Abstract: A power shift stage in the driveline of an internal combustion engine, is shifted depending on the load on the engine between at least two rotational speed ratios. A control system automatically controls shifting to improve driving comfort and increase productivity. The control system includes a switch connected to a fuel adjusting element or throttle, an engine rotational speed sensor and a control unit. The control unit automatically shifts the power shift stage in dependence upon the status of the switch and upon the sensed engine speed.

Abstract: A hydraulic controller for an automatic transmission, having a band brake having a large stopping force based on a self-boosting effect against rotation in a self-binding direction and having a comparatively small stopping force against rotation in the unbinding direction, a modulator valve for producing a modulator pressure by reducing a line pressure, a band brake hydraulic servo having a brake engaging hydraulic chamber and a brake releasing hydraulic chamber. A line pressure is supplied to the band brake hydraulic servo to stop rotation in the self binding direction when a predetermined transmission speed is selected. The line pressure is also supplied the band brake hydraulic servo to stop rotation in the unbinding direction when another transmission speed is selected. A modulator pressure is supplied to the brake engaging hydraulic chamber to stop the rotation in the self-binding direction of the band brake and to allow the rotation in the unbinding direction when an intermediate speed is selected.

Abstract: A traction drive unit for transmitting rotary motion about an axis of rotation has an inner sun roller, an outer ring and planet rollers arranged in two circular rows between the sun roller and outer ring. The sun roller takes the form of a double cone having outwardly presented raceways which taper downwardly toward each other and thrust ribs that project radially beyond the large ends of the raceways. The outer ring has two inwardly presented tapered raceways which taper downwardly toward the ends of the ring. The inner planet rollers are tapered rollers which are organized in two circular rows along the raceways of the sun member. The outer planet rollers have crowned peripheral surfaces which contact the tapered raceways of the outer ring and the tapered side surfaces of the inner planet rollers. They are captured axially by reason of the taper of the outer raceways and inner planet rollers. The outer rollers revolve in pairs about axles which are fitted to end disks.