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Патент USA US3053202

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Sept. 11, 1962
e. NONNENMACHER
BEARING ARRANGEMENT FOR A HYDRAULIC MACHINE
Filed Feb . 28,
3,053,192
' ice
brad
3,053,192
Patented Sept. 11, 1962
2
bearing portion and the shaft, but the ?uid pressure of
3,053,192
Gerhard Nonnenmacher, Korntal, Germany, assignor to
Robert Bosch Gmblh, Stuttgart, Germany
the pressure area on the bearing surface reduces the pres
sure between the shaft and the bearing surface so that a
lubricating ?lm can be formed on the shaft by liquid pass
ing from the high pressure chamber to the pressure area
Filed Feb. 28, 1961, Ser. No. Q2383
on the bearing surface of the displaceable bearing portion.
BEARING
ANGEMENT FOR A
HYDRAULIC MAC
Claims priority, application Germany Mar. 1, 1960
15 Claims. (Cl. 103-126)
In one embodiment of the invention, the pressure area
is formed by a recessed surface portion which is supplied
with a liquid through a narrow throttling passage. In
The present invention relates to a bearing arrange 10 another embodiment of the present invention, a wide
ment for a hydraulic machine and more particularly to
passage opens on the bearing surface of the displaceable
a hydraulic pump or motor of the type in which two mesh
bearing portion in a port which forms the pressure area.
ing gears form a high-pressure chamber and a low-pres
The other end of the Wide passage is closed by a resilient
sure chamber in a housing.
closure which, under the pressure prevailing in the pas
Since the highapressure chamber produces a higher ' sage, is urged against the inner surface of the housing
pressure on the meshing gears than the low-pressure
whereby the displaceable bearing portion is displaced to
chamber, the gears, and the shafts thereof, are displaced
hold the shaft in the desired position.
in a transverse direction, and it is known to provide the
The pressure ?elds are advantageously sealed by an
bearings of hydraulic machines of this type with dis
nular sealing rings mounted in recesses of the outer sur
placeable bearing portions which are subjected to ?uid
face of the displaceable bearing portion. In one embodi
pressure to urge the shafts, and thereby the gears against
ment of the invention, pressure ?uid is supplied to the
the pressure of the high-pressure chamber into a desired
recess so that the sealing ring is urged against the inner
position in which the teeth of the meshing gears slide
surface of the casing, while another passage connects
on the inner surfaces of the casing in the region of the
the recess with the center of the pressure ?eld.
high-pressure chamber to prevent losses.
25
The novel features which are considered as character
However, hydraulic machines of this type have the
istic for the invention are set forth in particular in the
disadvantage that under certain operational conditions,
appended claims. The invention itself, however, both
very high friction is developed between the shafts and
the bearing. Particularly, if the hydraulic machine is
as to its construction and its method of operation, to
gether with additional objects and advantages thereof,
used as a motor, the pressure of the liquid supplied to 30 will be best understood from the following description of
the high-pressure chamber is directly transmitted to the
pressure means which urge the displaceable bearing por
tions against the shaft before a lubricating ?lm can ‘be
speci?c embodiments when read in connection with the
accompanying drawings, in whic :
FIG. 1 is a perspective view, partly in section, illustrat
ing a hydraulic machine according to the present in
formed on the same, so that the gears have to overcome
very high friction at the start of the operation.
It is one object of the present invention to overcome
" vention;
FIG. 2 is a cross-sectional view of a bearing body ac
the disadvantages of known hydraulic machines of this
cording to the present invention; and
type, and to provide a bearing arrangement for a hydraulic
FIG. 3 is a cross-sectional View illustrating a bearing
machine which assures sufficient lubrication of the bear
body according to a modi?ed embodiment of the invention.
40
ings and shafts under all operational conditions.
Referring now to the drawings, the hydraulic machine,
Another object of the present invention is to provide
for example a hydraulic motor, has a housing 1 with a hol
in a hydraulic machine of this type, a pressure area be
low interior 2 having a cross-section matching the outline
tween a bearing surface and a shaft, and to establish com
of bearing bodies 8 and 9 which may be constructed as
munication between the high—pressure chamber and the
shown in FIG. 2 or FIG. 3. Two meshing gears 4 and 5
pressure area so that the pressure between the shaft and 45 are located between the bearing bodies 8 and 9 and com
the bearing surface is reduced.
Another object of the present invention is to provide
municate with an opening 10 through which liquid is dis~
charged if the hydraulic machine is used as a motor. A
a hydraulic motor in which a lubricating ?lm is formed
corresponding opening for a liquid under pressure is pro
vided on the other side of the housing, and communicates
between the bearings and the shafts by a liquid supplied
under pressure to the inlet of the motor.
With these objects in view, the present invention relates
to a hydraulic machine which comprises a housing, a
50
with a high-pressure chamber formed by the meshing gears
in the housing, such high-pressure chamber vcorresponding
in shape to the low-pressure chamber 11 which is located
adjacent the opening 10. The gears have shaft portions 6
pressure chamber and a low pressure chamber in the
and 7, respectively projecting in opposite directions from
housing, and bearing means in the housing for support 55 the gears into the bearing bores 15 and 16 of the bearing
ing the shafts and having a displaceable bean'ng portion.
bodies 8 and 9. One of the shafts 6 is extended to project
pair of meshing gears having shafts and forming a high
The bearing means includes pressure means on the outer
out of the housing to be connected to a driven apparatus,
surface of the bearing portion, for example, a pressure
?eld communicating with the high pressure chamber. The
if the machine serves as a motor, or to be connected to a
prime mover, if the machine serves as a pump. An end
bearing portion has a pressure area on its bearing sur
face and is formed with a passage in communication with
sealing being provided for sealing the bore through which
the high pressure chamber.
The pressure differential between the high pressure
chamber and the low-pressure chamber urges the gears
plate 3 on housing 1 closes the same ?uid-tight, suitable
the shaft 6 passes.
Assuming that the machine is operated as a motor, it
will be understood by those skilled in the art that the
and shafts in a direction transverse to the axes thereof 65 liquid admitted through the high-pressure chamber in the
bight between gears 4 and 5 will effect turning movement
away from the high pressure chamber, and the pressure
?eld on the outer surface of each bearing portion urges
of the meshing gears while being transported between the
the bearing portion against the respective shaft so that
gear teeth to the low-pressure chamber 11 to be ?nally
the same is held in its proper position against the pres
sure of the high pressure chamber. High friction tends
to develop between the inner bearing surface of the
discharged through the outlet 10.
Each bearing body 8 and 9 has an inner face abutting
the lateral faces of the gears 4 and 5, and anouter face
formed with a pressure ?eld .13 surrounded by a sealing
3,053,192
3
means 12 of annular shape. Passages 14 pass in axial di
rection through the bearing bodies and connect the pres
sure ?elds ‘12 with the pressure chamber formed by the
meshing gears adjacent the inlet of housing 1. Due to the
pressure of the pressure ?elds .13, the bearing bodies 8
and 9 are urged toward each other and into sealing contact
with gears 4 and 5.
Referring ?rst to the embodiment of FIG. 2, the bearing
body has a central passage 27 connecting passage 14 with
a chamber v28 which is closed by a plug 31. Chamber 28
is connected by passages 29 and 30 to a pair of circular
recesses in which sealing rings 25 are mounted. Bores 29a
4
than the pressure exerted by the high pressure chamber
on the gears, and thereby on the shafts so that the shafts
remain in contact with the bearing surfaces of the dis
placeable bearing portions 19 and 20.
The projecting plug 31 on the low-pressure side of the
bearing body supports the same on the inner surface of the
housing in the event that liquid under pressure passes from
the
the
ing
ing
high-pressure chamber between the inner surface of
housing and the outer surface of the respective bear
body. In this manner, all forces acting on the bear
bodies are substantially balanced.
In the event that the pressure of the pressure areas 34
and 35 exceeds the bearing pressure acting in oppo
site direction, the shafts will have a tendency to move
of the bearing bodies which are surrounded by sealing
rings 25 and 26. Since the pressure of the pressure cham 15 away from the bearing surfaces of the bearing portions
19 and 20. This may occur if due to unusual operational
ber adjacent the inlet of the motor is transmitted by the
conditions, the ?uid pressure of the supplied liquid sub
liquid through passages 14, 27, chamber 28, passage 29
stantially fluctuates. In this event, the pressure of the
and 29a to the area surrounded by the sealing rings 25 and
pressure areas 34 and 35 drops rapidly, since passages
26, pressure ?elds are created which act between the inner
32 and 33 are very narrow and act as throttles, permitting
surface of the housing 1 and ‘bearing portions 19 and '20
the shafts to return to the desired position sliding on the
de?ned by slots 17, 21 and 18, 22.
‘bearing surfaces of bearing portions 19 and 20. In this
Since only a thin portion remains between slots 21, 22
manner, liquid losses which would reduce the efficiency
and bearing bores 15 and 16, portions 19 and 20 are resil
of the machine, are prevented.
iently displaceable under the fluid pressure acting on the
It is, however, not absolutely necessary to provide
25
pressure ?elds 23 and 24.
throttling ducts for supplying pressure liquid to the pres
The inner bearing surfaces of bearing portions 19 and
sure areas. In the modi?ed embodiment of FIG. 3, the
20 have recessed surface portions 34 and 35 which are
bearing bodies are again provided with bearing bores 15
connected by passages 32 and 33 to the center portions of
and 16, and have resiliently displaceable bearing portions
the pressure ?elds 23 and 24. Since liquid under pressure
passes through passages ‘32 and 33 to the recessed surface 30 19 and 2d. The pressure areas on the bearing surfaces of
bearing portions 19 and 20 are constituted by ‘the ports
portions 34 and 35, pressure areas are created in the re
of wide cylindrical passages 36 and 37 whose outer ends
cessed surface portions 34 and 35 so that ?uid pressure is
and 30a connect the recesses with the areas on the surface
38 and 39 are stepped and of greater diameter to cover
an area corresponding to the pressure ?elds 23 and 24 in
structed and dimensioned that the ?uid pressure therein 35 the embodiment of FIG. 2. Passages 36 and 3-7 are closed
by the resilient closure means in the form of ‘resilient caps
exerts on the shaft a force smaller than the force by which
40 and 41 Whose inner ?anges are seated on the shoulders
the shafts are pressed against the dis-placeable bearing por
42 and 43. Passages 44 and ‘45 open into the passages 36
tions 19 and 20 by the ?uid in the high-pressure chamber
and 37 ‘and communicate through chamber 28 with the
which acts on the gears, and thereby on the shafts. Con
sequently, the shafts are in sliding engagement with the 40 pressure chamber of the machine, so that the resilient
exerted on the shafts in bearing bores Y15 and 16.
The pressure areas 34 and 35 are so arranged, con
inner bearing surfaces of the displaceable bearing portions
19 and 20.
caps 40 and 41 are pressed by the ?uid pressure against
the inner surface of the housing to urge the bearing por
During operation of the hydraulic machine as a motor,
tions 19 and 20 inwardly in radial direction, in the same
manner in which the bearing portions are inwardly urged
a liquid under pressure is introduced into the pressure
chamber through an inlet, not visible in FIG. 1, and the 45 by the pressure ?elds 23 ‘and 24 in the embodiment of
pressure of the liquid will urge portions of the gears 4 and
FIG. 2.
.
5 against the inner surface v2a of the housing. Since at the
The bearing body shown in FIG. 3 can be adapted to
start of the motor there is no liquid yet in the spaces "be
correspond to the embodiment of FIG. 2. It is only
tween the teeth of the gears, very high friction would de
‘necessary to remove the caps 40 and 41, to place sealing
velop between the gears and the surface 2a. However, 50 rings on the shoulders 42 and 43, and to secure inserts in
the pressure ?uid in the pressure chamber passes through
passages 36 and 37, such inserts being formed with
the passages 14, 27, 28, 29, and 29a to the pressure ?elds
narrow throttling passages corresponding to passages 32
23 and 24 so that the displaceable portions 19 and 20 are
and 33.
pressed in radial inward direction to press against the
In the event that the machine is used as a pump, open
shaft in a direction which is opposite to the direction in 55 ing 10 is no longer an outlet, but serves as an inlet. The
which the gears 4 and 5 are pressed ‘by the ?uid in the
pressure conditions remain the same, since the chamber
pressure chamber. Consequently, the gear teeth slidably
11 of a pump adjacent the inlet is the low-pressure cham
engage the inner surface 2a of the housing adjacent the
ber, while the chamber on the other side is the high
pressure chamber.
‘
pressure chamber through which the liquid is discharged
A substantial pressure develops between the inner sur 60 into the outlet, not shown.
faces of the bearing portions 19 and 20 and the shafts.
The bearing bodies 8 and 9 have been described to be
However, liquid under pressure passes through the pas
integral, but it will be understood that each bearing body
sages 32 and 33 from the pressure ?elds 23 and 24 to the
pressure areas 34 and 35 so that the ?uid pressure between
includes two Ibearing means for the two shafts, respec
tively, and that such bearing means are not necessarily
integral, but can be connected to each other by suitable
the bearing surfaces of bearing portions 19 and 20 and the
shafts is sufficiently high to eliminate any friction between
the surfaces.
The mechanical friction is substantially reduced, and
means.
It will be understood that each of the elements described
above, or two or more together, may also ?nd a useful
the liquid spreads from pressure areas 34 and 35 around
application in other types of hydraulic pumps or motors
the shafts so that the pressure ?uid in the highepressure 70 differing from the types described above.
chamber has only a small resistance to overcome. Conse
While the invention has been illustrated and described
quently, the motor can ‘be started even under a load torque
as embodied in a bearing arrangement for a hydraulic
machine including means for supplying ?uid under high
acting on a projecting portion of shaft 6.
pressure to the bearing surfaces, it is not intended to be
The ?uid pressure exerted by the pressure areas 34 and
35 on the shafts, and ‘thereby on the gears, must be smaller 75 limited to the details shown, since various modi?cations
5
3,053,192
and structural changes may be made Without departing in
any way from the spirit of the present invention.
terior a high pressure chamber and a low pressure cham
ber whereby said gears and shafts are urged in a direction
transverse to said axes away from said high pressure cham
ber; ?rst and second bearing means located in said hous
Without further analysis, the foregoing will so fully
reveal the gist of the present invention that others can
by applying current knowledge readily adapt it for Various
applications without omitting features that, from the
standpoint of prior art, fairly constitute essential charac—
ing on opposite sides of said gears for supporting the ends
of both said shafts, respectively, each bearing means hav
ing a bearing portion displaceable substantially in said
teristics of the generic or speci?c aspects of this invention
transverse direction and having an outer peripheral sur
and, therefore, such adaptations should and are intended
face located in said interior of said housing, and an inner
to be comprehended within the meaning and range of 10 bearing surface for rotatably supporting the respective
equivalence of the following claims.
shaft, each bearing means including pressure means on
What is claimed as new and desired to be secured by
said
outer surface connected with said high pressure cham
Letters Patent is:
ber so that the pressure of said pressure means sustains
1. In a hydraulic machine, in combination, a housing
said bearing portion and thereby the respective shaft in
having a hollow interior and an inlet and an outlet; a pair
radial direction against the pressure of said pressure cham
of meshing gears having shafts with parallel axes and be
ber, each bearing means having a pressure area on said
ing disposed in said housing to form in said hollow inte
bearing surface of said bearing portion thereof and be
rior a high pressure chamber and a low pressure chamber
whereby said gears and shafts are urged in a direction
transverse to said axes away from said high pressure cham
ing formed with a passage in communication with said
high pressure chamber, said pressure means and pressure
areas being located substantially diametrically opposite
ber; ?rst and second bearing means located in said hous
ing on opposite sides of said gears for supporting the ends
of both said shafts, respectively, each bearing means hav
to said high pressure chamber so that the eifect of the
pressure on the outer surface of the bearing means to
counteract the force of the pressure in the high pressure
chamber on said shafts is reduced by the high pressure act
transverse direction and having an outer peripheral sur 25 ing in said pressure area, said pressure means and said
face located in said interior of said housing, and an inner
pressure area and passage being constructed and arranged
ing a bearing portion displaceable substantially in said
bearing surface for rotatably supporting the respective
so that the pressure exerted by said pressure area on said
shaft, each bearing means including pressure means on
shaft is smaller than the pressure exerted by said bearing
said outer surface connected with said high pressure cham
portion on said shaft under the force of said pressure
ber so that the pressure of said pressure means sustains 30 means.
said bearing portion and thereby the respective shaft in
4. In a hydraulic machine, in combination, ‘a housing
radial direction against the pressure of said pressure cham
ber, each bearing means having a pressure area on said
having a hollow interior and an inlet and an outlet; a pair
of meshing gears having shafts with parallel axes and be
bearing surface of said bearing portion thereof and being
ing disposed in said housing to form in said hollow inte
formed with a passage in communication with said high 35 rior a high pressure chamber and a low pressure chamber
pressure chamber, said pressure means and pressure areas
whereby said gears and shafts are urged in -a direction
being located substantially diametrically opposite to said
transverse to said taxes away from said high pressure cham
high pressure chamber so that the effect of the pressure on
ber; ?rst and second bearing means located in said housing
the outer surface of the bearing means to counteract the
on opposite sides of said gears for supporting the ends of
force of the pressure in the high pressure chamber on said 40 both said shafts, respectively, each ‘bearing means having
shafts is reduced by the high pressure acting in said pres
a bearing portion displaceable substantially in said trans
sure area.
verse direction and having an outer peripheral surface lo
2. In a hydraulic machine, in combination, a housing
cated in said interior of said housing, and an inner hear
having a hollow interior and an inlet and an outlet; a
pair of meshing gears having shafts with parallel axes ‘and
being disposed in said housing to form in said hollow
ing surface for rotatably supporting the respective shaft,
* each bearing means having a pressure ?eld on said outer
interior a high pressure chamber and a low pressure cham
ber whereby said gears and shafts are urged in a direction
transverse to said axes away from said high pressure cham
surface ‘connected with said high pressure chamber so that
the pressure of said pressure ?eld sustains said bearing
portion and thereby the respective shaft in radial direction
against the pressure of said pressure chamber, each bear
ber; ?rst and second bearing means located in said housing
on opposite sides of said gears for supporting the ends of
both said shafts, respectively, each bearing means having
a bearing portion displaceable substantially in said trans
verse direction and having an outer peripheral surface lo
cated in said interior of said housing, and an inner bearing 55
pressure chamber so that the e?Fect of the pressure on the
bearing means having a pressure ?eld on said outer sur
outer surface of the bearing means to counteract the force
of the pressure in the high pressure chamber on said shafts
surface for rotatably supporting the respective shaft, each
face connected with said high pressure chamber so that
the pressure of said pressure ?eld sustains said bearing
ing means having a pressure area on said bearing surface
of said bearing portion thereof and being formed with a
passage extending between said pressure ?eld and said
pressure area, said pressure ?elds and pressure areas being
located substantially diametrically opposite to said high
is reduced by the high pressure acting in said pressure
area, said pressure ?eld and said pressure area and pas
portion and thereby the respective shaft in radial direc 60 sage being constructed and arranged so that the pressure
tion against the pressure of ‘said pressure chamber, each
exerted by said pressure area on said shaft is smaller than
bearing means having a pressure area on said bearing sur
the pressure exerted by said bearing portion on said shaft
face of said bearing portion thereof and being formed with
a passage extending between said pressure ?eld and said
pressure area, said pressure ?elds and pressure areas be
ing ‘located substantially diametrically opposite to said
high pressure chamber so that the effect of the pressure
on the outer surface of the bearing means to counteract
the force of the pressure in the high pressure chamber on
under the force of said pressure ?eld.
5. In a hydraulic machine, in combination, a housingv
having a hollow interior and an inlet and an outlet; a
pair of meshing gears having shafts with parallel axes
and ‘being disposed in said housing to form in said hollow
interior a high pressure chamber and a lower pressure
chamber whereby said gears and shafts are urged in a
said shafts is reduced by the high pressure acting in said 70 direction transverse to said axes away from said high
pressure area.
pressure chamber; ?rst and second bearing means located
3. In a hydraulic machine, in combination, a housing
in said housing on opposite sides of said gears for sup
having a hollow interior and an inlet and an outlet; a pair
porting the ends of both said shafts, respectively, each
of meshing gears having shafts with parallel axes and
bearing means having 1a bearing portion displaceable
being ‘disposed in said housing to form in said hollow in 75 substantially in said transverse direction and having an‘
aosaroa
7
8
a pressure area on said bearing surface of said bearing
outer peripheral surface located in said interior of said
portion thereof and being formed with a passage in com
housing, and an inner bearing surface for rotatably sup
munication with said high pressure chamber, said pressure
porting the respective shaft, each bearing means having a
means and pressure areas being located substantially dia
pressure ?eld on said outer surface connected with said
high pressure chamber so that the pressure of said pres 5 metrically opposite to said high pressure chamber so that
the effect of the pressure on the outer surface of the
sure ?eld sustains said bearing portion and thereby the
bearing means to counteract the force of the pressure
respective shaft in radial direction against the pressure
in the high pressure chamber on said shafts is reduced
of said pressure chamber, each bearing means having
by the high pressure acting in said pressure area, said
a pressure area on said bearing surface of said bearing
portion thereof and being formed with a passage extend 10 passage opening on said ‘bearing surface in a port con
stituting said pressure area, said pressure means being
ing between said pressure ?eld and said pressure area,
a resilient closure member located in said passage in
said pressure ?elds and pressure areas being located
the region of said outer surface and being urged by the
substantially diametrically opposite to said high pressure
pressure in said passage against said housing.
chamber so that the effect of the pressure on the outer
8. A hydraulic machine as set forth in claim 7 wherein
surface of the Ibearing means to counteract the force
each passage is stepped and has an inner passage portion
of the pres-sure in the high pressure chamber on said
of smaller diameter having said port at the inner end
shafts is reduced by the high pressure acting in said
thereof, and an outer passage portion of greater diameter
pressure area, said passage having a selected small cross
in the region of said outer surface; and wherein said
section to throttle the ?ow of a liquid therethrough, said
pressure ?eld and said pressure area and passage being 20 resilient closure member is a resilient cap seated in said
outer passage portion and having an outer surface ?ush
constructed and arranged so that the pressure exerted by
with said outer surface of said bearing portion.
said pressure area on said shaft is smaller than the pres
9. In a hydraulic machine, in combination, a housing
sure exerted by said bearing portion on said shaft under
having a hollow interior and an inlet and an outlet; a
the force of said pressure ?eld.
6. In a hydraulic machine, in combination, a housing 25 pair of meshing gears having shafts with parallel axes
and being disposed in said housing to form in said hol
having a hollow interior and an inlet and an outlet; a
low interior a high pressure chamber and a low pressure
chamber whereby said gears and shafts are urged in a
direction transverse to said axes away from said high
pair of meshing gears having shafts with parallel axes
and being disposed in said housing to form in said hollow
interior a high pressure chamber and a low pressure
chamber whereby said gears and shaft-s are urged in a 30 pressure chamber; a pair of bearing bodies located in
said housing on opposite sides of said meshing gears, each
direction transverse to said axes away from said high pres
bearing body having two bearing means for respectively
sure chamber; first and second bearing means located in
supporting the ends of both said ?rst and second shafts,
said housing on opposite sides of said gears for sup
porting the ends of both said shafts, respectively, each
bearing means having a bearing portion displaceable sub
stantially in said transverse direction and having an outer
peripheral surface located in said interior of said housing,
and an inner bearing surface for rotatably supporting
the respective shaft, each bearing means including pres
sure means on said outer surface connected with said high
pressure chamber so that the pressure of said pressure
means sustains said bearing portion and thereby the
respective shaft in radial direction against the pressure of
said pressure chamber, each bearing means having a pres
sure area on said bearing surface of said bearing portion
thereof and being formed with a passage in communica
tion with said high pressure chamber, said pressure means
and pressure areas being located substantially diametri
cally opposite to said high pressure chamber so that the
effect of the pressure on the outer surface of the bearing
35
each bearing means being formed with slots de?ning
thereon a bearing portion resiliently displaceable sub
stantially in said transverse direction, each bearing portion
having an outer peripheral surface located in said interior
of said housing, and an inner bearing surface for rotatably
supporting the respective shaft, each bearing means in
cluding pressure means on said outer surface, said bearing
bodies being formed with passages for operatively con
necting the pressure means thereof with said high pres
sure chamber so that the pressure of said pressure means
sustains said bearing portion and thereby the respective
shaft in radial direction against the pressure of said pres
sure chamber, each bearing means having a pressure
means to counteract the force of the pressure in the
area on said bearing surface of said bearing portion
thereof and being formed with a passage in communica
tion with said high pressure chamber, said pressure means
and pressure areas being located substantially diametrically
opposite to said high pressure chamber so that the effect
high pressure chamber on said shafts is reduced by the
high pressure acting in said pressure area, said passage
opening on said bearing surface in a port constituting
to counteract the force of the pressure in the high pres
sure chamber on said shafts is reduced by the high pres
said pressure area.
7. In a hydraulic machine, in combination, a housing
of the pressure on the outer surface of the bearing means
sure :acting in said pressure area, said pressure means
and said pressure area and passage being constructed and
having a hollow interior and an inlet and an outlet; a
arranged so that the pressure exerted by said pressure
pair of meshing gears having shafts with parallel axes
and being disposed in said housing to form in said hollow
by said bearing portion on said shaft under the force of
area on said shaft is smaller than the pressure exerted
interior a high pressure chamber and a low pressure 60 said pressure means.
10. In a hydraulic machine, in combination, a housing
chamber whereby said gears and shafts are urged in a
having a hollow interior and an inlet and an outlet; a
direction transverse to said axes away from said high
pressure chamber; ?rst and second bearing means located
in said housing on opposite sides of said gears for sup
porting the ends of both said shafts, respectively, each
bearing means having a bearing portion displaceable
substantially in said transverse direction and having an
outer peripheral surface located in said interior of said
housing, and an inner bearing surface for rotatably sup
pair of meshing gears having shafts with parallel axes
and being disposed in said housing to form in said hollow
interior a high pressure chamber and a ‘low pressure
chamber whereby said gears and shafts are urged in a
direction transverse ‘to said axes away [from said high
pressure chamber; a pair of bearing bodies located in
said housing on opposite sides of said meshing gears,
porting the respective shaft, each bearing means including 70 each bearing body having two bearing means for re
spectively supporting the ends of both said ?rst and
pressure means on said outer surface connected with said
second shafts, each bearing body being movable in axial
high pressure chamber so that the pressure of said pres
direction along said shafts and having an inner face
sure means sustains said ‘bearing portion and thereby
axially confronting said gears and an outer face axially
the respective shaft in radial direction against the pres
sure of said pressure chamber, each bearing means having 75 confronting said housing, each bearing body being formed
3,053,192
-
9
with conduit means for connecting said high pressure
chamber with said outer face thereof so that said bearing
bodies are urged inwardly toward said gears until said
inner faces abut the same, ‘each bearing means being
formed with slots de?ning thereon a bearing portion
resiliently displaceable substantially in said transverse
direction, each bearing portion having an outer peripheral
golréion on said shaft under the force of said pressure
e
.
. 12. In a hydraulic machine, in combination, a hous
111g having a hollow interior and an inlet and an outlet;
a pair of meshing gears having shafts with parallel axes
and being disposed in said housing to form in said hollow
interior a high pressure chamber and a low pressure
chamber whereby said gears and shafts are urged in a
direction transverse to said axes away from said high
surface located in said interior of said housing, and an
inner bearing surface for rotatably supporting the re
spective shaft, each bearing means including pressure 10 pressure chamber; ?rst and second bearing means located’
means on said outer surface, said bearing bodies being
in said housing on opposite sides of said gears for sup
formed with passages ‘for operatively connecting the
porting the ends of both said shafts, each bearing means
pressure means thereof with said high pressure chamber
having a bearing portion displaceable substantially in
so that the pressure of said pressure means sustains said
said transverse direction and having an outer peripheral
bearing portion and thereby the respective shaft in radial
surface confronting the inner surface of said housing and
direction against the pressure of said pressure chamber,
an inner bearing surface for rotatably supporting the re
each bearing means having a pressure area on said
spective shaft, each bearing means including an annular
bearing surface of said said bearing portion thereof and
sealing ring on said outer surface and being formed with
being formed with a passage in communication with said
a passage means communicating with said high pres
high pressure chamber, said pressure means and pres 20 sure chamber and with the space surrounded by said
sure areas being located substantially diametrically op
sealing ring so that a pressure ?eld surrounded by said
posite to said high pressure chamber so that the effect
sealing ring is ‘created between the inner surface of said
of the pressure on the outer surface of the bearing means
housing and said outer surface of said beaning means,
to counteract the force of the pressure in the high pres
said pressure ?eld being constructed and arranged so
sure chamber on said shafts is reduced by the high pres
that the pressure thereof sustains said bearing portion and
sure acting in said pressure area, said pressure means
and said pressure area and passage being constructed
and arranged so that the pressure exerted by said pres
sure area on said shaft is smaller than the pressure exerted
thereby the respective shaft in radial direction against the
pressure of said pressure chamber, each bearing means
having a pressure area on said bearing surface of said
bearing portion thereof and being formed with a passage
by said bearing portion on said shaft under the force of 30 extending between said pressure ?eld and said pressure
said pressure means.
11. In a hydraulic machine, in combination, a housing
having a hollow interior and an inlet and an outlet; a
pair of meshing gears having shafts with parallel axes
and being disposed in said housing to form in said hollow
interior a high pressure chamber and a low pressure
chamber whereby said gears and shafts are urged in a
direction transverse to said axes away from said high
pressure chamber; a pair of bearing bodies located in
said housing on opposite sides of said meshing gears,
each bearing vbody having two bearing means for re
spectively supporting the ends of ‘both said ?rst and second
shafts, each bearing body being movable in axial direc
tion along said shafts and having an inner face axially
confronting said gears and an outer ‘face axially con
fronting said housing, each ‘bearing body being formed
with conduit means for connecting said high pressure
chamber with said outer face thereof so that said bearing
bodies are urged inwardly toward said gears until said
inner faces abut the same, each bearing means being
formed with slots de?ning thereon a bearing portion re
siliently displaceable substantially in said transverse direc
tion, each bearing portion having an outer peripheral
surface located in said interior of said housing, and an
inner bearing surface for rotatably supporting the respec
tive shaft, each Ibearing means having a pressure ?eld on
said outer surface, and said bearing bodies being formed
area so that said pressure area exerts a force in said
transverse direction on said shaft, said pressure ?elds and
pressure areas being located substantially diametrically
opposite to said high pressure chamber so that the effect
of the pressure on the outer surface of the bearing means
to counteract the force of the pressure in the high pressure
chamber on said shafts is reduced by the high pressure
acting in said pressure area.
13. In a hydraulic machine, in combination, a housing
having a hollow interior and an inlet and an outlet; a
pair of meshing gears having shafts with parallel axes
and being disposed in said housing to form in said hollow
interior a high pressure chamber and a low pressure
chamber whereby said gears and shafts are urged in a
direction transverse to said axes away from said high
pressure chamber; ?rst and second bearing means located
in said housing on opposite sides of said gears for sup
porting the ends of both said shafts, each bearing means
having a bearing portion displaceable substantially in
said transverse direction and having an outer peripheral
surface confronting the inner surface of said housing and
an inner bearing surface for rotatably supporting the re
spective shaft, each bearing means having an annular
recess in said outer surface, and including an annular
sealing ring in said annular recess, each bearing means
being formed with a passage connecting said high pressure
chamber with said recess and with another passage con
with passages for operatively connecting the pressure ?eld
necting said recess with the space surrounded by said
thereof with said high pressure chamber so that the
sealing ring so that said sealing ring is pressed against
pressure of said pressure ?eld sustains said bearing por 60 the inner surface of said housing and a pressure ?eld sur
tion and thereby the respective shaft in radial direction
rounded by said sealing ring is created between the inner
against the pressure of said pressure chamber, each bear
surface of said housing and said outer surface of said
ing means having a pressure area on said bearing surface
bearing means, said pressure ?eld being constructed and
of said bearing portion thereof and being formed with a
arranged so that the pressure thereof sustains said bear
passage extending ‘between said pressure ?eld and said
ing portion and thereby the respective shaft in radial
pressure area, said pressure ?elds and pressure areas
direction against the pressure of said pressure chamber,
being located substantially diametrically opposite to said
each bearing means having a pressure area on said bear
high pressure chamber so that the effect of the pressure
ing surface of said bearing portion thereof and being
on the outer surface of the bearing means to counteract
formed with a passage extending between said pressure
the force of the pressure in the high pressure chamber 70 ?eld and said pressure area so that said pressure area
on said shafts is reduced by the high pressure acting in
exerts a force in said transverse direction on said shaft,
said pressure area, said pressure ?eld and said pressure
said pressure ?elds and pressure areas being located sub
area and passage 'being constructed and arranged so
that the pressure exerted 1by said pressure area on said
stantially diametrically opposite to said high pressure
chamber so that the effect of the pressure on the outer
shaft is smaller than the pressure exerted by said bearing 75 surface of the bearing means to counteract the force
3,053,192
11
having a bearing portion displaceable substantially in
shafts is reduced by the high pressure acting in said pres
sure ‘area.
12
porting the ends of both said shafts, each bearing means
of the pressure in the high‘pressure chamber on said
said transverse direction and having an outer peripheral
7
having a hollow interior and an inlet and an outlet; a CD1
surface confronting the inner surface of said housing
and an inner bearing surface for rotatably supporting
pair of meshing gears having shafts with parallel axes
and being disposed in said housing to form in said hollow
nular recess in said outer surface, ‘and including an an
bearing means having a bearing portion displaceable
?eld surrounded by said sealing ring is created between
porting the respective shaft, each bearing means having
tains said bearing portion and thereby the respective
a pressure ?eld on said outer surface connected with said
high pressure chamber so that the pressure of said pres
sure chamber, each bearing means having a recessed
sure ?eld sustains said bearing portion and thereby the
respective shaft in radial direction against the pressure of
said pressure chamber, each bearing means having a
recessed surface on said bearing surface of said bearing
portion thereof and being formed with a passage connect
ing said pressure ?eld with said recessed surface so that
direction on said shaft, said pressure ?elds and pressure
14. In a hydraulic machine, in combination, a housing
the respective shaft, each bearing means having an an
nular sealing ring in said annular recess, each bearing
interior a high pressure chamber and a low pressure
means being formed with a passage connecting said high
chamber whereby said gears and shafts are urged in a
direction transverse to said axes away from said high 10 pressure chamber with said recess and with another
passage connecting said recess with the space surrounded
pressure chamber; ?rst and second bearing means lo
by said sealing ring so that said sealing ring is pressed
cated in said housing on opposite sides of said gears for
against the inner surface of said housing and a pressure
supporting the ends of both said shafts, respectively, each
substantially in said transverse direction and having an 15 the inner surface of said housing and said outer surface
of said bearing means, said pressure ?eld being con
outer peripheral surface located in said interior of said
structed and arranged so that the pressure thereof sus
housing, and an inner bearing surface for rotatably sup
shaft in radial direction against the pressure of said pres
surface portion on said beaming surface of said bearing
portion thereof and being formed with a narrow throt
tling passage extending between said pressure ?eld and
said recessed surface portion so that the same consti
tutes a pressure area exerting a force in said transverse
areas being located substantially diametrically opposite
the latter constitutes a pressure area exerting a force in
to said high pressure chamber so that the effect of the
said transverse direction against the respective shaft, said
pressure on the outer surface of the bearing means to
pressure ?elds and pressure areas being located substan
tially diametrically opposite to said high pressure cham 30 counteract the force of the pressure in the high pressure
chamber on said shafts is reduced by the high pressure
ber so that the effect of the pressure on the outer sur
acting in said pressure area.
face of the bearing means to counteract the force of the
pressure in the high pressure chamber on said shafts is
References Cited in the ?le of this patent
reduced by the high pressure acting in said pressure area
UNITED STATES PATENTS
in radial direction, said passage having a selected small
cross section to throttle the how of a liquid therethrongh,
said pressure ?eld and said pressure area and passage
being constructed and arranged so that the pressure ex
erted by said pressure area on said shaft is smaller than
the pressure exerted’ by said bearing portion on said shaft
under the force of said pressure ?eld. _
15. In a hydraulic machine, in combination, a hous
ting having a hollow interior and an inlet and an outlet;
a pair of meshing gears having shafts with parallel axes
and being disposed in said housing to form in said hol
low interior a high pressure chamber and a low pressure
chamber whereby said gears and shafts are urged in a
direction transverse to said axes away ‘mom said high
pressure chamber; ?rst and second bearing means located
in said housing on opposite sides of said gears for sup
40
1,379,587
Fisher ______________ __ May 24, 1921
2,236,980
Ungar ___- ___________ .._ Apr. 1, 1941
2,319,374
2,714,856
‘2,728,301
2,746,394
2,870,719
2,891,483
2,993,450
Ungar ______________ .._ May 18,
Kane ________________ __ Aug. 9,
Lindberg ___________ __ Dec. 27,
Dolza et a1. __________ __ May 22,
Murray et ‘a1. _______ __>_ Jan. 27,
Murray et a1. ________ __ June 23,
Weigert ____; ________ __ July 25,
1943
1955
1955
1956
1959
1959
1961
FOREIGN PATENTS
782,701
Great Britain ________ __ Sept. 11, 1957
853,547
Great Britain _________ __ Nov. 9, 1960
1,006,722
Germany ___________ __ Apr. 18, 1957
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