Research and analysis of impact load on cam transmission system of external energy firearms

DOI:	10.11809/bqzbgcxb2024.06.016
Keywords:	external energy firearm; cam mechanism; dynamics simulation; impulse; drive system
Abstract:	In order to reduce the impact load of external energy firearms transmission system, a cam type external energy firearms transmission system was used. Four cam motion patterns were selected for cam design and an external energy firearm extraction resistance curve was determined. The influence of these four cams on the automatic motion characteristics of firearm was simulated and studied through dynamic simulation analysis methods. The impulse during the movement of the bolt carrier was chosen as the target, then the impulse size during recoil and counter recoil processes of external firearm under different cams were analyzed respectively. Comparing the influence of different cam profile curves on firearms, the results showed that when the cam profile curve of external energy firearms adopts a modified trapezoidal motion law during recoil process and a simple harmonic motion law during counter recoil process, the automatic action of the firearm is the most stable and reliable. Among them, using a modified trapezoidal motion law during the recoil process of external energy firearms can reduce the impulse by 85.86% compared to using an equal acceleration motion law, and using a simple harmonic motion law during the counter recoil process can reduce the impulse by 15.94% compared to using a cycloidal motion law.
Published:	2024-06-28
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