Two speed accessory drive

Claim 1

A two speed accessory drive operative to drive an output member at either of two predetermined speeds relative to the speed of input member or shaft comprising: a drum rotatable with said input shaft and including an engagement surface; a planetary gear set positioned remote from said drum comprising a sun gear, a plurality of planet gears drivingly linked to said sun gear and supported by a planet carrier and a ring gear drivingly positioned about said planet gears, said sun gear drivingly connected to said input shaft and said planet carrier operatively connected to said output member; means for rotationally isolating said planet carrier and said output member from said input shaft; engagement means comprising: a shoe disk positioned within said drum and drivingly connected to said ring gear; a plurality of centrifugal acting, braking shoes rotatable with and pivotally supported relative to said shoe disk; means for moving said brake shoes to a first or engaged condition to engage said brake shoes to said drum for moving said brake shoes to a second or disengaged condition to disengage said brake shoes from said drum, and means for selectively stopping the rotation of said ring gear during instances where said brake shoes are disengaged from said drum for permitting said planet carrier to rotate at a speed less than the speed of the input shaft; and wherein said moving means further includes a plurality of levers one for each brake shoe, pivotally connected to a corresponding one of said brake shoes and wherein said engagement means further includes means for moving said levers relative to said shoe disk to move said brake shoes to said first and second conditions; and wherein said lever moving means further comprises a disk rotatably positioned about said input shaft including means for engagably connecting and moving said levers in a first direction to cause said brake shoes to move to said first condition.