Improvements in Thrust Bearings for Shafts.
Year: 1894

page_text: COMPLETE SPECIFICATION.
Improvements in Thrust Bearings for Shafts.
I, IVAR CORNELIUSSEN, of 207 West Indiana Street, Chicago, County of Cook,
State of Illinois, United States of America, Blacksmith, do hereby declare the
nature of this invention and in what manner the same is to be performed
to be particularly described and ascertained in and by the following statement :—
My invention relates to journals for thrust shafts, particularly for the shafts of
screw propellers. Its object is to provide a fluid bearing for such shafts and
to pack the journal box against leakage of the liquid, and to adapt the journal for
use between the crank of the shaft and its screw
The invention consists of the use of a circumferential rib upon the shaft, a
journal box adapted to receive the rib and having chambers upon each side of it
filled with oil or other liquid, and a special arrangement of packing material for
retaining the liquid. It consists further of the special form of applying power to a
pump for replenishing the liquid, as shown and described.
In the accompanying drawings,
Fig. 1, is an end elevation of the journal block, the shaft being shown in
section.
Fig. 2, 15 a longitudinal section on the line 2-2 of Fig. 1.
Fig. 3, is a transverse section on the line 3-3 of Figure 2.
Fig. 4, is an inside elevation of one of the glands of the journal box, showing the
packing rings.
Figs. 5 and 6 are details of the packing rings.
The journal box consists of the pillow block A, and the cap B, adapted to fit
thereon, these two parts being secured together by bolts, one of which is shown at a,
and its nut at b.
The contiguous sides of the block A, and cap B, are longitudinally centrally
recessed so as together to form an aperture for the shaft C. The shaft C, is
provided with an annular rib or band c. The shaft aperture of the box is of
greater diameter than this band c, at both ends, but 18 reduced to the same
diameter at the center, the pillow block A, and cap B, each having an internal
rib a', ', which together form an annular rib. This rib is of less width than the
band c.
The ends of the journal box are closed by glands D, E, bolted to the pillow block
and cap by the bolts d, e. These glands extend into the shaft aperture of the box
but do not reach to the band c. The intervening space between the ends of the
glands and the band c, is filled with the liquid used for the journal bearing. These
chambers are indicated at F, F. When pressure 18 from the direction of the
gland E, it is resisted by the liquid cushion F, when from the opposite direction it
is resisted by the cushion F¹.
In order to prevent leakage from one ohamber to the other, flexible packing
rings G, G, are placed around the baud c, at each side of the rib a, b, and the faces
of these rings which are exposed to the liquid are V-shaped so that the prossure
tends to force the edges laterally. The inner ends of the glands D, E, are
bevelled at their edges and the triangular spaces thus formed are filled with
flexible packing rings H, H. The wedge shape of these rings insures a tight joint
around the glands.
The inner end of the shaft aperture of each glaud is enlarged to receive the
packing rings K. K. of flexible material. To prevent the rings G. G. K. K. from

page_text: turning with the shaft, the seat of each is indented or notched as shown at k,
as to the seat of the ing K, and the rings assume the same form as shown
at
At M, M, are shown ducts entering the chambers F, F', through the cap B, for
the purpose of introducing the liquid into such chambers. Any form of pump may
be used for this purpose The construction of pumps and the means of attaching
them to such ducts being well known I have not deemed it necessary to show more
than the means for automatically operating the pump. This consists of the
friction gear mounted upon the shaft C, and shown at Q, and a co-operating
gear P, mounted upon the driving shaft O, of the pump. The periphery of the
gear P, 18 grooved and the edges of the rim of the gear Q, are bevelled to
correspond with this groove. The two gears are so sot that when the shaft is in its
normal position with reference to the journal box they are not in contact, but the
bevelled edges of the gear Q, nie so close to the sides of the groove of the gear P,
that a very slight longitudinal movement of the shaft C, in either direction brings
the two gears into contact and the pump is set in motion. If therefore there is any
escape of liquid, even of a very small quantity, from either of the chambers F, Fi,
the loss 18 immediately made good by the action of the pump. As soon as the
normal quantity of liquid is restored in the chambers the shaft is brought back to
its proper position and the gears P, Q, are separated and the pump stopped.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1. The combination with a thrust shaft having a band C, of a journal box
enclosing the shaft and having an internal annular rib of less width than the band C,
and serving as a 'cn cumferential bearing therefor, glands D, E, for closing the ends
of the box and adapted to form with the band and with the walls of the box annular
chambers at each side of the band, liquid filling the chambers, and packing
rings G, G, for preventing communication between the chambers, substantially as
described and foi the purpose set forth.
2. The combination with a thrust shaft having a baud C, of a journal box
enclosing the shaft and having an internal aunular rib of less width than the
band C, and serving as a circumferential bearing therefor, glands D, E, for closing
the ends of the box and adapted to form with the band and with the walls of the
box annular chambers at each side of the band, liquid filling the chambers, packing
rings G, G, for preventing communication between the chambers, ducts leading to
the chambers, and menus for automatically replenishing the liquid, substantially as
described and for the purpose set forth.
this aren any of December 2009.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.