PISTON ENGINE Russian patent published in 1994 - IPC

FIELD: automobile compressors. SUBSTANCE: piston engine has piston 2 with rod 3 arranged in working cylinder 1, distributing device which has retainer and change-over spool valve kinematically linked with rod 3 of cylinder 1 by means of two-position intermittent engagement mechanism 5 and connected by means of two lines to the chambers of drive for shifting memory spool valve 9 which is spring-loaded on one side; two working lines of this spool valve are connected to chambers of working cylinder 1. Piston engine is provided with at least one piston compensator 15 coupled with the connecting line and provided with bypass valve 13 fitted between connecting lines of change-over spool valve 6 whose engagement mechanism 5 in mounted coaxially relative to rod 3 of working cylinder 1. Retainer is made in form of two bands 7 fitted over edges of change-over spool valve 6 forming end chambers each of which is coupled with one of connecting lines. Shifting drive is made in form of piston 1 supported by spring 12 of memory spool valve 9. EFFECT: enhanced efficiency. 1 dwg