Patent ID: 6261199
Filing Date: 2001-07-17
Classification: F16H

Abstract:
A hypocycloid non-back drive comprising: a stationary housing having opposite ends, a first end plate secured to one end of the housing, a second end plate secured to the other end of the housing, said housing having an internal spur gear, said internal spur gear having a circular arrangement of inwardly directed spur gear teeth, a first shall rotatably mounted on the first end plate, a second shaft rotatably mounted on the second end plate, said first and second shafts having axially aligned rotational axes, a ring gear having a circular arrangement of external spur gear teeth, said ring gear having a diameter smaller than the diameter of the circular arrangement of the teeth of the internal spur gear whereby a portion of the external spur gear teeth mesh with a portion of the internal spur gear teeth, said ring gear having a continuous and smooth cylindrical inside surface concentric with the circular arrangement of the external spur gear teeth, a radially extended arm means secured to the first shaft engageable with the cylindrical inside surface of the ring gear and movable with the first shaft, eccentric means mounted on the first shaft, said arm means and eccentric means extended in the same outward radial direction, means mounting the ring gear on the eccentric means whereby rotation of the first shaft turns the arm means which acts against said cylindrical inside surface wherein the eccentric means rotatably turns about the rotational axis of the input shaft, and moves the ring gear around the internal spur gear teeth on the housing, said arm means having a radial length greater than the off-set of the eccentric means from the axis of rotation of the first shaft, a circular flange secured to the second shaft, said ring gear having a wall having a plurality of openings, and means mounted on the flange extended into the openings whereby on movement of the ring gear around the internal spur gear teeth on the housing by rotation of the first shaft rotates the second shaft.