Hydraulic cylinder

US6615705B2 · kind B2 · utility

Assignee

• DBT GMBH · DE

Inventors

• Werner Reinelt · Bochum, DE
• Friedrich Wilhelm Dannehl · Hagen, DE

Key dates

• Filing date: Sep 13, 2001
• Grant date: Sep 9, 2003
• Expiry date: Nov 6, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F15B15/16
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A hydraulic cylinder (10), especially as a pit prop or moving cylinder unit in underground mining, with a locking ring (16) arranged on an outer cylinder tube (11) sealing it at its end with a lead through for an axially movable rod element (12; 13) accommodated in it. The locking ring (16) is provided in the lead through surrounding the rod element (12; 13) with a sealing arrangement (22) resting on the outer side (34) of the rod element (12; 13). The sealing arrangement (22) has a guide ring (29) provided with grease grooves (33) open to the outer side (34) of the rod element (12, 13), which can, be supplied with lubricant for the grease grooves (33) via a lubricant line (35) accessible on the outside on the hydraulic cylinder (10) and which is arranged in an accepting groove (40) formed interlocking ring (16) between an axially inner and an axially outer collar (38; 39). The gap (41) formed between the outer collar (39) and the rod element (12, 13) is greater than the gap (42) between the rod element ((12; 13) and the inner collar (38) and that the guide ring (29) is arranged axially inside adjacent to an axial further outward lying O-ring seal (28).