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impaginato corretto fullone_Layout 1 13/10/15 12.08 Pagina 27 Department of Engineering, ICT and Technologies for Energy and Transport Patent Title Title Electrohydraulic valve with linear and rotational Electrohydraulic valve with linear and rotational actuation. actuation. Ref. CNR 10227 Ref. CNR 10227 Assignee(s): CNR CNR Institute: IMAMOTER Main Inventor: Massimiliano Ruggeri Countries: IT Priority date: 02/08/2012 Abstract Abstract The invention refers to an electro-valve that consists in two mobile elements: the fist one is a cylinder moving The invention refers to an electro valve that consists in two mobile elements: the fist one is a cylinder around its axis and the second one is a spool with linear travel. The metering area of the valve is therefore moving around its axis and the second one is a spool with linear travel. The metering area of the valve is the combination of two independent movements. therefore the combination of two independent movements. The object of the invention features a metering accuracy higher than traditional implementations - The object of the invention features a metering accuracy higher than traditional implementations typically in the range of a square product. typically in the range of a square product. Since the actuation is intrinsically redundant, the valve has a high safety and reliability index and can be Since the actuation is intrinsically redundant, the valve has a high safety and reliability index and can be used to implement various metering logics, as for instance hydraulic AND and OR. used to implement various metering logics, as for instance hydraulic AND and OR. Background Background Proportional valves are used since a long time in various applications in mobile machinery and industrial Proportional valves are used since a long time in various applications in mobile machinery and industrial hydraulics. Today’s technology is based on linear actuation only seldom featuring multiple elements. hydraulics. Today’s technology is based on linear actuation only seldom featuring multiple elements. Proportional valves may be used in safety critical application only if deployed in redundant architectures and Proportional valves may be used in safety critical application only if deployed in redundant architectures and their metering edges can be optimized on one operating profile only. The invention overcomes all of these their metering edges can be optimized on one operating profile only. The invention overcomes all of these limitations. limitations. Technology Technology The valve with linear and rotational actuations is a novel application of rotary actuators; it introduces an The valve with linear and rotational actuations is a novel application of rotary actuators; it introduces an additional degree of freedom in the handling of the metering area. Two coaxial stages of the metering additional degree of freedom in the handling of the metering area. Two coaxial stages of the metering elements (cylinder and spool) feature an extremely compact implementation. elements (cylinder and spool) feature an extremely compact implementation. Advantages and Applicatons Advantages and Applications The valve features several advantages with respect to state of the art technology: the system is «Fail The valve features several advantages with respect to state of the art technology: the system is «Fail Operational» and therefore can continue functioning even in case of a single failure in actuation stages. It Operational» and therefore can continue functioning even in case of a single failure in actuation stages. It can be applied and is suited for systems like steer, fly, brake-by-wire (generally x-by-wire). The valve has a can be applied and is suited for systems like steer, fly, brake by wire (generally x by wire). The valve has a better accuracy and an increased flexibility with respect to existing technology, adapting area gains to better accuracy and an increased flexibility with respect to existing technology, adapting area gains to applications and duty cycles of different applications. applications and duty cycles of different applications. Development stage Development stage The valve is ready to be engineered and prototyped and it has been characterized in a virtual The valve is ready to be engineered and prototyped and it has been characterized in a virtual environment; it is now ready for prototype development. environment; it is now ready for prototype development. 27