Cutter for boring head
AssigneeSandvik Intellectual Property AB
InventorsAnders Lindblom, Joona Loikkanen
Life of this patent
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Abstract
A cutter for a boring head having a shaft is mountable at a saddle. A roller body is rotatably mounted about the shaft via bearings housed at a cavity located radially between the shaft and the roller body. A lubrication fluid is configured to flow internally within the shaft via a first and second passageway. An elongate overflow chamber is provided in fluid communication with the passageways to receive thermally expanded lubrication fluid from the cavity.
Claims15
A cutter for a boring head, the cutter comprising:
- a shaft having a longitudinal axis mountable at a saddle of a boring head;
- a frusto-conical roller body rotatably mounted about the shaft and having cutting elements provided at an external face;
- bearings mounted within an annular cavity located radially between the shaft and the roller body;
- a first passageway centred on the axis of the shaft and extending axially through the shaft from a first end, which first end is located at the distal end of the roller body having the smallest diameter;
- a second passageway extending transverse or perpendicular to the first passageway to provide a fluid link between the first passageway and the cavity;
- and
- an elongate overflow chamber centred on the axis of the shaft and formed as an elongate axial extension of the first passageway to extend axially through the shaft beyond the second passageway as a blind bore, the chamber having an unoccupied internal volume along its axial length configured to receive a lubrication fluid from the annular cavity.
A boring head comprising a plurality of cutters, each of the cutters including a shaft having a longitudinal axis mountable at a saddle of a boring head, a frusto-conical roller body rotatably mounted about the shaft and having cutting elements provided at an external face, bearings mounted within an annular cavity located radially between the shaft and the roller body, a first passageway centred on the axis of the shaft and extending axially through the shaft from a first end, which first end is located at the distal end of the roller body having the smallest diameter, a second passageway extending transverse or perpendicular to the first passageway to provide a fluid link between the first passageway and the cavity, and an elongate overflow chamber centred on the axis of the shaft and formed as an elongate axial extension of the first passageway to extend axially through the shaft beyond the second passageway as a blind bore, the chamber having an unoccupied internal volume along its axial length configured to receive a lubrication fluid from the annular cavity.
Dependencies are inferred from the claim text.