PISTON ASSEMBLY OF MACHINE FOR CASTING UNDER PRESSURE Russian patent published in 2023 - IPC B22D17/20 

FIELD: casting production.

SUBSTANCE: piston assembly of a machine for casting under pressure contains a piston and rod (1) interconnected by means of thread on side surfaces, with longitudinal channel (2) for tube (3), on which, at a rear end, a sealing element is installed, and at a front end – hollow shank (5) coming to disc (8) placed without gaps between a front end of the rod and piston cavity bottom (9). From the front end of the rod, a longitudinal cavity for the hollow shank, an end of which is separated with an axial gap from the cavity bottom and is located behind front transverse windows of the rod, is made. Front transverse windows of the rod are connected to its longitudinal cavity for the hollow shank with longitudinal grooves on the hollow shank, opened to the longitudinal cavity of the rod with rear edges located at the end of the shank, and opened with front edges to annular groove (16) of the shank, placed in a zone of inner edges of front transverse windows of the rod. A front part of the tube is permanently connected to an inner surface of the shank cavity, and its end is located between front transverse windows of the rod and its rear end.

EFFECT: increase in the strength of a rod by its front transverse windows and reliability of an assembly.

1 cl, 1 dwg