Rotary drive for hammer drill - has sleeve with bit and containing drive gear and friction clutch

The drive has a sleeve (4) to which the drill bit is coupled. The rotary drive of the sleeve includes a drive gear (3) and a friction clutch formed by a set of gears (5) which mesh with the drive gear and are axially movable and rotatable relative to the sleeve. The clutch also has friction plates (...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	PORFIRIEVIC BALANDIN,VLADIMIR, PAVLOVIC SISULIN,JURIJ, ANDREEVIC PROCHOROV,IVAN, NIKITOVIC KOLGAN,JURIJ, GRIGORIEVIC GOLDSTEIN,BORIS
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS HAND TOOLS MANIPULATORS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PERCUSSIVE TOOLS PERFORMING OPERATIONS PORTABLE POWER-DRIVEN TOOLS TRANSPORTING
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Beschreibung
Zusammenfassung:	The drive has a sleeve (4) to which the drill bit is coupled. The rotary drive of the sleeve includes a drive gear (3) and a friction clutch formed by a set of gears (5) which mesh with the drive gear and are axially movable and rotatable relative to the sleeve. The clutch also has friction plates (6 and 11) which are axially movable along and rotationally fixed relative to the sleeve. The opposite outer plates are biased by a nut (7) and a spring (8). The nut has, on the side directly engaging the outer friction plate, holes (9) for accommodation of balls (10). The friction plate engaging the nut has corresponding recesses. The balls are received in the nut holes and plate recesses with axial play. This is less than the depth at which the balls enter the recesses or the holes. For adjustment, the nut is rotated relative to the sleeve.