Pump leakage was studied for different swash plate angles and turning speeds. 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. The dynamic oscillation of the swash plate therefore dominates the commutation phenomena. A swash plate type variable capacity compressor having rotary valves that rotate together on a rotating shaft. Hydraulictraining axial piston units basic principles. The motor function is the reverse of the pump function. 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. Axialpiston swashplate type hydrostatic pumps are used within hydraulic circuitry for. The basics of variable displacement pump controls crossco. Part of theagriculture commons,bioresource and agricultural engineering commons, and the mechanical engineering commons. K8v series closed loop swash plate type axial piston pump specifications, general descriptions, and features 10 1. Rotary pump article about rotary pump by the free dictionary.
The fixed swash plate is held between the opposing ends of the double piston by a pair of shoes and two steel balls. Toyota industries corporation was founded in 1926 by sakichi toyoda to manufacture and sell the automatic looms which he had invented. 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. In a variable displacement pump, we vary the angle of the rotating group, which is done by tilting the swash plate. 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. Us5630707a variable displacement mechanism for swash. 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. 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. Torque on the cylinder block of an axialpiston swash. A linearized model was developed and used to investigate the effect of operating parameters on.
Torque ripple attenuation for an axil piston swash plate type. 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. Vanetype hydraulic pumps generally have circularly or elliptically shaped interiors and flat end plates. The pulsating forces on the swash plate will also create noise from mechanical vibrations. 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. K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various pressure. F z is the corresponding force from all pistons acting on the swash plate valve plate, illustrated in. Swash plate in a singlepiston, isothermal axial piston. If the outside load changes, then the valve spool moves and changes the swash plate. A common example of a swashplate application in a fluid pump is the compressor of a presentday automobile air conditioning system. Swash plate oscillation in a variable displacement floating cup pump. 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.
The swash plate pump is a positive displacement pump. 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. Rotary pump a type of positivedisplacement rotary pump, used chiefly for pumping highly viscous fluids without abrasive impurities. Reviews free ebook library digital health check inmarket buyer report media kit. The pistons are connected to a shoe plate that bears against an angled swash plate. The rotary valves are arranged on the shaft in such a manner that, upon one complete rotation, the rotary valves are connected, in sequential manner, for respective rotating angles, with circumferentially spaced piston chambers via respective intake passageways on the rotary valves. Episod 15 how the hydraulic swash plate type piston pump. Swashplate pump article about swashplate pump by the free. Effects of flow inertia modelling and valveplate geometry. The variation of the control pressure demands the swash plate to oscillate around the average swash plate position, which is defined by the control system of the pump or motor. Torque ripple attenuation for an axil piston swash plate. Nov 28, 2019 in particular, the variable capacity type swash plate compressor disclosed in korean patent application publication no. Note similarities to, and differences from, the wobble pump, radial piston pump, and bent axis pump. Ep1519006b1 swash plate type hydraulic pump or motor.
It was originally invented to replace a crankshaft, and. A complete analysis of axial piston pump leakage and. An axial piston pump is a positive displacement pump that has a number of pistons in a circular array within a cylinder block. Pdf load and stress analysis for the swash plate of an axial. Dynamic highfrequency behaviour of the swash plate in a. Types of compressor and structure swash plate type fixed. Besides reducing pressure ripples and avoiding cavitation for minimizing the fluidborne noise, maximization of the pump discharge has also been considered in. It has a fixed displacement axial piston assembly that delivers a given volume of fluid oil for each full rotation of the pump shaft. Specications relief valve 14 pressure cutoff charge pump 15 22. Vibration analysis of constant power regulated swash plate. Figure 39 illustrates a vane pump with a circular interior. 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.
Swashplate pump article about swashplate pump by the. 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. In this case, hydraulic oil is fed via the connection plate through a control slot to the cylinder bores. K3v280 oe00hitachi, swash plate type piston pump shp. The vibration analysis of constant power regulated swash plate axial piston pumps was carried out. 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 principle of operation of a rotary pump is based on. The flow can be infinit ely varied by adjusting the swash plate angle. Swash plate piston pump axial flow variable displacement. The adoption of the highload bearings and friction free. A complete analysis of axial piston pump leakage and output. Pdf in an axial piston pump design, the swash plate plays an important role in controlling the. A rotary pump in which the angle between the drive shaft and the plungercarrying body is varied explanation of swash plate pump.
The present work aims at developing a methodology for designing a swashplate axialpiston pump whose barrel kidneys are wider than the bridges separating the kidney ports on the plate. Dec 26, 1995 in the swash plate type variable capacity compressor according to the first embodiment, when the value of the intake pressure ps is larger than 2 atm as a result of a large thermal load at the refrigerating cycle, the diaphragm 54 moves upwardly in fig. Shp hydraulic pump service 6860 south pine street ext. Us5630707a variable displacement mechanism for swash plate. It is delivering more accurate results for our hydraulic pump and valve modeling efforts than previous cfd packages, saving us time and money. This article explains what axial piston pumps are and how they work. Introduction positive displacement machines by definition have sliding. The forces and distances of the action point are shown in fig. Torque on the cylinder block of an axialpiston swashplate type hydrostatic pump noah denver manring iowa state university follow this and additional works at. The pistons within each cylinder are attached to a swashplate. Swash plate oscillation in a variable displacement floating. 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.
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. It has also been proven that the overall efficiency is substantially. To use the product safely, you must carefully read all warnings and cautions in this manual. You can connect multiple swash plate blocks to multiple pistons. Torque on the cylinder block of an axialpiston swashplate. All about axial piston pumps what they are and how they work. A swashplate also known as slant disk was invented by anthony george maldon michell in 1917. More the use of simericsmp has validated the solution to our cavitation issue and provided us with a greater understanding of the dynamic fluid stresses within our pumps. In particular, the double pump with its tandem arrangement, has eliminated a power divider, has an in.
In for instance a slipper type pump, this condition can. A slotted rotor is fixed to a shaft that enters the pumphousing cavity through one of its end plates. It can be used as a standalone pump, a hydraulic motor or an automotive air conditioning compressor. The flow is pr oportional to the drive speed and displacement. K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various. Pdf in this paper a mathematical model for swash plate axial piston pumps with conical. Pressure compensated control is the most basic control for a variable stroke piston pump.
These so called svalves define a certain operating angle, while leaving the swash plate free to oscillate, in the same way as during real pump operation. The swash plate block models a single, pistonactuated swash plate within an axialpiston pump. In this study, the vibrating movement of the swash plate is measured. The pump shaft rotation determines flow direction, but you only test the pump in one direction, determined by the universal dynamometer. It is a mechanical engineering device used to translate the motion of a rotating shaft into reciprocating motion, or vice versa. Although this study is performed on a floating cup. A spring pushes the pistons against a stationary swash plate, which sits at an angle to the. Episod 15 how the hydraulic swash plate type piston pump works in hindi. Specications relief valve 14 pressure cutoff charge pump. Swash plate axial piston pump on sales quality swash. A plurality of pistons are housed in the cylinder block from both sides thereof, and the pistons stroke according to the tilt angle of each of the swash plates. The opposing type swash plate hydraulic pump or motor has a swash plate disposed on both sides of a cylinder block. As the shaft rotates, the swash plate that is integrated with the shaft converts this rotational movement into reciprocating movement of the pistons, which draw and compress the refrigerant gas.
The pistons are connected to a shoe plate that bears against an angled. Swashplate type axial piston pumps for open circuits in. Hydraulic flow is developed as the pump rotating group is. Leakage was found to be smaller at low speeds free body diagram of the swash plate. Swash plate pumps have a rotating cylinder containing pistons. Swash plate in a singlepiston, isothermal axial piston pump. Swash plate oscillation in a variable displacement.
The working principles is similar to crankshaft, scotch yoke, or wobblenutatorzcrank drives, in engine designs. By varying the angle of the swashplate, the pistons stroke and, therefore, the compressors. Swash plate pump definition and meaning collins english. The axial piston pump drives a series of pistons aligned parallel with a shaft through a swashplate to pump a fluid. Torque ripple attenuation for an axil piston swash plate type core.
In particular, the double pump with its tandem arrangement, has eliminated a power divider, has an increased transmission efficiency, and is lighter. Figure 32 shows the freebody diagram of the cylinder block. Var iable pump with axial piston rotary group in swash plate design for hydrostatic drives in open circuit. A principle sketch of the rotating group and the swash plate is shown in fig. The swash plate oscillation creates an additional displacement of the pump, especially during commutation, which is often larger than the original sinusoidal movement. He also studied experimentally the influence of slippers with different lands, focusing on torque and leakage at different turning speeds. The control torque on the swash plate of an axialpiston pump. The swash plate compressor according to claim 1, wherein the first orifice hole is formed on the suction plate.
Kpm swash plate type axial piston pumps programs for industrial vehicles. For a given speed swash plate pumps can be of fixed displacement like this one, or variable by having a variable swash plate angle. Leakage was found to be smaller at low speeds swash plate angles, and increased with turning speed. The greater the slant the further the pistons move and the more fluid they transfer. A number of small rectangular plates or vanes are set into the slots of the rotor. Closed loop swash plate type axial piston pump k8v series. F z is the corresponding force from all pistons acting on the swashplatevalve plate, illustrated in. Although somewhat expensive, piston pumps are among the most efficient types of pumps.
The swash plate oscillation creates an additional displacement of the pump. The actuator forces from the freebody diagram are derived as. In this type, the cylinder block and drive shaft are located on the same centerline. A rotary pump in which the angle between the drive shaft and the plungercarrying body is varied explanation of swashplate pump. Direction of rotation clockwise counterclockwise viewed from shaft end ordering code specifications k3v 280 dt h 100 r 2n 01 1mpa 10. 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. A hydraulic pump utilizes the twoposition, threeway solenoid valve to control the pump outlet pressure shown in figure 2. Torque on the cylinder block of an axialpiston swashplate type. The following is an outline of the swash plate type compressor. 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. Two axial piston pump principles are investigated and compared.
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