초록 ▼

A steering system for an articulated vehicle having one axle mounted thereon in a wagon-steer mode in addition to the conventional articulated-steer mode. A steering control valve, which is responsive to the movement of a manual steering control element, is ported to admit hydraulic fluid sequential

A steering system for an articulated vehicle having one axle mounted thereon in a wagon-steer mode in addition to the conventional articulated-steer mode. A steering control valve, which is responsive to the movement of a manual steering control element, is ported to admit hydraulic fluid sequentially, first to a pair of wagon-steer cylinders and then to a pair of articulated-steer cylinders in both left and right steering control. The steering of the vehicle is initially through the wagon-steer movement of the one axle to facilitate high speed handling, which requires relatively small directional changes in the steering system, and is secondly through the articulated-steer movement in sequence to the wagon-steer movement to facilitate low speed maneuvering, which requires large directional changes in the steering system.

대표청구항 ▼

A steering system for an articulated vehicle having an axle mounted thereon in wagon-steer mode, comprising: a pair of articulated steer cylinders operatively mounted on said vehicle for articulated steering movement of the vehicle; a pair of wagon-steer cylinders operatively mounted on said vehicle

A steering system for an articulated vehicle having an axle mounted thereon in wagon-steer mode, comprising: a pair of articulated steer cylinders operatively mounted on said vehicle for articulated steering movement of the vehicle; a pair of wagon-steer cylinders operatively mounted on said vehicle for steering movement of said axle mounted in wagon-steer mode for about 3°left and right movement; a source of pressurized hydraulic fluid flow for actuation of said steering cylinders; a pilot valve and a manually controlled steering member for moving the pilot valve selectively in left and right steering control; a steering control valve for controlling hydraulic flow to and from said steering cylinders, hydraulic connection means providing for movement of the control valve responsive to movements of said pilot valve; hydraulic flow connections from said source through said steering control valve to said cylinders, said control valve being ported to admit hydraulic fluid sequentially first to said wagon-steer cylinders and only then to said articulated steer cylinders in both left and right steering control, whereby steering of the vehicle in both left and right directional steering is initially through wagon-steer movemement of said wagon-steer mode axle facilitating high speed handling of the vehicle with relatively small directional changes.