Patent ID: 8567279
Filing Date: 2013-10-29
Classification: F16H,Y10T

Abstract:
1. A mechanism for converting rotary motion into linear motion, comprising: a rod having a thread at an outer peripheral surface thereof; a holder member provided on the outer peripheral surface of the rod, and provided so as to be rotatable relative to the rod and axially movable relative thereto; and rollers supported rotatably by the holder member and having annular grooves brought into meshing engagement with the thread at outer peripheral surfaces thereof, each of said rollers torsionally disposed at an axial angle that is the same as a lead angle of the thread with respect to a central axis of the rod, wherein each of the rollers comprises a roller annular section, having a through hole at its central axis portion and the annular grooves at its outer peripheral surface, and a roller shaft, wherein the roller shaft is disposed in the through hole of the roller annular section so as to be rotatable relative to the roller annular section, wherein the roller shaft has a structure in which both ends thereof are secured to the holder member, wherein a holder insertion hole having a diameter greater than that of the roller shaft is provided at one end of the holder member, wherein one end of the roller shaft is secured to the one end of the holder member by a roller mounting member which fills a gap between an inner peripheral surface of the holder insertion hole and an outer peripheral surface of the one end of the roller shaft, wherein the holder insertion hole is formed as a hole extending through one end of the holder member, and wherein the roller mounting member is formed as a structure capable of being inserted from the non-roller annular section side of the through hole.