VARIABLE CAPACITY HYDROSTATIC AXIAL PISTON MACHINE

The invention relates to a variable capacity hydrostatic axial piston machine having a drive shaft which has a drive flange having an end face oriented towards displacement pistons in which end face spherical shells for holding substantially spherical piston heads are formed. The calotte of the spherical shells in this case go beyond the semisphere and each have a circular opening with a smaller diameter than the spherical shell diameter. The spherical calotte of the piston heads have a recess having a smaller diameter than that of the circular opening of the spherical shells so that at the vertex of the piston a spherical section making up less than the semisphere and, spaced apart from the latter by the recess a retaining collar having a larger diameter than the circular opening of the spherical shells are formed. A transverse groove is formed in the circular openings of the spherical shells in such a way that the piston head with the retaining collar can be threaded into the spherical shell through the transverse groove and is retained there in the working position of the piston.