ARTO ALFTHAN,TIMO NEUVONEN,JONI TURUNEN,SAMULI JORMANAINEN,ESA Jääskeläinen
申请号：
US16242454
公开号：
US20190219075A1
申请日:
2019.01.08
申请国别(地区):
US
年份:
2019
代理人:
摘要：
A harvester head having at least one hydraulic actuator with a cylinder and a piston. The hydraulic actuator having at least a cylinder chamber and a piston rod chamber, both chambers being connected to a hydraulic circuit. The piston separating the cylinder chamber and the piston rod chamber, a cavity provided in the piston, hydraulically connecting the cylinder chamber with the piston rod chamber and a check valve in connection with the cavity that allows hydraulic medium flow in an opening direction of the check valve.
