Hydraulic steering assembly with change in transmission ratio an

Details Hydraulic steering assembly with change in transmission ratio an Hydraulic steering assembly with change in transmission ratio an

1997-10-30

1999-10-26

Ryznic, John E.

Power plants

Pressure fluid source and motor

Expansible chamber type volumetric responsive measuring...

91375R, 13762524, F15B 910, F16D 3102

Patent

active

059707089

ABSTRACT:
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 steering 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 changing 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 cylinder lines by way of throttles. Steering devices of this type are employed in mobile equipment, in particular in slowly moving vehicles.

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patent: 5634495 (1997-06-01), Rasmussen et al.
patent: 5638864 (1997-06-01), Haarstad et al.
patent: 5819532 (1998-10-01), Wang et al.

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