Patent ID: 8083018

Claim:
A rear swinging fork ( 1 ) for a motorcycle frame, comprising: two longitudinal extending supporting arms ( 2 , 3 ) each supporting arm comprising in a section transverse to the longitudinal direction of the rear swinging fork ( 1 ) three supporting walls ( 6 , 7 , 8 ), the supporting walls being an upper supporting wall ( 6 ), a lower supporting wall ( 7 ), and an inboard supporting wall ( 8 ) connecting the upper ( 6 ) and lower supporting walls ( 7 ); a transverse cross member ( 4 ) connecting the supporting arms ( 2 , 3 ); wherein each of the supporting arms ( 2 , 3 ) has a pivot mount ( 5 ) for pivotal connection of the rear swinging fork ( 1 ) to the motorcycle frame; and in a region of each of the ends of the supporting arms, opposite the pivot mounts ( 5 ), a wheel mount ( 11 ) for the rear wheel of a motorcycle; wherein: the rear swinging fork is die cast as one piece; portions of the supporting arms between the cross member ( 4 ) and the pivot mounts ( 5 ) are configured open, and a portion of the inboard supporting wall ( 8 ) also extends integrally between the two supporting arms ( 2 , 3 ) along a portion of the cross member ( 4 ) facing the pivot mounts ( 5 ), where it forms a front wall 10 of the cross member ( 4 ), there being no other cross member provided between the pivot mounts ( 5 ); and the supporting walls form there between a laterally outwardly open longitudinal cavity.