A work vehicle including: an engine mounted on a traveling body; a straight-traveling system transmission path including a first stepless transmission device; and a turning system transmission path including a second stepless transmission device, The work vehicle combines an output of the straight-traveling system transmission path and an output of the turning system transmission path to drive left and right traveling units. The work vehicle further includes: control sections that control the output of the straight-traveling system transmission path and the output of the turning system transmission path in cooperation with each other; and a driving force blocking mechanism that blocks a driving force transfer from the straight-traveling system transmission path. When the driving force transfer from the straight-traveling system transmission path is blocked by the driving force blocking mechanism, the mutually reverse rotation operations of the left and right traveling units is inhibited.

A resilient power device is adapted to drive a transmission rod of a vehicle, and includes a housing, a rotary shaft adapted to extend and be spaced apart from the transmission rod along a first axis, a power release unit including a first rod and a second rod that extend and are spaced apart from each other along a second axis parallel to the first axis, a power storage clutch adapted to be connected between the transmission rod and the rotary shaft, a power release clutch connected between the first and second rods, a first gear unit mounted to the first rod and the transmission rod, a second gear unit mounted to the rotary shaft and said second rod, and at least one resilient member connected between the housing and the rotary shaft.

A drive arrangement in a vehicle having front and rear ground engaging means and steering means, has a differential transmission, a differential lock, a planetary final drive on each side of the vehicle and a motor acting onto one member of the planetary final drives. The motor is controlled depending on the steering angle such, that it provides for a difference in the drive speed on the left and the right side.

A regenerative differential includes torque members, and a gear assembly that includes a primary gear set and a plurality of secondary gear sets. The primary gear set is configured to transfer torque between the secondary gear sets and first and second torque members. The first secondary gear set transfers torque between the primary gear set and a third torque member. The second secondary gear set transfers torque between the primary gear set and a fourth torque member. The gear assembly is configured to maintain a fixed relationship between torque member rotation velocities 1, 2, 3, and 4, such that 3=M.sub.L.sub.2+.sub.L.sub.1, .sub.4=M.sub.R.sub.2+A.sub.R.sub.1, M.sub.L and .sub.L are functions of a ratio of the first secondary gear set, and M.sub.R and .sub.R are functions of k.sub.R of a ratio of the second secondary gear set.

In an all-wheel drive arrangement with low input torque especially for the skid-steer loaders controlled by a control unit, made up of battery, frequency converter, electric joystick and/or electro-hydraulic switchgear, both sides of the vehicle control include at least two wheels, each wheel connected to a planetary gearing. The gearing equipped with the infinite gear member (e.g. belt, chain) transfers the torque from the electric motor to each wheel on one side of the vehicle controlled, whereby the planetary gear directly drives the particular wheel.

A resilient power device is adapted to drive a transmission rod of a vehicle, and includes a housing, a rotary shaft adapted to extend and be spaced apart from the transmission rod along a first axis, a power release unit including a first rod and a second rod that extend and are spaced apart from each other along a second axis parallel to the first axis, a power storage clutch adapted to be connected between the transmission rod and the rotary shaft, a power release clutch connected between the first and second rods, a first gear unit mounted to the first rod and the transmission rod, a second gear unit mounted to the rotary shaft and said second rod, and at least one resilient member connected between the housing and the rotary shaft.

A control system for a machine having a support structure, a track roller frame assembly coupled to the support structure and a machine body coupled to the support structure, the electronic control system including a lateral position sensor that is coupled to the track roller frame assembly and is configured to detect a lateral position of the track roller frame assembly relative to the support structure, an angular position sensor that is coupled to the machine body and is configured to detect an angular position of the machine body relative to the support structure, and a processor configured to determine a parameter for the tracked machine based on the detected lateral position of the track roller frame assembly, the detected lateral position indicative asymmetrical positioning a track roller frame assembly, and the detected angular position of the machine body, and provide feedback based on the parameter for the tracked machine.

A method of controlling a transmission includes providing an input, an output, a controller, a control system, a hydrostatic unit, and a geartrain. The geartrain includes a direct drive pivot clutch and a steer drive geartrain. The method also includes receiving a pivot command by the controller from a shift selector, where the command indicates the shift selector is in a pivot position. The method further includes engaging the direct drive pivot clutch, decoupling the hydrostatic unit from a torque path defined between the input and the output, and coupling the input and the output to one another via a second torque path. The second torque path is defined through the direct drive pivot clutch and the steer drive geartrain. The transmission is controllable in a direct drive steer operation.

A transmission for a vehicle, particularly a skid-steered vehicle, that employs motive power from a prime mover delivered through an input shaft to drive left and right drive shafts at a nominal speed and input power from an electric motor to vary the speed of the left and right drive shafts according to steering commands from a steering control structure. The speed of the left and right drive shafts is directly related to a speed of the input shaft and the nominal speed of the left or right drive shaft is varied upwardly or downwardly by a ratio of the speed of the steering shaft via a speed varying structure. The speed of the left and right drive shafts is simultaneously varied in opposite directions (i.e. upwardly and downwardly) relative to the nominal speed by an equal number of rotations.

A system and method are provided for assisting a machine operator in controlling a work tool of the machine. In an embodiment, the work tool is set at a first height and the machine is travelling at a first machine speed, resulting in a first work tool or machine load. Based on these factors, a first work tool control mode or second work tool control mode is chosen. In the first work tool control mode, the work tool is manually controlled within a load limit and a work tool height limit, whereas in the second work tool control mode, the work tool load is controlled toward the first work tool load. Based on operator inputs and machine state, as well as other factors such as ground surface, the machine may switch between control modes, or out of automatic work tool control entirely.