Shaft Coupling Locking Pin for Tool-Free Manual Release
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Solution Overview
Problem
Existing connection devices for shafts in transmission assemblies are difficult to unlock without tools, especially when components jam, requiring disassembly of multiple parts or cutting of shafts to access the locking mechanism.
Innovation Solution
A connection device with a blocking pin that can be manually unlocked using an actuating part, featuring an elastic return member to maintain the locked position and a slider for easy transition between locked and unlocked states, allowing tool-free locking and unlocking regardless of shaft position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a threaded orifice with locking screw is used to secure the shaft end, then the connection is reliably locked, but the unlocking requires tools and is difficult when components are jammed
Solution Approach 1:
The connection device enables self-service operation by allowing the operator to unlock the blocking pin manually without requiring external tools. The actuating part with slider provides a self-contained mechanism where the operator can directly manipulate the blocking pin between locked and unlocked positions, making the system self-sufficient for maintenance operations.
Solution Approach 2:
The blocking pin transitions from a static locked position to a dynamic unlocked position through the actuating mechanism. The slider enables the blocking pin to move dynamically between positions, transforming the rigid locking system into a flexible one that can be easily activated and deactivated by manual operation.
2Ease of operation
If a blocking pin with actuating part and slider is used, then tool-free unlocking is enabled, but the device structure becomes more complex
Solution Approach 1:
The connection device is segmented into distinct functional components: the blocking pin for locking, the slider for actuation, the spring for return force, and the actuating part for manual operation. This segmentation allows each component to perform its specific function independently, simplifying the overall design while enabling tool-free operation.
Solution Approach 2:
The slider acts as an intermediary element between the operator's manual input and the blocking pin. Instead of directly manipulating the blocking pin, the operator moves the slider, which in turn moves the blocking pin. This intermediary mechanism simplifies the user interface while maintaining reliable locking functionality.
3Reliability
If extensive disassembly is required to access the locking mechanism, then the shafts are securely protected, but maintenance time and complexity increase significantly
Solution Approach 1:
The blocking pin and its actuating mechanism are extracted to be accessible from the exterior of the connection device. The actuating part extends outward, allowing the operator to access and manipulate the locking mechanism without needing to disassemble the connection device or remove other components. This extraction principle enables quick maintenance while maintaining shaft protection during operation.
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 easy and tool-free locking and unlocking of shafts, facilitating maintenance and disassembly without the need for extensive disassembly or cutting, improving accessibility and reducing complexity.
Implementation Method 1
an elastic return member (4) adapted to urge the blocking pin (3) toward the locked position
Data Source
AI summary
A device (1) for connecting an end of a first shaft to an end of a second shaft, the end of the first shaft having a radial groove. The device includes a body (2) having a bore (21) into which the end of the first shaft can be introduced, a locking pin (3) movable with respect to the body (2) between a locked position, in which the pin (3) projects into the bore (21) such that, when the end of the first shaft is received inside the bore (21), the locking pin (3) is engaged in the radial groove in the end of the first shaft, and an unlocked position. In the unlocked position, the locking pin (3) is disengaged from the radial groove in the end of the first shaft, and an elastic return member (4) urges the locking pin (3) into the locked position.