The piston engine has an annular pivoting disk (6) driven by an engine shaft (5) and is adjustably inclined thereto. Said disk drives adjacent pistons (2) arranged in a peripheral direction and is connected in an articulated manner to a sliding sleeve (21) which is axially guided on the engine shaft (5) and is also connected to a driver (13) which transmits driving force and is located at a distance from said engine shaft (5). The annular shape of the pivoting disk (6) is advantageous in terms of dynamics and production. It enables the driver (13) to engage in a radial bore hole (16) of the pivoting disk in an articulated manner, thus saving space.