Fan assembly for vehicles

Abstract

A fan assembly includes a shroud having a through opening, around which the shroud defines an air conveying ring, a motor-fan assembly which includes an axial fan rotatable with respect to the support about an axis of rotation, and a noise-reducing annular structure, having a plurality of projections which are arranged in succession in a circumferential direction and extend radially towards the axis of rotation of the fan, each projection having a face which is directed towards the axis of rotation and is substantially parallel thereto, and a plurality of portions radially recessed towards the air conveying ring.

1 . A fan assembly for cooling a radiator, a radiator-condenser assembly, or a radiator-condenser-intercooler assembly of a vehicle, comprising:
 a shroud, having a through opening around which said shroud defines an air conveying ring, and a support which is located at the centre of said opening;   a motor-fan assembly carried by said support, which includes an axial fan rotatable with respect to said support about an axis of rotation; and   a noise reducing ring structure, fixed with respect to the air conveying ring and surrounding said fan, said ring structure having
 a plurality of projections that follow one another in a circumferential direction and extend radially toward the axis of rotation of the fan, each projection having a face bounded by side edges in the circumferential direction, which faces toward said axis of rotation and is substantially parallel thereto, and 
 a plurality of recessed portions radially recessed toward the air conveying ring and alternated with said projections, 
 wherein each of said recessed portions has a face facing toward the axis of rotation of the fan, whose profile in axial direction is generally curvilinear and unparallel to said axis of rotation, 
 wherein said ring structure is provided with a plurality of first and second ledge formations which follow one another along the circumferential direction, each of which having a substantially quadrilateral, straight or arcuate, top side, and extending in axial direction to a bottom wall of the air conveying ring, and in radial direction from a side wall of the air conveying ring, the second ledge formations projecting radially toward the axis of rotation of the fan by a greater extent than the first ledge formations, 
 wherein the air conveying ring has radially inner faces directly facing toward said axis of rotation, and 
 wherein said second ledge formations constitute said projections and said first ledge formations and said radially inner faces of the air conveying ring constitute said recessed portions. 
   
     
     
         2 . The fan assembly according to  claim 1 , wherein said ring structure has a plurality of ring structure portions radially spaced from a side wall of the air conveying ring, which cooperate with said side wall for forming corresponding pockets opened axially toward the air inlet side of the fan assembly. 
     
     
         3 . The fan assembly according to  claim 2 , wherein said pockets are formed by the second ledge formations in cooperation with the side wall of the air conveying ring.