FIELD: machine building.
SUBSTANCE: invention relates to mechanisms transforming straight-line movement of a piston to shaft rotation. A mechanism with no piston-rods includes a housing and a multithrow crankshaft, each link of the crank of which together with the crankshaft main journal, a jaw and a piston-rod journal includes a sun gear, a solar-and-planetary gear and a planetary satellite gear, as well as an eccentric coupling with a possibility of being rotated on the piston-rod journal, and a piston stock. The solar gear is rigidly fixed on the housing; the solar and planetary gear is rigidly fixed on the end face of the eccentric coupling, and the planetary satellite gear is arranged on the jaw with a possibility of free rotation and simultaneous engagement with the solar and solar-and-planetary gears. The crank shaft body with the planetary satellite gears passes inside the solar gears and the solar-and-planetary gears. With that, radii of the latter are equal to the radius of the crank of the crankshaft, the radius of eccentricity of the eccentric coupling and one fourth of the diameter of the solar gear.
EFFECT: achieving improvement of stiffness of the device design; increasing its durability and service life.
8 cl, 2 dwg
