Cylinder of an internal combustion engine

A cylinder of an internal combustion engine, comprising:

• a cylinder liner;
• a cylinder piston guided in the cylinder liner, comprising:
• at least two ring grooves, wherein each ring groove is limited by an upper groove flank, a lower groove flank, and a groove base,
• at least one ring land that limit the at least two ring grooves and separate the at least two ring grooves from one another;
• a respective piston ring formed as a compression ring or as an oil scraper ring received in each of the at least two ring grooves, wherein each piston ring comprises:
• a lower ring flank facing the lower groove flank of a respective ring groove;
• a single planar upper ring flank facing the upper groove flank of the respective ring groove;
• a ring back facing the groove base of the respective ring groove that is planar and extends uninterruptedly axially between the lower ring flank facing and the upper ring flank;
• and
• a portion located opposite the ring back lying against a radially inner running surface of the cylinder liner,
• wherein the single planar upper ring flank extends uninterruptedly radially between the ring back and the portion located opposite the ring back;
• and
• a single recess located in at least one of:
• the lower groove flank of at least one ring groove receiving one of the respective piston rings and radially offset from at least the ring back and radially offset from a radially outer surface of the cylinder piston;
• and
• the lower ring flank of at least one of the respective piston rings and radially offset from at least the groove base,
• wherein at least one additional recess is located in the other of:
• the lower groove flank of the at least one ring groove receiving the piston ring;
• and
• the lower ring flank of the at least one piston ring.

A cylinder of an internal combustion engine, comprising:

• a cylinder liner;
• a cylinder piston guided in the cylinder liner, comprising:
• at least two ring grooves, wherein each ring groove is limited by an upper groove flank, a lower groove flank, and a groove base,
• at least one ring land that limit the at least two ring grooves and separate the multiple ring grooves from one another;
• a respective piston ring formed as a compression ring or as an oil scraper ring received in each of the at least two ring grooves, wherein each piston ring comprises:
• a lower ring flank facing the lower groove flank of a respective ring groove;
• a single planar upper ring flank facing the upper groove flank of the respective ring groove;
• a ring back facing the groove base of the respective ring groove that is planar and extends uninterruptedly axially between the lower ring flank facing and the upper ring flank;
• and
• a portion located opposite the ring back lying against a radially inner running surface of the cylinder liner,
• wherein the single planar upper ring flank extends uninterruptedly radially between the ring back and the portion located opposite the ring back;
• and
• a single recess located in at least one of:
• the lower groove flank of at least one ring groove receiving one of the respective piston rings and radially offset from a radially outer surface of the cylinder piston;
• and
• the lower ring flank of at least one of the respective piston rings,
• wherein at least one additional recess is located in the other of:
• the lower groove flank of the at least one ring groove receiving the piston ring;
• and
• the lower ring flank of the at least one piston ring,
• wherein the recess formed in the lower groove flank of the respective ring groove and the recess formed in the lower ring flank of the respective piston ring do not overlap one another in a radial direction.