Patent ID: 6327927
Filing Date: 2001-12-11
Classification: B60W,F16H,Y10T

Abstract:
In a motor vehicle, a power train comprising a prime mover, an automatically operable gearbox having a plurality of gear ratios, means for transmitting torque between said prime mover and said gearbox, and means for operating said gearbox including a signal receiving and signal transmitting control unit, monitoring means including at least one sensor arranged to transmit signals to said control unit, and actuating means including at least one actuator responsive to signals from said control unit to select gear ratios and to shift the gearbox into selected gear ratios, said at least one actuator including first and second driving units, a first transmission including a first worm gearing and arranged to transmit rotary motion from said first driving unit to a gear ratio selecting first rotary shaft of said gearbox, and a second transmission including a second worm gearing and interposed between said second driving unit and a second rotary shaft forming part of and arranged to shift said gearbox into the gear ratio selected by said first rotary shaft.