FIELD: process engineering.
SUBSTANCE: invention relates to machine building, particularly, to percussion machine heads. Proposed head comprises cylindrical piston and impact taper parts. Transition between head cylindrical and taper parts is made in arc of circle. Relationship between taper impact part l1 and cylindrical piston part l2 is defined as follows to ensure position of head center of gravity at its piston cylindrical part: 
where d is head impart face diameter, D is diameter of head idle face.
EFFECT: higher efficiency.
1 dwg
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