Variable geometry fan and method for manufacturing the blades thereof
AssigneeRosati Fratelli S.R.L.
InventorsGuido Rosati, Mattia Merlin
Life of this patent
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Abstract
A fan, particularly for cooling internal combustion engines for earth moving machines, whose blades have an elastically deformable composite structure including at least one shape memory alloy foil adapted to be heated by means of electric current to vary the geometry of the blade.
Claims13
Variable geometry fan, particularly for cooling an internal combustion engine for earth moving machines, comprising a plurality of blades with variable configuration, rotatable around a rotation axis, wherein said blades each have an elastically deformable composite structure including at least one shape memory alloy foil adapted to be heated by means of electric current to vary the geometry of the blades.
Method for manufacturing a fan blade particularly for cooling an internal combustion engine for earth moving machines, comprising a plurality of blades with variable configuration, rotatable around a rotation axis, said blades each having an elastically deformable composite structure including at least one shape memory alloy foil adapted to be heated by means of electric current to vary the geometry of the blades, wherein prior to forming said composite structure, said at least one shape memory alloy foil is subjected, starting from an initial undeformed configuration, to a thermo-mechanical treatment consisting of deforming it according to a final preset configuration, heating it at an austenitic temperature and then cooling it below the final temperature of martensitic transformation, returning the foil to said initial configuration.
Dependencies are inferred from the claim text.