Patent ID: 8336417

Claim:
A chain for a motion transmission apparatus being mounted on the motion transmission apparatus which consists of an elongated shaft, a movable member, at least one circulating member, a plurality of rolling elements; the chain comprising a plurality of spacers and two links, each of the spacers including a longitudinal direction and a transverse direction, one side of each of the spacers in the longitudinal direction being convex, and another side of each of the spacers in the longitudinal direction being concave, and the both sides of each of the spacers in the longitudinal direction being V or U-shaped, the two links being located at both ends of the respective spacers in the transverse direction to hold the spacers together in such a manner that the spacers are in parallel to and equidistantly spaced from one another by a receiving space which is provided for holding the rolling elements, and the convex side of each of the spacers is located toward the concave side of a corresponding neighboring spacer; wherein the convex side of each of the spacers is formed with a first retaining surface, and the concave side of each of the spacers is formed with more than one second retaining surface, the first and second retaining surfaces are all flat and simultaneously held in point-to-point contact with the rolling elements, all positions where the first and second retaining surfaces are in contact with the rolling elements are in the same plane; more than one oil-storage space appears in each of the receiving spaces for storage of lubricant oil, after the rolling elements are received in the receiving spaces, and a height of each of the spacers is 0.35-0.45 of a diameter of the rolling elements.