Downloads brochures, datasheets and drawings kpmus. Closed loop swash plate type axial piston pump k8v series. Electrically controlled swash plate axial piston pumps with conical cylinder blocks are recently used in the industry in view of their superior performance. 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. Note similarities to, and differences from, the wobble pump, radial piston pump, and bent axis pump. Swash plate piston pump axial flow variable displacement.
The greater the slant the further the pistons move and the more fluid they transfer. A complete analysis of axial piston pump leakage and output flow ripples. Torque on the cylinder block of an axialpiston swashplate. Types of compressor and structure oneway swash plate type. A linearized model was developed and used to investigate the effect of operating parameters on. 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. Mar 18, 1986 a swash plate axial piston pump of this type is described and represented in german auslegeschrift no. 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. These pumps are commonly used in steering gear system. 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. In the case of this known axial piston pump, the retraction plate is supported on a spherical head and is fixed in the direction of the feed movement of the pistons by means of an arrangement which is specifically provided for that. The advantages of axial piston pumps with swash plate design is the high nominal pressure level, variability of the displacement, beneficial efficiencies, through. Hydraulic axialpiston pump with loadsensing and pressure.
An axial piston pump is a positive displacement pump that has a number of pistons in a circular array within a cylinder block. This video gives a basic understanding of working of swash plate pumps. The improved valve assembly of swash plate compressor for vehicle air conditioning system. 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 swash plate pump is a positive displacement pump. Pdf an inline axialpiston swashplate pump with pressure compensator is widely. Several studies have been carried out to study the characteristics of such novel pump mechanism. The control torque on the swash plate of an axialpiston pump. Variable displacement axial piston pumps swash plate design ideally suited for medium and. 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. A common example of a swashplate application in a fluid pump is the compressor of a presentday automobile air conditioning system. Swash plate axial piston pump hydraulic piston pumps.
Sand or silica in particular, due to its abnrasive nature, does signifiacntly reduce the expected life of a pump. The swash plate block models a single, piston actuated swash plate within an axial piston pump. Axial piston pumps in swash plate and bent axis design are intended for the medium and high pressure range. Swash plate oscillations due to piston forces in variable in.
It has proved to be a very streamlined and robust cfd tool to run ship hull and propeller or waterjet simulations. Hydraulictraining axial piston units basic principles. Axial piston units title index open circuit the way to the complete hydraulic system. The variableangle swash plate pump has been a reliable way to transmit fluid power for over 120 years. 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. A spring pushes the pistons against a stationary swash plate, which sits at an angle to the cylinder. The vibration analysis of constant power regulated swash plate axial piston pumps was carried out. Following is a list of some of the traditional techniques or sort of guiding principles used by the pump industry to reduce the noise level of axial piston pumps. It has a fixed displacement axial piston assembly that delivers a given volume of fluid oil for each full rotation of the pump shaft. By varying the angle of the swashplate, the pistons stroke and, therefore, the compressors. For a given speed swash plate pumps can be of fixed displacement like this one, or variable by having a variable swash plate angle.
However, due to special design of vdaapp valve plate, the swash plate torque severely limits system dynamic response. Pdf in this paper a mathematical model for swash plate axial piston pumps with conical cylinder blocks is presented. A complete analysis of axial piston pump leakage and output. Variable displacement swash plate type piston pump k3vl pumps are medium pressure, open circuit, axial piston pumps designed for mobile, industrial and marine use. Operate in stroke of mobile machines harvesters, concrete mixers, paving. It has an adjustable swash plate thats adjusted by loosening a nut, and a clamp that you can see sticking out on the side at the end of the pump. Model brochures datasheets 2d dwgs 3d cad install spares k3vl28 k3vl45 k3vl60 k3vl80 k3vl112 k3vl140 k3vl200 k3vg series.
Article information, pdf download for a novel method to design pressure. Aug 26, 2004 0023 with reference to the figures, an oscillating swash plate for axial piston pumps according to the invention is generally designated by the reference numeral 10. Swash plate in a singlepiston, isothermal axial piston pump. Simulation runs are carried out using this model to evaluate the performance of a. 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. Variable displacement axialpiston pumps in swashplate design are intended for. Pumping mechanism of swash plate axial piston pump with conical cylinder block. Swash plate type axial piston pumps for open circuits in industrial vehicles.
The directional control valve allows reversal of the direction of rotation or of movement at the user. The adoption of the highload bearings and frictionfree. A novel method to design pressure compensator for variable. Vibration analysis of constant power regulated swash plate. 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. In this paper a mathematical model for swash plate axial piston pumps with conical cylinder blocks is presented. Axial piston pumps have a circular piston group which rotates against an angled swash plate.
K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various. Hydraulic pump motor division piston pump controls piston pump controls are integral valves that port. Constant pressure control of a swash plate type axial piston. Auxiliary pumps for the boost and pilot oil circuit or a further axial piston pump of up to the same size can be mounted to the throughdrive. 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. Part of theagriculture commons,bioresource and agricultural engineering commons, and the mechanical engineering commons.
The pump shaft rotation determines flow direction, but you only test the pump in one direction, determined by the universal dynamometer. Axial piston variable displacement pumps, series 20, are of swash plate construction with variable flow capatibility suitable for hydrostatic transmissions with closed circuit. Modeling of swash plate axial piston pumps with conical. Numerous variations in the designs, performance ranges, and adjustment options offer ideal solutions for mobile and stationary applications. Download the bosch rexroth electrohydraulic pressure control. Toyota industries corporation was founded in 1926 by sakichi toyoda to manufacture and sell the automatic looms which he had invented. Design and analysis of a swashplate control system for an. Swash plate pumps have a rotating cylinder containing pistons. Efforts have been made to digitize the mechanism with feedback and electronic control, but the underlying principle has limited benefits. Specications relief valve 14 pressure cutoff charge pump 15 22.
Kpm swash plate type axial piston pumps programs for industrial vehicles. Pump displacement is controlled by altering the angle of the swash plate. Torque on the cylinder block of an axial piston swash plate type hydrostatic pump noah denver manring iowa state university follow this and additional works at. Jan 08, 2017 this video gives a basic understanding of working of swash plate pumps.
K8v series closed loop swash plate type axial piston pump specifications, general descriptions, and features 10 1. Variable displacement swash plate type piston pump k3vg pumps are high. Torque ripple attenuation for an axil piston swash plate type core. The wear of particular pump elements most often leads to a decrease in the operational pump pressure and an increase in volumetric losses, thus in consequence it reduces the general pump e. 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. Pdf pressure compensator design for a swash plate axial piston.
The fluid viscosity range for optimal use of mvp pump is betwe. Swash plate oscillations due to piston forces in variable inline pumps. As the rotary group turns the pistons are pushed forwards and backwards. Article pdf available in journal of dynamic systems measurement and control 62. A grooved timing plate at the at the top of the pistons controls the way the fluid is drawn through the suction side of the pump and out through the pressure side. It can be used as a standalone pump, a hydraulic motor or an automotive air conditioning compressor. Our digital displacement pump technology is a natively digital hydraulic innovation. An alternative form of axial piston pump is the bent axis pump of figure 2. The axial piston pump drives a series of pistons aligned parallel with a shaft through a swashplate to pump a fluid.