Rolling element cage for geared turbofan

A geared turbofan engine comprising:

• a fan configured to drive air along a bypass flow path;
• a compressor section configured to communicate compressed air to a combustor section for generating a high energy gas flow for driving a turbine section where energy is extracted and utilized to drive the compressor section and the fan;
• and
• a gear system driven by the turbine section for driving the fan, the gear system including a sun gear rotatable about an engine centerline, a non-rotatable ring gear, a rotating carrier that drives the fan, a plurality of planet gears intermeshed between the sun gear and the ring gear, a rolling element bearing assembly corresponding with each of the plurality of planet gears and supporting rotation of a corresponding one the plurality of planet gears on the carrier,
• wherein the rolling element bearing assembly includes a rolling element between an inner race and an outer race separated by a cage, the inner race is disposed on a radially outermost surface of a corresponding one of the plurality of planet gears and includes guide rails that provide a surface to surface interface supporting the cage, the outer race is supported on the rotating carrier, a first passage extends through each of the plurality of planet gears, and a second passage extends through the inner race communicate lubricant to an interface between a surface of the guide rails of the inner race and a surface of the cage.