Articulated vehicle with hydraulic steering

摘要

A double acting hydraulic shock absorber is connected across first and second fluid conduits that are connected to opposite ends of hydraulic steering motors of an articulated vehicle and to a control unit that is controlled by a steering wheel to control the direction of movement of the vehicle. A pump provides pressurized fluid to the control unit. The shock absorber has a response pressure of a predetermined value and includes a piston in a tubular housing intermediate portion. A first shank is joined to the piston to abut against a first closure that closes one end of the housing to limit movement from the piston's datum position and a second shank joined to the piston to abut against a second closure that closes the opposite end of the housing to limit movement from the datum position toward the second closure. A pre-stressed spring, and abutment and stop members are provided on each shank whereby when the piston moves from its datum position toward one closure the spring between that closure and the piston is compressed while the other spring does not resiliently urge the piston toward the one closure.