Internal Clutch Control Assembly Using Cam-Driven Displacement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing internal clutch mechanisms in bicycles are complex, heavy, expensive, and insensitive, leading to suboptimal gear changing performance, with a need for simpler, lighter, and more cost-effective solutions that enhance sensitivity and precision in gear shifting.
Innovation Solution
A control assembly for an internal clutch utilizing rotary dynamic components, including input rings, inner gears, and cam-like mechanisms to control the engagement and disengagement of sun gears and planet gears, featuring axial and radial clutching units with guide recesses, sliding seats, and ratchet rings to facilitate efficient gear changes through cam-driven displacements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional control mechanisms are used for internal clutch, then the structure is complex and heavy, but the sensitivity and precision in controlling gear changes deteriorates
Solution Approach 1:
The control assembly is divided into multiple independent control units (first control unit for sun gear, second control unit for inner gears and planet frame, third control unit for coordinated control). Each control unit operates independently to control specific components, simplifying the overall structure while maintaining precise control over each gear element.
Solution Approach 2:
A cam mechanism serves as an intermediary component that translates rotational motion from the driving rod into precise linear displacement of the control units. This cam-mediated control enables sensitive and accurate gear changing by converting simple rotational input into complex multi-directional control movements.
2Device complexity
If traditional control mechanisms are used for internal clutch, then the structure is complex, but the assembly and repair efficiency deteriorates
Solution Approach 1:
The control assembly consists of modular control units that can be independently assembled and disassembled. Each control unit can be serviced separately, greatly improving repair efficiency and reducing the need for complete disassembly of the clutch mechanism.
Solution Approach 2:
The control units are designed with universal interfaces and standardized components (such as the cam mechanism, driving rods, and control elements) that can be interchanged across different gear positions, simplifying both assembly and repair procedures.
3Device complexity
If cam or cam-like components are used to drive driven device to rotate or displace for controlling clutch, then the structure becomes simple and light, but the cost may increase
Solution Approach 1:
The cam mechanism utilizes the existing rotational motion from the bicycle's drivetrain components (input ring, planet frame, or output ring) to automatically drive the control units without requiring additional power sources or complex actuation systems. The system serves itself by converting available mechanical energy into precise control movements.
4Device complexity
If traditional control mechanisms are used for internal clutch, then the structure is complex, but the gear changing speed deteriorates
Solution Approach 1:
The cam mechanism acts as a mechanical intermediary that directly translates rotational input into rapid linear displacement of control elements, enabling fast gear changing. The cam profile is specifically designed to provide quick, decisive movement through the neutral position, minimizing transition time between gear states.
Solution Approach 2:
The gear changing mechanism utilizes periodic rotational motion from the drivetrain to cyclically actuate the control units. Each rotation provides a periodic opportunity for gear shifting, and the cam mechanism is designed to maximize the effectiveness of each periodic cycle, enabling rapid repeated gear changes.
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 solution results in a lighter, more cost-effective, and sensitive gear shifting system that saves storage space, improves assembly and repair efficiency, and enables faster gear changes, addressing the limitations of prior art by simplifying the structure and enhancing operational precision.
Implementation Method 1
using a cam or cam-like components to drive a driven device to rotate or displace so as to control the clutch to change gears
Implementation Method 2
a left sliding block returning spring and a left actuating sliding block which is resisted by the sliding block returning spring
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A control assembly of an internal clutch comprises a first control unit (A) for controlling the fixedness of a sun gear; a second control unit (B) for controlling engagements of inner gears at two sides and a planet frame; a third control unit (C) for controlling the sun gear or the inner gears and the planet frame; and wherein power for control units (A,B,C) are from rotary dynamic components, by displacements of driving rods for controlling operations of a cam (24) or cam-like component; by using the cam or cam-like unit to function clutch or by using the cam or cam-like unit to drive a driven device to rotate or displace for operation of the clutch. By power rotating components of the internal clutch and cam (24) or cam-like component, clutching components are controlled.