Multi-Speed Gear Hub Through-Bolt Rigidity
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Solution Overview
Problem
Current internally geared hubs for bicycles and other pedally or manually propelled vehicles lack robustness, number of speeds, gear width, lateral rigidity, ease of operation, and manufacturing costs, making them unsuitable for high-performance use in rough terrain.
Innovation Solution
A multispeed internally geared hub with a massive vertical shear force load carrying quick release through-bolt and redesigned epicyclical mechanisms, featuring a compact, lightweight design with a wide gear range and user-friendly attachment system, incorporating a rotatable shift axle with cams to operate shift rings and dog clutches for multiple gear ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional quick release system with a non load-bearing Ø5mm through-bolt is used, then ease of operation is improved, but lateral rigidity deteriorates
Solution Approach 1:
The invention merges the quick release function with the load-bearing function by integrating a shear force load carrying through-bolt into the quick release system. The through-bolt is positioned to carry both lateral loads and vertical shear forces, combining previously separate functions into a single integrated component that maintains ease of operation while providing the needed rigidity.
2Strength
If a shear force load carrying through-bolt is used to improve lateral rigidity, then lateral rigidity is improved, but device complexity increases
Solution Approach 1:
The through-bolt is designed as a universal component that performs multiple functions simultaneously: it carries lateral loads, carries vertical shear forces, and provides the quick release attachment function. This multi-functionality eliminates the need for separate components for each function, thereby reducing overall device complexity despite the advanced requirements of the single through-bolt.
3Strength
If the hub is secured to the frame with powerful nuts, then lateral rigidity is improved, but ease of operation deteriorates
Solution Approach 1:
The invention introduces dynamic functionality to the attachment system by enabling quick release and reattachment of the hub without requiring tools or specialized skills. The through-bolt system allows the hub to be rapidly secured or released by simply operating the quick release mechanism, transforming a static, tool-dependent attachment system into a dynamic, user-friendly system that maintains rigidity during operation.
Data Source
AI summary
A robust and reliable multi-speed gear system for use on pedally or other manually propelled vehicles, comprising simple epicyclical sections 82, 83, 23 in a complex structure, an internal axial tunnel enabling use of a detachable, vertical shear force load carrying through-bolt 15, a rotatable shift axle 25, a main shaft 7 non-rotatably mounted to the vehicle frame 10, axially floating shift mechanisms 20, 22, 65, and a hub shell 1 fully enclosing the gear mechanisms. The multispeed hub is robust, light, easily manufactured, offers many speeds and great gear width, and is rigidly securable to the vehicle frame.