Four-Link Shaft Coupling for Selective Engagement
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Solution Overview
Problem
Existing systems for mechanically connecting shafts lack efficient means to connect and disconnect shafts while minimizing power loss and preventing damage, and they often require complex control mechanisms or are prone to failure.
Innovation Solution
A linkage system comprising multiple pivotally connected members that can switch between engaged and disengaged modes, utilizing a torsion spring or actuator to control the mode of operation, allowing for controlled rotation and independent rotation of input and output shafts, and including features like spacers and stops to manage pivotal connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a ratchet system is used to connect and disconnect shafts, then disconnection is enabled in a particular direction, but power loss increases and controllability decreases
Solution Approach 1:
The linkage system dynamically changes its configuration between engaged and disengaged modes through the movement of the second pivotal connection. When disengaged, the linkage allows free rotation with minimal power loss; when engaged, it provides controlled power transfer. This dynamic reconfiguration resolves the contradiction by enabling disconnection without the energy losses associated with ratchet systems.
Solution Approach 2:
The system changes the geometric parameters of the linkage configuration to switch between modes. By moving the second pivotal connection between collinear and non-collinear positions relative to the shafts, the system alters its mechanical properties to enable either free rotation or controlled power transfer, thereby reducing power loss while maintaining operational flexibility.
2Ease of operation
If a controllable system is used to connect and disconnect shafts, then controllability improves, but device complexity increases
Solution Approach 1:
The linkage system is self-controlling through its mechanical geometry. The position of the second pivotal connection automatically determines whether the system is in engaged or disengaged mode, eliminating the need for complex external control mechanisms. The system serves itself by using its own configuration to control the connection state, thereby improving controllability without increasing complexity.
Solution Approach 2:
The same linkage structure performs multiple functions: it transmits power when engaged and allows free rotation when disengaged. The four-member linkage with its specific pivotal connections serves both as a power transmission mechanism and a control mechanism, reducing overall system complexity while maintaining full controllability.
3Loss of energy
If the linkage is in engaged mode for power transfer, then power transfer efficiency improves, but shaft independence decreases
Solution Approach 1:
The linkage dynamically switches between engaged and disengaged states, allowing the shafts to be coupled for efficient power transfer when needed and uncoupled for independent rotation when needed. The ability to change state maintains both power transfer efficiency and shaft independence at different times, resolving the contradiction through temporal separation of functions.
Solution Approach 2:
The system alternates between engaged and disengaged modes periodically or as needed, enabling power transfer during engaged periods and independent shaft operation during disengaged periods. This periodic switching allows the system to achieve both efficient power transfer and shaft independence through time-based separation of operational modes.
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
Enables efficient power transfer with minimal loss by automatically switching between engaged and disengaged modes, allowing for controlled rotation and independent shaft operation, thus enhancing the reliability and efficiency of shaft connections.
Implementation Method 1
the device includes a torsion spring that is configured to be tensioned by rotation of the first member while the linkage system is in the disengaged mode, the tension increasing until the torsion spring causes the linkage system to move to the engaged mode, the tension in the torsion spring being released when the linkage system is in the engaged mode
Data Source
AI summary
A linkage system is disclosed that is suitable for connecting an input shaft and an output shaft. The linkage system has a wide variety of applications, with non-limiting examples disclosed including a hinge for a door or gate, and a hub for a bicycle or similar. The linkage system comprises a first member having an input location fixedly connected to the input shaft, a second member having an input location pivotally connected to an output location of the first member, a third member having an input location pivotally connected to an output location of the second member, and a fourth member having an input location pivotally connected to an output location of the third member and having an output location fixedly connected to the output shaft. The linkage system has an engaged mode of operation whereby rotation of the input shaft causes corresponding rotation of the output shaft, and a disengaged mode of operation whereby the input shaft can be rotated independently of the output shaft.