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Патент USA US2412436

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Dec.' .10, 1946.
H, „_ VANDERZEE
' 2,412,436
FLUID OPERATED 'CLUTCH
Filed March 22, 1944
2 Sheets-Sheet 1
SW.,
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Dec. 1.0, 1946.
H. H. vANDr-:RZEE
2,412,436
FLUID OPERATED CLUTCH
Fíledjlarc‘n 22, 1944
2 Sheets-Sheet 2
2,412,436
Patented Dec. 10, 1946
UNITED STATES -PATENT OFFICE
FLUID OPERATED CLUTCH
Harry H. Vanderzee, Racine, Wis., assignor to
Twin Disc Clutch Company, Racine, Wis., a
corporation of Wisconsin.
ApplicationMai-ch 22, 1944, Serial No. 527,620
6 Claims. (Cl. 192-85)
1
2
.
eiiectuated will be definitely pointed out in the
My invention relates' to clutches and more par- ,
ticularly to those of the fluid actuated type in
which any selected fluid under pressure, either
claims.
‘
‘
=
In the drawings:
'
- Fig. 1 is a longitudinal section of my improved
gas or liquid, is applied to a piston which constitutes the actuating element of the clutch.
Clutches of this general type wherein an an
clutch in disengaged position >taken alongthe
nular piston applies the engaging pressure are
line I-l in Fig. 2.
Fig. 2 is an end view of the clutch looking vin
well known and, for certain installations, they
the direction of the arrow 2 in Fig. 1.
possess a, number o'f advantages overthe more
commonclutch arrangement in which the en
gaging pressure is applied at spaced locations
around the clutch through mechanisms includ
y
Fig. 3 is an enlarged, fragmentary, sectional
10 view of the clutch as shown in Fig. l, but in
engaged position.
Fig. 4 is an enlarged elevation of the head end
of the spring bolt as Viewed in Fig. 1.
' ing links and levers. Some of these advantages
v are a uniform and continuous application of the
Fig. 5 is anenlarged, fragmentary view of the
engaging pressure around the clutch, quick ac 15 clutch engaging face of the pressure plate show
tion in engagement and disengagement which is
ing the relation of the head end of the spring
particularly important when the associated ma»
chine is designed for repetitive, short Working
bolt thereto.
.
'
Referring to thel drawings, the numeral l0
designates a shaft which for purpose of descrip
. cycles, and capacity for rapid acceleration and
deceleration and quick reversals.
20 tion will be regarded as 'the driven member and
which is secured by a key il to a hub l2 having
When employed under the foregoing conditions,v
at one end a flange i3 which acts as the back or
the eiiicient control and dissipation of the gen
abutment plate of the clutch.
l erated heat presents a serious problem because it
The hub is pe
ripherally splined or toothed at lli for axially~
is important that the fluid cylinder assembly,
including the release springs, be kept relatively 25 slidable and rotarily driven engagement with in
ternally toothed plates l5 that are alternately
cool.
e
One object of my invention is to provide a ñuid
operated clutch in which important manufactur
ing and operating advantages, relative toprioi"
i
related to friction plates I6 which are externally
toothed for engagement with` a driving member
- (not shown), such as ab' iiywheel or other part.
clutches of this type, are achieved -by the manner 30 The direction oi drive through the clutch may be
reversed without affecting its operability. _
of forming the air cylinder and of .relating the
A ring Il abuts the end of the hub l2 remote
' piston
A further
and clutch
objectpressure
is the provision
plate thereto.
in the -"Ifore
from the iiange i3 and is secured thereto by
going type of clutch of -means, other than the
piston, for piloting the piston during its move
ments in order to lessen ,wear on the piston pack
ing’.
`
l
A further object is to devise a clutch of the
means of a plurality of cap screws i8.
35
This ring
is provided with a peripheral and continuous,
annular wall I9 that extends toward the clutch
plates I5 and I6 and- forms with the adjacent
end o1’ the hub I2 an annular cylinder 20. Slid
' character indicated wherein the member which
' ably mounted in the cylinder is a piston assern'n
with a hub or generally any rotating member,
ried on the extension 23, cap screws 25 serving
deiines a portion of they air cylinder also carries 40 bly comprising a piston 2| provided with suitable
packing 22 that may -be cup-shaped and an
the release springs and transmits the reactive
annular extension 23 that projects laterally from
thrust of the fluid medium.
'
and is preferably integrally formed with a pres
A further object is to provide a release spring
sure plate 24 which, in the released position of
mechanism for a clutch of the type wherein a
45 the clutchshown in Fig. 1, abuts vthe inner end
pressure plate has toothed driving engagement
of the wall i9. The piston 2l abuts and is car
the mechanism being arranged to accommodate
to rigidly secure these parts together, while the
relative rotative movements of the plate due to
extension pilots the pressure plate 24 and the
worn teeth without hampering the effectiveness 50 piston 2| in the cylinder 20, thus enabling >the
of the mechanism.
l
plate and piston to move freely without cocking
These and further objects of my invention will
and reducing wear of the packing 22. The radial
be set forth in the following specification, ref
portion of the packing is clamped between the pis-V
erence being had to the accompanying drawings,
ton 2l and extension 23.
' `
and the novel means by which said objects are 65 The plate .24 is internally toothed forsdriving
2,412,436" '
tive to the ring I1, but the ability of the l‘oolts 36~
engagement _with the teeth I4, thus preventing,
to move angularly’relative to the plate maintains
by reason ofçthe rigid connection of this plate to
the full functional capacity of the release mech
the piston assembly, any rotation of the piston
anism. Rotationbf each .spring bolt 36 about its
2| relative -to the cylinder. But for this connec
axis is prevented by providing a lug 43 (see Fig. 5)
tion, _such rotation would occur during engage
which is oii‘set from the head 35 that is prefer
ment and disengagement of the clutch and would
ably cylindrical in-shape and this lug loosely fits
result in undue wear of the piston packing 2,2
fa groove 44 form‘ed in the Wall of the associated
with consequent leakage or “blow by” of the air.
In a clutchwhose working cycle is repeated at
It is important to provide some method of
short intervals. this wear becomes critical- and 10
cooling the springs 4I for unless the heat con
lrequires frequent servicing of the unit. Fur
ducted to the springs from the pressure plate 24
ther, where itis necessary 'that the clutch be
is dissipated to a considerable extent, the springs
quick acting, air leakage must be reduced to the
quickly lose their temper and effectiveness. Ac
utmost'minimum, otherwise the clutch will be
15 cordingly, portions ‘of the springs are exposed
characterized by slow action.
f
through the ring wall I9 to the cooling action of
Air, 4or any desired fluid, is introduced into the
socket 34.
cylinder 20 through connecting'passages in the
`
-«
»
,
` _the atmosphere by means of continuous grooves
shaft I0 andhub I2. Specifically, a rotating air
seal (not shown) is applied to either endrof the
shaft I0, depending upon the position relation _of
thelloadtothe clutch, the right end being vs_e-'
lected'in the present' instance. The vshaft IU-ex-v
'
tends through the ring I1 andv would be sup
ported normally in a Ibearing (not shown) before]
receiving the seal which provides a connection 25
between a, source of air under pressure and an
45 in and around this wall, the grooves being
sufilciently deep to intersect the pockets 40. The
grooves also assist in cooling the ring I1 and piston
assembly by 'increasing the surface of the ring for
radiation _and the »wiping action of the air as the
clutch rotates.
.
~
l
It wilibe observed that the piston assembly 1n’
the retracted position illustrated in Fig. 1 sub
stantially fills the cylinder 20. Where air is em- i
ployed as the actuating medium and a quickly re
sponsive action is desired, it is important in view
axial passage 26 which extends part way through ‘ '
the shaft I0.. Seals of this type are well known
of the highlycompressiblenature of~ air that the
in the art. The inner end of the passage 2B com- '
municates with radial 'passages 21 in the shaft. 30 volume o_f airbehind the piston in its retracted
each of which is aligned with a radial passage 28 . v"position-be held to a minimum.
of larger diameter in the hub I2 and the outer end
of each passage 28 is closed by a plug 29. Longi-_
t'udinal passages 30 in the hub connect .the sev- f
eral passagesy 28 with/'radial recesses'3l in the 35
ring I1,'the outer en of the recesses communi
cating with the cylinder> 20. The difference in
_diameters of the passages 21 and 28 creates an
nular shoulders 32 constituting parts of the shaft v
The construc
r tion shown accomplishes this result.
.
The clutch is characterized, particularly in the
air cylinder and operating mechanism portions
thereof, by simplicity and compactness, ready ac-~
cess for repair and replacement, and long life of
the parts by reason of the cooling and piloting
features.
‘
-
'
’
'
I claim: `
surface and a seal ring 32a is compressed against 40 l ' .1. _A fluid-operated clutch comprising in com
- bination, a hub, friction members having toothed
_each of the shoulders by a nut 33 threaded in the
connection with the hub anda separate rotary
inner end of tlîe associated passage 28 to preventI
part, respectively, a ring member Vabutting one
air leakage -along the shaft.
'
end of the> hub and forming therewith an an
When air under pressure is supplied to the cyl-`
inder 20„the piston assembly, including the pres 45 nular cylinder for receiving the ñuid medium, an
annular piston movable in the cylinder, a clutch
sure plate 24, -is-'moved toward the left from the
position shown in Fi'g. 1 to that indicated in Fig.
pressure plate having toothed connection with
- -` 3, thus clamping the plates I5 and lli-against the
the hub, the plate being piloted in the cylinder
thrust of the ring I1 is
'and movable in one direction by the piston, ‘a
taken by the cap screw I8. Upon release 'of the 50 plurality of bolts spaced -around the plate, each
air pressure, the clutc plates are freed for re
_ having a head loosely fitting within a socket pro
^ turn to the vrelease position shown in Fig. 1 by
vided in the plate and having a shank extend
means of _a spring actuated bolt arrangement
ing loosely through and into a .correspondingly
which constitutes a feature of the invention. Ex
positioned pocket in the member, and a helical
' tending inwardly-from the clutch plate, contact
spring encircling each shank between an abut
ing face of the pressure plate 24 is a, plurality of _,
ment thereon and the base of the associated
'f-iiange I3. The reactivlg
» circumferentially, spaced sockets 34, each of which
loosely receives lthe head 35 of a >spring~ bolt- 36
whose shank extends loosely through apertures 38
pocket for shifting the plate in the opposite
Y direction.
2. A fluid operated clutch comprising in com
and 39 provided, respectively, in the plate 24 and 60 bination, a hub, friction members having toothed
the inner end of the wall I9 and thence'into a
connection with the hub and a separate rotary
pocket 40 disposed in aligned relation to the aper-_ , part,
respectively, a ring member abutting one
tures in the wall I9 and plate 24.
1
‘
j_'endof
the hub andvforming therewith an an
A helical spring 4I encircles that portion of
.nular cylinder for receiving the fluid medium,
,each shankv winch is included within 1the asso 65 an annular piston movable in the'cylinder, a
, ciatecl pocket, one end of the springî seating
against the base o-f the pocket 'while the' opposite
end abuts a sleeve nut 42 that is threaded on the
shank and slidably fits the pocket wall. When the "
- clutch pressure plate having toothed connection
with the hub, the plate being piloted in the cyl-inder and movable in one direction by the piston,
a plurality of bolts spaced around the plate, each
_clutch is engaged, the springs are compressed. 70
_ having a head loosely ñtting within asocket pro- ,
The loose mounting of the bolts 36 in the pres
vided in the plate and having a shank extendingsure plate 24 and wall I9 enables these bolts to
loosely through and into a correspondingly posi
operate freely and without strain as the'teeth of
tioned pocket in _the member, the head and socket
thepressure plate Wear. This wear would permit
small rotational movements of the plate 24 rela 75 vwall having interengaging. formations preventing
2,412,436
5
rotation of the bolt, and a helical spring en
circling each shank between an' abutment there
on and the base of the associated pocket for
shifting the plate in the opposite direction.
3. In clutch construction wherein a pressure
plate has a toothed connection with `a rotary
member and is shifted in one direction to engage
the clutching members, means for shiftingthe
plate in the opposite direction comprising a plu
rality of bolts spaced karound the plate each
having a head loosely fitting within a socket
provided in the plate and having a shank ex- '
tending loosely through and into a correspond
lngly positioned pocket in the member'whereby
the bolts may move angularly relative to the
plate, and a helical spring encircling each shank
between an abutment thereon and the base of
the associated pocket.
4. In clutch construction wherein a pressure
plate has a toothed connection with a rotary
member and is shifted in one direction to engage
the clutching members, means for shifting the
plate in the opposite direction comprising a plu- g
rality of bolts spaced'around the plate each hav
ing a head looselyfltting within a socket provided
in the plate and having a shank extending loosely
through and into a correspondingly positioned
pocket in the member whereby the bolts 'may
move angularly relative to the plate, the head
and socket wall having interengaging formations 30
preventing rotation of the bolt, andaI helical
spring encircling each shank between an abut
ment thereon and the base of the associated
pocket.
5. A ñuid operated clutch comprising a hub
having an annular cylinder for receiving the
fluid medium, an annular piston movable in the
cylinder, a clutch pressure plate having toothed
connection with the hub, the plate being mov
able in one direction by the piston, a plurality
of bolts spaced around the plate, each having a
head loosely ñtting within a socket provided in
the plate and‘having a shank extending loosely
through and into a correspondingly positioned
pocket in themember, and a helical spring en
circling each shank between an abutment there
on and the base of the associated pocket for
shifting the plate‘in the opposite direction.
6. A fluid operated clutch comprising a hub
having an annular cylinder for -receiving‘the
fluid medium, an annular piston movable in the
cylinder, a clutch pressure plate having toothed
connection with the hub, the plate being movable
in one direction by the piston, a plurality of bolts
spaced around the plate, each having a head
loosely fltting'within a socket provided in the
plate and having a shank extending loosely
through and into a correspondingly positioned
pocket in the member., the head and socket wall
having interengaging formations preventing
rotation of the bolt, and a helical spring en
circling each shank between an abutment there
on and the base of the associated pocket for
shifting the plate in the opposite direction.
mnRY H. VANDERZEE.
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