PISTON DEVICE OF PUMP Russian patent published in 2020 - IPC F04B19/02 

FIELD: machine building.

SUBSTANCE: invention relates to hydraulic machines of positive displacement. Piston device comprises housing 1, crankshaft 2 installed in housing 1 with possibility of rotation around its axis of rotation and having at least one crankpin 21. First external gear wheel 5 is connected to crank shaft 2 with possibility of rotation together with the specified shaft. Second external gear wheel 6 is installed with possibility of engagement with the first external gear wheel 5. Proposed device comprises crank element 7, reciprocating piston 3 and piston engagement means of crank element 8. First external gear wheel 5 is connected with crankshaft 2 via eccentric 4 fitted on crankpin 21 of crankshaft 2. Connection means 8 comprises first part 81 in form of a rod connected to the piston, and second part 82 made bifurcated in the form of a fork. Branches 83 of fork 82 are installed in longitudinal guides 84 made in housing 1 with the possibility of back-and-forth movement. Second outer gear wheel 6 is located between branches 83 of connection means fork 82. Crank element 7 is installed eccentrically relative to axis of symmetry of the second gear wheel 6 and with possibility of rotation of the second gear wheel 8 around longitudinal axis 71 of the crank element. Opposite ends 72 of crank element 7 are installed in branches 83 of connection means fork 82.

EFFECT: simplified design.

1 cl, 3 dwg