Freewheel Adjustable Wheel for Exercise Bikes
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Solution Overview
Problem
Existing exercise bikes with freewheel and non-freewheel modes require manual switching, which is inconvenient and can lead to increased wear on parts, reducing durability and operation reliability.
Innovation Solution
A freewheel adjustable wheel system that automatically switches between freewheel and non-freewheel modes using a motor-driven moveable gear assembly, expanding the engagement area size of gears to reduce stress and improve durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual switching between freewheel and non-freewheel modes is implemented, then the device can change operational modes, but user convenience deteriorates due to the need for manual intervention during exercise
Solution Approach 1:
The system automatically detects pedal rotation direction and switches between freewheel and non-freewheel modes without user intervention. The sensor detects reverse rotation and triggers the switching mechanism automatically, making the system serve itself rather than requiring manual operation.
Solution Approach 2:
The manual mechanical switching mechanism is replaced with an automated system using sensors and actuators. The sensor detects pedal rotation direction and activates the switching mechanism automatically, replacing the need for manual mechanical operation.
2Device complexity
If manual switching mechanism is used, then the device structure can be simple, but operation reliability deteriorates due to increased wear on switching parts
Solution Approach 1:
The system automatically switches modes based on detected pedal rotation direction, eliminating repeated manual switching operations that cause wear. The automatic detection and switching reduces the frequency and intensity of mechanical engagement, thereby reducing wear on switching parts.
3Reliability
If gear engagement area is expanded, then durability improves by reducing stress concentration, but device complexity increases
Solution Approach 1:
The gear is designed with a ring-shaped structure that engages with the clutch hub, effectively increasing the engagement area from a single-point or single-line contact to a distributed circular contact zone. This dimensional expansion of the engagement area distributes stress more evenly across the gear interface.
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 enhances user convenience by automating mode switching, reduces part wear and maintenance costs, and improves operation reliability by directly transmitting power to the moveable gear assembly.
Implementation Method 1
a driver (270) that is fixed to the casing (230) and supplies rotational power
Implementation Method 2
a clutch bearing (240) installed between the rotary gear (210) and the casing (230), wherein the clutch bearing (240) transmits power to the casing (230) when the rotary gear (210) rotates in a forward direction
Implementation Method 3
a moveable gear assembly (280) that moves by power of the driver (270)
Data Source
AI summary
A freewheel adjustable wheel of the present invention comprises: a rotary gear unit that is rotated by receiving power from a pedal part and is provided with a gear along the outer circumference thereof; a case part that supports the rotary gear unit to be rotatable; a clutch bearing that transmits the power to the case part when the rotary gear unit rotates in the forward direction; a clutch hub that rotates together with the rotary gear unit; clutch gears installed on the clutch hub and fixed to the case part; and a drive unit that supplies rotational power; and a moveable gear unit moved by means of the power of the driving unit.