UNIVERSAL JOINT AND PARALLEL MECHANISM MACHINE HAVING THIS UNIVERSAL JOINT

摘要

PROBLEM TO BE SOLVED: To provide a highly rigid/highly accurate small universal joint having two degrees of freedom of rotation or three degrees of freedom of rotation. ;SOLUTION: One end of a first node 10 is connected to a base 15 via a rolling bearing 17, circular arc-shaped guide bearings 16 are arranged in a plurality in a symmetrical position to the center line of the first node 10 on the opposite side of the base 15, and a circular arc-shaped rail 25a formed around a cylindrical base 17 is engaged with the circular arc-shaped guide bearings, 16. A shaft 20 is arranged in the diametrical direction passing through the circular arc center of the circular arc-shaped rail 25a of the cylindrical base 17, and a second node 22 is connected to the shaft 20 via a rolling bearing 18 so that the rotational center is positioned on the rotary axis of the base 15.;COPYRIGHT: (C)2000,JPO