Swash plate in a singlepiston, isothermal axial piston pump. Virtual testing for vehicle, marine, positive displacement devices, valves, turbomachinery, pumps and complete fluid systems. The paper shows the swash plate oscillations due to the pulsating that. In chapter 5 some guidelines for setting up a command. 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. Figure 3 condition of the surface of the od of the swash plate. Note the power may be coming from the shaft to drive the pistons as in a pump, or from the pistons to drive.
In this dissertation, both the ideal and nonideal torque on the cylinder block of an axialpiston swashplate type hydrostatic pump are examined. A linearized model was developed and used to investigate the effect of operating parameters on. This pistons is constructed from the components shown in the illustration. Efforts have been made to digitize the mechanism with feedback and electronic control, but the underlying principle has limited benefits. Swashplate pump article about swashplate pump by the free. This video gives a basic understanding of working of swash plate pumps. Optimum design and control of hydraulic systems driven by. The pump shaft rotation determines flow direction, but you only test the pump in one direction, determined by the universal dynamometer.
Swash plate oscillations due to piston forces in variable. A rotary pump in which the angle between the drive shaft and the plungercarrying body is varied explanation of swashplate pump. It has a fixed displacement axial piston assembly that delivers a given volume of fluid oil for each full rotation of the pump shaft. On application usage of the products the operating conditions of the products shown in this catalog vary depending upon each application. 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. Basic system with hydraulic pump and hydraulic motor or cylinder.
The pistons are arranged on the swash plate providing the lifting impetus. 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 pump motor division problem 10 gpm load sense pump pressure compensator set at 3000 psi load sense differential set at 200 psi. Movement of the swash plate controls pump output from zero to maximum. Chapter 4 describes the complete set of commands of the program swash.
In 1994, kaliafetis and costopoulos 1 studied the static and dynamic characteristics of a standard variable geometric volume swash plate pump with pressure regulator. 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 inline hydraulic piston pump hydraulic pump. Pdf the possibility of distinguishing and assessing the influences of defects in particular pump elements by registering vibration signals at. Pressure differential between the cylinder chamber and outside the pump, was found to be of about 0. In this dissertation, both the ideal and nonideal torque on the cylinder block of an axialpiston swash plate type hydrostatic pump are examined.
Design and analysis of a swashplate control system for an. 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. The swash plate block is a model of a swash plate mechanism used in axialpiston hydraulic pumps and motors to convert translational motion of a piston into rotational motion of a drive shaft. Swashplate type axial piston pumps for open circuits in industrial vehicles on application usage of the products although our products are designed on the basis of our profound knowledge and long experience, and manufactured under the strict quality control system, the following must be taken into consideration in actual use. Pressure compensated control is the most basic control for a variable stroke piston pump. Therefore, an improved swashplate control system based on asymmetricvalvecontrolled asymmetricpiston scheme is presented as well, it is found to be an effective way to suppress the negative impact of swash plate torque on.
Therefore, the decision of the products suitability to the system considered must be made by the. 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. Figure 2 condition of shaft, bearings and swash plate as received. This model illustrates the operation of a swashplate mechanism used in helicopters to translate the input of helicopter flight control into the motion of the rotor blades, and hence controls the orientation of. Swash plate oscillations due to piston forces in variable inline pumps liselott ericson fluid and mechatronic systems flumes, department of management and engineering.
K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various pressure, torque limiter, and a combination of load. The swash plate oscillations due to the internal piston forces, however, are signi. 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. The shafts might be connected to pistons in cylinders. Reduced maximum swash plate angle lowers pistontobore velocity and enables pistons to be more centered on the thrust bearing when swash plate is inclined resulting in increased pump and bearing life two independently controlled, variable displacement, overcenter piston pumps single input drive shaft 2. Kpm swash plate type axial piston pumps programs for industrial vehicles. The mechanism of a variable wobble plate compressor the preferred configuration for a piston compressor soon moved to a double acting swash plate design of which the harrison delphi hd6 is typical. We choose a multipiston axial swashplate pump type wpto210 11, whose simplified diagram is shown in fig. The swash plate of the pump is operated with a heavy spring and a piston. Torque on the cylinder block of an axialpiston swash plate type hydrostatic pump noah denver manring iowa state university follow this and additional works at. The disc is set at an angle so that the follower moves up and down as the disc rotates. The frigidaire f5, a five piston wobble plate configuration, used in the earliest gm vehicles with air conditioning.
However, due to special design of vdaapp valve plate, the swash plate torque severely limits system dynamic response. Multidisciplinary design optimization of a swashplate axial. K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various. These pumps are commonly used in steering gear system. Simulation runs are carried out using this model to evaluate the performance of a. In particular, the double pump with its tandem arrangement, has eliminated a power divider, has an increased transmission efficiency, and is lighter.
There are also studies where the oscillations of the swash plate may be used to reduce torque on the swash plate, in particular the driving torque. Swash plate type axial piston pumps for open circuits in industrial vehicles on application usage of the products although our products are designed on the basis of our profound knowledge and long experience, and manufactured under the strict quality control system, the following must be taken into consideration in actual use. Pressure compensation reduced flow after reaching set pressure. Fhr h hlpd th thr ndrtnd th ntr f nt ltn fr nrlzd jnt. Pdf pressure compensator design for a swash plate axial piston. The fixed plate is shown in gold and six shafts each take a reciprocating motion from points on the gold plate. Pdf dynamic model of axial piston swashplate pump for. Closed circuit a stepbystep guide explanation of symbols, see below left basic system with variable pump and variable motor. Will adjust flow to limit the input torque demand of the pump o. 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.
Pdf file click here for printable worksheet a swash plate cam is usually a disc that rotates around a shaft. A spring pushes the pistons against a stationary swash plate, which sits at an angle to the cylinder. You can connect multiple swash plate blocks to multiple pistons. Swash plate piston pump axial flow variable displacement working animation with detail explanation. A rotary pump in which the angle between the drive shaft and the plungercarrying body is varied explanation of swash plate pump. In a variable displacement pump, if the vector normal to the cam plane swash plate is set parallel to the axis of rotation, there is no movement of the pistons in their cylinders. To use the product safely, you must carefully read all warnings and cautions in this manual.
In this paper a mathematical model for swash plate axial piston pumps with conical cylinder blocks is presented. A swash plate type compressor composed of a pair of cylinder blocks having pistons and a swash plate mounted therein is assembled in such a manner that projections extending partially from the cylinder blocks are brought into abutting relationship. Part of theagriculture commons,bioresource and agricultural engineering commons, and the mechanical engineering commons. Out of a wide variety of our swash plate type axial piston pumps. The variableangle swash plate pump has been a reliable way to transmit fluid power for over 120 years.
A direct displacement control uses a mechanical lever attached to the swashplate of the axial piston pump. Swash plate outlet flow can be varied by changing the shaft drive speed, or by changing the swash plate angle. Since then toyota industries has diversified and expanded the scope of its business domains to include textile machinery, automobiles vehicles, engines, car airconditioning compressors, etc. Torque on the cylinder block of an axialpiston swashplate. A complete analysis of axial piston pump leakage and. The pistons suck in fluid during half a revolution and push fluid out during the other half. Preliminary test results indicate that vdaapp prototype works normally and meets the design requirements for flow ratio, and the maximum rise time of the test pressure is about 0. In these studies, partial mathematical modeling is conducted relevant to the points discussed. Pistons fitted to bores in the cylinder barrel are connected through piston shoes and a shoe plate, so that the shoes bear against an angled swash plate. Axial piston pumps a4vg series 32 in swash plate and bent axis design are intended for the medium and high pressure range. The pistons move back and forth when power from the engine causes the shaft and swash plate to rotate. For a given speed swash plate pumps can be of fixed displacement like this one, or variable by having a variable swash plate angle. An auxiliary pump for replenishment of leakage oil and control of the pump. In particular, the double pump with its tandem arrangement, has eliminated a power divider, has an in.
Concordia university, 2008 swash plate pumps are widely used to drive hydraulic systems, especially because they offer high specific power. In a variable displacement pump, we vary the angle of the rotating group, which is done by tilting the swash plate. Swashplate type axial piston pumps for open circuits in. Swash plate pump construction design of an axial piston pump, in which the swash plate and the control disc are firmly connected to the drive shaft and rotate with it, while the cylinder block, which is firmly connected to the housing, does not rotate figure t 5. Pvm piston pumps pvm018020 pvm074081 service manual. Toyota industries corporation was founded in 1926 by sakichi toyoda to manufacture and sell the automatic looms which he had invented. However, due to special design of vdaapp valve plate, the swash plate. Hydraulictraining axial piston units basic principles. A second area on the high pressure sensing piston accounts for the power of an additional working circuit.
Hydraulic flow is developed as the pump rotating group is. The earliest systems used piston compressors in various configurations. The example below shows how two followers can be used resting on the same swash plate cam. This model contains the complete pump simulation modelwhere the swash plate.
Note similarities to, and differences from, the wobble pump, radial piston pump, and bent axis pump. The greater the slant the further the pistons move and the more fluid they transfer. Btrt nt nl f hplt hn n trnfrtn tr b dvd dr vn th hplt hn d t trnfr rttnl tn nt trnltnl tn nd v vr. At the top of their stroke, the pistons move over the inlet port and draw in fluid at low pressure. Jan 08, 2017 for a given speed swash plate pumps can be of fixed displacement, or variable by having a variable swash plate angle. Swashplate type axial piston pumps for open circuits in industrial vehicles. Figure 6 damage to the swash plate contact surface. Piston motor swash plate type basic characteristics. In order to improve their performance and make them more. For the isothermal liquid library block, see swash plate the swash plate block is a model of a swash plate mechanism used in axialpiston hydraulic pumps and motors to convert translational motion of a piston into rotational motion of a drive shaft. The swash plate block models a single, pistonactuated swash plate within an axialpiston pump. Modeling of swash plate axial piston pumps with conical.
Electrically controlled swash plate axial piston pumps with conical cylinder blocks are recently used in the industry in view of their superior performance. The vibration analysis of constant power regulated swash plate axial piston pumps was carried out. Swash plate piston pump, including cavitation, leakage and detailed features. Types of compressor and structure swash plate type fixed. Torque on the cylinder block of an axialpiston swashplate type hydrostatic pump noah denver manring iowa state university follow this and additional works at. A4vg125 rexroth pdf are the exclusive property of bosch rexroth ag. 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. The basics of variable displacement pump controls crossco. Torque ripple attenuation for an axil piston swash plate.
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. Air conditioning began to become available for vehicles in the early 1950s. Parker hydrostatic tandem pumps grasshopper dealers. From the beginning a number of different compressor technologies have been used. Functional description the hpr 75 02 r tl e models are selfpriming swash plate type axial piston pumps with. The swash plate pump is a positive displacement 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. 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. Swash plate piston pump axial flow variable displacement. This model illustrates the operation of a swashplate mechanism used in helicopters to translate the input of helicopter flight control into the motion of the rotor blades, and hence controls the orientation of the rotor blades. 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. A constant displacement hydraulic pump uses a fixed swash plate to drive a set of pistons in and out as they revolve. The advantages of axial piston pumps with swash plate design is the high nominal pressure level. Vibration analysis of constant power regulated swash plate.
The cylinder barrel in this pump is turned by the drive shaft. Torque on the cylinder block of an axialpiston swash. The mechanism is a combination of a cylinder block or rotor, with the piston fitted inside, and an angled swash plate. Swashplate pump article about swashplate pump by the. Note similarities to, and differences from, the wobble pump. The greater the slant the further the pistons move and the more fluid they. Emitted noise is one of the biggest drawbacks of using.
Construction design of an axial piston pump, in which the swash plate and the control disc are firmly connected to the drive shaft and rotate with it, while the cylinder block, which is firmly connected to the housing, does not rotate figure t 5. Several studies have been carried out to study the characteristics of such novel pump mechanism. As the barrel turns, the piston shoes follow the swash plate. When highpressure oil supplied from the pump flows into the cylinder block through the valve plate, the swash plate is pushed by the force of the piston assembly. Figure 4 closeup of the damage to the balance weight surface. Shown on edge on the far right in the animation is a dark stationary disk. Note that this reference page is for the hydraulics isothermal liquid library block. The fixed swash plate is held between the opposing ends of the double piston by a pair of shoes and two steel balls.
It is advised to read this chapter before consulting the rest of the manual. Swash plate pumps have a rotating cylinder containing pistons. Hydraulictraining axial piston units basic principles re 9060001. Swash plate in a singlepiston, isothermal axial piston. There are two kinds of variabledisplacement axial piston pumps.
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