A ball screw mechanism

F - Mech Eng,Light,Heat,Weapons – 16 – H

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F16H 25/22 (2006.01)

Patent

CA 2232825

A screw shaft, a nut, and a conduit member are made of metal material, and a solid lubrication film is coated on inner walls of thread grooves thereof and a ball circulation path of the conduit member. Where d1 is the inner diameter of the ball circulation path of the conduit member, d2 is the groove diameter of the screw shaft, d3 is the diameter of each ball, and h1 is a clearance between the screw shaft and the end portion of the thread groove (as well as the end portion of the conduit member), respective members are arranged so as to satisfy relations of (¦d1-d2¦/d3) ~ 1/40 and h1/h3 ~ 1/40. As a result, it is possible to provide a ball screw mechanism in which film-transfer lubrication is achieved between the members and the durability and precision are improved.

L'invention porte sur un arbre à vis à billes, un écrou et un conduit, tous faits d'une matière métallique, sur une pellicule solide de lubrification recouvrant les parois internes des rainures du filetage du conduit et sur un conduit utilisé pour le passage des billes. Sur les dessins, d1 représente le diamètre interne du conduit pour le passage des billes; d2, le diamètre des rainures de l'arbre à vis à billes; d3, le diamètre des billes; et h1, le dégagement entre l'arbre à vis à billes et le sommet des rainures du filetage (ainsi que l'extrémité du conduit). Les éléments respectifs sont disposés de façon à satisfaire les rapports (]d1-d2]/d3)~1/40 et h1/h3~1/40. Résultat : il est possible d'obtenir un mécanisme à vis à billes dans lequel le transfert de la pellicule de lubrification entre les éléments est atteint et la durabilité et la précision sont améliorées.

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