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Патент USA US2123358

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July 12, 1938.
Filed Jan. 29, 1937
2 Sheets-Sheet l,
July 12, 1938.
ENGINE .sxpsncnie noon
Filed Jan._ 29, 1937
2 Sheets-Sheet 2 _
Patented .July 12, 1938
. 2,123,358
Fritz Paul Grutzuer, Bcloit, Wis, assignor to
Fairbanks, Morse & 00., Chicago, 111., a cor
poration oi.‘ Illinois’
Application January 29, 1937, Serial No. 122,928
,5 Claims. (Cl. 123—198)
sound- and vibration-damping mountings l4.
This invention relates to means for suppress
ing noise attending the operation of internal Such mountings desirably comprise a bracket l5
combustion engines, and more particularly to an
improved silencing hood for internal combustion
6 engines, especially useful for Diesel-generator in
stallations in residences, stores, theatres, and the
An object of the invention is to provide an im
fastened to the sub-base, a companion bracket l6
embedded or otherwise ?xed to the foundation,
and rubber blocks I‘! which interconnect vertical 5
proved silencing hood of the‘character described
10 which is adapted to ?t closely about the driving
member of a Diesel-generator unit to completely
house the same, and which is so constructed and
mounted as to be readily removed and replaced
for purposes of engine inspection or repair.
Other objects and advantages will appear from
the following detailed description and drawings
accompanying the same, setting forth preferred
embodiments of the invention as applied to a Die
sci-generating unit.
In the drawings, Fig. l. is a side elevational View
of such unit and silencing hood, with portions
broken away to illustrate the preferred construc
tion; Fig. 2 is an end elevation of the assembly
illustrated in Fig. l with a portion of the silencing
25 hood broken away; Fig. 3 is a sectional view taken
at line 3--3 of Fig. l, and Fig. ‘i is an end eleva
tion of an engine assembly and silencing hood '
therefor of alternate design.
Referring now by characters of reference to
30 the drawings, a Diesel-electric generating unit to
which the silencing hood of the present invention
is especially applicable includes an electric gen
erator 5 operatively connected by a suitable cou
pling to the crank shaft of the engine, designated
35 8. The engine and generator are mounted on a
arms of brackets l5 and I6.
The silencing hood is designed and constructed
to ?t over and enclose completely that part of
the engine structure which rises above the sub
base. The hood embodies a rounded top portion 10
it! which merges into vertical side walls l9 that
terminate downwardly at the supporting ?anges
l3, and end walls 20 that are substantially co
planar with the sub-base end walls l l. The hood
is divided longitudinally into two complementary 15
sections at a vertical, medial plane, the sections
being detachably secured together by threaded
elements 2! which engage ?anges 22 disposed at
the mating margins of the paired sections.
Each hood section preferably includes an outer 20
casing member 23 of sheet metal, and a shell 24
spaced inwardly of the casing 23, the casing and
shell de?ning an air chamber 25 therebetween.
At the inner surface of shell 24 is a layer 26 of
sound-absorbing material such as felt or asbestos 25
?bre, con?ned between shell 26 and a foraminous
or reticulate inner lining member 21.
Detachable securement of the hood to the sub—
base structure is preferably accomplished by
means of bolts 28 pivoted on arms 28 which ex- 30 ’
tend laterally from ?anges E3, the bolts being
adapted to be swung into bifurcated, laterally
projecting lugs 32 on the hood, wing-nuts 3i on
bolts 28 serving to clamp the hood to the sub
base. The broken line showing in Fig. 2 illus- 35
trates one of the hood sections as detached and
unitary sub-base '5 having anchoring ?anges 8
from its mating section’.
at the lower side edgesvthereoi; That portion of displaced
Combustion air is drawn into the engine cham
the sub-base which underlies and supports the her through a ?lter silencer 32, of conventional
engine is substantially of box-like construction, type, mounted on one end of an intake pipe 33 40
40 having a bottom wall 9, side walls E0, and endwalls which extends through an end wall of the hood. ii. A top plate i2, surmcunting side and end
That potrion of the intake pipe which isdisposed
walls l0 and il,'has suitable openings therein to internally of the hood extends substantially par
accommodate the engine ?ywheel, oil-pan and allel to the end wall and is provided with a mul
other portions of the engine which extend below tiplicityof perforations. An open-ended sound- 45
45 the crank shaft. Side margins of the top plate absorbing casing 34 carried by the hood surrounds
l2 project outwardly beyond the side walls in of the perforated portion of the air intake pipe.
the sub-base, providing horizontal ?anges l3 for The assembly thus described provides an eiiective
receiving and supporting the silencing hood. For
purposes of damping vibration and minimizing muliier which checks sound transmission through
the air intake opening in the hood.
60 the drum e?ect of the box-like sub-base, the same
Exhaust gases are discharged through a pipe
may be partly ?lled with sand or gravel.
35 which projects through an opening .at the
The sub-base is preferably anchored to a con
crete foundation or other solid footing, which
may constitute the ?ooring of the room in which
55 the unit is installed, by means of suitably spaced
juncture of the upper edges of the casing sec- .
tions, such opening being formed by comple
mentary, semi-circular recesses in the casing 55
sections. It is desirable to protect the sound
absorblng material 26 from heat from the exhaust
with a water jacket 36 supplied with cooling ?uid
her and shell, and sound-absorbing material-?ll
ing the space between the inner casing member
and shell, said hood being divided at a vertical,
longitudinal medial plane into paired, comple
which also serves to cool the engine.
mental sections, and means detachably securing ,
pipe 35, and accordingly the' latter isprovided
The hood
sections are adapted to _?t snugly around the
jacket 36 as ‘best appears from Fig. 3. Flexible
said sections together.
2. In combination with an internal combus
tion engine, a base structure supporting the en
gine, a silencing hood ‘enclosing the engine and
exhaust tubing, a portion of which is indicated
at 31, Fig. 2, connects with pipe 35 by means of
a ?anged union 38, serving to conduct gases to carried by said ,base structure, said hood compris
the desired point of discharge. By the provision ing top, side and end walls and being divided into
of ?exible exhaust tubing, the transmission of_ complemental sections at a vertical, longitudinal,
engine vibration and sound through this connec~ medial plane, means detachably securing said
‘tion is avoided.
vhood sections together, and means detachably se
- 1'5
Cooling water is conducted through ?exible-tub
curing the hood to said base structure.
ing 39,_Fig. 1, and a water pipe 40 which extends
3. An engine-enclosing and sound-proo?ng
through openings in the engine sub-base. Metal structure including a base portion, - horizontally
to metal contactbetweenpipe 60 and the engine projecting ?anges at the bottom of the base por
supporting structure is prevented by rubber sleeves tion for securement thereof to a ?oor or like sub
2.0 4| which line the openings in the sub-base through jacent support, a plurality of horizontal projecting
=which the water pipe extends. A conduit 42 con
?anges carried by the upper wall portions of the
nects the engine water jacket with the exhaust base and attached directly to support the engine,
pipe water jacket 36, the cooling water being disr an upper housing portion formed of a plurality of
charged from the assembly through pipe 43. > detachably connected sections and characterized
Connections for fuel and lubricating oil are made by spaced wall elements, a layer of ?brous sound
through the sub-base, rubber silencing sleeves proo?ng material between a pair of said wall ele-' 25 ~
being provided at the conduit-openings for the ments, a plurality of ports or openings in said I
fuel and oil pipes 44 and“ respectively. The en
upper enclosure and adapted to receive air and
gine starting and speed controls 46 in the present exhaust piping for the engine, and means for de
'30 illustration shown as being inside'the hood, may tachably securing the upper enclosure to said base
be extended through suitable openings in the structure.
'hood for external manipulation, in which event
4. In an engine-enclosing and sound-proo?ng
the opening in the hood for the control member structure, a hood formed of connected sections and
should be provided with a rubber silencing sleeve. adapted to be disposed about the upper portion of
An alternative construction of the silencing the engine, said hood being provided with open
hood illustrated in Fig. 4 shows the hood extend
ings to accommodate the ‘engine air- and exhaust 3.5
ing to the ?oor or foundation, and being spaced. _piping, and a hollow element in one of said open
on all ‘sides from the engine. The hood is split ings providing a water jacket and adapted for
centrally, and is similar in general construction connection to the engine cooling system, said ele
40 to the hood illustrated in Figs. 1 and 2. .However
ment adaptedv to enclose 'an engine exhaust con
duit and tending thermally to insulate said con
duit for water, oil exhaust gases and fuel should ‘ duit from the hood structure.
extend between the engine and hood to permit the
5. _In an engine-enclosing and sound-proo?ng
engine to oscillate on its resilient mounting rela
structure, a hollow structure formed of detachably
45 tively to the ?xed hood, and to prevent transmis
connected sections and a layer of ?brous insulat
when this hood assembly is employed, ?exible con
sion of sound and vibration to the hood.
Having thus described my invention, what I
claim and desire to secure by Letters Patent is:
1. A silencing hood for stationary internal com
50 bustion engines comprising a perforated inner
casing member, an imperforate outer casing mem
. ber paralleling said inner member, an'intermedi
'ate shell spaced between said inner casing mem
ing material carried by the walls of the hood struc
ture, said structure being provided, between a pair
of its connected sections, with an opening to pass
the exhaust line from the engine, and an annular
water jacket member adapted for connection to
the engine cooling system, and disposed in said
opening about the exhaust pipe.
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