| CPC E21B 10/25 (2013.01) [E21B 10/12 (2013.01); E21B 10/24 (2013.01); E21D 9/104 (2013.01)] | 15 Claims |
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1. A cutting roller, comprising:
a fixed axle with an outside surface and an inner cavity;
a cutting ring rotatably guided on the outside surface of the axle by roller bearings between the cutting ring and the axle, at least part of the roller bearings being connected in fluid communication and being pressurized by pressure in the inner cavity;
a seal sealing the roller bearings from an environment outside of the axle and the cutting ring;
a compensator capable of compensating differential pressures between the roller bearings and the environment, the compensator including an elastically flexible separator element having an inside connected in fluid communication with the environment to be pressurized at environment pressure and having an outside connected in a pressurized manner to the roller bearings, the separator element being in the inner cavity of the axle, the separator element being held in the inner cavity of the axle by an end cap mounted in the inner cavity of the axle, the end cap having a connection channel extending axially through the end cap and having first and second grooves each extending completely across an exterior face of the end cap transversely to the connection channel, each having a constant width and depth, each being open radially outwardly to the environment along an entire length thereof and each being connected in fluid communication to the connection channel at a location that the first and second grooves cross one another; and
a pressurized connection between the roller bearings and the inner cavity in the axle including a cross channel opening into the inner cavity at one end of the cross channel and opening out of the axle at another end of the cross channel.
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