Screw Dome Assembly With Tolerance Compensation for Low-Stress Fastening

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Solution Overview

Problem

Existing connecting domes, particularly screw domes, often result in stress or high-stress connections when fastening or connecting components, due to axial play and tolerance issues.

Innovation Solution

A connecting dome with an integrated tolerance compensation unit, comprising a base element, a compensating element, and a retainer, which is arranged within the dome's bore to compensate for axial play and tolerances, ensuring a stress-free or low-stress connection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional connecting domes are used for fastening components, then the connection is achieved, but axial play and tolerance issues cause stress or high-stress connections

Engineering Contradiction:
Improveconnection stress levelVSAvoidaxial tolerance compensation
Core Design Contradiction:
ReliabilityVSManufacturing precision

Solution Approach 1:

A tolerance compensation element is introduced as an intermediary component between the connecting dome and the component to be fastened. This element absorbs axial play and tolerance variations, preventing stress transmission to the connection. The compensation element acts as a mediator that decouples the rigid connection path, allowing for stress-free fastening despite manufacturing tolerances.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention changes the physical state or properties of the connection system by introducing a compliant tolerance compensation element that can deform or adjust to accommodate axial tolerances. This element transforms the rigid connection into a flexible one that can absorb dimensional variations without generating stress, effectively changing the mechanical parameters of the connection system.

Inventive Principle:
Principle #35Parameter changes

2Reliability

If a tolerance compensation unit is integrated into the connecting dome, then axial tolerances are compensated for, but the device complexity increases

Engineering Contradiction:
Improvestress-free connectionVSAvoidconnecting dome structure
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The tolerance compensation element is integrated directly into the connecting dome structure, merging two previously separate functions (connection and tolerance compensation) into a single unified component. This integration eliminates the need for separate compensation mechanisms while achieving the same effect, thereby reducing overall device complexity despite adding functionality.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The connecting dome is designed to perform multiple functions simultaneously: it provides mechanical connection, accommodates axial play, and compensates for tolerance variations. By making the connecting dome multi-functional, the invention eliminates the need for additional specialized components, thereby managing complexity while achieving stress-free connections.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250084891A1Connecting dome, in particular screw dome, and fastening assembly
Publication Date: 2025.03.13 WITTE AUTOMOTIVE GMBH
  • US20250084891A1 patent drawing
  • US20250084891A1 patent drawing
  • US20250084891A1 patent drawing

AI summary

A connecting dome for fastening at least one component and/or for connecting two components is provided. The connecting dome is designed as an assembly unit and may have a dome element with a longitudinal axis and a bore in which a tolerance compensation unit is arranged. A fastening assembly having the connecting dome is also provided.