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US 2018/0288953 A1Published application
Hydraulic Drive for the Feed Rollers of a Head of a Complete Timber Harvester
AssigneeRobert Bosch GmbH
InventorIain Edward
Life of this patent
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Abstract
A hydraulic drive for feed rollers of a head of a complete timber harvester includes two radial piston motors coupled for conjoint rotation to the feed rollers. One radial piston motor has only one displacement volume and the other radial piston motor has two displacement volumes, between which it is possible to switch. A tree trunk clamped between the feed rollers can thus be moved at two speeds. At the higher speed, pressure medium circulates under a control pressure in the second displacement volume of the switchable radial piston motor.
Claims17
A hydraulic drive for feed rollers of a head of a complete timber harvester, comprising:
- a first radial piston motor including two ports in operative connection with a first group of cams, and two other ports in operative connection with a second group of cams;
- and
- a second radial piston motor,
- wherein the second group of cams is configured to be deactivated by connecting the two other ports to one another and simultaneously to a control pressure line or to a first control pressure port.
1 more element
Dependencies are inferred from the claim text.