Axial piston machine of adjustable stroke

An axial-piston machine comprising:

• a housing surrounding a main axis and formed with a seat shaped at least partially as a surface of revolution centered on a transverse axis extending across said main axis;
• a rotor in said housing rotatable therein about said main axis and provided with at least one piston reciprocal parallel to said main axis and having an end protruding from said rotor parallel to said main axis;
• a rocker in said housing having a front face turned toward said rotor and engageable with said end and a back face turned away from said rotor, said rocker resting in said seat and being tiltable therein about said transverse axis, whereby the angular position of said rocker determines the stroke of said piston, said back face and said seat forming a pressurizable compartment offset from said transverse axis, said surface of revolution being a cylinder and said transverse axis being perpendiclar to said main axis, said back face and said seat forming a pair of such compartments to either side of said main and transverse axes, whereby tipping of said rocker about said transverse axis increases the volume of one of said compartments and decreases the volume of the other;
• and
• means for introducing fluid selectively into said compartments and for applying fluid pressure directly to said back face and thereby tip said rocker about said transverse axis.