Magnetic Friction Reduction in Exercise Machine Crank Assemblies
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Solution Overview
Problem
Exercise machines experience significant wear and tear due to friction between moving parts, leading to reduced performance and shorter lifespan, particularly in high-intensity aerobic exercises where increased stress and friction result in mechanical strain.
Innovation Solution
Incorporating a friction reducing assembly with non-ferromagnetic materials and magnets that generate a secondary magnetic field, allowing for reduced friction and potential levitation of components, thereby minimizing contact and wear between moving parts, such as in the interaction between track ends and tracks, and using rotors with embedded magnets to control the magnetic force for optimal friction reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mechanical contact is used between moving parts, then structural simplicity is maintained, but friction and wear increase significantly
Solution Approach 1:
The patent replaces traditional mechanical contact between the crank arm head and foot beam with a magnetic field-based interaction. Magnets embedded in the crank arm head interact with ferromagnetic material in the foot beam to create friction reduction without direct contact, eliminating wear while maintaining structural simplicity.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the crank arm head and foot beam. This magnetic field mediates the interaction, allowing force transmission and friction reduction without direct mechanical contact, thereby reducing wear while maintaining system simplicity.
2Reliability
If magnetic fields are used to reduce friction, then wear is reduced, but energy consumption increases due to magnetic field generation
Solution Approach 1:
The patent utilizes the kinetic energy already present in the moving crank arm to generate the magnetic field effect. As the crank arm moves, the magnets naturally interact with the ferromagnetic material, converting mechanical motion into magnetic interaction without requiring additional energy input or active control systems.
Solution Approach 2:
The magnetic interaction occurs periodically as the crank arm rotates, with the magnets passing by the ferromagnetic material in the foot beam at regular intervals. This periodic action allows friction reduction to occur naturally during each rotation cycle without continuous energy consumption.
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 solution significantly reduces wear and tear on exercise machine components by minimizing friction, prolonging their lifespan and enhancing user experience by absorbing shock and stress variations, while maintaining efficient movement and performance.
Implementation Method 1
The friction reducing assembly includes a non-ferromagnetic material and a magnet that moves relative to the non-ferromagnetic material as the movable element moves. The relative movement of the non-ferromagnetic material and the magnet generate a force that reduces friction between the non-ferromagnetic material and the magnet during operation of the apparatus.
Implementation Method 2
The non-ferromagnetic material may create a secondary magnetic field when the magnet moves relative to the non-ferromagnetic material.
Implementation Method 3
The exercise machine may further include a rotor that holds the magnet.
Data Source
AI summary
An exercise machine includes a frame and a movable element movably attached to the frame that is movable in a performance of an exercise. The exercise machine also includes a friction reducing assembly with a first part attached to the movable element and a second part attached elsewhere on the exercise machine. The friction reducing assembly includes a non-ferromagnetic material and a magnet that moves relative to the non-ferromagnetic material as the movable element moves. The relative movement of the non-ferromagnetic material and the magnet generate a force that reduces friction between the non-ferromagnetic material and the magnet.