Hydraulic cylinder for mobile crane has oil feed tube extending inside hollow piston rod tube with variable curvature

摘要

The hydraulic cylinder has a cylinder tube (1) and a piston rod (3) extending from the tube and an oil feed pipe (6) extending through an oil volume (7) in the cylinder tube. The feed pipe is bowed outwardly (10) inside the piston rod, with its outward extension (B) from the axis of the piston rod tube (4) matching the latters inner radius. The curvature has different radii from the axis of the piston rod tube.