Axial-piston engine

An axial-piston engine comprising:

• a body;
• a shaft accommodated in said body;
• said body having cylindrical spaces provided therein, said spaces having axes which are parallel to the axis of said shaft and being spaced equally from said axis;
• double-acting pistons, each piston being respectively housed in one of said cylindrical spaces and defining opposed working and after-piston chambers;
• a wave-like cam for converting the reciprocating motion of said piston into the rotation of said shaft, said cam having curvilinear faces and being fixed on said shaft;
• at least one roller disposed inside said piston and interacting with said curvilinear faces of said wave-like cam;
• said shaft having longitudinal ducts for feeding a working medium;
• said shaft having additional longitudinal ducts for draining off the working medium;
• said shaft having ports to communicate said longitudinal ducts for feeding the working medium with said cylindrical spaces;
• said shaft having additional ports to communicate said additional longitudinal ducts for draining off the working medium with said cylindrical spaces;
• said shaft having a circular groove for feeding the working medium to said longitudinal ducts, said circular groove being disposed on one side of said wave-like cam to communicate with said longitudinal ducts for feeding the working medium;
• said shaft having transverse ducts to connect with each other said longitudinal ducts for feeding the working medium in the zone of said circular groove for feeding the working medium;
• said shaft having an additional circular groove for draining off the working medium from said additional longitudinal ducts, said additional circular groove being disposed on the opposite side of said wave-like cam to communicate with said additional longitudinal ducts for draining off the working medium;
• said shaft having second transverse ducts for connecting with each other said longitudinal ducts for draining off the working medium in the zone of said additional circular groove for draining off the working medium;
• said shaft having third transverse ducts for connecting with each other said longitudinal ducts for feeding the working medium in the zone of said ports of said shaft which are disposed on the side of said additional circular groove for draining off the working medium;
• and said shaft having fourth transverse ducts for connecting with each other said additional longitudinal ducts for draining off the working medium in the zone of said additional ports of said shaft which are disposed on the side of said circular groove for feeding the working medium.