Theoretical analysis of tapered pistons in high speed hydraulic actuators

Meikandan, N.; Raman, R.; Singaperumal, M.; Seetharamu, K. N.

doi:10.1016/0043-1648(90)90142-w

Cited by 16 publications

(7 citation statements)

References 3 publications

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“…Friction avoidance using tapered and sealless pistons has also been employed [7,31]. This approach reduced the friction significantly but required a high hydraulic fluid flow rate.…”

Section: Discussionmentioning

confidence: 99%

“…Friction avoidance is the design of machines such that friction is reduced or avoided. Meikandan et al [7,31] looked at sealless, tapered pistons where they found that the friction would be Their initial studies were theoretical [31]. The friction in the converging-diverging piston was calculated to be one-fifth of a similar conventional piston with seals.…”

Section: Friction Avoidancementioning

confidence: 99%

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The reduction of stick-slip friction in hydraulic actuators

Owen

Croft

2003

IEEE/ASME Trans. Mechatron.

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In presenting this thesis in partial fulfilment of the requirements for an advanced degree at the University of British Columbia, I agree that the Library shall make it freely available for reference and study. I further agree that permission for extensive copying of this thesis for scholarly purposes may be granted by the head of my department or by his or her representatives. It is understood that copying or publication of this thesis for financial gain shall not be allowed without my written permission.

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“…Friction avoidance using tapered and sealless pistons has also been employed [7,31]. This approach reduced the friction significantly but required a high hydraulic fluid flow rate.…”

Section: Discussionmentioning

confidence: 99%

Section: Friction Avoidancementioning

confidence: 99%

The reduction of stick-slip friction in hydraulic actuators

Owen

Croft

2003

IEEE/ASME Trans. Mechatron.

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“…Hibi and Ichikawa 5 developed a mathematical model of the hydraulic motor studying its friction and torque characteristics during the whole operating process. Meikandan et al 6,7 studied the torque characteristic of tapered piston HAPM and investigated the friction between the casing wall and the piston on the volumetric efficiency. Dasgupta et al 8 investigated the steady-state performance of a hydraulic radial piston motor.…”

Section: Introductionmentioning

confidence: 99%

The distributed parameter model of hydraulic axial piston motor and its application in hydraulic excavator swing system

Gao

Huang

Quan

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part I:

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Hydraulic axial piston motor is one of the fundamental components in hydraulic systems; it is widely used in engineered machine, especially in high-power drive or reciprocating motion, such as hydraulic excavator. For hydraulic axial piston motor efficient planning, in addition designing and controlling are required for system operating safety and efficiency. Simulation delivers an advantage over analytical approaches and allows better understanding of the motor performance. For multi-piston hydraulic motor, one of the simulation methods, distributed parameter model, could analyze the detailed performance in each piston chamber. Therefore, in this study, we investigate the characteristics of hydraulic axial piston motor by setting up a distributed parameter model based on physical prototype, which includes mechanical–hydraulics coupling process. The effects of the dynamic pressure inside the piston chamber, the fluidic compressibility and other related parameters are considered in the coupling process. At the same time, the distributed parameter model of hydraulic axial piston motor was used in the simulation model of hydraulic excavator. The results indicate that in two-way hydraulic axial piston motor, the valve plane should adopt symmetrical structure, and silencing groove set should be put on both ends of the valve plane slots, which could reduce pressure ripple and overshoot in the piston chamber. Furthermore, the torque characteristics are highly affected by the clearance between the piston and the cylinder bore. Through this research, we may have a better understanding about the mechanism of output torque fluctuation in hydraulic axial piston motor, and the pressure ripple and overshoot in the piston chamber due to through-flow area discontinuity between the silencing groove and the ends of the valve plane slots. The model is verified using a nine-piston hydraulic motor in hydraulic excavator.

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“…When the conditions such as producing a large enough friction force and metal to metal contacts would result in control difficulty and excessive wear. Similar examples of hydrodynamic phenomena resulting from flow through very thin clearance in hydraulic machines are cam-driven radial piston pump by Backé and Rinck 11) and hydrostatic bearings in frictionless linear actuators by Viersma 12) and Meikandan et al 13) .…”

Section: Introductionmentioning

confidence: 99%

Effect of Groove Sectional Shape on the Lubrication Characteristics of Hydraulic Spool Valve

Park¹,

Hwang²

2010

Tribology Online

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The spools in most all the hydraulic spool type control valve have several circumferential grooves to prevent well known hydraulic locking problems which result in high friction force and excessive wear. In this paper, a commercial computational fluid dynamics (CFD) code, FLUENT is used to investigate the effects of groove sectional shapes and its sizes on the flow and lubrication characteristics of single grooved hydraulic spool valve. The streamlines, velocity and pressure distributions in the groove, and leakage flow through the clearance are obtained for various groove depths and sectional shapes. For shallow groove, the streamlines and leakages are highly affected by groove shapes and depths. However, for relatively deep groove, the pressure distribution and leakage are nearly uninfluenced by groove depth. It is newly found that there occurred vortices inside groove beyond a certain ratio of groove depth to width. The vortex can play as contaminants collector so contribute to reduce abrasive wear. The numerical method adopted in this paper and results can be used in optimum design of spool valves.

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Theoretical analysis of tapered pistons in high speed hydraulic actuators

Cited by 16 publications

References 3 publications

The reduction of stick-slip friction in hydraulic actuators

The reduction of stick-slip friction in hydraulic actuators

The distributed parameter model of hydraulic axial piston motor and its application in hydraulic excavator swing system

Effect of Groove Sectional Shape on the Lubrication Characteristics of Hydraulic Spool Valve

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