FIELD: engines and pumps.
SUBSTANCE: proposed charge comprises grain with central bore to receive tapered bush from incombustible material rigidly secured to bore surface on the charge front face. Outer tapered surface of said bush has annular grooves while bush outer surface is coated with polymer material. Bush and grain bores coating contact surface is corrugated and wavy due to plastic deformation of grain surface in fitting said bush into grain bore. Depth of recesses and height of ledges of said bush coating makes 1.0-2.5 mm. Height of ledges of said bush and distances there between are set to allow for relationships protected by proposed invention.
EFFECT: higher reliability due to better bush coating-to-charge bore joint.
3 cl, 3 dwg
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