Washing Group for Laundry Washing Machines

Abstract

A washing group ( 1 ) for laundry washing machines has a hollow washing tub ( 2 ), a revolving drum ( 3 ) fitted in axially rotatable manner inside the washing tub ( 2 ), and a motor assembly ( 4 ) which is rigidly attached outside the washing tub ( 2 ) and is capable of driving into rotation the revolving drum ( 3 ) inside the washing tub ( 2 ). The motor assembly ( 4 ) has a drive motor ( 8 ) and a supporting structure ( 10 ) provided with a number of connecting arms ( 15 ) each of which juts out from the drive motor ( 8 ) towards the peripheral wall ( 9 ) of washing tub ( 2 ), and has the distal end fitted onto a corresponding coupling pin ( 14 ) which cantilevered extends from the washing tub ( 2 ). Each coupling pin ( 14 ) is substantially ogival-shaped and the distal end of each connecting arm ( 15 ) having a substantially ogival-shaped, hollow seat ( 16 ) which is substantially complementary in shape to that of the corresponding coupling pin ( 14 ) so as to be axially engaged by said coupling pin ( 14 ).

1 . A washing group for laundry washing machines comprising a hollow washing tub, a revolving drum fitted in axially rotatable manner inside the washing tub, and a motor assembly including a drive motor which is rigidly attached outside the washing tub and is capable of driving into rotation the revolving drum inside the washing tub;
 the motor assembly also including at least one connecting part having an end portion fitted onto a corresponding coupling pin extending from the washing tub or vice versa;   wherein each coupling pin has a frustoconical-shaped distal portion and an adjacent, cylindrical-shaped mid portion adjoining said frustoconical-shaped distal portion; and the end portion of the connecting part has a hollow seat which is substantially complementary in shape to that of the corresponding coupling pin so as to be axially engaged by said coupling pin.   
     
     
         2 . The washing group according to  claim 1 , wherein said cylindrical-shaped mid portion adjoins the frustoconical-shaped distal portion to a proximal end of the coupling pin which is rigidly connected to the washing tub or to the drive motor; the proximal end of said coupling pin having, adjacent to said cylindrical-shaped mid portion and opposite to the frustoconical-shaped distal portion, a stop surface wherein the distal end of the connecting part stably abuts. 
     
     
         3 . The washing group according to  claim 2 , wherein the proximal end of said coupling pin is provided with a substantially annular-shaped, stop shoulder which adjoins the cylindrical portion, and wherein the distal end of connecting part stably abuts. 
     
     
         4 . The washing group according to  claim 1 , wherein the axial length (l a ) of said frustoconical-shaped distal portion is greater than the axial length (l b ) of said cylindrical-shaped mid portion. 
     
     
         5 . The washing group according to  claim 4 , wherein the axial length (l b ) of said cylindrical-shaped mid portion is moreover approximately equal to half the axial length (l a ) of said frustoconical-shaped distal portion. 
     
     
         6 . The washing group according to  claim 1 , wherein the opening angle (a) of said frustoconical-shaped distal portion ranges between 20° and 60°. 
     
     
         7 . The washing group according to  claim 1 , wherein the outer diameter of said cylindrical-shaped mid portion ranges between 8 and 40 millimeters. 
     
     
         8 . The washing group according to  claim 1 , wherein the motor assembly includes a number of connecting parts each having an end portion fitted onto a corresponding coupling pin extending from the washing tub or vice versa, and in that said coupling pins are substantially parallel to a common fitting direction (f). 
     
     
         9 . The washing group according to  claim 1 , wherein the motor assembly includes a number of connecting parts each having an end portion fitted onto a corresponding coupling pin extending from the washing tub or vice versa, and in that all coupling pins are identical in shape to one another and are preferably four in number. 
     
     
         10 . The washing group according to  claim 8 , wherein said revolving drum extends coaxial to a longitudinal axis (A) of the washing tub, and in that said fitting direction (f) is substantially parallel the longitudinal axis (A) of said washing tub. 
     
     
         11 . The washing group according to  claim 1 , wherein said motor assembly moreover comprises at least one fixing screw engaging in sequence the end portion of the connecting part and the corresponding coupling pin. 
     
     
         12 . The washing group according to  claim 11 , wherein said fixing screw extends coaxial to said coupling pin. 
     
     
         13 . The washing group according to  claim 11 , wherein the motor assembly includes a number of connecting parts each having an end portion fitted onto a corresponding coupling pin extending from the washing tub or vice versa, and in that said motor assembly comprises a fixing screw for each coupling pin. 
     
     
         14 . The washing group according to  claim 1 , wherein the motor assembly additionally comprises a supporting structure which is provided with a number of connecting arms each of which juts out from the drive motor towards the peripheral wall of washing tub; the distal end of each connecting arm forming a respective end portion of the connecting part. 
     
     
         15 . A laundry washing machine having an outer casing structured for resting on the floor, and a washing group which is arranged inside the casing and comprises a hollow washing tub, a revolving drum fitted in axially rotatable manner inside the washing tub, and a motor assembly which is rigidly attached outside the washing tub and is capable of driving into rotation the revolving drum inside the washing tub; wherein said washing group is a washing group according to  claim 1 .