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Ball screw

  • US 7,536,928 B2
  • Filed: 06/16/2006
  • Issued: 05/26/2009
  • Est. Priority Date: 06/16/2005
  • Status: Active Grant
First Claim
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1. A ball screw comprising:

  • a screw shaft formed with a helical screw groove on its outer circumferential surface;

    a nut adapted to mate with the screw shaft, said nut formed with a helical screw groove on its inner circumferential surface, said nut helical screw groove corresponding to the screw shaft screw groove;

    a number of balls rollably contained within a ball rolling passage formed by oppositely arranged screw grooves; and

    bridge members, each formed with a connecting groove on its inner circumferential surface, for connecting the nut screw grooves; and

    a contact angle between the ball and the screw groove is set within a range of about 20˜

    40°

    .

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