Coaxial transmission with plain bearing

Gearbox having

• a tooth carrier for receiving teeth of a gear ring that are disposed about a rotation axis of the gearbox, wherein the teeth are disposed in the tooth carrier so as to be displaceable and guided in the radial direction,
• a cam disk which is rotatable about the rotation axis and for driving the teeth in the radial direction and which has a cam curvature that is variable over the circumference,
• wherein bearing segments which are mounted so as to slide on the cam disk are disposed between the teeth and the cam disk,
• wherein the bearing segments have a contact region which has a concave curvature and is disposed so as to be centric on a running surface that faces the cam disk, wherein the concave curvature is larger than the smallest cam curvature of the cam disk and smaller than the largest cam curvature of the cam disk, and
• wherein the cam disk has exactly one peak having a maximum radial spacing from the rotation axis, and exactly one trough having a minimum radial spacing from the rotation axis, and wherein the concave curvature is smaller than the smallest cam curvature within an angular range, proceeding from the peak, of 5% to 35% of the overall angular range of the cam disk.

Gearbox having

• a tooth carrier for receiving teeth of a gear ring that are disposed about a rotation axis of the gearbox, wherein the teeth are disposed in the tooth carrier so as to be displaceable and guided in the radial direction,
• a cam disk which is rotatable about the rotation axis and for driving the teeth in the radial direction and which has a cam curvature that is variable over the circumference,
• wherein bearing segments which are mounted so as to slide on the cam disk are disposed between the teeth and the cam disk, and
• wherein the bearing segments have a contact region which has a concave curvature and is disposed so as to be centric on a running surface that faces the cam disk, wherein the concave curvature is larger than the smallest cam curvature of the cam disk and smaller than the largest cam curvature of the cam disk, and
• wherein the running surface of the bearing segments in a peripheral region of the running surface is in each case curved convexly in the circumferential direction.