Three speed planetary transmission
AssigneeAllison Transmission, Inc.
InventorsIsaac Mock, Joel E. Mowatt
Life of this patent
Estimating the term…
Abstract
A drive system for a hybrid or electric vehicle that includes a transmission with three forward and three reverse gears. The transmission optionally includes a first and a second planetary gearset, a first and a second clutch, and a brake. The system may be configured to separately engage these components in concert. The drive system may include a single electric motor with a corresponding transmission, or multiple electric motors individually driving separate transmissions. Motors may be arranged upstream or downstream of portions of a transmission, and they may be aligned parallel with or perpendicular to a drive axle.
Claims31
A drive system, comprising:
- a first and a second planetary gearset having a sun gear, a carrier with planetary gears, and a ring gear, wherein the carrier of the first planetary gearset is coupled to the sun gear of the second planetary gearset, and wherein the ring gear of the first planetary gearset is coupled to the carrier of the second planetary gearset;
- a first clutch operable to selectively couple an input shaft to the carrier of the first planetary gearset, and the sun gear of the second planetary gearset;
- a second clutch operable to selectively couple the sun gear of the first planetary gearset to the input shaft;
- and
- a brake operable to selectively couple the ring gear of the second planetary gearset to ground;
- wherein the carrier of the second planetary gearset is coupled to an output shaft.
A drive system comprising:
- a transmission that includes:
- a first and a second planetary gearset having a sun gear, a carrier with planetary gears, and a ring gear, wherein the carrier of the first planetary gearset is coupled to the sun gear of the second planetary gearset, and wherein the ring gear of the first planetary gearset is coupled to the carrier of the second planetary gearset;
- a first clutch operable to selectively couple an input shaft to the carrier of the first planetary gearset, and the sun gear of the second planetary gearset;
- a second clutch operable to selectively couple the sun gear of the first planetary gearset to the input shaft;
- and
- a brake operable to selectively couple the ring gear of the second planetary gearset to ground;
- an electric motor arranged and configured to transmit torque to the transmission via the input shaft;
- wherein the carrier of the second planetary gearset is coupled to an output shaft that is coupled to a drive axle.
A drive system comprising:
- a first and a second electric motor providing torque separately to a first and a second transmission via a first and a second input shaft coupling the first electric motor to the first transmission, and the second electric motor to the second transmission, wherein the first and second transmissions include:
- a first and a second planetary gearset having a sun gear, a carrier with planetary gears, and a ring gear, wherein the carrier of the first planetary gearset is coupled to the sun gear of the second planetary gearset, and wherein the ring gear of the first planetary gearset is coupled to the carrier of the second planetary gearset;
- a first clutch operable to selectively couple an input shaft to the carrier of the first planetary gearset, and the sun gear of the second planetary gearset;
- a second clutch operable to selectively couple the ring gear of the first planetary gearset to the input shaft;
- and
- a brake operable to selectively couple the ring gear of the second planetary gearset to ground;
- an output shaft coupled to the carrier of the second planetary gearset;
- wherein the output shaft of the first transmission is coupled to a first ground engaging member, and the output shaft of the second transmission is coupled to a second ground engaging member that is separate from the first ground engaging member.
Dependencies are inferred from the claim text.