Fork Top Bridge Clamping Collar for Steer Tube Retention
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Solution Overview
Problem
Fork top bridges for motorcycles and bicycles face issues with clamping collars that are self-inhibiting in only one direction of rotation, leading to loosening under torsional moments, which results in deformation of the steer tube and impaired telescoping fork function.
Innovation Solution
A fork top bridge design featuring clamping collars with two clamping tongues extending in opposite circumferential directions, allowing secure retention with reduced clamping forces and minimizing steer tube deformation, achieved by offsetting the clamping tongues to evenly distribute stress and maintain precise function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high clamping force is applied to prevent loosening under torsional moments, then the steer tube can be securely retained, but the steer tube becomes deformed and the telescoping fork function is impaired
Solution Approach 1:
The clamping collar is segmented into two separate clamping tongues that can be independently positioned at 180 degrees apart. This segmentation allows each tongue to independently engage with the steer tube, distributing the clamping force more evenly and preventing the concentration of stress that causes deformation while maintaining secure retention.
Solution Approach 2:
The clamping tongues are positioned asymmetrically at opposite sides of the collar (180 degrees apart) rather than stacked vertically. This asymmetric arrangement creates opposing clamping forces that balance each other, preventing rotational loosening without requiring excessive clamping force that would deform the steer tube.
2Device complexity
If clamping collars are self-inhibiting in only one direction of rotation, then the structure is simple, but the collar loosens under torsional moments acting in the opposite direction
Solution Approach 1:
The single clamping tongue is divided into two separate tongues positioned at opposite sides of the collar. Each tongue independently resists rotational forces in its respective direction, providing bidirectional anti-loosening capability without requiring a complex multi-component system.
Solution Approach 2:
The two clamping tongues are positioned to create counterbalancing forces that resist rotational loosening in opposite directions. When a torsional moment acts on the steer tube, one tongue engages to prevent loosening while the other provides counterbalancing support, effectively creating a self-locking mechanism in both rotational directions.
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 ensures reliable retention of the steer tube with reduced deformation, allowing for smooth and precise operation of the telescoping fork by evenly distributing clamping forces and reducing the risk of loosening.
Implementation Method 1
a frictional force acts on the clamping tongue or clamping tongues, which force seeks to move the clamping tongue or clamping tongues in the opening direction
Data Source
AI summary
According to the invention, a fork crown for connecting fork tubes of a motorbike or bicycle includes clamping collars with at least two clamping tongues which extend from a collar base in opposite peripheral directions.