Patent ID: 7983825

Claim:
A method of changing first and second gears in a transmission with a hydrostatic transmission and a manual gearbox connected downstream therefrom, a synchronizer being arranged in said downstream manual gear box, comprising: reducing an output torque of a hydrostatic motor and that of a transmission input shaft which is connected to the hydrostatic motor, disengaging the first said engaged gear of the manual gearbox which is connected downstream, determining a rotational speed of the hydrostatic motor and that of the transmission input shaft which is connected to the hydrostatic motor corresponding to the gear to be engaged, adjusting the gear ratio of the hydrostatic transmission, so that the rotational speed of the hydrostatic motor and of the transmission input shaft which is connected to the hydrostatic motor is higher than the determined corresponding rotational speed, irrespective of the direction of the gear change, and engaging the second said gear to be engaged; said steps of determining the rotational speed of the hydrostatic motor and of the transmission input shaft, and of adjusting the gear ratio of the hydrostatic transmission being implemented after the disengagement of said first gear and prior to the engagement of said second gear.