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Патент USA US2403489

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July 9, 1946.
2,403,489
R. BIRMANN
BEARING CONSTRUCTION FORy TURBINES OR THE LIKE
Filed Aug. 29, 1941
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extending flanges I3 the edges of which, having
slight clearance with annular bores of elements
3 and 5 limit radial displacement of the bearing.
These ilanges I3 are also provided with openings
into which project pins I8, which project also
through openings in the member ‘I and the re
spective elements' 3 and 5, thereby preventing
relative rotations of these various parte. The
pins fit the openings in member 'I loosely, how
true center of gravity, with the result that the
phenomena resulting from reaching of critical
speed will not appear. Substantial resiliency is
thus provided with a-high degree of damping, so
that there are no tendencies toward the build
'I'he oil in the iilms between
' ing up of vibrations.
the sleeves is caused to now continuously in
wardly andl outwardly, as deflections of the sleeve
occur, but with the reduced resiliency«provided
ever, so as to permit tilting of the shaft and the 10 by the construction. it is substantially impossible
inner elements of the bearings relative to the
for :the oil. to be forced completely out of the
space between the sleeves to destroy the damping
,
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,
The members I2 and I4 are ,provided with cir
action. While in the specific modiiloation of the
cumferentially extending 'pads 20 supporting in
invention illustrated a thrust bearing is shown.
ternally the bundle of nestedsleeves 22 to which 15 it will be obvious that the invention is equally
applicable to a plain journal. The necessity for
further reference will be made hereafter. These
sleeves iill the space between the pads 20 and
the provision oi’ a spherical mounting may not
the inner surfaces oi the elements 3 and d. These
always arise, since the sleeves provide by their
latter sin/faces are provided with oil grooves indi
resiliency a substantial capability of universal
catd at ¿.8 communicating with radially extend 20 movement, involving a substantial freedom for
tilting.
ing openings 2t and 3D in element t and member
'I, respectively, Oil under pressure is furnished
.The longitudinally extending pads on the
sleeves-may be readily provided by turning the
to the openings t0 as described in said prior ap
member 1.
plication.
sleeves on a lathe with the provision oi’ cam
The nature voi’ the sleeves 22 is illustrated to a 25 means for slightly displacing the tool outwardly
distorted scale in Figures «1 and 2. Each of the
periodically for the formation of the pads.
sleeves is provided with a cylindrical inner sur
face. The sleeves form two groups, which `are
However, quite eiiective pads may be provided in ‘
other` ways. For example, as illustrated in the
similar yin construction with the exception of an
modiilcation of Figures 3 and 4, in which therein
gular displacements of longitudinally ‘extending 30 illustrated a sleeve adapted to be associated in
pads, indicated at 32 and 3l, respectively, and
staggered relationship with others in which the
formed as slight projections from the outer sur
faces of the sleeves. While other relative ar
rangement of the pads may be provided, it will
exteriorly projecting pad is provided by knurling,
as indicated at 38, which will effect an extruding
of metal points or projections outwardly _to the
be observed from Figure 2 that each sleeve is pro 35 extentl of the necessary few thousandths of an
vided with four pads arranged at 90° spacings,
inch clearance between the sleeves. Uniform
and whenthe sleeves are nested, the pads of
_projection may then be secured by grinding.
adjacent sleeves are located 45° from each other,
The pads may also be built up by metallic (e. g.,
providing a staggered arrangement. The main
chromium) plating, or by etching away with acid
tenance of these positions is effected by providing 40 portions of the sleeves leaving the pads.
notches 2t in the edgesof the sleeves embracing
While longitudinally extending pads have been
the pins I8, thus preventing relative rotation
primarily mentioned, the localized areas of con
thereof and also maintaining the nested groups
tact may be provided by pads arranged otherwise,
stationary within the outer portions of »the bear
since the same resiliency conditions will be
ings. 'I'he pads which have been described are 45 achieved in general if local Dads are provided
raised several thousandths of an inch, for exam
which are in staggered relationship to each other
ple .005 inch, above the adjacent cylindrical por
on adjacent rings. It will be evident, in fact,
tions of rtheir respectivesleeves, with the result
that a similar action may also be obtained if cer
that there are provided oil receiving spacings
tain of the sleeves are provided with pads on.
several thousandths of an inch thick between 50 both their inner and outer surfaces and inter
each pair of sleeves. By reason of the stag
mediate pads are provided with. cylindrical inner
gered arrangement oi' the pads, it will be evident
and outer surfaces.
that each pad is subjected to pressure tending to
'What I claim. and desire to protect by letters
force it outwardly and will apply such pressure at s
Patent is:
a point .intermediate the pads on the next outer 55 ‘ l. In combination, a high speed shaft, a cas
sleeve, with the result that flexure to some extent
, ing, a bundleloi nested sleeves mounted in the
may occur, reducing the size of the oil receiving
casing and mounting said shaft, adjacent sur
space on the outside of the last mentioned sleeve.
faces of sleeves of said bundle having localizedv
The pressure thus exerted, furthermore, will be
regions oi.' contact with each other and being sep
applied through the adjacent pads of the last 60 arated between such regions oi’ contact to pro
mentioned sleeve to flex the next outer sleeve, and
vide capillary oil spaces, the regions of contact of
so on. Thus any pressure exerted by the shaft
the inner and outer surfaces oi each sleeve being
during rotation, in its tendency to rotate about
substantially out oi radial alignment, so that
an axis eccentric to its geometrical one, will be
relative riexures oi adjacent sleeves modifying
taken up by the ñexures of the various sleeves 65 the thickness of said capillary oil spaces may
between their pad portions with alternate reduc
occur between their regions of contact with each
tion and enlargement oi’ the oil- spaces, as the
lother due to pressures exerted at the regions of
shaft revolves, to effect a damping action. As
contact on their non-adjacent surfaces and
compared with the arrangement described in my
means for supplying oil to said capillary spaces.
prior application, a somewhat greater restraint is 70
2. in combination, a high speed shaft, a cas
exerted by the bearing to cause the shaft to rotate
ing, a bundle of nested sleeves mounted in the
about its geometrical axis and to maintain its
casing and mounting said shaft, adjacent sur
geometrical axis in alignment with the structural
faces _of sleeves of said bundle having localized
axis of the bearing. On the other hand, well
axially extending regions of contact with each
below its critical speed it will revolve about its 75 other and being separated between such regions
2,408,489
5.
of contact to provide capillary oil spaces, the re
being substantially out of radial alignment, so
- gions of contact of the inner and outer surfaces
that relative fiexures of adjacent sleeves modify
ing the thickness of said capillary oil spaces may
of each sleeve being substantially' out of radial
alignment,- so that relative fiexures of adjacent
sleeves modifying the'thickness of said capillary
` occur between their regions of contact with each
other due to pressures exerted at the regions of
contact on their non-adjacent- surfaces, means
oil spaces may occur between their regions of
Contact with each other due to pressures exerted
for supplying oil to said capillary spaces, and
at the regions of contact on their non-adjacent
means for limiting the total flexures of said
sleeves.
surfaces and means for supplying oil to said cap
6. In combination, a high. speed shaft, a cas
ing, a bundle of nested sleeves mounted in said
casing and mounting said shaft, adjacent sur
faces of sleeves` of said bundle having localized
casing and mounting said shaft, said sleeves hav
regions of contact with each other and being
ing outer surfaces provided with localized pads
arranged to engage the inner surfaces of the re 15 separated between such regions of contact to pro
vide capillary oil spaces, the regions of contact of
spective adjacent outer sleeves to provide capil
the inner and outer surfaces of each sleeve being
lary oil spaces between the pads, the pads of ad
substantially out of radial alignment, sc that rel
jacent -sleeves being substantially out of ‘radial’
ative ilexures of adjacent sleeves modifying the
alignment, so that relative ilexures of adjacent
sleeves may occur between the pads of the inner 20 thìcmess of said capillary oil spaces may occur
between their regions of contact with each other l
one of the adjacent' pair due to pressures exerted
due to pressures exerted at the regions of contact
at the pads of the outer one of the pairto modify
on their non-adjacent surfaces, means for sup
the thickness of said capillary cil spaces, and
plying oil to said capillary spaces, and means
means for supplying oil to said capillary spaces.
4. In combination, a high speed shaft, a cas 25 mounting said sleeves for simultaneous tilting
movements of said sleeves about axes perpendic
ing, a bundle of nested sleeves mounted in the
ular to thev axis of the shaft.
casing and mounting said shaft, said sleeves hav
7. In combination, a high speed shaft, a cas
ing outer-surfaces provided with localized axially
ing, a bundle of nested sleeves mounted in said
extending pads arranged to engage the inner sur
faces of the respective adjacent outer sleeves to 30 casing and mounting said shaft, adjacent sur
faces of sleeves of said bundle having localized
provide capillary oil spaces between the pads, the
regions of contact with each other and being sep
pads of adjacent sleeves being substantially out
arated between such regions of contact to provide
of radial alignment, so that'relative ñexures of
capillary oil spaces, the regions of contact of the '
adjacent sleeves may occur between Vthe pads of
the inner one of the adjacent pair due to pres 35 inner and outer surfaces of each sleeve being
substantially out of radial alignment, so that rela@
sures exerted at the pads of the outer one of »the
tive ñexures of adjacent sleeves modifying the
pair to modify the thickness of said capillary oil
illaryspaees.
`
y
_
10
3. In combination, a high speed shaft, a cas
ing, a bundle of nested sleeves mounted in the
spaces, and means for supplying oil to said cap
`-illary spaces.
thickness of said capillary oil spaces may occur v
between their regions of contact with each other
5. In combination, a high speed shaft, a cas 40 due to pressures exerted at the regions of contact
on their non-adjacent surfaces, and means for
ing, a -bundle of nested sleeves mounted in said
casing and mounting s'aid shaft, adjacent sur
faces of sleeves of said bundle having localized
regions of contact with each other and being sep
arated between such regions of contact to pro-'
vide capillary oil spaces, the regions o! contact
of the inner and outer surfaces of each sleeve
supplying oil to said capillary spaces, said means
including elements providing an oil receivingchamber-embracing the ends of said sleeves and
communicating freely with said capillary oil
spaces.
’
l
RUDOLPH BIRMANN.
'
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