A steering drive system for a wheel side steered vehicle includes a coupling element couplable to output drives of the vehicle in order, when an amount of a superposition rotational speed of the coupling element is greater than zero, to provide at the output drives, which are driven at a basic rotational speed on the basis of a travel drive system of the vehicle, for steering the vehicle a superposition rotational speed which is to be superposed on the basic rotational speed. The system further includes at least one first electric machine whose rotational speed can be variably set or controlled, with a power summation and/or power branching unit, wherein a first connection of the power summation and/or power branching unit is coupled to a shaft which can be coupled, in particular via a defined transmission ratio, to a shaft of the travel drive system. A second connection of the power summation and/or power branching unit is coupled to the at least one first electric machine, and a third connection of the power summation and/or power branching unit is coupled to the coupling element, in particular via at least one defined transmission ratio.

A steering drive system for a wheel side steered vehicle includes a coupling element couplable to output drives of the vehicle in order, when an amount of a superposition rotational speed of the coupling element is greater than zero, to provide at the output drives, which are driven at a basic rotational speed on the basis of a travel drive system of the vehicle, for steering the vehicle a superposition rotational speed which is to be superposed on the basic rotational speed. The system further includes at least one first electric machine whose rotational speed can be variably set or controlled, with a power summation and/or power branching unit, wherein a first connection of the power summation and/or power branching unit is coupled to a shaft which can be coupled, in particular via a defined transmission ratio, to a shaft of the travel drive system. A second connection of the power summation and/or power branching unit is coupled to the at least one first electric machine, and a third connection of the power summation and/or power branching unit is coupled to the coupling element, in particular via at least one defined transmission ratio.

Some embodiments are directed to a controlled differential adapted to couple two shafts and steer input, such as those provided in a drive configuration for a skid steered vehicle, the controlled differential including a pair of planet carriers arranged to turn with respective shafts; a pair of ring gears interconnected by a cross-shaft such that the ring gears rotate in common; planet gears and a pair of sun gears, the sun gears being coupled to at least one steer motor to enable rotation of the sun gears in mutually opposite senses upon input from the steer motor.

Some embodiments are directed to a controlled differential adapted to couple two shafts and steer input, such as those provided in a drive configuration for a skid steered vehicle, the controlled differential including a pair of planet carriers arranged to turn with respective shafts; a pair of ring gears interconnected by a cross-shaft such that the ring gears rotate in common; planet gears and a pair of sun gears, the sun gears being coupled to at least one steer motor to enable rotation of the sun gears in mutually opposite senses upon input from the steer motor.

An electric drive retrofit kit includes a rear entry electric drive motor module that includes an electric drive planetary gear assembly and a second electric drive planetary gear assembly which can be inserted into a rear final drive cavity of a frame housing for a tracked tractor with a high track drive. The electric drive retrofit kit may further include a generator, a cooling package, an additional water pump, a steering pump, a steering motor, power inverters with control modules, and electric cables.

An electric drive retrofit kit includes a rear entry electric drive motor module that includes an electric drive planetary gear assembly and a second electric drive planetary gear assembly which can be inserted into a rear final drive cavity of a frame housing for a tracked tractor with a high track drive. The electric drive retrofit kit may further include a generator, a cooling package, an additional water pump, a steering pump, a steering motor, power inverters with control modules, and electric cables.

A drive mechanism (10) for a tracked vehicle. The drive mechanism includes an electric drive motor (1) for supplying drive power and an electric steering motor (3) for supplying steering power. Mechanical drive elements (4, 5) transmit reactive power between a right-hand drive side (12) and a left-hand drive side (11) when driving around a curve or bend. An electric auxiliary motor (2) selectively assists either the drive motor (2) or the steering motor (3).

A drive mechanism (10) for a tracked vehicle. The drive mechanism includes an electric drive motor (1) for supplying drive power and an electric steering motor (3) for supplying steering power. Mechanical drive elements (4, 5) transmit reactive power between a right-hand drive side (12) and a left-hand drive side (11) when driving around a curve or bend. An electric auxiliary motor (2) selectively assists either the drive motor (2) or the steering motor (3).

A skid-steered amphibious vehicle includes ground engaging members, an electric drive motor, and an electric steer motor. The electric drive motor and electric steer motor are drivingly coupled to a transmission for driving and steering the vehicle. The vehicle also has a zero turn selector and the zero turn selector has a first configuration and a second configuration. The vehicle includes at least three operation modes, including: a park mode, a forward mode, and a reverse mode. When the vehicle is in the forward mode and the zero turn selector is in the first configuration, the controller permits the vehicle to conduct a zero turn and when the vehicle is in the forward mode and the zero turn selector is in the second configuration, the controller does not permit the vehicle to conduct a zero turn.

A skid-steered amphibious vehicle includes ground engaging members, an electric drive motor, and an electric steer motor. The electric drive motor and electric steer motor are drivingly coupled to a transmission for driving and steering the vehicle. The vehicle also has a zero turn selector and the zero turn selector has a first configuration and a second configuration. The vehicle includes at least three operation modes, including: a park mode, a forward mode, and a reverse mode. When the vehicle is in the forward mode and the zero turn selector is in the first configuration, the controller permits the vehicle to conduct a zero turn and when the vehicle is in the forward mode and the zero turn selector is in the second configuration, the controller does not permit the vehicle to conduct a zero turn.