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Патент USA US2406173

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Aug. 2o, 194e.
„v_-T; siTEPHENs
V2,406,173 ’
SERVOIOTOR AND CONTROL -THEREOF
4 Sheets-»Sheet 1
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sERvpMoToa AND coNTnoL THEREOF
Filed April 1e, 194:',>
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4 sheets-sheet 2
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Aug. 20, 1946.
w, T_ lSTEM-WENSv
2,406,173
SERVOMOTOR AND CONTROL THEREOF
Filed April 16, 1943
‘
`4 sheets-sheet 4l A,
147
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W. T. STEPHENS
_
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Patented Aug. 20, l946- y
2,406,173 ~
untreu STATES PATENT: OFFICE 4SERVOMOTOR AND CONTROL _'.liHEREOF
l William T. Stephens. Cleveland, Ohio, assignor to '
Hydraulic Control Engineering Company,
Cleveland, Ohio, a corporation of Ohio
'
Application April 16, 1943,'ser1a1No. 483,312
13 Claims.
(C1. 1214-41)
1
2
This invention relates‘toi a hydraulic control
system, and more particularly to a hydraulic sys
vtem and control valve thereforfespecially for op
therefor and a degree dial for'indicating the po
erating a pivoted control member such as an air
sition of the valves;
craft aileron, rudder and wing flap, or a vehicle
steering gear.
An object of the invention is to provide a hy
draulic control apparatus whereby the movement
of the pivoted member is positive in operation
without hunting or over control. The hydraulic
Fig. 8 is a fragmentary front elevation of the ,
control vvalve illustrating the .operating handle
l `
.
I
Fig. 9 is a fragmentary view partially in cross
section taken on line 9--9 of Fig. 8; and
.
'Fig l0 illustrates the double acting hydraulic
motor‘partially broken away to show the piston
andv piston rod construction,
.
Fig. l illustrates a diagrammatic lay-out of the
-hoist ormotor used for actuating the pivoted
system as a whole, showing- one‘manner of 'oper
member is of the double acting 'variety wherein
y ating the pivoted aileron or other pivoted surface.
hydraulic fluid under _pressure is introduced be
In this figure numeral I denotes the hydraulic
hind one side of the double acting piston and the
control valve coupled by suitable pressure lines to
hydraulic fluid on the other side of the piston is 15 a fluid accumulator 3, hydraulic‘fiuid supply tank
exhausted therethrough into a valve mechanism
5 and pressure pump 1 for maintaining the hy
provided with compartments or chambers of the
draulic iluid at a pressure suillcient tov operate
identical volumetric capacity as the portions of
vthe fluid motor 9. .As shown in the drawings,
thel motor cylinder on either side ofthe double
the hydraulic'motor'S may be coupled through af
acting piston.
'
_
f
'
20 chain _|85 or other power transmitting medium to
Another object of the invention is the construc
sprocket wheels, one of which has a shaft on
tion of the control valve whereby hydraulic iluid
' which the aileron or other surface II is secured.
is applied to either' side of the hydraulic motor
In addition to the novelty of the system for
to move the piston rod thereof to any desired de
controlling or moving a vpivoted surface, them-_
gree and to maintain this fixed position with aß'vention hereinafter described includes the hy
‘assurity‘ until the operator desires to change the
draulic- control per se designated by numeral I:
setting thereof. It will be appreciated by those
The control Valve as shown in Fig. 2 consists
in the art that it is essential that a pivoted lconof a center -rotatable valve plug I 5 mounted with
in a cylindricalrotor I1. . The rotor is supported
trol surface of an aircraft must be moved an ex
act amount so that there is no overor under 30 in spaced cylindrical bearings I9 and 2| having
movement of the pivoted member and that any
enlarged spaced annular flanges> 23 and 25 _re
tendency of the pivoted member to flutter must
spectively. These enlarged flange members are
be suppressed.
.
peripherally jointed by an enlarged cylindrical
casing 21.» The‘rear endfof the valve- defined by ,
»
In the drawings:`
-
Fig. 1 is a diagrammatic lay-out of the system, vat the cylinder bearing I9 is closed by a gasketed end
including the control valve, the hydraulic double ’
plate 29 while the rotor I'I is secured in the valve
actingmotor and the typical means of moving the
assembly by means of a set screw 3l whose inner
end rides within an annular groove 3U formed
Fig. 2 is a longitudinal, vertical, cross-sectional Y . adjacent the end vof the valve plug I5.
_
view of the control valve per se, taken on line 2_2 40 Rotative movement is ~imparted to- the inner
y valve plug I5 by means of a vertically extending
of Fig. 1 and showing the various fluid passages
pivoted member;
' '
therethrough `and the operatinghandle whereby
~ these passages‘are
. tive relation;
_brought into desired coopera
Fig. 3 is a transverse vertical section taken on
Fig. 4 is a transverse vertical 'section> >taken yon
une 4_4 ofFig. 2; ’
Fig. 5 is a transverse vertical section taken Aon
lineß-S of Fig. 2;
,
"
Y
Fig. 6 isa transverse vertical section taken on
line 6_6 ofFig.2:
'
'
.
y.
Fig. '7 is a horizontal cross-sectional view taken
on line'l-Íl of Fig'. 2 at the rear-portion' of the
i
valve;
flange 35. The outer periphery of this flange is
supported'within theouter end of the -leftïhand
cylindrical' bearing 2I with an annularseal 31
abutting the flange 35 for the purpose :of forming
« line 3--3 of Fig. 2;
I
handle 33 having an-annular inwardly-'extending l ,
'
a hydraulic seal. As shown. the lower portion of,l ~-
the handley 33 carrying the inwardly- extending
flange is. bolted to the'y rotary plus l5. LYins'be-ç. Q '
tween the outer `end'oi' Íthe cylindricalbearing'ZI V i y j
and the nat portion ÍoIf the handle and ,surround->
ing the ilangeilis adialplate `45 having an arcu
ate slot.“ therein to provide a lost motion> con
nection, as will 4be hereinafterdescribed. yThe-
dialplate 4I is loosely mounted on the outer sur-> i.’ f
, y "
5 2,406,178
a
~.
~
3
4
,
l
face of flange 35. Pin 4| ' amxed to the inner ,
The radial passages |00 and I|5 which lie in
surface of `the'handle 33 extends into the arcu
ate >slot 43 of dial plate 45. Directly above the
spaced, parallel relationship to passages 85 and
91 are also diametrically opposite and join bores
arcuate slot the dial plate' is turned at right an- .
y99 and III, respectively, to the outside of the '
gles to form a-taperedl pointer 41 having a groove
valve plug I5. Radial passages |39 and |43 ly
ing in spaced parallel relationship to passages 85
or guide line therein for registering with suitable
indicia' carried by the dial ring 39.
As shown in detail in Figs. 2 and _4, the cen'
tral portion of the control valve lying between
the enlarged flanges 23 and 25 is provided lwith
a lower cylindrical ñller segment 55 that is held
in fixed relation with the cylindrical casing 21
by means of keys 51. _'I‘he enlarged central part- .
and 91 and |00 and I|5 are also positioned dia-metrically opposite to each other and join bores
III andIOI, respectively, to. the outside- of the- '
valve plug I5. ABore III is plugged at its outer
end by screw plug ||3. This series of bores and
passages together with the previously described
bore 8| and its associated passages 19 and 85
. of the rotor I1 is supported by and has a close fit ' ' make up the fluid passages through the-valve
with this cylindrical segment 55.
The rotor
also carries a baille or abutment 53 keyed there
in and dividing the upper open chamber between
the side edges'or stops 59 and '6| of the cylin
dricîal segment 55. When the rotor I1 is ro
tated to the right or left
by the edges 59 and 6|.
vided with longitudinal
adjacent the rotor I1
its movement is arrested
The member 55 is pro
iiuid grooves 63 and 65
and formed below the
-oblique stop surfaces 59 and 6|. Hydraulic fluid'
from the accumulator 3 enters the control valve
through inlet 69 (Fig. 3') having a horizontal
passage 1| ~passing through the bearing wall I9
plug I5.
.
In rotor I1 lands ||9 and.|2| (Fig. 4) separate
the ends of the circumferential grooves I|1 and y
respectively.
| I1’ and normally
The iiuid
block passages
passages |23
I I5 andvl00,
and |25
communicate with grooves ||1 and |I1’ and
chambers |15 and |11, respectively, of the valve
motor.
„
Passages |39 and |43, Fig. 6,) of the plug I5
register with the annular groove |33 of rotor I1
and passage |31 joins this groove with the out'
side of rotor I1 and is in communication with y
the annular groove |35 formed in the _bearing
I9. Passage |45 leading from groove |35 through
the wall of` the bearing I9 terminates in a`
any positionl the annular groove 13 permits iiuid 30 threaded port |41 for connection through suit
to. pass through radial passage 15 in the rotor I1
able piping with ñuid supply tank 5. The grooves
to an annular groove 13 also formed in the cylin
drical bearing I9. When the control valve is in
and thence to circumferential groove 11 _formed
inthe rotor and thus circulate to radial passage
81, 81'; 89, 89'; II'I, II1’, 11 and |33 together
with' passages 95, 95', |23, |25, 15 and |31 form
the fluid circulating means through the rotor
central longitudinal bore 8|. The longitudinal ' | 1. Grooves 13 and |35 together with passages
bore 8| `is blocked at the rear of the valve by a
1I and |45 and ports 69and |41 are the iiuid
screw plug 83 while the forward end of the bore
circulating means through the outer bearing I9.
leads to radial passage 85 (Fig. 3) which is nor
. The operating motor 9 is of the double act
mally blocked by land 9|, which is formed on the
ing type and consists of an outer _casing |59
rotor I1 between the upper ends of the semi 40 which houses reciprocating piston- I6I fastened
circumferential' grooves 81Í and 81'. The lower
to oppositely extending piston rods |61 passing
spaced ends of these semi-circumferential grooves 'A through the outer removable ends |69 fastened
. 19 formed through the valve plug I5 leading to a
are supported by land'93.
'I‘hese semi-circular '
securely to the casing |59. The piston |6| divides ,
grooves 81 and 81"open into radial passages 95
the _motor 9 into two chambers |63 and |65 whose
and 95' leading to a second set of semi-circum 45 combined volume is equal to the combined volume
À ferential grooves 89 and 89' formed on the outer
of the chambers |15 and |11 yof the valve motor.
periphery of the rotor I1. ¢The upper and lower
These valve motor chambers |15 and |11 are
ends of these grooves 89 and 89’ terminate on
so constructed that when one of the chambers
opposite sides of lands 9|’ and 93' respectively.
is expanded or enlarged by movement of plug
Ports |29 and |21 join grooves 89, and 89' re 50 I5 it causes the otherchamber to be contracted
spectively with the outside of >bearing 2| and thus
a similar amount.`
allow for fiuid` connections to `the motor cham
bers |65 and |63, respectively, by means of iiuid
|65 and' |63 are similarly constructed.
lines |51 and |55.
rotated to allow passage. of high .pressure iiuid
'
'
vOperating motor chambers
»
In operation the valve plug I5 is manually
In addition to the bore8| the --valve plug I5 55 to one side of the motor 9 and the exhaust fluid
houses longitudinal bores 99, |0I, |05 and -|||.
from-the other side of the motor .piston is uti
'l' One end of the bore '99 is screwthreaded to re
lized to move the rotor I1 to close olf the flow of
ceive one of the holding screws vfor securing the
fluid. Because' of the volumetric equality be-`
operating >handle 33 to the valve plug I5 with
vtween the valve motorA and the operating motor
the opposite end of the bore 99 terminating in 60 and the relationship of the chambers in each of
a reduced diameter bore portion |05 which in
these motors it will be evident that the introduc
turncommunicates with an enlarged diameter
tion of ñuid into one side of the motor 9 causes
bore |0I. The bore IOI is plugged at its outer
the introduction of an equal amount of 'fluid into
end by screw plug |03 and also houses check
the valve motor to cause rotation of the rotor I1.
valve |01 and its associated spring |09 which 65 By knowing the total displacement of the motor
normally presses the check ball |01 into engage
9 and the amount of angular movement of both ,
ment with the end of reduced diameter bore por
surface I| and rotor I1 as a rezult of su‘ch dis-v
tion |05. This check ball |01 isset to open at a
placement itis a comparatively simple matter to
pressure in excess of that needed for operation
calibrate the angular movement of the surface
of the controls although this pressure is some- 70 II in relation to the angular movement of the
what less than the accumulator pressure.
rotor I1 and thus determine the marking of dial
The radial` passage 91 joining bore 99 with
_ring 39.
.
l
'
the outside-of the valve plug I5 is in the ’same
vDue to the construction of valve plug I5 and
plane and spaceddiametrically opposite from .the
rotor' I1 as shown in sections 3-3 of Figures 2
radial passage 85 communicating with bore 8|. 75 and 3, it will be appreciated that when plug I5 is
2,406,178 `
Inasmuch as the motor and system are illled
with iluid, the oil exhaustedfrom left hand cham
ber |55 will be" forced through conduit |51
rotated, some fixed angular amount of high pres- i
sure fluid will now to one Aside of motor 9 until`
the exhaust fluid from the opposite side thereof
will cause rotor I1 (Fig-‘4) to move a sumcient .
'
through‘port |29 and passages _39, 95, 31, 91, 99,
|00, |I1 and I23.to the _left hand `rotor chamber
amount to close oi! the high pressure fluid ñow.
|15. ' The iluid‘thereupon rotates the »rotor I1
Since both plug I5 and rotor I1 have a common
and abutment 53 to the right. The exhaust oil
center of rotation it is apparent that rotating
' from right hand chamber |11 then passes back
valve 'plug I5 a given angular amount will pro
tothe supply pipe via passages |25, II1’, H5,
duce a similar angular movement oi' rotor I1_ if
passages 35 and 91 are of the same width as lands 10 III, |39, |93, |31, |35, |45 and port-|41. The ro
tor I1 will thereupon turn to the right until the
9| and 93. However, since these lands -are wider
'for sealing purposes than the passages, plug I5 \ fluid passage 951s again blocked by the land 9|'.
When this occurs, hydraulic fluid cannot longer
- must be rotated an additional amount to provide
flow to themotor and consequently movement
for the necessary over travel.. This is ,compen
sated for in the indicator by means of pin 4I 15 thereof is arrested. At the time passage 91 is
blocked by land 93, _passage I I5 is blocked by land
and slot 43 and the amount of angular movement
I I9 and passage |00 by land |2I so- that all ñow
' of surface I I can .be determined directly -by means>
of fluid to and from the hydraulic motor ceases
of the setting of pointer" on dial ring 39 when
and as the rotor I 1 is stopped the system comes to
the valve plug is rotated. However, this is true
only if the valve motor and operating means are 20 rest with the aileron or other control -surface
depressed to 45° from its horizontal position.
in synchronism and the method of obtaining this
To return the control surface to its original ’
synchronized relationship will be explained in
position handle 33 is moved to the left. The ini
tial movement in this direction takes up the over
. -|I5 are all in the same longitudinal plane and 25 -travel of valve plunger I5 and after this has oc
detail hereafter.
_
It will be noted that passages 85, 91, |00 and
curred passage 85 is put to. communication with
passage 81. ` At this point the pin 4| abuts the
lands 9|, 93, I|9 and |2| are in the same plane
end
ofthe arcuate slot 43 in the plate 45-and thus
of rotor I1 and are~ of substantially' the same
the plate 45 is picked up and thereafter moves
magnitude. hence any movement of the valve plug
the lever~33 until the plate and -its asso
I5 which will uncover one of these passages from 30 with
ciated
pointer indicates zero on the scale plate.
its land seal will simultaneously uncover the other
Fluid
pressure
is still available at the ends of
of said passages and conversely any movement of
are of substantially the same width. Similarly
rotor I1 whichv causes a land to cover and seal
one of these passages will cause all of them to be
sealed.
‘
`
,
passages 8I-85 as previously described and will '
ñow to the left hand motor chamber |55 by way
-35 of passages 81, 95 and 89, port |29 and conduit
Inasmuch as the flow of fluid .through the valve
is simultaneously in several'directions and at sev
eral levels attention is particularly directed to~
the cross-sectional views illustrated in Figs. 3,
|51 thereupon .forcing motor piston IBI »toward
I the right to raise the aileron'. Exhaust oil from
the right hand chamber |53 is forced into the '
right'hand rotor chamber I11_by-way of line |55.
|21 and'passages 89', 95', 81', 91, 99, |00,
4, 5, 6 and 7. Fig. 5 is the entrance level where 40 _port
|I1’ and |25 whereupon rotor |1 and the abut
the high pressure _fluid from4 the accumulator
ment 53 are moved to the left. Exhaust oil from
enters the valve assembly I. Fig. 3 is the valve
the left'hand chamber |15 of the rotor is pushed
level where the high pressure _fluid il'ow to the
back to the supply tank 5 via passages |23, I I1,
operating motor 9 is controlled together with
II5, 'I||, |39, |33, |31 and |35 to port |41.
thev return i‘low vfrom the motor. Fig. 4 ls the
Movement of the rotor I1 will thus continue to
valve motor level where the ñow of exhaustfiuid
`the left until the passages 85, 91, |00 and ||5
from motor 9 4to the valve motor is controlled and
are closed or blocked ‘by lands 9|, 93, I2| and I I9
also the return flow from the valve motor back '
respectively, thus arresting any further ilow of
tothe supply tank 5. Fig. 6 as supplemented by
‘~
Fig. '7 shows the return level which includes the 50 fluid.
When this condition has been effected rotor I1
exit port for fluid leaving the valve and return
and motor piston |6I will be in their neutral or
ing. to the supply tank.
mid positions whereupon if the handle 33 is now
When it is desired to lower the aileron orother
moved to the right until the pin 4I bisects the
control surface to any desired degrees as, for `
center line of slot 43 in plate 45 the respective
55
instance 45°, the control lever 33 is rotated to
positions of the valve and system will be in
the right until the pointer 41 registers with the
identical position to that assumed at the start
45° mark'on the scale. It will be noted that the
of the control operation. This last movement
pin 4| carried by the operating lever of handle
to
the right of lever 33 will produce no movement
33 does not connect with or pick up the plate 45
of
either the piston IBI or rotor I1 _as it merely
carrying the pointer 41 until the valve plug- I5 00 reestablishes
the valve plunger I5 to its original
fastened to the lever 33 has moved through the
starting position with the passages 85 and 91
distance of the slot 43 so that the pointer does not
centered on lands 9| and 93 respectively.
start to register on the scale until the valve plug
While this latter position of the valve plunger
I5 has moved suillciently to bring the fluid pas
I5 contributes nothing. to the operation or move
- sage 85 into communication with passage 81'
ment of the aileron while the'alrcraft is in flight,
thereby taking up the lap or overtravel. With
it d_oes provide a positivemeans _of sealing the
the pointer 41 and valve plug I5 rotated to coin
hydraulic fluid in the system when theaircraft
cide with the 45° scale marking the high pres
is on- the ground and the pump 1 >is not in oper
sure hydraulic fluid will'then flow from the
ation. The overtravel or lap provided by lands
accumulator 3 to the passage 85 as above' de
9|, 93, |I9 and also |2I preventsflutter of the
scribed and continue to the motor 9 by way of
-Ipassages 81', 95’, 89', port |21 and conduit |55 to
the right hand chamber |53 of the‘motor where
the fluid will force the double acting piston |5I
75
to the left thus lowering the surface II.
aileron when the ship is in flight by allowing
overtravel of the rotor I1 when coming up to the
stop'position. The lands being wider than the
diameter of the passages they block, prevents the
2,406,173
slight overtravel of the rotor I1 from producing
a reversal of flow of the hydraulic liquid and
thus the flutter condition caused by such reversal
is eliminated and a dangerous and undesirable
condition
avoided.
.
l
-
To raise' the aileron above its horizontal posi
tion the pointer plate 45 and pointer 41 are moved
to the left through the medium of the handle
33 to the desired degree of elevation a's indicated
on the scale 39. . High pressure fluid thereupon
part 55 before the piston 6I reaches the end-of
the motor cylinder. With the pointer 41 set at`
>the timing mark rotor I 1 will come to rest againstvr
part 55- without closing 0E passages 85,` 91, |00'
or I|5 and fluid will continue to flow to the
' chamber |63 and, also, to chamber |15. However,
if the‘chamber |15 isfilled with fluid the pres
sure vthereof in passage 99 will be sufllcient to
lift the check ball |01 from its seat and the fluid
10 released will flow back to the supply tank 5 by
fiows from passage 85 through passages 81, 95,
and 89, port |29 and conduit |51 to the left hand
motor chamber |65 and forces piston |6| to the
right thus elevating the aileron. Exhaust oil
from chamber |63 is moved by the operation of
the piston through line |55, port |21, passages
way of passages |05, IOI, |43, |33, |31, |35, |45
and port I 41 until the motor piston I6| reaches
thel end of. its stroke, -thus cutting oif the supply
of fluid goingv to passage 99. Since both motor
piston I6| and rotor I1 are now at their extreme
positions they are again in time and any move- «
hand rotor chamber |11 whereby the rotor I1
mentofpiston |6| will produce a correspondingmovement lof rotor I1 if the valve plunger I5 is
and its abutment 53 are rotated to the left. Ex
rotated to permit 'such movement.
89', 95', 812.91, 99, |00, ||1' and |25 to right
haust ñuidfrom chamber |15 is forced back into
the supply tank 5 by way of passages |23, ||1,`
||5, III, |39, |33, |31, |35 and |45 to port |41.
_'
By providing .air bleeder valves or cocks I8|
r and |83, in motor chambers |65 and |63, the
control valve and ñuid ïmotor may be filled with
oil regardless of the relative positions of the
The motion of the rotor I1 is arrested when it
piston"î.„|6|- and rotor I1. To initially illl the
catches up with valve plunger I5 and lands 3|,
93, ||9 and |2| block the ñow of oil from pas 25 valve and motor, or to add additional fluid there»
sages 85, 91, ||5 and- |00 respectively.
L
to, all connections to the accumulator, `tank and
motor are made and the system is filled by alter
Since the fluid'circuit just described is iden-4
nately moving lever 33 to the right and left tim
tical to the circuit necessary to raise thé aileron
ing positions several strokes. If it is assumed
or other control surface from its lower or de
pressed position back to its horizontal or neu 30 that the rotor abutment 53 is to the left of its
mid position when ñlling operations are started,
tral position, it is evident that to raise the aileron,
then, when lever 33 is moved to the left until it
the handle 33 must be moved to the left and to
reaches the left timing position, high pressure
lower 'the handle must'be moved to .the right.
fluid will flow from the accumulator to the mo
The position that the aileron will assume4 when
it comes to rest can always be accurately deter 35 tor cylinder as has already been described. By
mined by observation of the position of the - keeping the air bleeder 'IBI of the chamber |65
pointer 41 registering on 'the scal’e plate 39.
open until a solid stream of iluid appears all
' Before taking ofi’ for a flight or putting the
` _ system into voperation~ it is. essential that the
air between the accumulator and the left-hand '
chamber |65 will be exhausted and' replaced with
operator be sure that the control apparatus is 40 fluid. Piston |6| will also be moved to its ex
treme right position forcing air from right-hand
in time as occasionally the motor piston |6| is
not precisely synchronized with the rotor I1. ' chamber |63 to the right-hand valve chamber
|11. Inasmuch as air is compressible, the abut-v
l, To ascertain if the motor and control» valve are
ment 53 may or may not be moved to its extreme
in proper timed relation the operating lever 33
` should always be moved to both the right and 45 left stop position as a result of the air being
left extreme positions.
If it is found that the
piston I6I and the rotor I1 are not in timed rela
tion, the movement of the lever to the extreme
right and leftpositions two or three times will
retime or synchronize the apparatus in the fol 50
forced into chamber |11.
However, any move
ment of the-'abutment 53 to the left' will force
some ofthe air in the chamber |15 and the con
necting ñuid‘passages back into the supply tank.
When lever 33 is now moved to the right timing
Assuming that the piston '|6I
position, fluid will flow to the right-hand motox`
has moved to the right without a corresponding
movement; of the rotor I1, then, if lever 33 is
pushed al1 the way over toward the left until the
chamber |63 in the manner previously described
- and, by opening the bleeder |83, all air between
the right side of the piston |63 and the accumu
i lowing manner.
pointer 41 registers with the “time” position on 55 lator 3 will be exhausted and replaced by
fluid. Piston |6|4 is, consequently, forced to the
the scale 39, hydraulic ñuid will iiow from the`
accumulator 3 to the left-hand chamber |65,- left. until its stop position is reached and the
i forcing piston I6| to theright, and moving fluid
fluid in chamber |65 and the lines and passages
1 from chamber |65 into valve chamber |11, while
‘
l
,
.
' to chamber |15 is forced into the chamber ñll
the iiuid from chamber|15 is forced back to the 60 ing it with -a measure of fluid and air which
supply tank 5. Since motor piston I6| is out of
tends to move vtofth‘e lright but, due to the com
pressibility of the air, the rotor I1 may or may
time. but, being ahead of the rotor I1, when mov
not reach vits right stop position. Whatever
ing toward the right, the piston will reach the
¿ end of its travel without having displaced suiil
movement takes place forces some of the air out
‘ cient fluid to push rotor abutment 53 to its left 65 of the chamber |15 through the connecting
hand stop 59 on .part 55 and, thus, the rotor I1 ' passages back to the supply tank and it will be
will still be out of time with the piston I6I.- If
, the lever 33 is now pulled over toward the right
understood that after this first right and left
cycle is completed the system is full of fluid ex
>until the pointer 41 lines` up with the right
cept for the valve chambers |11 and |15 and „
l timing position on the scale, fluid will 'then iiow 70 connecting passages to the supply tank as ~they
i from the accumulator 3 `to right-hand motor
` chamber |63, forcing piston I6| to the left and _
ï moving .the exhausted fluid to left-hand valve
i chamber |15. _Rotor I1 now leads the piston |66
now contain a mixture of ñuid and air.
'I'he
second cycle of vvleft and ri’ght movement of the
lever 33 will force the air and :duid mixture out
of the chambers |11 and |15, together with their
‘ andthe abutment 63 will come to its stop 6| on 75 connecting passages, back to the tank and the
2,408,173
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A servo-motor control~k system for- use Ã- with ’
`a source o! liquid >under pressure including in
air and -:lillid mixture lwill be replaced by fluid
alone. A third cycle of operation to the right ~
combination; -a double-acting" servo-motor lhav
ing two alternatively filled and emptied cham
and left will serve to put the various parts of
the unit in timed relation ii they are not already
bers, a control valve having a'iirst element mov
able to open position to selectively connect one
of said chambers to said source, a` second ele-.
position, when lever 33 is moved to the left
f ment cooperating with the ilrstrto provide follow
.timing position, high pressure iluid from the ac
up to close saidcon'nection, a double-acting valve
.'cumulator will illl chamber liiilrst and >repeat
the previously described conditions. Should the 10 lmotor connected to move said second element,
said .valve motor having two chambers each 'at ~
ilrst movement oi the leverV 33 be to the right
least as large in all corresponding displacements
instead of to the left the system would be again
_in this condition. Ii we now assume that abut
» ment I3 of the rotor is to the right oi its mid
"as the corresponding chamber o! the servo-motor
and adapted to be alternatively illled and
scribed except that chamber IGI would be ñrst
filled due to the reversed flow o! fluid from pas 15 emptied, means including a portion of said valve
_for connecting the discharging chamber of said
, sage 85. Similarly, the timing operation may
servo-motor to that chamber ot the valve motor
be started >to the right position instead of the .
which moves the follow-up element toward valve
.left position and the desired results accom
'closing position, and means in said valve to con
plished.
_
' iilled with iluid in the manner previously de
' 20Jtrol the discharge from the other chamber of
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the valve‘motor while preventing discharge from _
1. In a hydraulic control system for use with a
the _ñlling valve-motor chamber;A
source of high pressure liquid, in combination, a
5. A servo-motor control system for use with
double-acting servo-motor having'similarV liquid
a source of liquid under pressure including in
displacement at the two ends thereof, a control
I claim:
valve element movable to selectively deliver high 25 combination, a servo-motor having a piston
c pressure liquid directly to either end of the mo
separating oppositely expandible chambers , a
livery whereby said follow-up is instantaneous.
follow-up element toward valve closing position
multiple control valve including a ilrst element
tor, ‘a double acting valve. motor having two
movable to selectively connect one of said cham
chambers, a second valve element associated for
bers to said source, a second element cooperat
movement by said valvemotor and providing a
follow-upl for- the ilrst valve element, means to 30 ing with _the ñrst to provide follow-up, a valve
motor connected to move said second'element
deliver all of the liquid discharged from the in
and having a piston separating oppositely ex
active end of the servo-motorto that chamber Y
pandible chambers, means including a portion
of the valve motor which will cause movement
of said valve for simultaneously connecting the
of the follow-up valve element to close oi! flow to
the servo-motor, and means to maintain said 35 discharging chamber oi' said servo-motor to that chamber o1' the valve motor which moves the
last mentioned chamber closed during said-de
2. A servo-motor'control system for use with
a source oi liquid under pressure including in
combination, a double-acting servo-motor hav
ing two alternatively filled and emptied cham
and means to cause said follow-up to act in uni
son with the movement of the servo-piston.
¿o 6. A servo-motor control system- for use with
_a source of liquid under pressure including in
combination, a servo-motor having a piston
bers of like iluid capacity, a control valve hav
kseparating »oppositely expandible chambers, a
ing a i‘lrst element movable to open position to
multiple control valve including a ñrst element
selectively connect one of said chambers to said
source, a Asecond element cooperating with the 45 movable to selectively connect one of said cham
bers to said source, a second element cooperat
ñrst to provide follow-up to close said connec
ing with the iirst to provide' follow-up, a valve
tion, a double acting. valve motor connected to
motor connected-tomovesaid second element
move said second element, said valve motor hav
and having a piston-"separating oppositely ex- '
ing two chambers adapted to be alternatively
-pandible chambers, means inclugling a portion of
filledV _and emptied and means including said -
said valve for> simultaneously connecting that
valve for connecting the discharging chamber
.chamber oi the valve "motor which moves the
of said servo-motor to the chamber _of the valve
motor which moves the follow-up element toward _ _'
' valve closing'position, said‘means preventing dis
charge from the valve-motor chamber while it is
filling to provide instantaneous ,follow-up.
4follow-up element toward valve closing position
to' receive and hold the wholeëfdischarge from
. the inactive chamber of the ‘servo-"motor 'to pro
vide synchronous follow-up.
3. A servo-motor control system for use with n '
a source of liquid under pressure including in
combination, a double-acting servo-motorhav
ing two alternatively filled and emptied cham
60
bers, a control valve having a first element
movable to open position to selectively connect
one of said chambers to said source, a second ‘
element. cooperating with the first to provide
follow-up to close said connection, l adouble
acting valve motor connected to move said sec
ond element, said valve motor having two cham
bers each at least as large in all corresponding '
.
7. A servo-motor control _system for use with
a‘ source of liquid under pressure including in
combination, a servo-motor having a piston sep
arating alternatively expandiblèívchambers, a
control valve including a first element movable` _
optionally through and beyond- `the distance
necessary to connect either of said? chambers to ~
fsaid source, a second element cooperating with
the ilrst to move through the selected distancel
' to provide follow-up to close said connection, a
valve motor connected to move said second ele
ment and having a'piston separating alterna
displacements as the corresponding chamber of
expandible chambers each at least of the
the servo-motor Iand adapted only to be alter-‘ 70- tively
same maximum volume as the ’corresponding
natively ñlled and emptied and means including
motor chamber; and means for connecting
>a. portion of said valve for connecting the dis
that chamber of .the valve motor which moves
charging chamber- of >said servo-motor _to that
the follow-up element toward valve closing posi
chamber of the valve tmotor which moves the
follow-up element ltoward valve closing position. 75 tion to receive and hold all of the liquid dis
2,406,173
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charged from the inactive chamber of the~ servo
motor.
8. A servo-motor control system for use with
a source of liquid underv pressure including in
combination, a servo-motor having a- piston
vane on said sleeve, said valve- motor having two
chambers between said -vane >and abutments
adapted tobe alternatively iilled and emptied,
means including ports forming part of said valve
> for connecting the discharging chamber of said
separating alternatively expandible chambers, a
servo-motor to the chamber of the valve motor
which' moves the follow-upelement toward valve
control valve including a ñrst element movable
optionally. through and beyond the distance
closing position,»means to limit the movement/of
necessary to connect either of said chambers to
the valve motor in each direction and -a relief
said source, a second element cooperating with
.valve so„in’corporated in the system'as to vent
the emptying chamber Vof the servo-motor if the
valve motor reaches its limit of movement ñrst
the first to movethrough the selected distance
to provide follow-up to close said connection, a
valve motor connected to move said second ele
ment and having a piston separating alterna
tively expandible chambers each at least' of the 15
as a result of being not synchronized with the
servo-motor, whereby-synchronism is restored.
. 1l. The system of claim 10 wherein the relief
same maximum vvolume as the corresponding
valve is a single valve in the central valve ele
motor chamber, means forconnectlng the dis
ment so arranged as` to always subject'to the
charging chamber of said servo-motorA to that
pressure tending to move the valve-motor.
‘ chamber of the valve motor which moves the
l2. Al servo-motor control system for use with
follow-up. elementv toward valve closing posi 20 a. source of liquid under pressure and a‘supply
i tion each'of saidy valve-motor chambers having
tank including in combination, a double act
1 but a single iluid passage, and means associated
ing' servo-motor having two alternatively filled
with the ñrst valve element to designate the
and emptied chambers, a control assembly in
î extent of movement of the servo-motor piston
cluding avalve having a central cylindrical ele
fment rotatable from normally closed to open po
element.
sition to selectively» connect one of said chambers
9. A servo-motor' control system for use `with
to said source, a second valve element compri/s
a source of liquid under pressure including in
ing a- sleeve surrounding the ñrst element and
cooperating with the same to provide follow-up
combination,.a double acting servo-motor hav
ing a. piston' separating two alternatively filled 30 to resume normal closed position, a double act
and emptied chambers, a control assembly in
ing valve motor comprising an arcuate housing
cluding a valve having a central cylindrical ele- ‘
having abutments and a vane on said sleeve, said
‘ resulting from any particular setting of said
`
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i ment manually- rotatable to open position to
valve motorl having two chambers between said
selectively connect one of said chambers to said
vane and abutments‘adapted to be> alternatively
ï source, a second valve element comprising a 35 i-llled and emptied, means including- ports form
sleeve surrounding the ñrst element and co
operating with the same to provide follow-up to `
ing part of said valve for connecting the dis
charging chamber of said servo-motor to the
close said connection, adouble acting valve mo
chamber of the -valve motor which moves the
l tor comprising a housing having abutments and
follow-up element'towa?d valve closing position
a vane on said sleeve, said valve motor having 40 and to connect the discharging ~chamber of the
ï two chambers between said vane and abutments `
adapted to be alternatively vfilled and emptied
"and means including ports forming part of said
valve motor to said tank when the ñrst valve
element is moved from normal position.
13. Valve means for use with a servo-motor
i valve for connecting the discharging chamber
control system including in combination a mul
of said servo-motor to the chamber of the valve 45 tiple control valve having a manually movable
ï motor which moves the follow-up element towar
element assembly and a ñxed element, passages
in said element and assembly adapted for align
ment to- conduct fluid, said members when in
a source of liquid under pressure including in
“oiï” position having lap to prevent leakage, a
combination, a double acting servo-motor hav 50 scale part, a pointer part tocoopera-te with said
ing a piston separating two alternatively ñlled
scale to indicate the actual amount of relative
and emptied chambers, a control assembly in
movement of -said parts after said lap has been
1 valve closing position.
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10. _A servo-motor control system for use with.
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cluding a valve having a central cylindrical ele- .
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passed, means securing one of said parts to a
ment manually rotatable> to open position to
stationary portion of the` valve, and means pro
selectively connect» one of said chambers to said 55 viding a lost motion connection for the other
source, a second valve element comprising a
part to said movable valve element, the amount
sleeve surrounding the first element and cooper- `
of lost motion provided being just su?licient to
ating with the same to provide follow-up to close
compensate _ for said lap.
`said connection, 4a double acting valve motor
' \ comprising a housing'lhavilng abutments and a 60
WmJAM T. STEPHENS.
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