A new dynamic seven-stage model for thickness prediction of the film between valve plate and cylinder block in axial piston pumps

Zhang, Chao; Huang, Shaokang; Du, Jialu; Wang, Xingjian; Wang, Shaoping; Zhang, Haiyan

doi:10.1177/1687814016671446

Cited by 13 publications

(6 citation statements)

References 15 publications

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“…This makes it possible to calculate the relationship between each vector's space angles, the rotation angle u, the distance L, and the angle of the active force in the global coordinate system O 0 À X 0 Y 0 Z 0 . The friction force f u and sliding friction force f L along the cone roller's bus can be calculated using f = f (u, L, u) for the parameters u and L. Concurrently, the normal vector n e of the cone roller's outer surface can be obtained, as shown in equation (5).…”

Section: Mechanical Efficiencymentioning

confidence: 99%

“…[1][2][3] The hydraulic pump, located at the heart of the hydraulic system, is in charge of transforming mechanical energy into hydraulic energy by supplying the hydraulic system with exact pressure and flow of a transmission medium. 4,5 The axial piston pump is the most common of these, with three critical friction pairs: cylinder-port plate, piston-cylinder block, and slipper-swash plate. These three friction pairings limit the axial piston pump's speed and power density growth.…”

Section: Introductionmentioning

confidence: 99%

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Design and research of two-point contact type stacked roller support two-dimensional piston pump

Ruan

Zhang

Wang

et al. 2022

Advances in Mechanical Engineering

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To address the effect of clearance on the efficiency of two-dimensional piston pumps, this paper proposes a novel two-point contact type stacked roller support two-dimensional piston pump that eliminates the effect of guide rail and cone roller clearance on mechanical efficiency and volumetric efficiency in the inertia force-balance two-dimensions piston pump. It achieves two-way force balance support for the hydraulic static pressure and inertia force of the cone rollers through the overlapping mutual support and friction transmission of the double-layered cone rollers, which can effectively compensate for the gap between the rollers and the guide rail. The structure and operating principle of a two-dimensional piston pump are described first in this study, establish the mechanical efficiency model and volumetric efficiency model. Building an experimental bench for testing, the outcome is consistent with the theoretical analysis, and the difference is within 6%, demonstrating that the theoretical analysis is correct.

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Section: Mechanical Efficiencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and research of two-point contact type stacked roller support two-dimensional piston pump

Ruan

Zhang

Wang

et al. 2022

Advances in Mechanical Engineering

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“…Yamaguchi [5,6] was one of the first to measure the gap height and tipping of a barrel-like structure running on a valve plate. Other experimental research in this area has been performed by Ivantysynova and her team [3,4,[14][15][16]20], Bergada, et al [21][22][23], Wegner, et al [24,25], Shin, et al [17], Han, et al [26] and Zhang, et al [27]. Most of these studies measured a gap height between 0 and 20 µm.…”

Section: Tipping Torque Researchmentioning

confidence: 99%

Barrel tipping in axial piston pumps and motors

Achten¹,

Eggenkamp²

2017

Linköping Electronic Conference Proceedings

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In axial piston pumps and motors, the interface between the cylinder block and the port plate is one of the most complicated design details. This interface is a combination of a thrust bearing and a face sealing. The gap height, i.e. the thickness of the oil film, is only allowed to be a few micrometers. A smaller gap height results in high friction losses and possibly in metal-to-metal contact, causing wear and particle generation. On the other hand, a large gap height causes high leakage. In most cases, the barrel or cylinder block will be tipping instead of lifting, thereby causing a variable gap height and combining both high friction losses (where the gap height is small) and high volumetric losses (where the gap height is large). This paper investigates the factors that determine the barrel force and torque balance. Two axial piston pump principles are investigated and compared: a swash plate, slipper type machine and a floating cup pump/motor.

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“…Xu et al 18 derived a numerical mode of oil-film forces in piston/cylinder pair which was taking influences of roughness, elastic deformation of piston, and pressure-viscosity effect into consideration. Zhang et al 19 investigated a new dynamic seven-stage model for the thickness prediction of the film of cylinder/port plate pair in axial piston pump.…”

Section: Introductionmentioning

confidence: 99%

“…Substituting equation (20) into equation (19), the pressure distribution on the internal seal belt of port plate can be calculated as…”

mentioning

confidence: 99%

Nonlinear dynamic modeling and analysis for aviation axial piston pump in center spring return mechanism

Hang¹,

Li²,

Zhang³

et al. 2019

Journal of Low Frequency Noise, Vibration and Active Control

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Aviation axial piston pump is an important energy conversion component in aircraft hydraulic system, and the study on the nonlinearity of key operating mechanism is very necessary for improving the reliable operation of the pump. Addressing the aviation axial piston pump, this article analyzes nonlinear dynamic characteristics of the center spring return mechanism by using theoretical analysis and numerical simulation. Firstly, mathematical models of oil-film forces of slipper/swash plate pair and cylinder/port plate pair are derived. Then, based on the nonlinear dynamic theory, some specific theoretical analysis methods such as Lyapunov index spectrum, bifurcation diagram, time series, phase plane portrait, Poincaré map, and power spectrum are used to carry out the numerical simulation of nonlinear dynamic behaviors. The result indicates that characteristics of the center spring can reveal the reason for the nonlinear vibration of the center spring return mechanism. Meanwhile, the behavior of the oil thickness of slipper/swash plate pair is in the periodic and steady motion, and the variation of the oil thickness of cylinder/port plate pair is in chaotic vibration, which establishes the theoretical foundation of the aviation axial piston pump for the traceability and suppression of vibration. The obtained results are of important guidance significance for optimal design and dynamic control of the center spring return mechanism of aviation axial piston pump.

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A new dynamic seven-stage model for thickness prediction of the film between valve plate and cylinder block in axial piston pumps

Cited by 13 publications

References 15 publications

Design and research of two-point contact type stacked roller support two-dimensional piston pump

Design and research of two-point contact type stacked roller support two-dimensional piston pump

Barrel tipping in axial piston pumps and motors

Nonlinear dynamic modeling and analysis for aviation axial piston pump in center spring return mechanism

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