| 摘要 |
This drillhead unit includes a sealed housing mounting a bevel gear assembly and a bevel drive pinion assembly. The bevel gear assembly includes a hollow shaft providing a chuck for receiving a hollow drill bit and the bevel pinion assembly includes a shaft providing a connection for a hydraulic drive motor. The hollow shaft is connected to a cavity within the housing, which is connected to exhaust passages connected to a vacuum source. A vacuum sealing assembly is provided within the housing between the bevel gear assembly and the housing to eliminate bearing lubrication loss. The unit can also be used for reverse flow positive water pressure in lieu of a vacuum.
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