Patent ID: 6186020
Filing Date: 2001-02-13
Classification: F16H,Y10T

Abstract:
A device having a motor for converting rotary motion into axial motion comprising:a) a hollow cylindrical thrust element;b) a carrier having an axis and disposed within said thrust element;c) at least two planet rollers held circumferentially at equal spacings and being axially fixed and rotatably mounted within said carrier, and having axes parallel to the direction of drive of said thrust element extending through the centers of rotation of said rollers;d) a drive shaft connected to the motor and to said carrier for rotating said planet rollers, about said carrier axis;e) drive grooves disposed on said planet rollers in which each drive groove lies in a plane perpendicular to said axes of said planet rollers; andf) at least one thread-like groove formed on the interior surface of said thrust element for engaging with the drive grooves of said planet rollers, wherein when said planet rollers rotate, they drive said thrust element axially;g) a cylindrically shaped bearing element axially fixed inside said rollers wherein said bearing element includes circumferential grooves.