Thrust surface bearing
Solar trackers that may be advantageously employed on sloped and/or variable terrain to rotate solar panels to track motion of the sun across the sky include bearing assemblies and other mechanical features configured to address mechanical challenges posed by the sloped and/or variable terrain that might otherwise prevent or complicate use of solar trackers on such terrain.
1. A bearing assembly comprising:
a shaft;
one or more bearings in direct contact with the shaft and comprising a first bearing thrust surface;
one or more bearing straps securing the one or more bearings to the shaft;
a first thrust surface in direct contact with the first bearing thrust surface of the one or more bearings;
wherein the one or more bearings and the one or more bearing straps are configured to provide frictional load on the shaft to dampen natural harmonics transmitted through the shaft.
2. The bearing assembly of claim 1 , further comprising a first solar module mounting structure coupler comprising the first thrust surface and configured to support a first solar module mounting structure coupler.
3. The bearing assembly of claim 2 , further comprising a second solar module mounting structure coupler comprising a second thrust surface and configured to support a second solar module mounting structure,
wherein the one or more bearings comprises a second bearing thrust surface in direct contact with the second thrust surface.
4. The bearing assembly of claim 3 , wherein the one or more bearings consists of one bearing comprising one end comprising the first bearing thrust surface and an opposite end comprising the second bearing thrust surface,
the one or more bearing straps consists of one bearing strap.
5. The bearing assembly of claim 4 , wherein the one bearing is substantially a same length as the shaft.
6. The bearing assembly of claim 5 , wherein one end of the shaft is attached to the first solar module mounting structure coupler and an opposite end of the shaft is attached to the second solar module mounting structure coupler.
7. The bearing assembly of claim 4 , further comprising a bearing support with a bearing support panel and side panels extending away from the bearing support panel, the bearing support panel supporting the one bearing.
8. The bearing assembly of claim 7 , wherein the shaft extends along a first axis, and the bearing support panel comprises pivot slots arranged to allow the one bearing to move such that the shaft is rotated around a second axis perpendicular to the first axis.
9. The bearing assembly of claim 4 , wherein the shaft has equal diameter throughout a length of the shaft.
10. The bearing assembly of claim 7 , wherein the side panels of the bearing support comprise adjustment slots arranged to allow tilting the bearing assembly on a foundation supporting the bearing support.
11. The bearing assembly of claim 1 , wherein the one or more bearing consists of a first bearing and a second bearing, and the one or more bearing straps consists of a first bearing strap securing the first bearing to the shaft and a second bearing strap securing the second bearing to the shaft.
12. The bearing assembly of claim 11 , wherein:
the first bearing comprises the first bearing thrust surface and a second bearing thrust surface,
the second bearing comprises a third bearing thrust surface and a fourth bearing thrust surface,
and the shaft comprises the first thrust surface, a second thrust surface in direct contact with the second bearing thrust surface of the first bearing, a third thrust surface in direct contact with the third bearing thrust surface of the second bearing, and a fourth thrust surface in direct contact with the fourth bearing thrust surface of the second bearing.
13. The bearing assembly of claim 12 , wherein a middle portion of the shaft has a larger diameter than portions of the shaft in direct contact with the first bearing or the second bearing.
14. The bearing assembly of claim 11 , further comprising bearing support with two bearing support panels and side panels extending away from the two bearing support panels, the two bearing support panels supporting the first bearing and the second bearing.
15. The bearing assembly of claim 14 , wherein the shaft extends along a first axis, and the two bearing support panels comprise pivot slots arranged to allow the first bearing and the second bearing to move such that the shaft is rotated around a second axis perpendicular to the first axis.
16. The bearing assembly of claim 11 , further comprising an articulating joint disposed between the first bearing and the second bearing, and
a second shaft extending away from the articulating joint and through the second bearing,
wherein the shaft extends away from the articulating joint and through the first bearing.
17. The bearing assembly of claim 11 , further comprising:
a flexure device comprising:
a flex plate, and
two mating plates disposed with the flex plate between them,
a second shaft extending away from the articulating joint and through the second bearing,
wherein the shaft extends away from the articulating joint and through the first bearing, and
wherein the flexure device is disposed between the first bearing and the second bearing.
18. The bearing assembly of claim 1 , wherein the one or more bearings is plastic.
19. A tracker comprising:
a foundation;
a bearing assembly mounted on the foundation and comprising:
a shaft;
one or more bearings coupled with the shaft and comprising a first bearing thrust surface;
one or more bearing straps securing the one or more bearings to the shaft;
a first thrust surface in direct contact with the first bearing thrust surface of the one or more bearings; and
a first solar module mounting structure coupler coupled to the shaft, and
a first solar module mounting structure supported by the first solar module mounting structure coupler.
20. The tracker of claim 19 , wherein the one or more bearings and the one or more bearing straps are configured to provide frictional load on the shaft to dampen natural harmonics transmitted through into the shaft via the first solar module mounting structure.