Driving hub for a vehicle, particularly a bicycle, with an infinitely variable adjustable transmission ratio

A driving hub for a vehicle, particularly a bicycle, comprising

• a hub axle (1, 2) which establishes an axis (4) of the hub,
• a hub sleeve (9) which equiaxially encloses and is rotatable in relation to the hub axle (1, 2),
• a driver (13) mounted to rotate in relation to the hub sleeve (9) and the hub axle (1, 2),
• a friction gear disposed inside the hub sleeve (9) in the path of force between the driver (13) and the hub sleeve (9),
• at least one coupling arrangement (23) which, when the drive is being provided by the driver (13), closes the path of force between driver (13) and hub sleeve (9) and opens the path of force when the driver (13) is not driving,
• a control arrangement (50) which can be actuated from outside, for the infinitely variable adjustment of the transmission ratio of the friction gear (17),
• wherein the friction gear is constructed as a ball friction gear (17), comprising
• two axially oppositely disposed rings, a driving ring (25) and a driven ring (27),
• distributed in the peripheral direction of the rings (25, 27) and connecting the rings to one another frictionally, a plurality of friction balls (35) which are rotatably mounted by means of ball spindles (37) and
• rotationally rigidly connected to the hub axle (1, 2) a friction ball carrier on which the friction balls (35) with their ball spindles (37) are mounted to pivot in a plane containing the axis (4) of the hub,
• wherein the driving ring (25) and the driven ring (27) are in frictional contact with the friction balls (35) on the side of the friction balls (35) which faces away from the axis (4), and wherein the control arrangement (50) is constructed for joint pivoting of the ball spindles (37).