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BALL SCREW DEVICE, POWER TRANSFER MECHANISM, ELECTRIC POWER STEERING APPARATUS, AND METHOD FOR MANUFACTURING BALL SCREW DEVICE

  • US 20150284020A1
  • Filed: 03/31/2015
  • Published: 10/08/2015
  • Est. Priority Date: 04/07/2014
  • Status: Active Grant
First Claim
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1. A ball screw device comprising:

  • a threaded shaft with a groove formed on an outer peripheral surface of the shaft; and

    a cylindrical nut whose screw-thread mates with the groove on the threaded shaft via a plurality of balls, whereinthe nut comprises a pair of mounting holes in each of which a deflector is installed, and a communication groove that allows the mounting holes to communicate with each other,an opening of the communication groove is formed on an outer peripheral surface of the nut, and the balls are able to roll through the communication groove, anda width of the opening of the communication groove is smaller than a diameter of the balls.

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