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US 2003/0125153 A1Published application
Low range mode for continuously variable transmission
OwnerRichard Kukucka, Thomas A. Daileyinventors
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Abstract
A vehicle is provided with a continuously variable transmission having a low range operating mode for off road driving. A wide range continuously variable transmission is combined with a high fixed ratio final drive mechanism to provide a high gear ratio low range mode. A power take-off unit provides driving torque to a second pair of drive wheels and a coupling mechanism is provided in a second drive line for providing all wheel drive operation in response to wheel slip of the primary drive wheels.
Claims20
A vehicle powertrain, comprising:
- a continuously variable transmission;
- and
- a fixed ratio drive gear mechanism with gear reduction connected to said continuously variable transmission, wherein said continuously variable transmission with the fixed ratio drive gear mechanism has an effective low range gear ratio of at least 15.
A vehicle, comprising:
- an engine;
- a continuously variable transmission having a drive pulley and a driven pulley drivingly connected by a belt, said drive pulley drivingly connected to said engine, said continuously variable transmission further including a fixed ratio drive gear mechanism connected to said driven pulley, said fixed ratio drive gear mechanism having a gear ratio of at least 5;
- a first differential connected to a first pair of drive wheels and drivingly connected to said fixed ratio drive gear mechanism through a first drive line;
- a second differential connected to a second pair of drive wheels and drivingly connected to said fixed ratio drive gear mechanism through a second drive line;
- and
- a coupling mechanism in said second drive line for delivering torque to said second pair of drive wheels in response to slip of said first pair of drive wheels.
3 more elements
Dependencies are inferred from the claim text.