Fuel Tank Filler Neck Embedded Metal Threaded Part
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Solution Overview
Problem
Plastic fuel tanks face issues with sealing and assembly due to porous structures formed during production, deformation, and removal of metal threaded parts under vehicle vibrations, leading to increased production costs and duration.
Innovation Solution
A filler neck with a metal embedded part encircled by plastic, featuring a threaded body, inwardly curved body base, reinforcing holes, and a chain connection to prevent removal and deformation, enhancing mechanical holding and sealing without additional assembly steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the threaded part is assembled to the chamber housing after production, then the sealing property is improved, but deformations and damages occur in the chamber and the threaded part may be removed due to vibrations and torque
Solution Approach 1:
The patent combines the threaded part with the filler neck by embedding the metal threaded part into the plastic filler neck during the injection molding process. This merging of components ensures that the threaded part becomes an integral part of the filler neck structure, preventing separation under vibration and torque while maintaining sealing integrity through the unified construction.
Solution Approach 2:
The threaded part is pre-positioned and embedded into the filler neck before the final assembly of the fuel tank. This preliminary action during the molding process ensures proper positioning and structural integration, preventing subsequent deformations and damages that would occur if assembly were performed after production.
2Reliability
If O-ring is used for providing sealing during assembly, then sealing is improved, but production costs and production duration increase
Solution Approach 1:
The sealing function is merged into the filler neck structure itself through the embedded threaded part design. The metal threaded part creates a sealed connection with the chamber housing through its integrated structure, eliminating the need for separate O-ring sealing components and reducing assembly complexity.
Solution Approach 2:
The patent extracts the O-ring sealing component from the assembly process. The sealing function is achieved through the structural design of the embedded threaded part and filler neck integration, removing the need for additional sealing elements and their associated assembly steps.
3Ease of manufacture
If the filler neck is produced separately and then assembled, then the production process is simplified, but the sealing property deteriorates due to porous structures formed during rotation method
Solution Approach 1:
The production process merges the filler neck manufacturing with the fuel tank production by embedding the threaded part during the injection molding of the filler neck. This integrated approach eliminates the porous structures associated with separate rotation method production while maintaining manufacturing efficiency through consolidated production steps.
Solution Approach 2:
The filler neck is produced as a composite structure combining plastic material for the filler neck body and embedded metal material for the threaded part. This composite construction during injection molding ensures dense, non-porous structure with improved sealing properties while maintaining production efficiency.
Data Source
Figure 1~2b
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AI summary
The present invention is a filler neck (11) comprising a front section (32) encircled and covered by the fuel tank (10) cover (12) and which is embodied so as to encircle a metal embedded part (30) by means of plastic, said metal embedded part (30) comprising a threaded body (31) and provided at the continuation of said front section (32); said filler neck (11) is characterized in that said embedded part (30) comprises a body base (311) embodied in an inwardly curved form at the continuation of said threaded body (31), and a ring section (33) extending from said body base (311) into the threaded body (31).