An auxiliary transmission actuation mechanism 200 in a manual dual clutch power transmission unit 10 comprising a main drive shaft, a synchro-shuttle transmission unit, a dual clutch unit, and a multi-speed transmission unit having an odd shaft, an even shaft, an odd drive gear, an even drive gear, an odd and even driven gear, an output shaft, said auxiliary transmission actuation mechanism 200 comprising:
- a shift fork 208 adapted to be connected to a shift rail 210 at a predetermined position, said shift fork 208 having a plurality of lugs 208L;
- a clutch control valve actuating arm 212 adapted to be connected to said shift rail 210 at a predetermined position;
- a transmission actuating gear 202 adapted to be mounted onto at least one of said even shaft and said odd shaft through a transmission actuating gear driven bush 112 at a predetermined position and rotatably connected to a forward drive gear of said synchro-shuttle transmission unit, said transmission actuating gear 202 defines a plurality of locking elements 202L;
- a gear actuating means 206 adapted to be movably connected to at least one of said even shaft and said odd shaft, said gear actuating means 206 defines a plurality of locking elements 206L corresponding to the plurality of locking elements 202L of said transmission actuating gear 202;
- and a shift fork lug receiving portion 206R adapted to receive the plurality of lugs 208L of said shift fork 208 thereby connecting said shift fork 208 to said gear actuating means 206;
- wherein
- said clutch control valve actuating arm 212 is adapted to engage a movable member of a clutch control valve assembly 100V therein to move the movable member of said clutch control valve assembly 100V to a predefined position thereby actuating said clutch control valve assembly 100V to de-actuate said dual clutch unit on movement of said shift rail 210 along the predefined direction;
- and
- moving said shift rail 210 along the predefined direction moves said shift fork 208 and gear actuating means 206 from a neutral position (N) to an auxiliary transmission actuation gear position (T) in a direction towards said transmission actuating gear 202 therein to enable engagement of the plurality of locking elements 206L of said gear actuating means 206 with corresponding plurality of locking elements 202L of said transmission actuating gear 202 thereby facilitating actuation of said transmission actuating gear 202 therein to enable said transmission actuating gear 202 to drive at least one of said even shaft and said odd shaft through said gear actuating means 206 thereby transmitting the power from said main drive shaft 10M to said at least one of said even shaft and said odd shaft of the multi-speed transmission unit respectively when at least one of the forward drive gear and a reverse drive gear of said synchro-shuttle transmission unit is in engaged position, and at least one of said even shaft and said odd shaft drives said even drive gear and said odd drive gear respectively therein to enable at least one of said even drive gear and said odd drive gear to drive said output shaft through said odd and even driven gear on engagement of corresponding synchronizer unit with at least one of said even drive gear and said odd drive gear to transmit the power to said output shaft thereby propelling the vehicle when at least one of said dual clutch unit and the hydraulic system of the vehicle is not functioning.