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Патент USA US2122839

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Júly 5, 1938.
F. M, GUY
'
2,122,339
RESILIENT BUSHING AND MÉTHOD OF MAKING THE SAME
»
I
Filed oct.~15. 193e
gag!!
AWORNEYs.
Patented
à -.2,122,339
-UNITED STATESzazzrsss.PATENT
OFFICE - ,
`- RESILIENT' BUSHING AND METHOD 0F
MAKING»
SAME
. Frederick IH. ‘Gly’ I Detroit, Mich., assigner to'
„~ Guy and Marton, Incorporated, Detroit, Mich.,
av corporation of Michigan
Application umher-15,1936, sel-’ln No. -niacin
»s claims. (c1. ca_-149.5»I
The present-invention relates to resilient bush
ings and the method of making the same.
controlling the locking of the parte and the re
l ' silient mass to provide a sufiicient volume of
Prior to the present invention resilient bush
resilient material to 'resist yieldingly the forces
ings have been suggested in which an inner core tending to displace said core and shell.
Another object of >the invention is to provide
y is connected with an outer shell through the
medium of an intermediate layer of a resilient a resilient- bushing which is adapted to permit
material, such as rubber. In one known method yielding movement between the c’ore'and the shell
of forming such bushings the resilient member
is compressed between the core and the shell
9 either by expansion ofthe core o_r by contraction
' of the shell,l or both, with such force that a
molecular deformation of the resilient material
results and the- core and shell are held in their
relative positions by the frictional engagement
Gl of the-resilient member with the surfaces of the
core and shell. In such constructions. the con
by working of the resilient element without sub~
stantial friction losses due to slippage between
the resilient element and the core or shell.
Another object of the invention- is to provide
a novel resilient connector in which considerable
relative movements of the connected members
are permitted but only a relatively small amount ,
ofresllient material is used in the connector.
by endwise movement only by frictional engage-
A further object ofthe invention is to provide
a resilient connector wherein resilient resistance
to endwise movement of the connected parts is
ment betw'en the resilient member and the core ~
provided.
nected parts arelsecured against disengagement
_and the shell. This in turn depends upon the
compression forces imposedv upon the resilient
mass. These forces in turn affect the resiliency
of the mass so that if the core and shell are
secured against endwise displacement, the forces
eiïecting this securing oi’ the parts at the same
time impair or limit the amount of axial move
` ment between the parts.
'
In other known types of resilient bushings the
resilient material is secured as by bonding or the
like between the corel' and the shell, the rubber
` being> in a state of initial tension or in astate
in which neither tension nor compression forces
are present in the rubber. In all such known
bushings the bushing provides a greater resist
-
A still further object of the invention is to 20
provide a resilient connector made in the form
of a bushing compressed~ on a shaft or a stud, l
by a swaged shell, wherein excessive axial .
movement between the shaft and the shell is
limited `and possible endwise separation of the
connected members is prevented.
Anadded object of the invention is 'to provide
a novel resilient »connector of the foregoing
character which is durable in use. simple in
construction and economical to manufacture.
_ Other objects and advantages of this invention
will appear in the following description and ap
pended claims, reference being had to the` ac
ance to rotativev movements betweeny the core
companying drawing forming a part of _this
specification, wherein three embodiments of the
andthe shell than it does to end_wise'movements
between the core and the shell so that while such
present invention are illustrated.
In the drawing. wherein like reference char.
bushings may be used for connecting members
acters designate corresponding parts in the sev
where it is desired to resist yieldingly the rela
eralviews,
0 tive. rotative movement between the members.
' Y such members do not have al suilicient resistance
,
,
"
I
Fig. i is'a side'elevation showing a resilient 40
bushing of the present invention as utilized in
to fendwise movements to permit satisfactory
a shockabsorber connection with a part oi' a
use in certain installations, suchfor example as
chassisÁ of a motor vehicle;
Y
,
v
spring shackle connections, particularly those
Fig. 2 is alongitudinal sectional view of a re
uaed-y with transverse springs, shock -absorber con
nections, and the like 4or similar uses.
silient bushing of the present invention, the Vsec'
`tion being taken substantially on the line 2--2 of
One of theïobjects of the present invention,
v therefore, is to’provide a resilient bushing which -
is adapted to permit relative movement of the'
connected members radially and axially through
25
Fig. l;
Flgf`3 illustrates a step in assembling
novel y
connector;
'
_ Fig. 4 illustrates the step vsucceeding the> step
a body of compressed resilient. material, >>while'l shown in Fig. 3 in assembling the connector; '
Fig.y 5 illustrates a iinal 'step -in lassembling the
locking the connected` members against dis
-placement dueto endwise- movements thereof.'y connector in accordance with the invention;
Another object of the invention is'to provide '
5 a resilient bushing of the type in which a core
_anda 'shell are resiliently- connected through a
compressedl and deformed mass of resilient, ma
Fig.-6 is a longitudinal sectional view of av
modified structure embodying the present inven
tion;
and
g
-
.
A
.
y
55
’
Fig. 7 is aylongitudlnal'sectional view of an
‘ terlal locked between'the'core and the shell in a „ other modincation of the invention.
manner permitting axial movements of the' core
Before explaining in detail the pres-ent inven
i and shell and 'in which provision is made .for tion itis to be‘understood that- the invention is
60
'
2
2,122,839
not lmited in‘its application to the details of con
struction and arrangement of parts illustrated in
the accompanying drawing, since the invention is
capable of other embodiments and of being prac
a smooth shell as is the case in prior structures,
the connection thus effected does not afford
suiiicient resistance to end thrust between the
connected parts. This is due to a variety of fac
ticed or carried out in various ways. Also it is ' tors, and particularly to thefact that the rubber
ñbers have different stresses indiîîerent direc
to be understood that the phraseology or termi
tions, and the further fact that the rounded bulg
nology employed herein is for the purpose of de
ing ends of the rubber in the bushing causes the
scription and not of limitation, and it is not in
- tended to limit the invention claimed herein be- ` bushing to roll on the shaft longitudinally, this
rolling being restricted only by decreased resilient
yond the requirements of the prior art.
In the drawing there is illustrated, ,by Way of resistance of the bushing. In some speciñc in
example, a novel resilient connector constructed stances, particularly with short thick bushings,
the bushing assumes the shape of a ring of sub
in accordance with one embodiment'of the in
~vention, said connector being here shown and tantially oval cross section and the stud can roll
out onl such rubber bushing when subjected to
15 described as a part of a conventional shock ab
sorber connection operatively mounted on the high end thrust loads. Making the bushing thin
and long ‘operates to destroy the amount of re
chassis of a motor vehicle. It is to be under
stood, however, that I do not desire to be limited siliency ordinarily required. By providing the
to the above speciiic employment of my novel locking means exemplified in the present em
connector, since with proper changes in design bodiment by the bead and groove, I increase the 20
the same may be advantageously used in many longitudinal resistance ofv the bushing by induc
ing compression and shearing stresses in the~ rub
1 other structures, such for example as in steering
rod knuckle, joints, spring shackles, and the like. ber mass of the bushing when the connector is'
_
Referring to Fig. 1 the structure illustrated subjected to an end thrust.
Figs. 3, 4 and 5 illustrate the method of assem 25
p therein comprises a shock'absorber of the tele
scopic type, having an upper snubber Ill and a bling the connector shown in Fig. 2. An initial
step in the method employed comprises arrang
lower snubber I |,telescopically arranged with re
spect to each other. On the ends of each of said ing a comparatively- narrow and thick rubber
snubbers there are provided eyelets I2 and I3 ring 20a on the stud I4. The Vouter shell is next
adapted to receive the studs lI4 and I5 carried by - placed around the rubber ring 20d and is swaged
a bracket I6 secured to the vehicle frame I1 and or reduced thereon in any suitable manner, such
to the axle I8 supported by a leaf spring I9 as with the aid of a rotary swa‘ging machine. In
shackled at its ends to said frame I1. Between the course of this operation the rubber ring 20a
the eyelets I2 and I3 and their respective studs assumes the positionillustrated in Fig. 4. The
i4 and I5 there are provided rubber bushings 2|) last operations consistin forming the_rolled bead
30 on the shell 20, preferably with the aid of a
and 2|> respectively, mounted therein in a man
rolling machine indicated diagrammatically by
ner hereinafter described in detail. 'I'he con
struction of the resilient connectors at the upper the rollers 50 and 5| (Fig. 5). One of the advan
telescopic member III and the lower telescopic
40 member || is similar, and only one of said con
nectors is herein described in detail.
Referring to Fig. 2, the structure illustrated
tages of the structure shown in Fig. 2 and of the
method described above results from the fact 40
that the above operations- can be performed land
the connector assembledbefore mounting of the
shock absorber or other part on the chassis. If
therein comprises the stud. I4 having a cylin
desired, the completed connector assembly can
drlcal portion 22, a shoulder 23, a knurled por
tion 24, and a» threaded shank 25. Said stud I4 ' bepressed into an eye of theshock absorber and
is pressed into a hole 26 provided in the bracket peened thereon or otherwise secured thereto be
I6, engaging the same by its knurled portion 24, fore connecting the shock absorber on the
whereby rotation of the stud with respect to said
50
(II)
chassis.
,
A nut 21 and a lock
Fig. 6 illustrates a modified form of a con
washer 28 ar'e provi-ded a't the threaded shank 25
which. when' tightened up, secure the stud |4 to
the bracket I6 by drawing the shoulder 23 against
nector utilizing a bushing of the present inven
tion, wherein- the stud 33 is formed with a hol
said bracket I6. The eyelet. I2 of the upper tele
thereon. In this instance a groove 35 is provided
on the outer shell 36. In assembling this struc
bracketY |6 is prevented.
scopic member I0 is bored to receive a cylindri
cal shell 29 surrounding the. rubber bushing 20.
Said shell 29 is provided with a circular V-shaped
rolled bead 30 projecting toward the axis of the
stud I4. 'I'he stud I4 is, in turn, provided with
a groove 3| concentric with respect to said bead
30 and lying substantially in the same plane
therewith.
.
i
low body portion having a`raised bead 34 provided
ture, a thick narrow rubber ring similar to the
ring 20a is placed on the stud 33 and the outer
shell' 36 having a preformed groove 35 is swaged
thereon. An expansion member is next placed
on the inside of the stud 33 and the stud is ex
panded so as to form the bead 34. 'I'his forces
the rubber bushing into the space between the ~
ber bushing 20, whereby the rubber of the bush
ing is put in compression in a radial direction,
lbead 34 and the groove 35 and formsv a resilient
lock between the shell 36 and the stud 33. If
desired, the shell 36 may be dispensed with. and
' which it is believed results in shortening of the
vthe groove 35 may be formed on a formed bored
radial fibers and an axial stretching of the bush
surface of the part to whichzthe bushing is to be
attached. With this arrangement the stud 33 is
>The shell 29 is swaged or reduced on the rub
i118, so that the> rubber- completely iills the
expanded outwardly in addition to forming the -
-By virtue _of the above construction I am able
to retain allj the benefits of the radially com~
pressed bushings and eliminate the disadvantages
which have heretofore been consideredA as in
herent in such bushings.~ If no means for lock
ing the rubber is provided and the rubber bush
'75 Y ing is swaged on a smooth cylindrical surface by
bead 34, thus compressing the rubber between
»the >stud and the part to which the bushing is to 70
be attached. Thus, in this type of construction
the connector and the shock absorber may be
. locked together as an assembly before they are
attached to the vehicle.v
-
In the modified structure s own in Fig.(7, the 75
3
areassc
yielding movement being permitted by fiexure or
I stud is composed of two sections,- namely, a ta
pered ‘core 31 and a sleeve 38 adapted to fit on working occurring. within the resilient mass pro
the smaller end of said core 31 and to be locked viding the yielding connection between the core
and the shell. The foregoing, as well as other.
thereon in any suitable manner, such as by peen
ing. Assembled together as described, the core , uses to which the bushing may be'adapted, l are Ato
31 and the sleeve 38 form a stud with a groove be considered as included within the scope of
‘ the appended claims.
39 provided on its cylindrical portion. The rub
ber bushing 40 is arranged on the smaller end of
the core 31 before putting the sleeve 38 in place,
and the outer shell 4| having‘a bead I2 is forced
‘.
I claim:
>
1. In a method of making a resilient connector
having a stud composed of a core and a sleeve 10
over the rubber by axial movement thereon. The ' fitted thereon, said core and said sleeve adapted,
resulting positions of the shell and the bushing
are indicated in` Fig. '7 in dotted lines. 'I'he angle
of taper of the shell li indicated by the letter A,
15 may vary, 15° being a preferredangle for the
structure illustrated, The sleeve 38 is `next put in
place and locked on the core 31, as mentioned.
Finally, the shell 39 is swaged or reduced to the
shape shown in Fig. 7 in solid lines. Thus a com
20 pleted assembly is produced which can be pressed
into the -respective eyelet of the shock absorber,
or other device in which the bushing is to be uti
lized. This structure as far as locking of the core
and shell with the resilient member is concerned,
possesses advantages similar -to those described
for the preferred structure.
.
_
While vulcanized rubber is at\the present time
when fitted together, to form a stud containing
a groove therein, an outer shell, and a resilient
member arranged between such stud and said
shell; the steps of arranging the resilient mem 15
ber on the core, placing the tapered outer shell.
thereon, fitting said Sleeve at the thinner end of
said core and locking it thereon by swaging the
outer end of the sleeve into a locking recess near
the outer extremity of the thinner portion of 20
said core, and thereafter swaging- the outer shell
on said -resilient member into a shape substantial
ly‘parallel to the longitudinal axis of said stud
and thereby locking the resilient member be
tweenfsaid studand said shell.
.
’
2. A resilient coupling comprising a two-piece'
stud, said stud consisting of a core having shank
the preferred material from which to form the and shoulder portions near one end thereof and
sharply tapering into an extending portion of
resilient element of this bushing, it is to be under
30 stood that various types of such material may be ï decreased but substantially uniform diameter on
used, `as well as substitutes therefor, and; I do the opposite end therefrom, and a sleeve` ñtted
substantially completely over the said extending
. not desire to be limited to the use of any particu
portion and compressed into a groove provided
lar type of resilient materials.
Thus> considered from one of its broader as-V on the end of said portion, said sleeve being of
35 pects, my invention contemplates providing a substantially, the same diameter as the said core 35
novel resilient connector including a radially and having an end portion sharply tapering in an
compressed resilient bushing, said bushing being opposite direction from the taper of the core,
provided with locking means‘adapted to provide .whereby the stud is created, said stud being of
substantially uniform diameter but containing an
a cushioned locking connection to preventend
annular concentric groove between the said ta 40
40 wise displacement of the ~connected parts and an
increased resiliency of the bushing to axial thrust pering portions of the core and sleeve parts there
of ; a concentric shell arranged around said stud,
- loads. The bushing of the present invention like
a raised bead on the inside surface of said shell,
wise permits yielding resilient movements be
tween the parts when subjected to forces tending arranged to correspond with' the groove formed
45
to cause endwise movement thereof.
I
A resilient bushing of the present invention
may be utilized in a number of mechanical de
vices which, by way of example but not of limi
tation, may include in addition to the foregoing
on said stud and a rubber bushing radially com
45
pressed between said stud and said shell and
locked in position between said bead and groove.
3. A resilient coupling comprising a two-piece
stud, said stud consisting of a core having shank>
uses, the following: Universal joints employing and shoulder portions near4 one end thereof
resilient connections between a carrier member
and a driving and drivenshaft, flexible couplings
, in which the drive is transmitted from the driv
ing shaft to the driven shaft through an inter
55 posed resilient bushing, linkage connections ' of
various _kinds as used in link belts, pivoting arms,
and sharply tapering into an extending por
tion of decreased but substantially uniform diam
eter on the oppositebend therefrom, said ex
tending portion having a tapering recess nearthe end thereof, and a sleeve ñtted substantially
completely over the said extending portion and
« and the like, clutches employing resilient clutch . locked into the said recess, said sleeve being of
centers, resilient connections between linkage substsantially the same diameter as the core and
’ members employed on braking systems in motor ' having ar. end portion sharply tapering in an op
vehicles, and the like or simiiaruses.
It is understood that in forming the bushing of
the present invention, the resilient element must
be forced into place between _thecore and the
shell under pressures exceeding the elastic limit
of the resilient mass so that mass will take a per
mènent formor shape in the structure. '
posite direction from the taper of the core, where
by the stud is created, said stud-being of sub
stantially uniform diameter but containing an
annular concentric groove between the said ta
pering portions` of the core and sleeve parts
thereof; a concentric shell arranged around said 65
stud, a raised bead .on the inside surface of said
In allo! the foregoing named examples, as well fshell, arranged to correspond with the groove
as in others that will occur to vthose skilled in formed on said stud and a rubber bushing radial
the-tart, the resilient bushing provides for a ly compressed between said stud and said shell
yielding
connection between two connected parts, ' and locked in position between said Abead and 70
70
andthe me.
one partv being connected to the
FRmERICK M. GUY.
yotherpartbeingconnectediau»thecos'asndtlm
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