Full-time transfer case with syncronized range shift arrangement

Planetary gear transmission systems or components – With means to vary drive ratio or disconnect drive – Sun braked

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475204, 475221, F16H 358

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active

059249528

ABSTRACT:
A power transfer system is disclosed for a four-wheel drive vehicle operable for permitting a vehicle operator to select between various full-time and part-time four-wheel drive modes. The power transfer system includes a dualplanetary gear reduction unit that is operable for establishing high-range and low-range speed ratios, and a synchronized range shift mechanism that is adapted to permit the vehicle operator to shift on-the-fly for establishing full-time and part-time high-range and low-range four-wheel drive modes. The power transfer system includes an slip limiting/torque-biasing arrangement including an interaxle differential and a transfer clutch operable for controlling the magnitude of speed differentiation and torque biasing across the interaxle differential.

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