In-hole rock drilling machine with a hydraulic impact motor

Details In-hole rock drilling machine with a hydraulic impact motor In-hole rock drilling machine with a hydraulic impact motor

1996-06-12

1998-02-10

Tsay, Frank

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

175297, 173 17, 173 80, E21B 414, E21B 1060

Patent

active

057158975

ABSTRACT:
An in-hole rock drilling machine has a hydraulic impact motor within a housing. The hydraulic impact motor has a spool valve contained within a valve housing. The spool valve has two operating positions to alternately pressurize and depressurize a drive chamber to reciprocate a hammer. The spool valve has a continuously pressurized third control surface that biases the spool valve towards a second operating position, a first control surface that acts opposite the third control surface to move the spool valve to a first operating position, and a second control surface that acts with the third control surface to return the spool valve to the second operating position. The valve housing guides the rear portion of the hammer, and a guide bushing guides the front portion of the hammer. The guide bushing, valve housing, and a distance sleeve are clamped against a shoulder of the housing. The distance sleeve compresses axially to compensate for the axial tolerances of the component parts, thereby making axial tolerances less critical, and assembly and disassembly simple.

REFERENCES:
patent: 3896886 (1975-07-01), Roscoe, Jr.
patent: 4172411 (1979-10-01), Matsuda et al.
patent: 4278135 (1981-07-01), Curington
patent: 4534422 (1985-08-01), Rear
patent: 4583601 (1986-04-01), Techy
patent: 4819746 (1989-04-01), Brown et al.
patent: 4921056 (1990-05-01), Ennis
patent: 5056606 (1991-10-01), Barthomeuf

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