Travel drive for a vehicle with a main drive and a hydrostatic auxiliary drive

摘要

In a travel drive for a vehicle with a main drive (A) and a hydrostatic auxiliary drive (B) a motor (2; 7) is arranged in the main drive (A) and in the auxiliary drive (B) respectively for the generation of tractive force and the tractive force of the motor (7) of the auxiliary drive (B) can be controlled as a function of the drive torque of the main drive (A). In order to permit a precise distribution of the tractive forces to the main drive (A) and the auxiliary drive (B) for only a small cost, the main drive (A) has a hydrostatic transmission with at least one pump (1) and at least one motor (2) and a device is provided for the detection of a signal, varying as a function of the pressure in the hydrostatic transmission of the main drive (A), which device is operatively connected to a pressure control circuit of the hydrostatic transmission of the auxiliary drive (B). According to a first embodiment the hydrostatic transmission of the main drive (A) has a pressure transducer (11), which is connected to the first input of a comparison point (9b) of a pressure control circuit of the hydrostatic transmission of the auxiliary drive (B). A pressure transducer (10) of the hydrostatic transmission of the auxiliary drive (B) is connected to the second input of the comparison point (9b). The output of the comparison point (9b) is connected to a pressure regulator (9), which is designed to act on an adjusting device (8) of the pump (6) and/or of the motor (7) of the hydrostatic transmission of the auxiliary drive (B).