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Патент USA US2369679

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Feb; 20, 1945.
2,369,679 '
Filed NOV. 16, 1939
2 Sheets-Sheet l
Feb. 20, 1945.
Filed Nov.,l6, 1959
2 Sheets~Sheet 2
6"- 797573522'04: ',
Patented Feb. 2t), 1945
‘t?aifa'elre Matteueci?frurinlltaly; .vesteriLin-tj’tlie .
J Alieriii'lflzoperty Gustodian
tzAp‘plication November‘ 16, '1939, SerialiNb. 30, “83.5
zlgclaims.‘ (01:174-514.)
their;loopucomponents. ‘rl'Theiselectov a‘s arranged
‘ Dampers-0f’ the torsional-ivi-brationswofr rotat
in ' (‘combination v-withxidamping members wwhiich
‘ ing: sh'afts. arerkno‘wn ‘in which the passivelwo’rk
transformithe collected energy into; passivevwwk
for: the .l-damping effect, ld'onel ' at the‘ expense. of
through) the; oscillatory-'ideformaztionsI ofnatheore
silientv member, amid: ithrou'ghirthe;iosdillatoryadis
the energy -:transmitted "by 2 them,‘ 1is - "effected in '
dependeneebon i-angiii-lar ‘ldisplacements of kmasses, '
placementsof-ztheinertia ‘masses;
with regard to the ‘shaft, ‘set upwby their’ inertia »
. T
" :Thanks to'ithei'i selectori Iformed‘ by ?ht-L‘EIYBSlliBht
I reactions'to' the'di‘stiirbances of‘fthe rotary mo
deformable: fmemb'errsandi the; imassess'movingeby
tio'niset I uplby'l'the “Said; torsional-vibrations.
~ ‘It is also a known~practice to ?t‘ to the ‘resilient
‘ inertia,=l-there' are r collected: hmtheukinetic“; energy ;
joints 1 of "revolving 1V shafts, ldampersiof the -‘-os-. 10 transmitted \ aiongztheqcentrerzlinezbyziall? the’? tor
sionali vibrationstwithout; difstinotiongstwoidistinct
cillatoryldeformations ‘or the: resilient parts pro- "
ducin'g'ipassive iworkatl‘th'e expenseof- the said
and ‘centinuouslceurrentsnof ienergy ‘nwhich zeare
progressively:v tr‘anstormedtintoji'passive workcby
‘ the2 two] :trlan's'former idamperi-zmembers, sof that
-? Neither -o'f1'>these' types of damper ‘Y is able-to
' dampwouth'alli' the torsional vibrations of shafts. 15 all the vibrations, without 'exceptioneare'damped
byl the dissipation :ofiithe: kinetic 2 .ene-r-gys. setlsup
Thef-formeridamp out only those vibrations which
- in'?them; by‘v the-excitinglimpulsesisorzby; opposing
present - tad-them '~ the loop ~zone in-iwvhiehg'as it‘ is
known, the rotary ~vmotion of "the shaft1 is dis
inother manner-telthe-re‘sonanee; .
' :The'adamping transformerimembers whichipro
Barbed:angularlw-while'they are-not responsive '
to those-vibrationswhich present to-them'the 20 ‘duce the damping se?‘ortwrewpreferably thlocks
t arranged in la;tciirclei'coaxiallyuaroundithe shaft.
node where the-rotary motion‘ is-not disturbed‘.
These: ablo‘cks-Lmider s thexin?uenceeoff centrifugal
The-"latter behave. inexactly the opposite-‘man
force“. oreazcomhinationrof this :and Itheszaction
ner, F'being quite einsen‘sible’to' ‘those-vibrations
of; isprings..orzotherlzknowm ‘suitable. uneansa; press
which occur: to them in- ‘the ‘loop; as'they do > not
25 against the ~vinne'rzisurfaee'iofrttn ianmilant'member
but "comeintowaetion "if, at the ~point'at‘iwhieh - which surrounds 1 them anduproducetthieir effect
by sliding 1' backwards eand 2 fonwards, ziunde‘réithe
they are‘; amounted,‘v there-‘r‘happens ' to‘ be ‘a node
modify' the-icoup1e acting-"onv the‘ resilient: joint;
, I in?uence ofszthe resilient: de'formablenmember’
or’;-a‘= ‘prevalently ‘nodal. zone of vibrations; 1 as a in
suehlizones the torsional ‘vibrations '“develop‘in
theishaft torsional stresses.
v '
An object of':-Jthe present invention is toepro
vide-‘awdamperwcapable of acting universally! on
oro?the inertia masses.
some :forms of; re'aliza'tiom ofzthe object: ofsiahe
invention ‘rare v'sh'owni-imerely .by'riwayrrof :exam
p1e;iin' the‘ annexedixdrawingszini'iwhieh:iFig.this
all =torsiona1 vibrations whether .in a node or nodal
‘longittidinalzseotioni o? onevform of. theiuniversal
zone; orfin'ial loop or ‘loop-zone. Another object
oft-he inventioni-is-to automatically vary the in
tensity .of the ‘damping effort indirect ratio to
the‘ variationsiin the-speed of rotation. ‘Another
‘object is to be able-to regulate the --sensi-tiveness
of the damper;v and a ' further object-is ‘to I be able
to regulate ' this" 's'ensitiveness independently‘ for
thei‘vibrationslewhioh» act upon‘ the ‘damperin‘ the
loop-Y/zon-Ies iandg-forv ‘those which act on itin ‘the
dam-perilfFigszrziaandnasairei partiali'reross sections
nes32= --;:.2a:.-;and-; 3;r.-ee3:c.1~iofoEig.1-1;
, '
f-Eig; Ari .isaa‘ longitudinal;seetionalwiewm? an
other :for-m-tsof :universal .wiibr'ationi-ldamper,
' 'rEig. 115:».is ‘a a sectional “view iofaainnodt?eation
taken-onithe?ine V-,—15V1Of'Fig.6.
f ' t .
' y‘
t v
' '1' Fig. 1:6 ‘is 1: azsse’ction'al 1 view5 tween-con-~ ithe % iline
VI-LVI' ofiFig's?.
‘ ‘
.i-Eig; This amend-mew of. a‘ modil?édidriv-i-ng’con
nectionlbetween- the1dru-m5and-itheliheritia inasses.
- This ‘damper;- which forms’ ‘a group intended
insertedh'between- two coaxially-rotating :45 ample, Iin'l‘Eig. 1 i the idamperyisiapplied ‘ion; the
line shafting'g'efeai turbine idifivenrfshipr { The-pro
shaftaione ‘drivingliand the ‘other driven; is char
aeterizedlby-a'selector consisting of laresi-lient de
formable member mounted on the centre The of
'7 the shafts -in--such are/manner as to be deformed
\p'e‘llor shaft; t isldrivenjbyithe shaft-2 of'ali'oi‘di
'naryvreducingilgear"'giriven ‘b
stant; and"-the"~resistant "0 hg‘torque,
load collpl'e heing'IIIalso
in’ an; oscillatory sense“ by' the vibrations acting ~50 this-application,"‘thelidri
, upon it ~with\a-r_node or with‘their nodal compo-4
n'ents;-I and‘wby :inertia masses angularly 'moveable -
around the ‘shaft‘and'Mar-ranged in'gsu'chiaiway
as‘fto'-'beemovedeinian- oseillatory sense‘jby those
' Vibrations which *act‘npon it-‘by‘a loop‘ or ‘with
substantially'constantaiigl'ioiilyf tigijbéd‘jbyj?the
rhythmic I impulses I of the-see YI_
i-vibra?bnsiis. resets mite-rena- thie'rerbre
the; elasticidéformable" member‘ whieh serves‘ to
select and collect by its deformations the kinetic
energy of the vibrations acting with a nodal char
acter, has but a slight elastic work to perform.
It is therefore constituted only by a bar 3, stressed
by the driving torque to a high speci?c torsion
load and which therefore effects fairly ample tor~
sional de?ections in consequence of the disturb
ances of the rotary moment set up in it by the
torsional vibrations of nodal character. This bar
blocks 1 can be provided, on their periphery, with
a friction shoe 1°, similar to the blocks 8° of the
inertia ring 8 and similarly retained on the rela
tive block 1 by moveable pins 9’ lodged in slots
cut in part in the thickness of the block 1 and
in part in the friction shoe 1°. In this case the
pressure exerted by the block on the inner sur
face ‘of the recess 4° is equal to the sum of the
centrifugal actions developed in the block 1, in the
3 is arranged inside the shaft 2 of the reducing , 10 friction shoe 1° and in the pins 9'. Also in this
gear, which is hollow, and 'coaxially therewith.
case the pressure exerted by the blocks 1 can be
The right hand end of the bar 3 engages the shaft
integrated by springs Ill’ lodged in suitable re
2 by means of grooves and its left hand end en
cesses in the block and in the friction shoe.
gages in a similar manner with _a hub of a drum
Thanks to the above described conformation
4 ?xed to the end of the propellerv shaft I. At 15 the pressure with which both the blocks 8° of the
the left hand end of the reducing gear shaft 2,
inertia ring 8, and the blocks 1 with their fric
opposite the bottom of the drum 4, is ?xed a disc
tion shoes 1° are pressed against the inner sur
5 which is provided with a number of teeth 5’
_ face of the recess 4°, abstraction made of the pres
regularly spaced and projecting from its left face.
sure exerted by the eventual springs Ill and I0’,
The teeth 5', through an equal number of slots
is furnished by centrifugal force and is therefore
4' in the drum, penetrate for a certain distance
proportional to the square of the speed of rota~
into an annular recess 4° arranged in the periph
tion of the whole, so that also the damping effort
ery of the drum 4, which recess is preferably di
is proportional, the displacement of the blocks
vided into two compartments by an intermediate ' being equal, to the square of the said speed.
diaphragm 6, loose. with regard to the drum. Be 25 In Fig. 4 is represented diagrammatically the
application of the damper to two shafts I, 2, sub
tween the said teeth 5’ are engaged angularly
jected to a driving torque affected by strong
with regard to the centre line of the shaft, but
free to move radially, an equal number of fric
cyclic irregularities, as would be the case, for in:
, tion blocks 1 lodged in one of the two compart
stance, in the coupling together in tandem two
ments of the recess 4°. These blocks 1, which 30 Diesel engines without a flywheel. As in this
case the quantity of kinetic energy transmitted
form together a crown, make‘contact, with their
faces furthest from the axis, with the inner sur
by the vibrations is considerable, the elastically
face of the peripheral recess 4° of the drum
deformable member which serves to select and
against which they are pressed in the manner
gather by its deformations the kinetic energy of
which will be described later.
3.5 the vibrations acting with a nodal character has
The nodal‘ action vibrations disturbing the in
to perform a very large amount of elastic Work
tensity of the driving torque applied to the elas
and has therefore to assume the constructional ,
tic member 3, set up in it ?uctuations of the de
forms and dimensions of a real and true ?exible
formations of the torsion and consequently cause
coupling of considerable power. In this case,
a corresponding oscillatory displacement of the
while one part of the elastic deformations is
utilized to perform the work of damping the
blocks 1 in the recess 4° of the drum 4. As these
blocks are pressed against the inner surface of
torsional vibrations, another part of it reduces
the cyclic irregularities of the driving torque and
the recess 4° of the drum by centrifugal force,
they produce, in their to and fro sliding on the
of the rotary motion dependent upon it, thus
said surface, the passive damping work on the ,
attenuating the stresses set up by the torsional
vibrations produced by the said irregularities.
nodal action vibrations. .
In Fig. 4 is represented a coupling, of the
Within the said recess 4° of the drum 4 is lo
cated, alongside the‘ crown of blocks 1, a loose
known type described in British Patents 508,425
ring 8 which, reacting by inertia to the disturb
and 510,104 which lends itself well to this ap
ances of the rotary motion set up in the drum 4 .50 plication. Any other known type of ?exible
. coupling may, however, be employed.
by the loop action vibrations, moves on it angu-'
larly with an oscillating motion. On this ring 8
The inertia rings 8 and 8° with their relative
is ?tted a series of blocks 8° retained on the ring
blocks for the damping of loop action vibra
8 in the direction of rotation by movable pins 9
tions, in every way similar to those already de
lodged in substantially radial'slots cut partly in
the thickness ‘of the ring 8 and partly in the thick- ‘
ness of the blocks 8°, which are thus free to move
in a radial direction under the in?uence of cen
55 scribed, are mounted respectively on the drums
4° and 5a of the discs 4 and 5 which carry re
spectively the lugs 4° and 5° engaging with the
elastic members 38 of the joint.
trifugal force and are‘ pressed against the in
The blocks 1 for the damping of nodal action
ternal surface of the recess 4° of the .drum 4. 60 vibrations, revolving together with the disc 4 by
means of special engagement pieces 3| ?xed to
When, by reason of loop action torsional vibra
tions, the inertia ring 8 is subjected to oscillatory
the drum 4°, but free to move'radially, act on
angular movements with reference to the drum
the drum 5a revolving together with the shaft 2,
4, the blocks 8° rub with a reciprocating motion
through the joint action of oscillatory movements
against the. inner surface of the recess 4° and 65 determined by the deformations of the elastic.
perform the passive work of damping the said
group caused by the nodal action vibrations, and
vibrations. The pressure exerted by the blocks
by the pressure set up in them by any suitable
8° on the inner surface of 4° by the action of the
centrifugal force developed in them and on the
The assembly of the blocks which produce the
moveable pins 9, can be eventually integrated by .70 damping effect forms three coaxial annular
' springs l0 also located in suitable recesses in the
groups, located alongside the elastic group.
ring 8 and in the blocks 8°.
It is evident that, the lower the speed of the
The blocks 1 are pressed against the-inner suré
driving shaft, the larger must be the inertia
face of the recess 49 by the action ofthe centrifu
gal force set up in them during rotation. These
masses of the selector intended to collect the
kinetic energy of the vibrations acting on it with
a loop or with loop components. In cases where
the speed of the driving shaft is low it is there
fore advantageous, in order to avoid the use of '
too large inertia masses, to increase the rota
tional speed of such masses, having recourse, for
example, to the arrangement‘,shownyinv Figs. 5
shaft and a driving shaft, an elongated resilient
member connecting said shafts, a drum rotated
by said shafts having circumferentially spaced
slots therein, a disc rotated by said shafts and
arranged adjacent said drum, circumferentially
spaced teeth carried by said disc projecting into
the slots of said drum, a plurality of circumfer
entially movable and radially movable friction
blocks arranged within the drum and moved by
drives one or more adherence rollers 32, of 10 said teeth, a ring arranged within said drum,‘
and other blocks carried by the ring and adapted
smaller ‘diameter, two in 'the example illustrated,
to move in radial directions under the in?uence
held in close contactwith its periphery by suit
and 6 where the drum 4, rigid with the driven
shaft I, contains only the blocks for the damping
of the ,nodal action vibrations. The drum 4
of centrifugal force and to engage said drum.
able means. For this purpose the rollers 32 are
2. A universal damper of torsional vibrations
carried on the arms 35,, oscillating about shafts
35', which tend to be drawn towards each other 15 of co-axial rotating shafts comprising, adriv
ing shaft and a driven shaft, means including a
by a spring 36, so that the two rollers are held
resilient member connecting said shafts for driv
in adherence with the drum 4 at diametrically
opposite points. On the spindle 33 of each ofthe
ing the driven member ‘from the driving" mem
ber, drum means surrounding the axis of the
taining the mobile inertia masses 8. These 20 shafts, a ‘disc rotatable with said shafts and ar
ranged adjacent to said‘ drum ‘means, a plurality
masses, since they revolve at a higher speedthan
of circumferentially movable and radially mov
the driving shaft, are of a smaller size than they
able friction blocks arranged within the drum
would have to be if they rotated at the same
means and operatively connected with saiddisc,
speed as the said shaft. Instead of rollers,
a ring arranged within said drum means, and
toothed wheels 32“ may be employed, engaging
other blocks carried by the ring and adapted to
with teeth on the periphery of the drum 4, as
move in radial directions under the in?uence of
shown in Fig. '1.
centrifugal force and to engage said drum means.
I claim‘:
l. A universal damper of torsional vibrations
of coaxially rotating shafts comprising, a driven 30
, said rollers is mounted a secondary drum 34 con
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