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Ball nut with tangential no load-guided return path

  • US 5,142,929 A
  • Filed: 03/29/1991
  • Issued: 09/01/1992
  • Est. Priority Date: 03/29/1991
  • Status: Expired due to Fees
First Claim
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1. A ball nut, which comprises a body having an axial bore extending through said body, at least one substantially helical path track on said axial bore for receiving a plurality of ball bearings for engaging threads of a lead screw, at least one return path for said plurality of ball bearings connecting ends of said at least one substantially helical path track and at least one pick-off for said plurality of ball bearings connecting said at least one substantially helical path track and said at least one return path to deflect said plurality of ball bearings from said at least one substantially helical path track while said plurality of ball bearings are under no load, said at least one pick-off engaging said at least one substantially helical path track tangent to said at least one substantially helical path track, said at least one pick-off comprising a return guide insert engaging said at least one substantially helical path track and said at least one return path including a return guide cover engaging said return guide insert, said return guide insert and said return path cover each having mating curved passages to define a smooth curve path from said at least one substantially helical path track to said at least one return path, said at least one substantially helical path track being configured adjacent to said at least one pick-off so that one of said plurality of ball bearings is free of load when adjacent to said at least one pick-off.

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