| 摘要 |
The invention relates to a mechanism with a screw (1) and a nut made of two sheet metal halves (4, 5) and having two complementary helical grooves (12, 13, 14, 15) which constitute raceways for a number of rolling bodies (16, 17) circulating in at least one closed loop around the screw. In order to provide a mechanism with small dimensions and good circulation conditions for the rolling bodies, the groove in a cylindrical portion of the nut surrounding the screw is provided with a recessed portion (18, 19) with a pitch that is different from the rest of the groove, said recessed portion constituting a return portion of the closed loop over a ridge (3) between two adjacent groove turns in the screw. |
