Variable screw-driven system

摘要

The variable screw-driven system comprises a rotatable drive screw and a nut disposed about the rotatable drive screw interacting with the rotatable drive screw and linearly translatable in response to rotation of the drive screw. A cam assembly includes a cam follower carried to travel in concert with the nut. The cam assembly forms a cam track having a selected profile and within which the cam follower is disposed. During rotation of the drive screw, linear translation of the nut effects tracking of the cam follower within the cam track such that rotation of the nut is effected simultaneously with rotation of the drive screw resulting in an effective variable pitch of the variable screw-driven system. Linear translation of the nut is effected by both rotation of the drive screw and rotation of the nut caused by the cam assembly.