The present disclosure relates to a hydraulic cylinder, a hydraulic system and a crane. The hydraulic cylinder comprises: a cylinder body; a first piston disposed in the cylinder body and capable of moving along an axial direction of the cylinder body; and a piston rod with one end connected on the first piston and extending along the axial direction of the cylinder body, wherein the cylinder body has a first cavity positioned on one side of the first piston facing away from the piston rod, the first cavity is capable of introducing and discharging hydraulic fluid, the piston rod has a second cavity extending along the axial direction of the cylinder body; and the hydraulic cylinder further comprises a second piston capable of moving along the second cavity, the second piston is fixed relative to the cylinder body, the second cavity comprises an accommodating cavity positioned on one side of the second piston facing the first piston, when the first cavity introduces the hydraulic fluid, the accommodating cavity can discharge the hydraulic fluid, and when the first cavity discharges the hydraulic fluid, the accommodating cavity can introduce the hydraulic fluid. The technical solution of the present application improves the problem that the amount of change of the hydraulic fluid in the hydraulic cylinder is large in the moving process of the piston rod in the related art.
HYDRAULIC CYLINDER, HYDRAULIC SYSTEM, AND CRANE
2019-10-24
Patent
Elektronische Ressource
Englisch
Hydraulic cylinder control device, variable amplitude hydraulic system and crane
Europäisches Patentamt | 2020
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