Threaded Bolt Frustoconical Tooth Cavity Hinge Loosening
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Solution Overview
Problem
Existing hinge arrangements for motor vehicle doors experience loosening of the screwed connection over time due to the toothing cutting into the hinge element, leading to a secure fixation challenge.
Innovation Solution
A threaded bolt with a frustoconical projection and a tooth that radially protrudes to secure against rotation, forming a cavity that collects material throw-ups and reduces the risk of loosening, featuring a cylindrical main body with a first frustoconical projection axially recessed relative to a second frustoconical projection, and a blind hole for screw fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a toothing is provided on the threaded bolt to prevent rotation, then the threaded bolt is secured against rotation relative to the hinge part, but the toothing cuts into the hinge part over time causing loosening of the screwed connection
Solution Approach 1:
A cavity is introduced as an intermediary space between the threaded bolt and the hinge part. This cavity receives and contains the material throw-ups generated when the tooth cuts into the hinge part, preventing these materials from affecting the screwed connection. The cavity acts as a mediator that isolates the harmful cutting action from the fastening function, allowing the tooth to provide rotation prevention while the cavity protects the connection integrity over time.
2Ease of operation
If the tooth extends radially outward to cut into the hinge part, then rotation is prevented, but material throw-ups occur that can influence the connection
Solution Approach 1:
The cavity transforms the harmful effect of material throw-ups into a beneficial containment system. Instead of allowing the materials to escape and interfere with the connection, the cavity captures and isolates them. The harmful cutting action that generates material throw-ups is thus converted into a controlled process where the throw-ups are contained within the cavity, maintaining connection integrity while preserving the rotation-prevention function.
Data Source
AI summary
A threaded bolt for a hinge arrangement includes a cylindrical main body. On an outer circumferential surface thereof the cylindrical main body has a first frustoconical projection and a second frustoconical projection, which adjoins the first frustoconical projection. The diameter of a side of the first frustoconical projection that faces toward the second frustoconical projection is smaller than the diameter of a side of the second frustoconical projection that faces toward the first frustoconical projection. The first frustoconical projection comprises at least one tooth on its outer circumferential surface, which tooth protrudes radially beyond an imaginary continuation of the second frustoconical projection.