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Four-wheel motor vehicle drive transfer case with limited differentiation

  • US 5,738,604 A
  • Filed: 07/30/1996
  • Issued: 04/14/1998
  • Est. Priority Date: 07/30/1996
  • Status: Expired due to Fees
First Claim
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1. A four-wheel drive system for a vehicle having an engine and a transmission and including a torque transfer case for dividing torque for front and rear axles of the vehicle, said torque transfer case comprising:

  • an input shaft coupled to the transmission to be rotatably driven thereby;

    a first output shaft to transmit torque to a first axle of the vehicle;

    a second output shaft to transmit torque to second axle of the vehicle;

    an interaxle differential disposed between said input shaft and said first and second output shafts for transmitting torque from said input shaft to said first and second output shafts, and allowing said first and second output shafts to rotate differentially with respect to one another;

    a first one-way clutch to selectively lock said interaxle differential such that said first and second output shafts are rotatably coupled to one another when said second output shaft overruns said first output shaft; and

    a second one-way clutch to selectively lock said interaxle differential such that said first and second output shafts are rotatably coupled to one another when said first output shaft overruns said second output shaft by a predetermined amount.

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