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Патент USA US2117550

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May 17, 1938.
H. B. EYNON ET AL
2,117,550
SELF-LUBRI CATING BEARING
Filed May _20, 1935
ATTORNEYS
Patented May 17, 1938
' 2,117,550
/
UNITED ‘STATES \PATENT
OFFICE
2,117,550
SELF-LUBRICATING BEARING
Howard B. Eynon, and Myrtice c. Burr, St.
Marys, Pa, assignors to Pure Carbon Company,
Inc., St. Marys, Pa., a corporation of Pennsyl
vania
Application May 20, 1935, Serial No. 22,405
13 Claims. ' (Cl. coal-171)
This invention relates to bearings and more
particularly to self-lubricating bearings.
Self-lubricating bearings in which lubricant is
conducted to a bearing surface through carbon
5 or graphite elements have been used heretofore.
Bearings in which the entire bearing surface is
composed of carbonaceous material have also
been used. However, in bearings 01’ this char
‘ acter, in which. a carbonaceous material is im
l0 pregnated with oil or is supplied with oil from a
reservoir, the movable member engaged therewith
frequently becomes coated with a carbon ?lm
which, in the case where the moving'member is a
rotating shaft, tends to bind the bearing and
15 shaft.
one of the objects of the‘ present invention is
to provide a self-lubricating bearing in which the
possibility of the moving member engaged there-_
with becoming coated with a carbon film is mini
20 mized.
Another object is to provide a self-lubricating
bearing having. a lubricant reservoir with a plu
rality of spaced elements of carbon material,
capable of not only forming the sole bearing sur
525 face of the bearing, but also conducting lubricant,
without waste, to the member engaged therewith.
Another object is to provide a self-lubricating
‘ hearing ‘which is simple in construction and eco
nomical to manufacture, and which is e?icient in
30 its operation.
_
'
_
The clutch throwout collar shown in Figures 1
and 2 comprises an annular metal outer member
A having a radial portion I and spaced concen
tric circumferential ?anges 2 and an inner mem
ber B likewise having a radial portion 3 and 5
spaced concentric circumferential ?anges 4.. The
?anges 4 are of lesser depth than the ?anges 2
and the member B is nested within the member
A with the axial portions I and 3 axially spaced
so as to provide an annular reservoir 5. A ?ange 10
2 is continuously soldered or welded to the ad
jacent ?ange 4 to provide a liquid-tight connec
tion therebetween. The adjacent ?anges 2 and 4,
however, may be continuously secured together in
any other suitable manner, such for example as 15
by means of a lock seam joint. Also, the member
B may be reversed with respect to the direction
of extension of its ?anges, so that the ?anges
may extend toward the radial portion I of the
member A.
20
In the bearing of the present invention the en
tire bearing surface is composed of graphite, car- ‘
bon, or a combination of graphite with other car
bons or metals, and is in the form of a plurality of
spaced elements 6.
The individual elements 6 are sumciently porous 25
to conduct lubricant from the reservoir 5 and are
capable of reducing friction themselves in the
event the supply of lubricant becomes exhausted.
Each of the elements 6 is. formed in the shape of 30
a button having a radial shoulder 1 for engage
ment with the radial face I of the member A and
construction and combinations of partstobehere
a shank 8 of reduced diameter. The entire sur
inafter ‘described with reference to the accom
face of the elements 6, with the exception of the
35 panying drawing and then claimed.
two end faces thereof, are preferably coated with 35
In the drawing, which illustrates suitable em- _ copper.
With the above and other objects in view, the
' present invention consists in certain features of
bodiments of the invention,
.
Figure 1 is an elevation of the thrust bearing
of the present invention;
40
Fig. 2 is a transverse section taken approxi
mately on line 2-2 of Fig. 1;
Fig. 3 is an end'elevation of an annular bearing
of the present invention;
Fig. 4 is a section taken on line 4-4 of Fig. 3;
45 and
.
Figs. 5 and 6 are views similar to Fig. 2, but
1 showing modi?ed constructions.
Referring to the accompanying drawing, in
which like numerals refer to like parts through
50 out the several views, Figures 1 and 2 show the
invention in the form of a bearing such as is
used in vehicle clutches, this hearing being com—
monly known as a clutch throwout collar, and
Figures 3 and 4 show the invention in the form of
‘'5 an annular bushing.
‘ The elements 6 are assembled to the sheet metal
member A with the shank 8 extending through
openings 9 in the radial portion I of the member
A, so that the inner end faces thereof will be 40
exposed to the supply of lubricant to be contained
within the reservoir 5.
I
The radial shoulders ‘I are also engaged with
the radial face I and are soldered in place through
the medium of the copper coating to securely 45
hold the elements and form an oiltight seal
around the openings 9.
.i
The member A is formed with an opening III
in its radial outer ?ange 2, so that the reservoir
5 may be ?lled with lubricant, and the opening 50
'
III is provided with a suitable closure plug II.
Suitable collar-supporting trunnions I2 are
welded or otherwise secured thereto to form a
support for the bearing when it is used in con
nection with a clutch.
u
2,117,550
2
The annular bearing construction shown in
Figures 3 and 4 is of annular shape and com
prises outer and inner annular sheet metal mem
shown in Figure 6 may be substituted, either with
or without the wick, for the carbon element shown
in Figures 3 and 4.
bers C and D having radial portions l6 and I1
respectively, the radial portion l6 being provided
with spaced circumferential ?anges l8 and the
radial portion I‘! being provided with spaced cir
cumferential ?anges l9 ?tting within and con
tinuously secured to the ?anges IE to ‘provide a
,
v10 closed reservoir 20.
A filler opening and closure plug 2| are pro.
vided in the member D or in any other suitable
location so that the reservoir may be ?lled with
lubricant.
The bearing face as in the vpreviously described
15
construction is composed entirely of graphite,
carbon, or a combination of graphite with other
carbons or metals and is also in the form of a
plurality of spaced elements 22.
.
The elements 22 are formed with shanks 23 of
20
reduced size to provide shoulders 24. These ele
ments, which are su?iciently hard to act as a
bearing surface and su?‘lciently porous to conduct
lubricant, are assembled to the member C with the
25 shanks 22 extending into the reservoir 20 through
openings 25 formed in the radially inner ?ange
[8. The external surfaces of the elements 22,
with the exception of the end faces thereof, are
coated with copper and the shanks 23 and shoul
30 ders 24 are soldered or otherwise permanently
- secured to the radial inner ?ange I8.
As this bearing is of the annular type, the outer
faces 26 of the elements 22 are formed to an arou
ate shape to engage with the circumferential
35 surface of a shaft to be journaled therein.
In the construction shown in Figure 5 the unit
comprises the stampings A and B and is sub
stantially the same as the unit shown in Fig
ure 2, with the exception that one or more of the
bearing elements 6 is provided with a wick 30
of cotton, felt, or other suitable material which
will assist in feeding lubricant to the bearing
In each of the bearings described the bearing
surface is composed entirely of a plurality of ele
ments of carbon material which will conduct
lubricant to the elements engaged therewith,
without waste, as the exposed surfaces are'coated
with copper, which permits the passage of lubri
10
cant only to the bearing surface.
As long as there is lubricant within the reser
voir the porous bearing elements will always
serve as a means for conducting lubricant to the
bearing surfaces, and even after the lubricant
supply is exhausted will lubricate the bearing sur 15
face of the moving member for a time, because
of the lubricant contained within the bearing ele
ments.
Each of the bearing elements 6 and 22 may
have its entire surface, except the bearing con 20
tact surface, coated with copper or other suitable
material that will prevent loss of lubricant from
the external surface, and only so much of the
coating as may be necessary to properly lubri
cate the bearing surface removed from the por
25
tion of the element exposed to the lubricant. In
some instances it has been found desirable to
admit lubricant to some but not other of the bear
ing elements, because the elements lubricated
from the oil reservoir will lubricate those that do 30
not receive lubricant directly from the oil reser
voir.
The bearing elements not only form the entire
bearing surface of the hearing but also, since
they are spaced apart, act as scrapers to keep the
member which moves against the same free of
films of carbonaceous material and foreign mat
ter. This is particularly advantageous in the
case of the annular bearing, as binding of the
shaft and bearing is prevented. In solid bearings 40
of carbonaceous material the shaft frequently
binds within the bearing because of a film of car
bonaceous material which accumulates thereon.
Each of the bearing constructions described
a more positive feed of lubricant where this is
is composed of a relatively few number of parts,
4.5 desired. The wick 30 may be of considerable
length, as shown at the right in Figure 5, or it ~ which may be economically produced. Also, less
may project into the lubricant chamber 5 a short frictional resistance is obtained in the bearing
as the area of bearing contact is materially re
distance only, as shown at the left in Figure 5,
or a combination of wicks of different lengths may duced as compared to conventional solid bearings.
Although we have shown and described the
50 be used.
present invention in connection with the clutch
Also, similar bearing elements may be substi
tuted for the bearing elements 22 of Figures 3 throwout bearing and an annular bearing, its use
is not limited to such bearings. It is also to be
and e.
‘
understood that various changes in construction
In the construction shown in Figure 6 the car
may be made without departing from the spirit .;
bon element 40 is cylindrical and of uniform diam
eter from end to end and is pressed into a metallic of the invention.
surface of the carbon element and provide for
cup at of copper or other suitable metal with a
force ?t, which is provided with a ?ange $2. The
cup M with the carbon element assembled there
in is inserted in the opening in the radial por
60
tion i of the element A and the ?ange $2 is
soldered or welded to the portion l in a manner
to prevent the escape of lubricant from the reser
voir 5.
A wick 43 may also be provided in the car
65
bon element 40 to extend to the bearing surface
44 thereof and'to extend into the reservoir 5,
as shown in Figure 6. If desired, the wick 43
may be omitted and the carbon element may be
exposed to the lubricant through the opening
75
in the bottom of the cup 4|. Also, if desired,
the circumferential surface of the carbon ele
ment which projects outwardly of the vcup may
be coated with copper.
The carbon element and mounting means
What we claim is:
p
l. A self-lubricating bearing comprising a
metallic body member having a lubricant reser
voir and a plurality of apertures in a wall there
of, and a plurality of spaced bearing elements of
carbon material, said elements having their sur
faces, with the exception of the inner and outer
end faces, coated with metal, said elements hav
~ing metal coated surfaces disposed within said
apertures and being soldered to said body mem
her.
2. A self-lubricating bearing comprising a
metallic body member having a lubricant reser
voir and a plurality of apertures in a wall there
of, and a plurality of spaced bearing elements
of carbon material, said elements having their
surfaces, with the exception of the inner and
outer end faces, coated with copper, said elements
60
65
70
75
2,117,550
being disposed within said apertures and being
soldered to said body member.
3. A self~lubricating bearing comprising a
metallic body member having a sealed lubricant
reservoir therein and a plurality of apertures
through a wall thereof, and a plurality of spaced
bearing elements of carbon material, said ele
ments having their outer surfaces with the ex
ception of the inner and outer end faces thereof
10 coated with metal and having metal coated sur
faces disposed within said apertures with said
inner and faces exposed to the supply of lubri
cant in said reservoir whereby to conduct lubri
cant to said outer end faces, said outer end faces
3
coated with metal and having metal coated sur
faces disposed within said apertures with said
inner end faces exposed to the supply of lubri
cant in said reservoir whereby to conduct lubri
cant to said outer end face , said outer end faces
constituting the sole bearing surface of the bear
ing, said elements being peripherally united to
the walls of said apertures by a metal bond be
tween the metal coating‘ and metallic body, said
body comprising a pair of annular sheet metal
members, one of said sheet metal members hav 10
ing a radial portion and spaced circumferential
?anges and- the other of said sheet metal mem
15 constituting the sole bearing surface of the bear-i bers being permanently and circumferentially se
ing, said elements being peripherally united to ' cured to said ?anges, said apertures being in said 15
radial portion.
the walls of said apertures by a metal bond be
8. A selfdubricating bearing comprising a
tween the metal coating and metallic body.
4. A self-lubricating bearing comprising a metallic body member having a sealed lubricant
20 metallic body member having a sealed lubricant reservoir therein and a plurality of apertures
reservoir therein and a plurality of apertures through a wall thereof, and a plurality of spaced 20
through a wall thereof,’ and a plurality of spaced bearing elements of carbon material, said ele~
ments having their outer surfaces with the ex
bearing elements of carbon material, said ele ception
of the inner and outer end faces thereof
ments having their outer surfaces with the ex
25 ception of the inner and outer end faces thereof coated‘ with metal and having metal coated sur
faces disposed within said apertures with said 25
coated with copper and having metal coated inner
end faces exposed to the supply of lubri
surfaces disposed within said apertures with said
inner end faces exposed to the supply of lubricant cant in said reservoir whereby to conduct lubri
cant to said outer‘ end faces, said outer end faces
in said reservoir whereby to conduct lubricant to constituting
the sole bearing surface of the bear
30 said outer end faces, said outer end faces consti
ing,
said
elements
being-peripherally united to 30
tuting the sole bearing surface of the bearing, the walls of said apertures
by a metal bond be
said elements being peripherally united to the
walls'of said apertures by a metal bond between tween the metal coating and metallic body, said
body comprising a pair of annular sheet metal
the metal coating and metallic body.
members, one of said sheet metal members hav
35
5. A self-lubricating bearing comprising a me
tallic body member having .a sealed lubricant ing a radial portion and spaced circumferential 35
reservoir therein and a plurality of apertures ?anges and the other of said sheet metal mem
bers being permanently and circumferentially se
through a wall thereof, and a plurality of spaced cured
to said ?anges, said apertures being in the
bearing elements of carbon material, said ele
radially innermost of said ?anges.
40 ments having their outer surfaces with the excep
9. A self-lubricating bearing comprising a body
tion of the inner and outer end faces thereof coat
member
having a lubricant reservoir therein and 40
ed with metal and having metal coated surfaces a plurality
of spaced apertures in a wall thereof,
disposed within said apertures with said inner
and a plurality of spaced elements sealed within
end faces exposed to the supply of lubricant in said
apertures and having inner end faces ex
said reservoir whereby to conduct lubricant to posed to the supply of lubricant in said reservoir,
said outer end faces, said outer end faces con
and outer end faces, said outer end -faces being 45
stituting the sole bearing surface of the bearing, disposed
to engage a moving part and constitut
each of said elements having a circumferential < ing the sole bearing surface of the bearing, said
shoulder engaged with and united to said body elements
being of carbon material whereby to
50 circumferentially about the element containing conduct lubricant from said reservoir to said out
aperture by a metal bond between the metal
coating and metallic body.
a
6. A self-lubricating bearing comprising a me
tallic body member having a sealed lubricant res
55 ervoir therein and a plurality of apertures
through a wall thereof, and a plurality of spaced
bearing elements of carbon material, said ele
, ments havingltheir outer surfaces with the excep-'
tion of the inner and outer end faces thereof
coated with metal and being disposed within said
apertures with said inner end faces exposed to
the supply of lubricant in said reservoir whereby
to conduct lubricant to said outer end faces, said
outer end faces constituting the sole bearing sur
65 face of the bearing, each of said elements having
a metal coated circumferential shoulder engaged
with and soldered to said body circumferentially
60
' er end faces, at least one of
said elements having
50
a lubricant conducting wick therein for conduct
ing lubricant from said reservoir to the outer
end face of the said element.
10. A self-lubricating bearing comprising a
‘body member having a lubricant reservoir therein 55
and a plurality of spaced apertures in a wall
thereof, and a plurality of spaced elements sealed
within said apertures and having inner end faces
exposed to the supply of lubricant in said reser
voir, and outer end faces, said outer end faces be
ing disposed to engage a moving part and con
stituting the sole bearing surface of the bearing,
said elements being of ‘carbon material whereby
through a wall thereof, and a plurality of spaced
to conduct lubricant from said reservoir to said
outer end faces, the surfaces of said elements. 65
with the exception of said end faces, having a
coating for preventing escape of lubricant there
through, at least one of said elements having a
lubricant conducting wick therein for conducting
lubricant from said reservoir to the outer end 70
bearing elements of carbon material, said ele
ments having their outer surfaces with the ex
ception of the inner and outer end faces thereof
11-. A self-lubricating bearing comprising a
body member having a lubricant reservoir there
about the element-containing aperture.
7. A self-lubricating bearing comprising a me
tallic body member having a sealed lubricant
reservoir therein and a plurality of, apertures
face of the said element.
in and a plurality of spaced apertures in a wall
4
2,117,550
thereof, and a plurality of spaced elements sealed
within said apertures and having inner end faces
exposed to the supply of lubricant in said reser
voir, and outer end faces, said outer end faces
being disposed to engage a moving part and con
in stituting the sole bearing surface of the bearing,
said elements being of. carbon material whereby
to conduct lubricant from said reservoir to said
in
outer end faces, the surfaces of said elements
withv the exception of said end faces, having, a
coating of metal, and at least one of said elements
having a lubricant conducting wick therein for
conducting lubricant from said reservoir to the
outer end face of the said element.
12. A self-lubricating bearing comprising a
metallic body member having a lubricant reser
voir and a plurality of apertures in a wall there
of, and a plurality of spaced bearing elements of
carbon material, said elements having their sur
faces, with the exception of the inner and outer
end faces, coated with metal, said elements be
ing disposed within said apertures and being
soldered to said body member, at least one of said
elements having a lubricant conducting wick
therein for conducting lubricant from said reser
voir to the outer end face of the said element.
13. A self-lubricating bearing comprising a
metallic body member having a sealed lubricant
reservoir therein, a plurality of metallic cup
shaped elements secured to said body member
in sealed engagement and projecting into said
reservoir, and a plurality of bearing elements of
carbon material, said elements having portions
tightly ?tting within said cups with, sealed en
gagement and being exposed through said cups
to the lubricant in said reservoir and having por
tions extending from said cups», said latter por
tions having end faces constituting the sole bear
ing surface of said bearing, at least one of said
bearing elements having an oil conducting wick
embedded therein and extending into said reser
voir.
'
20
HOWARD B.’ EYNON
MYRTICE C. BURR.
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