Sabot-Projectile Coupling for Torque Transfer
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Solution Overview
Problem
Existing sabot-projectile assemblies often experience rotational slippage and separation issues due to high rotational inertial forces, leading to suboptimal spinning and separation problems when accelerated down a rifled barrel.
Innovation Solution
A sabot-projectile system with a geometrically mating rearward end and inside bottom surface, featuring a hollowed sabot pocket and longitudinal slots, ensures positive engagement and zero slip during acceleration, allowing for efficient torque transmission and easy separation post-exit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If small splines or plastic protrusions are used to engage between sabot and projectile, then some rotational coupling is achieved, but they cannot withstand high rotational inertial forces and still experience slippage
Solution Approach 1:
The patent changes the geometric parameters of the engagement interface by transitioning from small splines/protrusions to a slot-cross configuration. The slot in the sabot rear surface and cross-shaped protrusion on the projectile base create a more robust mechanical interlock that can withstand high rotational inertial forces without slippage.
2Strength
If small splines or plastic protrusions are used for engagement, then coupling is provided, but they impede separation of sabot and projectile or are designed not to separate
Solution Approach 1:
The patent creates a dynamic engagement system where the slot-cross geometry provides strong coupling during acceleration but allows easy separation after barrel exit. The longitudinal slots in the sabot rear surface enable the cross-shaped protrusion to pass through freely during separation, transforming the static strong-engagement geometry into a dynamic system that facilitates post-firing separation.
3Ease of manufacture
If smooth mating surfaces are used between sabot and projectile, then manufacturing is simplified, but significant rotational slippage occurs during acceleration
Solution Approach 1:
The patent introduces asymmetric geometric features (slot and cross-shaped protrusion) into the previously smooth mating surfaces. The cross-shaped protrusion has four arms extending from a central point, creating an asymmetric pattern that mechanically interlocks with the slot to prevent rotational slippage while maintaining manufacturing feasibility through standard molding or machining operations.
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
This design enhances projectile stability and accuracy by preventing rotational slippage and ensuring seamless separation, maintaining speed and accuracy post-barrel exit.
Implementation Method 1
the sabot geometric shape is hollowed to allow the pressure from the exploding propellant to enhance the engagement between the sabot and projectile
Implementation Method 2
The sabot also engages in the rifling of the barrel and imparts a rotational force to the projectile
Data Source
AI summary
A self-separating sabot-projectile assembly with a positive engaging attachment to eliminate rotational slippage between the sabot and projectile. The torque transmitting interface between the sabot and projectile consists of a geometric shaped depression in the rearward end surface of the projectile which mates with a matched projection of the sabot. The sabot projection is hollowed out to allow the charge pressure to aid in the engagement of the sabot and projectile.