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Патент USA US3077218

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Feb. 12, 1963
3,077,206
R; W- GRAHAM
7 AIR SUSPENSION CONTROL APPARATUS
Filed March 4, 1959
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IN VENTOR.
BY @Jezz??殚day
T TORNE Y
United States Patent 0 Pice
1
3,077,265
Patented Feb. 12, 1963
1
2
3,ii77,2i)d
A plurality of coils at the inner end of element 18 sur
roundingly engage a plug element 2t) which abuttingly
engages the open inner end 22 of tube 14 when spring 18
AER SUSPENdlUN CUNTR?L APPARATUS
Robert W. Graham, Plirrninghain, Mich? assignor to Gen
ral Motors Corporation, Detroit, Mich, a corporation
of Delaware
Filed Mar. 4, i959, Ser. No. 797,221
5 Claims. (Cl. 137-=)
This invention relates to vehicle air suspension high
is in its normal unexpanded condition. in pactice, the
axial position of plug 20 in spring 18 is adjusted so that
face 24 of plug 2% exerts a suf?cient pressure on the end
of tube 14 to provide an air tight seal at the juncture of
tube 13 and the face 24 of plug 2%. In order to assure
effectiveness of sealing engagement between plug 2%? and
pressure storage tanks and more particularly to control 10 the end 22 or" tube 14, the face portion 24 of the former
apparatus therefor.
is preferably formed of resilient material such as rubber
In prior art air suspension systems in which the high
which is bonded to the main body of the pluv. Alter
pressure storage tank is equipped with an inlet mounted
natively plug 24.} may be formed entirely of rubber-like
muffler assembly, it has been customary to locate a check
material.
valve in the pressure line at some point between the tank 15
In operation, the evice functions as follows. Con.
and the source of compressed air.
pressed air supplied by an engine driven compressor, not
An object of the present invention is to provide a sim
shown, enters the inlet ori?ce d of ?tting 6, passes through
pliiied and improved check valve and mufller assembly
tube 14 toward the inner end 22 thereof and exerts pres
for air suspension high pressure storage tanks.
sure on plug 28, causing the latter to unseat. As a result
Another object is to provide a combined Inu?ler and 20 of the axial movement of plug 2% incident to unseating
check valve assembly.
thereof, the individual coils of coil spring 18 are caused
A further object is to provide a surge mu?ler assembly
to separate slightly (as shown in exaggerated form in
for an air suspension high pressure storage tank which is
FIG. 2) thereby providing a continuous helical slit-like
constructed and arranged so as to prevent back?ow of
opening extending from the outer to the inner end of the
compressed air from the tank to the source of compressed 25 spring. Air emerging from open end 22 of tube 14 is
air.
therefore constrained to pass through the slit-like open
Still another object is to provide a device of the type
ing before emerging into high pressure tank 2. Because
described including a tightly wound coil spring arranged
of the pressure diffusion? accomplished by the action spring
in surrounding relation with respect to a stationary inlet
18, the component of pulsing causing
resonance is
tube, the coil spring having a closure secured in the end 30 ?ltered out. Upon cessation of operation of the engine
thereof adapted to resiliently engage the end of the tube
driven air compressor, previously referred to, air pressure
responsive to tension of the coil spring.
within tube 14; quickly diminishes, thereby permitting coil
Yet another object is to provide a mu?ler assembly
spring 1?� to return to the position shown in FIG. 1 which
comprising a ?tting having an open ended tubular member
automatically restores plug 219? to the position effecting
secured therein, a coil spring attached to said ?tting and
sealing engagement wtih the outer end 22 of tube 14. As
surrounding said tubular member, and a resilient plug
soon as plug 29 resul -Ps sealing engagement with tube 14,
in the end of the spring normally engaging thc?open end
super-atmospheric air contained in tank 2 is prevented
of the tubular member.
trorn flowing back into the air compressor.
These and other objects, advantages and features or" the
From the foregoing it will be seen that a simpli?ed and
invention will become more fully apparent as reference is 40 improved mufller assembly has been provided. The con
had to the accompanying speci?cation and drawings
wherein:
P16. 1 is an elevational View, partly in section and with
parts broken away, illustrating a high pressure storage
tank having disposed therein a surge mut?iier assembly
incorporating the invention;
FEG. 2 is a fragmentary partially sectioned view of a
struction not only functions effectively as a surge mu?ier
but in addition automatically operates as a check valve
assembly during all periods in which the mother is dynam
ically inactive, thereby eliminating the necessity of a
check valve assembly between the muffler and source of
compressed air.
While but one embodiment of the invention has been
portion of the structure shown in FIG. 1, illustrating the
shown and described, it will be apparent that other
relationship of parts during movement of air into the
changes and modi?cations may be made therein. it is,
50
tank; and
therefore, to be understood that it is not intended to limit
FIG. 3 is a fragmentary view looking in the direction
the invention to the embodiment shown, but only by the
of arrows 3-3 of MG. 1.
scope of the claims which follow.
I claim:
1. In a high pressure storage system of the type in
sure storage tank of the type utilized in vehicle air suspen 55 cluding a source of pressure and a storage tank, a rnu?ler
sion systems. Tank 2 includes an internally threaded
assembly for said tank comprising a coil spring having a
inlet ?ange 1i which is adapted to receive an air inlet
plurality of normally axially abutting coils, an inlet ?tting
fitting 6 having an ori?ce 3 extending therethrough. It
connected to one end of said spring, a plug element dis
will be understood that ?tting 6, in turn, is connected by
posed
in the other end of said spring, an imperforate
60
suitable conduit means, not shown, to an engine driven
open-ended rigid tube disposed concentrically within said
air compressor, also not shown.
spring and having one end rigidly connected in communi
Referring now to the drawings and particularly FIG. 1,
the reference numeral 2 designates generally a high pres
In accordance with the present invention, inner end 1.9
cating relation with said inlet ?tting, the other end of
of ?tting 6 is provided with a bore 12 in which is press
said tube terminating at a distance from said ?tting suffi
?tted an elongated open ended rigid tubular member 14 65 cient to normally cause engagement with said plug
which extends into tank 2. Axially adjacent bore 12,
whereby the latter acts as a check valve preventing back
inner end
of ?tting 6 is provided with an internally
flow of air through said tube to said inlet ?tting.
threaded counterbore 16 which is adapted to threadably
2. In a high pressure storage system of the type in
receive a plurality of coils at the outer end of a tightly
cluding a source of pressure and a storage tank, a storage
wound coil spring element 18. Spring element 18 ex 70 tank rnuiiier assembly comprising a coil spring having a
tends into tank 2 in concentric relation with tube 14, a
plurality of normally ?axially abutting coils, a ?tting se
distance somewhat greater than the length of the latter.
cured to said tank having an inlet aperture formed
3,077,206
4
rtherein, means threadably connecting one end of said
spring to said ?tting, a plug element disposed in the other
end of said spring, an imper'forate open-ended rigid tube
Within said spring having one end rigidly connected to
said ?tting in? communicating relation with said inlet
said tube to said inlet ?tting, the latent tension of said
coil spring being calibrated to yield under predetermined
inlet air pressure exerted on said plug allowing the air
to enter the space between said tube and said coil spring
and emerge into the tank through the helical slit-like
aperture, the other end of said tube terminating at a dis
tance from said ?tting snr'licient to cause said plug to
normally engage said other end whereby to provide a
passage occuring upon expansion of said spring.
3. In a high pressure storage system including a source
of air pressure and a storage tank, a rnu?ier assembly
includes a rubber-like seat at the end adjacent said tube.
4. The structure set forth in claim 3 wherein said plug
includes resilient means adapted to perfect ?uid-tight
sealing engagement with said other end of said tube.
check valve preventing backflow of air through said tube
5. The structure set forth in claim 3 wherein said plug
to said inlet ?tting.
10
References Cited in the ?le of this'patent
?UNITED STATES PATENTS
comprising a coil spring having a plurality of normally
axially abutting coils, an inlet ?tting secured to said tank
and threadably engaging one end of said spring, means 15
forming an? inlet aperture in said ?tting, a plug element
disposed in the other end of said spring, an imperforate
659,456
1,572,701
2,286,841
Smith ________________ __ Oct.'9, 1900
Allec _________________ __ Feb. 9, 1926
Smith ________________ __ June 16, 1942
2,375,498
Seymour _____________ __ May 8, 1945
with said inlet aperture, the other end of said tube termi 20
nating at a distance from said ?tting sufficient to cause
2,603,188
McKay _____________ _V__ July 15, 1952
, 2,896,661
Becker _______________ __ July 28, 1959
abutting engagement with said plug whereby the latter
'
open-ended rigid tube Within said spring having one end
rigidly connected to said ?tting in communicating relation
acts as a check valve preventing back?ow of air through
FOREIGN PATENTS
20,266
Denmark _____________ __ June 21, 1915
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