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Патент USA US3077100

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Feb. 12, 1963
F. L. HAUSHALTER
3,077,090‘
COMPOSITE ASSEMBLY FOR usE BETWEEN CONCENTRIC
SECTIONS OF A TORSIONAL SHAFT
Original Filed Aug. 18, 1960
INVENTOR.
FRED L. HAU SH ALTER
Lydian“ AAM“
ATTO R N EYS‘
United States Patent O?ice
l
2
3 i977 6%
al shaft having the insert of FIGURES 1 and 2 disposed
in the space between the shaft sections.
corvrrosrrn Asses/mils’ r’on use nnrwnnn €GN~
("JEN
3,6716%
Patented Feb. 12, 1963.
SE‘CHGNS GF A TGRSKONAL SHAFT
FIGURE 4 is a view similar to FIGURE 3 but shows
the parts in an intermediate stage of assembly.
FIGURE 5 is a fragmentary plan view of a modi?ed
Pontiac, Mich.
insert.
Original appiication Aug. 18, 196i}, Ser. No. 56,448.
Divided and this application May 25, 1952, Ser. No.
FIGURE 6 is a fragmentary sectional view, taken on
197,750
the line 6——6 of FIGURE 3, of a torsional shaft hav
12 Claims. (Cl. 6¢%--27)
ing a slab type insert.
10
FIGURE 7 is similar to FIGURE 6 but shows the inner
This invention relates generally to a composite as
and outer sections of the torsional shaft relatively rotated.
Fred L. Haushalter, 2185 Scott Lake Road,
sembly for use between concentric sections of a torsional
shaft, and refers more particularly to a composite assem
In FIGURES l and 2 it will be seen that the com
posite assembly or insert it} initially comprises a flat rec
bly disposed within the annular space between the op
tangular metal sheet 11, preferably steel, to one side of
posed concentric cylindrical surfaces of the spaced 15 which are bonded a plurality of spaced, parallel shaped
apart relatively rotatable, inner and outer members or
resilient elements or strips 12 formed from rubber or
sections of a torsional shaft.
other curable elastomer. These elements: are securely
This application constitutes a division of my applica
bonded to the metal sheet by curing the elements to the
tion Serial No. 50,448, filed August 18, 1960.
sheet. By bonding the rubber to a thin flat steel sheet,
One of the essential objects of the invention is to pro 20 the pressure of vulcanization is at right angles to the plane
vide a composite assembly for use between the relative~
of the metal, or directly down on the metal, so that a
ly rotatable members of a torsional shaft wherein the
good bond is obtained. A relatively thin coating 13 of
composite assembly is preformed before being assembled
elastic material such as rubber is bonded to the opposite
with the members.
surface of the sheet ll. The coating 13 may be sprayed
Another object is to provide a composite assembly so 25 on, or it may be a sheet of rubber bonded to the metal by
formed that it may be quickly and easily assembled with
curing directly thereto. The coating covers the entire
the relatively rotatable members.
surface of the metal sheet so that its edges are flush with
Another object is to provide a composite assembly
the edges of the sheet.
which includes a metal sheet or strip having a plurality
In FIGURE 5, an insert 14 is shown which differs from
of slabs or one or more strips of elastic material bonded 30 insert 10 only in that instead of the spaced parallel strips
to one surface thereof and a relatively thin coating of
of rubber, spaced parallel rows of spaced individual slabs
elastic material bonded to the opposite surface thereof.
15 are bonded to the ?at metal sheet. The opposite
Another object is to provide a composite assembly
surface is provided with a coating like the coating 13 for
which serves as the sole means for effecting a yieldable
insert it).
connection between the relatively rotatable inner and 35
With respect to both inserts l0 and 14, there will be
outer members.
a thin ?lm of rubber over the metal between the elements
12 or 15. However, this is incidental and is the result
Another object is to provide a composite assembly
wherein the slabs or strips are relatively thick and capa
of flow from the elements during curing.
ble of substantial radial compression, and wherein the
After the rubber strips or slabs and coating have been
40
coating of elastic material substantially completely covers
bonded to the ?at metal sheet, the combined rubber and
the surface of the sheet or strip to which it is bonded.
metal insert is bent to circular form with the rubber ele
Another object is to provide a composite assembly
ments on the inside of the circle, and inserted into the‘
wherein the slabs are spaced apart circumferentially in
outer member or tube 16 against shoulder 17. With
a row and have a substantially constant torsion rate
respect to insert it), the strips will extend circumferential:
4
throughout a speci?ed angle so that relative rotation of
ly in axially spaced relation to each other, and with re
the members is substantially proportional to the torque
spect to insert 14, the rows of slabs will extend circum
applied, and wherein the slabs are so spaced as to close
ferentially and in axially spaced relation to each other,
up when the speci?ed angle is exceeded to substantially
and the slabs in each row will be spaced circumferentially
increase the torsion rate.
from each other. The insert it} is shown in FIGURES 3
Another object is to provide a composite assembly 50 and 4, although the insert 14% will have the same appear
having a plurality of axially spaced, circumferentially
ance in longitudinal section and is inserted in the same
extending rows of circumferentially spaced individual
way. The inner member or tube 19 is then inserted axial
slabs of elastic material bonded permanently in surface
ly Within the outer tube and insert in the direction of the
to-surface relation to one surface of the metal sheet or 55 arrow 19’ to the ?nal assembled position of FIGURE 3.
strip.
In the ?nal assembled position, the outer cylindrical sur—
Another object is to provide a composite assembly hav~
face 20 of the inner tube and the inner surface 18 of the
ing a plurality of axially spaced circumfercntially extend
outer tube are concentric and de?ne an annular space
which is of less radial width than the combined cross
ing continuous strips of elastic material bonded perma
nently in surface-to~surface relation to one surface of the 60 sectional thickness of the rubber elements, metal sheet
and coating making up the insert in or 14. Accordingly,
metal sheet or strip.
the wall of the rubber elements 12 or 15 will be com
Other objects and features of the invention will become
pressed about 40% to 50% of their original height of
section when the assembly is completed, and the rubber
elements will frictionally encage the cylindrical outer sur
face 20 of the inner tube 19. The rubber coating 13
frictionally engages the cylindrical inner surface 18 of
apparent as the description proceeds, especially when
taken in conjunction with the accompanying drawings,
wherein:
FIGURE 1 is a fragmentary plan view of the initial
form of a composite assembly or insert, before assembly
the outer tube and may, as stated, be very thin since the
with the sections or members of a torsional shaft.
FEGURE 2 is an edge view of the inert shown in FIG
URE 1.
FIGURE 3 is a longitudinal sectional view of a torsion
primary purpose is to prevent slip.
70
The inner tube may have an annular bevel 21 at one
end to facilitate insertion, or as an alternative, a tapered‘
pilot 22 may be employed for this purpose. The pilot 22
aor'aoso
3
has a reduced end 23 adapted to enter the inner tube
which de?nes a shoulder 24' engageable with the tube end.
5
The pilot is removed after assembly. FIGURE 4 shows
the rubber elements in solid lines before insertion of the
inner tube, and in dotted lines after insertion thereof.’
Since the radial width of‘ the space between the tubes
is less than the thickness of the insert, the rubber ele
ments 12 or 15, which are initially placed in. radial com
pression when the insert is bent to circular form, will be.
stretched a substantial amount and placed under tension 16
as the inner tube is inserted. At the same time the rub
ber‘ elements" tend to assume their original form and there
fore they will be further compressed‘. The tendency of
the rubber" elements to assume their original form effects
an intimate frictional engagement between the rubber
elements 12 or 15 and the inner tube, and between the
coating’ 13 and the outer tube.
A
surface of the other of said rotatable members, the radial
width of‘ the annular space aforesaid being less than the
initial combined overall cross-sectional thickness of said
sheet and the material bonded to opposite surfaces thereof
C21 in the free state of said material, whereby said entire insert
is under compression between said cylindrical surfaces.
2. The combination with spaced apart inner and outer
relatively rotatable members provided with opposed cylin
drical surfaces concentric with the axis of rotation of said
members and providing an annular space therebetween, of
a yieldable connection between said rotatable members
disposed within said annular space and comprising a sepa
rate preformed composite insert including a relatively
thin, substantially annular metal sheet within said'annular
spacebetween and concentric with said cylindrical surfaces,
a circumferentially extending row of circumferentially
spaced individual slabs of elastic material bonded perma
nently in surface-to-surface relation to one of the radially
The tubes 16 and 19 are concentric sections of a tor
facing surfaces of said sheet and disposed in surface-to-sur
sional shaft, such as the propeller shaft of a- motor vehicle.
When the insert 10 having continuous rubber strips is 20 face frictional engagement with the cylindrical surface of
employed, the torsional rate in inch-pounds per degree is
one of said rotatable members, and friction material bond
ed permanently in surface-to-surface relation to the other
substantially constant; that is, the relative rotation be
of the radially facing surfaces of said sheet and disposed in
tween the'members 16 and 19 is nearly proportional to
the torque, so that a plot of angle against torque would
surface-to-surface frictional engagement with the cylindri
produce substantially a straight line. However, if the
cal surface of the other of said rotatable members, said
insert‘ 14‘ having rowsv of spaced slabs is used and‘ the slabs
slabs being relatively thick and ‘capable of substantial radial
are properly spaced‘ circumferentially, when the members
compression and said friction material being relatively thin.
16: andf.19'~are rotated‘ relatively the torsional rate will be
in comparison-with said slabs, the radial width of the
fairly» constant‘ through a speci?ed angle and then the
annular space aforesaid being less than the initial com
rubber will stiffen up and the torsion rate will increase 30 bined overall cross-sectional thickness of said sheet and
substantially» as the gap-between the slabs closes.
the material bonded to opposite surfaces thereof in the free
Referring to FIGURE 6, the inner and outer members
state of said material, whereby said entire insert is under
are~>shown=withrno torque applied, and‘ the insert is of the
compression between said cylindrical surfaces.
type in which the rubber elements are in the form of
3. The combination de?ned in claim 2, wherein said
spaced‘; slabs. With no torque applied, the slabs barely
friction material is a. layer of elastic which substantially
touch; When theinner and outer‘ members are rela
completely covers the surface of‘ said sheet to which it
tively-rotated; thetorsion rateis‘ initially constant so that
is bonded.
torque is proportional to the angle, but when a speci?ed
4. The combination de?ned in claim 3, wherein said.
angle “a”"is reached, the gap between-the slabs closes,‘ as
slabs are bonded to the radially inner surface. of said sheet
in~FIGURE'7; and the torsional rate thereafter increases to. and disposed in frictional engagement with the cylindrical
markedly.‘ due tothe fact that the rubber stiffens and acts
surface of said inner member and said friction material
much like a continuous strip.
is bonded to the radially outer surface of said sheet and.
While the bonding’ of the rubber elements to the metal
is disposed in frictionalvengagement with the cylindrical
strip has beenrdescribed as being effected by curing‘ the
surface of said outer member.
rubber tobthemetal, the rubber may be adhered to the 45
5. The combination with spaced apart inner and outer
metal by other suitable methods such as‘ by- adhesives.
relatively rotatable members provided with opposed'cylin
The preferred initial‘ step is one in which the rubber ele
drical surfaces concentric with the axis of rotation of
ments‘: are bonded to a ?at metal strip‘which is sub
said. members and providing an annular space therebe~
sequently‘bentto, circular form, but- it is within-the con
tween, of a yieldable connection between said rotatable
cept of. the invention-to. bond the rubber to a‘ preferred 50 members disposed. within said annular space and com
continuousmetalband'. Other modi?cations within the
prising a separate preformed composite insert including a
terms. of theclaims are also contemplated. It will also
relatively thin substantially annular metal sheet within
be understood: that i'n'eachtof the modi?cations described,
said annular space between and concentric with said cylin
therubber. elements‘ may be lubricated to facilitate the
drical surfaces, at circumferentially extending row of cir
55 cumferentially spaced individual slabs of elastic material
entry. of.‘ the, inner member during assembly.
What ‘I‘ claim‘ias my invention is:
bonded permanently in surfacerto-surface relation to one
1‘. The combination with spaced apart inner and outer
of the radially facing surfaces of said sheet and disposed
relatively rotatable members provided with opposed cylin
in surface~to-surface frictional engagement with the cylin
drical surfaces concentric with the axis of rotation of
drical surface of one of said rotatable members, and file
said members and" providing an annular space therebe 60 tion material bonded permanently in surface-to-surface
tween, of a yieldable connectionbetween said rotatable
relation to the other of the radially facing surfaces of said.
members disposed within said- annular space and compris
sheet and disposed in surface-to-surface frictional'engage
ing aseparate preformed composite insert including a rela
ment with the cylindrical surface of the other of said
tively thin, substantially annular metal sheet within said
members, the radial width of‘ the annular space
annular space between and concentric with said cylindrical 65 rotatable
aforesaid being less than the initial combined overall cross
surfaces, a circumferentially extending row of circumfer
sectional thickness of said sheet and the material bonded
entially spaced individual slabs of elastic material bonded
to opposite surfaces thereof in the free state of said mate
permanently in surface-to-surface relation to one of the
rial, whereby said entire insert is under compression be
radially facing- surfaces of said sheet and disposed in sur
face-to-surfacei frictionalengagement with the cylindrical 70 tween said cylindrical surfaces, said slabs having a sub
stantially constant torsion rate throughout a speci?ed angle
surfaceof oneiof said rotatable members, and friction ma
so that relative rotation of said members is substantially
terial bonded permanently in surface-to-surface relation
tojand'substantially completely covering the other of the
radially-facingjsurfaces; of said sheet and disposed in sur
proportional to the torque applied, said slabs being‘so
spaced as to close up when said speci?ed angle is exceeded
f'clQ?rtQ-Slll'f??? frictional; engagement‘ with the cylindrical 75 to substantially increase the torsion rate.
3,077,090
6. A torsional shaft comprising spaced apart inner and
outer relatively rotatable members provided with
opposed cylindrical surfaces concentric with the axis of
rotation of said members and providing an annular space
therebetween, a yieldable connection between said rotat
able members disposed within said annular space and
comprising a separate preformed composite insert includ
ing a relatively thin substantially annular metal sheet
within said annular space between and concentric with
said cylindrical surfaces, a plurality of axially spaced
circumferentially extending rows of circumferentially
6
and outer relatively rotatable members provided with op
posed cylindrical surfaces concentric with the axis of
rotation of said members and providing an annular space
therebetween, a yieldable connection between said rotat
able members disposed within said annular space and
comprising a separate preformed composite insert in—
cluding a relatively thin, substantially annular metal
sheet Within said annular space between and concentric
with said cylindrical surfaces, a plurality of axially
spaced rows of circumferentially extending continuous
strips of elastic material bonded permanently in surface
spaced individual slabs of elastic material bonded per
to-surface relation to one of the radially facing surfaces
manently in surface-to-surface relation to one of the
of said sheet and disposed in surface~to-surface fric
radially facing surfaces of said sheet and disposed in sur
tional engagement with the cylindrical surface of one of
face-to-surface frictional engagement with the cylindrical 15 said rotatable members, and friction material bonded
surface of one of said rotatable members, and friction
permanently in surface-to-surface relation to the other
material bonded permanently in surface-to-surface rela
of the radially facing surfaces of said sheet and disposed
tion to the other of the radially facing surfaces of said
in surface-to-surface frictional engagement with the cylin
sheet and disposed in surface-to-surface frictional en
drical surface of the other of said rotatable members,
gagement with the cylindrical surface of the other of
the radial Width of the annular space aforesaid being
said rotatable members, the radial width of the annular
less than the initial combined overall cross-sectional
space aforesaid being less than the initial combined
thickness of said sheet and the material bonded to oppo
overall cross-sectional thickness of said sheet and the
site surfaces thereof in the free state of said material,
material bonded to opposite surfaces thereof in the free
whereby said entire insert is under compression between
state of said material, whereby said entire insert is under 25 said cylindrical surfaces.
compression between said cylindrical surfaces.
11. The torsional shaft de?ned in claim 10, wherein
7. The torsional shaft de?ned in claim 6, wherein said
said strips are relatively thick and capable of substan
slabs are relatively thick and capable of substantial radial
tial radial compression and said friction material is a
compression and said friction material is a layer of elastic,
layer of elastic, relatively thin in comparison with said
relatively thin in comparison with said slabs, and sub 30 strips, and substantially completely covers the surface of
stantially completely covering the surface of said sheet
said sheet to which it is bonded.
to which it is bonded.
12. The torsional shaft de?ned in claim 11, wherein
8. The torsional shaft de?ned in claim 7, wherein said
said strips are bonded to the radially inner surface of
slabs have a substantially constant torsion rate through
said sheet and disposed in frictional engagement with
out a speci?ed angle so that relative rotation of said 35 the cylindrical surface of said inner member and said
members is substantially proportional to the torque ap
layer of elastic is bonded to the radially outer surface
plied, and wherein said slabs are so spaced as to close
of said sheet and disposed in frictional engagement with
up when said speci?ed angle is exceeded to substantially
the cylindrical surface of said outer member.
increase the torsion rate.
9. The combination de?ned in claim 7, wherein said 40
References Cited in the ?le of this patent
slabs are bonded to the radially inner surface of said
UNITED STATES PATENTS
sheet and disposed in frictional engagement with the
cylindrical surface of said inner member and said fric
2,044,392
Lord _______________ __ June 16, 1936
tion material is bonded to the radially outer surface of
2,468,985
Krotz _______________ _._ May 3, 1949
said sheet and is disposed in frictional engagement with 45
the cylindrical surface of said outer member.
FOREIGN PATENTS
10. A torsional shaft comprising spaced apart inner
518,096
Great Britain ________ __ Feb. 16, 1940
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