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Патент USA US3068856

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Dec. 18, 1962
H. L. WARD
3,068,846
EXPANSION SYSTEM FOR ENGINE COOLANT
Filed Feb. 27, 1961
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3,068,846
EXPANSIGN SYSTEM FOR ENGENE CGGLANT
Harold L. Ward, Peoria, EL, assignor to Caterpillar
Tractor (30., Peoria, ili.,_a corporation of California
Filed Feb. 27, 1961, Ser. No. 91,677
1 (Ilaim. (Cl. 123-411)
3,368,846
Patented Dec. 18, 19452
monly used in marine installations. The raw water con
nections to the exchanger are not herein illustrated.
A conduit 21 communicates between the heat exchanger
and the lower portion of the reservoir 11 completing the
cycle.
The purpose of the temperature regulated valve 17
is to prevent circulation of coolant through the heat ex
changer when the engine is cold as for example when it
This invention relates to engine cooling systems and
is ?rst started. Under this condition the valve 17 is
particularly to a system that provides for expansion of
fluid coolant in a structure which does not exceed the 10 closed and water from the engine is bypassed or ?ows
directly through a line 30 betwen the cylinder head, water
height of the engine. In many engine installations, of
jacket and the reservoir 11 until the temperature of the
which marine installations provide a good example, space
coolant rises to the desired operating level and effects
is limited and it is desirable that the cooling system and
opening of the valve 17.
other appurtenances of the engine do not exceed the
The reservoir is provided with a conventional ?lling
basic pro?le of the main engine structure and this is 15
spout and cap as shown at 31 and within the reservoir
particularly true in the vertical dimension.
downwardly extending baffle 32 surrounds the position of
Expansion tanks are used in cooling system to accom
the ?lling spout and isolates the remainder of the upper
modate the increased volume of the cooling ?uid caused
portion of the reservoir providing an expansion chamber
by the heat of engine operation. Unless such tanks are
disposed to exceed the height of the engine the cooling 20 33 which as shown in FIG. 2 occupies both sides and
the forward portion of the top of the reservoir. In this
system cannot be completely ?lled without also ?lling the
expansion chamber is a pressure actuated vent or relief
tank. Engine manufacturers using low tanks are ex
valve 34 of any suitable conventional type. As shown
periencing dif?culties with spillage. Spillage detracts from
in FIG. 3 the high level of coolant in the reservoir is
the general appearance and cleanliness of the engine and
its compartment, and coolant containing anti-freeze agents 25 equal to that in the engine head block and air in the
expansion chamber 33 is at substantially the same level.
is undesirable in bilges because of its tendency to evap
orate slowly. Furthermore, without space for expansion
any vent in the system permits loss of coolant.
Consequently, the engine cooling system may be ?lled
through the ?lling spout 31 and all parts thereof will be
It is an object of the present invention to provide an
expansion tank for an engine cooling system which may
be disposed below the highest part of the engine and
particularly the top of the cylinder head but will insure
adequate space for expansion of engine coolant under all
?lled as the coolant seeks a common level in them with
the exception of the return bend 18 which is higher than
the water level in the head block. To prevent an air
lock as coolant is rising in the line 19 a small vent line
35 communicates between the upper portion of the return
bend and the top of the reservoir. The ba?ie 32 produces
operating conditions.
Further objects and advantages of the invention are 35 an air lock which prevents the rise of coolant in the
reservoir as it is being ?lled to insure the presence of air
made apparent in the following speci?cation wherein ref
erence is made to the accompanying drawing illustrating
in the expansion chamber 33. Therefore, because of the
a preferred form of the invention.
ba?le 32 an air space or expansion chamber is provided
In the drawing:
vFIG. 1 is a schematic view in :front elevation of an
engine showing the externally disposed parts of its cooling
system;
below the normal level of liquid in the cooling system.
During operation of the engine the return bend 18 is of
course ?lled because the ?uid is under pressure from the
pump and as expansion takes place due to the heat of
engine operation pressure in the system opens the vent 34
FIG. 2 is a fragmentary sectional view taken on the
venting air rather than liquid ‘from the system.
line II—II of FIG. 1; and
I claim:
‘FIG. 3 is a fragmentary sectional View taken on the 46
In an engine having the usual cooling jackets a heat
line III—III of FIG. 1.
exchanger, a reservoir, a pump for circulating ?uid there
A typical engine is shown in FIG. 1 at 10 and a reser
through, and a thermostatic valve and bypass to prevent
voir 11 for coolant is disposed in front of the engine in
circulation through the heat exchanger when the engine
such position that it does not exceed the overall height of
the engine, the top of which may be seen at 12 in FIG. 1. 50 is cool, the improvement which comprises said reservoir
being no higher than the engine and having a top open
A pump 13, which is engine driven, withdraws coolant
ing ?lling spout and a downwardly extending ba?le sur
from reservoir 11 through a passage 14 and forces the
rounding said spout to provide an expansion chamber
in the top of the reservoir, a passageway between the
charge line 15 (see FIG. 2) and into the water jacket
of the cylinder block from which it passes upwardly into 55 engine and heat exchanger extending to a point above
coolant in a conventional manner through a pump dis
the cylinder head all in a conventional manner and is
discharged through a temperature regulator housing 16
having a conventional temperature regulated valve 17
the engine, and an air vent line between said passageway
and the top of said reservoir.
References Cited in the ?le of this patent
therein. From the valve 17 the coolant ?ows through a 60
UNITED STATES PATENTS
return bend 18 thence downwardly through a line 19 to
a heat exchanger 20. This heat exchanger may be of
1,658,934
Muir _______________ __ Feb. 14, 1928
2,067,407
Milligan ____________ _._. Jan. 12, 1937
any conventional type, the raw water type being com
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