Human-Powered Vehicle Drive Unit With Speed Increaser
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Solution Overview
Problem
Existing drive units for human-powered vehicles do not efficiently transmit human driving force, leading to suboptimal performance and increased load on the rider.
Innovation Solution
A drive unit comprising a speed increaser, a transmission device with multiple stages, and a speed reducer, configured to receive and transmit human driving force in a preferred manner, with the speed reducer positioned downstream to reduce rider load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a speed increaser is added to reduce torque before the transmission device, then the transmission device can perform shifting in a preferred manner, but the device complexity increases
Solution Approach 1:
The transmission system is divided into distinct functional modules: a speed increaser positioned between the rider and the transmission device. This segmentation allows the speed increaser to specifically address shifting performance by reducing torque to preferred levels, while the transmission device can operate independently with optimized shifting characteristics, thereby resolving the contradiction between improved shifting and increased complexity through functional modularity
Solution Approach 2:
A speed increaser is introduced as an intermediary component between the rider's input and the transmission device. This mediator reduces the torque from the rider to a preferred level before it reaches the transmission device, enabling smooth shifting operation. The intermediary absorbs the complexity of torque management, allowing the transmission device to focus on shifting functionality
2Force
If a speed reducer is positioned downstream of the transmission device, then the load on the rider is reduced, but the transmission path length increases
Solution Approach 1:
The transmission system is segmented with the speed reducer positioned downstream of the transmission device, creating distinct functional zones. The transmission device handles shifting and torque modulation, while the downstream speed reducer specifically addresses load reduction on the rider. This segmentation allows optimal performance of each component while managing the overall transmission path length through structured arrangement
Solution Approach 2:
The speed reducer is positioned in the downstream direction, utilizing the longitudinal dimension of the transmission path to place load-reducing functionality after the transmission device. This spatial arrangement in another dimension (downstream position) allows the system to reduce rider load while maintaining a compact overall structure, effectively managing the transmission path length through strategic dimensional placement
3Adaptability or versatility
If multiple transmission stages are used in the transmission device, then the shifting performance is improved, but the device complexity increases
Solution Approach 1:
The transmission device incorporates multiple transmission stages as segmented functional units within the transmission path. Each stage provides specific gear ratios and shifting characteristics, collectively delivering enhanced shifting performance and adaptability. The segmentation of transmission stages allows complex shifting capabilities to be achieved through modular, manageable components rather than a monolithic complex system
Solution Approach 2:
The transmission device with multiple stages serves multiple functions: torque modulation, speed variation, and adaptive shifting across different riding conditions. Each transmission stage contributes to universal adaptability, allowing the single transmission device to handle various load conditions, speeds, and rider preferences, thereby achieving high versatility without proportionally increasing complexity through functional integration
Data Source
AI summary
A drive unit is for a human-powered vehicle provided on an axle of a wheel of the human-powered vehicle. The drive unit includes a speed increaser, a transmission device and a speed reducer. The speed increaser is configured to receive a human driving force. The transmission device includes a plurality of transmission stages. The transmission device is configured to receive the human driving force via the speed increaser. The speed reducer is configured to receive the human driving force via the transmission device.