Steering system for vehicle has first steering motor unit with first locking valve device and second steering motor arrangement with different type of locking valve device

摘要

The system has a pressure source, a steering unit and first (6) and second steering motor arrangements for connection to the steering unit. The first steering motor arrangement has a first locking valve device (22) and the second has a different type of locking valve device (27). The first locking valve device has a first blocking valve arrangement (24a,24b) in each directional line (L,R) controlled by pressure in the other line.