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    Screw device
    31.
    发明专利
    Screw device 有权

    公开(公告)号：JP5341893B2

    公开(公告)日：2013-11-13

    申请号：JP2010522724

    申请日：2009-07-28

    Applicant: Thk株式会社

    Inventor： 武樹 白井 ,  勝也 飯田 ,  荘志 宮原 ,  勉 富樫

    IPC: F16H25/22

    CPC classification number: F16H25/2214 ,  F16H2025/2242

    Abstract: A screw device enabling integer winding and also enabling rolling elements to circulate smoothly. The screw device comprises a screw shaft (1) having a spiral rolling element rolling groove (1a) in the outer peripheral surface, a nut (2) having a spiral load rolling element rolling groove (2a) facing the rolling element rolling groove (1a) of the screw shaft (1) in the inner peripheral surface and also having a no-load return passage (10) connected to one and the other ends of the load rolling element rolling groove (2a), and a plurality of rolling elements (3) so arranged as to be circulated through a circulation path comprising a load rolling element rolling passage between the rolling element rolling groove (1a) of the screw shaft (1) and the load rolling element rolling groove (2a) of the nut (2) and the no-load return passage (10).  The no-load return passage (10) comprises a pick-up passage (22) the center line of which is arcuate when viewed from the axial direction of the nut (2) and which picks up the rolling elements (3) moving in the load rolling element rolling passage along the arcuate path and an axial passage (24) the center line of which is parallel to the axis of the nut (2) and which allows the rolling elements (3) to move parallel to the axis of the nut (2).

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