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. 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 piston pump axial flow variable displacement. The simplest type of axial piston pump is the swash plate inline design figure 3 15. 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 in. This compressor consists of cylinder, piston, swash plate, shoe and valve assembly, and is. Jan 23, 1979 the inlet nozzle 18 and the swash plate 121 are located in the central portion of the lengthwise extent of the swash plate type compressor, and the compressor is constructed such that the refrigerant flows uniformly to the left and right sides of the compressor after being admitted to its interior. Kpm swash plate type axial piston pumps programs for industrial vehicles. The pump shaft rotation determines flow direction, but you only test the pump in one direction, determined by the universal dynamometer. Functional description of regulator load sensing and pressure cutoff 14 pressure cutoff 15 torque limiter 16. Models of the swash plate piston pumps with three fsis named full fsis and non fsi are given. An axial piston pump is a positive displacement pump that has a number of pistons in a circular array within a cylinder block.
A complete analysis of axial piston pump leakage and output. Swash plate type compressor for car air conditioning piston swash plate shoe. 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. Pdf an inline axialpiston swashplate pump with pressure compensator is widely used for its fast speed of. Pressure compensated control is the most basic control for a variable stroke piston pump. 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. Pvm piston pumps pvm018020 pvm074081 service manual. It has a fixed displacement axial piston assembly that delivers a given volume of fluid oil for each full rotation of the pump shaft.
The basics of variable displacement pump controls crossco. 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. 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. Pump leakage was studied for different swash plate angles and turning speeds. The greater the slant the further the pistons move and the more fluid they transfer. This model illustrates the operation of a swashplate mechanism used in helicopters to translate the input of helicopter flight control into the motion of the rotor blades, and hence controls the orientation of the rotor blades. Pressure compensation reduced flow after reaching set pressure. Vibration analysis of constant power regulated swash plate. Most of the pumps and motors in hydraulic control applications.
Swashplate pump article about swashplate pump by the. Evaluation of different compressor control concepts for a swash plate compressor. Part of theagriculture commons,bioresource and agricultural engineering commons, and the mechanical engineering commons. Pdf in this paper a mathematical model for swash plate axial piston pumps with. 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. Control of a variable displacement slippertype pump. An investigation into the swash plate vibration and pressure. Hydraulic pump motor division piston pump controls piston pump controls are integral valves that port flow to a stroking piston in response to a pressure or electronic signal, which results in a variable. F z is the corresponding force from all pistons acting on the swash plate valve plate, illustrated in. Swash plate 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. Dynamic highfrequency behaviour of the swash plate in. Therefore, the decision of the products suitability to the system considered must be made by the.
You can connect multiple swash plate blocks to multiple pistons. Torque ripple attenuation for an axil piston swash plate type. The pulsating forces on the swash plate will also create noise from mechanical vibrations. A rotary pump in which the angle between the drive shaft and the plungercarrying body is varied explanation of swashplate pump. The fixed plate is shown in gold and six shafts each take a reciprocating motion from points on the gold plate. 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. A linearized model was developed and used to investigate the effect of operating parameters on. The following is an outline of the swash plate type compressor. K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various pressure. Measurement of oil film between swash plate and shoe for. 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. Note similarities to, and differences from, the wobble pump, radial piston pump, and bent axis pump. Swash plate pumps have a rotating cylinder containing pistons. Constant pressure control of a swash plate type axial piston pump.
Pdf pressure compensator design for a swash plate axial piston. However, the principle of utilizing a finite number of displacement chambers pistons in swash plate type axial piston pumps generates oscillating forces in the. Jan 08, 2017 this video gives a basic understanding of working of swash plate pumps. K3vl pumps are available in nominal displacements ranging from 28 to 200 cm3rev with various. It was shown that the component of the moment that must be balanced by the pump. The swash plate block models a single, pistonactuated swash plate within an axialpiston pump.
The adoption of the highload bearings and frictionfree. Toyota industries corporation was founded in 1926 by sakichi toyoda to manufacture and sell the automatic looms which he had invented. The swash plate pump is a positive displacement pump. He also studied experimentally the influence of slippers with different lands, focusing on torque and leakage at different turning speeds. Out of a wide variety of our swash plate type axial piston pumps. It can be used as a standalone pump, a hydraulic motor or an automotive air conditioning compressor. Flange figure 1 pump operation in axial piston pumps, the pistons reciprocate parallel to the axis of rotation of the cylinder barrel. 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. Variable displacement swash plate type piston pump k3vl pumps. 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.
It is delivering more accurate results for our hydraulic pump and valve modeling efforts than previous cfd packages, saving us time and money. Helicopter swashplate mechanism comsol multiphysics. A constant displacement hydraulic pump uses a fixed swash plate to drive a set of pistons in and out as they revolve. Based on the structure of a certain type of aviation axialpiston pump. 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. Constant pressure control of a swash plate type axial piston pump by varying both volumetric. The swash plate of the pump is operated with a heavy spring and a piston. Swash plate in a singlepiston, isothermal axial piston pump. These pumps are commonly used in steering gear system.
The simulation results of the discharge pressures at different rotation speeds in the synthesized pump model and experiments show. At the top of their stroke, the pistons move over the inlet port and draw in fluid at low pressure. K3v280 oe00hitachi, swash plate type piston pump shp. On application usage of the products the operating conditions of the products shown in this catalog vary depending upon each application. In this dissertation, both the ideal and nonideal torque on the cylinder block of an axialpiston swash plate type hydrostatic pump are examined. A study on the variable displacement mechanism of swash plate.
Chapter 4 describes the complete set of commands of the program swash. Leakage was found to be smaller at low speeds swash plate angles, and increased with turning speed. Types of compressor and structure swash plate type fixed. Review different pump types commonly used understand the difference between centrifugal pumps and positive displacement pumps understand the working principle of the tuthill. Note the power may be coming from the shaft to drive the pistons as in a pump, or from the pistons to drive. 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. 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. 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. For a given speed swash plate pumps can be of fixed displacement like this one, or variable by having a variable swash plate angle. 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. The torque on the input shaft of an axialpiston swashplate.
In summary, positive displacement piston pumps generate a flow ripple that is created by the pumping action of the pistons and the valve in the pump. In a variable displacement pump, we vary the angle of the rotating group, which is done by tilting the swash plate. The critical speed of slipper bearings in axial piston swash. In chapter 5 some guidelines for setting up a command. 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. Catalogue msg303245uk axial piston pumps series pvplus with through drive for single and multiple pumps swash plate type for open circuit introduction technical features low noise level fast response servicefriendly high selfpriming speed compact design through drive for 100% nominal torque general information.
K3vls series swash plate type axial piston pump specifications, general descriptions, and features 10 1. A principle sketch of the rotating group and the swash plate is shown in fig. Torque on the cylinder block of an axialpiston swashplate. Downloads brochures, datasheets and drawings kpmus.
The aim of the analysis is to find the critical speed, i. 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. The forces and distances of the action point are shown in fig. 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. In 1994, kaliafetis and costopoulos 1 studied the static and dynamic characteristics of a standard variable geometric volume swash plate pump with pressure regulator.
Chapter 3 gives some remarks concerning the input and output. It is advised to read this chapter before consulting the rest of the manual. 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. The shafts might be connected to pistons in cylinders. Will adjust flow to limit the input torque demand of the pump o. Swash plate type axial piston pumps for open circuits in industrial vehicles. Pdf evaluation of different compressor control concepts. This video gives a basic understanding of working of swash plate pumps. On application usage of the products the operating conditions of the products shown in this catalog vary depending. For this type of pumps, the moment acting on the swash plate was studied theoretically by kassem and bahr 6.