Flexure bearing assembly
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 flexure assembly comprising:
a first mating plate and a second mating plate, the first mating plate defining a first axis and the second mating plate defining a second axis different from the first axis;
a flex plate coupled to and disposed between the first mating plate and the second mating plate, the flex plate configured to flex around the first axis defined by the first mating plate and flex around the second axis defined by the second mating plate, each of the first mating plate and the second mating plate having a length that is a respectively longest side such that the length of the first mating plate and second mating plate are non-parallel with each other; and
a first bearing coupled to the first mating plate and a second bearing coupled to the second mating plate.
2. The flexure assembly of claim 1 , wherein the length of the first mating plate and the second mating plate are perpendicular to each other.
3. The flexure assembly of claim 1 , wherein the first mating plate and the second mating plate have a rectangular shape.
4. The flexure assembly of claim 1 , wherein the flex plate is a different shape than the first mating plate and the second mating plate.
5. A flexure assembly comprising:
a first mating plate and a second mating plate, the first mating plate defining a first axis and the second mating plate defining a second axis different from the first axis;
a flex plate coupled to and disposed between the first mating plate and the second mating plate, the flex plate having an octagon shape and being configured to flex around the first axis defined by the first mating plate and flex around the second axis defined by the second mating plate.
6. The flexure assembly of claim 1 , wherein the first mating plate is attached to a first stub shaft and the second mating plate is attached to a second stub shaft.
7. The flexure assembly of claim 6 , wherein the first stub shaft is perpendicular to a plane of the first mating plate and the second stub shaft is perpendicular to a plane of the second mating plate.
8. The flexure assembly of claim 6 , wherein the first bearing is attached to the first stub shaft and the second bearing is attached to the second stub shaft.
9. The flexure assembly of claim 8 , wherein the first bearing and the second bearing are plastic.
10. The flexure assembly of claim 6 , wherein a first solar module mounting structure coupler is attached to the first stub shaft and configured to support an end of a first solar module mounting structure,
and a second solar module mounting structure coupler is attached to the second stub shaft and configured to support an end of a second solar module mounting structure.
11. The flexure assembly of claim 10 , wherein the first solar module mounting structure coupler is a cradle and has a sight hole configured to allow sight of an end of the first solar module mounting structure supported in the cradle.
12. The flexure assembly of claim 1 , further comprising a first overload spring between the first mating plate and the flex plate and a second overload spring between the second mating plate and the flex plate.
13. The flexure assembly of claim 1 , further comprising a third overload spring between the first mating plate and the flex plate and a fourth overload spring between the second mating plate and the flex plate.
14. The flexure assembly of claim 1 , further comprising fasteners attaching the first and second mating plate to the flex plate, each of the fasteners attached to force distributing washers.
15. The flexure assembly of claim 1 , wherein the flex plate and the first and second mating plate are disposed on a bearing support comprising:
two bearing support panels; and
two side panels.
16. The flexure assembly of claim 15 , wherein the first mating plate is attached to a first stub shaft and the second mating plate is attached to a second stub shaft, the first stub shaft and the second stub shaft each extend along a third axis, and the two bearing support panels comprise bearing support slots arranged to allow the first bearing and the second bearing to move such that the first stub shaft and the second stub shaft are rotated around a fourth axis perpendicular with the second axis.
17. The flexure assembly of claim 15 , wherein the two side panels of the integrated bearing support comprise adjustment slots arranged to allow tilting the flexure bearing assembly on a foundation supporting the bearing support.
18. The flexure assembly of claim 1 , further comprising a spacer between the first mating plate and the flex plate.
19. A tracker comprising:
a foundation;
a flexure assembly mounted on the foundation and comprising:
a first solar module mounting structure coupler;
a first mating plate coupled to the first solar module mounting structure coupler,
a second mating plate, each of the first mating plate and the second mating plate having a length that is a respectively longest side such that the length of the first mating plate and second mating plate are non-parallel with each other;
a flex plate disposed between and coupled to the first mating plate and the second mating plate, the flex plate configured to flex around the first axis defined by the first mating plate and flex around the second axis defined by the second mating plate; and
a first bearing coupled to the first mating plate and a second bearing coupled to the second mating plate,
a first solar module mounting structure supported by the first solar module mounting structure coupler.
20. The tracker of claim 19 , further comprising a second cradle coupled to the second mating plate and a second torque tube supported by the second cradle, wherein the first solar module mounting structure coupler is a first cradle and the first solar module mounting structure is a first torque tube.