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US 2006/0230849 A1Published application
Ball screw device
AssigneeNsk Ltd.
InventorTakayuki Yabe
Life of this patent
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AssigneeNsk Ltd.
InventorTakayuki Yabe
Estimating the term…
A ball screw device 1 has a screw shaft assembly 15, a nut 7 having an inner diameter smaller than the outer diameter of the screw shaft assembly 15 and formed in a tubular shape, and balls 9 rolling on helical raceway grooves 3, 8 formed in the outer peripheral surface of the screw shaft assembly 15 and the inner peripheral surface of the nut 7. The screw shaft assembly 15 has a first screw shaft 16, a second screw shaft 17 having a shaft raceway groove 3 with the lead same as the lead of a shaft raceway groove 3 formed in the first screw shaft 16, and a screw-in spacer 11 having the inner peripheral surface fitted on shaft sections 18, 19 each formed on one end of each of the first and the second screw shafts 16, 17.
A ball screw device comprising a plurality of screw shafts each having an outer circumferential surface and a spiral shaft raceway groove formed on the outer circumferential surface, a joining member for joining the screw shafts, a nut having an inner circumferential surface with a nut raceway groove opposed to the shaft raceway groove, and a plurality of balls loaded between the shaft raceway groove and the nut raceway groove, in which
Dependencies are inferred from the claim text.