On-demand four-wheel drive transmission
February 4, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2262710 3235021 3732943 Four-wheel-drive system for automotive vehicle Four-wheel vehicle drive system Four-wheel drive system for automotive vehicle Four-wheel drive system with center differential lock control responsive to rpm difference Power transfer device for four wheel drive Power transmission for four-wheel drive vehicle Four wheel drive vehicle with inter-axle differential having dual planetary gear sets InventorsApplicationNo. 018191 filed on 02/04/1998US Classes:475/207, NONPLANETARY VARIABLE SPEED OR DIRECTION TRANSMISSION COMBINED WITH PLANETARY TRANSMISSION180/247, With manually operated means for disengaging drive to one or more, but fewer than all, of the four wheels180/249, And means for locking out the differential means475/204Variable speed or direction is planetary transmissionExaminersPrimary: Marmor, Charles A.Assistant: Lund, Scott Attorney, Agent or FirmForeign Patent References
International ClassesB60K 017/354F16H 037/08 AbstractA transmission for a four-wheel drive vehicle having a multi-speed geartrain and power transfer mechanism incorporated into a common housing assembly. The multi-speed geartrain includes a input shaft, a mainshaft, and a plurality of constant-mesh gearsets arranged for selectively coupling the mainshaft to the input shaft for driven rotation at various speed ratios. The mainshaft can be selectively coupled to the power transfer mechanism for establishing two alternative power transmission routes. In particular, a synchronized range shift mechanism is provided for establishing a high-range transmission route and a low-range transmission route from the mainshaft to a primary driveline to define a two-wheel drive mode. A portion of the drive torque delivered to the primary driveline can be transferred automatically through a transfer clutch to the secondary driveline to establish an on-demand four-wheel drive mode. As an option, a mode clutch can be provided for permitting the secondary driveline to be locked to the primary driveline for establishing a part-time four-wheel drive mode.Field of SearchVariable speed or direction is planetary transmissionTransmission output shaft parallel to differential output shafts NONPLANETARY VARIABLE SPEED OR DIRECTION TRANSMISSION COMBINED WITH PLANETARY TRANSMISSION With manually operated means for disengaging drive to one or more, but fewer than all, of the four wheels With differential means for driving two wheel sets at dissimilar speeds And means for locking out the differential means | |
