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US 12,560,228 B2Granted
All wheel drive electric transmission
AssigneeDana Heavy Vehicle Systems Group, LLC
InventorsWilliam F. Waltz, Darren J. Ziskovsky, Jeffrey M. David
Life of this patent
Estimating the term…
Abstract
Methods and systems for an electric drive. The electric drive system includes, in one example, an electric machine, and a multi-speed transmission rotationally coupled to the electric machine, rotationally coupled to two output shafts. The multi-speed transmission includes a differentiating meshed planet compound planetary gear set rotationally coupled and positioned coaxial to a mode planetary gear set and a mode clutch configured to shift between two operating modes.
Claims14
An electric drive system, comprising:
- an electric machine;
- and
- a multi-speed transmission rotationally coupled to the electric machine and including:
- a differential gear set rotationally coupled and positioned coaxial to a Ravigneaux planetary gear set;
- and
- a mode clutch configured to selectively:
- ground a carrier in the Ravigneaux planetary gear set;
- ground a sun gear in the Ravigneaux planetary gear set;
- and
- rotationally couple the carrier to the sun gear in the Ravigneaux planetary gear set;
- wherein the differential gear set is rotationally coupled to two output shafts;
- wherein a first output shaft of the two output shafts is rotationally coupled to a first drive axle that includes a first axle differential that is rotationally coupled to a first set of drive wheels;
- and
- wherein a second output shaft of the two output shafts is rotationally coupled to a second drive axle that includes a second axle differential that is rotationally coupled to a second set of drive wheels.
11 more elements
A method for operating an electric drive system, comprising:
- operating a mode clutch to transition between two of three operating modes;
- wherein the electric drive system includes:
- an electric machine;
- and
- a multi-speed transmission rotationally coupled to the electric machine and including:
- a differential gear set rotationally coupled and positioned coaxial to a Ravigneaux planetary gear set;
- and
- the mode clutch;
- wherein the mode clutch is configured to:
- in a first mode, ground a carrier or a ring gear in the Ravigneaux planetary gear set;
- in a second mode, ground a sun gear in the Ravigneaux planetary gear set;
- and
- in a third mode, rotationally couple the carrier or the ring gear to the sun gear in the Ravigneaux planetary gear set;
- wherein the transition between the two operating modes includes the first mode to the second mode, the second mode to the third mode, or the first mode to the third mode;
- wherein the differential gear set is rotationally coupled to two output shafts;
- wherein a first output shaft of the two output shafts is rotationally coupled to a first drive axle that includes a first axle differential that is rotationally coupled to a first set of drive wheels;
- and
- wherein a second output shaft of the two output shafts is rotationally coupled to a second drive axle that includes a second axle differential that is rotationally coupled to a second set of drive wheels.
15 more elements
An electric drive system, comprising:
- an electric machine;
- and
- a multi-speed transmission rotationally coupled to the electric machine and including:
- a differential gear set rotationally coupled and positioned coaxial to a Ravigneaux planetary gear set;
- and
- a mode clutch configured to:
- ground a carrier in the Ravigneaux planetary gear set in a first mode;
- ground a sun gear in the Ravigneaux planetary gear set in a second mode;
- and
- rotationally couple the carrier to the sun gear in the Ravigneaux planetary gear set in a third mode;
- wherein the differential gear set is rotationally coupled to two output shafts;
- wherein a first output shaft of the two output shafts is rotationally coupled to a first drive axle that includes a first axle differential that is rotationally coupled to a first set of drive wheels;
- and
- wherein a second output shaft of the two output shafts is rotationally coupled to a second drive axle that includes a second axle differential that is rotationally coupled to a second set of drive wheels.
11 more elements
Dependencies are inferred from the claim text.