PLUNGER-FREE FOUR-CYLINDER ENGINE Russian patent published in 2014 - IPC F02B71/04 

FIELD: engines and pumps.

SUBSTANCE: proposed engine comprises housing, two pairs of opposed cylinders and two sets of pistons. Magnetically permeable insert is arranged between said cylinders. Every piston set is composed of a single assembly with two ends and cylindrical hollow housing. Its mid section accommodates internal magnetically permeable insert and segment-shaped permanent magnets are fitted radially there inside. Engine housing has the clearance between magnetically permeable cylindrical insert and internal magnetically permeable cylindrical insert. At least one excitation coil is fitted there outside. Proposed engine comprises control unit. Pressure gage is fitted in every cylinder electrically connected with control unit.

EFFECT: higher efficiency and reliability.

2 cl, 4 dwg