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0a. s, 194s.
2,408,909
o. BRUMMER
ANHULAR FLUID slm.
Filed June 24. 1944
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Patented Oct. 8, 1946
2,408,909 ~
UNITED STATES PATENT OFFICE
2,408,909
ANNULAR, FLUID SEAL
Olin Brummer, Oak Park, lll.
Application June 24, 1944, Serial No. 541,870
3 Claims. (Cl. 286-11)
-
l
This invention relates to annular fluid sealing
means for relative rotatable parts especially such
as shafts and their bearings in connection with
pumps employed for the circulation of Water for
automobile engine cooling purposes, and more
particularly sealing devices of this type which do
not seal directly on the-shaft itself.
As is well known to those skilled in the art to
which my invention relates, the sealing elements
2
»but showing the sealing means compressed, parts
of the associated structure being shown in sec
tion, together with a portion of the shaft which
passes therethrough;
Figure 4 is an enlarged fragmentary sectional
view corresponding to one corner of the structure
of Figure 2, that is the upper left-hand corner
as shown in the view, enlarged for purposes of-`
a more detailed description in accordance With
are the parts which are most likely to fail in
operation under variations from the normal which 10 the present invention;
Figure 5 is an end view, again on the scale of
are frequently likely to occur, particularly in mo
Figures 2 and 3, of the rubber-like body of the
tor vehicles where perfect operation under both
sealing means; and
normal and stress conditions is highly essential.
Figure 6 is a side elevational view of said body
Among other objects, the present invention aims 15
and :being the view thereof shown in Figure 1 with
to provide such a seal which is markedly free from
the metal spring omitted.
objections to prior constructions, which can be
readily placed in position quickly by inexperienced
maintenance operatives without danger of being
incorrectly inserted, and which has enhanced
characteristics of longevity, sturdiness, and seal
ing qualities.
Referring in detail to the illustrative construc
tion shown in the drawing, the numeral I0 may
i. represent a portion of the engine block of an ln- -
ternal combustion engine which may be jacketed
as by the passage II therein for the circulation
of a cooling fluid, such as, water or the like. The
The invention will be exemplified as applied to
pump casing I2 may be secured to engine block
one illustrative form of water pump of an internal
combustion engine and adapted to substantially 25 I0 as «by the usual bolts I3, only one of which
is here shown, with the usual gasket I4 therebe
yeliminate leakage of water from the water jacket
tween, the pump casing having an orifice I5 which
and its associate passages which might otherwise
may communicate with the radiator of the power
ñnd its way into the bearing of the pump drive
plant. Extending through the pump casing I2 is
shaft and not only cause loss of cooling fluid but
a rotatable shaft I6 rotatable in a bearing mem
result in destroying the lubrication of the shaft,
this leakage prevention being accomplished while 30 :ber I1 carried by the casing. Secured on the
shaft I6 to rotate therewith is the usual impeller
at the same time permitting yielding movements
I8 having blades I9 which revolve in an enlarge
of the shaft either eccentrically or longitudinally
ment 20 of the water-jacket passage II to cause
without disturbing the sealing action, the seal
the water to circulate therein from and to the
readily contracting or expanding to accommodate
itself to such movement, as well as Wear of the
parts, without danger of distortion or failure.
An important aspect of the present invention
V radiator. The impeller I8 may be secured to shaft
I6 as by a press fit of its hub I8a thereon. At
the other end of the shaft I6 is secured, to ro`-tate with the shaft, a pulley 2| to take the drive
belt of the pump. The pulley 2I may be secured
degree of collapsibility while still being resilient
and which is accomplished by a. novel combined 40 to the pump drive shaft I 6 also by a press flt
of its hub 2 Ia thereon, as is well known in the art.
telescoping and diaphragm action of the rubber
is the provision of a seal device having a high
like part.
So as to prevent or at least minimize the en
trance of water into the .bearing surface between
These and other objects of the invention will
the shaft I6 and its bearing member I'I, an annu
more fully appear from the following specifica
tion, taken together with the accompanying draw 45 lar seal indicated generally by the numeral 22
is provided, the seal in this instance seating at
ing, in which
one end against the surface 23 of the impeller
Figure 1 is a sectional view through an illus
hub I8a, and at its other end against the usual
trative pump construction showing in elevation
friction disk or washer 24 which may be of carbon
my improved sealing means associated there
50 or of a phenolic condensation material impreg
with;
nated with graphite or other self-lubricating sub
Figure 2 is an axial sectional view through my
stance,
as is well known and need not be here
improved sealing means shown in Figure 1, the
further described. In this instance the Washer
sealing means being uncompressed;
,24 is keyed to the impeller I8 as by radial tongues
Figure 3 is a view somewhat similar to Figure 2
55 25 on the washer which are received in slots 26
2,408,909
4
this corner, as clearly shown in my drawing. is a
square, sharp corner, and similarly, the corner
in the impeller, the impeller I9, seal 22, and
washer 24, thus all rotating with the shaft I3.
'I‘he coil spring 21 is inserted between the enlarged
face ends of the seal 22 and tends to expand the
seal axially, while, through the intermediation
of the seal, pressing the washer.“ against the
cylindrical portion 28 of the pump casing I2 which
carries the bearing I1. Since the seal 22 and its
'associated spring 21 are normally maintained un
der some compression at all times (this being 10
effected by the initial press-ñt assembly of the
pulley 2| with the shaft I6), the seal 22 thus Í
closes oil’ the space between the washer 24 and
the impeller surface 23 while the rotative close
frictional abutment of the washer 24 with the 15
portion 29 seals this point and prevents water
from reaching the bearing I1. To prevent acci
C1.
dental disengagements of part.. just described
between 33 and 29 is square and sharp, thus in
creasing the thickness of the material at these _
corners.
When, now, the-seal is further compressed, as
for example, by an axial movement of the shaft
I6 toward the left in Figure l under stresses of
operation of the pump, the smaller space afforded
for the seal between the washer 24 and the im
peller surface 23 is accommodated not only by
compression of the spring 21 but also by con
traction of the seal 22 somewhat as indicated in
Figure 3, the connecting parts 3| of the seal body
ñexing axially with the axial movement toward
each other of the face parts 30, and the tube part
29 remaining relatively uncompressed. Con
versely, when the shaft |6 moves to the right in
Figure l and more space is afforded between the
from the impeller, a removable spring ring 25b
washer 24 andthe impeller` surface 23, the seal
is seated in a groove 25a in the impeller ilngers 20 body tends to return under its own resilience (as
|9b which however does not interfere with ex
well as the action of the spring 21) to the posi
pansion and contraction of the seal in use.
tion indicated in Figure 2 in which the portions
The present invention being directed to im
32 and 33 of the connecting part 3| are again
provements in the seal 22, attention will now be
at right angles, instead of forming an acute angle
directed in detail to the latter, which in accord 25 as in the compressed position indicated in Fig
ance with the present invention, comprises an
ure 3.
k.
annular body 22a of ilexible, resilient rubber-like
In the expansion of the seal to accommodate a
or elastic material (for example, natural rubber
larger space therefor as last indicated, the coil
or preferably a synthetic elastomer of which sev
spring 21 of course assists in a speeded and cer
eral are now on the market) which does not 30 tain return of the seal body to expanded posi
deteriorate or lose its elastic properties due to
tion, the spring 21 bearing against the inner
heat, cold, moisture or the material with which
laces of the face parts 30 of the seal body and
it comes in contact and which may be cast or
tending to press these apart while leaving the
molded, in a manner well known to the art and
tube 29 of the seal entirely free of the spring and
35
which need not be here described, to the form
connected to the face parts only by the flexible
here shown, for example, following the present
but resilient and elastic connecting parts 3 I. The
invention.
spring 21 is advantageously centered by the
As here shown, the body 22a of the seal 22 is
shoulder provided between the parts 30 and 32.
reel-like in form and comprises a sleeve or tube In both contraction and expansion of the seal,
part 29 which is located centrally of the seal, a
the flange-like radially ‘extending annular por
face part 3U in'this instance at each end of the
tion 33 of the seal body 22a desirably acts some
seal, and a connecting part 3| between and
what as a diaphragm responding rapidly and pos
connecting the tube partvand the face parts, the
_ itively to the required movements.
face parts being of larger diameter than the tube
So constructed and arranged each face part
part, and the connecting parts of reduced diam
eter with respect to the face parts but again of
larger diameter than the tube part.
o 30 presents to the element which it abuts, as for
example, the washer 24 or impeller surface 23,
an annular area 34, as best shown in Figure 5.
As best shown in Figure 4, the connecting part
which is of larger diameter, both for its internal
3| is of angular cross-section comprising a cylin
and external diameter, than the tube part 29, and
drical axially extending portion 32 energing from 50 it is against this area 34 which the spring presses,
the face part and co-axial with the tube part 29
the ñnal coils of the spring at each end being
and an annular radially extending flange-like
also in the form of an annulus and desirably
portion 33 'in a plane transverse to the axis of
ñattened as at 21a where it presses against the
the tube and merging into the tube part. Fur
face part 30 as at 30a.
thermore, the tube part 29, as best seen in Figure
The spring 21 presses the face part 39 against
4 is of a cross-sectional wall thickness mate
the element with which it abuts desirably through
rially greater than that of the cross-sectional
the intermediation of concentrically annular ribs
wall thickness of the connecting part 3|. In ex
35 and 36 on the annular area 34, thus providing
pansion and contraction of the seal, the face
a suction grove therebetween and enhancing the
parts, while remaining substantially parallel, 60 sealing
effect of the body to effect a fluid-tight
move with the connecting parts which tend to
seal. The body 22a is thus counterbored as at 31
pivot so to speak where the latter merge into the
and the effective cooperation between the spring
tube part as at 29h. The cross-sectional thick
21 and the body 22a and between the latter and
ness of the face part 39 is preferably somewhat , the element against which it abuts, such as the
O
Gl
greater than that of the connecting part 3| but
washer 24 or impeller surface 23 is enhanced, the
slightly less than that of the Atube part 29. For
sealing action taking place adjacent the periph
example, following the present invention, the
ery of the seal where it is most effective.
cross-sectional thicknesses of these respective
The tube part 29 of the seal body may thus
parts are advantageously, say, as follows: .050 of
encircle the shaft i6 < as indicated in Figure 3 at
70
an inch for the face part, .030 of an inch for the
29a where is provided a bore for the shaft) at all
connecting part, and .065 of an inch for the tube
times during both expansion or contraction of
part, substantially as illustrated in Figure 4, at
the seal and remaining relatively undistorted
“A,” “B” and “C” respectively. The distance
from its substantially tubular form throughout
across the corner at the junction between 32 and
33 is proportionally greater than .030 inch, since 75 the operation of the seal in any normal expansion
2,408,909
or contraction thereof, telescoping into the coun
terbores 31 at each end during compression of
the seal, while free to flex when required.
I have found that a seal constructed in ac
cordance with this invention has marked eil'ec
tiveness and freedom from failure over indefi
nite periods of operation and under both normal
and abnormal conditions. 'I'he thickened tube
part for the seal tends to stabilize its structure
and operation, while the connecting parts oi'
sharply angular cross-section permit the face part
of the seal and the tube part of the seal to act
independently, each performing its respective
functions without interference from the other,
said ñexing movements, and further diametri
cally enlarged annular face-parts extending radi
ally outwardly from the axial extensions respec
tively, said ilange portions extending outwardly a
suiliclent distance and said axial extensions be
ing of suñlcient internal diameter whereby the
tubular part telescopes at each end into said
counterbores during compression of the seal.
2.~ An annular fluid seal comprising a body of
rubber-like material having a central tubular
part, annular diaphragm-like flange portions ex
tending radially outwardly from each end respec
tively of said tubular part, the tubular part
these functions being in each case materially 15 having a wall of substantially uniform cross-sec
tion oi' a thickness approximately twice the cross
diil'erent, while all at the same time cooperating
sectional thickness of said flange portions, said
in enhanced improvement in results of the seal
as a whole.
flange portions flexing axially toward and away
from each other pivoting on said tubular part
It is to be understood that the function of the
in
compression and expansion of the device, a
tube part 29 does not depend on any sealing ac 20
cylindrical axial extension of each said ilange
tion between the tube part and the shaft at 29a
portion extending axially outwardly of the flange
but that this is largely by way of stabilizing of
portions at each end, said cylindrical axial ex~
the seal.
tensions also moving axially toward and away
'I'he connecting part 3| is flexible and some
what elastic but not so flexible or elastic as 'to 25 from each other with movement of said flange
portions, said flange portions and axial exten
be inert but on the contrary has substantial re
sions forming a counterbore at each end of the
silience so as to cooperate in returning the face
seal, the corner between each flange portion and
parts to extended position, so that the seal of the
its respective axial extension being substantially
present invention does not rely entirely or even
square and sharp whereby the cross-sectional
to any principal degree upon the spring 21 to
30 thickness diagonally across said corner is greater
cause 1t to expand when it is permitted to do so
than the cross-sectional thickness of said ilange
to take up a, greater space afforded and to main
portion, and further diametrically enlarged an
tain the effectiveness of the seal.
nular face parts extending radially outwardly
In the present invention in which there is a
progressive reduction oi' the diameter of the seal 35 from the axial extensions respectively, said flange
from the face part, through the connecting part,
to the tube part, radial expansion of the parts
portions extending outwardly a suiïlcient dis
tance and said cylindrical extensions being oi’
suilicient internal diameter whereby the tubular
is substantially eliminated and the axial move
part telescopes at each end into said counter
ments of the parts is in complete harmony and
bores during compression of the- device.
consonance with the axial movement of the shaft 40
3. An annular fluid seal device comprising, a
and the axial movements of the cooperating
body of rubber-like material having a central
spring, thus preventing slight variations in the
tubular part of substantially uniform wall cross
molding of the seal from ail'ecting its operation.
section, annular diaphragm-like flange portions
Moreover, since the parts are not intended to
extending radially outwardly from each end re
fold upon each other, the effects of sediment or
spectively of said tubular part, said ñange por
grit in the water upon the seal are obviated, and
tions iiexing axially toward and away from each
the moving parts of the seal are at all times clear
other on said tubular part in compression and
of each other.
expansion of the device, a, cylindrical axial exten
'I'he invention is capable of such embodiments
sion of each said flange portion extending axially
as fall within the scope of the appended claims. 50 outwardly of the flange portions at each end,
Having described my invention, I claim:
1. An annular ñuid seal comprising a body of
rubber-like material having a central tubular
said cylindrical axial extensions also moving axi
ally toward and away from each other with
movement oi' said flange portions, said flange por
part, annular diaphragm-like flange portions ex
tions and axial extensions forming a counter
tending radially outwardly i'rom each end respec 55 bore at each end of the device, the corner be
tively oi.' said tubular part, said flange portions
tween each‘ñange portion and its respective
iiexing axially toward and away from each other
axial extension being substantially square and
pivoting on said tubular part in compression and
sharp whereby the cross-sectional thickness diag
expansion of the seal, a cylindrical axial exten
onally across said corner is greater than the
sion of each said flange portion extending axi 60 cross-sectional thickness of said ñange portion,
ally outwardly of the flange portions at each
and further diametrically enlarged annular face
end, said axial extensions moving axially to
parts extending radially outwardly from the axial
extensions respectively. said flange portions ex
of said flange portions, said flange portions and
tending outwardly a sufficient distance and said
axial extensions forming a counterbore at each 65 cylindrical extensions being of suflicient internal
end of the seal, the corner between each flange
diameter whereby the tubular part telescopes at
portion and its respective axial extension being
each end into said counterbores during compres
ward and away from each other with movement
suiliciently sharp whereby the ilange portions
maintain substantially flange form throughout
sion of the device.
OLIN BRUMMER.
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