Development of 5–Port Type Low–Cost Servo Valve Using Buckled Tubes

Hideyuki Obayashi, Tetsuya Akagi, Shujiro Dohta, Wataru Kobayashi, and Shota Harada
Okayama University of Science, Okayama, Japan
Abstract— Recently, wearable actuator for work assistance and rehabilitation, such as power assist suit, have received much attentions and studies have been done actively. In this study, the final target is to develop a low-cost home rehabilitation device driven by fluidic actuator using low-cost servo valve. In the device, the size and cost of control valves become serious concerns. In the previous study, a low-cost 3-port servo valve that was able to control the flow rate by changing the bending angle of the buckled tube was proposed and tested. In this paper, to drive a double acting type pneumatic cylinder by using one valve, 5-port type servo valve using bucked tubes is proposed and tested. To design the valve, the relation between the buckled tube length or buckled point and output flow rate of the valve is investigated. In addition, the position control system of the pneumatic cylinder using the tested valve is proposed and tested. Multi- position control of the cylinder is carried out. From the result, it can be confirmed that the tested valve can control the double acting type cylinder and the position control system is validated. 

Index Terms—servo valve using buckled tubes, control valve, 5-port type servo valve, position control

Cite: Hideyuki Obayashi, Tetsuya Akagi, Shujiro Dohta, Wataru Kobayashi, and Shota Harada, "Development of 5–Port Type Low–Cost Servo Valve Using Buckled Tubes," International Journal of Mechanical Engineering and Robotics Research, Vol. 7, No. 6, pp. 669-673, November 2018. DOI: 10.18178/ijmerr.7.6.669-673
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