Linking Dome Flexible Tabs for Ammunition Skirt Assembly
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Solution Overview
Problem
Existing large caliber ammunition with combustible skirts for tank cannons face complexity in assembly and risk of detachment between the skirt and dome, requiring numerous handling operations and specific qualifications.
Innovation Solution
A design featuring a linking dome with flexible tabs and a central ring that can be bent back onto the combustible skirt, eliminating the need for mounting rivets and simplifying assembly by using an igniter held by an elastic ring and a nut, providing resistance to traction and torsion stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional rivet-based attachment means are used between the skirt and dome, then the connection strength is improved, but the assembly complexity and handling operations increase
Solution Approach 1:
The patent removes the rivet-based attachment system from the traditional skirt-dome connection. Instead of using external rivets, the invention integrates the attachment function into the dome structure itself through flexible tabs that are bent back onto the skirt, eliminating the need for separate attachment means and simplifying the assembly process.
Solution Approach 2:
The invention merges the attachment function with the dome structure by integrating flexible tabs into the dome itself. These tabs serve both as structural elements of the dome and as attachment means to connect to the skirt, combining multiple functions into a single integrated component rather than using separate rivets and attachment hardware.
2Reliability
If numerous handling operations are used for assembly, then the connection reliability is improved, but the manufacturing time and labor requirements increase
Solution Approach 1:
The flexible tabs are pre-formed and positioned on the dome during manufacturing, so that when the dome is assembled to the skirt, the attachment function is already prepared and requires no additional handling operations. The tabs are designed to be bent back onto the skirt as part of the final assembly step, eliminating the need for separate riveting operations.
3Ease of operation
If simple attachment means are used between the skirt and dome, then the assembly simplicity is improved, but the resistance to traction and torsion stresses decreases
Solution Approach 1:
The invention uses flexible tabs made of elastomeric material that can bend and deform to accommodate the assembly process. These flexible tabs provide both simplicity in assembly and sufficient strength to resist traction and torsion stresses through their elastic deformation capabilities and integration with the dome structure.
Solution Approach 2:
The dome is constructed using composite materials that combine structural integrity with flexibility. The elastomeric flexible tabs integrated into the dome provide both the simplicity of a unified structure and the strength needed to withstand operational stresses, combining different material properties to achieve multiple performance requirements simultaneously.
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
Simplifies the manufacturing process, reduces assembly complexity, and enhances the resistance of the skirt-dome-base link, eliminating the need for specific handling qualifications and ensuring secure attachment without rivets.
Implementation Method 1
the dome comprises means to ensure its joining with the skirt, such means being able to be bent back by the base onto the lateral wall of the combustible skirt
Implementation Method 2
the flexible tabs are provided with ridges enabling the dome to be immobilized on the skirt
Implementation Method 3
the igniter is held in the drill hole on one side by a system of snugs/notches and on the other by an elastic ring
Data Source
AI summary
An ammunition comprising a projectile attached to a combustible skirt and enclosed by a base, a linking dome being provided between the skirt and the base, wherein the linking dome includes a first outer wall contacting with the skirt and a second outer wall extending from the first one and contacting with the base, and wherein the dome comprises a unit to ensure its joining with the skirt, the unit being able to be bent back by the base onto an outer wall of the combustible skirt when the base is disposed over the linking dome.