Swash plate oscillations due to piston forces in variable. At operating modes which were launched by position command inputs, the pump speed was varied by a pressure. A wide variety of swash plate pump options are available to you, there are 1,439 suppliers who sells swash plate pump on, mainly located in asia. Functional description of regulator load sensing and pressure cutoff 14 pressure cutoff 15 torque limiter 16. Eaton pvm piston pump service manual epuioii001e4 december 2017. Join 5,080,000 engineers with over 3,040,000 free cad files join the community. Lownoise the unique, compact and rigid housing construction in addition to the semicylindrical pillow type swash plate and its antivibration. Kassem and bahr carried out a theoretical study to determine the moment acting on the swash plate for pumps with conical. The axial piston pump type v30d is designed for open circuits in industrial hydraulics and operate according to the swash plate principle. Pump displacement is mechanically controlled by the angle of the swash plate. They are available with the option of a thrushaft for operating additional hydraulic pumps in series. Axial piston swash plate pumps can be built together with a second pump of the same or smaller size, or can be built together with one or more gear pumps or vane pumps depending on the supplier. Torque ripple attenuation for an axil piston swash plate type. Us3872775a swashplate bearings for axial piston pumps.
The pistons are connected to a shoe plate that bears against an angled swash plate. Pdf dynamic vibration analysis of a swashplate type water. Modeling and simulation of hydromechanically constant. Pdf displacement control in variable displacement axial. Analysis, design, and control offers a comprehensive mechanical analysis of hydrostatic machines and presents meticulous design. The simplest type of axial piston pump is the swash plate inline design figure 315. Torque ripple attenuation for an axil piston swash plate. Constant pressure control of a swash plate type axial piston. A spring pushes the pistons against a stationary swash plate, which sits at an angle to the cylinder. 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. Swash plate angle controls the output flow of the pump. 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. The operating pressure reaches, say, 200 bar 20 mpa or 2900 psi and the swash plate is driven towards zero angle piston stroke nearly zero and with the inherent leaks in the system allows the pump to stabilise at the delivery volume that maintains the set pressure.
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. Axial piston swash plate pumps can be built together with a second pump of the same or smaller size, or can be built together with one or more gear pumps or vane pumps. 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. Schematic diagram of an inline pump with variable swashplate angle. As a result of the preliminary tests of the piston cylinder bore mechanism of the swash plate pump operational and structural restrictions, which influence the interfaces between pump s elements, were found. A swashplate, also known as slant disk, was invented by anthony michell in 1917. The invention provides means to resist piston thrust of an axial piston rotary pump motor as applied to a tiltable rotary swash plate. Swash plate outlet flow can be varied by changing the shaft drive speed, or by changing the swash plate angle. The transfer methods of mechanical vibration and fluid pressure force. Swash plate oscillations due to piston forces in variable in. The greater the slant the further the pump pistons move and the more fluid they transfer. The axial piston pump drives a series of pistons aligned parallel with a shaft through a swashplate to pump a fluid. The main impact on the oscillations is the forces on the swash plate. The adoption of the highload bearings and friction free.
Swash plate type axial piston pumps for open circuits in industrial vehicles. The adoption of the highload bearings and friction free contacting mechanism of piston shoes, results in a high level of reliability and long life. The pump swash plate angle and pump displacement fluctuates so that differential pressure between. Movement of the swash plate controls pump output from ze.
The k3vg series swash plate type axial piston pumps are designed to specifically satisfy the industrial open circuit market where noise, efficiency, controllability and extended pump life are considered to be essential. Pump controls types three common pump control types are available. The shoeplate and the shoeplate bias spring hold the pistons against the swashplate, which is held stationary while the cylinder barrel is rotated by the prime mover. In pumping mode the position of the pump swashplate determines. Constant pressure control of a swash plate type axial. Hydraulic pump motor division if the load pressure increases, the pump outlet pressure will increase proportionately to maintain the constant pressure drop across the orifice. The k7vg series of highpressure swash plate type pumps was developed for general industrial machinery use. The model has three masses and 14 dof including outer shell and swash plate, cylinder block, piston and retaining ring as well as valve cover valve port plate and port flange. 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. Swashplate type axial piston pumps for open circuits in.
The university of cardiff axial piston pump leakage. K3vg pumps are available in nominal displacements ranging from. 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. Pdf dynamic vibration analysis of a swashplate type. Hydraulic pump motor division piston pump controls. Pdf load and stress analysis for the swash plate of an axial.
The pistons suck in fluid during half a revolution and push fluid out during the other half. An axial piston pump is a positive displacement pump that has a number of pistons in a circular. The amplitudes of the swash plate moment and flow rates in. Since the swashplate controls the output of the pistons, this pump has a variable. However, this type of valve plate has not been widely. Therefore, the decision of the products suitability to the system considered must be. Pvm piston pumps pvm018020 pvm074081 service manual. Screw spool a series variable displacement piston pumps features high efficiency. In the axial direction, the movement of the pistons is determined by the swash plate which is attached to the pump housing. The said means comprises a ring of several hydrostatic thrust pads pressurised from the pump motor working pressure via impedances and applying hydraulic pressure to an annular plate on the base of the swash plate. Noise reduction of an axial piston pump by valve plate optimization. Lubrication characteristics of the slipper swash plate interface in a swash plate type axial piston pump xiangxu meng, chang ge, hongxi liang, xiqun lu, and xuan ma proceedings of the institution of mechanical engineers, part c. 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. Oct 01, 2015 in this paper both the volumetric displacement and the shaft speed of a variable displacement swash plate type piston pump were varied in order to minimize power consumption in supplying constantpressure oil to a valvecontrolled hydraulic cylinder, particularly during idle modes.
Pulsating forces from the pistons cause torque variations on the swash plate, 5,6, 7 among others. An investigation into the swash plate vibration and pressure. Written by an expert in the field of fluid power, this book provides proven methods for analyzing, designing, and controlling highperformance axialpiston swash plate type machinery. K3vg pumps are available in nominal displacements ranging from 3. Standard manual displacement control mdc adjustment. Us3872775a swashplate bearings for axial piston pumps or. Piston motor swash plate type basic characteristics. The actuator forces from the free body diagram are derived as. K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various. Screw pumps can be built together with a gear pump or a vane pump.
Dynamic vibration analysis of a swashplate type water. On application usage of the products the operating conditions of the products shown in this catalog vary depending. Lubrication characteristics of the slipperswashplate. Gear rotor pumps are often supplied as multi pumps. The swash plate angle is controlled by the extension of the compensator plunger working against the swash plate bias spring. In bent axis axial piston pumps a shaft rotates a cylinder block with pistons, while the commutation unit and pressure ports are. Closed loop swash plate type axial piston pump k8v series. In this type, the cylinder block and drive shaft are located on the same centerline. Swash plate type axial piston pump used for open circuit applications. The transfer function relationships between the fbn and the sbn and between. A swash plate type axial piston pump improved in respect to wear or abrasionresistant capability of sliding members of the pump adapted to rotate relative to each other for protecting them from rapid wearing even upon high rotation of the pump. Xu and song optimized the structure of the precompression volume and the valveplate.
Models of the swash plate piston pumps with three fsis named full fsis and non fsi are given. Modeling and simulation of hydromechanically constant power. Optimized valve plate design for noise and pump control. Insidepenton com electronic design adobe pdf logo tiny, download this article in. In reality most systems use pressure as a control for this type of pump. The vibration of a swash plate is caused by the piston forces and the control actuator acting on the swash plate.
The force of the servo piston is greater than the force of the pumping pistons when both are at the same pressure. The swash plate angle is controlled with a lever link. The top countries of suppliers are united states, china, and south korea, from which the percentage of swash plate pump supply is. 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 inline hydraulic piston pump hydraulic pump. By varying the angle of the swashplate, the pistons stroke and, therefore, the compressors. A common example of a swashplate application in a fluid pump is the compressor of a presentday automobile air conditioning system. Vibration model and characteristic analysis of hydraulic piston pump. Due to their compact and simple design, swash plate type axial piston pumps are widely used.
Specications relief valve 14 pressure cutoff charge pump. In this version, the cylinder barrel is driven and, as a result, the pistons which are located and guided in the barrel rotate with it. As the force of the piston overcomes the driving force of the motor and the force of the spring, the face b of swash plate is pressed to the fixed face, making the swash plate tilt at a minimum angle. The influence of dynamic swash plate vibration on outlet flow. The analyzed axial piston pump is an inclined shaft type axial. Active vibrationnoise control of axial piston machine. The piston pump is the key power component in the civil aircraft hydraulic system, and the. Active vibrationnoise control of axial piston machine using. Dec 04, 2017 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 swash plate acceleration sensor, and a high speed realtime controller with the ni labview fpga. The research object is an axialpiston swash plate pump with full hydrostatic slipper bearing.
The influence of dynamic swash plate vibration on outlet. 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. Each swash plate is controlled by means of one bias piston and two control pistons or actuators. It is a mechanical engineering device used to translate the motion of a rotating shaft into reciprocating motion, or vice versa. Each swash plate can be rotated to vary the displacement of the pump. The actuator forces from the freebody diagram are derived. Since the diameter of the sensor tip is 2mm, a metal free. Pdf in an axial piston pump design, the swash plate plays an. The axial piston pump includes a housing 1, a rotatable shaft 3 supported rotatably within the housing 1, an axial piston pump including a. K3vls series swash plate type axial piston pump specifications, general descriptions, and features 10 1. The major components are the swashplate, the axial pistons with shoes, the cylinder barrel, the shoeplate, the shoeplate bias spring, and the port plate. The k3vg pump incorporates high load bearings and a friction free contacting mechanism for the pistonshoes. Gap flow simulation methods in high pressure variable. The actuators create a pure torque on the swash plate.
This file type includes high resolution graphics and schemati. An experimental analysis of valve plate control diva. One type is the standard a compensator control that limits pump outlet pressure to a desired level. The sturdy pump is particularly suitable for continuous operation in challenging applications. The object of this study is the swash plate axial piston pump. Swash plate angle is controlled by the force generated against the swash plate by the pumping pistons and by the force of the servo piston. 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. In this type, the cylinder block and drive shaft are located on the same center line the pistons are connected to a shoe plate that bears against an angled swash plate as the cylinder rotates, the pistons reciprocate because the piston shoes follow the angled surface of the swash plate swash plate type piston pump. It was originally invented to replace a crankshaft, and is one of the. The top countries of suppliers are united states, china, and south korea, from which the percentage of swash plate pump supply is 1%, 98%, and 1% respectively. Variabledisplacement pumps have emerged as an energyefficient means.
In 9, the swash plate oscillations are investigated in a. This design has resulted in a pump with high reliability and long service life. Pdf dynamic model of axial piston swashplate pump for. We choose a multipiston axial swash plate pump type wpto210 11. An earlier study of the outlet flow ripple of variabledisplacement axial piston pumps assumed a fixed swash plate angle. Multidisciplinary design optimization of a swashplate axial. On application usage of the products the operating conditions of the products shown in this catalog vary depending upon each application.
In variable displacement axial piston pumps, the angle of the swash plate can be adjusted through a movable yoke, which can be controlled manually or by servomotor or compensator. K8v series closed loop swash plate type axial piston pump specifications, general descriptions, and features 10 1. Specications relief valve 14 pressure cutoff charge pump 15 22. Pivoting the swash plate in saddle bearings changes the swash plate angle to increase or decrease the piston stroke. The overall coordinate system oxyz is set on the valve cover. Fortunately most load sense controls also incorporate a pressure limiter feature which limits the maximum pressure the pump will achieve. Presents updated analysis of the pump control problems associated with swash plate type machines showcases a successful methodology for hydraulic system design features reducedorder models and pid controllers showing control objectives of position, velocity, and effort.
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