Transmission Vent End-Piece with Staggered Snap-Fit Tabs
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Solution Overview
Problem
The existing snap-fitting end-pieces for ventilation members in transmission casings require significant force for press-fitting, which can lead to deformation and unreliable fastening due to the high stress on the tabs and end-piece.
Innovation Solution
The end-piece features a hollow tubular body with longitudinally extending slots forming snap-fitting tabs, where the radial shoulders are in the same radial plane and the guide ridges are axially shifted, distributing the snap-fitting force to reduce the total force required for fastening and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple snap-fitting tabs are used to ensure reliable fastening, then the reliability of connection is improved, but the total force required for press-fitting increases and may cause deformation
Solution Approach 1:
The end-piece is segmented into multiple tabs (at least two tabs) that are spatially separated and independently engage with the outer member. Each tab has its own snap-fitting leg and guide ridge, distributing the connection function across multiple independent elements rather than relying on a single high-force connection point.
Solution Approach 2:
The tabs are arranged in different radial planes (at least two different radial planes around the main axis), adding a spatial/dimensional distribution to the force application. This spatial arrangement allows the press-fitting operation to proceed with lower instantaneous force at any given location, while still achieving reliable multi-point fastening.
2Strength
If significant press-fitting force is applied to ensure solid fastening, then the strength of connection is improved, but the end-piece may undergo plastic and irreversible deformation
Solution Approach 1:
The fastening function is divided into multiple tabs, each contributing partially to the overall fastening strength. This segmentation allows the total fastening strength to be achieved through cumulative effect of multiple lower-force connections rather than a single high-force connection that would deform the end-piece.
Solution Approach 2:
Each tab is designed with specific local features (guide ridge with top, snap-fitting leg, radial shoulder) that optimize the local engagement with the outer member. The guide ridge with its top creates a controlled engagement point that distributes the local stress and prevents concentration of force that would cause deformation.
3Ease of operation
If multiple tabs with guide ridges are used to facilitate press-fitting, then the ease of operation is improved, but the complexity of the end-piece structure increases
Solution Approach 1:
The end-piece structure is segmented into multiple identical or similar tab units, each with guide ridge and snap-fitting leg. This modular segmentation facilitates ease of operation through distributed engagement while the repetition of standardized elements keeps the manufacturing complexity manageable.
Solution Approach 2:
The guide ridges with tops are designed to engage with the outer member in a predetermined sequence or pattern during press-fitting. This preliminary guidance action facilitates smooth insertion by pre-aligning the tabs with their engagement positions, reducing the operational complexity despite the multi-tab structure.
Data Source
AI summary
A end-piece having a hollow tubular body having a longitudinal main axis X and provided with a plurality of longitudinal slots extending from an open end of the end-piece and delimiting a plurality of snap-fitting tabs, each provided with a snap-fitting leg delimited axially by a radial shoulder and extending axially by a guide ridge towards said free end, the guide ridge having a top corresponding to a maximum snap-fitting force linked to the crossing of said top. At least first and second tabs defining respectively first and second tops, the tops are axially shifted relative to each other.