Off-set swivel drive assembly for solar tracker
In an example, the present invention provides a solar tracker apparatus configured with an off-set drive assembly. In an example, the apparatus has an inner race structure, which has a cylindrical region coupled to a main body region, the main body comprising an off-set open region. The cylindrical region is an annular sleeve structure coupled to the main body region, which occupies the spatial region within the cylindrical region. In an example, the apparatus has an outer race structure coupled to enclose the inner race structure, configured to couple the inner race structure to allow the inner race structure to move in a rotational manner about a spatial arc region; and configured to allow the inner race structure to pivot about a region normal to a direction of the spatial arc region. In an example, the solar tracker has a clamp assembly that is configured to pivot a torque tube.
1. A solar tracker apparatus, the apparatus comprising:
a inner race structure, the inner race structure comprising a cylindrical region coupled to a main body, the main body comprising an open region;
an outer race structure coupled to enclose the inner race structure, and configured to couple the inner race structure to allow the inner race structure to move in a rotational manner about a spatial arc region;
a torque tube sleeve configured on a region between a center region and an outer region of the inter race structure, and configured to be inserted within the open region, the torque tube sleeve having a portion male portion configured with a multi-sided structure;
a multi-sided female open region configured in the open region, and intimately coupling a multi-sided structure of the torque tube sleeve to firmly engage the torque tube sleeve into the inner race structure such that the torque tube sleeve is locked within the multi-sided female open region such that the torque tube sleeve and the multi-sided female opening region move in concert with each other, and cannot move relative to each other; and
a drive coupled to the inner race structure to cause the torque tube sleeve to move about an arc region;
wherein the torque tube sleeve is configured to rotate about a first axis, while the inner race structure rotates about a second axis, and the inner race structure being engaged with the torque tube sleeve via the coupling between the multi-sided female open region and the multi-sided structure of the torque tube such that torsional force of the torque tube sleeve is transferred to the inner race structure during the rotation of the torque tube sleeve about the first axis.
2. The apparatus of claim 1 wherein drive comprises a slew gear device, the slew gear device comprising a worm gear operably coupled to a portion of the inner race structure comprising a plurality of gears, while other portions of the inner race structure are smooth; and the multi-sided structure of the torque tube sleeve comprises a first ball end structure and a second ball end structure.
3. The apparatus of claim 1 wherein the outer race structure is configured from a rigid steel structure and shaped as an annular sleeve having a main hub region for a slew gear device and a support structure comprising a flat region for a pier structure.
4. The apparatus of claim 1 wherein the drive comprises a slew gear device that transfers torque for rotating the inter race structure from a first spatial region to a second spatial region and then from the first spatial region to the second spatial region in a rocking motion to track movement of a solar source.
5. The apparatus of claim 1 wherein the inner race structure is coupled to the outer race structure using a bearing or a bushing device to couple the inner race structure to the outer race structure for the radial movement.
6. The apparatus of claim 1 wherein the inner race comprises a plurality of gear structures; and further comprises a bearing assembly or a bushing assembly.
7. The apparatus of claim 1 wherein the torque tube sleeve is configured on the region between a center region and an outer region using a cylindrical bearing assembly to facilitate movement about the spatial arc region and facilitate movement normal to the spatial arc region to pivot the inner race structure.
8. The apparatus of claim 1 wherein the outer race structure comprises a main hub region configured in a perpendicular direction to a worm gear assembly; and further comprising a clamp member to sandwich the inner race structure between the clamp member and the outer race structure.
9. The apparatus of claim 1 wherein the outer race structure comprises a main hub region configured in a perpendicular direction to a worm gear assembly, the worm gear assembly being coupled to an electric motor drive.
10. The apparatus of claim 1 further comprising a torque tube coupled to the torque tube sleeve; and further comprising a plurality of solar panels configured on the torque tube.
11. The apparatus of claim 1 , wherein the torque tube sleeve is off-set with respect to the center region of the inner race structure.