Indoor Cycle Resistance Assembly With Fine-Tuned Magnetic Braking
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Solution Overview
Problem
Existing exercise equipment, particularly indoor cycles, face issues with variable resistance systems that require frequent repairs and replacements due to wear and tear, leading to inconsistent resistance and inaccurate energy measurement, with magnetic resistance systems offering limited fine-tuning and abrupt resistance changes.
Innovation Solution
An adjustable resistance system using a combination of magnetic and frictional resistance, featuring a fixed and pivotable arm design with magnets that scissor together to provide variable resistance, and a strain gauge or load cell to measure energy exerted, allowing for precise resistance adjustment and accurate energy measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If friction brakes are used to vary resistance on the flywheel, then resistance can be adjusted, but the brake pad wears down over time causing inconsistent resistance and requiring repairs
Solution Approach 1:
The patent replaces the friction-based mechanical brake system with a magnetic resistance system using magnets that interact with the flywheel. This substitution eliminates physical contact between brake pads and flywheel, preventing wear and maintaining consistent resistance characteristics over time while still allowing variable resistance adjustment.
Solution Approach 2:
The patent changes the resistance mechanism from friction-based to magnetic-based, altering the fundamental physical parameter from contact friction to magnetic field interaction. This parameter change enables resistance adjustment without the wear problems inherent in friction systems.
2Ease of operation
If magnets are positioned on movable arms that lower towards the flywheel to increase resistance, then resistance can be varied, but the resistance increases abruptly with very little adjustment
Solution Approach 1:
The patent segments the magnetic resistance system into multiple independent magnets arranged in series around the flywheel, rather than using a single magnetic assembly. This segmentation allows each magnet to contribute incrementally to the total resistance, enabling fine-grained adjustment and smooth resistance variation.
Solution Approach 2:
The patent implements a movable arm mechanism that can dynamically adjust the position of multiple segmented magnets relative to the flywheel. This dynamic positioning system allows for precise control over the magnetic interaction strength, enabling smooth and incremental resistance changes rather than abrupt transitions.
3Device complexity
If the same brake pad is used for both variable resistance and emergency braking, then the system is simpler, but the emergency brake effectiveness is affected as the pad wears out
Solution Approach 1:
The patent replaces the friction-based emergency brake system with a magnetic braking system that uses the same magnetic field mechanism as the variable resistance system. This substitution eliminates wear-related performance degradation while maintaining system simplicity, as the magnetic field strength can be increased for emergency stopping without consuming a physical pad.
4Reliability
If magnetic resistance systems are used, then brake pad wear is eliminated, but the systems have limited fine-tuning capability and abrupt resistance changes
Solution Approach 1:
The patent segments the magnetic resistance into multiple individual magnets arranged in series, allowing incremental adjustment of resistance by controlling which magnets are active or by adjusting their individual positions. This segmentation provides fine-tuning capability while maintaining the wear-free benefits of magnetic resistance.
Solution Approach 2:
The patent implements a dynamically adjustable magnetic resistance system where the position and activation state of multiple magnets can be independently controlled. This dynamic control enables smooth, incremental resistance changes while eliminating the abrupt transitions and wear problems of previous systems.
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 system reduces the need for frequent repairs, provides consistent and finely tunable resistance, and offers accurate measurement of energy expenditure, enhancing user experience and equipment durability.
Implementation Method 1
a resistance system that uses magnets and a magnetic field to vary resistance
Implementation Method 2
a brake that may physically engage a wheel or other component of the exercise equipment
Implementation Method 3
a strain gauge or load cell to measure energy exerted
Data Source
AI summary
An adjustable resistance system for use with an indoor cycle comprising a magnetic resistance assembly, a friction brake assembly, and a resistance adjustment assembly.