Friction-Coated Screw Connection for Single-Tool Assembly
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Solution Overview
Problem
Existing screw connection arrangements require two tools for assembly, which can be difficult to manage in hard-to-reach areas, and there is a need for a solution that simplifies assembly while maintaining secure and reliable fixation.
Innovation Solution
A screw connection arrangement with a screw and screw nut featuring a tribological system that increases friction coefficient through coatings or layers on the nut body, washers, and screw head, allowing single-tool assembly by reducing the need to hold the nut during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two tools are used for assembly (one for screw head, one for nut), then secure fixation is achieved, but assembly becomes difficult in hard-to-reach areas
Solution Approach 1:
The patent introduces a washer with a specifically designed profile that acts as an intermediary element between the nut and the component surface. This washer features a bearing surface that contacts the component and a counter-bearing surface that contacts the nut, allowing the assembly to function with only one tool applied to the screw head, while maintaining secure fixation through the distributed contact surfaces.
Solution Approach 2:
The assembly is segmented into distinct functional elements: the screw, the nut, and the washer with differentiated surfaces. The washer is further segmented into a bearing surface for component contact and a counter-bearing surface for nut contact, allowing each element to perform its specific function independently, enabling single-tool operation while maintaining reliability.
2Object-affected harmful factors
If washer is used to distribute force over larger area, then surface damage is prevented, but device complexity increases
Solution Approach 1:
The washer is designed with local quality differentiation through its dual-surface profile. The bearing surface has specific geometric characteristics optimized for contacting the component surface, while the counter-bearing surface has different characteristics optimized for contacting the nut. This localized differentiation allows the single washer element to perform multiple protective functions without adding significant complexity.
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 tribological system enhances assembly ease by allowing single-tool operation, ensuring secure and reliable fixation without damaging surfaces, even in hard-to-reach areas.
Implementation Method 1
a tribological system which increases a friction coefficient between the nut body and a surface contacting the nut body
Data Source
AI summary
A screw connection assembly comprises a screw comprising a screw body with a screw shaft, which bears a threading, in particular an outer threading, at least in sections. The screw connection assembly can further comprise a screw nut serving and/or configured as a counterpart to the screw, which screw nut comprises a nut body having a threading corresponding to the threading of the screw shaft, in particular an inner threading, and which is or can be screwed onto the screw shaft. It can be provided in particular that the nut body of the screw nut at least partially or regionally bears a layer, in particular a coating, which tribologically increases a coefficient of friction between the nut body of the screw nut and a surface contacting the nut body of the screw nut in the assembled state of the screw connection assembly.