Abstract The invention relates to adding of auxiliary apparatus to a conventional or standard hydrostatic steering system of the type in which a steering wheel controlled metering device controls the application of pressurized fluid to hydraulic motor means which operates the rod system of the wheels to be steered. The auxiliary apparatus allows a conventional metering system of relatively small size and capacity to be utilized for heavier vehicles than a system of a particular size or capacity could otherwise be used for. The auxiliary apparatus includes a valve which is operable in response to the pressure differential across the motor ports of the meter of the conventional system to provide greater operating forces for turning the wheels of the vehicle.
A hydrostatic steering system comprising a metering device having inlet and outlet ports and two motor parts, a valve having two operative positions and a neutral position, parallel fluid supply means for said metering device and said valve, motor means connected to said motor ports and to said valve, and pressuredifferential-sensing means connected between said motor ports and said valve for controlling said valve in accordance with the pressure differential between said motor ports.
Claim 2
Dependent Claim
74 words
A hydrostatic steering system comprising a metering device having inlet and outlet ports and two motor parts, a valve having two operative positions and a neutral position, parallel fluid supply means for said metering device and said valve, motor means connected to said motor ports and to said valve, and pressuredifferential-sensing means connected between said motor ports and said valve for controlling said valve in accordance with the pressure differential between said motor ports.
Claim 3
Dependent Claim
29 words
A hydrostatic steering system in accordance with claim 1 in which a first motor is connected to said motor ports and a second motor is connected to said valve.
Claim 4
Dependent Claim
19 words
A hydrostatic steering system according to claim 2 in which said second motor is larger than said first motor.
Claim 5
Dependent Claim
22 words
A hydrostatic steering system in accordance with claim 1 in which separate pump means are provided for said parallel fluid supply means.