Patent ID: 8132479

Claim:
A screw device comprising: a screw shaft having an outer peripheral surface with a rolling-element rolling groove spirally formed thereon; a nut having an inner peripheral surface with a loaded rolling-element rolling groove spirally formed thereon facing the rolling-element rolling groove of the screw shaft; a circulation member having a rolling-element return path connecting one end of the loaded rolling-element rolling groove of the nut with an opposite end thereof; and a plurality of rolling elements arranged in the rolling-element return path of the circulation member and a loaded rolling-element rolling path between the rolling-element rolling groove of the screw shaft and the loaded rolling-element rolling groove of the nut, the rolling elements rolling in the loaded rolling-element rolling path, being scooped up at an end part of the circulation member and returned into the loaded rolling-element rolling path by an opposite end part of the circulation member, the end part of the circulation member having an periphery including a rolling groove connecting part which is positioned to a side of the loaded rolling-element rolling groove of the nut and connected to the loaded rolling-element rolling groove of the nut and a scooping part which is positioned to a side of the rolling-element rolling groove of the screw shaft and scoops up the rolling elements from the loaded rolling-element rolling path, the nut having a side surface having a through hole formed therein which reaches the loaded rolling-element rolling groove of the nut, the rolling groove connecting part of the end part of the circulation member being made of resin and mold-formed integral with an inner peripheral surface of the through hole in the nut with no space formed therebetween, the scooping part of the end part of the circulation member being made of resin and formed integral with the rolling groove connecting part, and a space being formed between the inner peripheral surface of the through hole and an outer peripheral surface of the scooping part of the end part by drawing a die out.