Divided flywheel

Apparatus for reducing the transmission of vibrations from an engine to a transmission line comprising:

• a divided flywheel having an input part connected to an output of the engine and a coaxial output part connected to the input of the transmission line;
• coupling spring means, disposed between said input and output parts, for rotatably coupling said parts and for allowing the output part to rotate relative to the input part, said coupling spring means comprising a plurality of helicoidal springs arranged tangentially to a flywheel axis in openings formed in two annular discs which are rigidly attached to one of said input and output parts, and an annular member rigidly attached to the other of said parts, said annular member having radial elongations extending between adjacent ones of the helicoidal springs;
• first connecting part means, frictionally connected to one of said input and output parts, for engaging the other of said parts following relative displacement of said parts by a first predetermined angular displacement, said connecting part means comprising an annular part frictionally coupled to said one of said input and output parts, and having circumferentially spaced elongations extending into recesses formed in said annular member of said coupling spring means, and wherein a subset of said circumferentially spaced elongations engage respective edges of said recesses following relative displacement of said parts by said first predetermined angular displacement;
• and
• stop spring means, arranged on one of said input and output parts, for engaging a stop on the other of said parts following relative displacement of said parts by a second predetermined angular displacement, said stop spring means comprising helicoidal springs tangentially arranged in additional openings formed in the annular discs between said circumferentially spaced elongations and within said recesses;
• and
• wherein said subset of elongations are clamped between the stop spring means and said respective edges of said recesses when said parts are relatively displaced in excess of said second predetermined relative displacement.