The following is an outline of the swash plate type compressor. The m5x series are fixed displacement axial piston motors of. The cylinder barrel in this pump is turned by the drive shaft. In such a situation it is recommended that the pump is run for a short period on a more frequent basis even if it is just unloaded. Obviously, the translational motion of the pistons is the chief cause of vibration, which is the value we want to measure and simulate. K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various.
The k3vls pumps enable flexible configuration in a wide range of applications with their compact size and light weight design. Figure 2 condition of shaft, bearings and swash plate as received. Swash plate pumps have a rotating cylinder containing pistons. You can connect multiple swash plate blocks to multiple pistons. 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. Part of theagriculture commons,bioresource and agricultural engineering commons, and the mechanical engineering commons. Figure 4 closeup of the damage to the balance weight surface. Lownoise the unique, compact and rigid housing construction in addition to the semicylindrical pillow type swashplate and its antivibration. Pressure compensated control is the most basic control for a variable stroke piston pump. Swash plate type compressor for car air conditioning piston swash plate shoe. Pvm piston pumps pvm018020 pvm074081 service manual. Figure 6 damage to the swash plate contact surface. 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. A complete analysis of axial piston pump leakage and output.
The torque on the input shaft of an axialpiston swashplate. An, open loop, reduced order model is proposed for the swash plate dynamics of an axial piston pump. The simplest type of axial piston pump is the swash plate inline design figure 315. A block diagram of the pressure control system is shown in fig. K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various pressure. Mar 16, 2016 in this paper, dynamic analyses of the swash plate vibration and pressure pulsation of an aircraft piston pump based on fluidstructure interactions fsis are presented. To use the product safely, you must carefully read all warnings and cautions in this manual. 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. Types of compressor and structure swash plate type fixed.
Hydraulic pump motor division pressure compensator pressure compensated pump will provide full pump flow at pressures below the compensator setting. Measurement of oil film between swash plate and shoe for. The controller of the hpr pump is a combination of two types of controls. Closed loop swash plate type axial piston pump k8v series. K8v series closed loop swash plate type axial piston pump specifications, general descriptions, and features 10 1. 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. The torque on the input shaft of an axialpiston swash. 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. 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. Simulation runs are carried out using this model to evaluate the performance of a. As the axial position of the pistons change, the piston chambers draw and expel fluid. The variableangle swash plate pump has been a reliable way to transmit fluid power for over 120 years.
Traditionally, the theoretical torque on the input shaft of a hydrostatic pump has been determined using a macroscopic powerin, powerout approach that neglects the timevarying aspects of this quantity and the compressibility of the hydraulic fluid within the circuit. Meaning, pronunciation, translations and examples log in dictionary. A rotary pump in which the angle between the drive shaft and the plungercarrying body is varied explanation of swash plate pump. Swash plate failures page that illustrates how and why swash plates fail. Energy efficiency modeling and validation of a novel swash platerotating type hydraulic transformer. Their use is limited to noncorrosive fluids because the working fluid also provides lubrication to the hydrodynamic bearings. Air conditioning began to become available for vehicles in the early 1950s. Swash plate inline hydraulic piston pump hydraulic pump. A spring pushes the pistons against a stationary swash plate, which sits at an angle to the cylinder.
In a variable displacement pump, we vary the angle of the rotating group, which is done by tilting the swash plate. The frigidaire f5, a five piston wobble plate configuration, used in the earliest gm vehicles with air conditioning. The simplest type of axial piston pump is the swash plate inline design. Kamakamidynamic response analysis of a swashplate type hydraulic piston pump, dynamic fracture, failure, and. The simulation results of the discharge pressures at different rotation speeds in the synthesized pump model and experiments show. An investigation into the swash plate vibration and pressure.
Models of the swash plate piston pumps with three fsis named full fsis and non fsi are given. Swash plate in a singlepiston, isothermal axial piston pump. The k3vg pump incorporates high load bearings and a friction free contacting mechanism for the pistonshoes. This compressor consists of cylinder, piston, swash plate, shoe and valve. The greater the slant the further the pump pistons move and the more fluid they transfer. A study on the variable displacement mechanism of swash plate. 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. 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. These pumps have been developed by yukens leading hydraulic engineers and provide a diverse lineup to meet a wide range of application requirements. 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. Lownoise the unique, compact and rigid housing construction in addition to the semicylindrical pillow type swash plate and its antivibration. Swashplate type axial piston pumps for open circuits in.
The pistons suck in fluid during half a revolution and push fluid out during the other half. Once the pump flow is restricted, pressure will build up to the setting of the compensator and then the pump will destroke to the level needed to maintain the compensator pressure setting. Will adjust flow to limit the input torque demand of the pump o. Efforts have been made to digitize the mechanism with feedback and electronic control, but the underlying principle has limited benefits.
Multidisciplinary design optimization of a swashplate axial. It has a fixed displacement axial piston assembly that delivers a given volume of fluid oil for each full rotation of the pump shaft. Dynamic vibration analysis of a swashplate type water. From the beginning a number of different compressor technologies have been used. An axial piston pump is a positive displacement pump that has a number of pistons in a circular array within a cylinder block. The hpr 75 02 r tl e models are selfpriming swash plate type axial piston pumps with a variable displacement volume for open loops. 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. The swash plate pump is a positive displacement pump. The earliest systems used piston compressors in various configurations. Jan 08, 2017 this video gives a basic understanding of working of swash plate pumps. The aim of the analysis is to find the critical speed, i. Simulation runs are carried out using this model to. This video gives a basic understanding of working of swash plate pumps. The adoption of the highload bearings and frictionfree.
At the top of their stroke, the pistons move over the inlet port and draw in fluid at low pressure. 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. 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. High efficiency and large selfpriming capability the spherical valve plate and improved hydraulic bal. Helicopter swashplate mechanism comsol multiphysics.
Ep1519006b1 swash plate type hydraulic pump or motor. The critical speed of slipper bearings in axial piston. A constant displacement hydraulic pump uses a fixed swash plate to drive a set of pistons in and out as they revolve. Swash plate piston pump axial flow variable displacement. The swash plate block models a single, pistonactuated swash plate within an axialpiston pump. Innovative fluid power28 helpful hints for analyzing basket cases othe last piece to fail will have the least amount of damage otry to piece together the broken parts. Toyota industries corporation was founded in 1926 by sakichi toyoda to manufacture and sell the automatic looms which he had invented. This model also accommodates extremely compact drives. 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. Axial piston machine axial piston pump or hydraulic motor with a rotating cylinder block in which the piston strokes are caused by a fixed swash plate with a largely adjustable drive angle max.
Note similarities to, and differences from, the wobble pump, radial piston pump, and bent axis pump. Basic system with hydraulic pump and hydraulic motor or cylinder. Us5630707a variable displacement mechanism for swash plate. Swashplate pump article about swashplate pump by the free. The fixed plate is shown in gold and six shafts each take a reciprocating motion from points on the gold plate. Model brochures datasheets 2d dwgs 3d cad install spares k3vl28 k3vl45 k3vl60 k3vl80 k3vl112 k3vl140 k3vl200 k3vg series. The swash plate of the pump is operated with a heavy spring and a piston. Torque on the cylinder block of an axialpiston swashplate.
Figure 3 condition of the surface of the od of the swash plate. It has very small rotating masses and therefore very short adjustment times. The accumulator pressure was regulated to supply oil to a servovalve at a reference level. Review different pump types commonly used understand the difference between centrifugal pumps and positive displacement pumps understand the working principle of the tuthill. Loadsensing control the loadsensing control of the hpr pump controls the displacement. In an ideal case, the rotation itself does not pay to vibration. 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. 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. It can be used as a standalone pump, a hydraulic motor or an automotive air conditioning compressor. Energy efficiency modeling and validation of a novel 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. 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. Pdf in this paper a mathematical model for swash plate axial piston pumps. While the valve plate is held in a fixed position, the cylinder block is driven about the. The greater the slant the further the pistons move and the more fluid they transfer. The pump shaft rotation determines flow direction, but you only test the pump in one direction, determined by the universal dynamometer. 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. This design has resulted in a pump with high reliability and long service life. Variable displacement swash plate type piston pump k3vl pumps are medium pressure, open circuit, axial piston pumps designed for mobile, industrial and marine use.
Complete with swashplate, fixed displacement, and axial piston type motors, the m2x and m5x motors are specifically designed for excavator swing operation. 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. Constant pressure control of a swash plate type axial piston pump. In a micro you are almost always going to have a 90 degree type swash. The difference from previous reduced order models is the modeling of a damping mechanism not. Movement of the swash plate in variable inline pumps at decreased displacement setting angle liselott ericson fluid and mechatronic systems, linkoping university, 581 83 linkoping liselott. In this paper a mathematical model for swash plate axial piston pumps with conical cylinder blocks is presented. 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 advantages of axial piston pumps with swash plate design is the high nominal pressure level. Power characteristics of a variable hydraulic transformer laboratory validation of swash longshore current modelling.
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. Pressure compensation reduced flow after reaching set pressure. The shafts might be connected to pistons in cylinders. Within this thesis a computational based design methodology for swash plate type axial piston pumps has been proposed. Torque ripple attenuation for an axil piston swash plate type.
Out of a wide variety of our swash plate type axial piston pumps. Swash plate in a singlepiston, isothermal axial piston. The preliminary design is based on hand calculations that are available to the general public. Specications relief valve 14 pressure cutoff charge pump 15 22. A spring pushes the pistons against a stationary swash plate, which sits at an angle to the. Swash plate pump definition and meaning collins english. In particular, the double pump with its tandem arrangement, has eliminated a power divider, has an in. K3v pump swash plate type axial piston pump k5v pump swash plate type axial piston pump kawasakis k3v series pumps, which now include tandem type with pto and parallel coniguration, are a irstchoice option for those wanting a reliable power source for their construction machines. Yuken offers low noisehigh efficiency, swash plate type variable displacement piston pumps. In particular, the double pump with its tandem arrangement, has eliminated a power divider, has an increased transmission efficiency, and is lighter. Pdf displacement control in variable displacement axial piston.
Torque ripple attenuation for an axil piston swash plate type core. The basics of variable displacement pump controls crossco. Torque on the cylinder block of an axialpiston swash. Downloads brochures, datasheets and drawings kpmus. This may seem like a waste of time but many times you will observe things which can help you determine the original cause of failure. Welcome to todays lecture on analysis of an axial piston swash plate type hydrostatic. Jan 23, 1979 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. Emitted noise is one of the biggest drawbacks of using. For a given speed swash plate pumps can be of fixed displacement like this one, or variable by having a variable swash plate angle. 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. These pumps are commonly used in steering gear system. Swash plate pump design engineering stack exchange.
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. K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various pressure, torque limiter, and a combination of load. 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. Hydraulictraining axial piston units basic principles. Pump control force steering gear pump control frequency steering gear motor control type motor driven steering gear motor control type picture brand flutekkawasaki kawasaki license vital part korea korea koreaeurope koreaeurope price 100% 95% 115% 125% merit standard design upgrade design energey saving 70% energey saving 80% eco. Damping on the swash plate of an axial piston 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. Types of compressor and structure oneway swash plate type. Besides, the authors tried to quantify the thickness of oil films and the coefficient of friction between a swash plate and a shoe for swash plate type compressors. 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. In this dissertation, both the ideal and nonideal torque on the cylinder block of an axialpiston swash plate type hydrostatic pump are examined. Damping on the swash plate of an axial piston pump request pdf.
Pressure differential between the cylinder chamber and outside the pump, was found to be of about 0. Computational design of swash plate type axial piston. The k3vls are variable displacement axial piston pumps of swash plate design, suitable for use in mobile applications and industrial vehicles with medium pressure hydraulic systems. 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. Hydraulictraining axial piston units basic principles re 9060001. Variable displacement swash plate type piston pump k3vg.
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