Abstract: A packing seal for the piston of a reciprocating engine can be inserted into a circumferential groove of the piston and is provided with three segment rings that adjoin each other in an axial direction, i.e. a second (lower) segment ring, a first (top) segment ring thereabove, and a conical pressure securing ring above the first segment ring. The second (lower) segment ring is characterized in that the ends of the seal segments and the lock parts which adjoin each other in the peripheral direction radially engage behind one another in a hook-like manner, the seal segments being provided with an inward-pointing hook and the lock parts being equipped with an outward-pointing hook.

Abstract: A packing seal is provided which is intended in particular for reciprocating piston engines and which can be placed into a circumferential groove of a piston of such a reciprocating piston engine. The packing seal includes a first segment ring (1), which has at least two sealing segments (3) and locking segments (4) arranged between them in alternating order. These locking segments (4) and sealing segments (3) taper wedge-shaped in opposite directions radially inward and outward, respectively. In addition, the packing seal includes at least one additional or second segment ring (20) which also has at least two sealing segments (23) and locking segments (24) arranged between them in alternating order. The sealing segments (23) and locking segments (24) both taper radially inward in this case. The locking segments (24) extend over a larger arc area than the sealing segments (23).