U.S. patent number 3,695,386 [Application Number 05/020,758] was granted by the patent office on 1972-10-03 for sound-proofing component.
This patent grant is currently assigned to Hans List. Invention is credited to Heinz Fachbach, Gerhard Thien.
United States Patent |
3,695,386 |
Thien , et al. |
October 3, 1972 |
SOUND-PROOFING COMPONENT
Abstract
A component for sound proofing internal combustion engines
having two frame members attached to the surface of the engine and
arranged in spaced relation to the engine and spaced from each
other with sound proofing packing between the frame members.
Inventors: |
Thien; Gerhard (Graz,
OE), Fachbach; Heinz (Graz, OE) |
Assignee: |
List; Hans (Graz,
OE)
|
Family
ID: |
3540532 |
Appl.
No.: |
05/020,758 |
Filed: |
March 18, 1970 |
Foreign Application Priority Data
|
|
|
|
|
Mar 20, 1969 [OE] |
|
|
A 2802/69 |
|
Current U.S.
Class: |
181/204;
123/195C |
Current CPC
Class: |
G10K
11/16 (20130101); F02F 7/008 (20130101); F02B
77/13 (20130101); F01M 2011/0008 (20130101); F01M
2011/0054 (20130101) |
Current International
Class: |
F02B
77/11 (20060101); F02B 77/13 (20060101); F02F
7/00 (20060101); G10K 11/16 (20060101); G10K
11/00 (20060101); F01M 11/00 (20060101); F02f
007/00 (); F16m 001/00 (); G10k 011/00 () |
Field of
Search: |
;181/33K,33A,33G,33R
;123/195C,198E,52MC,41.70,41.07 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Wilkinson; Richard B.
Assistant Examiner: Gonzales; John F.
Claims
We claim:
1. A component for the soundproof sheathing of internal combustion
engines, comprising a first frame member rigidly attached to an
outer surface of the internal combustion engine, a second frame
member covering at least part of the said outer surface and
arranged in spaced relation to and in front of the said first frame
member, a soundproofing packing located between the said two frame
members and tightly connected with same along a continuous series
of lines, at least one of the said frame members being a strip
having a mounting rim laterally protruding from the said
packing.
2. A component according to claim 1, comprising a connecting plate
mounted on the outer surface of the internal combustion engine, the
said strip-shaped frame member being rigidly connected with the
outer rim of the said connecting plate along its mounting rim.
3. A component according to claim 2, wherein the said rims of the
strip and of the connecting plate are interconnected by
welding.
4. A component according to claim 2, wherein the said rims of the
strip and of the connecting plate are interconnected by gluing.
5. A component according to claim 2, wherein the said rims of the
strip and of the connecting plate are interconnected by flanging.
Description
The invention relates to a sound-proofing component for the
sheathing of machines, particularly of internal combustion
engines.
Efforts to control excessive engine noise have been responsible for
the development of a number of more or less effective components
for the principal purpose of screening the machine off sound
radiations emanating from the outer walls of the machine. However,
similar components of conventional design present certain
shortcomings both with regard to their installation and operation,
in addition to being generally responsible for a considerable
increase of the weight of the machine.
Particularly in an internal combustion engine of a known design,
the cylinder block, as different from conventional casting types,
is formed by a framework made of steel plates and covered on both
sides and in the area of the crankcase by sound-proofing multilayer
plates called sandwich metal sheets. In their plainest form these
sound-proofing elements consist of two massive steel plates
arranged in spaced relation to each other, and interconnected by
means of an interposed layer of sound-proofing material in such a
manner that the inside steel plate only is screwed onto the
crankshaft housing with the interposition of packing strips.
However, this type of sound-proofing is highly objectionable
insofar as it strongly impairs the abduction of heat from the
cylinder block towards its surroundings, inasmuch as in view of its
low thermal conductively the sound-absorbing material also acts in
a heat-insulating capacity. This leads to an objectionable rise of
the oil temperature which will have to be compensated by
appropriate measures such as for example, the provision of a
large-sized oil cooler.
It is therefore, the object of the present invention to provide an
easily installable and adaptable component for the sound-proof
sheathing of machines avoiding the shortcomings of known devices.
According to the invention such a component is characterized by a
first frame member rigidly attached to the outside of the machine
and by a second frame member arranged in spaced relation to and in
front of, the first and connected with the same by means of a
sound-proofing packing along a continuous series of lines, the said
second frame member covering at least part of the outer surface of
the machine and/or serving as a support for one or several
encasements.
Experience goes to show that such a component of plain design
presents sound-proofing properties of a surprisingly high degree
despite the deliberate omission of sound-absorbing intermediate
layers, without impairing the exchange of heat between the machine
and its surroundings.
The framework construction of the component according to the
invention offers not only the advantage of its low weight, but in
addition the possibility of providing a component of appropriate
rigidity to be used also as a supporting element. Furthermore,
where the external second frame member is so designed as to serve
as a support for encasements, it will be possible for such elements
as are directly associated with the machine, such as the oil sump
of an internal combustion engine for example, to be attached to the
said second frame member as encasements. This further simplifies
the overall design of the machine and additionally helps reduce its
weight.
According to a preferred embodiment of the invention, one of the
two frame members is designed as a closed, possibly arched plate
and/or reinforced by means of corrugations. This design is
particularly suitable for the sound-proofing encasement of large
surfaces of the machine. Where a very tight connection between the
component and its mounting surfaces on the machine is required, it
will be preferable to attach the component with its plate-shaped
rim rigidly to the machine and to provide an additional sealing
between the plate and its mounting surfaces on the housing, such as
by means of a sealing compound of profile washers.
According to another embodiment of the invention at least one of
the two frame members can be designed at least one of the two frame
members can be designed as a strip having a mounting rim protruding
from the packing either on one side or both. The encasements
provided can be attached to the mounting rim in any convenient
manner such as by screwing, gluing or rivetting. If desirable in
view of the particular shape of the encasements to be mounted, it
is also possible for the mounting rim of the strip-shaped frame
member to be of angular-shaped or of any other convenient form.
According to a further feature of the invention the strip-shaped
frame member can be attached alongside its mounting rim to the rim
of a connecting plate provided on the outer surface of the machine
by welding, gluing, flanging or the like. In that case, the
additional connecting plate provides positive sealing of the
encased machine compartment against the outside. The encasements
mounted on the second sound-proofing frame member or the external
frame member designed as a plate are exclusively used for
sound-proofing purposes. The distance between the additional
connecting plate and the sound-proofing plate in front of it is of
particular importance for the sound-proofing capacity of the
component according to the invention. The most convenient distance
should be determined by trial and error.
According to a further embodiment of the invention the packing made
of rubber, synthetic material or the like is attached to the two
frame members by vulcanization or gluing. In particular, attachment
by vulcanization is feasible only in connection with a component
according to the invention, since at least one of its frame members
is open-worked so that the packing can be easily heated to the
required uniform vulcanization temperature.
In some cases it will be preferable to provide an additional
support for the second frame member or for an encasement attached
thereto by means of at least one sound-proofing supporting element
mounted on the outer surface of the machine or on the first frame
member. This helps eliminate objectionable vibrations particularly
where large-sized encasements are used. The provision of additional
supporting elements may, however, prove useful also for
considerations of a mechanical nature.
Further details of the invention will appear from the following
description of several embodiments of the invention with reference
to the accompanying drawing in which
FIG. 1 shows a diagrammatic cross-sectional view of the cylinder
block of an internal combustion engine encased by means of
sound-proofing components according to the invention,
FIG. 2 illustrates a detail of FIG. 1 on a larger scale, and
FIGS. 3 to 5 are cross-sectional view of various types of
sound-proofing components according to the invention,
FIG. 6 is a diagrammatic cross-sectional view of yet another
embodiment of the invention, and
FIG. 7 is a cross-sectional view on line VII--VII of FIG. 6.
As shown in FIG. 1, the housing 1 of an internal combustion engine
is provided with a sound-proofing sheathing substantially
comprising two sound-proofing components 4 and 5 spaced in front of
the two side-walls 2 and 3 of the housing 1, and a further
sound-proofing component 6 arranged on the lower rim of the housing
1 and to which the oil sump 7 is attached.
The essentially identical components 4 and 5 comprise a first frame
member 10 rigidly mounted on the housing 1 by means of bolts 8 with
the interposition of a continuous profile washer 9 and connected to
a plate-shaped second frame member 11 by means of a continuous
elastic packing 12 in such a manner as to provide effective sound
isolation. The packing 12 made of rubber for example, extends
alongside the first-mentioned frame member 10 and is positively and
tightly attached thereto and also to the plate-shaped frame member
1 by vulcanization or gluing. The plate-shaped frame member 11 is
reinforced by means of horizontal and vertical corrugations 13 and
14.
At the points of attachment of the sound-proofing components 4 and
5 on the housing 1, the frame member 10 and the packing 12 are
somewhat enlarged for receiving the bolts 8. The bolts 8 are
countersunk in a stepped through bore 15 and rest with the
interposition of a circlip 16 upon the annular shoulder formed by
the bore 15 on the inner frame member 10.
The component 6 mounted on the underside of the housing 1 also
comprises two frame members 10' and 11' interconnected by means of
a sound-proofing elastic packing 12' and screwed to the lower rim
of the housing 1 with the interposition of a continuous profile
washer 9' . The strip forming the outer frame member 11' presents a
mounting rim protruding inwardly from the packing 12' , the upper
rim 17 of the oil sump 7 being attached to the said mounting rim by
means of an oiltight flange 18. Thus the coil sump 7 forms a
sound-proofing encasement attached to the housing 1 and serving to
screen off sound radiation from the housing 1 downwards.
The oiltight and substantially bend-resisting design of the
sound-proofing components 4 and 5 makes is possible for the
sidewalls 2 and 3 of the housing 1 to be provided with large-area
recesses in such a manner that the components 4 and 5 themselves
form the oil-wetted outer walls of the housing 1. This eliminates
the need for providing double-walled outer surfaces of the housing
and helps save much weight. Likewise, the front walls of the
housing 1 could be sheathed by means of sound-proofing components
of a similar design in such a manner as to inhibit heat radiation
from the machine on all sides.
FIG. 3 shows a particularly plain type of component designed
according to the invention. The inner frame member 20 directly
adjoining the body 19 of the machine to be sound-proofed is
designed as through plate and the second frame member 21 connected
therewith by means of a sound-proofing elastic packing 22 as a
strip with an inwardly protruding mounting rim. Alongside this rim
a plate-shaped encasement 23 is positively connected with the frame
member 21 in any convenient manner such as by gluing the members 21
and 23 (right side of FIG. 3) or by means of rivets 24 (left side
of FIG. 3).
According to the embodiment of the invention illustrated in FIG. 4,
the two frame members 20' and 21' of the sound-proofing component
are designed as strips having a laterally protruding mounting rim,
a separate connecting plate 25 directly adjoining the machine body
19 presenting a laterally protruding rim to which the inner frame
member 20' of the sound-proofing component is attached. The members
20' and 25 can be interconnected by any convenient method, such as
for example by welding (right side of FIG. 4) or by flanging (left
side of FIG. 4). An encasement 26 forming a salient bonnet is
attached to the mounting rim of the outer frame member 21 by means
of rivets 27 (right side of FIG. 4) or self-tapping screws 28 (left
side of FIG. 4).
The component shown in FIG. 5 comprises a strip-shaped inner frame
member 20" and a plate-shaped outer frame member 21' connected
therewith by means of a sound-proofing elastic packing 22. This
design also uses a separate connecting plate 25' directly adjoining
the machine body 19. The plate 25' can either by mounted on the
machine body 19 jointly with the frame member 20" by means of bolts
8 (right side of FIG. 5) or else the members 25' and 20" are
interconnected by flanging at the rim (left side of FIG. 5).
FIG. 6 illustrates the sound-proofing connection of an oil sump 29
to the lower rim of the housing 1' of an internal combustion engine
(not shown). The oil sump is mounted thereon by means of a
sound-proofing component 6' comprising a first frame member 30
designed as a sectional strip and a second strip-shaped frame
member 32, interconnected by means of a sound-proofing elastic
packing 32. The component 6' is mounted on the housing 1' by means
of bolts 8 with the interposition of a profile washer 33. The frame
member 31 has an inwardly protruding mounting rim to which the
inwardly bent upper rim 42 of the oil sump 29 is attached by
welding.
The oil sump 29 rests upon the housing 1 of the machine supported
by an additional supporting element 34 in such a manner as to
provide positive sound-proofing. The supporting element 34
comprises a stay bolt 35 screwed into the housing 1' and carrying a
covering hood 36, an adjacent tubular sleeve 37, a washer 38 and a
nut 39. Shrunk on the sleeve 37 is an elastic bushing 40 made of
sound-proofing material such as rubber, and preferably positively
connected with the sleeve 37 by vulcanization or gluing. The
elastic bushing 40 protrudes into a bell-shaped recess 41 of the
oil sump 29 and rests on the open-worked bottom of same. The
bushing 40 can be mounted in the recess 41 also by vulcanization or
gluing. The additional supporting element 34 carries part of the
weight of the oil sump 29 and at the same time serves to suppress
any operational vibrations of the oil sump.
* * * * *