Motor Vehicle Door Holding Device with Protective Wall
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Solution Overview
Problem
Existing door leaf holding devices for motor vehicles generate dust and paint defects during assembly due to abrasion and paint retention, leading to aesthetic issues and inefficiencies in maintaining the ajar position.
Innovation Solution
A holding device comprising a first element with a connecting member and a second element with an elastically deformable body, housed in a protective wall, which opposes door leaf displacement and prevents paint from entering the housing, reducing dust and paint flaking, and includes abutment surfaces to maintain the door in an ajar position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retaining elements such as tabs are used to hold the door leaf element, then the door can be effectively held in the ajar position, but grains or dust are generated by abrasion and tearing of the plastic material and paint
Solution Approach 1:
The harmful function of the retaining element (generating grains and dust through abrasion) is extracted and eliminated by replacing the traditional tab with an elastically deformable body that deforms elastically rather than through friction and abrasion
Solution Approach 2:
The retaining element is transformed from a rigid tab to an elastically deformable body, changing the mechanical parameter from rigid contact to elastic deformation, which eliminates abrasion and grain generation while maintaining the holding function
2Device complexity
If a single retaining element is used, then the device structure is simple, but paint defects are generated at the fixing zone and paint is retained and projected during manipulation
Solution Approach 1:
The solution moves from a single-point retaining element to a distributed array of multiple retaining elements, adding spatial distribution as a new dimension. This distributes the paint retention issue across multiple small contact points rather than one large contact area, reducing visible defects
Solution Approach 2:
The single retaining element is segmented into multiple smaller retaining elements (tabs), which distributes the paint contact and retention across multiple small areas rather than one large area, reducing the visibility and impact of paint defects
3Ease of operation
If the elastically deformable body is exposed, then it can freely cooperate with the connecting member, but paint can enter the receiving housing and be deposited on functional parts causing flaking and dust generation
Solution Approach 1:
The elastically deformable body is nested within the receiving housing, which is partially enclosed by the protective wall. This nested structure allows the deformable body to function freely while being protected from paint contamination by the housing and protective wall
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 device effectively holds the door in an ajar position, prevents paint and dust from causing defects, and ensures ergonomic installation and use by containing paint and dust, thus enhancing manufacturing efficiency and aesthetics.
Implementation Method 1
a retaining member comprising at least one elastically deformable body, configured to cooperate with a second zone of the at least one connecting member so as to oppose the displacement of the door leaf element with respect to the fixed part in the opening direction of the door leaf element
Data Source
AI summary
A device for holding an opening element in an ajar position relative to a fixed part of a body of a motor vehicle, the device including a first element having at least one connection member and a second element having at least one retention member having at least one elastically deformable body configured to cooperate with a second area of the at least one connection member so as to prevent the opening element from opening; the holding device comprises at least one protective wall defining a receiving recess in which the at least one elastically deformable body is at least partially housed. The invention also relates to a vehicle provided with at least one holding device of the type mentioned above.