Patent ID: 10520022

Abstract:
Provided is a linear motion device having higher rigidity, higher load resistance, and superior guiding precision. In this linear motion device, a linearly moving element 2 that moves linearly relative to a rail element 1 is provided, load paths 4 through which rolling elements 3 move are provided between the rail element 1 and the linearly moving element 2, and endless rolling element circulation paths are formed in which the load paths 4 are made to communicate via return paths 5 with no-load paths 6, wherein the rolling elements 3 are cylinders of which the length is at least three times the diameter, the rolling elements 3 are configured so as to circulate through the endless rolling element circulation paths while being rotatably held by rolling element holders 10 configured by spacers 8 provided between adjacent rolling elements 3 and belt-shaped linking elements 9 that link spacers 8 together at both ends, the no-load paths 6 are formed by placing no-load path-constituting members 12 in linear holes 11 formed in the linearly moving element 2, and the no-load path-constituting members 12 are configured such that the end surfaces of the rolling elements 3 are opened on the outward sides and the linking elements 9 of the rolling element holders 10 are exposed.