Integrated Coupler-Journal for Solar Tracker Grounding and Bearing
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Solution Overview
Problem
Conventional single axis trackers for solar panels require multiple parts for coupling, bearing, and grounding, leading to increased complexity, labor, and potential reliability issues due to the use of plastic bushings and separate grounding straps, which can be prone to failure and inconsistency.
Innovation Solution
A coupler-journal device that combines the functions of a mechanical coupler and a rotating journal, using metal-on-metal contact to minimize friction, wear, and provide a continuous electrical ground path, eliminating the need for plastic bushings and separate grounding straps by integrating a clamp-on coupler that performs as both a torque tube coupler and a bearing journal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate parts (coupler, bearing, grounding strap) are used in conventional single axis trackers, then the system can perform coupling, rotation, and grounding functions, but the device complexity increases and reliability decreases due to more components and potential failure points
Solution Approach 1:
The patent combines the coupler, bearing, and grounding functions into a single integrated journal component. This journal has a hollow interior that receives the torque tube (coupling function), an outer surface that contacts the bearing housing for rotation (bearing function), and metal construction that provides electrical grounding (grounding function). This eliminates the need for separate plastic bushings and grounding straps, reducing the number of parts and potential failure points.
Solution Approach 2:
The journal component performs multiple functions simultaneously: it acts as a mechanical coupler for the torque tube, a bearing surface for rotation, and an electrical ground path. This multi-functionality reduces device complexity while maintaining all necessary system functions, directly addressing the contradiction between reliability and complexity.
2Reliability
If plastic bushings are used in conventional designs, then grounding can be achieved with separate straps, but friction and wear increase and reliability decreases due to plastic material limitations
Solution Approach 1:
The patent uses metal (aluminum or galvanized steel) for the journal instead of plastic bushings. This metal construction provides both low-friction rotational contact with the bearing housing and continuous electrical conductivity for grounding. The metal material simultaneously eliminates the harmful effects of plastic wear while maintaining reliable grounding without separate straps.
Solution Approach 2:
The journal integrates the grounding function directly into the rotational bearing surface by using electrically conductive metal material. This eliminates the need for separate plastic bushings and grounding straps, reducing friction and wear while improving grounding reliability through the inherent electrical conductivity of the metal journal.
3Ease of operation
If separate grounding straps and plastic bushings are used, then coupling and rotation functions can be performed, but installation and maintenance labor increase due to additional components
Solution Approach 1:
The journal consolidates coupling, bearing, and grounding functions into a single component that installs in one operation. The hollow interior receives the torque tube, the outer surface provides bearing contact, and the metal construction provides grounding—all achieved simultaneously during installation, eliminating the need for separate installation steps for bushings and grounding straps.
Solution Approach 2:
The multi-functional journal performs coupling, rotation, and grounding in a single component, reducing installation and maintenance labor. This universal component eliminates the need to handle and install separate plastic bushings and grounding straps, directly reducing time loss while improving ease of operation.
4Ease of manufacture
If multiple components are used in conventional designs, then specific functions can be performed, but material and manufacturing costs increase due to more parts
Solution Approach 1:
The journal combines multiple functions into a single manufactured component, reducing the total quantity of materials needed. Instead of manufacturing separate plastic bushings, metal couplers, and grounding straps, the single metal journal consolidates all these functions, reducing material quantity and manufacturing complexity.
Solution Approach 2:
The universal journal performs coupling, bearing, and grounding functions in one component, reducing material quantity and manufacturing steps. This multi-functional design eliminates the need to manufacture and assemble multiple separate parts, directly improving ease of manufacture while reducing total material consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces material, installation, and maintenance costs by consolidating functions into fewer parts, enhances reliability with low friction and wear resistance, and simplifies assembly and adjustment by eliminating the need for additional hardware, while maintaining a continuous electrical ground path.
Implementation Method 1
using metal-on-metal contact to minimize friction, wear
Implementation Method 2
provide a continuous electrical ground path
Data Source
AI summary
A journal-coupler includes a first portion including a first pair of flanges and a first coupler portion and a second portion that is removably connected to the first portion. The second portion includes a second pair of flanges and a second coupler portion. The first coupler portion and the second coupler portion combine to form an enclosed torque tube portion.