Self-Locking Bearing Preload Adjuster for Bicycle Bottom Brackets
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Solution Overview
Problem
Adjusting the bearing preload in a bicycle bottom bracket assembly requires various tools and frequent readjustment, complicating the process and potentially leading to overloading or underloading of bearings, which affects performance and longevity.
Innovation Solution
A self-locking preload adjuster system that uses an adjustment ring, movable plunger, and detent spring to apply preload to ball bearings without tools, featuring a triple-start thread for precise control and a gasket to protect the bearings from dirt and water, allowing for easy adjustment and maintaining preload consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional bearing preload adjustment methods are used, then bearing preload can be applied, but the process requires various tools and frequent readjustment, complicating the operation
Solution Approach 1:
The preload adjuster is designed to be self-contained with an integrated adjustment mechanism that does not require external tools. The system includes a preload adjusting component with threaded engagement that allows direct manual adjustment, and a locking mechanism that automatically secures the adjustment without requiring additional tools or procedures.
Solution Approach 2:
The invention combines multiple functions into a single integrated component: the preload adjustment function, the locking function, and the protection function (via integrated seal) are all merged into one preload adjuster assembly, eliminating the need for separate tools and procedures for each function.
2Reliability
If traditional preload adjustment is performed, then bearing preload can be set, but overloading or underloading may occur, affecting bearing performance and longevity
Solution Approach 1:
The preload adjuster incorporates a locking mechanism that provides mechanical feedback to maintain the set preload value. The locking component engages with the adjusting component to prevent both over-adjustment and under-adjustment, ensuring the bearing preload remains within optimal parameters without requiring user judgment or multiple readjustments.
3Stability of the object's composition
If bearings are preloaded to eliminate lateral movement, then crank set stability is improved, but the adjustment process becomes complex requiring multiple tools and readjustments
Solution Approach 1:
The preload adjuster is pre-configured with an integrated locking mechanism and sealing system that are ready to function immediately upon installation. The locking component is designed to engage automatically at predetermined intervals during adjustment, providing preliminary stabilization that prevents the need for multiple readjustment cycles.
4Reliability
If bearing preload is adjusted frequently, then optimal performance can be maintained, but time is lost and the process becomes cumbersome
Solution Approach 1:
The locking mechanism provides self-service functionality by automatically securing the preload adjustment at predetermined positions without requiring user intervention or additional tools. This prevents accidental changes and eliminates the need for frequent readjustments, maintaining bearing performance consistency over time.
Solution Approach 2:
The locking mechanism is designed to engage at periodic intervals during the adjustment process, providing stable locking positions that maintain optimal bearing preload. This periodic engagement ensures consistent performance without requiring continuous monitoring or adjustment.
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
Simplifies the preload adjustment process, eliminates free play in the bearing system, prevents overloading, and ensures consistent performance by allowing users to set preload manually, ensuring optimal bearing performance without the need for tools and reducing maintenance.
Implementation Method 1
a detent spring. In some embodiments, the detent spring prevents the movable plunger from backing out once it has been moved in order to apply preload to the one or more bearings of the bottom bracket
Implementation Method 2
In some embodiments, the bearing preload adjuster comprises a triple-start thread which is used to apply preload to the bearings
Data Source
AI summary
A bearing preload adjuster for a bicycle crank set and bottom bracket comprises an adjustment ring for coupling with a bicycle crank arm, a movable plunger comprising an external thread for rotatably coupling with the adjustment ring. The adjustment ring is rotated in order to cause the plunger to extend along an axis of the bottom bracket and apply pressure to a bottom bracket bearing inner race. The adjustment ring is rotated until the clearance in the bearing assemblies and the play in the bottom bracket assembly has been eliminated. This allows the crank assembly to rotate freely, while preventing the crank assembly from sliding side to side inside the bearing bores and along the axis of the crank spindle.