Vehicle Door Handle Coupling to Prevent Pull-Out Detachment
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Solution Overview
Problem
Existing vehicle door handle designs are prone to detachment due to twisting forces applied to the shaft portion, leading to potential disengagement from the bearing holes, especially when a pull-out force is applied.
Innovation Solution
A door handle device with an operation handle that restricts movement towards the rotation tip end by elastically engaging a stopper protruding portion with elastic pieces and a clip, using elastic deformation to prevent detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operation handle is coupled to the handle base with a sliding operation using elastic pieces, then the operation handle can be easily installed and removed, but the engagement may be released when a pull-out force is applied due to twisting forces on the shaft portion
Solution Approach 1:
The coupling mechanism is divided into multiple functional components: elastic pieces for initial engagement, stopper protruding portion for positioning, and clip for securing. This segmentation allows each component to perform its specific function, with the clip preventing the elastic pieces from disengaging under pull-out forces while maintaining easy installation through the elastic engagement mechanism.
Solution Approach 2:
The clip is预先 installed on the handle base to prevent the elastic pieces from moving in the disengagement direction before any pull-out force is applied. This preliminary anti-action counteracts the potential harmful effect of twisting forces that would otherwise cause the engagement to release during operation.
2Ease of operation
If the elastic pieces are allowed to deform freely to enable stopper engagement, then the operation handle can be easily coupled, but the stopper protruding portion may inadvertently detach under pull-out force
Solution Approach 1:
The elastic pieces are designed to be dynamically deformable during the coupling process, allowing the stopper protruding portion to engage easily. However, once engaged, the clip provides a static constraint that prevents the elastic pieces from deforming in the disengagement direction, thereby maintaining engagement stability under pull-out forces.
Solution Approach 2:
The clip is positioned specifically to restrict the elastic pieces only in the disengagement direction, while allowing them to deform freely in other directions needed for coupling. This localized constraint maintains both ease of coupling and engagement stability by permitting necessary deformation while preventing harmful detachment.
3Ease of operation
If the bending portions are made thin to enable flexible engagement with the groove portions, then the operation handle can be easily rotated into position, but the bending portions are prone to twisting and detachment under pull-out force
Solution Approach 1:
The support arm is segmented into multiple functional regions: thin plate-shaped bending portions for flexible engagement and rotation, and a reinforced shaft portion with the stopper protruding portion for withstanding pull-out forces. This segmentation allows the thin bending portions to provide ease of rotation while the reinforced shaft portion maintains strength against twisting and detachment.
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 elastic deformation is further restricted by the clip, ensuring the stopper protruding portion remains engaged, thereby reducing the likelihood of the operation handle detaching from the handle base.
Implementation Method 1
movement of the operation handle 2 toward a rotation tip end is restricted by elastically engaging a stopper protruding portion 5 formed on any one of a coupling protruding portion 3 that is provided at an end portion on a rotation center (C2) side of the operation handle 2 and elastically deformable elastic pieces 4 that are adjacent to the coupling protruding portion 3 in the handle base 1 with a stopper fitting portion 6 formed on the other by using elastic deformation of the elastic pieces 4
Implementation Method 2
movement of the elastic pieces 4 in a disengagement direction of the stopper protruding portion 5 is restricted by a clip 7 mounted on the handle base 1
Data Source
AI summary
A door handle device for a vehicle includes a handle base fixed to a door of a vehicle, and an operation handle rotatably coupled to the handle base. The operation handle includes a coupling protruding portion that is provided at an end portion on a rotation center side of the operation handle. The handle base includes an elastically deformable elastic piece that is adjacent to the coupling protruding portion. Movement of the operation handle toward a rotation tip end is restricted by elastically engaging a stopper protruding portion formed on any one of the coupling protruding portion and the elastic piece with a stopper fitting portion formed on the other by using elastic deformation of the elastic piece. Movement of the elastic piece in a disengagement direction of the stopper protruding portion is restricted by a clip mounted on the handle base.