Support Plate Screw Mounting via Embossed Form Fit
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Solution Overview
Problem
Existing spring or damping elements in rail vehicles face challenges with high-strength screws, as materials used do not meet welding suitability standards, and conventional welding methods are inadequate for securing these screws against twisting and axial displacement.
Innovation Solution
A carrier plate with a raised embossing around the bore to prevent twisting and a deformation process to achieve axial fixation, using standard parts and tools like a cylindrical hollow punch for radial constriction, allowing secure attachment without welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-strength screws (strength class 8.8 or higher) are used for secure attachment, then the fastening strength is improved, but the welding suitability deteriorates because these materials do not meet welding requirements
Solution Approach 1:
The patent replaces the welding process (thermal/chemical joining) with a mechanical interference fit system. The screw is inserted through a bore in the carrier plate and secured through mechanical means (form fit between screw head and carrier plate surface, and thread engagement with the bore), eliminating the need for welding high-strength screw materials.
2Reliability
If conventional welding methods are used to secure screws against twisting and axial displacement, then the fixation security is improved, but the complexity of meeting welding regulations and material suitability increases
Solution Approach 1:
The patent replaces complex welding processes and regulatory compliance requirements with a straightforward mechanical interference fit system. The form fit between the screw head and carrier plate surface, combined with thread engagement, provides reliable fixation against twisting and axial displacement without requiring welding expertise or regulatory approvals.
3Reliability
If welded connections are used to prevent screw twisting and axial displacement, then the security against twisting is improved, but the cost and manufacturing simplicity deteriorate due to material requirements and welding processes
Solution Approach 1:
The patent replaces expensive welding processes and specialized material requirements with a simple mechanical interference fit system using standard high-strength screw materials. The carrier plate bore and screw head geometry are designed to create form fit, preventing twisting and axial displacement through purely mechanical means that are simpler and more cost-effective than welding.
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
This solution provides a secure and cost-effective attachment method for high-strength screws, ensuring compliance with standards and regulations by preventing screw twisting and axial displacement, while using inexpensive standard parts.
Implementation Method 1
The support plate has a raised embossing in the area of the bore, which protrudes towards the screw head and which positively rests against parts of the outer circumference of the screw head and thus surrounds it in such a way that the screw is prevented from twisting.
Implementation Method 2
the screw is fixed by a deformation of the support plate material, which is carried out after it has been inserted into the support plate and serves to radially narrow the borehole.
Data Source
AI summary
Support plate (1) comprising a threaded element for screw-fastening accessory parts, which are fastened to the support plate, to rail vehicles, the threaded element being designed as a standard screw (2) and projecting through a bore (3) of the support plate, the support plate having an embossed portion (6, 7) in the zone of the bore, said embossed portion being raised and projecting towards the screw head and resting on parts of the outer circumference of the screw head in a form-locking manner.