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Oct. 29, 1946.
I. ' v.. FALKV
2,410,155
PROPELLER GOVERNOR TES TER
Filed May 15, 1,944
2 Sheéts-Sheet '1
1.9
I!
I 100
_
4:;
‘
'INVENTOR.
'
?mVV/ihx,
BY- Ma=
2777019446715.
Patented Oct. 29, 1946
' 2,410,155
UNITEDSTATES PATENT OFFICE
PROPELLER GOVERNOR TESTER
Irvin V. Falk, Union, N. J., assignor to Reeves
Pulley Company, Columbus, Ind., a corporation
of Indiana
Application May 15, 1944, Serial No. 535,693
14 Claims.
.
1
.
(Cl. 73—1)
.
2
The present invention relates to a propeller
-
.
~
each provided with a ?nger underlying a disc
l3 (see Fig. 3) at the upper end of a reciprocable
governor tester, and is disclosed in connection
with a commercial governor designed to adjust
valve body I4 which is urged, by a spring I5,
the pitch of an airplane propeller to optimum
toward the position illustrated in Fig. 1. A
positions for varying, conditions of aircraft op
plunger l6 constitutes an abutment for the up
eration. The governor disclosed is of a type
per end of spring l5, and said plunger is pro
which, in response to variations in engine speed,
vided with rack teeth I‘! meshing with a pinion
l8 adapted to be adjusted by manipulation of a
controls the rate and direction of ?ow of ?uid
(oil, in this case) ‘to a piston connected to ad
hand wheel, or the like, I9, (Fig. 1) whereby‘ to
just the propeller pitch, so that an increase in 10 adjust the position of the plunger l6 and the
engine speed will result in an increase in the
degree of pressure exerted by the spring I5 upon
“bite” of the propeller, thus increasing the load
the disc l3. It will be obvious that such adjust
'on the engine to retard the engine; and vice
ment of the plunger 16 will vary the speed of
versa.
the rotor H at which the ?yweights l2 will as
The present invention is not concerned with 15 sume the “on-speed” position of Fig, 3. '
~ »
the propeller adjusting mechanism, or with the
The governor mechanism includes a ‘gear typ
construction of the governor; but with a test
pump 29 adapted to discharge ?uid through a
stand comprising mechanism for simulating en
passage 2| to a passage 22, one end‘ of which
gine conditions, and impressing speed changes
communicates, through a valve 23 biased to closed
upon such a governor, the stand being so de 20 position by a spring 24, with a passage 25 for a
signed as to respond to the operation of the
purpose later to be described.
- 1
. governor mechanism to vary the rate at which
The valve I4 is reciprocably mounted‘in a
the governor mechanism is driven in response to
bore 26; and, near its upper end, said valve is
the demands of that mechanism. A further ob
formed with a port‘ 21 adapted, under “under
ject of the invention is to provide a test stand 25 speed” conditions, to register with a passagee28.
of the character described which shall be highly
The port 21 communicates with a bore 29 which
?exible, so that it may be adapted to the testing.
opens into the bore :26. The valve body His
of various forms of governor mechanisms.
further formed, intermediate its ends, with a
To the accomplishment of the above and re
reduced section 30, providing a circumferential
lated objects, my invention may be embodied 30 space which, in the “over-speed’? position of Fig.
in the form illustrated in the accompanying
4, establishes communication between‘ the pas
drawings, attention being called to the fact, how
sage 22 and the passage 28.v
ever, that the drawings are illustrative only, and
In the position of Fig. 3, all ?ow passages are
that changes may be made in the speci?c con
sealed from each other, except that the pressure
struction illustrated and described, so long as the . 35
scope of the appended claims is not violated.
Fig. "1 is a diagrammatic illustration of my
test stand with a commercial governor mecha
nism associated therewith, parts being broken
- away or shown in section for clarity of illustra
tion;
'
‘
produced by the operation of the pump 20 will
depress the valve 23‘ against the tendency of‘the
spring 24, thus moving the valve23 to the posi
tion illustrated in Fig. 3, to establish a ?ow cir
cuit from the pump outlet 2! through passage
40 22, valve 23, and passage 25, back to the pump
inlet 91.
.,
-
' Fig. 2 is an enlarged‘section through a detail
‘ In the “under-speed” positionrof Fig. 1,-the
_ of the test stand mechanism; and
Figs. 3 and 4 are sectional views of a governor
port 2'! registers with the passage 28 vto permit
?uid to ?ow from said passage 28 through the
mechanism in various positions of adjustment. 45 port 2'! and bore 29 to the bore 26. In the “over
’ In- Fig. 1, the reference numeral It] indicates
speed” position of Fig. 4, a ?ow path is established
generally a commercial form of governor mech
from the pump outlet 2| through the passage .22,
anism primarily constructed for the automatic
past the reduced section 30 of the valve l4, and.
control of controllable pitch aircraft propellers.
to the passage 28. The effect'of these various
The governor mechanism is illustrated, in Fig. 1, 50 positions upon the parts of the test stand, and
in “under-speed” position. In Figs. 3 and 4,
the results thereof upon the parts of the governor
the mechanism is illustrated in, respectively, “on
mechanism will become apparent as the descrip
speed” and “over-speed”.positions.
The selected governor mechanism comprises a
tion
proceeds.
'
--
'
The test ‘stand includes an electric motor 3|
rotor ll carrying centrifugal ?y weights [2, i2, 55 upon the spindle 32 of which ismounted a vari
2,410,155
3
4
and are well known in the art, an example being
shown in the patent to E. Martin, No. 2,264,089,
issued November 25, 1941; and therefore such
details are not speci?cally disclosed herein.
and a mating coned disc 35 axially sh‘ table rela
Suffice it to say that, in view of the illustrated
tive to said spindle 32. The shifting mechanism
connection, it will be clear that the pump 20 and
for said disc 35 comprises a thrust bearing 35 to
the rotor ll of the governor mechanism iii will
which is operatively connected a yoke 3i adjust~
be driven at varying speeds corresponding to the
ably mountediupon a stem 38 reciprocably car
speeds of the shaft 5! resulting from adjustments
ried in ‘a guide sleeve '39. A lever iii is pivotally
mounted at M upon a bracket carried by said 10 of the lever till to shift the disc 35.
The test stand includes an oil reservoir 64% from
guide sleeve 39, and is operatively connected to
able-effective-diameter pulley, indicated gen
erally by the reference numeral 33. Said pulley
comprises a coned disc 34 ?xed to the spindle 32,
cause reciprocation of the stem 38 in response to
which leads a supply pipe 65 connected to the
inletof a gear type pump 66 driven by the shaft
oscillation of said lever it. The lever it carries
extension ‘6'! ‘of the motor 3%. From the outlet
a pair of pins 42 and 43 diametrically opposed
of the pump 56 leads a short pipe section 68 com
with respect to the fulcrum 4| for the lever 45},
municating with a pressure regulating device 69.
and a cooperating lever 44 is provided with ears
The pressure regulating device 59 is preferably
45 and 61-5 respectively supported upon said pins
constructed to maintain a constant ?uid pres
42 and 43. The lever 44 may preferably take the
sure of, say, one hundred pounds per square inch
form of a yoke straddling the lever fill, and pro
vided on both sides of said lever M] with cars 45 20 in the supply conduit ‘ill, in which is connected
a flexible section ll. The conduit iii leads
and 46 cooperating with opposite projections of
through a four-way valve 12 to conduits con
the pins 42 and 43. A spring M, hooked over
nected with the opposite ends of a ?uid motor,
pins 48 and 49 upon the levers MI and all, respec
indicated generally by the reference numeral '54.
tively, normally holds both ears of the lever til
The motor ‘it comprises a cylinder iii, pivotally
in‘contact with the pins 152 and 43; but if a force '
supported at Hil upon a bracket iii which may
'ten'dsito move ‘the lever 44 beyond either limiting
be supported'upon the base which mounts the
position of the lever All, the lever is will simply
motor '38. Reciprocably mounted within the cyl
pivot about one 'or the other of the pins K52 and
inder ‘i5 is a piston l6 having a stem ll project
t5, thus stretching the spring 41. Upon relaxa
ing from the end of the cylinder ‘[5 remote from
‘ tion of the force applied to the lever 44, the spring .
the pivotal mounting MB. A conduit 13 com~
- M will return said lever 44 to its illustrated po
'municates with‘ the lower end of the cylinder ‘i5
sition with respect to the lever 40;
and a conduit 18 communicates with the upper
’ A bar 50, comprising an extension of the lever
end thereof.
154, is formed to provide a portion bent down
The four-way valve '52 is illustrated in detail in
wardly in the ‘manner illustrated for a purpose 35
Fig.2.. Its function is to connect the opposite
>_la-ter‘~ to become apparent.
ends of the cylinder l5 alternatively with the
:Suitably 'journalled in parallelism with the
supply line ‘it. Said valve comprises a casing 79
jm’otor spindle 32 is a driven shaft 55 carrying a
within which is mounted‘a valve body 88 formed
variableeffective-diameter ‘pulley indicated gen
erally by the reference numeral 52 and compris 40 with two straight-through passages 89 and 32,
and with crossed passages 83 and 815. In the
ing a coned disc-‘53 ?xed to the shaft 5! vand a
illustrated position, it will be seen that the pas
mating coned disc “54 axially shiftable with re
sage 83 connects the conduit 13, communicating
spect thereto. A coiled spring 55 sleeved on the
with
the lower end of the cylinder '55, with the
shaft 5| bears at one end against‘the disc 5!}
conduit 85, while the passage ?ll connects the
andlat its opposite end against a ?xed abutment
supply line ‘ill with the conduit ‘l8 communicating
56,, tending constantly to urge the disc 54 toward
with the upper end of the cylinder. The valve
thevdisc‘ 53. An edge-active belt 57 provides a
body 82'!- is ‘provided with a stem
projecting
j driving connection between the ‘pulleys '33 and
from the housing iii; and an actuating lever Bl,
52. 'It will be clear that, as the disc 35 is moved
suitably pivotally mounted, as at 853, has a lost
toward the disc 34, the belt 51 will be squeezed
motion connection 89 with said stem E35. Clock
“ outwardly between the two discs, thereby increas
wise movement of the lever Bl will shift the valve
ing the effective driving diameter of the pulley
v‘body 8% to its opposite position, in which the
'33. correspondingly, the belt 51 Will be drawn
passage 8'! will establish communication between
' inwardly between the discs 53 and 54. thus forcing
the disc 54. to move, against the tendency of the
spring 55, away from the disc 53, thus decreasing
‘the effective diameter of the pulley 52, to in
' the supply line it and the conduit l3 leading to
the lower end of the cylinder l5,‘while the passage
82 will connect the conduit 18 leading from the
upper end of the cylinder ‘Li with the conduit 8'5.
"crease the output ‘speed of the shaft 55. Simi
When the test stand is being used to test a
larly. when the disc '35 is moved away from the
disc 34, the tension upon the belt 5'! is relaxed,‘ 60 governor-of the character illustrated'herein, the
valve 12 will always be maintained either in the
whereby the spring 55 is permitted to force the
position illustrated in'Fig. 2, or, under special
disc 53 toward the disc 53. Thus the effective
circumstances, in its intermediate position in
diameter of the pulley 33 is reduced, the effective
which ‘the supply line ‘IE3 and the conduit 85 are
diameter of the pulley 52 is increased, and the
entirely disconnected from the ?uid motor ‘E4.
output speed of the shaft 5! is decreased.
The opposite position of the valve 12 is for use
An adapter bracket 58 supports a pillow ‘block
.in connection with a different type of governor
59 which is formed to provide a journal mounting
Y for a block 69, ?xed to the driven shaft 55, and
mechanism,
_
’
'
The conduit '85 is provided with a ?exible sec
driving seat for a bevel gear 52 at the end of the 70 tion 98, and leads to a passage 9! in the pillow
bloc-k 58 which, when the governor mechanism
' e‘gerating shaft'iiiii for the governor mechanism
‘ illustrated herein is'in position vfor test, registers
_ As ‘is well understood in the art. the shaft
with the passage 28 ‘thereof.
63 is connected to drive the governor pump 2%
A conduit 92 ‘leads from the pressure regulat
and the governor rotor III. The details of this
> drive are immaterial to the present invention, 75 ing mechanism 69 to a T-fitting >93 communicat
I provided with a socket 5! formed to provide a
2,410,155
6
'ing, through a pipe 94, with the reservoir 64. . The
regulating mechanism 69 is so. ‘constructed that,
when the ?uid pressure'therein materiallyex
ceeds the above-mentioned predetermined value
_of,'say, one hundred pounds per square inch, ?ow
is permitted through said regulating device and
the conduit 92 to the reservoir 64.
a
A further conduit 95 leads ‘from the T-?tting
‘93 to a passage 95 in the pillow block 59 which,
when the governor mechanism illustrated herein '
' With the parts in these positions, the lower end
of the cylinder 15 is vented through the conduit
13, passage 83, conduit 85,'passage 9|, passage
'28, port 21, bore 29, bore 26, sump 98, passage
99, and conduit I 00 to the reservoir 64. Fluid
under the pressure of the pump 65 is therefore
supplied, through the conduit 68, regulator mech
anism 69, ‘conduit 10, passage 84, and conduit
‘I8, to. the upper end of the cylinder ‘I5 to move
the piston ‘I5 downward, thus swinging the lever
is in position for test, registers with the passage
44 and the lever 40 in a counter clockwise direc
25 of said governor mechanism. The pillow block
tion to shift the disc 35 toward the disc 34 to in
is further formed with a bore 98 into which opens
crease the speed of the shaft 5| and of the gov
the bore 26 of the governor mechanism, and from
ernor mechanism. As speed of the governor
which leads a passage 99 with which is connected 15 mechanism is increased, it ultimately reaches a
a conduit I00 leading to the reservoir94.
value at which the ?y weights I2 will assume the
' ' The conduit 73 has a branch -|0I and the con
duit '78 has a branch I02, which branches lead
positions iluustrated in Fig. 3, ‘at which instant
communication between the passage 28 and the
through a four-way valve I03'similar to the valve
bore 29 is cut off so that further flow of ?uid from
12. From said valve I03 are extended av conduit 20 the lower end of the cylinder ‘I5 is prevented.
I05 leading to the delivery side of the pump 66,
This is the condition of equilibrium which will'be
and a conduit I06 leading to the reservoir 64'.
maintained by the mechanism unless some fur
vIn the illustrated position of the actuating lever
ther extraneous adjustment is made.
I04, the branches IN and I02 are blocked, In
The speed of the shaft 5| may be further in
one extreme position of said lever, however, the 25 creased either by manipulation of the lever‘ I04
conduit I05 will be connected with the branch
or by manipulation of the hand wheel I9. If the
I02, while the branch IOI will be connected with
adjustment is made by manipulation of the lever
the conduit ‘I06 whereby ?uid under pressure will
I04, such increase in the speed of the shaft 5|
‘be supplied to the upper end of the cylinder 15
will cause the ?y weights to move toward the
andthe lower end of said cylinder will be con- '
position illustrated in Fig. 4, thus further lifting
nected to the reservoir 64. Thus, the piston 16
the valve I4 to establish communication between
will be moved downwardly in the cylinder ‘I5 to
the outlet 2| of the pump 20 and the passage 28.
shift the disc 35 toward vthe disc 34, thus increas
The ?uid pressure produced by the pump 20
ing the speed of the shaft‘5 I. In the opposite ex
is considerably higher than that produced by the
treme position of the lever I04, the branch I 0|
pump 66. Consequently, when’the valve I4 as
will be- connected to the conduit I95 while the
sumes the position of Fig. 4, ?uid will ?ow from
vbranch I02'is connected to the conduit I06,
the pump 20 throughthe passages 2| and 22,;
whereby ?uid under pressure will be supplied to
around the reduced section 30 of the valve I 4, and
the lower end of the cylinder 15, the upper end
through passage 28, passage 9|, conduit 85, pas
of said cylinder will be vented, 'and‘the disc 35 40 sage 83, and conduit 13 to the lower end of the
will be moved away from the disc 34 to reduce
cylinder ‘I5. There,‘ acting upon the piston ‘I6 at
a pressure higher than the pressure supplied by
the speed of the shaft 5|. Of ‘course, during any
such preliminary adjustment of the mechanism
the pump 66. the ?uid will cause upward move
the lever 8‘! will be in its intermediate position,
ment of the piston 16, crowding ?uid out of the
axis '4I of said lever, - Thereby, the volume \of
upper end of the cylinder 15 through the conduit
‘I8, passage 84, and conduit 10 to the regulator
mechanism 69. Such ?ow of ?uid to the regu
lator mechanism 09 will increase the pressure
within said mechanism beyond that for which the
valve at the right end thereof is set, and that
valve will open to permit ?ow of ?uid through
the conduit 92, the ?tting 93, and conduit 94 to
the reservoir 54. Of course, the ?uid driven. by
the pump 29 will be drawn thereto either from
the reservoir (54 or from the conduit 92through
?uid required to be delivered to the ?uid motor
the T-?tting93, conduit 95, and passages 96-, 25,
14 in order to effect a given degree of adjustment
and 91.
of the disc 35 may be varied to ?t desired oper
Such upward movement of the piston ‘IE will
shift the disc 35 away from the disc 34 to reduce
the speed of the shaft 5|, thus returning that
speed to the value at which the fly weights I2
will assume the position illustrated in Fig. 3 in
which the valve I4 cuts o? communication be
tween the pump outlet 2| and the passage 28.
locking the ?uid motor ‘14 against any in?uence ~
under the control ‘of the governor mechanism I0.
The piston 16 is'connected to shift the disc 35,
by means of a link vI01 pivotally connected at I08
to the piston stem ‘I1 and adapted to embrace the
lever 50, being secured thereto by set screws I09. :
Because of the pivotal mounting of the'cylinder
-'I5 at II9, it ‘will be clear that the yoke I01 may
be secured to the lever ‘50 at any one of a plu
rality of points differently spaced from the pivotal
ating conditions.
When a governor mechanism to be tested has A so
been suitably associated with the'pillow block-59,
the lever 87 being in its intermediate position,
the motor 3| is energized, and the position of-the
piston ‘I6 and lever 40 will be adjusted, by ma
nipulation of the lever I04, to bring the governor 65
parts into the position of Fig. 3. The positions of "
If, ‘instead of manipulating the valve 404, the
operator shifts the hand wheel I 9 to increase the
compression of the spring I5, the ?y weights I2,
the parts under these conditions of equilibrium
[at a given speed of the rotor II, will be swung
are now noted, and then the lever I04 is further
inwardly by that increase in spring pressure, thus
manipulated to reduce the speed of the shaft 5|
to a value approximately 600 R. P. M lower than
returning the valve I4 to the position illustrated
the ‘equilibrium value. Now the lever I04 is set
in Fig. 1. Under these circumstances, the cycle
in its intermediate position and the lever '81 is
?rst above described will be followed to increase
set in the position illustrated in Fig. 1. Because
the speed of the shaft 5| to, a new value of
:of the lower speed, the governor parts will now
assume the positionsillustrated in Fig, 1.
75. One of the'points to be determined in testing
equilibrium.
'
,
i
2,410,155
8
7
governor mechanisms of the type ghere‘under con
sideration is the'time required for the governor
to pass a sufficient volume of ?uid to bring the
governor speed from a value 600 R. P. M. below
optimum to the optimum, or equilibrium value.
It is sometimes ‘found that the adjustment is
made'so quickly as not to be feasibly measurable.
cylinder and a piston reciprocable therein, ‘a ?uid
reservoir, conduit means connecting said reservoir
withsaid inlet, conduit means connecting said
outlet with one end of said cylinder, pressure
regulating means ‘in said last-named conduit
means for maintaining substantially constant the
struction or connections of the governor mecha
nism. If the link Hl'l is shifted to a position
farther from the axis of oscillation of the lever
named conduit means, and means for driving
said speed-responsive means comprising a shaft,
pressure in such conduit means, conduit means
communicating with the opposite end of said
In such a case, the ?exible construction of the
cylinder, speed-responsive means for controlling
‘present test stand makes it possible to increase
that ‘time interval without modifying the con 10 the rate and direction of flow through said last
a driver connected to drive said shaft, and an
element shiftable oppositely to vary oppositely'the
49, ,a greater degree of movement of the piston
16 will be required to effect a given degree of 15 speed of rotation of said shaft, said piston being
operatively connected to shift said element.
movement of the disc 35. Thus, by so shifting
4. In a device of the class described, a ?uid
the position of the link fill, the volume of ?uid
reservoir, a ?uid pump having an inlet and an
required to be passed by the governor mechanism
outlet, a first conduit connecting said reservoir
to produce ‘a speed increase of 7600 R. P. M., and
therefore the time interval required to produce 20 with said pump inlet, a fluid motor comprising va
cylinder 1 and a piston reciprocable therein, a
that speed increase, can ‘be materially enlarged.
second conduit connecting said pump outlet with
I claim as my invention:
1. For use with a governor including a ?uid
pump, a rotor, means connected to drive said
pump and said rotor, speed-responsive means op
one end of said cylinder, a third conduit com
municating with the other end of said cylinder,
25 afourth conduit communicating with said reser
eratively associated with said rotor and connected
to shift avalve oppositely, in response to opposite
variations in the speed of said rotor, between a
high-speed position and a low-speed position
through an intermediate position; testing appa 30
voir, a driving shaft, a driven shaft, means con
necting said driving shaft to drive said driven
shaft ‘including an element shiftable oppositely
to ‘vary oppositely the speed ratio between said
shafts, means‘ connecting said piston to. shift
said shiftable velement, and means operable by
ratus comprising a source of fluid under con
said driven shaft for controlling the rate and
stant pressure, a ?uid motor including a cylinder
direction of ?uid ?ow through said conduits, in
and a piston reciprocable therein, conduit means
response to variations in the speed of said driven
connecting said ?uid source ‘with said cylinder on
one side of said ‘piston, conduit means connecting 35 shaft.
said cylinder on'the other side of said piston with
5. The combination with a driving shaft, a
said valve, passages controlled by said valve for
driven shaft, and means connecting said driving
' alternatively vplacing said last-named conduit
shaft to drive said driven shaft at variable speeds
including an element shiftable oppositely to vary
means in communication with said pump or with
exhaust, a shaft connected to drive said pump
oppositely the ‘speed ratio between said shafts,
and said rotor, and ‘means for driving said shaft
of a ?uid motor including a cylinder and a piston
at variable speeds, said last-named means includ
reciprocable therein, said piston being operatively
ing an element sh-i-ftable oppositely to vary oppo
connected to shift said element, means for con
sitely the speed of said shaft, and said ?uid motor
being connected to shift said‘shiftab'le element,
stantly impressing a predetermined ?uid pressure
2. For use with a governor including a ?uid
pump, a rotor, means connected to drive said
upon one side of said piston, a source of ?uid
under higher pressure, and‘ valve means effective
at times to establish communication between the
pump and said rotor, speed-responsive means op
eratively associated with said rotor and connected
to shift a valve oppositely, in response to opposite
variations in the speed of said rotor, between a
opposite side of said piston and said source, at
other ‘times to establish communication between
said opposite, side of said piston and exhaust,
and at other times to close communication with
high-speed position and a low-speed position
said opposite side of said piston, said valve means
through an intermediate position; testing appa
being responsive to the speed of said driven shaft.
ratus comprising a source of ?uid under constant
'6. A test stand for governor mechanism of the
pressure, a ?uid motor including a cylinder and. 55 type including a ?uid pump and a variably
a piston reciprocable therein, conduit means con
dr'iven element operable in response to speed
necting said ?uid source with said cylinder on one
side of said piston, conduit means connecting said
cylinder on the other side of said piston with said
valve, passages controlled by said valve for plac
ing said last-named conduit means in communi
cation with said pump when said valve is in its
high-speed position and for placing said last
named conduit means in communication with ex
haust when said valve is in its low-speed ‘position,
said valve closing said last-named conduit means
when in intermediate position, a shaft connected
to drive said pump and said rotor, and means for}
driving said shaft at variable speeds, said last
named means including an element shifta'ble vop
positely to vary oppositely the speed of said shaft,
and said fluid motor being connected to shift said
shiftable element.
‘
3. In a test stand, a ?uid pump having an
inlet and an outlet, a ?uid motor comprising a
variations to shift a valve from a position es
tablishing ‘communication between a ?rst port
and an exhaust through a position closing both
60 of said ports, to a position establishing communi
cation between the delivery port of said pump
and said ?rst port, said stand comprising a driven
shaft connectible to drive said variably-driven
element, a driving shaft, means connecting said
driving shaft to drive said driven shaft includ
ing an element shiftable oppositely to vary op
positely the speed of said driven shaft, a stand
?uid pump, a ?uid motor comprising a cylinder
and a piston reciprocable therein, a conduit pro
viding communication between the outlet of said
stand ?uid pump and one end of said cylinder, a
conduit connected to the other end of said cyl
inder and connectible with said ?rst port of said
governor ‘mechanism, and means connecting said
piston toshift said shiftable element.
2,410,155
" 9
a
said standcomprising a driven shaft connectible
A test: stand for governor mechanism of the
‘type including'iai ?uid'ipump' and a variably
~to;drive said variably-driven element, a driving
driven elementloperable" invresponse 'to speed
shaft, means ‘connecting said driving shaft to
variations to shift a ‘valve, from a position es
drive-said driven shaft including an element
. shiftable oppositely to vary oppositely the speed
of said driven shaft, a source of ?uidunder pres
sure, a?uid motor comprising acylinder and a
tablishing‘ communication , between a ' ?rst L port
"and an exhaust through a'position closing both
of said ports,’ to‘a position establishing com
munication» between the delivery port of said
pump and said ?rst port, said'stand comprising
‘a driven shaft connectible to drive said variably
, piston 'reciprocable therein, a ?rst conduitv means
connected to oneend of said cylinder, a second
.conduit means connected to the opposite end of
driven element, a driving shaft, . means lconn'ect
.said cylinder, a third conduit means leading from
--in‘-'g's'ai'd'-driving shaft to. drive said driven shaft
i .said source, a fourth conduit means connectible
to said ?rst port of 'said'governor mechanism,
"including an element shiftable oppositely to vary
‘oppositely the speed of said drivenshafua ?uid
reservoir, a stand ?uid" pump having-an inlet
and an outlet;ia»l?uid"motor comprisinga cyl
inder ar1d__a_ piston reciprocable therein, a ?rst
‘valve means associated with saidconduit means
and shiftable between aposition connectingsaid
?rst conduitmeans with said third conduit means
and. said, second conduit, means, with said, fourth
, conduit means, and a position connecting said
conduit‘means-‘connecting said stand ?uid pump
inlet with said reservoir, a second conduit means
connecting said stand ?uid pump outlet with
one end of said cylinder, at third conduit means
connecting said second conduit means and said
stand fluid pump outlet with said reservoir,
pressure-responsive flow-controlling means oper
able to prevent ?uid ?ow through said third con
duit means toward said reservoir at pressures
below a predetermined value, a fourth conduit
means communicating with the opposite end of
said cylinder and connectible with the ?rst port
of such'governor mechanism, a ?fth conduit
means communicating with said reservoir and
connectible with the intake of said governor ?uid
pump, a sixth conduit means connectible with
said governor mechanism exhaust and leading
to said reservoir and means connecting said
piston to shift said shiftable element.
8. A test stand for governor mechanism of the
type including a fluid pump and a variably
driven element operable in response to speed
variations to shift a valve from a position estab
lishing communication between a first port and
an exhaust through a position closing both of
said ports, to a position establishing communica
tion between the delivery port of said pump and
said ?rst port, said stand comprising a driven
shaft connectible to drive said variably-driven
element, a driving shaft, means connecting said
driving shaft to drive said driven shaft includ
ing an element shiftable oppositely to vary op
positely the speed of said driven shaft, a source
of ?uid under pressure, a ?uid motor comprising
a cylinder and a piston reciprocable therein, a
?rst conduit means connected to one end of said
‘cylinder, a second conduit means connected to
?rst conduit means with said fourth conduit
20 means and said second conduit means with said
third conduit means, a pressure-responsive ex
haust valve in said third conduit means, said
valve means being operable to vent said third
conduit means only when the pressure therein
exceeds the pressure of said source by a predeter
mined amount, and means connecting said piston
to shift said governor mechanism.
10. A test stand for governor mechanism of the
type including a ?uid pump and a variably
30
driven element operable in response to speed
variations to shift a valve from a position estab
lishing communication between a ?rst port and
an exhaust through a position closing both of
said ports, to a position establishing communica
35 tion between the delivery port of said pump and
said ?rst port, said stand comprising a driven
shaft connectible to drive said variably-driven
element, a driving shaft, means connecting said
driving shaft to drive said driven shaft includ
40 ing an element shiftable oppositely to vary oppo
sitely the speed of said driven shaft, a source of
?uid under pressure, a ?uid motor comprising a
cylinder and'a piston reciprocable therein, a first
conduit means connected to one end of said cylin
der, a second conduit means connected to the
opposite end of said cylinder, a third conduit
means leading from said source, a fourth conduit
means connectible to said ?rst port of said gov
ernor mechanism, valve means associated with
50 said conduit means and shiftable between a po
sition connecting said ?rst conduit means with
said third conduit means and said‘ second con
duit means with said fourth conduit means, and
a position connecting said ?rst conduit means
the opposite end of said cylinder, a third conduit 55 with said fourth conduit means and said second
conduit means with said third conduit means,
':.means leading from said source, a fourth con
means independent of said conduit means for
[duit means connectible to said ?rst port of said
supplying ?uid under pressure to either end of
rgovernor mechanism, valve means associated
said
cylinder while venting the other end of said
with said conduit means and shiftable between
:a position connecting said ?rst conduit means 60 cylinder, and means for connecting said piston to
shift said governor mechanism.
‘with said third conduit means and said second
11. The combination of claim 3 in which the
conduit means with said fourth conduit means,
operative connection between said piston and
and a position connecting said ?rst conduit means
said shiftable element comprises a pivoted lever
with said fourth conduit means and said second
conduit means with said third conduit means, 65 operatively connected to said shiftable element,
and a yoke pivotally connected to said piston and
and means connecting said piston to shift said
adjustably attachable to said lever at any one
governor mechanism.
of a plurality of points on said lever differently
9. A test stand for governor mechanism of the
type including a ?uid pump and a variably-driven
spaced from the pivotal axis of said lever, said
element operable in response to speed variations 70 cylinder being pivotally mounted to swing about
an axis parallel with the pivotal axis of said lever.
to shift a valve from a position establishing com
12. The combination of claim 3 in which said
munication between a ?rst port and an exhaust
cylinder is mounted to swing about an axis per
through a position closing both of said ports, to
pendicular to the line of movement of said piston
a position establishing communication between
the delivery port of said pump and said ?rst port, 75 and in which the operative connection between
2,410,155
said piston and said shiftable' element comprises
12
with said lever at any one'of a plurality of points
on said angularly related portion di?erently
a- lever mounted for oscillation about an axis par
spaced from the axis of oscillation of said lever.
allel with said ?rst-mentioned axis and opera
14; The combination of claim 3 in which said
tively connected with said- shiftable element, and
cylinder is mounted to swing about an- axis per
means connecting said piston with said lever at
pendicular to the line of movement of said piston
any one of a plurality of points differently spaced
and in which the operative connection between
from the axis of oscillation-of said lever.
said piston and said shiftable element comprises
13. The combination of claim 3 in which said
a lever mounted for oscillation about an axis par
cylinder is mounted to swing about an axis per
pendicular to the line‘ of movement of said piston 10 allel with said ?rst-mentioned axis and opera
tively connected with said shiftable element, a
and in which the operative connection between
second lever operatively but resiliently connected
said piston and said shiftable element comprises
to said ?rst-mentioned lever, and means connect
a lever mounted for oscillation about an axis
ing said piston with said second lever at any one
parallel with said ?rst-mentioned axis and op
of a plurality of points di?erently spaced from
eratively connected with said shiitable element,
the axis of oscillation of said levers.
said lever having a portion angularly related to
its main body and inclined toward said ?rst-men
tioned axis, and means connecting said ‘piston
IRVIN V, FALK.
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