摘要 |
There is provided a roller screw comprising a screw shaft 1 having an outer peripheral surface in which a spiral roller rolling groove 1 a is formed, a nut member 2 having an inner peripheral surface in which a spiral loaded roller rolling groove 2 a is formed so as to oppose to the roller rolling groove of the screw shaft, a return pipe 4 in which a roller return passage 5 is formed so as to connect one and another ends of a loaded roller rolling passage 3 between the roller rolling groove 1 a of the screw shaft 1 and the loaded roller rolling groove 2 a of the nut member 2 , a number of rollers 6 disposed in the loaded roller rolling passage 3 and the roller return passage 5 , wherein the roller return passage 5 is twisted so that an attitude of the roller 6 changes as the roller moves in an axial direction of the return pipe 4 . Such roller screw enables to provide an easy assembling and compact structure and to realize smooth circulation of the roller.
|