Semi-sealed rotary drill tool
AssigneeSandvik Intellectual Property AB
InventorKarl-Oskar FINNMAN
Life of this patent
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Abstract
A rotary drill tool for cutting rock includes at least one journal leg mounting a spindle and a respective rotary cone cutter. The spindle includes a plurality of fluid distribution passageways arrnaged to provide a supply of a cooling and cleaning fluid to the bearing assembly. Vent holes are provided through the cutter to allow an exhaust flow of fluid and an annular seal is provided at a base region of the spindle to maintain a positive fluid pressure within the cutter cavity to prevent dust and dirt ingress.
Claims15
A rotary drill tool for cutting rock comprising:
- a main body having an internal fluid supply passageway;
- a spindle projecting from the main body and having at least one internal fluid distribution passageway in communication with the supply passageway and extending within the spindle to allow a fluid received from the supply passageway to flow through and exit the spindle;
- a cutter rotatably mounted on the spindle via bearings, the cutter having an external region to cut rock and at least one vent hole to allow the fluid received from the distribution passageway to exit the tool as the cutter is rotated on the spindle;
- and
- an annular seal positioned between a base region of the spindle and the cutter to restrict fluid exiting the tool at the base region.
The tool as claimed in claim h wherein the spindle includes an annular shoulder and an end, the shoulder being positioned axially between the base region and the end, wherein the distribution passageway is divided into at least two distribution passageways, a first distribution passageway exiting the spindle substantially at the shoulder and a second distribution passageway exiting the spindle substantially at the end.
Dependencies are inferred from the claim text.