Oscillating disc cutter with speed controlling bearings
AssigneeOdyssey Technology Pty Ltd
InventorDavid Burnet Sugden
Life of this patent
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Abstract
An oscillating disc cutter including a cutting disc and a drive mechanism. The drive mechanism includes a drive shaft to effect eccentric oscillation of the cutting disc and a radial bearing disposed to permit relative rotation between the drive shaft and the cutting disc. The cutter further including a hydrostatic axial bearing disposed to react axial forces while accommodating induced rotation of the cutting disc when operatively engaged and to induce a rotational drag thereby limiting rotational peed of the cutting disc when free running. A water pressurized fluid bearing induces a predetermined axial load in the hydrostatic bearing such that a predetermined maximum running clearance in the hydrostatic bearing is maintained.
Claims20
An oscillating disc cutter including:
- a housing;
- a cutting disc;
- and
- a drive mechanism, the drive mechanism including:
- a drive shaft mounted within said housing for a bearing for rotation about a longitudinal shaft rotation axis with respect to said housing, said shaft including a driven section and an offset mounting section fixed to said driven section, said mounting section including a mounting axis parallel to and spaced from said shaft rotation axis;
- wherein said cutting disc is rotationally mounted to said mounting section about said mounting axis such that rotation of said shaft induces lateral eccentric oscillation of the cutting disc;
- and
- a radial bearing disposed between the mounting section of the drive shaft and the cutting disc to permit relative and generally free rotation of the cutting disc on the drive shaft;
- the cutter further including a first axial friction inducing bearing disposed directly between the disc and said housing to transmit axial loads exerted on the disc to the housing while accommodating generally a free rotation of the cutting disc with respect to said housing when operatively engaged and wherein said friction bearing induces a rotational drag between said disc and said housing thereby limiting rotational speed of the cutting disc when free running to an angular velocity below that of the drive shaft.
Dependencies are inferred from the claim text.