An auto-leveling drive axle device for a wheel tractor, and leveling method. The device comprises a transmission device and a leveling device. The device of the present invention changes only a vertical position of a drive axle with respect to a wheel, and a wheel shaft distance and wheel center spacing are not changed, thus improving traveling stability of a vehicle.

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 is 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 pneumatic suspension system for a vehicle, in which the pneumatic suspension system includes a supply tank, a first set of air springs positioned on a first side of the vehicle; a second set of air springs positioned on a second side of the vehicle, and a dual-action dynamic valve positioned between the first set of air springs and the second set of air springs. The dual-action dynamic valve is connected to the supply tank, the first set of air springs, and the second set of air springs by a series of air hoses. The dual-action dynamic valve is adapted to supply air to either one of the first set of air springs or the second set of air springs while simultaneously exhausting air from the other one of the first set of air springs or the second set of air springs.

A trailer includes: one or more adjustable suspension actuators; an actuator control module configured to actuate the one or more adjustable suspension actuators; and an adjustment module configured to selectively adjust the one or more adjustable suspension actuators while the trailer is moving based on one or more operating parameters of the trailer.

A pneumatic suspension system for a vehicle, in which the pneumatic suspension system includes a supply tank, a first set of air springs positioned on a first side of the vehicle; a second set of air springs positioned on a second side of the vehicle, and a dual-action dynamic valve positioned between the first set of air springs and the second set of air springs. The dual-action dynamic valve is connected to the supply tank, the first set of air springs, and the second set of air springs by a series of air hoses. The dual-action dynamic valve is adapted to supply air to either one of the first set of air springs or the second set of air springs while simultaneously exhausting air from the other one of the first set of air springs or the second set of air springs.

An embodiment of the present invention discloses a device (100) for connecting a wheel to a vehicle (620) comprising: an input shaft (620) able to be kinematically connected to an engine of a vehicle and having a rotation axis (C); an oscillating support (120) able to be hinged to a vehicle frame (T) along a predetermined horizontal hinge axis (B) parallel to and distanced from the rotation axis (C) of the input shaft (620); an auxiliary shaft (125) rotatably associated to the oscillating support (120) according to a rotation axis (A) parallel to and distanced from the hinge axis (B); a wheel-bearing hub (110) rotatably associated to the oscillating support (120) according to a rotation axis (A) parallel to and distanced from the hinge axis (B); first transmission means (625) able to transmit the motion from the input shaft (620) to the auxiliary shaft (125); second transmission means (130) able to transmit the motion of the auxiliary shaft (125) to the wheel-bearing hub (110).

A vehicle rollover mitigation system may include at least one first sensor to output rollover symptom signals indicating potential rollover of a vehicle, at least one second sensor to output vehicle environment signals indicating a surrounding environment of the vehicle and a controller to output rollover mitigation control signals for mitigating potential rollover of the vehicle based upon the rollover symptom signals and the vehicle environment signals. The vehicle rollover mitigation system may automatically respond to potential rollover by altering a state of an implement coupled to the vehicle.