Allison Transmission, Inc.

Conrad Rockey

Nayan V Patel

Jorge F Briceno

Jerry Suiter

A multi-speed transmission including a plurality of planetary gearsets and a plurality of selective couplers to achieve at least eight forward speed ratios is disclosed. The plurality of planetary gearsets may include a first planetary gearset, a second planetary gearset, a third planetary gearset, and a fourth planetary gearset. The plurality of selective couplers may include a number of clutches and a number of brakes. The multi-speed transmission may have four planetary gearsets and six selective couplers. The six selective couplers may include two clutches and four brakes.

Multi-speed planetary transmission

A multi-speed transmission including a plurality of planetary gearsets and a plurality of selective couplers to achieve at least eighteen forward speed ratios and at least two reverse speed ratios is disclosed. The plurality of planetary gearsets may include a first planetary gearset, a second planetary gearset, a third planetary gearset, a fourth planetary gearset, and a fifth planetary gearset. The plurality of selective couplers may include a number of clutches and a number of brakes. The multi-speed transmission may have five planetary gearsets and eight selective couplers. The eight selective couplers may include three clutches and five brakes.

A multi-speed transmission including a plurality of planetary gearsets and a plurality of selective couplers to achieve at least ten forward speed ratios is disclosed. The plurality of planetary gearsets may include a first planetary gearset, a second planetary gearset, a third planetary gearset, and a fourth planetary gearset. The plurality of selective couplers may include a number of clutches and a number of brakes. The multi-speed transmission may have four planetary gearsets and seven selective couplers. The seven selective couplers may include three clutches and four brakes.

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Conrad Rockey