Motorcycle Fork Alignment Tool Using Receiving Cups
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Solution Overview
Problem
Aligning motorcycle forks to ensure proper suspension and handling, as existing methods rely on difficult centerline measurements on curved surfaces and often result in misalignment due to the cylindrical shape of the forks.
Innovation Solution
A tool with receiving cups configured to mate with the curved surfaces of the fork tubes and fork legs, featuring sliding members that can be adjusted and locked to capture the required spatial separation, allowing for easy alignment and secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If linear measuring devices such as tape measures are used to determine centerline spacing, then measurement capability is provided, but measurement precision deteriorates due to difficulty in determining centerlines on curved cylindrical surfaces
Solution Approach 1:
The patent introduces receiving cups as intermediary elements that mate with the curved fork tubes. These cups convert the curved surface into a flat reference plane, allowing linear measuring devices to accurately measure spacing between fork legs without directly measuring difficult-to-identify centerlines on curved surfaces.
Solution Approach 2:
The invention transitions from attempting to measure along the curved surface (one-dimensional approach) to measuring in a different dimension by using receiving cups that establish perpendicular reference planes. This dimensional change allows accurate measurement of the spacing dimension without being constrained by the curvature of the fork tubes.
2Ease of operation
If forks are aligned by working suspension up and down before tightening, then alignment process is simplified, but manufacturing precision deteriorates due to inability to securely lock alignment dimensions
Solution Approach 1:
The alignment tool employs sliding members that can move dynamically along the fork tubes during the alignment process, allowing the tool to adapt to the actual fork geometry. The sliding members can be locked into position at any point along the fork length, providing both ease of operation and secure locking of the alignment dimension.
Solution Approach 2:
The tool establishes the correct spacing dimension before tightening the fork legs to the axle. By measuring and locking the spacing while the forks are still adjustable, the alignment is secured prior to final assembly, ensuring precision is maintained throughout the process.
3Manufacturing precision
If adjustable sliding members are added to capture spatial separation, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The alignment tool is divided into separate functional segments: receiving cups for engaging fork tubes, sliding members for capturing spacing, and fasteners for locking. This segmentation allows each component to perform its specific function simply, and the overall device remains relatively straightforward despite the added adjustability.
Solution Approach 2:
The receiving cups serve multiple functions: they engage with the curved fork tubes, provide a flat reference surface for measurement, and act as mounting points for the sliding members. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Data Source
AI summary
A tool is disclosed for alignment of forks in a wheeled vehicle. The tool includes a plurality of connecting members, each having a receiving cup, which is configured to receive the curvature of fork tubes of the forks of the vehicle, and a slide bar which attaches to a portion of the receiving cup. The connecting members are held in slidable relation to each other by at least one fastener when the fastener is loosened. The fastener can be tightened to lock the connecting members in fixed position relative to each other to capture the spatial separation dimension between the forks at a point along their length. Also disclosed is a method for achieving parallelism of forks in a wheeled vehicle.