Supercharger pulley isolator

A rotary blower of the backflow type including a housing;

• first and second rotors rotatably disposed in said housing and having meshed lobes for transporting air from an inlet port to an outlet port;
• first and second shafts rotatably supported by said housing and having said first and second rotors, respectively, fixed for rotation therewith;
• first and second meshed timing gears fixed for rotation with said first and second shafts, respectively, for preventing contact of said meshed lobes;
• an input pulley adapted to be rotatably driven about an axis defined approximately by said first shaft, and in one direction, at speeds proportional to the speed of a periodic combustion torque transmitting engine selectively controllable between a relatively low speed and a relatively high speed;
• torsion damping means operably associated with said input pulley and said first timing gear;
• characterized by:
• (a) said first shaft including a forward portion extending forwardly of said first timing gear and axially to a location disposed generally within said input pulley;
• (b) bearing means disposed radially between said forward portion of said first shaft and said input pulley;
• (c) said torsion damping means comprising resilient means operable to resist relative rotation between said input pulley, and said forward portion of said first shaft;
• and
• (d) said torsion damping means further comprising means for limiting the relative rotation of said input pulley and said first shaft.