Automatic rear wheel self-centering device for four-wheel steering vehicles

摘要

An automatic rear wheel self-centering device for four-wheel steering vehicles is disclosed. The device automatically performs the rear wheel self-centering operation when the steering mode of the vehicle returns from another steering mode to the standard steering mode. The device has a branch conduit branched from a conduit leading from the steering unit (102) to the steering mode selection valve (111). A conduit control valve (4) is mounted to the branch conduit and is changeable between a neutral position blocking the branch conduit, a first position connecting the branch conduit to one side chamber of the rear wheel steering cylinder and a second position connecting the branch conduit to the other side chamber of the cylinder. The spool of the conduit control valve moves synchronous with a linear movement of the piston (116) of the rear wheel steering cylinder (115), thereby changing the position of the conduit control valve between the above three positions. <IMAGE>