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US 7,062,984 B2Granted
Vehicle powertrain with two-wheel and four-wheel drive ratios
AssigneeGeneral Motors Corporation
InventorRaymond J. Haka
Life of this patent
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Abstract
A vehicle powertrain incorporates a planetary gearset which is coupled with a front wheel drive mechanism and a rear wheel drive mechanism. The planetary gearset is controlled by two torque-transmitting mechanisms to establish an input member of the planetary gearset as well as a grounded member for the planetary gearset in combinations that will provide a two-wheel low drive ratio, a two-wheel high drive ratio, a four-wheel low drive ratio, and a four-wheel high drive ratio.
Claims6
A vehicle powertrain comprising:
- a transmission output means;
- a planetary gearset including first, second, and third members, a transfer drive means drivingly connected with said first member, a first torque-transmitting mechanism selectively connecting said output means with said first and second members individually, a second torque-transmitting mechanism selectively connecting said third member with a stationary member;
- a first final drive means including said transfer drive means is continuously connected with said first member;
- a second final drive means continuously connected with said second member;
- and
- said torque-transmitting mechanisms being engaged individually or in combination to establish a first drive path through said first final drive, a second drive path through said second final drive, a third four-wheel drive path through both said final drives, and a fourth four-wheel drive path through both said final drives, and having a drive ratio distinct from said third four-wheel drive path.
3 more elements
Dependencies are inferred from the claim text.