초록 ▼

An improved mechanical-over-hydraulic steering apparatus capable of providing automotive-type steering includes a steering wheel driven input control member, right and left turn control valves, and first and second actuators mounted for rotation along an axis common with the input control member. Ea

An improved mechanical-over-hydraulic steering apparatus capable of providing automotive-type steering includes a steering wheel driven input control member, right and left turn control valves, and first and second actuators mounted for rotation along an axis common with the input control member. Each of the actuators has a cam operatively associated with a cam-following roller assembly that operates the respective control valve. The vehicle has a cross drive mechanism, and the steering apparatus includes an over-center variable displacement steering pump and associated displacement control controllably operated by first and second pilot lines connected to the right and left turn control valves. The steering pump controllably and bidirectionally communicates fluid to a steering motor for the steering input to the cross drive mechanism.

대표청구항 ▼

A vehicle steering apparatus for a vehicle having a steering input control member rotatable about a central axis and a mechanism drivingly connected to left and right ground-engaging members, comprising: pump and motor means for controllably applying torque to the mechanism for steering the vehicle

A vehicle steering apparatus for a vehicle having a steering input control member rotatable about a central axis and a mechanism drivingly connected to left and right ground-engaging members, comprising: pump and motor means for controllably applying torque to the mechanism for steering the vehicle and including a steering pump and a displacement control for the steering pump; control valve means for controllably delivering fluid under pressure to the displacement control, the control valve means including a right turn control valve and a left turn control valve in juxtaposed relation; and steering means for converting the rotational movement of the input control member away from a centered position to linear actuation of a selected one of the control valves, the steering means including a first actuator mounted for rotation about the central axis and operatively connected to the right turn control valve and a second actuator mounted for rotation about the central axis and operatively connected to the left turn control valve.