Stud Holder Elastic Locking Creep Deterioration
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Solution Overview
Problem
Existing temporary attachment systems for vehicles face issues with holder separation from studs due to creep deterioration, leading to loosening and detachment, as the engaging force decreases over time.
Innovation Solution
A stud with a threaded portion and a non-threaded portion featuring a non-threaded diameter-increasing section, combined with a holder having first and second locking portions that engage with the threaded and non-threaded portions respectively, allowing for elastic engagement and increased holding force by shifting the second locking portion to the non-threaded diameter-increasing section when the first locking portion's engagement weakens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a holder with multiple stud locking portions is used to increase holding force, then the holding force is improved, but the reliability deteriorates because the holder may rotate and detach when engaging force decreases due to creep deterioration
Solution Approach 1:
The locking mechanism is segmented into two distinct locking portions: a first locking portion that engages with the threaded portion of the stud, and a second locking portion that engages with the non-threaded portion. This segmentation ensures that if one locking portion deteriorates, the other continues to provide locking function, preventing holder detachment.
Solution Approach 2:
Different regions of the stud are given different functional qualities: the threaded portion provides rotational locking through thread engagement, while the non-threaded portion provides positional locking through diameter-based engagement. This local differentiation of functional qualities ensures comprehensive locking against both rotation and detachment.
2Adaptability or versatility
If the holder is designed with elastic engagement to accommodate creep deterioration, then the adaptability is improved, but the device complexity increases due to multiple locking portions and engagement mechanisms
Solution Approach 1:
The locking portions are designed with elastic engagement capabilities, allowing them to dynamically adjust to creep deterioration of the stud. The elastic material enables the locking portions to maintain engagement force despite dimensional changes in the stud, providing adaptability without requiring complex adjustment mechanisms.
Solution Approach 2:
The holder design integrates multiple locking functions into a single component structure. The first locking portion handles rotational locking while the second locking portion handles positional locking, both within the same holder body. This multi-functionality reduces the need for separate components and simplifies the overall assembly.
3Reliability
If a non-threaded diameter-increasing portion is added to the stud to enable second locking portion engagement, then the reliability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The stud geometry is modified by introducing a non-threaded diameter-increasing portion with specific dimensional parameters. This parameter change creates a distinct engagement zone for the second locking portion, providing reliable positional locking. The diameter-increasing portion's geometry is designed to be manufacturable with standard tolerances while ensuring adequate engagement.
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 configuration enhances the holding force and prevents rotation and loosening of the holder, ensuring it remains securely attached to the stud, even as the engaging force decreases, thereby preventing separation.
Implementation Method 1
a first locking portion which has a nail portion for fitting into said thread groove, and a second locking portion which has a nail portion for engaging with said non-thread portion of said rod-like portion, and said first locking portion can be elastically engaged with said threaded portion
Implementation Method 2
said first locking portion can be elastically engaged with said threaded portion and said second locking portion can be elastically engaged with said non-threaded portion
Data Source
AI summary
A threaded portion with thread groove formed and non-threaded portion without the thread groove are prepared on rod-like portion of stud, and non-threaded diameter-increasing portion whose outer diameter is increasing toward thread ridge of screw portion with thread groove formed and non-threaded small diameter portion connecting to small diameter region of non-threaded diameter-increasing portion and having same diameter as that of small diameter region are prepared at threaded portion side edge of non-threaded portion. A holder is provided with stud-receiving hole which receives the rod-like portion, a first locking portion and a second locking portion. The second locking portion is engaged with the non-threaded small diameter portion in a fixedly holding status, and the second locking portion is engaged with the non-threaded diameter-increasing portion in a status that the holder is moved for a predetermined amount in a direction away from the fixedly holding status.