Dbt Gmbh

Friedrich-Wilhelm Dannehl

Werner Reinelt

A hydraulic cylinder ( ), especially as a pit prop or moving cylinder unit in underground mining, with a locking ring ( ) arranged on an outer cylinder tube ( ) sealing it at its end with a lead through for an axially movable rod element ( ) accommodated in it. The locking ring ( ) is provided in the lead through surrounding the rod element ( ) with a sealing arrangement ( ) resting on the outer side ( ) of the rod element ( ). The sealing arrangement ( ) has a guide ring ( ) provided with grease grooves ( ) open to the outer side ( ) of the rod element ( ), which can, be 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 interlocking ring ( ) between an axially inner and an axially outer collar ( ). 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 ( ).

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Hagen, Germany

Friedrich-Wilhelm Dannehl