HYDRAULIC STEERING ASSEMBLY WITH CHANGE IN TRANSMISSION RATIO AND FLOW AMPLIFICATION

摘要

In order to continuously change the transmission ratio between power-assisted steering mode and emergency steering mode and to maximize the flow of hydraulic oil in the power-assisted steering mode when the steering wheel is rapidly turned, a steeri ng assembly is proposed which uses a common line which bypasses the metering pump, as a supply line for flow amplification during power-assisted operation and as a return line for chan ging the transmission ratio during emergency operation. This common line is connected to selected supply lines by way of throttles and with corresponding cylinder lines or with all cyli nder lines by way of throttles. Steering devices of this type are employed in mobile equipment, in particular in slowly moving vehicles.