Friction piece in a lubricated medium, working at contact pressures higher than 200 MPa
AssigneesH.E.F., Universite Jean Monet, Centre National De La Recherche Scientifique, Ecole Central De Lyon
InventorsPhilippe Maurin-Perrier, Florent Ledrappier, Louis Mourier, Christophe Donnet, Eric Audouard, Denis Mazuyer
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Abstract
Friction part in a lubricated medium working at contact pressures above 200 MPa and having a contact surface that is textured and subjected, before or after texturizing, to a case hardening treatment for a tribological function, wherein the surface is subjected to operations for producing a periodic network of micrometric cavities having predefined shapes and sizes and a period adapted to the width of the contact surface in order to promote passage to elastohydrodynamic lubrication regime.
Claims17
Friction part in a lubricated medium operating at contact pressures above 200 MPa and having a contact surface comprising a textured layer of deposited hard material, wherein said surface has a periodic network of micrometric cavities having a maximum length between 5 and 500 μm, a period less than half of a width of the contact surface, and a depth that is less than a thickness of said layer, correlated to a thickness of an employed lubricant so as to optimize reduction of friction coefficient and less than or equal to 3 μm, at elastohydrodynamic lubrication regime.
Friction part in a lubricated medium operating at contact pressures above 200 MPa and having a contact surface comprising a textured layer of at least one of a transition metal nitride and amorphous carbon, the layer having a thickness that does not exceed 5 μm, wherein said surface has a periodic network of micrometric cavities having a maximum length between 5 and 500 μm, a period less than half of a width of the contact surface, and a depth that is less than a thickness of said layer, correlated to a thickness of an employed lubricant so as to optimize reduction of friction coefficient, and in a range of 500 μm plus or minus 250 μm, at elastohydrodynamic lubrication regime.
Dependencies are inferred from the claim text.