Spherical plain bearing for dampers
A spherical bearing for a damper system includes a first segment and a second segment with a ball therebetween. The ball includes a shaft extending therefrom. The shaft extends out of the first segment. A lubricious liner is disposed between the first segment and the second segment.
1. A spherical bearing assembly for a damper assembly, the spherical bearing assembly comprising:
a ball having a spherical exterior surface and a shaft extending therefrom;
an enclosure comprising:
(a) a first segment having a first spherical interior surface, a first axial abutment surface and an axial facing opening, the first spherical interior surface defining a first interior area, the axial facing opening extending into the first interior area;
(b) a second segment having a second spherical interior surface and a second axial abutment surface, the second spherical interior surface defining a second interior area;
a spacer disposed between the first axial abutment surface and the second axial abutment surface, the spacer abuts the first axial abutment surface and the second axial abutment surface;
a clearance adjustment assembly cooperating with the first segment and the second segment, the clearance adjustment assembly being configured to selectively adjust forces applied to the spacer by the first segment and the second segment to adjust clearance between the ball and the enclosure;
a lubricious liner disposed between the enclosure and the ball; and
the ball being disposed in the first interior area and the second interior area with the shaft extending out of the opening.
2. The spherical bearing assembly of claim 1 , wherein the second segment is removably secured to the first segment with the first axial facing surface abutting the second axial facing surface, such that the first spherical interior surface of the first segment axially restrains the ball from being pulled out through the opening.
3. The spherical bearing assembly of claim 1 , wherein the lubricious liner comprises woven fibers with PTFE in the form of at least one of powder, floc and fibers.
4. The spherical bearing assembly of claim 1 , wherein the lubricious liner is bonded to at least one of a portion of the first spherical interior surface and a portion of the second spherical surface.
5. The spherical bearing assembly of claim 1 , further comprising at least one alignment feature configured to align the first segment with the second segment.
6. The spherical bearing assembly of claim 5 , wherein the at least one alignment feature comprises a plurality of first holes extending axially inward from the first axial abutment surface, a plurality of second holes extending axially inward from the second axial abutment surface and a plurality of alignment pins, wherein the first holes and the second holes are axially aligned with each other and one of the pins extends into one of the first holes and aligned one of the second holes.
7. The spherical bearing assembly of claim 1 , further comprising a base secured to the second segment.
8. The spherical bearing assembly of claim 1 , wherein the clearance adjustment assembly comprises a threaded engagement between the first segment and the second segment.
9. The spherical bearing assembly of claim 1 , wherein the first segment and the second segment are axially retained between a housing and a locking flange.
10. The spherical bearing assembly of claim 1 , wherein the spacer is compressed between the first axial abutment surface and the second axial abutment surface by threadably torqueing a housing to a locking flange.
11. The spherical bearing assembly of claim 1 , further comprising an anti-rotation device configured to engage a locking flange and a housing to prevent relative rotation therebetween.
12. A tuned mass damper system comprising:
a viscous damping device having a first connector and a second connector;
a first spherical bearing assembly connected to the first connector;
a second spherical bearing assembly connected to the second connector;
the first spherical bearing assembly and the second spherical bearing assembly each comprising:
a ball having a spherical exterior surface and a shaft extending therefrom;
an enclosure comprising:
(a) a first segment having a first spherical interior surface, a first axial abutment surface and an axial facing opening, the first spherical interior surface defining a first interior area, the axial facing opening extending into the first interior area;
(b) a second segment having a second spherical interior surface and a second axial abutment surface, the second spherical interior surface defining a second interior area;
a lubricious liner disposed between the enclosure and the ball; and
the ball being disposed in the first interior area and the second interior area with the shaft extending out of the opening;
wherein the shaft of the first spherical bearing assembly is connected to the first connector and the shaft of the second spherical bearing assembly is connected to the second connector.
13. The tuned mass damper system of claim 12 , further comprising a wedge assembly in fixed relation to the second segment.
14. The tuned mass damper system of claim 12 , wherein the second segment of the first spherical bearing assembly is secured to a dampening mass and the second segment of the second spherical bearing assembly is secured to a building structure.
15. The tuned mass damper system of claim 12 , wherein the second segment is removably secured to the first segment with the first axial facing surface abutting the second axial facing surface, such that the first spherical interior surface of the first segment axially restrains the ball from being pulled out through the opening.
16. The tuned mass damper system of claim 12 , wherein the lubricious liner comprises woven fibers with PTFE in the form of at least one of powder, floc and fibers.
17. The tuned mass damper system of claim 12 , wherein the lubricious liner is bonded to at least one of a portion of the first spherical interior surface and a portion of the second spherical surface.
18. The tuned mass damper system of claim 12 , further comprising at least one alignment feature configured to align the first segment with the second segment.
19. The tuned mass damper system of claim 18 , wherein the at least one alignment feature comprises a plurality of first holes extending axially inward from the first axial abutment surface, a plurality of second holes extending axially inward from the second axial abutment surface and a plurality of alignment pins, wherein the first holes and the second holes are axially aligned with each other and one of the pins extends into one of the first holes and aligned one of the second holes.
20. The tuned mass damper system of claim 12 , further comprising:
a spacer disposed between the first axial abutment surface and the second axial abutment surface, the spacer abuts the first axial abutment surface and the second axial abutment surface; and
a clearance adjustment assembly cooperating with the first segment and the second segment, the clearance adjustment assembly being configured to selectively adjust forces applied to the spacer by the first segment and the second segment to adjust clearance between the ball and the enclosure.
21. The tuned mass damper system of claim 20 , wherein the clearance adjustment assembly comprises a threaded engagement between the first segment and the second segment.
22. The tuned mass damper system of claim 20 , wherein the first segment and the second segment are axially retained between a housing and a locking flange.
23. The tuned mass damper system of claim 20 , wherein the spacer is compressed between the first axial abutment surface and the second axial abutment surface by threadably torqueing a housing to a locking flange.
24. The tuned mass damper system of claim 20 , further comprising an anti-rotation device configured to engage a locking flange and a housing to prevent relative rotation therebetween.