Automatic transmission brake assembly including an overrunning roller brake and a friction brake

Claim 1

In an overrunning roller brake assembly for a planetary gear unit in an automatic transmission for automobiles, said gear unit having a ring gear, a carrier and a sun gear, said carrier having planet pinions thereon engaging said sun and ring gears; a brake for anchoring a reaction member of said gear unit, at least one other member of said gear unit being adapted to receive driving torque; said brake comprising an annular inner brake race surrounding a fixed part of said transmission, an annular outer brake race connected to said reaction member and surrounding said inner race, said outer race comprising an extrusion with an outer brake drum surface adapted to be engaged by a reaction friction brake band; overrunning brake rollers between said races, a pair of support rings between said races on either side of said rollers; said support rings having a C-shaped cross section whereby the inner and outer surfaces thereof provide a bearing support for said races; retainer rings enclosed within said support rings, said retainer rings having a radial thickness approximately equal to the radial inside dimension of said C-shaped cross section of said support rings whereby radial loads are transmitted between said races through said retainer rings and support rings.