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Jan; 7, 1941.
R, A, CARLSON
.
2,413,810 '
FRICTION CLUTCH
Orìgingl Filed Feb. 14, 1941
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Jan. 7, 1947.
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R. A, CARLSON
2,413,810
FRICTION CLUTQH
Original Filed Feb. 14, 1941 l
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l2,413,810
Patented Jan. 7, 1947
UNITED sTATas PATENT oFFics "
FBICTION CLUTCH
`Raymond A. Carlson, Rockford, lll., asslgnor to
Borg-Warner Corporation, Chicago, Ill., a cor
poration of Illinois ~.
Original application February 14, 1941, Serial No. .
378,848. Divided and this application October
9,1943, serial No. 505,604>
6 Claims.
1
2
This invention relates to friction clutches and
particularly to an improved arrangement of driv--
ing and engaging means for the friction facing
assembly.
(cl. 19a-6s)
`
«
_
'
.This is a division of my United States applica
tion, Serial No. 378,848. ñled February 14, 1941,
which issued as Patent No. 2,334,382.
It is an object of the invention to provide, in
,
rial. >Interposed between the segments I4 are a
plurality of 4loose segments I1 of substantially
the same thickness as the segments I4 so as to
cooperate with the segments I4 in maintaining
the facings I6 in parallel planes while taking the
_ pressure of clutch engagement. The segments
I1 are confined between the facings I6, the seg
ments I4, and the drive ring IÍI.
The segments I4 and I1 are provided with
_ a friction clutch _of the typevwherein the facing
carrying means is in the form of an annulus 10 peripheral teeth 9 and 9a respectively meshing
with the internal teeth I2roi the drive ring I0.
having driving connection with an encircling
The teeth on the loose segments I 1 are adapted
drive transmitting member and having peripheral
to snugly engage the teeth I2 under the effect
teeth meshing with internal teeth on _said drive
of centrifugal force, so as to take up the back
transmitting member, means- for minimizing
lash between the facings and the drive ring I0,
backlash between saidteeth.,- To this end, the
as will later be pointed out. »
invention contemplates the formation of the fac
The facings I6 are adapted to be engaged be
ing supporting annulus in the form of a plurality
tween a pair of driven elements I9 and 20, the
of circumferentially separated segments to which
element I9 having a hub portion 2| which is.
the facings are secured, and the provision of ad
ditional segments which are loosely received in 20 splined upon a driven shaft 22 and the element
the spaces defined between said facings and the
20 having internal teeth 23 meshing with splines
ends of the other segments and are provided with
24 on the hu-b' portion 2l so as to be drivingly
connected thereto while capable of axial shifting
peripheral teeth adapted to snugly engage the
movement to permit clutch engagement.
teeth of the drive transmitting member under
the effect of centrifugal force.. Thus the loose 25 Mounted on the shaft 22 for axial shifting
additional segments, when gripped between the
movement is a sleeve 25 which is connected
friction facings prevent independent movement
through the medium of an end thrust bearing 26
of the facing supporting segments which would
create backlash between said latter segments and
with a collar 21 having trunnions 28 adapted to
coact with a shifting fork of conventional design.
30 Secured upon thesleeve 25 is an operating cam
the drive transmitting member.
ring 29 having a frusto-conical cam surface 30
Other objects, the advantages and uses of the
terminating in a reentrant locking groove 3i.
invention will become more apparent after read
Linkage for transmitting clutch operating
ing the following specification and claims, and
after consideration of the drawings forming a
movement from the cam 29 to the driven clutch
part of the specification, wherein:
ing elements I9 and 20, includes a pluralityof
Fig. l is an axialv sectional view of a clutch
embodying my invention, the clutch being shown
levers 32 each fulcrumed on a pivot pin 33 mount
ed between a pair of ears 340i a fulcrum mem
ber 35 which is flxedly associated with the driven
element I9 and‘shaft 22 as for example, by means
40 of thel machine screws 1 securing it to the driven
clutch disengaged; and’
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element I9. The levers 32 are in the form of bell
Fig. 3 is a transverse sectional view of the
cranks, each including an arm 36 extending in
clutch, taken on the line 3--3 of Fig. 1.
a generally axial direction and an ann 31 ex
As an example oi’ one form in which the in»
vention may be embodied, I have shown in the r tending radially inwardly. The arm 3S is formed A
at its end with a fork 38 in which is journalleda
- drawings a clutch of the heavy duty industrial
roller 39 adapted to coact with thecam face 30.
type, including a drive transmitting member Il)
The transmitting linkage further includes ,
having openings II by means of which it may be
manual adjustment mean-s, indicated generally at
attached to a driving member such as for ex
8, and resilient transmission links, indicated gen
` ample, a ñywheel, and having internal teeth I2
erally at I8, both interposed in series with each
for transmitting drive to a driving clutch element
other between the levers 32 and the driven ele
indicated generally at I3. The driving element
I3 includes a plurality of circumferentially sepa- ~ ment 20.
The adjustment means 8 comprises an adjust
rated facing supporting segments I4l to which
ing cam ring 44 rand a plurality of levers 40, the
are secured »as by means of rivets I5, a pair of
embracing facings I6 of suitable frictional mate 55 ring 44 being carried by the driven element 28
in engaged relation;
_
Fig. 2 is an axial sectional view showing 'the
2,413,810
and the levers 40 being operatively interposed
between the ring 44 and the resilient link I8.
The levers 40 are embraced between the ears 34
of the fulcrum member and are fulcrumed on
pivot pins 4I mounted inthe ears 34 outwardly
of the levers 32. The inner arms of the leversv
4
load. When the clutch begins to rotate, the
loose additional segments I1 are centrifugally
moved outward so that their teeth 9a fit snugly
into internal teeth I2 on the drive transmitting
ring I0. When pressure members I9 and 20 have
moved into frictional engagement with the fac
ings I6 as above described, the >clutch is fully
40 are bifurcated to provide spaced furcations 53
-coupled and the fixed as well as the loose seg
which embrace the levers 32. The outer arms 42
ments I4 and I1 are firmly held between the fac
of the levers 40 are engaged against cam surfaces
43 on the adjusting ring 44. The ring 44 has a 10 ings. Due to the snug flt of teeth 9a with ring
teeth I2 there can be no relative rotative move
flange 45 which is secured against the rear face '
ment between' any of the clamped parts, includ
of the driven element 20 by means of screws 48.
ing the ring teeth I2 and the fixed segment teeth
The screws 48 extend through openings 41 in the
9, and consequently backlash between these latter
flange 45 and may be removed to permit the ring
'
44 to be rotated with reference to the driven 15 meshed teeth is impossible.
The cam surface 30 of the operating member
element 2li and reinserted through different
provides for considerably more movement of the
openings 41.'
levers 32 than is necessary for advancing the
The resilient links I8 are mounted in axially
extending cylindrical bores 48 in the hub portion4 ~ driven elements into engagement with the drive
2| of the driven element I9. Each link I8 in 20 element. The surplus movement is'absorbed in
cludes a coil spring 49, a draw bolt 50 and a
the compression of the spring 49. This surplus
movement is utilized to take up slack -in the link
age that would otherwise be occasioned by wear
the washer 5I and a head 52 on one end of the
ing down of the facings. Thus the yielding trans- .
draw» bolt 50. The head 52 and washer 5I are
fitted loosely in the bore 48 so as to be axially 25 mission links vI8 provide for automatic adjust
ment for facing wear within a limited range.“
slidable therein.
_
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When this range of adjustment has been> ex
The resilient links are each operatively inter
hausted, it may be extended by manually ,adjust
posed between an arm 31 of a lever 32 and the
ing the cam ring 44. Within the new range of
furcations 53 of the corresponding lever 40. y The
arm 31 has at its end a fork embracing the‘ bolt 30 adjustment thus provided, the linkageI will con
tinue to provide automatic adjustment for fur
50, received in notches 54 formed in the‘sides of
ther facing wear.
'
'
the bolt, and acting against a head 55 deñning
The invention provides an arrangement which
one extremity of thel respective notches 54. The
is very `compact. 'I'he resilient transmission ele
furcations 53 of the lever 40 are engaged against
washer 5I, the -spring 49 being engagedbetween
arcuate end surfaces 56 of a pair of wings 51 35 ments are-accommodated within the hub of the
driven element I9. The levers 32 are partially
,
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nested in the levers 40.
,
, “
Rotation of the adjustment ring 44 with refer
formed on the washer 5I.
It will be apparent that other available forms
and arrangements for engaging and disengaging
the clutch may be provided in combination with
their pivots 4I, the furcations 53 moving to the
my novel‘clutch plate and driving assembly to
left and compressing the springs 49.
which the present case is primarily directed.
The cam ring 44 forms a support for a clutch I
While I have described my invention in con
cover B0 which has a ring 6I snugly fitted on the
_nection with its specific embodiment thereof, it
periphery of the cam ring 44 and tapers rear
wardly and inwardly to an opening 32 which re 45 i-s to be understood that this is by way of Villus
ence to the driven element 20 causes the levers
49 to be adjusted in a clockwise direction around
ceives the operating member 2|. '
`
In the operation of the clutch, assuming it to
be in disengaged position as shown in Fig. 2, the ,
rotation of torque transmitting ring IIi by the
power source as contemplated will result in the 50
tration and not by way of limitation and the
Scope of my invention is~ defined solely by the
appended claims which should be construed as
broadly as the prior art will permit.
>I claim:
'
free arcuate segments I1 being moved radially
outwardly bringing the teeth 9a thereof into close
.engagement with the opposed teeth I2 of the
1. In a friction clutch, an annular torque
Itransmitting member having internal teeth, a
ment through the coil springs 49 and the washers -
said loosely confined -segments being adapted to
be clamped between said facings during driving
plurality of circumferentially spaced facing car
torque ring I0. The movement of operating cam ' rying segments having external teeth-- meshing
29 to the left in Fig. 2 will cause the rollers 39 55> with said internal teeth, a pair of facings secured
to the respective sides of said segments, and aÍ
to ride radially outwardly against the cam face
plurality of segments, loosely confined between
30, in turn causing the levers 32 to pivot in a
said fa-cings and the ends of said supporting seg
vcounterclockwise direction about their fulcrum
ments and having peripheral teeth meshing with
pivots 33. The arms 31 of the levers 32 will swing
said internal teeth and adapted to snugly engage
tothe right as viewed in the drawings, drawing
the same under the effect of centrifugal force,
the bolts 50 to the right, and transferring move
5I, to the adjustment levers 40, causing the latter
to swing in a counterclockwise direction.
The
operation ofthe clutch to minimize blacklash
outer‘arms 42 of the levers 40, bearing against 65 between said annular member and said facing
the cam ring 44, transmit the movement to the
drivenelement 20, advancing the latter to effect l
clutch engagement. The reaction is transmitted
carrying segments.
2. In a friction clutch, an annular torque
transmitting member having internal teeth, a
plurality of circumferentially spaced facing car
from the levers 32 to the pivots 33, thence to the
fulcrum member 35 and the driven element I9. 70 rying segments having driving connection with
said torque-transmittingmember, a pair of fac
Thus the two driven elements are drawn together
ings secured to the respective sides of said seg
into clutching engagement with the drive ele
ments, and a plurality ofsegments, loosely con
ment I3. As engagement is attained, the spring
ñned between said facings and the ends of said
49 will yield, and thus the engaging pressure is
fixed at `a maximum. determined by the spring 75 supporting segments and having peripheral teeth
2,413,810
engaging said friction facings therebetween sub
sequent to the initial rotation of said torque ring
whereby said second named plurality of arcuate
plates are held between said annular facings in
positions wherein the teeth thereof cooperate
with the teeth of said torque ring to prevent
backlash between said ring and said first seg
meshing with said internal teeth and adapted to
snugly engage the same under the effect of cen
trifugal force. said loosely confined segments
being adapted to be clamped between said facings
during driving operation of the clutch to mini
mize backlash between said annular member and
said -facing carrying segments.
3. In a friction clutch arrangement, means
mental plates.
A
5. In a friction clutch, an annular torque
defining an annular torque transmitting ringv
having radially inwardly extending teeth on the
inner periphery thereof, a first plurality of sepa
transmitting member; a plurality of circumfer
entially spaced facing carrying members havirg .
driving connection with said torque-transmitting
member; a pair of facings secured to the respec- „
having radially outwardly lextending teeth on the'
tive sides of said circumferentialïy spaced mem
outer periphery thereof meshing with said inner
bers; and a ‘plurality of centrifugally influenced
peripheral teeth of said torque ring, a pair of
members loosely confined between said facings
annular friction facings secured to the opposite
and the ends of said carrying members and nor
sides of each'of said first plurality of plates and
mally rotatable with said torque-transmitting
a second plurality of circumferentialiy spaced
member, and means for effecting a snug engage
segmental plates interposed between the ends of
successive ones of said first named plates, said 20 ment of said centrifugally influenced members
with said torque-transmitting member under the
second plurality of plates having radially out
influence of centrifugal force for effecting a driv
wardly extending teeth and being freely movable
ing connection between said loose members and
radially outwardly between said facings under
rate circumferentially spaced segmental plates
the influence of vcentrifugal force to effect close
engagement of said teeth of said second plurality
of plates with the inner peripheral teeth of said
torque transmitting ring upon said ring and
Aplates being rotated prior to clutch engagement,
whereby backlash between said ring and said first
plurality of segmental plates is prevented during
clutch engagement.
4. In a friction clutch arrangement, means
defining an annular torque transmitting ring
having radially inwardly extending teeth on the
inner periphery thereof, a first plurality of sepa
rate circumferentially spaced segmental plates
25
said torque-transmitting member, said loosely
confined members being adapted to be clamped
between said facings during driving operation of
the clutchwhereby to minimize backlash between
said torque-,transmitting member and said facing
' carrying members.
6. In a friction clutch, an annular torque
transmitting member having internal teeth; a
plurality of clrcumferentially spaced facing sup
_ porting members having external teeth meshing
with said internal teeth to establish a driving
connection with Ísaid torque-transmitting mem
ber; friction facings secured to opposite sides of
lsaid supporting members; a plurality of centrifu
having radially outwardly extending teeth on the
gally influenced members loosely confined bef`
outer periphery thereof meshing with said inner
tween said facings in the spaces between said
peripheral teeth of said torque ring, a pair of
annular friction-facings secured to the opposite 40 supporting members; peripheral teeth on said
centrifugally influenced members normally loose
ly meshed with said internal teeth and adapted
to be snugly engaged therewith under infiuence
segmental plates interposed between the ends of
of centrifugal force; and clamping members be
successive ones of said first named plates, said
second plurality lof plates having radially out.. 45 tween Which said supporting members, friction
facings, and centrifugally influenced members
wardly extending- teeth and being freely movable
are adapted to be clamped during driving opera
radially outwardly between said facings under the
tion of the clutch, whereby the clamped centrifu
infiuence of centrifugal force to >eñect close en
gally influenced members are eñective to mini
gagement of said teeth of said second plurality
mize backlash between said torque-transmitting
of plates with the inner peripheral teeth of said
member and said facing supporting members.
torque transmitting ring, means including a pres
sides of each of said first plurality of plates and
' a second plurality of circumferentially spaced
sure plate and means for operating the same for
`
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RAYMOND A. CARLSON.
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