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US 4,399,878 AGranted
Lubricating device
AssigneesSandvik Aktiebolag, Aktiebolaget Skf
InventorsHarry L. Karlsson, Lars G. Norlander
Life of this patent
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Abstract
A device for lubricating rotary drill bits of the type comprising a roller cutter (14) which is rotatably carried by means of a bearing system (15, 16, 17, 18). Fluid is supplied to the bearing system for cooling and/or cleaning thereof through a passage (31, 32, 33; 51, 61), and a lubricant is delivered to said passage from a body (31; 39) of porous material, which is soaked in lubricating means. For purposes of controlling the supply of lubricating means the porous member forms a fraction of the inner wall of said passage.
Claims7
A rotary drill bit comprising:
- a support,
- at least one roller cutter mounted on said support and including cutting means,
- bearing means disposed in a bearing cavity between said support and said roller cutter,
- at least one first passage means in said support for supplying flushing fluid to a hole being drilled,
- at least one reservoir disposed in said support and containing a flowable lubricant,
- at least one second passage means in said support and communicating with said bearing cavity for conducting fluid thereto, a portion of said second passage means passing through said reservoir upstream of said bearing cavity and being defined by a porous material which communicates with the lubricant in said reservoir to conduct the lubricant into said second passage means.
3 more elements
Dependencies are inferred from the claim text.