Axially Decoupled Crank Arm Torque Redistribution
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Solution Overview
Problem
Conventional crank arm assemblies in cycling technology face limitations in torque distribution consistency, leading to inefficiencies and increased fatigue, especially during varying terrain and riding conditions, as they fail to accommodate individual cycling techniques and biomechanics effectively.
Innovation Solution
A crank assembly system with partial decoupling of rotational motion between the crank arm and spindle, utilizing helical fluting and compression springs to redistribute torque throughout the pedal stroke, allowing for customizable decoupling and adaptability to different riding styles and conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional crank arm assemblies are used, then the structure is simple and reliable, but torque distribution is inconsistent leading to increased fatigue and reduced efficiency
Solution Approach 1:
The crank arm assembly is divided into separate functional components: a spindle, a crank arm with cylindrical bore, and a decoupling mechanism with helical flutes. This segmentation allows each component to perform its specific function while collectively improving torque distribution and reducing fatigue, thereby resolving the contradiction between enhanced productivity and device complexity.
Solution Approach 2:
The invention introduces a dynamic decoupling mechanism that allows relative rotational motion between the crank arm and spindle through helical flutes. This dynamic adjustment enables the system to adapt torque distribution in real-time during the pedal stroke, improving pedaling efficiency without requiring a completely complex static structure.
2Adaptability or versatility
If conventional fixed crank arm assemblies are used, then the device is simple to manufacture, but it cannot accommodate individual cycling techniques and biomechanics
Solution Approach 1:
The decoupling mechanism with helical flutes provides dynamic adaptability, allowing the crank arm assembly to adjust to different cycling techniques and biomechanics. The relative rotational motion enabled by the helical flutes accommodates variations in pedaling style without requiring multiple custom-designed components, balancing adaptability with manufacturing simplicity.
Solution Approach 2:
The invention changes the operational parameters of the crank arm assembly by introducing controlled relative motion between components. This parameter change allows the system to adapt to different cycling conditions and individual techniques while maintaining a standardized manufacturing process for the core components.
3Force
If conventional crank arm assemblies are used, then the structure is straightforward, but torque requirements are high at critical points causing fatigue
Solution Approach 1:
The decoupling mechanism introduces dynamic motion between the crank arm and spindle, allowing the system to redistribute torque more evenly throughout the pedal stroke. This dynamic torque distribution reduces peak forces at critical points, decreasing fatigue without requiring a fundamentally complex mechanical structure.
Solution Approach 2:
The helical flutes act as an intermediary mechanism between the crank arm and spindle, mediating the torque transmission. This intermediary allows for smooth torque distribution and reduces shock loads, improving force characteristics while adding only moderate complexity to the overall mechanism.
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
This design enhances pedaling efficiency and comfort by reducing torque requirements at critical points, improving power transfer, and allowing cyclists to tailor the system to their preferences, leading to increased performance and reduced fatigue across diverse terrains.
Implementation Method 1
The helical fluting of the spindle, the ring, and the arm enables partial decoupling of rotational motion between the arm and the spindle, such that less torque is required at the beginning and end of a pedal stroke
Implementation Method 2
A plurality of compression springs positioned around the ring and spindle fluting, wherein the plurality of compression springs counter lateral movement of the ring, providing resistance during pedaling and converting kinetic energy to potential energy during a portion of a pedal stroke and from potential energy to kinetic energy in a later portion of the pedal stroke
Data Source
AI summary
The invention discloses an Axially Decoupled Crank Arm (ADCA) that revolutionizes cycling ergonomics by redistributing torque requirements throughout the pedal stroke. This innovative crank assembly system comprises a spindle, an arm, and a tube geometry component with helical fluting, enabling partial decoupling of rotational motion. As the cyclist pedals, the arm rotation causes lateral movement of the tube geometry component, reducing torque demands at the pedal's top and bottom positions. Compression springs counter lateral movement, providing resistance and converting kinetic energy to potential energy. The ADCA offers customizable decoupling levels, compatibility with various bottom bracket configurations, and the ability to accommodate different pedal styles. Additionally, a locking mechanism allows cyclists to switch between decoupled and coupled modes for versatile riding experiences. With its transformative design, the ADCA enhances cycling performance, enabling smoother transitions and improved efficiency for riders across diverse terrains