Bicycle Front Fork Lubrication Recesses for Lower Bushing Friction
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Solution Overview
Problem
Suspension forks in bicycles experience increased friction at the interface between upper tubes and bushings, leading to harsh riding feedback due to insufficient lubrication, which affects damping force and overall riding comfort.
Innovation Solution
Incorporation of recesses, dimples, or cavities on the outer surface of the upper tube to collect and distribute lubricating oil to the interface between the upper and lower tubes, ensuring continuous lubrication and reducing friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If suspension forks use telescopic upper and lower tubes with bushings, then cushioning and vibration absorption are improved, but friction increases at the interface between upper tubes and bushings
Solution Approach 1:
The recesses on the upper tube collect and store lubricating oil in advance during the compression stroke, preparing the lubricant for distribution to the bushing interface during the rebound stroke, ensuring continuous lubrication without additional lubrication systems
Solution Approach 2:
The recesses act as intermediary structures that facilitate the transfer of lubricating oil from the lower tube interior to the bushing interface, enabling effective lubrication of the friction area without requiring direct injection or additional lubrication components
2Force
If sufficient lubricating oil is provided in the lower tube interior, then friction reduction is improved, but oil distribution to the bushing interface becomes insufficient
Solution Approach 1:
The recesses create additional volume on the outer surface of the upper tube, providing a third dimension for oil storage and distribution. This allows oil to be collected during compression and redistributed during rebound, solving the distribution insufficiency problem without increasing the total oil quantity in the lower tube
3Adaptability or versatility
If the upper tube and lower tube are moved frequently between extended and contracted positions, then suspension performance is improved, but lubrication effectiveness decreases due to friction
Solution Approach 1:
The recesses enable periodic lubrication action that synchronizes with the suspension's compression and rebound cycles. During each compression stroke, oil is collected in the recesses; during each rebound stroke, oil is distributed to the bushing interface, creating a periodic lubrication pattern that maintains effectiveness throughout frequent suspension movements
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 lubrication features ensure smooth sliding movement between the upper and lower tubes, mitigating frictional effects and providing a smoother ride over time by maintaining effective damping and reducing harsh feedback.
Implementation Method 1
The recess is to collect an amount of oil when the upper tube is moved into the lower tube
Implementation Method 2
The recess is to distribute the amount of oil to the bushing when the upper and lower tubes are moved toward the fully extended position
Data Source
AI summary
Bicycle front forks having features to distribute lubricant are disclosed herein. An example front fork includes a lower tube having a first top end and a first bottom end, the lower tube defining an interior region to contain a volume of oil, a bushing coupled to an inner surface of the lower tube, and an upper tube having a second top end and a second bottom end opposite the second top end, the second bottom end disposed in the lower tube, the upper tube in sliding contact with the bushing, the upper and lower tubes arranged in a telescopic arrangement and moveable between a fully extended and a fully contracted position, the upper tube having a recess, the recess to collect oil when the upper tube is moved into the lower tube and distribute the oil to the bushing when the tubes are moved toward the fully extended position.