Door Holder Retaining Rod Brake Force Design
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Solution Overview
Problem
Existing door holders for motor vehicles face issues with low retaining forces, noise generation, corrosion of spring wire sections, and complex maintenance due to their design, making them unsuitable for regular vehicle use.
Innovation Solution
A door holder design featuring a retainer housing with a door retaining rod that incorporates both primary and secondary brake force components, where the secondary brake force component assists the primary force to enhance retaining capabilities without increasing the installation space or weight, and includes guide elements that can be independently set to optimize the brake force curve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If spring wire sections are used to generate brake force, then a primary brake force component is achieved, but noise is generated and corrosion occurs
Solution Approach 1:
The patent changes the material parameter from spring wire sections to elastomeric material, which fundamentally alters the physical and chemical properties. The elastomeric material provides the necessary elastic deformation for brake force generation while being inherently resistant to corrosion and significantly reducing noise generation through its damping properties.
Solution Approach 2:
The elastomeric brake elements are designed as replaceable components that can be easily exchanged when worn. This approach allows using simpler, less durable materials that can be replaced rather than maintained, reducing the complexity of corrosion protection and noise mitigation systems.
2Force
If spring wire sections are exposed on the housing, then brake force is generated, but the risk of corrosion increases
Solution Approach 1:
The patent changes the material parameter from spring wire sections to elastomeric material, which fundamentally alters the physical and chemical properties. The elastomeric material provides the necessary elastic deformation for brake force generation while being inherently resistant to corrosion and significantly reducing noise generation through its damping properties.
Solution Approach 2:
The elastomeric brake elements are designed as replaceable components that can be easily exchanged when worn. This approach allows using simpler, less durable materials that can be replaced rather than maintained, reducing the complexity of corrosion protection and noise mitigation systems.
3Force
If additional openings and plate bodies are added to guide spring wire sections, then the brake force is enhanced, but the structural height increases
Solution Approach 1:
The patent merges the guide structure and brake element into a single integrated elastomeric component. The guide surfaces are formed directly on the elastomeric brake element itself, eliminating the need for separate guide openings and plate bodies, thus maintaining a compact structural height while providing the necessary guidance and brake force.
Solution Approach 2:
The elastomeric brake element serves multiple functions simultaneously: it generates brake force through elastic deformation, guides the retaining rod through integrated guide surfaces, and provides damping. This multi-functionality eliminates the need for separate components and reduces the overall structural height.
4Force
If spring wire sections are deformed with respect to the retainer housing, then brake force is generated, but large travels are required
Solution Approach 1:
The patent changes the material parameter from spring wire sections to elastomeric material, which fundamentally alters the physical and chemical properties. The elastomeric material provides the necessary elastic deformation for brake force generation while being inherently resistant to corrosion and significantly reducing noise generation through its damping properties.
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 door holder achieves higher retaining forces while maintaining a lightweight and compact design, reducing noise and corrosion risks, and simplifying maintenance by allowing for adjustable brake force components and material selection to enhance friction coefficients.
Implementation Method 1
an elastomeric brake element which can be pressed against the retaining rod and generates a primary brake force component against displacement of the retaining rod
Implementation Method 2
the guide element can be pressed against the guide surface and generates a secondary brake force component against displacement of the retaining rod
Data Source
AI summary
A door holder, includes a retainer housing (230), which can be connected either to a door or a door frame, and a door retainer rod, which penetrates the retainer housing (230) and which can be articulated to the other of the door and the door frame The door retainer rod has at least one braking surface, and at least one braking element (50) that can be displaced toward the at least one braking surface is arranged on the retainer housing (230), which the braking element can be brought in contact with the at least one braking surface of the door retainer rod at least in some sections and thus produces a primary braking force component against the displacement of the door retainer rod, wherein the door retainer rod has at least one guiding surface, which is inclined with respect to the braking surface. A door holder that provides high holding forces at least in some sections is created in that at least one guiding element (235a, 235b) is arranged on the retainer housing (230), which the guiding element can be brought in contact with the at least one guiding surface at least in some regions and produces a secondary braking force component against the displacement of the door retainer rod.