Coaxial Load Wheel Crank Exercise Mechanism
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Solution Overview
Problem
Conventional exercise machines with separate axles for active and load wheels are bulky, making them unsuitable for compact spaces, and direct crank-to-load wheel connections result in low rotational speed and momentum, leading to inefficient exercise.
Innovation Solution
An exercise machine design featuring coaxial load wheels and cranks with a step-up device that includes an active wheel, a passive wheel, and transmitting elements, such as belts or chains, to synchronize rotational speeds and increase the rotational momentum of the load wheel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the active wheel and load wheel are provided on two different axles, then the exercise machine can function properly, but the machine becomes bulky and occupies too much space
Solution Approach 1:
The patent merges the active wheel and load wheel onto a single common axle, eliminating the need for separate axles. This consolidation reduces the overall footprint of the exercise machine while maintaining the functional relationship between the wheels through belt or chain transmission, directly addressing the space occupation problem.
Solution Approach 2:
The patent rearranges the spatial configuration by positioning wheels in a compact layout around a single axle, potentially utilizing vertical or radial space more efficiently. This dimensional reorganization allows the machine to maintain its functional dimensions while reducing the horizontal footprint.
2Device complexity
If the cranks are directly connected to the load wheel without an active wheel, then the structure becomes simpler, but the rotational speed and momentum of the load wheel become too low
Solution Approach 1:
The patent introduces an active wheel as an intermediary component between the cranks and load wheel. This intermediate element enables speed multiplication through differential radius transmission, allowing the load wheel to rotate faster than the cranks while maintaining structural simplicity through a single axle system.
Solution Approach 2:
The patent changes the rotational speed parameter of the load wheel by using an active wheel with a different radius than the load wheel. This parameter modification allows the system to achieve higher rotational speeds at the load wheel while keeping the overall structure simple and compact.
3Speed
If the rotational speed of the load wheel is increased to ensure smooth operation, then the exercise performance improves, but the machine requires more complex transmission mechanisms
Solution Approach 1:
The patent combines the speed multiplication function with the compact single-axle structure, achieving high rotational speed without requiring complex multi-stage transmissions. The direct belt or chain connection between the active wheel and load wheel on the same axle provides efficient speed transfer with minimal mechanical complexity.
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 coaxial design enhances the rotational speed and momentum of the load wheel, ensuring smooth operation and reducing the bulkiness of the exercise machine, making it more suitable for compact spaces while maintaining effective exercise performance.
Implementation Method 1
A step-up device includes a shaft rotationally supported on the base and small and large wheels connected to the shaft so that they are rotational synchronously. The small wheel is connected to the active wheel so that the small wheel is rotational with the active wheel. The large wheel is connected to the passive wheel so that the passive wheel is rotational with the large wheel.
Data Source
AI summary
An exercise machine includes a base, an axle rotationally supported on the base and two cranks connected to the axle. The cranks are rotational synchronously with the axle. A drive wheel unit includes an active wheel provided on the axle so that the active wheel is rotational synchronously with the cranks. A passive wheel unit includes a load wheel supported on the axle so that the load wheel is rotational relative to the axle and a passive connected to the load wheel so that the passive wheel is rotational synchronously with the load wheel. A step-up device includes a shaft rotationally supported on the base and small and large wheels connected to the shaft so that they are rotational synchronously. The small wheel is connected to the active wheel so that they are rotational together. The large wheel is connected to the passive wheel so that they are rotational together.