Hydraulic drive for the feed rollers of a head of a wood harvesting machine

摘要

Disclosed is a hydraulic drive with two radial piston motors which are rotationally fixedly coupled to feed rollers of a harvester head, wherein a radial piston motor has only one stroke volume and the other radial piston motor has two stroke volumes, between which can be switched. Thus, a log, stretched between the feed rollers, can be moved at two speeds. At the higher speed takes place in the second stroke volume of the switchable radial piston engine, a pressure medium circulation at a control pressure.