Angled Screw-Bushing Joint for Plastic-to-Metal Tolerance Fit
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Solution Overview
Problem
Existing screw connection systems for connecting plastic and metal components, particularly in internal combustion engine applications, lack reliability and ease of use, often requiring additional tools and clamping strips, and suffer from poor tolerance behavior.
Innovation Solution
A screw connection system featuring a screw with an external thread guided in a bushing that extends at an angle through bores in both the plastic and metal components, allowing for easy assembly and disassembly without auxiliary tools, using a two-part system with a thin shank screw and a bushing with an inner thread for secure and reliable connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional screw connection system is used to connect plastic and metal components, then the connection can be established, but the system requires additional clamping strips and auxiliary tools, increasing device complexity
Solution Approach 1:
The invention merges the clamping strip function and screw function into a single integrated screw component. The screw head with integrated clamping element combines multiple fastening functions that were previously separated, reducing the number of components while maintaining reliable connection between plastic and metal components.
Solution Approach 2:
The screw component is designed with multi-functionality, serving both as a fastening element and a clamping element. The integrated clamping strip function within the screw head allows the single component to perform multiple fastening tasks, eliminating the need for separate clamping strips and auxiliary tools.
2Ease of operation
If a traditional screw connection system is used, then connection can be established, but assembly and disassembly require auxiliary tools, reducing ease of operation
Solution Approach 1:
The integrated screw design with built-in clamping functionality enables self-service assembly and disassembly. The screw component can be installed and removed using only standard screwdriver tools, without requiring additional auxiliary tools or specialized equipment, as the clamping action is automatically achieved during screw insertion.
3Manufacturing precision
If conventional screw connection systems are used for slanted connections, then installation space can be saved, but tolerance behavior deteriorates
Solution Approach 1:
The invention segments the fastening function into distinct zones: the screw head provides clamping in one plane while the threaded shaft provides anchoring in another. This segmentation allows the slanted screw connection to accommodate dimensional tolerances and misalignments more effectively, improving manufacturing precision without requiring additional installation space.
Data Source
AI summary
A screw connection system connecting a plastic component with a metal component has a bushing and a screw with a screw shank and an external thread arranged on the screw shank. The screw is captively guided in the bushing. The bushing, in a screw-connected state of the screw connection system, extends with a first section in a bore of the plastic component and with a second section in an aligned bore of the metal component aligned with the bore of the plastic component. The bore of the plastic component and the aligned bore of the metal component are positioned at an angle relative to a vertical line on joining surfaces of the plastic component and of the metal component adjoining each other in the screw-connected state. The bushing is movable out of the plastic component when screwing the screw into the metal component.