Variable delivery vane oil pump, in particular for oil

Abstract

A variable delivery vane pump, in particular for oil, is provided with a stator ( 10 ) eccentrically mounted about a rotor ( 9 ), which is adapted to turn about one own longitudinal axis ( 6 ), and presents a plurality of outwardly radially open grooves ( 15 ) and slidingly engaged, each, by a respective vane ( 17 ) defined by at least two foils ( 25 ) reciprocally overlapped and slidingly coupled one to the other.

1 . A variable delivery vane pump, the pump comprising:
 a rotor said rotor being mounted to turn about a longitudinal axis said rotor presenting a plurality of grooves outwardly radially open at a surface essentially coaxial to said axis;   a stator said stator extending about the rotor, and being eccentrically mounted with respect to the rotor;   a plurality of vanes, each of said vanes being slidingly mounted inside a respective one of said groove, and presenting an outer edge facing the stator; an adjustor said adjustor selectively controlling an eccentricity between the rotor and the stator; each of said vane comprising at least two foils said foils being reciprocally overlapped and slidingly coupled one to the other.   
     
     
         2 . A pump according to  claim 1  further comprising two annular elements said annular elements being arranged on opposite bands of the rotor parallel to said axis, and extending about the axis; each of said vane axially projecting from one of said respective groove and presenting an inner edge disposed to contact said annular elements. 
     
     
         3 . A pump according to  claim 1  further comprising a sliding element arranged between the stator and an outer edges of at least one of the vanes. 
     
     
         4 . A pump according to  claim 3  further comprising a single one of said sliding element extending about said axis substantially about 360°. 
     
     
         5 . A pump according to  claim 3  further comprising a single one of said sliding element extending about said axis according to an angle smaller than 360°. 
     
     
         6 . A pump according to  claim 5 , further comprising said sliding element presenting two curved ends. 
     
     
         7 . A pump according to  claim 5 , further comprising said sliding element presenting two enlarged end edges substantially parallel to said axis. 
     
     
         8 . A pump according to  claim 3  further comprising at least two of said sliding elements distributed about said axis. 
     
     
         9 . A pump according to  claim 8 , further comprising each of said sliding elements presenting two curved ends. 
     
     
         10 . A pump according to  claim 8 , further comprising each of said sliding elements presenting two enlarged end edges substantially parallel to said axis. 
     
     
         11 . A pump according to  claim 3  further comprising each of said sliding elements being slidingly circumferentially coupled to the stator and to the vanes. 
     
     
         12 . A variable delivery vane pump, the pump comprising:
 a rotor said motor being mounted to turn about a longitudinal axis, and presenting a plurality of grooves outwardly open at surface essentially coaxial to said axis;   a stator, said stator extending about the rotor, and being eccentrically mounted with respect to the rotor;   a plurality of vanes, each of said vanes being slidingly mounted inside a respective one of said groove, and presenting an outer edge facing the stator;   an adjustor selectively controlling an eccentricity between the rotor and the stator   each vane comprising at least two foils reciprocally overlapped and slidingly coupled one to the other; and   at least one sliding element being arranged between the stator and the vanes.