A steering wheel system for a semi-trailer is described. The system uses a retractable encoded system releasably connected to a kingpin, a mechanical steer driving system translating the rotation of the kingpin to a hydraulic system, and a non-circular cogged system driven by the hydraulic system adapted to steer the wheels. A hydraulic generator system powered by the rotation of the wheels is used to decrease the electric energy required by the hydraulic system. Other improvements are also present to increase security, decrease weight and improve time expectancy of the components.

A steering wheel system for a semi-trailer is described. The system uses a retractable encoded system releasably connected to a kingpin, a mechanical steer driving system translating the rotation of the kingpin to a hydraulic system, and a non-circular cogged system driven by the hydraulic system adapted to steer the wheels. A hydraulic generator system powered by the rotation of the wheels is used to decrease the electric energy required by the hydraulic system. Other improvements are also present to increase security, decrease weight and improve time expectancy of the components.

A trailer assembly includes first and second axles supporting first and second wheels which are coupled to first and second actuators of a steering system. The steering system includes a control circuit connected to the actuators and the control circuit includes a driving device configurable in a low speed maneuvering mode with: a synchronized sub-mode in which the actuators can be actuated in a synchronized manner to steer the wheels in a synchronized manner, and a desynchronized sub-mode in which the first and second actuators can be actuated individually and independently to steer only the first wheels or only the second wheels. A control device is connected to the driving device to: select one of the sub-modes in the low speed maneuvering mode, and select an actuation either of the first actuator or of the second actuator, in the desynchronized sub-mode.

A trailer assembly with improved lateral support structure and steering system control of the axial wheels on a front elongated trailer and a rear elongated trailer to remain in a collinear following configuration to carry elongated loads extending over the extended lengths of the combination of the front elongated trailer and the rear elongated trailer and allow ready turning control.

A trailer assembly with improved lateral support structure and steering system control of the axial wheels on a front elongated trailer and a rear elongated trailer to remain in a collinear following configuration to carry elongated loads extending over the extended lengths of the combination of the front elongated trailer and the rear elongated trailer and allow ready turning control.

A swivel trailer is described that can include a swivel hitch and swivel axle configuration which prevents a vehicle and trailer from jackknifing.

A swivel trailer is described that can include a swivel hitch and swivel axle configuration which prevents a vehicle and trailer from jackknifing.

A tow configuration may include a tow vehicle and first and second trailers. The intermediate trailer hitch angle with the tow vehicle is controlled with one objective being to improve the off-tracking performance of the other trailer. The hitch angle may be controlled through steerable wheels at the intermediate trailer or through wheel differential steering at the intermediate trailer.

A header including a front and rear wheel assembly, each assembly having an axle and two wheels. Each wheel assembly is coupled to the main body of the header by an actuating system having an actuator mechanism for actuating a swivel movement of the axle and the wheels to bring the wheel assembly to or from a road transport position. The front and rear wheel assemblies are equipped with tie rod arrangements for steering the header when it is transported on the road. The wheels of the wheel assemblies are operated as caster wheels. The tie rod arrangement of the front wheel assembly is coupled to a pivotable base connected to, or connectable to, a drawbar. The wheel assemblies have respective actuators which are synchronized so as to synchronize the position of the front and rear wheels.

A header for a crop harvesting machine includes front and rear wheel arrangements that pivot about respective upright axis between a field orientation and a perpendicular transport orientation, while having respective suspensions arrangements movable between different suspended heights. A biasing spring provides lift assist to carry weight of the wheel arrangement during adjustment of the suspension elevation while being isolated from the suspension once set at any one elevation. The front wheel arrangement includes an anti-rotation latch that locks the front wheel in the field orientation automatically upon disconnection of a hitch arm. A second wheel of the rear wheel arrangement can be held in a raised position relative to a first wheel in a field orientation. Load bearing surfaces between the suspended rear wheels and the header frame abut one another when latching to the header frame to isolate the suspension from the header frame in the transport orientation.