Earth boring bit packed lubrication system

Details Earth boring bit packed lubrication system Earth boring bit packed lubrication system

1979-09-13

1981-01-13

Purser, Ernest R.

Boring or penetrating the earth

With storage means for bit lubricant carried by bit or shaft

76108R, 175371, 308 82, E21B 1022, B21K 504

Patent

active

042444306

ABSTRACT:
A rolling cone cutter earth boring bit is provided with an improved lubrication system including an eccentric bearing surface and spaces for lubricant. At least one cantilevered bearing pin extends from the arm of the bit. A rolling cone cutter is rotatably mounted on the bearing pin. The outer bearing surface of the bearing pin is provided with a pair of grooves. The unloaded side surface of the outer bearing surface is formed by eccentric machining. Reduced clearance is provided between the rolling cone cutter and the load side surface and increased clearance is provided between the rolling cone cutter and the unloaded side surface. The pair of grooves and the increased clearance serve as a lubricant reservoir in close proximity to the load side of the bearing pin.

REFERENCES:
patent: 3361494 (1968-01-01), Galle
patent: 3384426 (1968-05-01), Schumacher et al.
patent: 3746405 (1973-07-01), Welton
patent: 3844363 (1974-10-01), Williams
patent: 3890018 (1975-08-01), Clamon
patent: 4010985 (1977-03-01), Rear
patent: 4019785 (1977-04-01), Stinson et al.
patent: 4061376 (1977-12-01), Villaloboz

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