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US 6,615,705 B2Granted
Hydraulic cylinder
AssigneeDBT GmbH
InventorsWerner Reinelt, Friedrich-Wilhelm Dannehl
Life of this patent
Estimating the term…
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AssigneeDBT GmbH
InventorsWerner Reinelt, Friedrich-Wilhelm Dannehl
Estimating the term…
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).
A hydraulic cylinder, for use in underground mining, with a locking ring arranged on an outer cylinder tube sealing it at its end with an opening as defined by the locking ring which accommodates an axially movable rod element accommodated in it, whereby the locking ring is provided in the opening as defined by the locking ring which accommodates the rod element, with a sealing arrangement resting on the outer side of the rod element, in which the sealing arrangement has a guide ring provided with grease grooves open to the outer side of the rod element, which is supplied with lubricant for the grease grooves via a lubricant line accessible on the outside on the hydraulic cylinder and which is arranged in an accepting groove formed in the locking ring between an axially inner and an axially outer collar, whereby the gap formed between the outer collar and the rod element is greater than the gap between the rod element (and the inner collar and that the guide ring is arranged axially inside adjacent to an axial further outward lying O-ring seal.
Dependencies are inferred from the claim text.