Exercise Bike Rotor Assembly Vibration Reduction
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Solution Overview
Problem
Existing exercise bikes lack rigid construction, smooth user effort, and synchronized component operation, leading to an unsatisfactory user experience due to inconsistent resistance and vibration.
Innovation Solution
The exercise bike features a robust frame with a rotor assembly comprising heavy-duty blades connected to a hub, a pulley assembly, and an arm assembly, which provides a stable and consistent pedaling experience through a balanced weight distribution and enhanced moment of inertia, along with a concave pulley surface design to maintain belt tension and reduce slippage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If existing exercise bikes use standard construction, then manufacturing cost is reduced, but rigidity and durability are insufficient leading to unsatisfactory user feel
Solution Approach 1:
The exercise bike is divided into modular components including a frame assembly, rotor assembly, and drive assembly. Each module can be manufactured separately with optimized rigidity characteristics and then assembled, allowing high-strength construction without proportionally increasing overall manufacturing complexity.
Solution Approach 2:
The patent employs composite construction techniques where metal components (providing strength and rigidity) are combined with polymer components (providing damping and comfort). This composite approach achieves superior rigidity and durability while managing manufacturing complexity through standardized composite joining methods.
2Stability of the object's composition
If existing exercise bikes use lightweight components, then portability is improved, but moment of inertia is insufficient leading to inconsistent resistance and vibration
Solution Approach 1:
The rotor assembly incorporates strategically placed weight distribution where higher density material is concentrated at the periphery of the rotor to maximize moment of inertia. This local quality enhancement provides consistent resistance and reduces vibration without requiring the entire bike to be heavy.
Solution Approach 2:
The design incorporates counterbalancing elements in the rotor assembly that offset unwanted vibrations and inconsistencies in resistance. These counterweights are integrated into the rotor structure to provide stability without adding excessive overall weight to the movable components.
3Loss of energy
If existing exercise bikes use simple pulley design, then manufacturing is easier, but belt slippage occurs reducing energy efficiency
Solution Approach 1:
The pulley assembly incorporates a concave curved surface instead of a flat or convex surface. This concave curvature creates a self-centering effect that maintains optimal belt contact and tension, preventing slippage and improving energy efficiency. The curved geometry is achieved through standard molding or machining processes.
Solution Approach 2:
The pulley acts as an intermediary element between the drive belt and the rotor assembly. The specially designed pulley surface geometry mediates the power transmission by maintaining consistent belt engagement, reducing slippage losses while the pulley itself remains a relatively simple manufactured component.
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 results in a more rigid and durable exercise bike with reduced vibration and noise, offering a smoother, consistent pedaling experience and improved user feedback, enhancing overall performance and user satisfaction.
Implementation Method 1
a pulley assembly and an arm assembly operably connected to the pulley assembly to drive rotation of the rotor through the pulley assembly
Implementation Method 2
a concave pulley surface design to maintain belt tension and reduce slippage
Data Source
AI summary
An exercise bike includes a frame, a rotor assembly and a drive assembly mounted on the frame, where the drive assembly is configured to drive rotation of the rotor assembly, and a cover configured to at least partially cover the rotor assembly. The components of the drive assembly and the rotor assembly include structures that improve the performance of the exercise bike, including but not limited to a strong and rigid construction and improvements in belt tracking, user feel, effort consistency, synchronization, and rotor performance.