Lower Fork Alignment System for Bicycle Suspension
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Solution Overview
Problem
Conventional bicycle fork manufacturing methods result in residual stress, causing the fork legs to bend and become non-parallel, leading to increased friction between upper and lower fork legs, which hampers the functionality of suspension systems.
Innovation Solution
A lower fork alignment system where the lower fork legs and brace are manufactured as separate pieces, allowing for horizontal and vertical adjustments via receiving and interfacing mechanisms, ensuring proper alignment and reducing friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If lower fork legs are cast as a single piece with the brace, then manufacturing complexity is reduced, but alignment precision deteriorates due to residual stress causing bending
Solution Approach 1:
The lower fork assembly is divided into separate components: the brace and the lower legs are manufactured independently rather than as a single cast piece. This segmentation allows each component to be produced without the residual stress issues of monolithic casting, and then assembled with precise alignment using the interfacing mechanisms described in the patent.
2Manufacturing precision
If lower fork legs are manufactured separately and assembled, then alignment precision is improved, but device complexity increases due to additional interfacing mechanisms
Solution Approach 1:
The interfacing mechanism acts as an intermediary between the separately manufactured brace and lower legs. It includes alignment features such as pinned joints or sliding interfaces that facilitate precise positioning during assembly, and stabilization features that maintain alignment after assembly, thereby enabling high precision without requiring overly complex permanent connections.
3Device complexity
If fork legs are cast as single piece, then device complexity is reduced, but friction increases due to non-parallel alignment
Solution Approach 1:
By segmenting the fork into separately manufactured components (brace and lower legs), the patent eliminates the residual stress-induced bending that occurs in cast single-piece forks. This ensures the lower legs remain parallel, thereby minimizing friction between the upper and lower fork legs during suspension operation.
4Manufacturing precision
If mid-assembly adjustments are enabled, then alignment precision is improved, but manufacturing time increases
Solution Approach 1:
The interfacing mechanism is designed with built-in alignment features (such as guide pins, slots, or keyed interfaces) that automatically establish correct alignment during assembly. This preliminary alignment capability reduces the need for time-consuming manual adjustments while still achieving high precision, as the components are pre-configured to fit together in the correct orientation.
Data Source
AI summary
A lower fork alignment system for a vehicle is described. The lower fork alignment system includes: a brace detachably coupling a first lower tube and a second lower tube of a lower fork, wherein the first and second lower tubes include: first and second receiving adjustment mechanism configured for receiving corresponding interfacing mechanisms of the brace, wherein upon receipt of alignment features of the interfacing mechanisms, one of the first lower tube and the second lower tube is enabled to be adjusted in a horizontal direction along a horizontal axis, and the other of the first lower tube and the second lower tube is enabled to be adjusted in a vertical direction along a vertical axis.