Two-speed accessory drive pulley

A two-speed pulley assembly for an engine accessory drive comprising:

• an axis;
• a planetary gear comprising:
• a ring gear rotatable about the axis;
• a sun gear;
• a planet carrier arranged for driving engagement with an engine crankshaft and including at least one planetary pin, radially offset from the axis;
• and
• at least one planet gear:
• rotatable relative to the planet carrier about the at least one planetary pin;
• and
• drivingly engaged with the ring gear and the sun gear;
• a pulley circumscribing the ring gear and in driving engagement with the ring gear;
• a friction clutch arranged to selectively prevent rotation of the sun gear;
• a one-way clutch arranged between the sun gear and the ring gear that:
• permits rotation of the sun gear relative to the ring gear in a first rotational direction;
• and
• prevents rotation of the sun gear relative to the ring gear in a second rotational direction, opposite the first rotational direction;
• and
• a torsional isolator drivingly connected to the planet carrier and arranged to rotate at a same speed as the planet carrier.