Multilobed driveline

A solar tracker system, the solar tracker system comprising:

• a first solar tracker row, the first solar tracker row including:
• a first photovoltaic (PV) module;
• a first torque tube coupled to the first PV module such that rotation of the first torque tube rotates the first PV module;
• and
• a motor configured to exert a rotational force that rotates the first torque tube;
• a second solar tracker row, the second solar tracker row including:
• a second PV module;
• and
• a second torque tube coupled to the second PV module such that rotation of the second torque tube rotates the second PV module;
• and
• a first driveline assembly coupling the first solar tracker row to the second solar tracker row, the first driveline assembly including:
• a first driveline configured to transmit the rotational force from the motor at the first solar tracker row to the second torque tube, the first driveline including:
• an inner surface and an outer surface, the inner surface and outer surface defining a thickness of the first driveline;
• four lobes defined by portions of the inner and outer surfaces, the four lobes arranged symmetrically about a central axis centered in and extending through the first driveline;
• and
• four recesses defined by portions of the inner and outer surfaces, the four recesses arranged symmetrically about the central axis, each recess separating a lobe of the four lobes from another lobe of the four lobes;
• a first universal joint (U-joint) coupling the first driveline to the motor, the first U- joint configured to transmit the rotational force from the motor to the first driveline;
• and
• a second U-joint coupling the first driveline to the second solar tracker row, the second U-joint configured to transmit the rotational force from the first driveline to the second torque tube.