LAUNDRY WASHING MACHINE

A laundry washing machine (1) having an outer casing (2) and comprising, inside said outer casing (2): a washing tub (3) adapted to contain the washing liquid; a rotatable drum (4) which is fitted in axially rotatable manner inside the washing tub (3) and is adapted to contain the laundry to be washed; and at least one ball balancing ring (13) which is rigidly secured to the rotatable drum (4) for reducing the vibrations of the drum (4); said at least one ball balancing ring (13) comprises: a nearly toroidal, annular housing (15) which is rigidly secured to the drum (4) and has a tubular structure with a substantially polygonal-shaped, transversal cross-section, so as to delimit a closed annular inner cavity (16) with a substantially polygonal-shaped cross-section; and a number of balancing masses (17) accommodated in free movable manner inside said annular inner cavity (16) together with a dumping liquid that damps out the movement of the balancing masses (17) inside the same annular inner cavity (16); the polygon defining/resembling the shape of the transversal cross-section of the annular housing (15) having a first (25) and a second (26) consecutive sides that are located substantially astride of a midplane (P) of the annular housing (15), opposite to a central axis (B) of the annular housing (15), are inclined to one another and are both non-perpendicular to the same midplane (P).