HYDRAULIC CYLINDER Russian patent published in 2000 - IPC

FIELD: hydraulic control systems. SUBSTANCE: hydraulic cylinder is used in hydraulic systems of antibend pressure control of finishing stand operating rolls of strip mills as antibend hydraulic cylinder. Cylinder has body, piston with rod, rod cavity and piston cavity, which is provided with oil delivery and drain hole. Safety device shaped as bellows is mounted around rod in rod cavity for environmental air access to protected cavity. Bellows end is secured on end part of body cover from side of rod cavity, and its other end is attached to circular part of piston. Places of bellows end fastening are arranged in circular hollows made on end part of body cover from side of rod cavity and on piston circular part, respectively. Width of circular hollows exceeds width of bellows corrugations, and summary depth of circular hollows is not less than height of compressed bellows. To provide for access of environmental air to protected cavity, rod is spaced from moving contact surface of body cover, and end of bellows directed upwards during cylinder installation in hydraulic system is secured in primary variant of design by means of shaped ring with formation of nonpressed sections. EFFECT: enlarged mechanical capabilities. 3 cl, 1 dwg