A vehicle height adjustment device includes a changer, a vehicle height controller, and a malfunction detector. The changer is configured to change a relative position of a body of a vehicle relative to an axle of a wheel of the vehicle. The vehicle height controller is configured to change the relative position based on a detection value detected by a detector configured to detect the relative position so as to control a vehicle height, which is a height of the body. The malfunction detector is configured to detect a malfunction in at least one of the changer and the detector, the malfunction causing the vehicle height controller to continue to control the vehicle height to increase.

A vehicle height adjustment device includes a changer, a vehicle speed obtainer, a vehicle height controller, and a malfunction detector. The changer is configured to change a relative position of a body of a vehicle, which includes a plurality of wheels, relative to an axle of each of the plurality of wheels of the vehicle. The vehicle speed obtainer is configured to obtain a vehicle speed, which is a traveling speed of the vehicle. The vehicle height controller is configured to control a vehicle height, which is a height of the body, based on the vehicle speed obtained by the vehicle speed obtainer. The malfunction detector is configured to detect a failure of the vehicle speed obtainer to obtain an accurate value of the vehicle speed.

A vehicle height adjustment device includes a changer, a vehicle height controller, and a malfunction detector. The changer is drivable when supplied with a current and configured to change a relative position of a body of a vehicle relative to an axle of a wheel of the vehicle. The vehicle height controller is configured to perform such control that a target current set based on the relative position is supplied to the changer so as to control a vehicle height, which is a height of the body of the vehicle. The malfunction detector is configured to detect a failure to make the target current flow to the changer.

A plurality of traveling wheels are supported via expandable/contractible tubular support members to a vehicle body frame. A hydraulic operation type vehicle height adjustment mechanism provided for each one of the traveling wheels, the vehicle height adjustment mechanism being capable of switching a relative height of the traveling wheel relative to the vehicle body frame within a predetermined length range by expanding/contracting the support member by a hydraulic cylinder. There are provided a hydraulic control valve capable of controlling feeding state of work oil to each one of the plurality of hydraulic cylinders, a controlling section for controlling an operation of the hydraulic control valve to bring the vehicle body to a target state via vehicle height adjustment by the hydraulic cylinder in response to a change in the posture of the vehicle body and a plurality of accumulators connected oil chambers of the respective plurality of hydraulic cylinders.

A method for pivoting a travel unit on a machine frame of a road milling machine between an outer end position and an inner end position offset toward a center of the machine relative to the outer end position, the road milling machine having a travel mechanism with multiple travel units, of which at least one travel unit is height-adjustable via a lifting column, comprising the steps of positioning a support foot mounted on the machine frame in a ground contact position to support the machine frame, lifting the travel unit, pivoting the travel unit between the outer end position and the inner end position, lowering the travel unit, and positioning the support foot in a stowed position.

A method for pivoting a travel unit on a machine frame of a road milling machine between an outer end position and an inner end position offset toward a center of the machine relative to the outer end position, the road milling machine having a travel mechanism with multiple travel units, of which at least one travel unit is height-adjustable via a lifting column, comprising the steps of positioning a support foot mounted on the machine frame in a ground contact position to support the machine frame, lifting the travel unit, pivoting the travel unit between the outer end position and the inner end position, lowering the travel unit, and positioning the support foot in a stowed position.

A vehicle with an expandable space, may include a fixed floor being a floor of the vehicle; a moving floor slidably inserted into the fixed floor, being slid inside or outside the vehicle by operation of a driving unit, and forming the expanding space outside the vehicle by forming an outside floor connected to the fixed floor when sliding out; and assistant wheel assemblies, each having an assistant wheel that comes in contact with the ground when deployed and that separates from the ground when stowed.

A lightweight suspension upright or knuckle including: a bearing connection interface having a first sleeve element and a second, radially outer, sleeve element and further including a BMC/LFT/DLFT annular body; at least one attachment interface configured to connect the suspension upright or knuckle to a respective control or support element; and a supporting structural body mechanically connecting the bearing connection interface with the at least one attachment interface. The supporting structural body is shaped as a reticular frame including first blade elements chemically and mechanically interconnected to each other and to the outer lateral surface; each blade element consisting in one or more mats or plies of continuous fibers embedded in a polymer matrix, stacked onto one another and that have been compression molded together and with the annular body. Also, a method for obtaining a lightweight suspension upright or knuckle for a vehicle providing a bearing connection interface.

A lightweight suspension upright or knuckle including: a bearing connection interface having a first sleeve element and a second, radially outer, sleeve element and further including a BMC/LFT/DLFT annular body; at least one attachment interface configured to connect the suspension upright or knuckle to a respective control or support element; and a supporting structural body mechanically connecting the bearing connection interface with the at least one attachment interface. The supporting structural body is shaped as a reticular frame including first blade elements chemically and mechanically interconnected to each other and to the outer lateral surface; each blade element consisting in one or more mats or plies of continuous fibers embedded in a polymer matrix, stacked onto one another and that have been compression molded together and with the annular body. Also, a method for obtaining a lightweight suspension upright or knuckle for a vehicle providing a bearing connection interface.

A road work machine comprises a frame, a plurality of ground engaging units, a plurality of vertically moveable legs connecting the plurality of ground engaging units to the frame, respectively, a hydraulic system to control heights of the plurality of vertically moveable legs, pressure sensors for sensing hydraulic pressures in the plurality of vertically movable legs, and a controller configured to, in response to signals received from the pressure sensors, generate a control signal. A method for ride control can comprise adjusting an attitude of the machine in response to sensed pressures.