US2393305A - Centrifugal pendulum - Google Patents

Centrifugal pendulum Download PDF

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Publication number
US2393305A
US2393305A US510704A US51070443A US2393305A US 2393305 A US2393305 A US 2393305A US 510704 A US510704 A US 510704A US 51070443 A US51070443 A US 51070443A US 2393305 A US2393305 A US 2393305A
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pendular
supporting part
mass
pendulum
combination
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US510704A
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English (en)
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Birkigt Louis
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/14—Suppression of vibrations in rotating systems by making use of members moving with the system using masses freely rotating with the system, i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2121—Flywheel, motion smoothing-type
    • Y10T74/213—Damping by increasing frictional force

Definitions

  • the object ofthe present invention is to provide a centrifugal pendulum of the type above ⁇ stated which' is suspendedL in a manner better adapted tofmeet the Vrequirements of practice Y than'it was the-:case with the prior apparatus.
  • lig..V 2 is a sectionalview on the line IIe-Il?v of Figli 'f Fig. 3 isr a'sectional view on a.v larger scale of a centrifugal pendulum made according to one embodiment of the invention;
  • Fig. L is a view, corresponding to Fig. 3,--partly in sectional view on the line IV ⁇ IV of Fig. 3 and partly in elevational view; Y
  • FIG. 5 shows anotherembodiment of the invention,v being a sectional View on thev line V-fV ofFig. 6;' f Y e Fig.: 61 is a sectional view on the line VI-VIof Fig.5-; Y.
  • Fig. 'Z is a perspective view ofthe 4centrifugal pendulum of Figs.5 and 6;
  • 4li'g. 8 is a perspectiveV view ⁇ of some elements of this pendulum prior to their assembly; y
  • Fig; 9 is a diagrammatical view of a pendulum made, according to th'e invention, in suchy manner that its pendular length can increase in accordance with thefcentrifugal force.
  • This shaft- I is provided with a plate or disc r2 and this disc is connected to a pendular mass 3 through ⁇ at least two flexible links 4, each of which is applied at its ends on convex surfaces Sand E belonging respectively to' massff3 and Ydisc 2. y
  • these surfaces are given the shape of ,equal surfacesof revolution about axes Band C, respectively fixed with respect to the pendular mass and to the disc carried by shaft l.
  • raxes B and C are common lto thesurfaces that cooperate with the-right andA left flexible links of the rbifllar sus.-
  • the surfaces 5 that belong to the pen- 'dular mass may then be given the shape of a complete surface of revolution, andtheY surfaces 6 that belong to disc 2 are given an identical shape.
  • links 4 can consist of loops passing around said surfaces, in a manner analogous to that of albeit passing around twopulleys of equal diameters. f f l It will be readily understood that,with such an arrangement, when mass 3 is given a pendular oscillatory movement, it remains constantly parallel to itself. In otherwords, the ⁇ movement it undergoes isof the translatory kind. l I
  • Links .4 caribe constitutedby wires or thin i bands, for instance of textile material (natural or artificial silk) or of metal either inthe form of wires orof steel or .other metal ribbons Mofa will be chosen in accordance with the natural period that the pendulum to obtain is to have for each revolution of shaft I.
  • links 4 instead of being in the form of complete loops, may be made each in the form of separate elements. The ends of these elements will then be fixed respectively to surfaces and 6 at points thereof such that, when the pendulum oscillates with the maximum amplitude 2A, said link elements still remain .tangentially applied against said surfaces.
  • I might also limit each of the surfaces in question to the arcs, corresponding to an angle 2A, along which, during the oscillation, moves the point of tangential contact of the link element with said surfaces.
  • I might also provide, for each link, centers B1, C1 and B2,C2 such that B1 and Bzon the one hand and C1 and C2 on the other hand do not coincide'. I n this case the distance from B1 to B2 must be equal to the distance from C1 to C2. Likewise, the distances from B1 to C1 and from B2 to C2 must be equal to each other and to the pendular length 1". y 'y A device embodying theserconditions is illustrated by'Figs, 3 and 4. y
  • these surfaces 5 and B are advantageously made as follows, as illustrated by said Figs. 3 and 4: They are given a comb-like structure, that is to say are-provided with teeth extending along the directrices of said surfaces and engagi-ng between one another with a certain play, For instance, a tooth or element 1 of one of the surfaces, say 5, passesl freely between two teeth or elements 8 of the other surface 6.
  • the links will be given the shape of bands simultaneously in contact with portions of said teeth I and 8.
  • the pendular length r' can be made as small as it is desired with'reference to the common radius of surfaces 5 a-nd 5.
  • the pendular mass is constituted by the superposition of three plates ⁇ which may for instance be obtained by merely cutting them by means of a press from steel plates.
  • the two outer plates or discs, I9 and 2i), are made of the same thickness, a1
  • the inner plate or disc 2l is made of a thicknessln substantially equal to two of ai.
  • each of the outer plates I9 'and 20 is provided with projections at the respective ends of the diameter by which it is limited, thesek projections of the cylindrical periphery of the plate constituting the equivalent of the teeth 8 of the embodiment of Figs. 3 and 4.
  • the inner plate 2I is bevelled at the ends of the diameter to which it is limited.
  • v'shaft' I for cooperating with the pendular mass thus formed is also made by the superposition of three plates similarto those above referred to, but which are preferably given slightly derent ,lthicknesses.
  • the teeth AIl are carried by the outer plates I9 and 20 of the pendular mass
  • the outer plates 22 and 23 of the support Y will be made of a thickness ai greater than a1 by iii) some tenths of a millimeter
  • the inner plate 24 of said support will be given a thickness b2 smaller than.b1 by some tenths of a millimeter.
  • the support constituted by the superposition of plates 22, 23 and 24 can be xed through any suitable means to disc 2, for instance by means of the rivets 25 through which the plates in question are assembled together.
  • vA centrifugal pendulum made as above described may also-involve the following feature, which may, in some cases, be used separately.
  • the suspension means of thependular mass of the apparatus is ar.. ranged in such manner that agiven increase of the centrifugal force dueto the rotation of shaft I produces an increase ofthe pendular length r' of the pendulum.
  • FIG. 9 An embodiment of such a device is shown by Fig. 9.
  • each of the links 4 is xed to an arm II capable of pivoting about axis C through an angle D corresponding to an are of the surface B which lcoacts with the link 4 that isV being considered, said arc corresponding to angle D being located beyond the arc correspond ing to the maximum amplitude 2A.
  • means may fbe provided for reducing the lfriction resulting'from the displacement that takes place between .links 4 and the surfaces along which'said links wind and unwind, when thependular length varies and said surfaces are fixed.
  • I may provide rollers I8 or the like between each link 4 and the surface which supports it.
  • rollers I8 or the like between each link 4 and the surface which supports it.
  • -l'. might arrange said surfaces in such manner as to have them pivoting asa whole about axis C when lever Il itself pivots.
  • 1 v .Y In a general manner, while I have, in the above description, disclosed whatI deem: to be practical and ellicient embodiments of .my invention, it should be well understood that I do notk wish to be limited thereto as there might be changes made in the arrangement, disposition and'form of the parts without departing from the principle of the present invention as comprehended within lthe scope of the appended-claims.
  • dynamlc vibration rhunpingl .device including a pendulum which comprises in combination, a supporting part, la ⁇ 'penvzlular mass, at least v.two corresponding surfaces, one rigid with said supporting part and the other rigid with lsaid pendular mass, and twoflexiblelinks each secured at ⁇ one end to saidsupporting part and .atl the other-fend to said Ipendular mass so as each to pass around said two Asurfaces and to wind on one while .simultaneously unwinding from the other during pendular oscillation.
  • a dynamicvibration damping device including a pendulum 'which comprises, ⁇ in combination, la
  • a dynamic vibration vdamping device including Aa pendulum which comprises, in combination, a supporting part, a pendular mass. two pairs of rvcorresponding surfacesyeach pairA consisting of a surface rigid ⁇ with said supporting part and a corresponding surface rigid with said pendular mass, the surfaces ⁇ rigid with the supporting part being elements of a surface of revolution about an axis'r fixed with.
  • the surfaces rigid with the pendular mass being equal elements of a surface of revolution about an axis .fixed with'respect to said mass, and -two flexible links each secured at one end to said supporting part and at the other yenduto said pendular mass soas each to pass around the two surfaces of" one pair land to winden oneof said .two surfaces while simultaneouslyv unwinding from the other during pendular oscillation.
  • a dynamic vibration damping device including a .pendulum which comprises,l in combination,
  • a supporting part a pendular mass, two identical sur- Faces fof 4revolution one rigid with said supporting ⁇ partand the other rigid with said kpendular' mass, andilexiblemeans connecting said supporting part and said pendular mass in spaced relationship and disposed so as to pass around the two surfacesv and to wind on one While simultaneously unwinding from the other during pendular oscillation.
  • a dynamic vibration damping device including a pendulum which comprises, in combination, a supporting part, a pendular mass, at least two corresponding surfacesone rigid with said vsupporting ,part and the. other rigid with said pendular mass, and two flexible elements each secured at one end to said supporting part Aand at the other end to said pendular mass so. as each to .pass aroundl the two surfaces and to wind on one .while simultaneously unwinding from the other during pendular oscillation.
  • a dynamic Vvibration damping device including a pendulum whichV comprises, in combination, a supporting part, a pendular atl ⁇ least -two corresponding surfaces, one rigid v,with said supporting part and the other rigid with'said pendular mass, and two flexible bands each sependulum which comprisesin combination, a
  • a dynamic vibration damping device including a pendulum which comprises, in combination, a supporting part, a pendular mass, two pairs of corresponding surfaces, each pair consisting of a surface rigid with said supporting part and a corresponding surface rigid with said pendular mass, and two flexible links each secured'at one end to said supporting part and at the other end to said pendular mass so as each to pass around the two surfaces of one pair and to wind on one of said surfaces while simultaneously unwinding from the other during pendular oscillation, each surface being limited to the portion along which moves the point of tangencyof the corresponding link thereon, for the maximum amplitude of oscillation.
  • a dynamic vibration damping device including a pendulum which comprises, in combination, a supporting part, a pendular mass, two pairs of ycorresponding surfaces, each pair consisting Y of a surface rigid with said supporting part and an equal surface rigid with said pendular mass, these two last mentioned surfaces being of revolution about respective axes fixed to said supporting part and to said mass, respectively, the disi tance between the axes of the surfaces rigid with the vsupporting part being equal to the distance between the axes of the surfaces rigid with the pendular mass, and two flexible links each secured at one end to said supporting part and at the other end 'to said pendular mass so as each to pass around the two surfaces of one pair and to wind on one of vsaidtwo surfaces while simultaneously unwinding from the other during pendular oscillation.
  • a dynamic vibration damping device including a pendulum which comprises, in combination, a supporting part, a pendular mass, two pairs of corresponding surfaces, each pair consisting of a surface rigid ⁇ with said supporting part and a corresponding surface rigid with said pendular mass, and two flexible links each secured at one end to said supporting part and at the other end to said pendular mass so as each to pass around the two surfaces of one pair and to windI on one of said surfaces while simultaneously unwinding from thev other during pendular oscillation, said surfaces being of comb-like structure, so that the teeth of one of themV engage freely between the .teeth of the corresponding one.
  • a dynamic vibration damping device including a pendulum which comprises, in combination, a supporting part constituted by a plate the edge of which is of circular shape, extending over more than one semi-circle, a pendular mass constituted by a plate parallel to the rst mentioned plate and the edge of which is of circularshape, extending over more than onesemi-circle of the same diameter as the first mentioned one, and two flexible bands each secured at one end to the circular edge of one Aofsaid plates and at the other end. to the circular edge of the other plate so that each band is tangent to the edges of the two plates in suchrmanneras to wind on one of said edges whileA simultaneously unwinding from the other during pendular oscillation.
  • a dynamic vibration damping device including a pendulum which comprises, in combination, a 'part formed by three semi-circular discs assembled together side by side, the two outer discs including projections beyond the diameters that limit them so that their peripheries cover more than one semi-circle and the inner disc being bevelled at its ends so that its periphery covers less than one semi-circle, another part made of three semi-circular discs of the same diameter as the first mentioned discs assembled together side vby side, the two outer discs ybeing bevelled and the inner one provided .with projections, one of said composite parts forming the supporting part of the pendulum and the other the pendular mass, and atleast one flexible band each secured both 'to the'circular edge of one of said parts and to the circular edge of the other part, so as to wind on one of said edges while unwinding from the other during the pendular movement, the thicknesses of said discs 'being so chosen that the projectionsof ⁇ one
  • a dynamic vibrationV damping device including a pendulum which comprises, in combination, a part formed by three semi-.circular discs assembled ⁇ together side by side, the two outer dises including projections beyond the diameters that limit them so that their peripheries cover more than one semi-circle and the inner disc being bevelled'at its ends so that its periphery covers less than one semi-circle, another part made of three semi-circular discsof the same diameter as theV rst mentionedr discs assembled together side by side, the two outer discs being bevelled and the inner one' provided with projections, one of said composite parts forming the'supporting part'of the pendulum and the other the pendular mass, and'two nexible bands each secured at one end to the circular edge of one of said parts and 'at thefother end to the circular edge of the other part, so -as to wind on one of said edges while unwinding from the other during f the pendular movement,'the thickness
  • a dynamic vibration damping device including' a -pendulum which comprises; in combination, a
  • a dynamic vibration damping device including a pendulum which comprises, in combination, a supporting part, a pendular mass, at least two corresponding surfaces, one rigid with said supporting part-and the other rigid with said pendular mass, and two flexible links each secured at one end to said supporting part and at the other end to said pendular mass so as each to pass around said two surfaces and to wind on one while simultaneously unwinding from the other during pendular oscillation, said links being adapted to produce increase of the pendular ⁇ radius when the centrifugal force increases.
  • a dynamic vibration damping device including a pendulum which comprises, in combination, a supporting part, a pendular mass, at least two corresponding surfaces one rigid with said supporting part and the other rigid with said pendular mass, and two flexible links each secured 'at one end to said supporting part and at the other end to said pendular mass so as each to pass around said two surfaces and to wind on one while simultaneously unwinding from the other during pendular oscillation, said links being elastically secured to at least one of the'two parts to which they are secured at their ends so as to produce an increase of the pendular radius in response to an increase of the centrifugal force.
  • a dynamic vibration damping device including a pendulum which comprises, in combination, a supporting part, a pendular mass, at least two corresponding surfaces, one of circular shape rigid with said supporting part and the other with said pendular mass, and two exible links each secured at one end elastically to said supporting part and at the other end rigidly to said pendular mass so as to pass around said two surfaces and to wind around one while' simultaneously unwinding from the other during pendular oscillation, the elastic securing of at least one link to said supporting part consisting of an arm pivoted about the center of the circular-shaped surface of said supporting part, with means for xing the end of said link to the end of said arm,
  • pendulum which comprises, in combination, a
  • a dynamic vibration damping device including a pendulum which comprises, in combination, a supporting part, a pendular mass, at least two correspending surfaces one rigid with said supporting part and the other rigid with said pendular mass, and two flexible links each secured at one end to said supporting part and at the other end to said pendular mass so as each to pass around said two surfaces and to wind on one while simultaneously unwinding from the other during pendular oscillation, said links being elastically secured to at least one of the two parts to which they are secured at their ends so Y as to produce an increase of the pendular radius in response to an increase of the centrifugal force, and means for reducing friction between each link and the corresponding surface of the supporting part upon sliding of one on the other.
  • a dynamic vibration damping device including a pendulumwhich comprises, in combination, a supporting part, a pendular mass, at least two correspondinglsurfaces, one rigid withv said supporting part and the other rigid with said pendular mass, and two flexible links each secured at one end to said supporting part and at the other end to said pendular mass so as each to pass around said two surfaces and to wind on one While simultaneously unwinding from the other during pendular oscillation, said links being l adapted to produce increase yof the pendular ra- LOUIS BIRK'IGT.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)
US510704A 1943-04-07 1943-11-17 Centrifugal pendulum Expired - Lifetime US2393305A (en)

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FR981427T 1943-04-07
FR982979T 1943-08-11

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GB (2) GB577803A (is")

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2486118A (en) * 1947-10-01 1949-10-25 Cons Laundries Corp Counting machine for laundry articles
US2806968A (en) * 1953-12-03 1957-09-17 Westinghouse Electric Corp Color-corrected light source and phosphor mixture therefor
DE102010028849A1 (de) * 2010-05-11 2011-11-17 Zf Friedrichshafen Ag Schwingungstilger

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2486118A (en) * 1947-10-01 1949-10-25 Cons Laundries Corp Counting machine for laundry articles
US2806968A (en) * 1953-12-03 1957-09-17 Westinghouse Electric Corp Color-corrected light source and phosphor mixture therefor
DE102010028849A1 (de) * 2010-05-11 2011-11-17 Zf Friedrichshafen Ag Schwingungstilger

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BE453950A (is")
CH251485A (fr) 1947-10-31
GB604219A (en) 1948-06-30
GB577803A (en) 1946-05-31

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