Variable delivery hydraulic equipment

A variable delivery hydraulic equipment, comprising:

• a rotary shaft rotatably supported on a housing;
• a cylinder block disposed coaxially with and connected to the rotary shaft and having a plurality of axial cylinder bores provided on the periphery thereof and disposed coaxial with the rotary shaft;
• a plurality of plunger assemblies each having a pair of plungers oppositely disposed within the respective cylinder bore, so as to define a chamber therebetween and slideably movable within the respective cylinder bore, and a pair of cam followers revolvingly mounted on the outer end of each plunger;
• and,
• a pair of cams between which the cylinder block is disposed, the cams being adapted to contact with the cam followers of the plunger assembly to impart a plurality of recipricatory movements in one cycle to the opposite plungers, each having a cam surface substantially perpendicular to the rotary shafts, and being so designed as to impart different and ever-changing moving speeds to the opposite plungers respectively, in all phase positions except when the moving speeds of both plungers are zero, one of which being swingable relative to the other cam by a piston-cylinder assembly adapted to be operated by an operational fluid within the equipment and being free with respect to the rotary shaft and the housing, and the other cam being fixed to the housing, said swingable cam having a radial groove at the side on which it does not face the cam follower and said piston-cylinder assembly having an operating element fixedly mounted on a piston rod and fitted into the radial groove of the swingable cam.