A key component of switch-mode hydraulic circuits is a high-speed two-position three-way valve with a variable duty cycle. This paper presents a new valve architecture that consists of two valve spools that are axially driven by crank-slider mechanisms. By phase shifting the two crank links, which are on a common crankshaft, the duty cycle of the valve is adjusted. The two spools split and re-combine flow such that two switching cycles occur per revolution of the crankshaft. Because the spools move in a near-sinusoidal trajectory, the peak spool velocities are achieved at mid-stroke where the valve land transitions across the ports, resulting in short valve transition times. The spool velocity is lower during the remainder of the cycle, reducing viscous friction losses. A dynamic model is constructed of this new valve operating at 120 Hz switching frequency in a switch-mode circuit. The model is used to illustrate design trade-offs and minimize energy losses in the valve. The resulting design solution transitions to the on-state in 5% of the switching period and the combined leakage and viscous friction in the valve dissipate 1.7% of the total power at a pressure of 34.5MPa and volumetric flow rate of 22.8L/min.
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ASME/BATH 2015 Symposium on Fluid Power and Motion Control
October 12–14, 2015
Chicago, Illinois, USA
Conference Sponsors:
- Fluid Power Systems and Technology Division
ISBN:
978-0-7918-5723-6
PROCEEDINGS PAPER
Crank-Slider Spool Valve for Switch-Mode Circuits
Alexander C. Yudell,
Alexander C. Yudell
University of Minnesota, Minneapolis, MN
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Shaun E. Koktavy,
Shaun E. Koktavy
University of Minnesota, Minneapolis, MN
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James D. Van de Ven
James D. Van de Ven
University of Minnesota, Minneapolis, MN
Search for other works by this author on:
Alexander C. Yudell
University of Minnesota, Minneapolis, MN
Shaun E. Koktavy
University of Minnesota, Minneapolis, MN
James D. Van de Ven
University of Minnesota, Minneapolis, MN
Paper No:
FPMC2015-9606, V001T01A056; 9 pages
Published Online:
January 11, 2016
Citation
Yudell, AC, Koktavy, SE, & Van de Ven, JD. "Crank-Slider Spool Valve for Switch-Mode Circuits." Proceedings of the ASME/BATH 2015 Symposium on Fluid Power and Motion Control. ASME/BATH 2015 Symposium on Fluid Power and Motion Control. Chicago, Illinois, USA. October 12–14, 2015. V001T01A056. ASME. https://doi.org/10.1115/FPMC2015-9606
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