Access Door Retention Structure for Overstress-Resistant Mounting
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Solution Overview
Problem
Existing retention mechanisms for removable access doors in hybrid vehicle 12-volt battery compartments are fragile and prone to breakage, and misalignment during mounting can cause overstress, leading to damage.
Innovation Solution
A retention mechanism featuring a resiliently deflectable stem with engagement heads and an overstress prevention structure, where the overstress prevention structure extends further than the retention tab to absorb deflection forces and prevent damage, and support walls to strengthen the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If retention features are made fragile and simple, then device complexity is reduced, but reliability deteriorates due to susceptibility to breakage
Solution Approach 1:
The patent applies beforehand cushioning by providing an overstress prevention structure that extends beyond the retention tab. This structure acts as a cushion or buffer that absorbs excessive forces before they reach the retention tab, preventing breakage while maintaining the simplicity of the retention mechanism. The overstress prevention structure is positioned to contact first during misalignment, cushioning the impact before the retention tab engages.
2Reliability
If retention features are made more robust, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the retention mechanism into distinct functional components: a retention tab for normal operation and an overstress prevention structure for protection. This segmentation allows each component to be optimized for its specific function - the retention tab remains simple while the overstress prevention structure provides robustness, avoiding the need to make the entire mechanism complex.
Solution Approach 2:
The overstress prevention structure serves as an intermediary element between the external environment and the retention tab. It mediates the interaction by absorbing excessive forces and preventing them from reaching the retention tab, thereby protecting the retention feature without requiring the retention tab itself to be more robust or complex.
3Ease of operation
If access door is dropped on floor surface, then ease of operation is maintained, but harmful factors increase due to breakage of retention features
Solution Approach 1:
The patent applies beforehand cushioning by positioning the overstress prevention structure to extend beyond the retention tab. When the access door is dropped or subjected to impact, the overstress prevention structure contacts first and absorbs the shock, cushioning the impact before it reaches the retention tab. This prevents breakage while maintaining ease of operation, as the retention tab remains accessible and functional.
4Ease of operation
If misalignment occurs during mounting, then ease of operation is affected, but harmful factors increase due to overstress of retention features
Solution Approach 1:
The patent applies beforehand cushioning by providing an overstress prevention structure that extends beyond the retention tab. During mounting, if misalignment occurs, the overstress prevention structure contacts first and absorbs the excessive forces, cushioning the impact before it reaches the retention tab. This prevents overstress damage while allowing some tolerance for alignment errors, improving ease of operation.
Solution Approach 2:
The overstress prevention structure serves as an intermediary that mediates between the mounting process and the retention tab. It absorbs misalignment stresses and prevents them from reaching the retention tab, allowing easier mounting with less precise alignment requirements while protecting the retention feature from damage.
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
The mechanism effectively secures the access door while preventing damage from overstress and misalignment, ensuring reliable sealing and protection of the battery compartment.
Implementation Method 1
The retention tab may include a resiliently deflectable stem and at least two engagement heads projecting from the stem
Data Source
AI summary
A retention mechanism for a removable access door includes a retention tab positioned along a side of the access door. The retention tab includes a resiliently deflectable stem and at least two engagement heads projecting from the stem. The tab extends to a first distance from a reference surface of the access door. An overstress prevention structure is positioned along the side of the access door so as to enable the retention tab to contact the overstress prevention structure when the stem is deflected a predetermined amount. The overstress prevention structure extends to a second distance from the reference surface, wherein the second distance is greater than the first distance. Support walls may strengthen the overstress prevention structure against forces exerted by the retention tabs during deflection of the tabs. The support walls may form a protective “shroud” around the retention tab.