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

Patent · Tue Oct 11 04:00:00 EDT 1988

OSTI ID:6619988

Premiski, V; Hohnel, R; Premiski, C

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

• Assignee: Ford Motor Co., Dearborn, MI
• Patent Number(s): US 4776238
• OSTI ID: 6619988
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
AUTOMATION
AUTOMOBILES
BRAKES
DESIGN
FRICTION
GEARS
MACHINE PARTS
MECHANICAL STRUCTURES
MECHANICAL TRANSMISSIONS
OPERATION
RINGS
SUPPORTS
VEHICLES