Patent ID: 9730376
Date: 2017-08-15
CPC Classifications: A01B,A01D,B62D

Claim:
1. A self-propelled harvesting machine comprising: a front harvesting attachment; a ground drive with first and second drive shafts offset relative to the front harvesting attachment in the longitudinal direction of the harvesting machine; first and second track roller units to which the first and second drive shafts are drivably connected respectively, wherein the first and second track roller units extend on both sides of the harvesting machine and run in the longitudinal direction thereof; a hydrostatic transmission comprising first and second hydraulic motors and first and second mechanical transmissions; and a rear axle having rear wheels that are steered via a steering mechanism provided in a rear region of the harvesting machine; wherein each of the first and second drive shafts is driven separately by the respective first and second hydraulic motors of the hydrostatic transmission, respectively; wherein a displacement volume of each of the first and second hydraulic motors is changed depending on a steering movement transferred from the steering mechanism to the rear wheels such that an additional moment about a vertical axis of the harvesting machine is achieved simultaneously with the steering of the rear wheels; and wherein the first and second hydraulic motors drive the first and second drive shafts, respectively, via the first and second mechanical transmissions, which first and second mechanical transmissions are shiftable in at least two transmission ratio steps.