Christopher Stovall,Duqiang Wu,Navneet Gulati,Michael Glennon
申请号：
US16100803
公开号：
US10798866B2
申请日:
2018.08.10
申请国别(地区):
US
年份:
2020
代理人:
摘要：
The present inventors have recognized that hydraulic cylinders for raising and lowering “work units” of an agricultural implement used for engaging the ground can be improved by replacing one or more electronically controlled (electrohydraulic) proportional valves associated with a rod port of the cylinder with a simplified, flow control device, such as a pressure regulator, while still using the electronically controlled proportional valves associated with a base port of the cylinder. Due to the weight of the implement being associated with the rod side, which tends to force retraction of the rod when not opposed by the base side, complex proportional valves associated with the rod side can be replaced with such simplified devices providing a relatively low pressure sufficient to move hydraulic fluid with respect to the rod side.
