These pumps are commonly used in steering gear system. K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various pressure. Effects of flow inertia modelling and valveplate geometry on. Dynamic highfrequency behaviour of the swash plate in a. The pump shaft rotation determines flow direction, but you only test the pump in one direction, determined by the universal dynamometer. Pdf an inline axialpiston swashplate pump with pressure compensator is widely used for its. Downloads brochures, datasheets and drawings kpmus. Servo valves have been designed and built into the pump.
Swashplate type axial piston pumps for open circuits in. On application usage of the products the operating conditions of the products shown in this catalog vary depending upon each application. The swash plate of the pump is operated with a heavy spring and a piston. The adoption of the highload bearings and frictionfree. The swash plate pump is a positive displacement pump.
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. Torque ripple attenuation for an axil piston swash plate type core. The shafts might be connected to pistons in cylinders. Torque ripple attenuation for an axil piston swash plate type. The fixed plate is shown in gold and six shafts each take a reciprocating motion from points on the gold plate.
Pressure differential between the cylinder chamber and outside the pump, was found to be of about 0. A complete analysis of axial piston pump leakage and output. Note the power may be coming from the shaft to drive the pistons as in a pump, or from the pistons to drive. 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. Contents applications product usage safety precautions. Typical type is variable piston pumps hydraulic pump basics. K8v series closed loop swash plate type axial piston pump specifications, general descriptions, and features 10 1. At the present the swash plate type compressor which is a kind of the. A cylinder block 4, a first swash plate 30, and a second swash plate 40 are housed in the housing chamber 24. An axial piston pump is a positive displacement pump that has a number of pistons in a circular array within a cylinder block. Furthermore, the number of pistons per barrel is higher 12 per barrel for the floating cup against 9. Variable displacement swash plate type piston pump k3vl pumps. Vibration analysis of constant power regulated swash plate.
In this paper a mathematical model for swash plate axial piston pumps with conical cylinder blocks is presented. For a given speed swash plate pumps can be of fixed displacement like this one, or variable by having a variable swash plate angle. Lownoise the unique, compact and rigid housing construction in addition to the semicylindrical pillow type swash plate and its antivibration. When the rotation of the valve is in the opposite direction to that shown in the diagram the top pistons are connected to exhaust. It has proved to be a very streamlined and robust cfd tool to run ship hull and propeller or waterjet simulations.
Part of theagriculture commons,bioresource and agricultural engineering commons, and the mechanical engineering commons. Swash plate oscillation in a variable displacement floating. 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. It can be used as a standalone pump, a hydraulic motor or an automotive air conditioning compressor. Effects of flow inertia modelling and valve plate geometry on swash plate axialpiston pump performance n p mandal, r saha, and d sanyal proceedings of the institution of mechanical engineers, part i. The pump 10 comprises a cylinder block assembly 16 which is provided with a plurality of reciprocating pistons 18. The greater the slant the further the pistons move and the more fluid they transfer. This video gives a basic understanding of working of swash plate pumps. Simulation runs are carried out using this model to evaluate the performance of a. Nov 29, 1994 a swash plate type compressor according to claim 8, said cylinder block further formed therein a pair of front and rear radially central bores, said compressor further comprising front and rear suction valves disposed in said front and rear central bores, respectively, each of said suction valves being mounted on said drive shaft for rotation. Swash plate in a singlepiston, isothermal axial piston pump. Helicopter swashplate mechanism comsol multiphysics. Dynamic highfrequency behaviour of the swash plate in a variable. A computational model of axial piston swashplate pumps.
Hydraulic pump motor division hydraulic pump basics. 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. C079, page 1 a study on the variable displacement mechanism of swash plate type compressor for automotive air conditioning system geon ho lee1, tae jin lee2 1 department of refrigeration and air conditioning, doowon technical college. Swash plate piston pump axial flow variable displacement. Based on the structure of a certain type of aviation axialpiston pumps valve plate which adopts a prepressurization. Pdf pressure compensator design for a swash plate axial piston.
In particular, the double pump with its tandem arrangement, has eliminated a power divider, has an increased transmission efficiency, and is lighter. An opposing type swash plate hydraulic pump or motor possessing not one swash plate, but instead a pair of swash plates, has been proposed in jp 50115304 a as a way to make it possible to reduce the size of a hydraulic pump or a hydraulic motor. Therefore, the decision of the products suitability to the system considered must be made by the. The basics of variable displacement pump controls crossco. A study on the variable displacement mechanism of swash plate.
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. Swash plate outlet flow can be varied by changing the shaft drive speed, or by changing the swash plate angle. Hydraulic pump motor division piston pump controls. The slipper pad is an improvement on the swash plate which provides higher pressure. K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various. A list of our surplus stock of hydraulic piston pumps piston type hydraulic pumps variable and fixed. 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. The vibration analysis of constant power regulated swash plate axial piston pumps was carried out.
Out of a wide variety of our swash plate type axial piston pumps. The simplest type of axial piston pump is the swash plate inline design figure 315. Swash plate type compressor kabushiki kaisha toyoda. Swash plate oscillation in a variable displacement floating cup pump p. A housing chamber 24 is provided in inner portions of the cylindrical case 25 and the port block 50. The following is an outline of the swash plate type compressor. Energy efficiency modeling and validation of a novel swash. The difference from previous reduced order models is the modeling of a damping mechanism not. 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. 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. The driving shaft rotates the cylinder barrel, swash plate and pistons.
Types of compressor and structure swash plate type fixed. Swashplate plate type axial piston pump noise diagnostics. The experiments have shown that the swash plate vibration has a significant effect on the displacement of the individual pistons, while commutating in and around the top and bottom dead centres. The swash plate block models a single, pistonactuated swash plate within an axialpiston pump. Pressure compensated control is the most basic control for a variable stroke piston pump. Search our piston pump stock central queensland hydraulics. 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 plate type hydrostatic pump noah denver manring iowa state university follow this and additional works at. 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. Note similarities to, and differences from, the wobble pump, radial piston pump, and bent axis pump. The k3vg pump incorporates high load bearings and a friction free contacting mechanism for the pistonshoes. Swashplate type axial piston pumps for open circuits in industrial vehicles. Hydraulic flow is developed as the pump rotating group is. Journal preproof energy efficiency modeling and validation of a novel swash platerotating type hydraulic transformer junjie zhou, chongbo jing, wei.
Pressure compensation reduced flow after reaching set pressure. An arrangement of a swash plate pump is shown in figure 6. The hydraulic motor 1 is a swash plate type hydraulic pump or motor. The study shows that the swash plate vibration needs to be included in the analysis of variable displacement axial piston pumps and motors. High efficiency and large selfpriming capability the spherical valve plate and improved hydraulic bal.
Sand or silica in particular, due to its abrasive nature, does significantly reduce the expected life of a pump. An, open loop, reduced order model is proposed for the swash plate dynamics of an axial piston pump. Ep1519006b1 swash plate type hydraulic pump or motor. A linearized model was developed and used to investigate the effect of operating parameters on. Aug 17, 1993 a doubleacting, multicylinder, swash plate type air conditioning pump 10 for propelling refrigerant gas through a cooling circuit. Closed loop swash plate type axial piston pump k8v series. In a variable displacement pump, we vary the angle of the rotating group, which is done by tilting the swash plate. Jan 08, 2017 this video gives a basic understanding of working of swash plate pumps. Pdf this work deals in particular with variable displacement. Toyota industries corporation was founded in 1926 by sakichi toyoda to manufacture and sell the automatic looms which he had invented. 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. Specications relief valve 14 pressure cutoff charge pump 15 22. 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. Pdf displacement control in variable displacement axial piston.
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. K3vls series swash plate type axial piston pump specifications, general descriptions, and features 10 1. Sand or silica in particular, due to its abnrasive nature, does signifiacntly reduce the expected life of a pump. Dynamic highfrequency behaviour of the swash plate in. Torque on the cylinder block of an axialpiston swashplate. A 75 ccrev swash plate type axial pump was modified to implement swash plate active vibration control combining a high speed direct drive servovalve, an electronic swash plate angle sensor, a. This design has resulted in a pump with high reliability and long service life. Article information, pdf download for dynamic highfrequency behaviour of the swash. Damping on the swash plate of an axial piston pump request pdf. Journal of systems and control engineering 2011 226. It has a fixed displacement axial piston assembly that delivers a given volume of fluid oil for each full rotation of the pump shaft. Us5630707a variable displacement mechanism for swash plate.
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