TORQUE TRANSMITTING BODY FOR TRACTION DRIVE TRANSMISSIONS AND NORMAL FRICTION FORCE DEVELOPING METHOD

摘要

A nutating traction drive in which external rolling surfaces on a one-piece biconical body are retained against axially spaced internal ring surfaces at diametrically opposite points of contact by a mechanism acting between a body which is rotatable on the axis of the ring surfaces or a first axis and which carries the biconical body on a second axis inclined with respect to and intersecting the first axis at a point of axes intersection located midway between the ring surfaces and points of contact. The mechanism includes a pivotal member having a fulcrum point eccentric from the first axis or displaced from a plane containing both the first and second axes so that a torque reaction to rotation of the carrying body by the biconical body results in a force attempting to increase the angle between the first and second axes. A preloading device acting to rock the pivot member in one direction provides a preload biaz of the rolling surfaces against each other whereas an unloading device operating to swing the pivot member in the opposite direction results in a removal of normal friction force between the engaged rolling surfaces.