| 摘要 |
A drive device for vehicles comprises: a drive prime mover, a power splitting hydrostatic mechanical transmission coupled with the prime mover and having a planetary differential transmission with at least four shafts and two groups of planet wheels, two sun wheels, a web and an annulus, two main shafts forming an input and output and connected with different shafts of the planetary differential transmission, a clutch two variable displacement hydrostatic machines which are respectively connected in at least one operational range with a respective shaft of the planetary differential transmission and are adapted to alternately operate as a pump and as a motor, a first hydrostatic machine which, when the second hydrostatic machine is stationary, being able to be switched over from the input main shaft to the sun wheel, not on the drive side, on transition from one to the other operational range by means of said clutch means and during traction operation is switched over from the motor to the pump function. An additional mechanical transmission connected to the output of the power splitting transmission and has gering and two clutches for operation in two transmission is ratios, and a controller which on switching from one of the transmission ratios to the other causes actuation of the clutches as well as a sudden opposite modification of the displacement controlling angle of the first and second hydrostatic machines thus causing the displacement of the second hydrostatic machine to be increased to maximum while the displacement of the first machine decreases to zero. |
