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Патент USA US3043243

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July 10, 1962
R. D. RUMSEY
3,043,233
HYDRAULIC PUMP FACE TYPE VALVE PLATE AUTO BALANCING
Filed‘ March 20, 1958
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I Fo/h'? Doug/a5 Ramsey
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July 10, 1962
R. D. RUMSEY
_ 3,043,233
HYDRAULIC PUMP FACE TYPE VALVE PLATE AUTO BALANCING
Filed March 20, 1958
2 Sheets-Sheet 2
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3,?43,233
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Patented July 10, 1962
2
3.
3,043,233
sure radial piston-type pump or the axial type, but for
purpose of illustration, it has been shown with a ?ve
.
HYDRAULIC PUMP FACE TYPE VALVE PLATE
AUTO BALANCING
Rollin Douglas Rumsey, Buli’alo, N.Y., assiguor to Hou
daille Industries, Inc., Buffalo, N.Y., a corporation of
Michigan
'
cylinder radial piston hydraulic pump.
Referring now ?rst to FIGURES l and 2, a high pres
sure pump rotor and valve assembly constructed accord
ing to this invention generally comprises a housing 20,
an adaptor 21, a rotor 22, and a face type valve assembly
Filed Mar. 20, 1958, Ser. No. 722,683
4 Claims. (Cl. 103-161)
23 including an inner valve member 24 and an outer
ing a plurality of pistons, in radial cylinders, and a piston
drive system, the rotor and the piston drive system riding
is constructed in a suitable manner to have assembled
therein a driving shaft extension on the end of the drive
con?ned ring, or poppet 25, and an end‘cap 26 provided
This invention relates to means of maintaining uniform 10 with a threaded ?uid inlet opening 27 and a threaded
?uid outlet opening 28.
light pressure between a pump rotor and valve plate by
A drive shaft 37 and the rotor 22 are journalled by
means of a servo mechanism type pressure balance con
bearings in the housing 20 to rotate about a centerwith
trol.
'
in an annular radial thrust member 29, and it may be
It is the general object of the invention to provide an
improved pump comprising a stable servo mechanism 15 seen from FIGURE 2 that the rotor is provided with
a series of circumferentially spaced arcuate grooves 30
embodying two small anti-rock pistons combined with a
in its periphery. The rear hub portion or adaptor 21
high pressure radial piston pump having a rotor embody
20 shaft 37.
. on suitable bearings within a suitable housing.
Another object of the invention is to provide an im
proved pump of the class stated capable of operating at
high speeds, featuring a stable servo means affording a
The rotor has embodied therewtih, for ex
ample, ?ve passageways 32, 33, 34, 35 and 36 communi
cating with the ?ve cylinders of the pump.
,
The valve plate assembly 23, clearly shown by FIG
URES l and 4, is arranged in a substantially ?xed posi
uniformly light contact pressure between the rotor and
the valve plate by means of a servo mechanism type 25 tion, although as will now be described, the valve plate
24 and con?ned ring, or poppet 25, are permitted limited
pressure balance control embodying a plurality of small
axial movement in the‘end cap 26. Therefore, the valve
anti-rock pistons, and yet of simpler and cheaper con
plate 24 can be de?ned as a balanced valve plate. Said
struction than heretofore known.
'
Another object of this invention is to provide struc
valve plate 24 is maintained in ?uid-sealing contact with
ture permitting a minute amount of leakage across the 30 the end face 38 of the rotor, but without unnecessarily
valve plate face and con?ned ring of a radial piston pump
high contact pressure. A helical spring 40 is positioned
at all times which will serve as a lubricating ?lm and
in a cylindrical bore 41 with one end 42 thereof in con
tact with a shoulder 43 at the base of the bore 41 and
adjacent the outlet 28. The opposite end 44 of said
enough magnitude to destroy the e?iciency oflthe pump. 35 spring 40 is in contact with the extended end portion
45 of the valve plate tubular piston extension 46 to bias
Another object of this invention is to provide servo
the valve plate 24 towards the rotor 22. As any one of
means to stabilize the movement of the valve plate with
thereby prevent severe scoring, galing, as well as rock
ing, and, at the same time, the leakage not being of large
the ?ve pistons in the rotor moves radially outwardly
and recedes, from the bottom of one of the cylinders,
40 as, for example, in cylinder 47, shown dotted in FIG
URE 2, ?uid will ?ow through inlet 27, through port
A further object of this invention is to provide a
passage 49 in the valve plate-24, through an opening
minute ?uid ?ow passage from the passage at the rear of
such as 36 and into one of the associated cylinders such
the valve plate to the inlet port in order to allow the
as 47. As the piston is driven downwardly into its cylin
pressure behind the valve plate to be‘reduced in the
event it gets too high.
a
45 der, it forces the ?uid out through one of the passage
ways such as 36 to port passage 50 in the valve plate 24.
A still further object of this invention is .to provide
As best shown by FIGURES land 4, the valve plate 24
sui?cient leakage of ?uid across and to the rear of the
is integrally ?tted with a tubular piston 46 ?tted in the
face of an underbalanced valve to build up pressure .ap
bore 41. The internal passageway 52 of the tubular
proximately 1A of the outlet pressure in a fluid zone
which acts against the substantially entire rear orback 50 piston .46 is adapted to connect at one end with bore 41
which connects with outlet 28, while the opposite end of
face of the inner member of the valve plate causing it t
said passageway 52 is in communication with port pas
nearly reseal and become balanced.
Y
'
sage 50 in the valve plate 24. The valve plate 24 is
Various other objects, features and advantages-of the
normally urged towards the end of the rotor 22 by the
invention will hereinafter become more fully apparent‘
helical spring 40, as described above.
from the following description of the drawings, illustrated
The high pressure ?uid is forced through port 50,
presently by the preferred embodiments thereof and
passageway 52, bore 41 and outlet 28. The valve plate
24 is acted upon by the high pressure ?uid, such as oil,
FIGURE 1 is a vertical crossgsectional view through
and as the ?uid is discharged from passageway 36 of the
a fragmentary portion of a housing and valve assembly
unit constructed according to this invention, the valve 60 rotor 22, the plate would be driven away from sealing
reference to the rotor at a ?xed position and wherein
only a slight amount of leakage ?uid ?ow is maintained
continuously.
wherein:
.
.
a
>
.
V
plate of said valve assembly being mounted in conjunc
engagement with the face of 'the "rotor were it not for
the action of the spring 40 and the tubular piston‘ 46
formed integral with the valve plate 24. The valve plate
shown in side elevation;
,
I
.
'
24 is surrounded about its peripheral edge portion by
FIGURE 2 is an end elevational view of the pump
rotor showing the ?ve ports which rotate in contact with 65 the outer con?ned ring, or poppet 25, the space between
said valve plate and said outer ring providing an annulus
the face of the valve plate of the valve assembly;
tion with an annular thrust member and a pump rotor
’ FIGURE 3 is an end elevational view showing the
face of the valve plate, the outer ,COn?ned ring, and the
associated parts of the valve assembly; and
55’ to conduct ?uid leakage to a ?uid collecting zone
68 at the rear of said valve plate. The poppet, or outer
ring 25, has a central bore 55 extending therethrough of
' FIGURE 4 is a fragmentary cross-section through the 70 an internal diameter approximately .00 ” larger than the
valve assembly taken on line IV—IV of FIGURE 3.
The invention may be embodied with any high pres
outer diameter of the valve plate 24, thereby forming the
annulus 55', and said poppet further is formed with a
4
?ange portion 56 having a face 57 which must be opti
surface intermediate the ?uid passageways 84 and 85.
cally ?at and square with said bore~55. The ?ange por- ' r The upper port 90 having circular side portions connects
' tion 56 is provided with an outwardly extending boss 58 7
arranged to contact the outwardly extending end portion
59, of a pin 6tl_projecting from the inner face of said
end cap to prevent rotation of the poppet. "The opposite
with the outlet 28’ by interconnecting passageways, while
the lower port 91, having an upper edge, arranged hori
zontally, connects with'the inlet '27 by interconnecting
passageways.
' end of said pin 601 is pressed into a'bor'e in the inner
vertical wall of said end cap 26. The inner end of said '
end cap 26 is provided with a central bore 62 of a diam
' eter greaterrthan the outer diameter of the rear end’ of 10
',said poppet 25. A hub portion 64 of a diameter equal
The pump rotor 22 with the five arcuate
shaped openings rotates around the face 'of the valve plate
alternately by exposure to inlet and outlet ports. A
groove, or V-shape gutter 92 is provided in theface of the
valve plate and is arranged horizontally between said
ports 90 and 91. A minute passage formingra pressure
or slightly larger than that of said valve plate 24 is
bleed opening 93 is drilled ‘from one end of the gutter 92
formed on the inner end of the cap 26 and extends into
' through the valve plate 24 to the ?uid zone 68 at the rear
central bore 55 of poppet 25. The inner end of said
of said face plate. FIGURE _3 shows the position of the
endrcap 26 is also recessed for a short distance with an 15 pump rotor port positions as dotted for discussion. There
enlarged bore 62’ to provide clearance for the horizontal
fore, it may be seen that the rotor ports communicate the
travel of the ?ange 56 of poppet 25. A helical spring
63 is arranged about the base‘ portion 65 of the outer
pressurized hole from the balancing pistons to the high
pressure discharge port of the valve, only when these ports
ring or poppet 25 and within the bore 62. One end of
are in certain positions as shown in FIGURE 3. vIt is only
spring 63 engages the‘ bottom portionof said bore 62,
while in these positions that the additional balancing force
and'its opposite end is in contact with the underside of
provided by the anti-rock pistons 86 and 87 is required.
said ?ange 56 to bias said poppet 25 toward said rotor
Therefore, the pressure applied to the balancing pistons 86
22 of the pump. The cylindrical base portion 65 of said
and 87 depends upon the position of the rotor. This
poppet 25 is of su?icient length to con?ne‘the outer
combination of circumstances results in the'selective bal
cylindrical walls of said valve plate 24 and said hub 64. 25 ancing produced by said pistons 86 and 87. For example,
The inner wall of said poppet 25 is provided with an
when port 32 is in registry with passageway 84 as shown
annular groove 66 adjacent its inner end providing means
dotted in- FIGURE 3, the high pressure ?uid ?ows through
to‘ retain an O ring 67 providing a ?uid seal between said
said passageway 84 coming into contact with the top of the
poppet, 25 and said hub 64. 'A ?uid zone 68 is formed '
piston.86. .The uppersurface of said- piston 86'being
between the forward end surface of said hub 64 and the 30 greater, than the lateral area of the passageway 84, the
rear surface of said valve plate 24. A cylindrical bore
high pressure is exerted upon the bottom 82 of bore 8%)
70 is provided in the rear surface of said valve plate 24
urging the face plate towards the rotor 22 tending to assist
adjacent to and communicating with the port passage 49.
in balancing the face plate.
. .
>
~
A cylindrical bore 71, of the same diameter as bore 70,
. To summarize the operation of the present device, ?uid
is provided in said end cap 26 communicating with said 35 enters the inlet27 in the end cap'26 passing generally
?uid passage 72 which is in communication with ?uid
axially therethrough and into the passages 72 and 49 to
?ow inlet 27, said bore 71 being in horizontal alignment
one of the openings 32-36 in the rotor 22. The latter
with saidbore 70. A sleeve 73 is horizontally arranged
openings communicate with ‘the ?ve. cylinders, and pres
within said bores 70 and 71, said sleeve being provided
surized ?uid enters one of said openings during clockwise
with two annular grooves with O'ring's. therein to form 40 rotation of the rotor to drive the piston in the cylinder.
a sealed passageway, between said valve plate 24 and
said ?uid ?ow passage 72; the sleeve .73 ismovable rear
Essentially simultaneously, ?uid is ported from another
cylinder through one of said openings to the valve plate
Wardly into said bore 71 ‘when the valve plate 24 is
biased rearwardly by high pressure ?uid.
''
passage 50 to the passageway 52 and through thebore 41
.
. The valve plate 24 asishown by FIGURES 3 and 4 has 45
to the outlet 28 .in the end cap 26.v
'
The valve plate 24 and guide ring or poppet 25 are
embodied in the rear facethereof two bores 80 and 81,
urged against the rotor 22,by the springs 40 and .63,
radially ‘spaced from each other, and extending for a suit
respectively, and the'valve plate is in ?uid cushioned rela
able depth, and said bores having bottoms 82 and 83
tion with the hub 64 of the end cap by means ofja ?uid
spacedra short distance from the face of said valve plate
zone 68 therebetween. As appears in FIGURE 3, the
' '24. Central passageways 84'and 85, or apertures, are 50 valve plate 24 has ports 90 and 91 therein which selec
provided betweenthe ‘face of the valve plate 24 and said
tivelycommunicate a pair of passages 32--36 with the
bores 80 and 81. Balancing pistons 86 and 87 are assem
passages 84 and 85 to the balance pistons 86 and’ 87 and
- ‘bled within said bores 80 and 81, each piston being cham
with the outlet 28. Accordingly, during clockwise rotor
ifered ‘at its ends. and provided with a central ‘annular
rotation, as in FIGURE 3, ?uid from the passages’ 32
groove intermediate the ends thereof whereby 0 rings 55 and 35 in the rotor 22 acts against the pistons 86 and 87
I may be inserted to liquid seal the pistons with the walls of
the bores and prevent ?uid?ow from the vfarce of said
valve plate, through passageways 84 and 85 to said bores
80 and Stand the ?uid zone 68. A minute ?uid ?ow
passageway 89 (FIGURE 1) is provided in the end cap 26
extending from the ?uid zone 68 to the ?uid ?ow passage
72 communicating with the inlet 27 .. The passageway 89
connects the area behind the valve plate 24 to the inlet
port 27 in order to allow ?uid pressure behind the valve
simultaneously to perform the balancing function, and by
provision ‘of the communicating passage or port 90, the
V pressurized ?uid is discharged through the outlet 28.
It will be observed that a novel high pressure displace
60 ment pump has been described, the pump embodying a
rotor 22 with a plurality of radial pistons, a novel valve
plate 24 with inlet and outlet ports in contact with the
end of said rotor, and servo mechanism type pressure
balance control for maintaining uniform light ?uid pres
‘plate to be, reduced, in the event it gets too high, the 65 sure-between the rotor and valve plate assembled there
7 ' desired pressure being approximately'% that of the outlet
with. This invention provides novel means of a?ording
a uniform light contact pressure between the valve plate
The pump rotor 22 has been described above as having
24 and the rotor 22,
being necessary since under
?ve arcuate shaped openings 32, 33, 34, 35 and 36 to pro
normal conditions the, only area in thervalve .plate 24
vide passageways for the ?uid being pumped thereby.
experiencing full discharge pressure is thearea of the
The valve plate 24 and the poppet 25 are urged towards
discharge port and any area extended therefrom that is
the end of the rotor, the poppet being urged by the helical
pressurized by ‘interconnecting action of the rotor ports.
' spring 63 ‘and the valve plate being urged by the helical
This normal condition will occur all the while the valve
spring40 arranged and cooperating therewith. The valve
plate .724 and rotor 22 are in intimate metal to metal con
plate‘24has two oval ports9t} and 91 arranged in its face 75 tac'tjwhich occurs only if both faces are absolutely ?at,
7
pressure.
‘
3,043,233
5
t5?
.
' (1‘) second spring means continually urging said valve
probably
better than two light bands, that is,
.000006". In actual practice, the ?atness of two light
plate toward said rotor;
'
bands does not generally persist for any period of time.
(g) a fluid collection zone de?ned jointly by said guide ‘
Therefore, when high pressure displacement pumps of the
ring, said housing, and that side of said valve plate
which is opposite to its sealing face, said zone exclud
ing and being substantially sealed from valve plate
portions on said side communicating with ‘the inlet
and outlet passages; and
(h) an annular passage de?ned jointly by said guide
said type vare used, wear or hot spots often occur and great 5
leakage extends across these surfaces which extends the
area of high pressure to an'area larger than the valve
port itself. When the balancing pistons in a valve plate
are set up to exactly balance the discharge port area only,
then as soon as wear and leakage start to occur the valve 1O
ring and said valve plate, and freelycornmunicating
plate will immediately be blown away from the rotor by
the increased force developed by the pressure acting over
said sealing face of said valve plate with said collec
tion zone;
a large area. In order to prevent the valve plate from
whereby, during operation, slight continued leakage at
blowing off, current pump practice has been to supply
said sealing face, tending to move said valve plate with
excessive balancing pressure or force such that under ideal
conditions very high contact pressure exists between the
rotor and valve. This situation is conducive to high dry
respect to said housing, in a direction away ‘from said rotor
end face, will be continually conducted by said annular
passage to said collection zone for acting on and thereby
assisting said second spring means in moving the valve _
friction and wear, thereby initiating the vicious cycle
plate toward said rotor end face to an equilibrium position
mentioned above, which-must be eliminated. The object
of this invention is to provide a minute amount of leakage 20 of slight spacing with respect to said rotor end face for
minimizing the quantity of continual leakage and for
across the valve plate face at vall times which will serve
lubricating said ‘faces with ‘a continuous flow.
2. A high pressure piston pump or motor comprising:
(a) a rotor having a plurality of piston-receiving cylin
as a lubricating ?lm and prevent hot spots and wear and,
at the same time, not be of large enough magnitude to
destroy the pump e?iciency. This is accomplished by
ders therein, and a plurality of passages communicat
ing said cylinders with openings in an end face of
said rotor;
(b) a valve housing having inlet and outlet pass-ages;
virtue of the fact that as high pressure ?uid flows across 25
the valve face into the annulus 68 between the valve plate
24 and the outer ring, or poppet 25, pressure is built up
behind the whole valve plate except for the area of the
(c) an annular guide ring slidably carried by said hous
ing, said guide ring having an annular sealing face
disposed against the outer periphery of the rotor end
discharge port which is subjected to inlet pressure. The
port sizes have been chosen such that this pressure buildup 30
will act as nearly as possible behind the high pressure out
let port; in common practice this is not perfectly realized.
face;
(d) ?rst spring means continually urging said guide
If the pressure behind the valve'plate builds up as a con
sequence of this leakage, it exerts a ‘greater pressure,
hence the force on the rear of the valve plate 24 thereby .
ring against said rotor;
, (e) a valve plate disposed within said guide ring and
slidably carried by said housing, said valve plate hav
ing a sealing face adapted to be disposed against the
rotor end face, said plate being ported through said
sealing face for successively communicating the inlet
drives it toward the rotor 22 in order to reduce this leak
age. With any friction whatsoever in the system this ac
tion will stabilize at a ?xed position wherein only a slight
amount of ?ow is maintained continuously. This ?ow
is further retained because a minute passageway 89 is 40
provided from the zone 68 behind the valve plate 24 into
the passage 72 communicating with the inlet port 27 in
order to allow this pressure to reduce in the event it gets
too high.
'
and outlet passages of said 'valve housing with said .
openings of the rotor;
(f) second spring means continually urging said valve
plate toward said rotor;
(g) a ?uid collection zone de?ned jointly by said guide
ring, said housing, and that side of said valve plate
which is opposite to its sealing face, said zone ex
cluding and being substantially sealed from valve
plate portions on said side communicating with the
’
It is believed that this invention provides a new and 45
novel stable servo mechanism capable of performing the
function and objects as stated.
'
I have, in the drawings 'and speci?cation, presented a
detailed disclosure of the preferred embodiments of my
inlet and outlet passages;
(h) an annular passage de?ned jointly by said guide
invention, but it is to be understood that I do not intend
to limit the invention to the speci?c form disclosed but
intend to cover all modi?cations, changes and alternative
ring and said valve plate, and freely communicating
said sealing face of said valve plate with said'col
lection zone; and
constructions falling within the scope of the principles
taught by my invention.
55
I claim as my invention:
'
(i) a bleed passage connecting said ?uid collection zone
with a lower pressure region within said housing;
whereby, during operation, slight continual leakage at
1; A high pressure piston pump or motor comprising:
said sealing face, tending to move said valve plate with
(a) a rotor having a plurality of piston-receiving cyl
respect to said housing, in a direction ‘away from said
inders therein, and a plurality of passages communi
rotor end ‘face, will be continually conducted by said an
cating said cylinders with openings in an end face of
60 nular passage to said collection zone for acting on and
said rotor;
thereby assisting said second spring means in moving the
(12) a valve housing having inlet and outlet passages;
valve plate toward said rotor end face to an equilibrium
(c) an annular guide ring slidably carried .by said hous
position of slight spacing with respect to said rotor end
ing, said guide ring having an annular sealing face
face for minimizing the quantity of continual leakage and
disposed against the outer periphery of the rotor end
face;
(d) ?rst spring means continually urging said guide
ring against said rotor;
i for lubricating said faces with a continuous ?ow, said
bleed passage being operative to preclude a pressure build
up in said collection zone of such magnitude as would stop
-
(e) arvalve plate disposed within said guide ring and
slidably carried by said housing, said valve plate hav 70
ing a sealing face adapted to be disposed against the
rotor end face, said plate being ported through said
sealing face for successively communicating the inlet
and outlet passages of said valve housing with said
openings of the rotor;
'
said continual leakage.
said rotor;
75
’
3. A high pressure piston pump or motor comprising:
(a) a rotor having a plurality of piston-receiving cylin
ders therein, and a plurality 'of passages communicat
ing said cylinders with openings in an end face of
,
(b) a valve housing having inlet and outlet passages;
3,043,233
(c) an annular guide ring slidably'rcarried by said
housing, said guide ring having an annular sealing
'(d) ?rst spring means’ continually urging said guide
' face disposed against the outer periphery of‘the ro< ’
(e) a valve plate disposed Withinsaid guide‘ring and
slidably carried‘b‘y said; housing, said valve plate hav
ing a sealing face adapted to be disposed againstthe
rotor end face, said plate being ported ,through'said
sealing face for successivelyv communicating them
tor end face; ‘
ring against said rotor;
V
(d) ?rst spring means continually urging said guide
ring against said rotor;
'
a.
i
(e). a valve plate disposedwithin said’ guide ring and
slidably carried by said housing, said valve plate hav
said openings of the rotor;
plate toward said rotor;
'
'
'
ring, said housing, and that side of said valve plate
1
which is opposite to its sealing face, said zone ex
cluding and being substantially sealed from valve
plate portions on said side communicating with the
15
‘ (g) a ?uid collection zone de?ned jointly by said guide
ring, said housing, and that side ofsaid valve plate
inlet and outlet passages;
which is'opposite to its sealing face, saidzone ex
(h) an annular passage de?ned jointly by said guide
ring and said valve plate, and freely communicating
said sealing face of said valve plate with said collec
cluding and, being substantially sealed from valve
plate portions on said side communicating with the 20
inlet and outlet passages; and
. Y i
(g) a ?uid collection zone de?ned jointly by said guide
(f) second spring means continually urging said valve
plate toward said rotor;
'
(7‘) second spring means continually urging said valve
10
sealing face for successively communicating the in
let and outlet passages of said valve'rhousing with
said openings of the'rotor;
-
let and outlet passages of said valve housing with
' ing 'a sealing face adapted to be disposed against the
rotor end face, said plate being p'ortedrthrough said
‘
‘
tion zone; and
V
V
(h) a groove o'pening'into the‘sealingface' of saidvalve'
plate'remotely from the porting thereof, said valve
(i) a groove opening into the sealing face of said valve
plate having a further passage interconnecting said
groove and said ?uid collection zone;
' plate having av further passage interconnecting‘said
whereby, during operation, slight continual leakage at
whereby, during operation, slight continual leakage at
said sealing face, tending to move said valve plate with
respect to said housing, in a direction away from said
rotor end face, will be continually‘ conducted by said
said sealing'vface, tending to move said ‘valve plate with '
respect to said housing, in a direction away from said ro
plate remotely from the porting thereof, said valve
groove and said ?uid collection ‘zone;
acting on and thereby assisting said second spring means
in moving the valve plate toward said rotor end face to
an equilibrium'position of slight spacing with respect to.
said rotor end face for minimizing the quantity of con
tinual' leakage and for lubricatingsaid faces with‘ a con
flow.
7
'
.
'
V
V
v
I ~
tor end face, will be continually conducted by said an
nular passage and by said groove and further passage to
said collection zone for acting on and thereby assisting
groove and further passage to said collection zone for
tinuous
'
said second spring means‘in moving the valve .plate to
ward said rotor’ end face to an equilibrium position of
slight spacing with respect to said rotorend face for mini
35 mizing the quantity of continual leakage and for lubri
cating said faces with a continuous ?ow.
_
'4. A'high pressure piston pur'npw or motor comprising:
References Cited in'the ?le of this patent
(a) a rotor having a plurality of piston-receiving cylin
ders therein, and a plurality of passages communicat
UNITED STATES PATENTS
ing said cylinders with ‘openings in an end face of 40 2,430,764
Gabriel _____ _.'_____;._'__. Nov. 11, 1947
s'aid rotor;
,
_
K
.
(b) a valve housing having inlet and outlet passages;
(c) an annular guide‘. ring slidably carried by said
housing, said guide ring having an annular sealing
face disposed against the outer periphery of the ro
tor end face;
a
7
>
2,484,337
Ferris ______________ _._ Oct. 11, 1949
2,525,498
Naylor et a1. _________ __. Oct. 10, 1950
2,608,934
Ferris ______________ __ Sept. 2,,1952
2,620,736
Overbeke ..__.___ _______ __ Dec.‘9,1-1,952
,j2,733,666
Poulos ____ -g _____ _..>___ Feb. 7,' 1956
5, 1958
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