Hydraulic drive unit for driving a drilling tool

Details Hydraulic drive unit for driving a drilling tool Hydraulic drive unit for driving a drilling tool

1993-12-03

1995-08-01

Smith, Scott A.

Tool driving or impacting

Drive adjustable to completely change kind of drive

173206, 173222, F21B 302

Patent

active

054373387

ABSTRACT:
This invention relates to a drive unit comprising a frame; a rotating shaft, a first fluid motor presenting a cam fixed with respect to the frame; and a cylinder block fast with the shaft driven by the first motor at a first speed of rotation.
According to the invention, the shaft presents a recess conveying a drilling fluid; the cylinder block of the first motor is coaxial to the axis of rotation; drive unit comprises a second motor coupled in rotation to the shaft and driving it at a second speed of rotation higher than the first speed of rotation; a first pinion gear is fast with and coaxial to the shaft; the second motor presents an output shaft fast with a second pinion gear meshing with the first pinion gear; and the first motor is of the type with "disengageable pistons".
One application is the production of a high-performance drilling assembly.

REFERENCES:
patent: 1717999 (1929-06-01), Olsen
patent: 1913003 (1933-06-01), Shaff
patent: 3074381 (1963-01-01), Osgood
patent: 3406763 (1968-10-01), Worman
patent: 3766995 (1973-10-01), Young et al.
patent: 4854395 (1989-08-01), Kassieur et al.

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