Patent ID: 6450285
Filing Date: 2002-09-17
Classification: B62D

Abstract:
A steering device for steering wheels of a steering axle of a motor vehicle having at least three axles, said steering axle being designed as a trailing or leading axle and comprising:a hydraulic arrangement for steering actuation of the wheels of the steering axle, and an electronic arrangement associated with the hydraulic arrangement, the electronic arrangement comprising means for monitoring functions of the steering device and, in an emergency, means for effecting a change-over of the steering device from a normal operation to an emergency operation, the steering axle comprising wheels that are self-tracking in the emergency operation, the hydraulic arrangement comprising a double-acting hydrostatic actuating assembly, a regulating/control valve and a clearing valve, a first hydraulic connection of the actuating assembly being assigned to one actuating direction of the actuating assembly, and connected by a first hydraulic line to a first connection of the regulating/control valve, and a second hydraulic connection of the actuating assembly being assigned to the other actuating direction of the actuating assembly and connected by a second hydraulic line to a second connection of the regulating/control valve, a first connection of the clearing valve being connected to the first hydraulic line and a second connection of the clearing valve being connected to the second hydraulic line, such that when the clearing valve is in a first position assigned to the normal operation of the steering device, both connections of the clearing valve are shut off, and when the clearing valve is in a second position assigned to the emergency operation of the steering device, both connections of the clearing valve are connected to one another, a first throttle element arranged in the first hydraulic line between the actuating assembly and a connection point of the clearing valve which is assigned to the first hydraulic line, a second throttle element arranged in the first hydraulic line between the regulating/control valve and the connection point of the clearing valve which is assigned to the first hydraulic line, a third throttle element arranged in the second hydraulic line between the actuating assembly and a connection point of the clearing valve which is assigned to the second hydraulic line, and a fourth throttle element arranged in the second hydraulic line between the regulating/control valve and the connection point of the clearing valve which is assigned to the second hydraulic line.