Vehicle Hinge Retaining Device for Reliable Door Locking
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Solution Overview
Problem
Existing temporary retaining devices for vehicle doors are unreliable due to tolerance deviations and can cause damage from uncontrolled pivoting, as they are susceptible to hinge bolt displacement and require complex threading for secure locking.
Innovation Solution
A temporary retaining device with a load arm and retaining lug, designed to decouple pivoting directions and featuring a flat counter-surface and guide bevel for secure engagement with a U-shaped stop part, allowing for easy assembly and reliable locking without threading, and an elastic fold for adaptability to component tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temporary retaining device with a hinge bolt is used to lock the vehicle door, then the door can be held in an open position, but the hinge bolt can displace vertically and come loose from the lower hinge eye, causing uncontrolled pivoting and potential door damage
Solution Approach 1:
The retaining device is segmented into distinct functional components: a flat portion for positioning, a load arm for force application, and a retaining lug with guide bevel for engagement. This segmentation allows each component to perform its specific function reliably without interfering with others, preventing the hinge bolt displacement problem.
Solution Approach 2:
The retaining lug acts as an intermediary element between the load arm and the stop part on the hinge. It provides a controlled engagement interface with the guide bevel that mediates the interaction, ensuring forces are transmitted through a defined path that prevents uncontrolled pivoting and hinge bolt loosening.
2Reliability
If complex threading is used to secure the hinge bolt, then the locking reliability improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
The threading function is extracted and replaced by a simpler engagement mechanism. The retaining lug with its guide bevel provides secure locking through geometric interlocking and elastic deformation of the load arm, eliminating the need for complex threaded fasteners while maintaining reliability.
Solution Approach 2:
The engagement mechanism utilizes parameter changes in the elastic properties of the load arm. The load arm is designed to elastically deform during engagement, creating a interference fit that provides secure locking without threading. This parameter-based approach simplifies the device while maintaining reliability.
3Reliability
If the retaining device is designed to be secure and reusable, then the manufacturing cost increases, but if it is disposable, then reliability decreases due to tolerance deviations
Solution Approach 1:
The fold is designed with specific elastic properties that allow it to adapt to tolerance variations in the hinge components. By utilizing elastic deformation parameters, the device can accommodate manufacturing tolerances while maintaining reliable engagement, enabling reuse without compromising functionality.
Solution Approach 2:
The fold provides dynamic adaptability through elastic deformation. Rather than relying on rigid geometric fits that are sensitive to tolerances, the elastic fold dynamically adjusts to the actual dimensions of the hinge components, ensuring reliable engagement across multiple uses while keeping manufacturing costs reasonable.
4Reliability
If the flat portion is displaced vertically to lock the device, then the door is secured, but the hinge bolt can also displace and come loose from the lower hinge eye
Solution Approach 1:
The vertical displacement locking mechanism is extracted and replaced by a lateral engagement mechanism. The retaining lug engages with the stop part through lateral movement guided by the guide bevel, eliminating the vertical displacement action that causes hinge bolt loosening while maintaining secure locking.
Solution Approach 2:
The guide bevel of the retaining lug serves as an intermediary that redirects the locking action. Instead of vertical displacement that affects the hinge bolt, the guide bevel converts the motion into lateral engagement with the stop part, securing the door while maintaining hinge bolt stability.
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 solution provides a reliable, cost-efficient, and safe means to temporarily lock vehicle doors open during painting, ensuring reproducibility and preventing door closure during transport, while allowing easy removal and reuse without damaging the hinge components.
Implementation Method 1
a fold protruding from an edge of the flat portion
Implementation Method 2
a load arm extending from the flat portion, with the load arm having a projection in the form of a retaining lug at an end facing away from the flat portion
Data Source
AI summary
A temporary retaining device for use in a vehicle hinge to temporarily lock a vehicle door in an open position relative to a door frame includes a flat portion in which an opening is arranged. A fold protrudes from an edge of the flat portion. A load arm extends from the flat portion. The load arm comprises a projection formed as a retaining lug on an end facing away from the flat portion.