Adjusting device with a CVT planetary roller transmission
View Patent ↗An adjusting device including a CVT planetary roller transmission having two axially-spaced sun wheels that are rotatable about a common axis of rotation and at different speeds of rotation. Planet wheels contact and ride against peripheral surfaces of each of the sun wheels, and an axially displaceable ring wheel lies radially outwardly of the sun wheels and engages a peripheral groove formed in the sun wheels. When the ring wheel is axially displaced relative to the sun wheels the axes of rotation of the planet wheels tilt relative to the sun wheel axis resulting in a difference in the rotational speed of the sun wheels changes. The device can be employed as an adjusting device for adjusting the rotational speed of connected units, and also as a drive line component having a variable transmission ratio and situated in a power train of a motor vehicle.
1. An adjusting device with a CVT planetary roller transmission which has two sun wheels that are rotatable at an axial distance from each other around the same axis of rotation at different speeds, designed with sun wheel peripheral surfaces, a ring wheel with a radially inner peripheral surface and planet wheels with planet wheel peripheral surfaces that are in frictional contact with the inner peripheral surface and the sun wheel peripheral surfaces, wherein the surfaces that are in frictional contact with each other are shaped so that when there is an axial shift of the ring wheel relative to the sun wheels and an accompanying tilting of the axes of rotation of the planet wheels a difference in speed of rotation between the sun wheels changes, wherein the first sun wheel is rotationally drivable by a drive engine, the ring wheel is axially movable by an actuator and is rotationally drivable by an electric motor, and the second sun wheel rotationally drives an output shaft.
2. An adjusting device in accordance with claim 1 , wherein a clutch is situated between the drive engine and the first sun wheel.
3. An adjusting device in accordance with claim 1 , wherein the rotation of the ring wheel and of the electric motor is blockable.