Folding ROPS Vibration Isolation via Rubber Wedge
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Solution Overview
Problem
Folding rollover protection systems (ROPS) for off-road vehicles face issues with retention pins that either become stuck or loose over time, leading to rattling during use, and require tools for adjustment and locking, compromising safety and usability.
Innovation Solution
A folding ROPS design featuring an upper section pivotably mounted to a lower section with a rubber isolation member and a tensioning screw mechanism that allows for tool-free folding and locking, preventing rattling and pin loosening by urging the isolation member tightly between the upper and lower sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retention pins are used to lock the ROPS in position, then the ROPS can be locked in upright or folded positions, but the pins become stuck or loose over time due to wear and vibration
Solution Approach 1:
A rubber isolation member is introduced as an intermediary between the upper and lower ROPS sections. This rubber member serves multiple functions: it provides vibration isolation to prevent pin loosening, acts as a cushioning element, and maintains consistent contact pressure without requiring tool adjustment. The rubber material's elastic properties allow it to accommodate wear while maintaining reliable pin retention.
Solution Approach 2:
The design changes the physical state of the connection system by introducing a compliant rubber element that can deform elastically. This parameter change from rigid metal-to-metal contact to flexible rubber contact allows the system to accommodate wear and vibration while maintaining reliable pin retention without becoming stuck or loose.
2Adaptability or versatility
If the ROPS is designed to be foldable for storage or transport, then space efficiency is improved, but the connection between upper and lower sections creates vibration and rattling during use
Solution Approach 1:
The rubber isolation member is positioned beforehand between the upper and lower ROPS sections to provide cushioning and vibration isolation. This pre-positioned cushioning element absorbs vibrations and prevents rattling during operation while still allowing the ROPS to be folded when needed, addressing both adaptability and vibration reduction requirements.
3Reliability
If retention pins fit tightly to prevent loosening, then reliability is improved, but the pins become difficult to remove and require tools for adjustment
Solution Approach 1:
The rubber isolation member changes the friction characteristics of the pin-hole interface by providing a compliant, self-adjusting fit. The rubber material maintains sufficient friction for reliable retention while allowing easy pin insertion and removal without tools, resolving the contradiction between tight fit reliability and ease of assembly.
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
Enables easy, tool-free folding and locking of the ROPS in raised or lowered positions, preventing rattling and ensuring retention pin stability, thereby enhancing safety and user convenience.
Implementation Method 1
an isolation member positioned between the upper and lower ROPS... can isolate the upper ROPS from the lower ROPS without rattling during use
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A folding rollover protection system (11) includes an upper ROPS (15) hinged to a lower ROPS (14) and movable between an upright position and a folded down position. An isolation member (25) may be urged between the upper and lower ROPS (15, 14) to separate them from each other. The isolation member (25) may be a resilient wedge-shaped member positioned between a first wedge (30) and a second wedge (31). The first wedge (30) is movable toward the second wedge (31) to urge the isolation member (25) against one of the ROPS (14, 15), isolating the upper ROPS (15) from the lower ROPS (14).