Oil scraper ring and piston ring set for an internal combustion engine

An oil scraper ring comprising:

• a ring element, having an upper ring edge, a lower ring edge, a ring inner side and a ring outer side,
• wherein the ring element is provided with two opposing contact surfaces, between which there is a ring gap,
• wherein the ring element is provided with an upper scraper bar and a lower scraper bar each extending in a circumferential direction on the ring outer side,
• wherein the oil scraper ring is provided with two main recesses, each in the region of the contact surfaces and extending from the ring outer side toward the ring inner side, and each adjoining at least on the ring outer side, the respective contact surface and the upper ring edge,
• wherein the oil scraper ring is provided with at least one further radial recess in a region spaced apart from the ring gap, which extends at the upper ring edge from the ring outer side toward the ring inner side,
• wherein the main recesses and the at least one further radial recess do not extend completely through the ring element to the ring inner side or to the lower ring edge,
• wherein the main recesses extend into the upper scraper bar, and the upper scraper bar is shorter than the lower scraper bar due to the width of the main recesses, and
• wherein the main recesses are delimited by a part of a spherical surface, a cylindrical surface, a conical surface or a cuboid surface, and
• wherein the at least one further radial recess does not extend into the upper scraper bar.