Abstract: A work machine includes an internal combustion (IC) engine having an output, and an infinitely variable transmission (IVT) coupled with the IC engine output. The IVT includes a hydraulic module and a mechanical drivetrain module. A pressure transducer is associated with and provides an output signal representing a hydraulic pressure within the hydraulic module. At least one electrical processing circuit is configured for controlling the IC engine output, dependent upon the output signal from the pressure transducer.

Abstract: A continuously variable transmission including two pairs of conical disks of which one disk of each pair is axially movable toward and away from the other disk and having an endless loop member in the form of a belt that passes around each pair of disks and transfers torque between the pairs of disks. The axially movable conical disk includes a contact pressure chamber to move the disk axially by the application of hydraulic pressure. The movable disk also includes an integrated torque sensor that is operative for controlling the contact pressure between the disks of a pair of disks and the endless loop member as a function of the torque.

Abstract: A power train of an automatic transmission for a vehicle, which automatically and successively accomplishes a change of speed in a low speed range where driving time is short and a shift impact is severe, directly connects a transmission in high speed range where a high mechanical efficiency of power transmission is required, thereby reducing the shift impact, improving a specific fuel consumption, minimizing the number of one-way clutches for the shift impact and being simply designed.

Abstract: Disclosed is a power train of an automatic transmission for a vehicle, which includes a device for making a continuous shifting operation in the low speed region, directly connecting the power train with the output shaft of the engine so as to reduce the shifting shock impulses, and reducing the number of the one-way clutches so as to simplify the whole structure.

Abstract: A power train of an automatic transmission for a vehicle includes a fluid torque converter receiving power from the engine and a first brake for locking a second ring gear of a first speed changing part so that the output of a second sun gear receiving power from a turbine of the torque converter becomes the first forward speed. A second clutch is provided for transmitting power of a stator in the torque converter to a transfer drive gear in addition to the first speed level so that the speed is automatically and continuously changed form the time that power of the torque converter is reduced since the power of the torque converter is transmitted to the stator. A first clutch is provided for performing the fixing mode of the second speed level such that the output power of the first speed changing part is the same as the input power of the engine, because the output of the engine is directly transmitted to the first ring gear of the first speed changing part through the first clutch.