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Патент USA US2406244

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Aug. 20, 1946.
I
H. NUTT` '
FRICTION CLUTCH
`Filed. May 24, 1943
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2,406,244
Patented Aug. 20, 1946
21,406,244
`UNITED STATES PATENTl OFFICE
FRICTION CLUTCH
Harold Nutt, Chicago, Ill., assigner v,to Borg
Warner Corporation, Chicago, Ill., a corpora
tion of Illinois
Application May 24, 1943, Serial No. 488,163
’7V Claims. (Cl. 192-99)
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Thisr invention relates to friction clutches of
the. type employed in motor vehicles and has as
its general object to provide an improved mech
threaded end» I5 of the eye bolt, and engaging
cover.
washer is designed so as to have a zero rate
the outer end of the boss 9.
The Belleville Washer I2 takesover the func.
anismr :for mounting the release levers and con
tion of the former hold back spring in main
necting them to the pressure plate of a clutch 5 taining the adjusting nut in snug engagement
of this type.
with the cover member at all times. Thus the
A specific object of the invention is to elimF
Belleville washer in combination with the snug
inate` the necessity for the conventional hold-back
fitting characeristics of the pivot pin and strut,
spring. A further object of the invention is to
eliminates the necessity lfor the hold back spring. `
provide an improved adjustable mounting for
The Belleville washer has the further function
the lever fulcrum eye bolt. The invention in
of providing a substantially constant positioning
this respect is particularly applicable to a heavy
load on the eye bolt throughout the normal range
duty clutch of a type employing a cast metal
of adjustment thereof. For this purpose, the
f
These and other objects and features of this 16 deflection characteristic.
invention will become apparent from the follow
The Belleville washer I2 is suñiciently stili to
ing speciiication when taken together with the
resist the axial component of centrifugal force
that may be developed in the lever I'I when the
weight of the latter is centered rearwardly (to
ing the invention.
20 the right as viewed in the drawing) of the pivot
As an example of one form in which the in
pin I9, as when the lever is in engagedposition
vention may be embodied, the drawing shows a
after the facings have become worn so that the
heavy duty clutch adaptable for use in military
packed thickness of the driven vmember as
tanks. Such a clutch may embody a cover I
semblies is reduced. It will be apparent that
of cast metal such as cast steel, suitably con 25 such a centrifugal force, in conjunction with the
toggle arrangement of the outer end of the lever
nected to a driving member, indicated in broken
lines at 2. Twin driven discs 3 and an interven
and the head of the eyebclt, woulddevelop a
ing, iioating pressure plate 4, likewise indicated
component tending to press the eyebolt rear
in broken lines, are adapted to be packed in fric
wardly and against the Belleville washer I2.
tional engagement with each other and with a 30
In conventional lever arrangements of this gen
pressure plate 5 and the driving member 2 by
eral type it has been customary to provide the
pressure transmitted through the lever mecha
eye bolt with a tail portion extending through
nism forming the subject matter of my invention.
the lever and into a recess in the pressure plate
My improved lever mechanism embodies a
in order to provide adequate support against the
lever fulcrum eye bolt 6 having a prism-shaped
outward pressure of the lever, acting under cen
shank 'I received in a correspondingly shaped
trifugal force, against the eye bolt. Because of
aperture 8 in a boss 9 formed in the cover I.
the close ñt of the shank 'l in the aperture 8 for
A shoulder I0 at the base of the head portion
a substantial axial distance, this tail portion may
be and is eliminated by the present invention.
I I of the eye bolt 6 is engaged against the inner
The extended ñt of the shank 'I in the aperture
portion of a Belleville washer I2 which` in turn
8, in connection with the non-circular cross
is engaged at its periphery against the inner
sectional shape of these parts, also makes it pos
end of the boss 9. Inwardly of the radiusA where
sible to utilize the eye bolt as the means for
it is engaged with the Belleville Washer spring I2,
accompanying drawing which shows an axial sec
tional view through a portion of a clutch embody
supporting the f lever I1 against displacement
the boss 9 is counter-bored to pro-vide an annu
lar space I3 into which the inner portion of the 45 about the axis of the eye bolt, the head portion
spring I2 may be ñexed if necessary.
II being formed with flat sides snugly fitting be
tween the wall portionsr f8 of the lever to effect
this purpose. Thus the conventional practice of
cal shape to the flat washer shape shown in the
iitting the side -wall portions of the lever over a
drawing and is thus adapted to move a limited 50 part of the pressure plate lug so as to support the
extent on either side of the flat plane of its ñat
lever against displacement about the axis of the
washer shape in order to accommodate the ad
eyebclt, is eliminated.
justment of the eye bolt 6 toward and from the
The head portion II of the eye bolt 6 is
pressure plate 5. Such adjustment is effected
provided with an eye I6 which is elongated
by rotating a nut I 4 threaded on the reduced 55 transversely of the bolt. A release lever I'I, of
The spring I2 is pressed from a normally coni
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2,406,244
4
` 3
back-lash between the lever and said yfulcrum n
channelled construction having side walls I8 em
bracing the head II, is pivoted to the eye bolt
element in this direction, whereby the necessity
for a hold-back spring is eliminated.
3. In combination with a pair of clutch' mem
extending through the eye I6. The pintle I9 has
very slight clearance in the eye I6 longitudinally 5 bers, an operating lever having -a portion ful
crumed with reference to one of said members
of the bolt, thus` eliminating backlash between
4and having a pivot pin, an eye bolt having a. non
the lever I1 and theeyebolt in a direction par
cylindrical shank'fitted into a correspondingly
allel tothe clutch'axis'.V
'
' ‘ '
shaped aperture in the Vother member, said eye
_ The outer end of the lever I'I is formed withV
a saddle 20 in which is seated one end of a strut 10 bolt having a head in which said pivot pin is
` ' by a pintle I9 mounted in the side walls I8 and
2| the other end of which is seated in a notch 22nl ' lfulcrumed, a Belleville washer interposed be
' tween said head and said other memberwith said
in a driving lug 23 formed on the pressure plate
5. The driving lug 23 is received in and adapt-v
head engaged against the inner portion of said
washer and said other member having a recess
deñned within a raised annular fulcrum against
edA to have driving engagement with a pocket 26 ,
formed in the cover I.
The saddle 20 and strut 2l are accommodated
which the- peripheral portion of said washer is
I engaged,.and an adjusting nut threaded on the
with only slight clearance in a recess 21 in the
driving lug 23, so as to eliminate back-lash be
end of said eye bolt opposite said head and en
gaging said other member on the side thereof
tween the outer end of th'e lever and the pres-` '
sure plate. ' As a result of eliminating back-lash.
opposite said Belleville washer.
4. The combination defined in claim 3, where
at this point and in the eye I6, it has been `pos
sible to eliminate the hold back spring conven
' tionally employed for reducing back-lash in the
lever linkage.
I claim:
Y
A
in said Belleville washer is stressed to a substan- y
tially flat plane and is capable of being stressed
into said recess on one side of said plane’or be
25 coming unstressed to a position lying on the
f
other side of said plane.
yl. In combination with a pair of clutch mem-` Y
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5. The combination defined in claim> 3, where
in said eye bolt head has flat side faces embraced
by side wall portions of said lever and thereby
ber, said fulcrum element having a non-circular
` region and an eye, a lever having a pivot` pin ful-` 30 'holds said lever against displacement about the `
axis of said eye bolt.
crumed _in said eye, and _an end portion project
6. A combination as deñned in claim 3, where
ing into said recess, means on said leverisnugly
in said end portion of the lever is received'in a>
ñtting said non-circular region to maintain'said
bers one having a recess, a fulcrum element car-4`
` -ried _by the other member free of the ñrst mem
recess in said one member, and including a strut "
interposed between one side of said recess and ,
lever against displacement around said "element,
and a strut interposed between said end portion
said lever `end portion, the latter being main- v
and one side of said recess, said strut maintain
tained by said strut in close proximity tothe
` ' ing said end portion in bearing relation with re
v other side of said recess so as vto eliminate back-"ji
spect to the other» side of said recess so as to
eliminate any apDIeciable'back-lash between said
end portion and said‘recessed‘clutch member,
saidr pivot pin being fitted in said eye with sunl
lash in said recess, and said pivot pin being fitted
40 in said eye with no backlash therein, whereby the
necessity for a holdback spring is eliminated. `
7.'A clutch comprising a driving> member; a
Y cient snugness transversely of the lever to elim
f inate any appreciable back-lash'therein, where
clutch'pressure plate coacting therewith having
by the necessity for a hold back spring is elimi
nated.Y
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a recess; a Vcover plate carried by said driving
. _member; a shouldered fulcrum member adjust
ably carried by said cover and having an eye and f
a flattened region adjacent said eye; a lever hav
2.I In combination'with a Ãpair of clutch mem- l
bers one having a recess defined between opposed I
ing apivot pin fulcrumed in said eye andan end
surfaces, a fulcrum element carried> by the other
portion projecting into said recess, said lever hav
member and having a non-circular region' and
an eye,`a lever having a pivot pin extended . Ying a channeled portion snugly ñtting the nat
tened region of said fulcrum’member for main-V
throughrsaid eye and an end portion in the form'
taining said lever against displacement around K
of avfsaddle having a convex surface in bearing
the axis of said fulcrum member; a Belleville type
. relation ¿Vith respect to one of saidopposed sur
spring washer on said fulcrum member in ten
faces,'said lever having side portions fitting said
non-circular region thereby preventing sidewise
55 sionedrelation to the shoulder thereon, and a »
displacement of said lever, a strut having one end
received in said saddle and its other end ful
crumed against the `other of said opposed sur-`
faces, said strut and saddle together ñlling the
space between said opposed surfaces with only
slight clearance so as to eliminate any appreciable
back-lashrbetween said end portion and said re
cessed clutch member, and said eye being elon
gated longitudinally of said lever to permit said ,
pin to ‘have rolling contact therewith and em-` 65
bracing said pin snugly -in a direction transversely
of‘ said lever so as to eliminate any appreciable
strut interposed between saidend portion of the -
lever and a side of said recess, said strut main
taining said lever end portion in bearingrela
tion with respect to the opposite side of said re
cess so as to eliminate any appreciable back-lash ‘
between said end portion and said pressure mem
ber, said pivot pin being ñtted in said eye with f
suiiicient snugness -tranversel‘y of Vsaid leverv to`
eliminate any .appreciable back-lash therein,
whereby rthe necessity for ahold-back spring is
eliminated.
HAROLD
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