Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means
Patent
1995-06-29
1996-11-26
Dang, Hoang C.
Boring or penetrating the earth
With storage means for bit lubricant carried by bit or shaft
With fluid pressure-actuated feed means
175363, 175364, 175372, E21B 1020, E21B 1022
Patent
active
055775659
ABSTRACT:
A roller cutter assembly for use in hard rock tunneling machines comprises a rectangular saddle having a rectangular recess with V-shaped mounting surfaces. Support plates are secured against these mounting surfaces, and the support plates have a shaft extending between them with a non-rotatable head in one plate, and the circular nut in the other plate. The shaft mounts a pair of inner races for tapered roller bearings which run directly on the roller cutter inner surface which forms the outer race for the bearing assembly. Rotation of the circular nut in the recess and on the shaft sets the preload for these bearings. Between the nut and its recess on the adjacent support plate is an annular groove formed in both the support plate and the nut, and an elastomeric diaphragm fits across this groove. The inner side communicates with the oil-filled chamber around the bearings, while the outer side has passages through the nut to the exterior so that ambient pressure is transmitted to the diaphragm, and hence, to the lubricating oil, to provide pressure compensation.
REFERENCES:
patent: 3216513 (1965-11-01), Robbins et al.
patent: 3612196 (1972-10-01), Dixon
patent: 3787101 (1974-01-01), Sugden
patent: 3791705 (1974-02-01), Schimel
patent: 4202418 (1980-05-01), Waddell
patent: 5507355 (1996-04-01), Mattsson
Kocab John P.
Ofiara Dennis M.
Boretec, Inc.
Dang Hoang C.
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