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Патент USA US2075521

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March 30, 1937.
F. w. HILD
2,075,521
MULTIFLOW COOLING SYSTEM FOR INTERNAL COMBUSTION ENGINES
Filed Nov. 10, 1930
33
36
35 3b 37
2,075,521
Patented Mar. 30, 1937
UNITED STATES ‘PATENT 1 OFFICE‘
MULTIFLOW COOLING SYSTEM FOR INTER‘
NAL COIVIBUSTION ENGINES
Frederic W. Hild, Los Angeles, Calif.
Application November 10, 1930, Serial No. 494,567 ' ‘
35 Claims.
My invention relates to cooling systems for in
ternal combustion engines and appertains more
particularly to those for automotive vehicles.
(01. 123-178)
22 for conducting water is connected with one
end of a heat exchange device 24, such as a coil
It is an object of my invention to provide a
5 multi?ow cooling system which shall more eili
of tubing disposed in the oil reservoir in the bot
tom of crank case 23 of engine 8. The coil 24
surrounds the customary oil pump 25; both the
ciently utilize the water cooling radiator and
which shall comprehensively regulate the engine
temperatures for all loads.
In my co-pending application, Serial Number
10 490,480 ?led October 22, 1930 I have disclosed
ing oil in the reservoir, the oil pump forcing the
oil to the various parts of the engine in the usual
coil and the pump are submerged in the lubricat~
manner. The other end of coil 24 connects with
the riser tube 26 which connects with ?ow in
' a novel cooling system for internal combustion
ducer 20, the ?ow inducer-as pointed out con
meeting with upper tank 9.
The ?ow inducer 20 has water passage 21 which
providing it with simple and effective means for ‘ connects with manifold l9, and it also has water
l5 rapidly warming a cold engine.
passage 28 which connects with riser tube 26. 15
Other objects and advantages of my invention The passage 21 extends into and is surrounded
will be apparent from the following description by passage 28 and both passages lead into com
and the accompanying drawing:
mon ori?ce 29. Passage 21 may be aptly termed
Figure 1 is a vertical elevation in part section a nozzle. ’
,
20 showing the apparatus embodying my invention.
A valve 30 disposed in the ori?ce 29 controls 20
Figure 2 is a horizontal section taken on the the ?ow of water from vthe inducer 20 to upper
line 2--2 of Figure 1.
tank 9. The valve 30 which swings upward to
Figure 3 is a sectional view taken on line 3—3 e?ect closure has valve stem 3| which is jour
of Figure 1 and illustrates the manually operated naled in the walls of ori?ce 29 and projects
through one wall of the ori?ce into-the adjacent 25
Is’. 91 valve of the ejector ?ow inducer.
Figure 4 is a sectional view of the valve con
compartment 32 of the flow inducer 20. The pro
trolled ejector ?ow inducer taken on line 4,—4 of jecting end of the valve stem is bent upward to
Figure 3 and also shows the upper tank of the form a lever with a suitable opening at the end
engines. ‘It is an object of my present invention
to further improve my said cooling system by
radiator.
'
_
Figure 5 is a vertical sectional view of a modi
fled automatic valve of the ejector ?ow inducer.
Referring to ‘the drawing, the radiator 6 is
air cooled by ‘fan ‘I which is driven by the engine
8'in the usual manner. The radiator has an up
35 per 'tank 9 and a lower tank In which are con
nected together by cooling core II. The core con
sists of the tubes l2 and the ?ns l3, the tubes
providing numerous water channels leading from
the upper tank to the lower tank. Air drawn
40 through the core ll cools the water in the tubes.
The lower tank has two openings or outlets l4
and I5 respectively. A pump [6 connects with
the lower tank at outlet 14 and is in turn con
nected by a pipe I‘! to water channels l8 which
jacket the' engine cylinders in the customary
manner.
The said water channels communicate
with manifold l9 which connects with the ejector
?ow inducer 20 which in turn connects with up
per tank 9 in theopening 2|. By means of the
pump. water under pressure may be circulated
from the lower tank l0 through the water chan
nels l8, manifold 19, ejector flow inducer 20, and
opening 2| into upper tank 9 and descending
through cooling core H to the lower tank ID.
55
A
of the lever for receiving a pair of links 33. A
spring 34 is secured to an end wall of compart
ment 32 and to one end of each of links 33; the,
spring being always in tension operates to pull
the valve 30 into open position. The other end
of each of links 33 is pivotally secured to the
closed end of a bellows 35 which also is contained 35
within the compartment 32. The other open end
of the bellows 35 is secured ?uid tight into the
compartment by guide nut 36 and jam nut‘ 31
both of which are threaded into the other end
of compartment 32. A cover plate 38 is secured 40
to the open side of compartment 32, this cover
plate and the bellows 35 preventing leakage of
water which might seep through the journal
bearing for the valve stem.
A spring link 39 is secured to the valve operating ' 45
mechanism. The spring link comprises two ter
minal members with a spring disposed between
them, such that pull or tension on the terminal
members will compress the spring and will length
en the spring link assembly, until the spring is 50
compressed to its limit.
One terminal of spring link 39 is slidably sup
ported by guide nut 36 ‘and is ?rmly secured to
the closed end of bellows 35. The other terminal
From the opening I5 of lower tank [0, a tube , of. spring link 39 is secured to‘ an end of intermedi
55
2
2,076, 62 1
ate lever 40 and also to an end of choke rod 4|.
The choke rod extends to and terminates in a
choke handle (not shown).
The intermediate lever 40 is fulcrumed on car
5 buretor 42 the other end of the lever having a slot
43 in which the end of choke lever 44 is slid
ably secured. The choke lever 44 is part of the
gas admission mechanism of the engine, its func
tion being to control the admission of raw un
10 vaporized gasoline from the carburetor to the
engine. A spring 45 always in tension, operates
i
to pull and hold choke lever in opened position.
It is well understood that in order to start a
cold engine it is usually necessary to operate the
15 choke lever to cut off the air supply to the car
buretor and thereby admit unvaporized gasoline
to the cylinders until the engine and carburetor
are warmed su?iciently to operate with gas va
por. It is important that the engine be warmed
20 quickly, and this is accomplished by the herein
described apparatus in the following manner:
A pulling force upon the choke rod 4| is trans
mitted by spring link 39 to the flow inducer valve
mechanism consisting of bellows 35, link 33, valve
25 stem 3| and valve 30 which are thereby moved
against the resistance of spring 34 into the posi
tion of valve closure where further movement of
the valve mechanism is stopped. Meanwhile the
intermediate lever 40 pivoting on its fulcrum will
30 have been moved to the limiting position of slot
43 so that choke lever 44 is against the end of the
slot. In response to continued pulling movement
of the choke rod 4| and the permissive lengthen?
ing of spring link 39, the intermediate lever 40
will move choke lever 44 into position for feeding
unvaporized gasoline to the engine cylinders. By
this time the engine and the water pump it are
being motivated by the starting motor or other
suitable starting means and the engine begins to
40 run on the gasoline fuel whereupon the water cyl
Jackets i8 and manifold it by the pressure of
the pump l9, now flows through ori?ce 29 of the
flow inducer into upper tank 9, then down through
cooling core ii to lower tank III and again into
pump IS, the circulation being continuous. At the
same time the ejector flow inducer 20 due to the
action 01' water passing through it under pressure
and the considerable velocity imparted by the
pump l6, induces the water in riser tube 28, coil
24 and tube 22 to flow into and through ori?ce 29.
into upper tank 9 and down through cooling core
Ii into lower tank i0 and again into tube 22 and
repeating the cycle thereby establishing complete,
continuous induced circulation of the cooling
liquid. Passage 29 has a constricted throat form?
ing a venturi adjacent the discharge opening of
nozzle 21. The velocity of the liquid passing
through the throat is thereby increased and mate
rially increases the ejector action. The water
thus circulated through coil 24 is now cooling 20
water, as it is drawn from the bottom of tank It
after passing through the radiator pipes l2.
Having described herein a simple ‘manually
controlled means for circulating the heated
water from the cylinder water Jackets back
again through the engine in close thermal as
sociation with the lubricating oil in the engine
and conserving the heat by not subjecting the
circulating water to forced cooling in the radia
tor, thereby rapidly and effectively warming the
engine,—I provide also a simple, automatic
means for accomplishing the same operation,
the same result and which possesses other im
portant advantages and benefits as will be ap
parent.
Referring to Figure 5, this shows the flow
inducer valve 30 operated by a thermostat im
mersed in the liquid entering the flow inducer
20. In this embodiment of my invention, the
manually operated means are dispensed with,
inder jacket i8 becomes heated.
The valve 30 having closed the ori?ce 29 of the both the spring‘ link 39 and the intermediate
flow inducer 20, the water which is being forced ' lever 40 being omitted and the choke rod 4| be
ing connected directly to the choke lever 44 in
through the water jackets l9 and manifold i9 . the
usual manner.
45 by the pump l6, cannot flow into upper tank 9 of
An
opening 46 is provided in the wall separat
the radiator, but is diverted in the flow inducer ing the water passage 28 and compartment 32
and forced through riser tube 25, coil 24 and tube so that liquid may freely enter the compartment.
22 into the lower tank Hi to be again drawn into
pump l6 and circulated as just explained. The The riser tube 26 leads into the ?ow inducer at
50 water entering the coil, which functions as a heat
exchanger, is about as hot as the water in the
manifold l9; and therefore the coil 24 becomes
heated and transmits heat to the lubricating oil
which in turn warms the engine parts reached by
55 it.
The circulating water as it leaves tube 22 and
enters the lower tank ID will have lost some of its
heat to the oil. Some heat transfer occurs from
the warm water in lower tank It to the cold water
60 in cooling core ||, mostly by convection, but the
loss of heat is relatively small in view of the fact
that the heated circulating water does not pass
through the cooling core and is therefore not sub
jected to forced cooling by radiation.
65
Manifestly the engine warms very rapidly the
fuel vaporizes more freely and smooth- engine run
ning quickly occurs. Thereupon the pull on the
choke rod 4| and sprink link 39 which is manually
exerted should cease, and due to the action of
70 springs 34, 45 and spring link 39,——the valve 30
in the flow inducer is opened and the choke lever
44 operates to cut off the raw gasoline which is
replaced by vaporized gas from the carburetor.
With the valve 30 of flow inducer 20 in open
75 position the water circulating through the water
35
~10
this opening so that a thermostat 41 in the
compartment 32 is always immersed in the liquid
passing through riser tube 26. The thermostat
41 is secured fluid tight into compartment 32
by the end cap 48. A guide post 49 projecting
upward from the bottom of the compartment
slidably supports the push rod 50 which extends
into the re-entrant part of the bellows 41. A
push cap 5| threaded on the end of push rod
50 bears against the thermostat. A compression
spring 52 surrounds the push rod 50 and is inter
posed between the guide post 49 and the cap 5|.
The spring 52 exerts resilient force to contract
the thermostat, that is, the spring opposes the
expansive power of the thermostat when the
latter becomes heated. The other end of the
push rod 50 is pivotally secured to an inter ii .3
mediate point of a pair of lever links 53 which
are fulcrumed at the lower end on a suitable
fulcrum 54 projecting forward from the bottom
of compartment 32. A connecting link 55 is
pivotally fastened near the other end of lever
links 53 connecting the latter with the lever end
of valve stem 3|. To the free. end of lever links
53 is secured one end of an adjusting spring 56,
the other end of this spring having swivel con
nection with adjusting screw 51. This adjusting
2,070,521
screw is threaded into a neck 58 which forms
the top of compartment 32, the screw- being
locked into position by jam nut 59, a packing 60
between the jam nut and the adjusting screw
5 51 prevents leakage from the neck.
It is apparent that adjusting spring 55 which
is always in tension and compression spring 52
both act to pull the valve 30 so that it will swing
downward into closed position. Opposing the
10 combined force of the two springs is the power
3
culating through the cylinder jackets II and "
manifold l9. The velocity and pressure of the
water from the pump vary with the engine speed.
So that, the thermostat responding to the -\
greater heat of the larger engine load, effects
ample opening of valve 30; the su?icient ejector
action in the flow inducer causing the water to
flow from the lower tank through the coil 24
through the flow inducer and into the upper tank,
then down the cooling core where it is cooled 10
of the thermostat H which expanding as it be
comes‘ heated by the water in which it is irn—
before it enters the lower tank. _ Thus the two
mersed, operates to open the valve 30.
The internal combustion engine being a heat
15 engine, its theoretical efliciency is best at high
temperature; but certain essential factors of en
channels in the engine are no longer in series but
gine operation determine the practical tempera
.ture limit. If the combustion chamber is exces
sively hot, pre-lgnition may occur. - The greater
20 expansion of the fuel mixture entering an over;
streams circulating through the two cooling
are now in parallel relation; water flow in one of
the channels has been reversed in direction; and 15
all of the circulating water of both streams ‘is
new subject to forced cooling by the radiator
cooling core. Because of the higher pump speed,
more water now circulates through the pump and
the cylinder jackets than before, but this consti 20
heated cylinder before compression, results in tutes only a portion of the water ‘now circulating
decrease of power. If the cylinder walls become . through the engine, the stream through the oil
very hot, the lubricating oil becomes too thin cooler being separate from and additional to that
and may fail with consequent friction difliculties ‘through the pump and the cylinder jackets. Also
25 resulting in excessive wear of the engine parts
and even seizing. It is generally recognized that
lubrication determines the practical upper
temperature limit and when this is not _ ex
ceeded, all the essential engine factors will have
30 safe margin as affected by temperature.
In the cooling system herein described, it will
be observed that when valve 30 is closed, the
thermostat 4‘! is in the path of the water flowing
from the cylinder water jackets. The two water
35 channels in the engine (water jackets l8 and
manifold i9 being one, and the coil 25 being the
other) are in series with each other, the water
?owing in a single circulating stream through
this series path toward and through the lower
40 tank it and into pump it. The circulating
stream does not pass through upper tank 9 nor
cooling core ii and therefore is not subject to
forced cooling.
When the water from the cylinder water
jackets becomes su?iciently heated, the thermo
stat fl? expands, overcoming the resistance of
springs 52 and 5‘! and gradually opens valve 30
in the ?ow inducer. When the valve opens part
way the single stream is divided and becomes
-0 two streams at the ?ow inducer, one continuing
to flow through the coil 24 to the lower tank and
not subjected to forced cooling; the other stream
enters the upper tank 9, flows down through the
cooling core ll where it is forced cooled and
then enters lower tank Ill. The warm stream
from the coil 25 and the forced cooled stream
from the cooling core meet and mix in the lower
tank. All of the water of both‘streams passes
through pump IS, the cylinder jackets l8 and
60
the manifold l9.
When the engine load increases demanding
more fuel and therefore generating more heat,
the thermostat opens the flow inducer valve more
widely, resulting in more of the water from the
_ engine cylinder‘ jackets ?owing into the upper
tank of the radiator and less through the coil 24,
until a load condition is reached when the flow
note that the water in which the thermostat is 25
immersed now comes from the oil cooler and di
rectly re?ects the temperature of that factor
which determines the upper temperature limit for
safe engine operation, namely the lubricating oil.
It is manifest that- the multi?ow cooling sys 30
tem herein disclosed does not depend upon any
thermo-siphon flow of the liquid in the cooling
channels of the engine.
Therefore any suitable
supply of cooling liquid may be substituted for
the radiator, which is but one example of a source
of cooling liquid. Such a supply may be a river,
or a pond; the valve controlled ejector enabling
the pressure means to fill the engine cooling
channels and "prime" them for the ejector.
Moreover, the pressure means may be a city water
line.
It is understood that the cooling system herein
disclosed is such that the engine may have more
than two water channels in one or more of which
the liquid flows by induction. Also, that a single
valve controlled flow inducer can be used to con
trol the direction of water ?ow in a plurality of
water channels and to cause ?ow in them either
by induction or by pressure. It is obvious to those
skilled in the art, that various other modifications may be made in the details of. construction, the
general arrangement, the association of the sev
eral cooperating parts and the application of my
invention without departing from the spirit there
of or the principles herein set forth.
I claim as‘my invention:
1. In combination: a radiator, an engine hav~
ing two separate cooling channels each in water
circulating connectionwith said radiator, pres
sure means for imparting circulation to the water 60
in said channels, and means for varying the
diiiection of the circulation in one of said chan
ne s.
2. In combination: a radiator for cooling a
liquid, an internal combustion engine having
means for causing circulation of said liquid
through two separate channels in the engine, and
through the coil 21 ceases and all of the water means responsive to the rate of fuel consump
flows into the upper tank. All of the circulating tion of the engine for automatically connecting
water still flows through pump 96 and cylinder‘ said channels in series relation‘ or in parallel
jacket l8.
v
relation.
It is manifest that the ejector action in the
3. In combination: a radiator, an engine hav- .
flow inducer 2B depends upon suf?cient opening ing two separate cooling channels one of which
of the valve 30 and upon the velocity and pres \ is the cylinder jacket of the engine, the other
sure imparted by the pump IE to the water cir
channel being disposed in thermal association
4,
2,075,521
with the engine lubricant, pressure means for
imparting circulation to liquid from the radiator
through both channels, and means for control
ling the velocity and the direction of the "cir
culation in one of said channels.
4. In a cooling system, the combination of: a
radiator, an engine, a pressure means for cir
_ culating liquid from the radiator through a cool
ing channel in the engine, a vacuum means sup
10 plemental to the pressure means for circulating
liquid from the radiator through another cooling
channel, and valved means connectingiboth chan
nels to the upper part of the radiator.
5. In combination: a radiator, an internal com
bustion engine, a pump for circulating liquid from
the radiator through a cooling channel of the
engine, and flow inducing means for creating a
pressure difference and disposed in the path of
said circulating stream for circulating liquid from
20 the radiator through another cooling channel of >
the engine.
.
6. In combination, an internal combustion en
gine having a cooling jacket, a radiator in‘cir
culatory relationship with the jacket, a pump for
25
forcing liquid from the radiator through the
jacket, a heat transfer system having ?ow con
nections at its ends to two points in the circula
tory system, and means for passing said‘ liquid
optionally in either direction through said heat
latory system, one of said connections being be
tween the jacket and the radiator and associated
with the outlet of the jacket, said connection sur
rounding the outlet and connected to the radiator,
and means for controlling the direction of heat
transfer in the heat transfer system, including
a valve in the said one connection.
11. The combination as de?ned in claim 10
with the addition of means responsivev to the
temperature of said liquid for operating said
valve.
12. In combination: a radiator for cooling 9.
liquid, an engine having two separate cooling
channels for receiving said liquid, a pump for
imparting forced circulation of said liquid
through one said channels, and means supple
mental to said pump for creating a pressure dif
ference by“ the .aid of said forced circulation to
induce flow of the liquid in the other channel.
13. In a cooling system, the combination of: a '
radiator, an engine having a plurality of sepa
rate cooling channels in water circulating con
nection with the lower part of the radiator, and
means comprising a nozzle and a valve for con
necting said channels to the upper part of the
radiator.
14. A combination such as defined in claim 13
in which said valve is operatively connected to
a thermostat disposed in the path of said circu
30 transfer system.
7. In combination, an internal combustion en
lating water. _
gine having a cooling jacket, a radiator in cir
culatory relationship with the jacket, a pump
for forcing liquid from the radiator through the
-" Jacket, a heat transfer system having ?ow con
nections at its ends to two points in the circu
latory system, and means for passing said liquid
optionally in either direction through said heat
transfer system, including a valve in one of said
40 flow connections.
in which said valve is operatively connected to
the gas admission mechanism of the engine.
16. In combination: a radiator, an engine hav
ing two separate cooling channels, a pump for
circulating liquid from the radiator through one
of said channels, ?ow inducing means supple
mental to the pump and disposed in the path of
8. In combination, an internal combustion en
gine having a cooling jacket, a radiator in cir
culatory relationship with; the jacket, a pump
for forcing liquid from the radiator through the
45 jacket, a heat transfer system having ?ow con
nections at its ends to two ?ow points in the
circulatory system, one of said connections being
between the jacket and the radiator and asso
ciated with the outlet of the jacket, said con
50 nection surrounding the outlet and connected to
the radiator, and means for passing said liquid
optionally in either direction through the heat
transfer system.
' 15. A combination such as de?ned in claim 13
said circulating stream for circulating liquid from‘
the radiator through the'other of said channels,
and means comprising a valve for controlling the
circulation of said liquid.
.
17. In combination: a radiator for cooling a
liquid and having two outlets from its lower tank,
an engine containing a cooling channel for re
ceiving said liquid, a pump connecting one of 45
said outlets to said channel for circulating said
liquid therethrough, a second cooling channel for
the engine connected to the second of said outlets
and bypassing the first channel, and means in 60
cluding a flow inducer and a valve for connect
ing both channels to the upper part of the ra
diator.
‘
.
‘
9. In combination, an internal combustion en
18. A combination such as defined in claim 1'7
culatory relationship with the jacket, a pump
in which said flow inducer means is an ejector 66
having three passagesfor said liquid two of said
passages being concentrically disposed both lead
55 gine having a cooling jacket, a radiator in cir
for forcing liquid from the radiator through the
ing into the third passage which forms a common
Jacket, a heat transfer system having ?ow con
ori?ce for the other two and said third passage
nections
at
its
ends
to
two
?ow
points
in
the
60
circulatory system, one of said connections being ‘leading into the upper tank of the radiator, the
said pump connected channel of the engine lead
between the jacket and the radiator and asso
ciated with the outlet of the jacket, said con _ ing into the inner of the two concentric passages,
nection surrounding the outlet and connected to and the said second channel leading into the
outer of the concentric passages; said valve in
65 the radiator, and means for passing said liquid said means being disposed in the third passage.
optionally in either direction through the heat
19. A combination such as defined in claim 17
transfer system, including a valve in said con
in which the said second channel is disposed in
nection interposed between the radiator and the the oil reservoir of the engine.
outlet from the jacket.
20. In combination: a radiator for cooling a
70
10. In combination: an internal combustion liquid, an engine having two separate cooling
v70
engine having a. cooling jacket, a radiator in cir
channels each of which has separate connection
culatory relationship with the jacket, a pump with the lower part of the radiator, positive pres- '
for forcing liquid from the radiator through the sure means for circulating said liquid through
jacket, a, heat transfer system having ?ow con
one of said channels, ?ow inducing means for
75 nections at its ends to two points in the circu
circulating said liquid through the other chan— 75
5
ao'iaeai
nel, and a valved conduit for connecting both
channels to the upper part of the radiator.
28. In combination: an internal combustion
engine, a radiator for cooling liquid received from '
21. A combination such as de?ned in claim 20
the engine, a pump for forcing cooled liquid from
in which said valve is operatively connected to
e the gas admission mechanism oi the engine.
22. In combination: a radiator, an engine hav
ing a cylinder jacket, an oil cooler for the engine,
the radiator through the cylinder jacket of the
a pump for circulating cooled water from the‘
radiator through the cylinder jacket, ‘a conduit
30 for conducting cooled water from the radiator
into the oil cooler, means comprising an ejector
for connecting the cylinder jacket and the oil
cooler to the upper part of the radiator, and a
valve for controlling the ?ow of liquid to the
15 radiator.
- .
23. In combination: a radiator, an engine ha -
ing two separate cooling channels one of which
is the cylinder jacket of the engine, pressure
means for circulating cooled liquid from the ra
20 diator-through one of said channels, an ejector
engine,_an oil cooler iorthe engine, a conduit
for conducting cooled liquid from the radiator to
the oil cooler, and an ejector ?ow inducer for con-'
ducting said liquid from the cylinder jacket and
the oil cooler into the hot liquid receptacle of,
the radiator.
_
\
10
r
29. In combination: a radiator for cooling a
liquid, an internal combustion engine having a
cooling channel and a heat exchanging channel,
pressure means for forcing said liquid through
one of said channels, and means including a 15
nozzle and a constricted passageway in the path
of said liquid for inducing flow of said liquid
through the other channel. '
30. In ‘combination: an internal combustion
engine having two cooling'channels adapted to 20
for circulating cooled liquid from the radiatorv receive a cooling liquid, one of said channels be
through the other channel, and valved means for ing a cylinder jacket, a pump connected to one
connecting both channels to the upper part “of of said channels for imparting forced pressure to
saidliquid, and, means comprising an ejector for
the radiator.
25
24. In combination: a radiator, an engine hav-' connecting said channels with each other and 25
- ing a plurality of separate cooling channels in vfor receiving said liquid therefrom, said ejector
water circulating connection with the lower part having a. nozzle through which the liquid from
the cylinder jacket enters the ejector.
of the radiator, and a valve controlled ?ow in
ducer consisting of a housing containing a nozzle
31. The combination as de?ned in claim 30
30 and a valve and having a plurality of inlets for , in which said other channel is in thermal asso
receiving the water flow from said channels and
having a common outlet for connecting the ?ow
inducer to the upper part of the radiator, said
nozzle being ‘disposed in axial alignment with
35 one of said inlets and said commonoutlet, said
valve being disposed in the common outlet.
25. In combination, a radiator for cooling a
liquid, an engine having two separate channels
for receiving said liquid, 2. pump for imparting
40 torced circulation to said liquid through one of
said channels, means for utilizing said forced cir
culation to create a pressure difference and there
by to induce ?ow of the liquid in the second of
said channels, and valve means in the ?rst of
45 said channels for regulating the circulation of
said liquid in said second channel.
,
‘
26. In combination: a radiator, an engine hav~
ing two separate cooling channels, means for
connecting each of said channels separately to
50 the lower part of the radiator, and means com
_ 32. In combination: an internal combustion
engine having two separate cooling channels
adapted to receive a cooling. liquid, and means
connecting an end of one of said channels with 35
van end of the other channel, said means com
prising a valve for connecting said channels either
in series relation or in parallel relation.
33. In combination: an internal combustion
engine having two separate cooling channels 40
adapted to receive a cooling liquid, one of said
channels being the cylinder jacket of the engine,
and means connecting an end of one of said
channels with an end of the other channel, said
means comprising a'valve for connecting said 45
channels eitherv in series relation or in parallel
relation.
7
34. In combination: an internal combustion
engine having two separate cooling channels each
adapted to receive a cooling liquid, one of said 50
prising an ejector for connecting both channels
to the upper part of the radiator.
channels being disposed in thermal association
with the engine lubricant, and means connect
27. In a cooling system for an engine contain
ing an end of one of said channels with an end
of ‘the other channel, said means comprising a
ing a cooling channel, the combination of: a
I 55 radiator, pressure means for circulating cooled‘
valve for connecting/said channels either in series 55
liquid from the radiator through said channel,
relation or in, parallel relation.
a second cooling channel connected to the radia
35. The combination as de?ned in claim 34
and including a, thermostat for controlling said
tor for receiving cooled liquid therefrom and by
passing the ?rst channel, and means comprising
60 an ejector for conducting the liquid from both
channels into the upper part or the radiator.
30
ciation with the lubricant of the engine.
valve.
.
‘
-'
FREDERIC W. HILD.
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