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US 6,668,673 B2Granted
Ball screw with ball retainer cage
AssigneeHiwin Technologies Corp.
InventorSlady Hsu
Life of this patent
Estimating the term…
Abstract
A ball screw with ball retainer cage equipped between the screw bolt and the nut body is disclosed. The adjacent balls can move without squeezing each other and well protected in the retainer cage from dropping off therefrom when the retainer cage is disintegrated from the screw bolt and the nut body simultaneously. The total length of the ball screw assembly can be shortened to make the assembly compact in size. In addition, the specification of the product can be standardized to facilitate mass production with a reduced cost employing die casting process.
Claims6
A ball screw with ball screw retainer cage comprising:
- a screw bolt having a spiral groove formed along an outer surface thereof;
- a hollow nut body being sleeved over said screw bolt, having a spiral groove formed along an inner surface thereof, corresponding to the spiral groove of said screw bolt;
- a plurality of rolling balls interposed in said grooves of said screw bolt and said nut body;
- and,
- a plurality of rolling ball retainer cages disposed between said screw bolt and said nut body, each said retainer cage defining a plurality of retainer holes, each rolling ball occupying one said retainer hole so that adjacent ones of said rolling balls are kept isolated one from the other, an extended portion being formed at an outer side of said retainer cage along said spiral groove of said nut body, a protrusion being formed from both sides of said extended portion at each said retainer hole to prevent said rolling ball received therein from dropping off outwardly;
- each said retainer cage having a joint hole provided at an end portion thereof, adjacent ones of said retainer cages being linked together by a connecting belt engaging said joint holes thereof.
3 more elements
Dependencies are inferred from the claim text.