Linear bearing assembly with spherical rollers
View Patent ↗A linear bearing employs spherical roller bodies which are contained in a roller nut body with two drive helixes and two return helixes which form a continuous loop in the nut body. The return helixes are offset from the drive helixes and have a pressure relief cutout to allow for movement of the spherical roller bodies through the return helix region.
1. A roller nut assembly for a linear bearing of a ground shaft, comprising:
a cylindrical ring having two drive helix regions and two return helix regions; the two return helix regions positioned opposite one another on the ring; an inwardly facing flange on each axial edge of the ring, an inner surface of the ring defining an outer race; and
a plurality of spherical roller cage assemblies positioned between each flange and abutting the inner surface of the ring, each roller cage assembly housing a spherical roller body in a cage.
2. The nut of claim 1 , wherein
the return helix regions are offset from the drive helix regions.
3. The nut of claim 2 , wherein
the return helix region has a pressure release cutout in the ring.
4. The nut of claim 2 , wherein
the offset is defined by an angle of about 3°.
5. The nut of claim 1 , wherein
the cage has two linear side walls, a linear top wall and a linear bottom wall, and four arched corners connecting the side walls to the top and bottom wall.
6. The nut of claim 1 , wherein
an inner surface of the ring being concave.
7. The nut of claim 1 , further comprising
a pressure ring mounted on outside of the ring.
8. A linear bearing assembly comprising:
a ground shaft and a roller nut mounted on the ground shaft, wherein the roller nut has a cylindrical ring having two drive helix regions and two return helix regions; the two return helix regions positioned opposite one another on the ring; an inwardly facing flange on each axial edge of the ring, an inner surface of the ring defining an outer race; and
a plurality of spherical roller cage assemblies positioned between each flange and abutting the inner surface of the ring, each roller cage assembly housing a spherical roller body in a cage.
9. The assembly of claim 8 , wherein
the return helix regions are offset from the drive helix regions.
10. The assembly of claim 9 , wherein
the return helix region has a pressure release cutout in the ring.
11. The assembly of claim 9 , wherein
the offset is defined by an angle of about 3°.
12. The assembly of claim 8 , wherein
the cage has two linear side walls, a linear top wall and a linear bottom wall, and four arched corners connecting the side walls to the top and bottom walls.
13. The assembly of claim 8 , wherein
an inner surface of the ring being concave.
14. The assembly of claim 8 , further comprising:
a pressure ring mounted on outside of the ring.