Screw-nut screw transmission coupling
AssigneeRoltra S.p.A.
InventorEnzo Brusasco
Life of this patent
Estimating the term…
Abstract
A screw-nut screw transmission coupling in which a tubular outer innerly-grooved sleeve and an inner outerly-grooved elongate member are coupled to define a plurality of endless ducts for circulation of a plurality of ball bearings; each said endless duct being formed by two adjacent turns of a helical duct defined by said outer sleeve and said inner elongate member, and a return duct extending through a respective through bore provided through said sleeve and straddling said two adjacent turns, said return duct being defined by a cavity provided in a plate fixed to the outer surface of said sleeve and closing said through bore.
Claims5
A screw-nut screw transmission coupling comprising a tubular outer member and an elongate inner member having complementary helical grooves cooperating to define a helical ball bearing duct;
- a plurality of return ducts extending between corresponding points of respective pairs of adjacent turns of said helical ball bearing duct to define therewith a pluratity of endless ball bearing ducts;
- and a plurality of ball bearings arranged in mutual engagement within each said endless duct;
- said tubular outer member comprising a tubular sleeve provided internally with one of said helical grooves and with a plurality of radial through bores, each said bore straddling a respective pair of adjacent turns of said internal helical groove and having a diameter substantially equal to the width of said pair of turns, and a plurality of plates coupled to the outer surface of said sleeve and each arranged to close a respective one of said through bores;
- each said return duct being in the form of a cavity provided in each said plate.
Dependencies are inferred from the claim text.