ROPS-Mounted Positioning Unit Layout to Protect Tractor Harness
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Solution Overview
Problem
The positioning unit's harness connection portion in tractors is at risk of being damaged when the work instrument connected to the tractor body is raised, as it may come into contact with the work instrument due to its location at the back portion of the ROPS frame.
Innovation Solution
A support unit is fixed to the upper portion of the ROPS frame, positioning the harness connection portion of the positioning unit behind the ROPS frame, thus preventing contact with the work instrument and maintaining the structural integrity of the ROPS frame by avoiding the need for holes that could weaken it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the positioning unit is fixed to the upper portion of the ROPS frame with the harness connection portion at the back, then the positioning function is achieved, but the harness connection portion may come into contact with the work instrument and be damaged when the work instrument is raised
Solution Approach 1:
The support unit extends the positioning unit forward in the longitudinal direction, moving the harness connection portion from a vulnerable rear position to a protected forward position. This dimensional relocation separates the harness connection portion from the work instrument's movement path, eliminating the contact risk while preserving positioning functionality.
Solution Approach 2:
The support unit acts as an intermediary structure that physically separates the positioning unit from the ROPS frame's upper portion. By positioning the harness connection portion on the support unit rather than directly on the ROPS frame, the design creates a spatial buffer that prevents work instruments from reaching the harness connection portion during raising operations.
2Ease of operation
If holes are made in the ROPS frame to pass the harness, then the harness can be connected, but the strength of the ROPS frame is reduced
Solution Approach 1:
The harness connection function is extracted from the ROPS frame structure and relocated to the support unit. The harness connection portion is positioned on the support unit, which is attached to the ROPS frame but does not require holes through the frame itself. This extraction preserves the ROPS frame's structural integrity while enabling harness connection functionality.
Solution Approach 2:
The mounting system is segmented into two independent parts: the ROPS frame structure and the support unit. The support unit serves as a separate mounting platform that can be attached to the ROPS frame without compromising the frame's strength. This segmentation allows the harness to be connected to the support unit rather than requiring holes in the ROPS frame.
Data Source
AI summary
A work vehicle includes a vehicle body to which work instrument is connected at a back, and a ROPS frame erected at a back portion of a driver seat area in the vehicle body. The work vehicle further includes a positioning unit configured to detect a position of the vehicle body based on a signal sent from a positioning satellite, and a support unit that is fixed to an upper portion of the ROPS frame and supports the positioning unit from below. The positioning unit has a harness connection portion that is connected to a harness for sending information to outside. The harness connection portion is located at a back portion of the positioning unit. The support unit is located protruding backwardly from the harness connection portion of the positioning unit.