Shaft Slip-Off Stopping Structure With Elastic Locking Pieces
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Solution Overview
Problem
Conventional shaft slip-off stopping structures suffer from insufficient strength, ease of slipping off due to bifurcation or division of components, and increased component complexity, which complicates manufacturing and increases costs.
Innovation Solution
A shaft slip-off stopping structure featuring a locking mechanism with annular grooves and ring-shaped projections, supported by elastic locking pieces arranged around the shaft, which engage the shaft tip to prevent slipping, allowing for minimal components and robust assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shaft is bifurcated to allow passage through a hole, then the shaft can be inserted and elastically returned, but the overall shaft strength becomes insufficient and it may easily slip off
Solution Approach 1:
The shaft tip is segmented into multiple locking pieces arranged around the shaft at equal intervals. Each locking piece includes a base part extending along the shaft length direction and a tip locking portion bending from the base part. This segmentation allows the shaft to be inserted elastically while maintaining overall strength through the distributed locking structure.
Solution Approach 2:
The locking pieces are nested within the shaft structure, with the tip locking portions abutting on the locking step portion formed by the annular groove or ring-shaped projection. This nesting allows the locking mechanism to be integrated into the shaft without adding external components, maintaining strength while enabling elastic return.
2Reliability
If a clip projects in the transverse direction to stop the shaft, then the shaft can be prevented from slipping off, but the number of components increases
Solution Approach 1:
The locking function is merged into the shaft structure itself through the locking pieces that are part of the shaft inserted member. The tip locking portions of these pieces directly abut on the locking step portion to prevent slip-off, eliminating the need for separate external clips or stopping members.
Solution Approach 2:
The locking pieces serve multiple functions: they provide the locking action to prevent slip-off, maintain elastic return capability during insertion, and are integrated into the shaft structure. This multi-functionality reduces the need for additional specialized components.
3Strength
If the locking mechanism uses multiple locking pieces arranged around the shaft, then the shaft strength is sufficient and slip-off is prevented, but the structure becomes more complex
Solution Approach 1:
The locking pieces are arranged asymmetrically around the shaft at equal intervals, with each piece having a specific orientation where the tip locking portion abuts on the locking step portion. This asymmetric arrangement provides sufficient strength through distributed locking while maintaining a relatively simple structure compared to symmetric multi-component systems.
Solution Approach 2:
Instead of using external clips projecting from the shaft, the locking pieces are integrated into the shaft structure with their tip locking portions bending from the base part. This inverted approach simplifies the overall structure while maintaining the necessary locking function.
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 provides a robust, low-component-count shaft slip-off stopping structure that is difficult to pull out, ensuring sufficient strength and reducing manufacturing complexity and costs by eliminating the need for additional stopping members like E-rings.
Implementation Method 1
Each of the extension parts, being pushed against the abutting end part, is deformed to allow for passage of the abutting end part, and is elastically returned after the passage so as to be engaged when the abutting end part is pulled up.
Data Source
AI summary
Disclosed is a shaft inserted member into which a shaft is inserted in a relatively movable manner, and a locking mechanism provided in the shaft inserted member. The tip portion of the shaft includes a locking step portion formed by providing an annular groove or a ring-shaped projection portion. The locking mechanism includes at least two locking pieces arranged around the shaft at an equal interval. The shaft is stopped from slipping off by a tip portion of each of the tip locking portions abutting on the locking step portion. The locking piece can receive the force in a pulling direction in a length direction of the locking piece, whereby a load can be reduced. That is, sufficient strength can be maintained.