An electromechanical dual steering system for a utility vehicle includes two steering systems, each having a drive unit for actuating one steering linkage each for wheels of the utility vehicle. Each drive unit has an electric motor. The dual steering system has a main power supply for supplying the electric motors with energy. The electromechanical dual steering system is characterized in that the dual steering system has at least one emergency power supply for supplying at least one electric motor with energy in the event that the main power supply fails.

A working machine including: a ground engaging structure having front steerable wheels and rear steerable wheels; a front steering actuator for adjusting the steering angle of each of the front wheels; a rear steering actuator for adjusting the steering angle of each of the rear wheels; an operator steering device configured to provide a steering demand; and, an operator steering mode selector configured to select either a two wheel steer mode or a four wheel steer mode; wherein the front and rear steering actuators are selectively operable in accordance with the steering demand and selected two wheel steer mode or four wheel steer mode, wherein a steering ratio, which is the ratio of steering demand to turning angle of the front wheels and/or rear wheels is different in the two wheel and four wheel steer modes.

A lift truck (10) has a pair of wheel assemblies (21) each of which is rotatable about a pivot point (24) relative to the chassis (12) of the truck through at least 90 degrees between a forward mode and a sideward mode. The wheel (18,20) of each assembly is laterally offset from the assembly's pivot point (24), causing the wheel to describe an arcuate path over the ground as it transitions between the forward and sideward modes. During the transition, an actuator acts on each wheel assembly (21) to pivot the assembly about the pivot point (24), while drive is applied to the wheel to positively drive the wheel along the arcuate patch at a speed that matches the pivotal rotation caused by the actuator. This positive drive imparted to the wheels (18,20) during the transition prevents the truck from rolling if it is located on a slope during the change in orientation of the wheel assemblies (21).

An on-board electronics system of an aerial work platform moves the wheels between a retracted and extended position by pivoting a respective arm. The method comprises the following successive steps: a) orienting each wheel tangentially to the pivoting path of the corresponding arm, b) moving the wheel by pivotally actuating the corresponding arm, and c) reorienting the wheel so as to enable another translation of the aerial work platform. The steps are performed in different orders between the wheels so that at any time at least one of the following conditions is complied with: the brake system of at least one wheel is active, at least one wheel is rotated by a motorised drive, the orientation of the wheels relative to one another prevents any translation of the aerial work platform (1) on the ground as a result of gravitational force.

A construction vehicle includes two drive modules, which are releasably connected to one another, each comprising at least one driven axle, wherein at least one of the two drive modules comprises an axle having steerable wheels. The construction vehicle also includes at least one cab module, which is connectable to each of the two drive modules, and a controller for the two drive modules, which is connected to the at least one cab module. The drive modules comprise a first mechanical connecting arrangement, via which they are connected, and wherein the cab module is connected to any one of the two drive modules via a second mechanical connecting arrangement. Due to its modular design, a construction vehicle of this kind can be adapted in a quite individual manner to a variety of construction site needs.

A chassis assembly of a robotic vehicle, comprising a wheel assembly, including: a first front wheel and a first back wheel, located on one side of the chassis assembly; a second front wheel and a second back wheel, located on another side of the chassis assembly; a steering assembly, including: a first actuator motor associated with one of the first front wheel and the first back wheel; a second actuator motor associated with one of the second front wheel and the second back wheel; a linking assembly, including: a linking structure coupling the first front wheel and the first back wheel for translating rotational motion of the one of the first front wheel and the first back wheel to the other one of the first front wheel and the first back wheel; another linking structure coupling the second front wheel and the second back wheel for translating rotational motion similarly.

An axle structure is applied to a lawn mowing robot, which includes a device body and a wheel body. The axle structure includes a support beam, a first axle housing, a connecting beam, and a second axle housing. The support beam is provided within the first axle housing and is configured to connect to the device body. The connecting beam is provided within the second axle housing and is rotatably connected to the support beam about a vertical direction. A lower end of the connecting beam is configured to connect to the wheel body.