Relevant bibliographies by topics / Digital Radial Piston Pump

Academic literature on the topic 'Digital Radial Piston Pump'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Digital Radial Piston Pump"

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Tao, Jing, Huaiyu Wang, Haohan Liao, and Suiran Yu. "Mechanical design and numerical simulation of digital-displacement radial piston pump for multi-megawatt wind turbine drivetrain." Renewable Energy 143 (December 2019): 995–1009. http://dx.doi.org/10.1016/j.renene.2019.04.159.

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Nordås, Sondre, Michael M. Beck, Morten K. Ebbesen, and Torben O. Andersen. "Dynamic Response of a Digital Displacement Motor Operating with Various Displacement Strategies." Energies 12, no. 9 (May 8, 2019): 1737. http://dx.doi.org/10.3390/en12091737.

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Digital displacement technology has the potential of revolutionizing the performance of hydraulic piston pumps and motors. Instead of connecting each cylinder chamber to high and low pressure in conjunction with the shaft position, two electrically-controlled on/off valves are connected to each chamber. This allows for individual cylinder chamber control. Variable displacement can be achieved by using different displacement strategies, like for example the full stroke, partial stroke, or sequential partial stroke displacement strategy. Each displacement strategy has its transient and steady-state characteristics. This paper provides a detailed simulation analysis of the transient and steady-state response of a digital displacement motor running with various displacement strategies. The non-linear digital displacement motor model is verified by experimental work on a radial piston motor.
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Jasiński, Ryszard. "Research of Hydrotronic Variable-Displacement Radial Piston Pump with Electro-Pneumatic Control." Solid State Phenomena 164 (June 2010): 37–40. http://dx.doi.org/10.4028/www.scientific.net/ssp.164.37.

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The paper presents the developed new electro-pneumatic control (pneumotronic) system for hydraulic fixed-displacement radial piston pump. Hydraulic fixed-displacement radial piston pump equipped with the proposed control system changes into hydrotronic variable-displacement radial piston pump. Pump flow rate control is realized by means of programmable logic controller, electro-pneumatic valves, pneumatic cylinders and a sensor.
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Guo, Tong, Shengdun Zhao, and Chen Liu. "Study on flow characteristics and flow ripple reduction schemes of spool valves distributed radial piston pump." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 12 (February 6, 2016): 2291–301. http://dx.doi.org/10.1177/0954406216630570.

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This paper studies the flow characteristics and flow ripple reduction techniques of a spool valves distributed radial piston pump. The mathematical models of the pump are established, and simulations based on the mathematics are performed in AMESim environment. The results indicate that the spool valves distributed radial piston pump has fewer flow fluctuations than the pump distributed by check valves, due to the rigid motion of its distribution component—the spool valves. Then, in order to reduce the flow ripple of the spool valves distributed radial piston pump, three techniques, namely, time delay, relief chamfer and transition compression filter volume, are proposed and their working principles are illustrated. Particularly, the design method of time delay is elaborated and its effectiveness is evaluated. The simulation results suggest that with the usage of the time delay method, the fluctuation range of the spool valves distributed radial piston pump is expected to be reduced by 21.7%.
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Dong, Peng, Shengdun Zhao, Shuqin Fan, Muzhi Zhu, and Peng Zhang. "Double-rotator and valve plate distribution radial piston pump." Assembly Automation 40, no. 2 (November 3, 2019): 265–71. http://dx.doi.org/10.1108/aa-12-2018-0270.

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Purpose The drive shaft and the distribution shaft of a traditional radial piston pump are in a cantilever state. To solve this problem, this paper aims to present a radial piston pump with through shaft driving and valve plate distribution. Design/methodology/approach The working principle of the pump is discussed in detail. In this radial piston pump, valve plate distribution parts are designed to distribute oil to the piston chambers, and the distribution shaft is replaced. A bearing is installed between the stator and rotator to reduce the friction. The transmission shaft is supported by two bearings to ensure smooth operation. The support force of the transmission shaft is optimized. In addition, the flow pulsation principle is presented. To accomplish the change, the displacement of the radial piston pump, the proportional control system is designed. Findings After completing the machining and assembly of the pump, an experimental study was carried out. The results show that the output flow of the pump is basically the same as the theoretical flow. Originality/value The friction between the slipping shoes and the stator is greatly reduced due to the function of rolling bearings. The higher stability of the driveshaft is obtained for the reason of double-sided support. The radial piston pump has a novel structural design in reducing the friction between the shoes and the stator and improving the stability of the transmission shaft.
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Cai, Han Ming, and Ming Jie Tian. "Design of a Shaft Assignment Radial Piston Pump." Advanced Materials Research 510 (April 2012): 9–12. http://dx.doi.org/10.4028/www.scientific.net/amr.510.9.

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This paper introduces a kind of shaft structure improvement after assignment radial piston pump, its structure and working principle to improve the axial flow past with radial piston pump shaft with flow the stress of the situation, and improve the hydraulic pump pressure of work and service life.
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MUKAI, Hiroshi. "Basic study on Variable Displacement Radial Piston Pump." Proceedings of Mechanical Engineering Congress, Japan 2016 (2016): S1120203. http://dx.doi.org/10.1299/jsmemecj.2016.s1120203.

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Nizhegorodov, A. I., A. N. Gavrilin, B. B. Moyzes, A. I. Cherkasov, O. M. Zharkevich, G. S. Zhetessova, and N. A. Savelyeva. "Radial-piston pump for drive of test machines." IOP Conference Series: Materials Science and Engineering 289 (January 2018): 012014. http://dx.doi.org/10.1088/1757-899x/289/1/012014.

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Zhou, Tian Yue. "Research on Velocity Vibration Characteristics of Stator of Radial Piston Pump in Time Domain." Advanced Materials Research 681 (April 2013): 229–33. http://dx.doi.org/10.4028/www.scientific.net/amr.681.229.

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The working mode of constant-pressure radial piston pump includes the mode of constant flow and constant pressure. The dynamic model of stator vibration was established and the analysis was made on the stator vibrating velocity in time domain to the two modes. Measurement mechanism was designed to test the vibration of stator of JB32H-type radial piston pump. It is concluded from the analysis and test results that the velocity of stator vibrates periodically on the two modes. The maximum amplitude on the mode of constant pressure is smaller than the one on the mode of constant flow. The conclusions are helpful to the noise control of piston pump.
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Jiang, Wei, X. G. Qiu, Guo Zhong Chai, and Jian Xing Zhou. "Research of the Pressure Pulsation within Piston Chamber in Radial Piston Pump." Advanced Materials Research 69-70 (May 2009): 626–30. http://dx.doi.org/10.4028/www.scientific.net/amr.69-70.626.

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Noise reduction in piston pumps has been being the focus research. Many methods have been designed to smooth it. Research shows that noise takes place at the time when pistons enter the discharge port or enter the suction port. In fact, noise is induced by imbalance pressure in piston chamber. In this paper, piston initial volume and instantaneous controlled volume are deduced. Equations describing pressure angle-rate-of-change are also deduced. Keep the pressure increment equal when the pump eccentric distance is maximum and minimum, and then find out the optimal structure parameters. The parameters makes the pressure ripple minimize and makes the lowest noise.
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Dissertations / Theses on the topic "Digital Radial Piston Pump"

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Rampen, William Hugh Salvin. "The digital displacement hydraulic piston pump." Thesis, University of Edinburgh, 1992. http://hdl.handle.net/1842/12829.

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The digital displacement hydraulic piston pump is a hybrid device which combines a microcompressor with an established form of high-pressure pump to create a highly integrated machine which can produce a variable high-power output directly from an electronic command. The actively controlled inlet poppet-valve in each cylinder can be held open against the discharging flow in order to disable it during a single cycle. Cylinders can be disabled in this manner, following a maximally smooth sequence, allowing a controlled output flow to be achieved. A compliant device located near the pump, such as an accumulator, provides time-averaging of the flow pulsations in order to minimise the effects of the quantisation error caused by cylinder disabling. The advantages of this approach over the conventional variable-swash axial piston pump lie with both the response speed and the inherent energy efficiency of real-time cylinder selection. Disabling cylinders in this way restricts parasitic losses to very low levels since unused cylinders are not pressurised nor do they incur loads on their associated bearings. The response time of the pump is related to shaft speed, with the pump able to attain either full or zero output from any starting condition, in less than a single shaft revolution. At induction motor speeds this allows large-signal response times of the same order as those achieved by commercial proportional valves. The thesis chronicles the development of the Digital Displacement pump. It begins with the formulation of a simulation model which is able to predict the behaviour of the machine in both flow and pressure control modes. The valve control possibilities are then explored and the design of active valve latches using finite-element analysis described. The sinusoidal flow forces on the disabled poppet are evaluated through a large range of experiments and the results condensed into parametric equations useful for predicting the valve latching requirements of most machines. The mechanical and electronic hardware design, leading to the construction of the prototype, is then discussed.
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Michael, Paul W., and Shreya Mettakadapa. "Bulk Modulus and Traction Effects in an Axial Piston Pump and a Radial Piston Motor." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200173.

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This paper describes an investigation into the effects of fluid bulk modulus and traction coefficient properties on piston pump flow losses and radial pison motor torque losses through experimentation, modelling and simulation. Synthetic ester, high bulk modulus, multi-grade, and single grade mineral oils were evaluated. The high bulk modulus fluid exhibited 20% lower pump case and compensator flow losses than a conventional mineral oil of the same viscosity grade. Low traction coefficient fluids reduced the lowspeed torque losses of the radial piston motor by 50%. Physical models for pump case flow and motor torque losses were derived from the experimental data. Field data was collected from a hydraulically propelled agricultural machine. This data was used to model fluid performance in the machine. The simulation results predict that at an operating temperature of 80⁰C, optimizing the bulk modulus and traction coefficients of the fluid could reduce flow losses by 18% and torque losses by 5%. These findings demonstrate the potential of combining comprehensive fluid analysis with modeling and simulation to optimize fluids for the efficient transmission of power.
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Book chapters on the topic "Digital Radial Piston Pump"

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Kozyrskyi, Volodymyr, Andrii Petrenko, Mykola Trehub, and Yangibay Charyev. "The Exploitation of Wind Systems in Rural Electrical Network." In Advances in Computer and Electrical Engineering, 197–228. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-9179-5.ch009.

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The activity of farm enterprises is directly connected with the efficient use of resources such as electrical energy and water. Taking such conditions as factors of economic expediency and ecological safety into account, it is more reasonable to use wind stations in order to provide consumers with energy and water. The use of conventional wind and electrical stations is an easy and reliable solution. However, annual wind velocity on most settled territories does not exceed 6 m/s or even 4 m/s. It makes the efficient use of wind electrical stations more complicated. One of the solutions can probably be the use of wind and electrical stations on the basis of slow speed non-transmission arc-shaped-stator inductor-type generators with an integrated radial and ring-shaped rotor. Another efficient solution to provide areas with water and electrical energy is to use a combined wind station with a crank-and-rod mechanism and the rod of the driving mechanism of the back-and-forth motion of the core of a magnetic and electrical linear generator and the piston of a plunger pump.
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Conference papers on the topic "Digital Radial Piston Pump"

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Darnet, Justin, and Éric Bideaux. "State-of-the-art of Variable Displacement Technologies for Radial Piston Hydraulic Machines." In BATH/ASME 2022 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/fpmc2022-90598.

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Abstract The hydraulic motor is one of the main parts of hydrostatic transmission implemented in some off-road vehicles for instance. It uses hydraulic power to convey energy from the generator of the machine to the wheels and other actuators. As the hydraulic circuit may contain several hydraulic actuators, each of them needs to be controlled independently since the only control of the pump displacement may impact the entire circuit and all its actuators simultaneously. To properly drive the vehicle, the hydraulic actuators have to be accurately controlled. This paper aims to present a state-of-the-art of the different ways of changing hydraulic pumps/motors displacement ratios because it is one of the most important parameter to control the torque/speed (resp. pressure/flow rate). Some hydraulic machines enable a continuous change of this displacement ratio thanks to their specific architectures, whereas other machines use hydraulic valves to pilot this ratio. Most of the technologies, from variable displacement axial solutions to new digitally modulated displacement machines will be presented and compared. Digital Displacement solutions and their valve timing control solutions will then be depicted. Finally, technological locks in Digital Displacement will be exposed based on the modeling of a radial piston motor.
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Johansen, Per, Daniel B. Roemer, Torben O. Andersen, and Henrik C. Pedersen. "On the Influence of Piston and Cylinder Density in Tribodynamics of a Radial Piston Digital Fluid Power Displacement Motor." In ASME/BATH 2015 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/fpmc2015-9608.

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In the past three decades an increasing amount of research has been performed in the field of tribodynamics of fluid power pumps and motors. The main incentives for this research are optimization of reliability and efficiency through the study of loss and wear mechanisms. These mechanisms are very difficult to study experimentally, whereby modeling and simulation are necessary. The modeling of tribodynamics is a multiphysics problem involving multibody dynamics, fluid mechanics, thermodynamics and solid mechanics. Consequently, the simulation durations can easily become impractical for parametric analysis or optimization. The coupling between multibody dynamics and fluid mechanics depend on the formulation of the solid body motion equations, where two approaches have historically been used. One approach is where the external forces on any lubricated joint are balanced by the fluid forces, such that solid body inertia is neglected. The other approach includes the inertia terms in the calculation of microdynamics. The inclusion of inertia terms entails a need for smaller time steps in comparison to the force balance approach, wherefore it is of interest to analyze the influence of the inertia term. In this paper the influence of the inertia term on the lubrication gaps of a radial piston motor are studied by a parametric analysis of the piston and cylinder density in a multibody tribodynamic simulation model. The motor is modeled as a digital fluid power displacement machine and a series of full-stroke displacement simulations are used as basis for the parametric analysis. From the parametric analysis a change, in the minimum film thickness as function of piston and cylinder density, is shown for certain operating modes of the digital fluid power displacement motor. This indicate a need for careful assessment of the applicability, of the force balance condition, if it is used in multibody tribodynamic simulations of radial piston digital fluid power displacement motors.
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Dumnov, Daniil, and Niall Caldwell. "A Cylinder Enabling Algorithm for Reduction in Low Frequency Pulsation From Digital Displacement Pumps." In BATH/ASME 2022 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/fpmc2022-88893.

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Abstract Digital Displacement® hydraulic pumps are a type of radial-piston machine with solenoid operated on/off valves used to individually control the pressurization of each cylinder on a stroke-by-stroke basis, thus adjusting the pump’s overall displacement. Previously developed cylinder enabling strategies based on using full strokes can lead to low frequency vibration, whereas partial stroke strategies pose challenges in audible noise and component lifetime. A new enabling algorithm is proposed, Quantized Part Stroke (QPS), which seeks to minimize the low frequency content in the pump output, as well as limiting noise due to actuating the valve near mid-stroke. The operating displacement fraction is quantized such that only integer fractions of displacement are permitted, the fraction’s denominator relating directly to a minimum allowable frequency in the pump output. This quantization is applied such that the chosen displacement fraction is higher than the demand and then part strokes are used to exactly achieve the desired flow. Simulation results are presented comparing this algorithm with well-known alternatives, as well as test data from a 12-cylinder pump showing a clear decrease in low frequency pulsation in the hydraulic system pressure, without a significant change in audible noise from the pump.
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Chapple, Peter, Per N. Lindholdt, and Henrik B. Larsen. "An Approach to Digital Distributor Valves in Low Speed Pumps and Motors." In ASME/BATH 2014 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fpmc2014-7861.

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This paper presents a novel approach to digital pumps and motors with electronic controlled valves for each working chamber in positive displacement machines. The approach is focused on low speed operation of hydraulic pumps and motors. When applied to High Torque Low Speed radial piston units with eccentric shaft it offers increased efficiency, increased power capacity, more compact design, displacement control and a number of other control features. The proposed valve system has out-wards opening poppet-type valves on both the high- and low pressure side. This solution allows for a symmetric valve arrangement, enabling the units to operate as traditional motors/pumps with traditional distributor valves as well as to be used in simplified system layouts where full advantage is taken of the technology. This is opposed to current solutions having poppet type valves opening inwards on the low-pressure side and outwards on the high-pressure side, requiring dedicated high- and low pressure ports, also on motors. New opportunities and challenges are discussed, among which are four quadrant operation, displacement variation, start and stop, valve timing, overpressure protection and valve actuators.
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Xu, Yang-Zeng, and Gen-Xi Li. "Producing Hydraulic Radial Piston Pump by Integrated CAD/CAM Technique." In International Off-Highway & Powerplant Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1991. http://dx.doi.org/10.4271/911868.

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Nahin, Md Minal, Garrett R. Bohach, F. N. U. Nishanth, Eric L. Severson, and James D. Van de Ven. "Dynamic Modeling and Design of a Radial Hydrostatic Piston Pump for Integrated Pump-Motor." In ASME/BATH 2021 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/fpmc2021-68788.

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Abstract There is a current trend towards the electrification of high force/torque density machines that have traditionally been dominated by diesel engine driven hydraulics. Power dense electric machines tend to favor high operating speeds whereas a hydraulic pump is more efficient at low speed and high torque conditions. The power density of a pump can be increased by decreasing the displacement and increasing the operating speed to provide the flow demand. This miniaturization of the pump allows it to be directly integrated into an electric motor inside a single casing. This integrated pump-motor is free of shaft seals and eliminates a set of bearings otherwise required when coupling an electric motor and pump with a shaft. Additionally, the leakage from the hydraulic pump can be used as coolant for the electrical machine, thereby improving the power density. In this paper, a hydrostatic radial piston pump has been evaluated for integration with an axial flux PM machine. The proposed hydrostatic piston pump uses a spherical head piston that can tilt while reciprocating inside the cylinder, eliminating the need for a joint at the slipper. To reduce the frictional loss between the slipper pad and the cam at high operating speeds, the cam freely rotates. A detailed model of the pump, with focus on the hydrostatic piston slipper, has been developed and a grid search approach has been utilized to select the critical parameters of the pump. Finally, an efficiency map has been presented for this pump at different operating conditions which shows around 86% efficiency at the 12500 rpm speed for 7 MPa pressure differentials.
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Mehta, Viral S., and Noah D. Manring. "Piston Pump Noise Attenuation Through Modification of Piston Travel Trajectory." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37394.

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Piston pumps are widely used in industrial and mobile applications to transmit power. These pumps emit loud and objectionable noise when operated at high pressure and high speeds. It is generally accepted that large amplitude of flow ripple causes pumps to produce unacceptable noise level. The flow ripple could be thought of composed of two components — a kinematic component resulting out of periodic nature of flow and a dynamic component resulting due to compression and decompression of fluid. There has been considerable research activity to reduce the noise induced by the dynamic component however very little is done to attenuate the noise generated due to the periodic nature of flow. This research investigated one method to reduce noise associated with kinematic component for axial and radial type piston pumps. A theoretical analysis is presented deriving the equations defining the motion of pistons on their regular trajectory as well as their modified trajectory. It is shown here that by altering the trajectory of the piston travel the amplitude of the kinematic flow component could be reduced by up to 85% in some conditions. While effectiveness of the techniques aimed at reducing the dynamic flow component are speed and pressure dependent, the techniques presented here work with same effectiveness throughout the entire spectrum of speed and pressure towards reducing the noise.
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Dong, Peng, Shengdun Zhao, Yongfei Wang, Peng Zhang, Xiaolan Han, Chen Liu, Dean Meng, and Yuanzhe Dong. "Design and Experimental Study of Radial Piston Pump With Valve Plate Distribution." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11286.

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Abstract In the field of forging machinery and construction machinery, the hydraulic transmission has become the preferred transmission mode for its high efficiency. The hydraulic pump is the core component of the transmission system as the power component. It is also the main research focus in the field of hydraulic transmission in recent years. According to the axis direction of the piston and the drive shaft, the piston pump can be grouped into radial piston pump and axial piston pump. There are two shafts in the conventional radial piston pumps, which are distribution shaft and drive shaft to complete distribution the pump and transmission work, and the friction between the shoes and the stator is high for its high load and relative sliding speed. In order to reduce the impact of these drawbacks on pump performance, a valve plate is designed to distribute the oil to avoid the stress of the conventional distribution shaft in this paper. The working principle of the radial piston pump is discussed. An electro-hydraulic proportional servo control system was adopted to control the displacement of the pump. The design and manufacturing of the radial piston pump were completed. A test platform is carried out to test the performance and the variable displacement control system of the radial piston pump with a good test result. The radial piston pump has a certain novelty in structure and has practical value.
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Qiu, Xinguo, Libin Chen, and Wei Jiang. "Simulation of the Flow Control of Radial Piston Pump Based on Simulink." In 2010 2nd International Conference on Information Engineering and Computer Science (ICIECS). IEEE, 2010. http://dx.doi.org/10.1109/iciecs.2010.5678140.

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Wang, Sanwu, Wenkai Ou, Yuandong Qiu, Jiang Wu, and Yaodeng Fan. "Research of the radial piston pump shaft dynamic balance and structure improvement." In 2016 IEEE 11th Conference on Industrial Electronics and Applications (ICIEA). IEEE, 2016. http://dx.doi.org/10.1109/iciea.2016.7603594.

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