Shaft Locking Mechanism for Tubular Device Retention
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Solution Overview
Problem
Existing shafts for rotationally coupling main devices to tubular devices face issues with securing the tubular device against unintentional removal during operation, particularly when subjected to impacts, leading to potential detachment.
Innovation Solution
A shaft design with a blocking device and locking mechanism that allows for secure axial retention of the tubular device, enabling easy mounting and removal, featuring a radially protruding retaining section and an elastic locking mechanism that transitions between locked and unlocked states through axial or rotational movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple securing device is used to retain the tubular device on the shaft, then the mounting and removal process remains simple and rapid, but the axial retaining force is restricted to ergonomic limits and the tool may jump off during impact
Solution Approach 1:
The securing device employs a dynamic locking mechanism with a blocking device that can transition between locked and unlocked states. The blocking device includes a blocking element that can engage with a blocking recess to prevent tool removal, while also allowing rapid transition to an unlocked state for easy removal when needed.
Solution Approach 2:
The securing device is divided into functional segments: a blocking device with a blocking element, a locking device with a locking element, and a spring element. Each segment performs a specific function - the blocking element prevents removal, the locking element controls the blocking element's position, and the spring element provides the necessary force for engagement and disengagement.
2Reliability
If a locking mechanism is added to prevent tool removal during impact, then tool retention reliability improves, but the mounting and removal operation becomes more complex
Solution Approach 1:
The locking mechanism is designed to automatically engage and lock when the tool is mounted on the shaft. The blocking element automatically engages with the blocking recess upon insertion, providing self-locking functionality without requiring additional manual operations during mounting.
Solution Approach 2:
The locking mechanism allows for periodic transition between locked and unlocked states. The operator can rapidly switch between these states by applying force to the locking element, enabling quick tool changes while maintaining secure retention during operation.
3Volume of moving object
If the blocking device is integrated into the securing device, then the overall structure remains compact, but the securing device must accommodate additional components for locking and blocking functions
Solution Approach 1:
The blocking device and locking device are integrated into a single securing device assembly. The blocking element and locking element work together in a coordinated manner, with the locking element controlling the position of the blocking element. This integration allows both blocking and locking functions to be achieved within a compact volume.
Solution Approach 2:
The securing device serves multiple functions: it provides axial retention of the tool, prevents unintentional removal through the blocking mechanism, and allows rapid removal when unlocked. The spring element provides both the force for engagement and the mechanism for rapid disengagement, demonstrating multi-functionality within a single component.
Data Source
AI summary
A shaft for rotationally coupling a main device to a tubular device includes a first free end that is configured to be introduced into the tubular device, and a second end configured to be secured to the main device. The shaft also defines at least a first bearing region along an outer circumference that is configured to form a contact in a hollow accommodating region of the tubular device, and further includes at least one torque-transmitting section configured to engage with a torque-transmitting section of the tubular device. A securing device of the shaft includes a locking device that, in a locked state, is configured to prevent the securing device from being dismounted, and that, in an unlocked state, is configured to enable the tubular device to be dismounted. The securing device further includes an interlocking device that is arranged on the first end of the shaft, and that enables locking and unlocking the locking device.