Abstract: A cylindrical roller bearing or needle roller bearing for use with a rolling raceway surface is subjected to a carbonitriding treatment to produce a layer containing 30 to 80% retained austenite in the vicinity of its surface that contacts a carburized layer of a rolling raceway surface of a roller bearing. The amount of retained austenite of the surface layer of the roller bearing is increased by about 30%. The surface layer is then heat treated to apply a residual compression stress. The surface then receives surface finishing to produce micro concavo-convex portions in a random direction.

Abstract: A cylindrical roller bearing or needle roller bearing for use with a rolling raceway surface is subjected to a carbonitriding treatment to produce a layer containing 30 to 80% retained austenite in the vicinity of its surface that contacts a carburized layer of a rolling raceway surface of a roller bearing. The amount of retained austenite of the surface layer of the roller bearing is increased by about 30%. The surface layer is then heat treated to apply a residual compression stress. The surface then receives surface finishing to produce micro concavo-convex portions in a random direction.

Abstract: A modulating clutch unit and a torque converter unit are individually made attachable and detachable to provide a power transmission system for a vehicle with enhanced maintainability. For this purpose, in the power transmission system for a vehicle for transmitting power from an engine (1) to a traveling system by way of an input transfer unit (10) for distributing the power to a working machine power output section and a traveling power output section, via a modulating clutch unit (20), a torque converter unit (40), and a transmission (60), the modulating clutch unit (20) and the torque converter unit (40) are respectively placed at the engine (1) side and the transmission (60) side with the input transfer unit (10) therebetween, and are placed coaxially to be attachable and detachable.

Abstract: The present invention is a control device and a control method for a transmission with a clutch, by which the clutch is smoothly coupled without generation of shocks or the like in a vehicle.