermal axialpiston machine simulink. By eliminating this cross over, the backlash in the pump control which is commonly observed in practice. Model a10vso axial piston swashplate pump series 32 variable displacement, open circuit. Torque on the cylinder block of an axialpiston swashplate type hydrostatic pump noah denver manring iowa state university follow this and additional works at. Axial piston pumps are widely used throughout the mobile and industrial sectors. Displacement control can be achieved by either internally controlled variable displacement or. Variable displacement axial piston pumps swash plate design ideally suited for open circuit truck applications.
Variable axial piston pump 416 series technical catalogue. The swash plate block models a single, piston actuated swash plate within an axial piston pump. Var iable pump with axial piston rotary group in swash plate design for hydrostatic drives in open circuit. My understanding of swash plates led me to believe that the pistons in a swash plate pump rotate around with the driving shaft along with the chambers in which they aspirate e. They are characterized by low noise emission, short response time and flexible operation thanks to the wilde range of mechanical controls, see section. Us3911791a swashplate drive for axial piston pumps.
Therefore, the decision of the products suitability to the system considered must be made by the. Swash plate type axial piston pumps for open circuits in industrial vehicles. By varying the angle of the swashplate, the pistons stroke and, therefore, the compressors. Displacement control can be achieved by either internally controlled variable displacement or externally controlled variable displacement methods. Displacement control in variable displacement axial piston swashplate type pumps conference paper pdf available may 2011 with 1,121 reads how we measure reads. The valve plate orifice il block models a crescentshaped opening between moving pistons and a pump in an axial piston machine. Dec 14, 2007 in designing an axial piston pump, lot of attention is given to the design of the valve plate. Designing a control and containment device for cradle. A 75cm3rev swash plate type axial piston pump was modi. Swash plate in a singlepiston, isothermal axial piston pump. Swash plate piston pump, including cavitation, leakage and detailed features.
K8v series closed loop swash plate type axial piston pump specifications, general descriptions, and features 10 1. Design axial piston pump of cradle swashplate design with variable displacement direction of rotation clockwise, counterclockwise. As the rotary group turns the pistons are pushed forwards and backwards. A well designed valve plate can reduce both flow pulsations as well as oscillating forces on the swash plate. 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. Principles and applications of the axial piston pump. Specications relief valve 14 pressure cutoff charge pump. 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. Nov 15, 2017 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. It has a fixed displacement axial piston assembly that delivers a given volume of fluid oil for each full rotation of the pump shaft. Active vibration control of swash platetype axial piston.
Variable displacement piston pump hydraulic pump basics bias spring shaft barrel piston swash plate outlet flow can be varied by changing the shaft drive speed, or by changing the swash plate angle. The axial piston pump drives a series of pistons aligned parallel with a shaft through a swashplate to pump a fluid. An axial piston pump is a positive displacement pump that has a number of pistons in a circular array within a cylinder block. Out of a wide variety of our swash plate type axial piston pumps. Pressure differential between the cylinder chamber and outside the pump, was found to be of about 0. Torque on the cylinder block of an axial piston swash plate type hydrostatic pump noah denver manring iowa state university follow this and additional works at. This paper investigates a pressurecontrolled axial inline pump with variable displacement. K piston stroke m i axial index k fluid bulk modulus pa m x swash plate moment about x axis nm m y swash plate moment about y axis nm m z swash plate moment about z axis nm n rotational speed rpm p pressure pa p i i th displacement chamber pressure pa p dc displacement chamber pressure bar. We choose a multipiston axial swashplate pump type wpto210 11, whose simplified diagram is shown in fig.
For pvpc pumps with electrohydraulic proportional controls, see tech table as170. Piston slipper valve plate cylinder block input shaft rear bushing bushing seal typical name plate modelno. In the bent axis pump,the pistons are at an angle to the drive shaft and thrust plate. Variable displacement closed loop system swash plate axial. Design and analysis of a swashplate control system for an. Part of theagriculture commons,bioresource and agricultural engineering commons, and the mechanical engineering commons. Vibration analysis of constant power regulated swash plate. As the axial position of the pistons change, the piston. What are the differences between bent axis pump and swash. K8v series closedloop variable displacement type axial piston pump specifications, general descriptions, and features 10 1. H1 pumps general specification axial piston closed circuit variable displacement pumps of cradle swash plate design with clockwise or counterclockwise direction of rotation. It can be used as a standalone pump, a hydraulic motor or an automotive air conditioning compressor. Pdf an inline axialpiston swashplate pump with pressure compensator is widely used for its fast speed of response and power economy.
Swashplate type axial piston pumps for open circuits in. Swash plate in a singlepiston, isothermal axial piston. In this dissertation, both the ideal and nonideal torque on the cylinder block of an axial piston swash plate type hydrostatic pump are examined. Effect of case drain pressure on slipperswashplate pair within axial piston pump. Variable displacement axial piston pumps with swash plate design suited for high pressure open circuits. Pdf effect of case drain pressure on slipperswashplate. Komatsu swash plate type piston pumps pdf manufactured by the company komatsu presented for you in electronic format page size 595 x 842 pts a4 rotated 0 degrees. A linearized model was developed and used to investigate the effect of operating parameters on. The swash plate pump is a positive displacement pump. Variable orifice in an isothermal axialpiston machine. The control valve and actuator are modelled to allow the oscillations of the swash plate to be studied.
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