HYDRAULIC PISTON AND CYLINDER ARRANGEMENT IN WHICH THE OUTER WALL OF THE PISTON ROD IS FREE FROM FLUID

摘要

"HYDRAULIC PISTON AND CYLINDER ARRANGEMENT IN WHICH THE OUTER WALL OF THE PISTON ROD IS FREE FROM FLUID" A hydraulic piston and cylinder arrangement retains the outer surface of a sleeve forming the piston in dry condition. The cylinder provides an outer wall and an inner stem with the sleeve sliding inwardly of the outer wall and outwardly of the stem. A head on the end of the stem cooperates with the inner surface of the sleeve. A bearing member on the end of the sleeve remote from the head cooperates with the outer surface of the stem. A first chamber is thus defined between the head and a closure cap on the sleeve to provide an expansion chamber. An annular chamber between the outer surface of the stem and the inner surface of the sleeve and closed by the bearing member provides a return chamber. Two fluid channels coaxially arranged within the stem provide the communication of fluid to the chambers.