Screw device manufacturing method and screw device
AssigneeThk Co., Ltd.
InventorsAkihiro Teramachi, Takeki Shirai, Yuji Tachikake
Life of this patent
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Abstract
A method of producing a screw device, having high productivity and capable of achieving sufficient strength of a nut. The method of producing a screw device has a groove forming step for previously forming a load ball rolling groove in a flat plate, which step is followed by a nut forming step for forming a nut by bending the flat plate into a ring. Since the method has, after the groove forming step in which the load rolling groove is formed in the flat plate, the nut forming step in which the flat plate is bent into a ring, sufficient strength of the nut can be easily achieved, and in addition, high compression stress is left in the load ball rolling groove in the inner diameter surface of the nut.
Claims9
A screw device manufacturing method of a screw device having a plurality of rolling elements disposed between a spiral rolling-element rolling groove of a screw shaft and at least one one-turn groove of a nut including a spiral loaded rolling-element rolling groove of less than one turn facing the rolling-element rolling groove of the screw shaft and a return groove connecting both ends of the loaded rolling-element rolling groove, comprising:
- a groove forming step of forming the loaded rolling-element rolling groove and the return groove in a flat plate;
- and
- a nut forming step of forming the nut by bending the flat plate into a ring.
(canceled)
A screw device comprising:
- a screw shaft having an outer surface with a rolling-element rolling groove spirally formed thereon;
- a nut having an inner surface with at least one one-turn groove formed thereon including a loaded rolling-element rolling groove of less than one turn facing the rolling-element rolling groove of the screw shaft and a return groove connecting both ends of the loaded rolling-element rolling groove;
- and
- a plurality of rolling elements disposed between the rolling-element rolling groove of the screw shaft and the one-turn groove of the nut,
- wherein the loaded rolling-element rolling groove and the return groove are first formed in a flat plate and the nut is formed by bending the flat plate into a ring.
(canceled)
Dependencies are inferred from the claim text.