Abstract: The invention relates to a rolled plain bearing bush, having a butt joint, an axial direction, a radial direction, and a peripheral direction, comprising a first semicylindrical segment and a second semicylindrical segment, which are arranged diametrically opposite each other, and a third segment and a fourth segment, which each deviate from the semicylindrical shape of the first and second segments and are arranged between the first and second segments in the peripheral direction and diametrically opposite each other, wherein the first and second segments each have a semicylindrical inner peripheral surface and outer peripheral surface, and wherein the third and fourth segments each have a flat inner peripheral surface, which flat inner peripheral surfaces extend parallel to each other, wherein a smallest radial distance between the inner peripheral surfaces of the third and fourth segments is less than a bush inside diameter, which corresponds to a radial distance between the inner peripheral surfaces of th

Abstract: The invention relates to a rolled plain bearing bush, having a butt joint, an axial direction, a radial direction, and a peripheral direction, comprising a first semicylindrical segment and a second semicylindrical segment, which are arranged diametrically opposite each other, and a third segment and a fourth segment, which each deviate from the semicylindrical shape of the first and second segments and are arranged between the first and second segments in the peripheral direction and diametrically opposite each other, wherein the first and second segments each have a semicylindrical inner peripheral surface and outer peripheral surface, and wherein the third and fourth segments each have a flat inner peripheral surface, which flat inner peripheral surfaces extend parallel to each other, wherein a smallest radial distance between the inner peripheral surfaces of the third and fourth segments is less than a bush inside diameter, which corresponds to a radial distance between the inner peripheral surfaces of th

Abstract: The invention relates to a plain bearing shell (2), having a substantially semicylindrical geometry, for use in a piston (50) of a radial piston engine for the purposes of mounting a roller or shaft, having an axial direction (4), a radial direction (6) and a circumferential direction (8) of the plain bearing shell, having two face sides (10, 12) which face away from one another in the axial direction (4), having a radially outer side (14) and a radially inner side (16) which faces toward the roller or shaft and which receives said roller or shaft such that it can slide in the circumferential direction (8); it is proposed according to the invention that, on at least one face side (10, 12), there is provided a projection (18) which protrudes in the axial direction (4) of the plain bearing shell and which serves to form a means for preventing rotation in the circumferential direction (8).