Sliding-Sleeve Bicycle Drive Mounts for Tolerance and Noise Control
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Solution Overview
Problem
Existing fastening arrangements for attaching electric drives to bicycle frames face challenges in achieving mechanical stability, tolerance compensation, and noise reduction due to resonance amplification by hollow frames.
Innovation Solution
A fastening arrangement using a first screw with a sliding sleeve that allows for tolerance compensation and noise reduction, featuring a clearance fit and multiple components made of different materials to ensure mechanical stability and acoustic insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If through-bolts are used to attach electric drives to a bicycle frame, then mechanical stability is achieved, but mechanical stresses are introduced into the system
Solution Approach 1:
The patent introduces a sliding sleeve as an intermediary component between the through-bolt and the hollow frame. This sliding sleeve acts as a mediator that allows the through-bolt to pass through while enabling elastic deformation of the hollow frame, thereby reducing mechanical stresses in the system while maintaining mechanical stability through the bolt connection.
2Manufacturing precision
If the hollow frame is used to attach the electric drive, then tolerance compensation is possible through elastic deformation, but noise generated by the electric drive is amplified due to resonance
Solution Approach 1:
The patent extracts the noise amplification problem by introducing a damping element that specifically targets and counteracts the resonance effects of the hollow frame. This damping element is integrated into the fastening arrangement to absorb vibrations and reduce noise while preserving the tolerance compensation capability of the elastic hollow frame.
3Manufacturing precision
If a sliding sleeve with clearance fit is used, then tolerance compensation is achieved, but the fastening arrangement requires additional components and space
Solution Approach 1:
The patent merges multiple functions into the sliding sleeve component: it serves as both the tolerance compensation mechanism through its clearance fit with the hollow frame and as part of the fastening system by receiving the through-bolt. This integration reduces the number of separate components needed while maintaining the tolerance compensation function.
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 solution provides high mechanical stability, effective tolerance compensation, and noise reduction, minimizing mechanical stress and resonance amplification, while requiring minimal space and weight.
Implementation Method 1
Tolerance compensation is achieved here by elastic deformation in the area of the interface between the through-bolt and the frame
Implementation Method 2
the frame, as a hollow component, forms a resonant body, so that noise generated by the electric drive during operation is amplified by the hollow frame or leads to vibrations in the electric bicycle
Data Source
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AI summary
The present invention relates to a fastening arrangement, configured for fastening a device (2) to a hollow component (3), having two mutually opposite poles (31, 32), comprising a first screw (4) with a head (40) which is configured to be guided through a first hole (31) of the holes, and a sliding sleeve (6), with an outside diameter which is subject to tolerances, wherein the sliding sleeve (6) is configured to receive the first screw (4) at the second hole (32) of the holes, wherein an outside diameter of the sliding sleeve is displaceable in the axial direction (X-X) of the first screw by means of a clearance fit (9).