Abstract: A method of and apparatus for operating an automated mechanical transmission (AMT) achieves switching between and selecting one of a plurality of automated mechanical transmission shift scheduling modes. Such switching or selection occurs and is controlled by the vehicle operator undertaking a sequence of non-routine operating steps or inputs which are interpreted by a microprocessor or controller as a request for a change of the shift scheduling mode.

Abstract: A method of and apparatus for operating an automated mechanical transmission (AMT) achieves switching between and selecting one of a plurality of automated mechanical transmission shift scheduling modes. Such switching or selection occurs and is controlled by the vehicle operator undertaking a sequence of non-routine operating steps or inputs which are interpreted by a microprocessor or controller as a request for a change of the shift scheduling mode.

Abstract: The present invention provides a transmission including a main gear box and an auxiliary gear box secured to the main box. The auxiliary gear box includes an auxiliary shaft supporting an auxiliary gear with a clutch collar support on the auxiliary shaft adjacent to the auxiliary gear. The clutch collar is selectively actuatable between engaged and disengaged auxiliary gear positions. A piston housing is connected to the auxiliary gear box and supports solenoids fluidly connected to a piston on a shift shaft. The auxiliary box includes a bore therein supporting the shift shaft. The shift shaft is moveable axially between first and second positions in response to actuation of the solenoids corresponding to the engage and disengaged auxiliary gear positions. The shift shaft supports a shift fork that coacts with the shift collar.

Abstract: An auxiliary gear box for a transmission is provided including a piston housing having a first and second bore. A first piston is arranged within the first bore and separates the first bore into first and second chambers. A first shift shaft extends form the first piston and is connected to a first shift fork. A second piston is arranged within the second bore separating the second bore into third and fourth chambers. A second shift shaft extends form the second piston and is connected to a second shift fork. In one example, this invention provides first, second and third actuators for selectively actuating the pistons. The first actuator is fluidly connected to the first chamber. The second actuator is fluidly connected to the second and fourth chambers, and the third actuator is fluidly connected to the third chamber. The exposed surface area of the piston in the chamber having the shift shaft is less than the exposed surface area of the piston on the chamber opposite the shift shaft.

Abstract: The present invention provides a transmission including a main gear box and an auxiliary gear box secured to the main box. The auxiliary gear box includes an auxiliary shaft supporting an auxiliary gear with a clutch collar support on the auxiliary shaft adjacent to the auxiliary gear. The clutch collar is selectively actuatable between engaged and disengaged auxiliary gear positions. A piston housing is connected to the auxiliary gear box and supports solenoids fluidly connected to a piston on a shift shaft. The auxiliary box includes a bore therein supporting the shift shaft. The shift shaft is moveable axially between first and second positions in response to actuation of the solenoids corresponding to the engage and disengaged auxiliary gear positions. The shift shaft supports a shift for that coacts with the shift collar.