Patent ID: 6520883
Filing Date: 2003-02-18
Classification: F16H

Abstract:
An eccentric gear for transferring a torque or a force between rotatable elements (2, 3), one of which is driving (2) and another is driven (3), comprising two co-operating gear rings (6, 7) with differently large pitch diameters, of which a first, outer ring (6) of a largest diameter has a certain number of inwardly directed teeth, and a second, inner ring (7) has a smaller number of outwardly directed teeth, of which only some engage with the outer gear ring (6), the inner gear ring (7) being eccentrically movable and rollable relative to the outer (6), the inner gear ring being connected to an elongated body, whose geometrical axis of rotation (A) is oblique relative to a geometrical axis of symmetry (B) through the center of the outer gear ring (6) and which during the generation of the inner gear ring against the outer gear ring is subjected to a nutating motion, during which the axis of rotation of the body moves as a generatrice along the envelope surface of an imaginary cone, around a nutation point (C) that is axially distanced from the gear rings (6, 7), said body being, in a region that is substantially equally distanced from the gear rings as the nutation point, co-rotatively connected to the driven element (3), and the gear change between said elements being dependent on the total number of teeth in the respective gear rings, the elongated body being a rod (13) which is introduced into a larger, long hole (14) in the driven element (3) and which in the region of a free end that is distal from the inner gear ring, is co-rotatively connected to the driven element (3) at a point (15) located within the hole (14).