Crank-slider spool valve for switch-mode circuits

Alexander C. Yudell, Shaun E. Koktavy, James D. Van De Ven

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

A key component of switch-mode hydraulic circuits is a highspeed 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 onstate 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.

Original languageEnglish (US)
Title of host publicationASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791857236
DOIs
StatePublished - 2015
EventASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015 - Chicago, United States
Duration: Oct 12 2015Oct 14 2015

Publication series

NameASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015

Other

OtherASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015
CountryUnited States
CityChicago
Period10/12/1510/14/15

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