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. Said magnetically permeable insert is arranged at mid part of the latter. Inside of said housing permanent segment-shape magnets are arranged. 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. Piston sets are displaced in opposite directions by timing gear. Said timing gear is composed by bell crank. Proposed engine comprises control unit. Pressure gage is fitted in every cylinder electrically connected with control unit.

EFFECT: lower vibration, higher power output.

3 cl, 4 dwg