Gear flexible coupling for transmitting torque between a drive shaft and a driven shaft, particularly for use on high-speed trains

摘要

The gear coupling (10; 110) comprises first and second half-couplings (12, 12'; 112, 112'), each comprising a hub (14, 14'; 114, 114') provided with rounded outer teeth (36, 36'; 136, 136') and a sleeve (16, 16'; 116, 116') provided with inner teeth (40, 40'; 140, 140') meshing with the outer teeth (36, 36'; 136, 136'). Each hub comprises a first radially inner tubular portion (26, 26'; 126, 126') and a second radially outer tubular portion (28, 28'; 128, 128'), which is arranged coaxially to the first one and on which the outer teeth (36, 36'; 136, 136') are provided. Each half-coupling further comprises a cap (44, 44'; 144, 144') which is fixed to the sleeve and comprises a tubular portion (48, 48'; 148, 148') extending in an annular seat (30, 30'; 130, 130') provided between the first and second tubular portions of the hub. At least one half-coupling further comprises an axial travel limiting device (52, 52'; 152, 152') which is accommodated in the annular seat of the hub and comprises a stop annular element (54, 54'; 154, 154') fixed to the tubular portion of the cap and a pair of abutment elements (56, 58, 56', 58'; 156, 158, 156', 158') which are fixed to the hub and are arranged on axially opposite sides with respect to the stop annular element so as to define respective axial abutment surfaces for this latter.