A milling machine may have a frame, ground engaging tracks that support the frame, and an actuator that adjusts a height of the frame relative to the track. The milling machine may have a control valve that selectively controls a flow of fluid into or out of the actuator based on the current supplied to the control valve. The milling machine may have a controller that determines the amount of current required to operate the actuator at a nominal actuator velocity and supplies that current to the control valve. The controller determines a measured actuator velocity based on a time required to extend or retract the actuator by a predetermined length, and adjusts the amount of current based on the measured and nominal actuator velocities. The controller also supplies the adjusted amount of current to the control valve to adjust the height of the frame relative to the track.

Example apparatuses and techniques are disclosed for towing tracked vehicles at high speeds without various deficiencies and for allowing a vehicle to be configured to extend supplemental wheels from a storage configuration into a ground support configuration in which the vehicle is able to make use of the supplemental wheels for additional ground support.

A milling machine may have a frame, a milling drum attached to the frame, and ground engaging tracks that support the frame and propel the milling machine in a forward or rearward direction. The milling machine may have height adjustable actuators connecting the frame to the tracks. Each actuator may have a cylinder attached to the frame, a piston slidably disposed within the cylinder, and a rod connected at a first end to the piston and connected to a track at a second end. The milling machine may have a tank storing hydraulic fluid and a fluid conduit connecting the tank to the cylinder. The milling machine may have a control valve selectively controlling a flow rate of the hydraulic fluid in the fluid conduit. The milling machine may also have a controller that determines a height of the frame relative to the ground surface based on the flow rate.

A radio-controlled vehicle having a frame, a left undercarriage and a right undercarriage; wherein the frame has a front guide and a rear guide, each configured to house a respective cylinder; each undercarriage having a front slide and a rear slide, which are connected in a sliding manner to the front guide and to the rear guide, respectively; wherein each cylinder is configured to selectively vary the distance between the longitudinal axis of the frame and the longitudinal axis of each undercarriage; wherein each undercarriage comprises an anti-derailment plate.

A milling machine may have a frame, first and second ground engagement members connected through respective, vertically adjustable leg columns to a front end of the frame, and third and fourth ground engagement members connected through respective, vertically adjustable leg columns to a rear end of the frame. Each vertically adjustable leg column includes a hydraulic cylinder connecting the frame and the associated ground engagement member. A milling drum is attached to the frame between the front and rear ends. At least one pair of the leg columns connected to the front end of the frame or the leg columns connected to the rear end of the frame includes an accumulator associated with each of the at least one pair of leg columns, a fluid conduit fluidly connecting a bore end of each of the hydraulic cylinders to the associated accumulator, and a control valve disposed in the fluid conduit and configured to control a flow of fluid between the hydraulic cylinders and the associated accumulators.

The present invention relates to a vehicle (10) comprising an arrangement for determining the weight of load on the vehicle, said vehicle (10) comprising: a vehicle body (11, 12); at least two ground support assemblies (30; 130; 230) arranged to support said vehicle body (11, 12), each ground support assembly comprises a support beam (31; 131; 231) arranged to support at least two wheels (132; 232), or track road wheels (32), at least one sprocket (33) and an endless track (34) arranged around the track road wheels (32) and the sprocket (33); a suspension device (40; 140; 240) for suspension of each of said ground support assemblies (30; 130; 230) to said vehicle body (11, 12), said suspension device (40; 140; 240) is arranged to allow a movement of the ground support assembly (30; 130; 230) relative to the vehicle body (11, 12) in a substantially vertical plane extending in the longitudinal direction of said ground support assembly (30; 130; 230); and a control unit (70), wherein said suspension device (40; 140; 240) comprises sensors arranged to measure the loads on the respective ground support assembly (30; 130; 230) and forward the information to the control unit (70) where the weight of the vehicle load is determined based on the information from the sensors.

A method for mounting a track assembly to a vehicle comprises: pivotally connecting a frame of the track assembly to a distal end portion of an A-arm of the vehicle for permitting rotation of the track assembly about a steering axis; inserting a fastener through a fastener aperture defined in the distal end portion of the A-arm; and fastening an anti-rotation device of the track assembly to the distal end portion of the A-arm with the fastener, the anti-rotation device being connected to the frame. A suspension and track assembly for a vehicle is also disclosed.

The present invention relates to a suspension system (S; S1; S2) fora tracked vehicle (V; V1; V2). Said tracked vehicle comprises a vehicle body (4), a pair of opposite track assemblies (T1, T2), the respective track assembly comprising a plurality of road wheels (2) and an endless track (3) disposed around said wheels. Said suspension system comprises a road wheel arm (20) having a wheel axle portion (22) configured to support a road wheel of the vehicle and a pivot axle portion (24), the road wheel arm (20) being pivotably journalled at said pivot axle portion (24) to a support portion (30) configured to be fixed to the vehicle body (4). The suspension system comprises a torsion bar (40) having a first end portion (42) and an opposite second end portion (44), the first end portion (42) being connected to the support portion (30). The suspension system comprises an adjustment device (100) connected to the second end portion (44) of the torsion bar (40), the adjustment device being configured to adjust the torque on the torsion bar so as to adjust the height of the vehicle body relative to said pair of track assemblies. The invention also relates to a tracked vehicle with such a suspension system and a method for controlling such a suspension system.

A method for setting the lifting position of a machine frame of a ground milling machine, which machine frame is connected via lifting means to movement means, and to a ground milling machine.

A machine for road work can comprise a frame, a plurality of ground engaging units, a plurality of vertically moveable legs, each leg connecting one of the plurality of ground engaging units to the frame, a pair of spatial sensors, such as global navigation satellite system (GNSS) sensors, and a controller configured to, in response to a three-dimensional signal received from each of the spatial sensors, activate at least some of the plurality of vertically moveable legs.