| 摘要 |
A down-hole rock drilling machine (in-hole rock drilling machine) has a carrier sleeve (22) mounted in combined axial and radial bearings (21, 22 and 23, 24) and the carrier sleeve carries a guiding tube (30) laterally of the machine with an element (31) inbetween. The bearings (21, 22 and 23, 24) and the carrier sleeve (22) are held axially together between a shoulder (17) on the machine housing (11) and a drill bit holding sleeve (13). The machine housing will be subjected to strong vibrations, but since the bit holding sleeve (13) is screwed to the machine housing (11) and transmits the rotation to the drill bit (14), the carrier sleeve bearing arrangement will be secured.
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