AXIAL-PISTON HYDRAULIC MACHINE WITH PICKUP OF CONTROL PISTON POSITION Russian patent published in 2006 - IPC F04B1/30 

FIELD: positive-displacement machines.

SUBSTANCE: machine comprises housing of the bearings of rocking unit, housing of the control mechanism, and rocking unit. The piston of control of position of rocking unit is mounted in the space of the housing of the control mechanism. The pickup of position of the control piston is made of a linear transformer. The space of the housing of the control mechanism receives the member-insert that is provided with the inner space and is used as a frame for the linear transformer. The control piston is set in the member-insert and represents the core of the linear transformer. The inner space of the member-insert is connected with the high-pressure passage. The member-insert is made of nonmagnetic material, and the control piston is made of magnetic material. The windings of the linear transformer are led out from the outer surface of the member-insert insulated from the fluid. The height of the winding of the linear transformer is no less than the length of the stroke of the control piston.

EFFECT: reduced sizes and enhanced reliability.

2 dwg