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Патент USA US2404175

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„may as, 1946.
w; c. HOLDEN ETAL A .
2,404,175
HYDRAULIC Í’UMP OF THE RADIAL CYLINDER TYPEA
Filed‘oct. s, m43 '
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July 16, 1946.
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HYDRAULIC PUMP OF THE RADIAL' .CYLINDER TYPE
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HYDRAULIC PUMP oF THE RADIAL CYLINDER TYPE
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HYDRAULIC PUMP 0F THE RADIAL CYLINDER TYPE
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Patented July 16, 1946
2,404,175
gUNITED STATES PATENT o FFI CE
2,404,175
HYDRAULIC PUMP 0F »THE RADIAL '
CYLINDER
TYPE
l
f
`
Warwick Claude Holden and Joshua Challiner
Naylor, Monkseaton, England, assignors to
Vickers-Armstrongs Limited, London, England,
a company of Great Britain
_
Application october s, 1943, serial No. ,505,491
`In Great Britain June 25, 1942
7 Claims. (Cl. ID3-38)
This invention relates to hydraulic pumps of?"
2
,
ypari; of the pump
ing ram being in casing, the boring in the ñoat
permanent connection witha
passage .or passages in the cover plate leading >to
ythe kind which include a series of» cylinders and
the delivery side of the pump,
pump at the deli ery side being the fluid in the
therefore in per
.10
15
fluid at the delivery side of the pump.
Without circulation ‘of the pressure fluid, the
pump rbeing virtually in a v“stalled” condition, the
fluid circulated bythe rotor in such a case pass
ing via the pump casing to the fluid head tank,
20
tem is kept at a uniform temperature:
, _
_ '
The invention further resides ~in 'providing a
compact construction of pump having a minimum
of rotating parts, permittingextens'ive'use oflight
alloys >and consequently the'formation» of apump
which >is light in Weight.
`
'
_
'
In order that `the said invention maybe clearly
understood. and `readily carried into `eiïect Athe
same will now be more fully described With'ref
erence to the accompanying drawings» ywherein:`
Figure 1 is a longitudinal vertical section'of- an
hydraulic pump constructed in accordance Iwith
the invention.
Y
'
'
Figure 2 is a transverse fragmentary section
Va5 taken through the cylinder assembly and variable
stroke eccentric.
`
_
_
’
Figure 3 is a sectional plan view illustrating the
construction of the mechanism employed in Fig
ures 1 and 2 for varying the effective stroke of the eccentric,
-
_
'Figure 4 is a longitudinal vvertical section_illus
trating an alternative form of hydraulic pump. „
‘Figure 5 is va transverse fragmentary section
45
taken through Athe cylinder assembly and eccen
tric.
'
l
Figure 6 is a sectional View of the eccentric and
"spring saddle incorporated in the pump illus*-À
trated by Figures 4_ and 5.
`
Figure >7 is a longitudinal vertical section illus
trating a further modiñed form of pump.V „ _Y
lFigure 8 is a transverse section thereof r.through
the cylinder assembly and its eccentric. _ . _'
_ Figure 9 is a sectional viewzillustrating the 'con
struction of the operating mechanism for varying
55 the eifective stroke of the eccentric and/0r pres
2,404,175
comprises a ring 63 of flexible material which is
of substantially U-shape in cross section and is
disposed in a recess 64 formed between the parts
by Figures 7 and 8.
.
50 and 5I. Also located on the part 50 and
Y Referring in the first case to Figures 1-3 of the
adapted to co-operate with the ring 63 is a second
accompanying. drawings, the pump body I Vis bored
radially tofforrn anumber of radially'arranged 5 , ring 65 whichmay be formed ofY brass or other
sure setting incorporated in the pump illustrated
cylinders in each ofrwhich cylinders isslidably
mounted a piston 2, each cylinder being closed.,
, suitable material' and provided with suitable con- ’
at its outer end by means of a cover plate 3, out- `
' pressure of liquid outside the valve to act on the
` duits, channels or the like adapted to allow the
ring 63 and cause the same to expand to effect
ward movement of the pistons within- their asso
eiated ` cylinders being controlled by an eccentric 101y a liquid seal between the two parts 59 and 5I.
of variable stroke carried by a driving, shaft. The ` The valve above described operates in such a
1 manner that when liquid pressure is exerted from
driving shaft 4 is rotatably mounted within bear
outside the valve it will act on the part 59 and f
ings 5 in a distance piece 6 which is bolted to the
face 59 of that part into con
pump body at one end, the shaft being rotatably/„g force the operative
’
The pressure out
mounted at ' its opposite endwithin bearings 1 15; tact with the sealing face 55.
side the valve also acts on the part 5I and forces
2in the pump body, the shaft being extended be-v
yond the bearings to carry a rotor 8 for 'the-pur-Y
the voperative face 6I into contact with the seal
pose of maintaining fluid circulation ¿when the j
-ing* face 56 on the cover II.
I idling, so asv not to produce the pressure required
'Nd 505,490, and engage seatings in slippers I4
f
Y The pistons at their inner ends are of part
pump is maintaining pressure in the delivery pipe f
,line without circulation 'of the pressure fluid, the 20 ` sphericalshape, as disclosed by the specification
Ípump being virtually ina “stalled” position, i. e. ` »' and drawings circo-pending patent application
which in turn engage the outer surface of an an- '
to 'driveï the apparatus when it is operating from I
’ nular ring I5, the latter being rotatably mounted
the
a casepassing
pump the fluid
via circulated
the pump by
casing
the rotor
to the
in such
fluid 2,5 about the eccentric, needle type bearings I6 being
interposed between the eccentric and the ring I5
head tank, the fluid thence returning via the inlet
with the object of reducing friction between the
This
circulation
ensuresthat
the
fluid
in
y
. pipe.
l the system is kept at a uniform temperature.
parts to a minimum
l
The eccentric I8 is slidably> mounted upon the
`
The flow of oil or other fluid to and from the, .
1 pistons is controlled by an eccentrically actuatedv 30 driving shaft ina direction at right angles to
the'shaft’s axis, the shaft at the point I1 where
3 valve 9, such as, for example, the self sealing type
the eccentric is mounted, thereon being of square
ï of valve forming the subject of British Patent
or rectangular shape, which will provide two par
N0.
503,148.
'The
valve 9 Loperates within a recess formed... allel plane surfaces over which the eccentric can
in a cover plate »I0 which is bolted to the pump `35
body,` the oil orV other fluid entering the pump
by. way. of the fluid admission passage II, .and
leaving? the pump by way of the fluidV delivery
passage I2. The passage of fluid to and fromy
the cylinders under thel control of the eccen-
shaft...
‘common fluid inlet and discharge passages I3,l
'
«
To enable the eccentric I8 to be moved at right
angles to the axis of the shaft with a minimum
of friction, rollers 26 are provided which rollers
are rotatably mounted upon pins 2l, the rollers
40 making contact with the 'plane surfaces of the
trically actuated 'valve takes place by way of the
.which'le'ad to the respective cylinders. .
slide.
'
Y The said .valve comprises two concentric parts
50 and `5I the outer of which,l 5I, is freelyl'ourVnalled on the inner and is driven therefrom by
means of a driving pin 52 mounted in the part 50
and adapted to engage between a pair of shoul
`
'
'
The inner, part 50 is
.ders formed `on the part 5I.
mounted in anysuitable manner on an eccentric
L
'
V
l
r
;
The eccentric I8 is maintained normally in its
position of maximum eccentricity by a number,
_for example four, helical springs 23 located within
45 blind _borings 24 in the shaft, the springs due to
their initial compression maintaining the eccen
tric ,I8 normally in contact with the adjacent
curved surface of the shaft.
.
A hollow ram 25 (see particularly Figure 1) is ‘
slidably mounted within a radial boring in the
shaft,` the lower end of the ram contacting, the
inner _surface of the eccentric I3. The ram is
>bored axially as at 26 and is bored radially as at
member 53 which is associated with Ythe shaft,
and by virtue of such eccentricity the whole valve
Vis caused on rotation of the shaft to move in an
21, the radial borings communicating with lthe
eccentric path over sealing faces 55 and 56 formed
on the outer end of a cylinder block or barrel 55 laxial boring 26, the ram being also formed with
and on -the inner surface of the endV cover I0. v a peripheral groove28 which communicates with
The inner part 5011s formed with Ían voperative
Aface 59,0f annular form opposed to the cylinder
block which is adapted to control a ring of ports
' such as 60 forming the outer termini of the pas-V
sages I3, which are arranged in the sealingv face
55 at a constant radius'from the centre of the
shaft while rthe outer part 5I is also provided with
the radial borings 21.
.
»
~
The boring 26 in the ram is connected with
y Y the delivery side 'of the pump by wayy of an axial
60 .boring 29 in a floating ram 30 slidably mounted
within an axial boring in the driving shaft 4.
The floating ram 30 is spherically seated into a
face member 3l». driven by the shaft 4 and so
_proportioned to maintain a runningpressure seal
an operative face 6I adapted to slide over the
A plurality of 05 at the sealing face of the stationary cover plate
inner face 56 of the end cover .I I.
`
axially. directed springs such as 62 are interposed ' I0 and is sealedby the pressure exerted by the
viluid on the inner end of the. floating ram, a _coil
between the two parts 50 and 5I in known man
spring 32 being associated with the floating ram
30’for maintaining contact of the, face member
periods when the liquid pressure falls below a pre- 70 3I with the sealing face on the adjacent surface
of the cover plate when the iiuid pressure is below
determined value while a suitable sealing device
is also provided Vbetween the periphery of» the
that exerted` by the sprmg. The boring in the
ñoating ram 30 is in permanent connection with
' inner part 50„and the outer part 5|, in ordento
prevent leakage of liquid between said parts. In
the embodiment illustrated thev sealing device 75 a passage 33 in the cover plate leading to the
' ner to cause the operative faces 59 _and 6I to bear
against their respective sealing faces during those .
ITB
\ livery fpassage ~|2rofîthe vpump,"ftl:re a'xtalïfboring
fin thefsha'ft for?tlre receptionfof‘the{ñnating'ram
'nected ¿together 'during'fthe @inward istróke ~îof inthe
Jpistrms.
'
‘
’
‘ The îpins «'39 “resi-,sin -"arcuate shaped seatings
formed in slippers ¿f4 ‘which 2in Y.turn V’engage*the
lperipheralfsurface r4fo‘f wa ring I5 surrounding the
rreducingcther outputfrom-ïthe pump.
ïIn fthisf arrangement V‘fend f caps .ïI-‘9 faire -arrange<2l
Afon opposite'sid-es of the Y"eccentric, ièthe len-d caps
~being located *between i face "í?la'tes |59a vrsecured îto
tthe-rclriv'ingfshaft. v"The Aenclf'cans «`l=9f;servef|toïloca`„te
"the nomponeritfparts 'ofthe 'eccentric i'n-fan axial
~.directi0n1 and/‘also /theßannulariring 115 fwith‘lwhich
the‘slippers-‘errgage.
‘The distance .piec'ei6 is mrc-vided 1W1`th§an addi
“tional lfluid p'ort |ï2a îleading gto ithe ‘ñuîd 'fhea'd
"access by'way of an axialbyorín'g in the driving
ftank,f‘so ‘that lthe 'pump ’l‘housing?is `'always fsup»
shaft and ‘a'hollow Heating ram `such as ¿that
lplied“withhydraulicfluid.
illustrated în'fFi‘gure ‘1. The arrangement’is "such
îtn ‘the modified :construction fof ßpump illus
:trated by‘Fíguresxä-'andßì whicnis-'deslgned par
ïitight connection.
v
"The arrangmen't of >’the pump ` i's-fgenerally ilsím
to'thatdisclosed by’Figures 'I1-i3 and furîthat
>reascn I'similar reference "numerals Íare -femp'l‘oye'd
to indicate similar~ or substantiallyfsimilarparts.
45 "
~by aring ‘|811forming‘ the 'eccentric lare k:separated
^ from Tthe 'l
60
»
of the pistons in an outward direction.
In each construction illustrated the slìdable
eccentric is held at
70
ensure that the pin and piston
2,404,175
position corresponding-t0 a
§axis of the shaft, this the quantity of iiuid de
no-delivery position, being thus determined by
¿livered by the fluid
pumpat the delivery side.
l the pressure of of the eccentric and, therefore,
`
the degree of eccentricityV of the-.eccentric'and
effective length of stroke of the> pistons; the
‘ the effective stroke of the pistons, is of course .de
at the delivery side.
` pendent on the fluid pressure
Such a construction of pump as is hereinbe
'
virtue of its light and compact V10
provision of opposedV plane surfaces on the shaft
and »eccentric respectively, anti-friction means
located betweenV said plane surfaces, and a fluid
actuated ram for varying the degree of eccen
tricity of the eccentric, said ram being located
construction Vris particularly suitable for use
on
anti
` aircraft and for dealing with extremely light
r freezing oils, and is capable of high rotational
within _a boring in
the shaft and movable in a ‘
direction at right angles to the axis ofthe shaft
and means permanently connecting said ram
with the delivery side of the pump.
-
f
,
p» 4. In a hydraulic pump having a series of
cylinders and pistons radially- arranged around
av common driving shaft an eccentric in operative
What we claim and desire to secure byLetters 15 engagement with the shaft »and in> driving con
nection with the pistonsy and means which 'is
ïl Patent of the United States is:having a series of ‘
responsive tothe influence of the fluid-pressure
l. In a hydraulic pump
l speeds.
j cylinders
and
y
`
pistons radially arranged around
a common driving shaft an
eccentric in operative
engagement with the shaft and in driving con
nection with the pistons and means which is
the fluid pressureV
~ responsive to the influence of
in the dischargeside of the pump for varying the
degree of eccentricity of the eccentric and effec..`
tive length of stroke of the pistons; the provision
of opposed plane surfaces on the shaft’and ec 25
centric respectively, anti-friction means-located
in the -discharge side of the‘pump for varying
the degree of eccentricity of the eccentric and
effective length of stroke ofthe pistons; the pro
vision of opposed planeA surfaces on the shaft
and eccentric respectively, anti-friction means
located between said!y plane surfaces, and a fluid
actuated ram for varying the degree of eccen
tricity of the eccentric, said ram being located
«withinA a boring in
'
direction at right angles to the axis of the shaft
a radial boring in the shaft, ‘a hollow ram slid
able in said boring with its lower end contacting
modated within
the eccentric and -meansV
pressure to said eccentric to cause same to move
the inner surface of
at right angles relative to the axis of said shaft. V30Y passing axially through the shaft and communi
cably connecting the interior of said hollow ram
2. In a hydraulic pump having a series of
cylinders and pistons radially arranged around a Y with the delivery side of the pump.
'
'
f ‘ c
shaft an eccentric in operative
5. A hydraulic pump as claimed in claim 1
common drivingwherein the anti-friction means comprise rollers
engagement with the shaft and in driving con
` between said plane surfaces, and means accom-`
the shaft for transmitting fluid '
`
Y
nection with the vpistons and means which is 35 mounted on -pins, and contactingrthe plane sur
responsive-to the innuence Vof tlie~fluidpressure
in the discharge side of the'pump for varying
thedegree of eccentricity of the eccentric-and
effective length of stroke of the pistons; the
provision of opposed plane surfaces on the shaft
and eccentric respectively, anti-friction means
located between said plane surfaces, and a fluid
actuated ram for varying 'the degree of eccen
facesoftheshaft.'
'
`
-Y
'
‘n
'
6. A hydraulic' pump as claimed in claim ‘1
wherein the plane surfaces of the eccentric are
formed by segmental blocks carried bythe ec- _
ycentric and are separated Vfrom the plane sur
facesof the shaft by needle-type bearings located
within slots in a cage.
‘
"
l'
7. A hydraulic pump as claimed in' claim 4
wherein said höllow ram. has an axially arranged
' tricity of the eccentric, said ram being located
the shaft and movable in‘ a 45 rblind boring and surrounding annular groove
within a boring in»
direction at right angles to the axis of the ‘sha-ft.
3. In a' hydraulic pump having al series of
cylinders and pistons radially arranged around
connected with said axial boring .by radially ar
ranged borings, and an axial passageway through
the shaft connecting said annular groove with
a common driving shaft an ecce 4tric in operative ~ 50 the delivery side of the pump.
engagement with the shaft and' in Adriving con
and Ymeans which is
lnection with the pistons
responsive to the influence of the ñuid pressure
in the discharge side of the pump for'varying
`
WARWICK yCLAUDE HOLDEN.
n JOSHUA CHALLINER NAYLOR.
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