US2316288A - Device for preventing speed oscillations and vibrations of the rotary members of machines - Google Patents

Device for preventing speed oscillations and vibrations of the rotary members of machines Download PDF

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Publication number
US2316288A
US2316288A US250910A US25091039A US2316288A US 2316288 A US2316288 A US 2316288A US 250910 A US250910 A US 250910A US 25091039 A US25091039 A US 25091039A US 2316288 A US2316288 A US 2316288A
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bearing surfaces
masses
mass
radius
named
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US250910A
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English (en)
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Salomon Francois Marie Bernard
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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
    • Y10T74/2173—Cranks and wrist pins
    • Y10T74/2183—Counterbalanced
    • Y10T74/2184—Vibration dampers

Definitions

  • movable auxiliary masses which are subjected to the action of centrifugal force and are adapted to oscillate under the action of the disturbing forces and under the retracting of the system without a bifilar suspension are such that at least one of the auxiliary masses, other than the first, oscillates by translation without substantial rotation relatively to the machine member in question.
  • bifilar suspension This method of mounting, which is sometimes called bifilar suspension, may be efficient in certain cases, but it offers considerable drawbacks as regards complication and risks of wear.
  • the device being formed by one or a plurality of. groups of at least two centrifugal auxiliary masses, the first of which is freely connected to the member of the machine and the other or each of the others to the previous one.
  • the device is characterized by the fact that the geometrical and dynamic characteristics obtain, by purely dynamic means, a suspension of the masses whichi's equivalent to the bifilar suspension.
  • the device according to the invention may moreover be given all the practical embodiments described in the aforesaid U. S. patents, and also numerous other embodiments, some of which will be'described hereinafter.
  • each auxiliary mass which is adapted for oscillatory translation may be connected to the rotary machine member not only by one oscillating mass, but by a plurality arranged in series.
  • Fig. 1 is a diagram illustrating the principle of the invention
  • Fig. 2 is an elevation view, partly in section and with parts broken away and parts removed, showing one practical embodiment of the invention as applied to the counterbalance-weight of an engine crankshaft;
  • Fig. 3 is a sectional view taken substantially on line 33 of Fig. 2 by showing a slightly modified form of the invention
  • Fig. 4 is an elevation view, partly in section and with parts broken away, showing another practical embodiment of the invention.
  • Fig. 5 is a sectional view taken substantially on line 55 of Fig. 4;
  • Fig. .6 is a side elevation view, partly in section and with parts removed, of still another embodiment of the invention.
  • Fig. 7 is a sectional view taken substantially on line 1-4 of Fig. 6.
  • Fig. 1 the machine member which is shown diagrammatically at 5, is rigidly secured to a shaft l for rotation therewith, said shaft having its axis at 0. It is the object of the invention to substantially reduce or prevent the speed and/or torsional oscillations of said shaft.
  • the part 5 is provided with a cylindrical roller way or bearing surface (3 having a radius R and an axis K which is spaced a distance d from the axis 0. q
  • a mass 112 having its axis at M is provided with two cylindrical roller or bearing surfaces: by means of one, D, having a radius 1", it rolls on the surface C and by means of the other, D, having a radius r' it conjugates itself with the cylindrical roller or bearing surface C of a mass m, said last-named surface having a radius R and anaxls M.
  • the masses m and m are connected to each other and to the part 5 only by the free rolling contact. produced by centrifugal force.
  • the axes M and M occupy the positions Mo, M'o, in the plane determined by the axes O and K, the axes O, K,.M and M being constantly parallel and perpendicular to the plane of the figure.
  • the geometrical and dynamic elements 6f the system may either be determined by calculation, or by experiment, and may differ more or less from those which would ensue from said equations.
  • the relative rotation of the mass m might moreover not be absolutely nil.
  • Figs. 2 to 7 show, by way of non-limitative examples, different possible manners of mounting the auxiliary masses according to the invention.
  • Fig. 2 shows a partial front and partial sectional elevational view of a device embodying three systems of damping masses and in which in each system, the first series of masses includes a mass-ll having internal bearing surfaces which rolls on external bearing surfaces of axially extending arm portions in which are carried by and fixed in relation to member 5.
  • Each mass I I comprises two cheeks, one on each side of memher 5, assembled by means of bolts l5, one of the cheeks of the left-hand mass I I, as viewed in the drawing, being removed.
  • Each mass II has roller ways l2 for a mass iii of the second series which carrie lateral cheeks H.
  • Fig. 3 shows a longitudinal section of a modification of Fig. 2, in which the reference numerals corresponding to those of Fig. 2 are supplemented by thevacccnt m.
  • the m u' .cured to the member are shown as being independent. but this is not indispensable. A nut it holds the parts assembled.
  • Fig. 4, and Fig. 6 which is approximately a longitudinal section of the device of I'll. 4. correspond to complex systems at, m in which the masses 28' of'theflrst series roll on-internal tracks 25 which engage external bearing surfaces on arm portions l0. Masses 2
  • Fig. 6, and Fig. 7 which is substantially 0. 101181- tudinal section of the device of Fig. 8, relate to complex systems m, m in which the two series of masses roll on roller ways that are inside same.
  • the masses ll of the second series are formed by cheeks which, by way .of example, may be assembled by means of bolts 44, but could be independent of each other.
  • One of the cheeks of the left-hand weight 48 is removed in Fig. 8;
  • FIGs. 2 to 7 show, by way of example. a number of embodiments in which various combinations are effected of inner and outer roller ways, in pendulums having two stages of rolling oscillating masses.
  • abutments not shown. limit the amplitudes of the oscillations.
  • the number of masses of each stage, their 5 may be absolutely of any kind: counterbalanceweight arm of an aircraft engine, flywheel of an engine or of a compressor, etc. It may be placed at any point of the rotary shaft, and, in the machine, said shaft itself may be the main shaft or any other shaft.
  • Apparatus for damping oscillations in a rotatable-member having an arm rigid therewith and extending radially from the axis of rotation thereof comprising means rotatable with said member including an axially extending portion having an arcuate external bearing surface on both sides of said arm, said bearing surfaces being radially displaced from and curved convexly toward said axis, damping means including masses freely suspended on said axially extending portions and having internal arcuate bearing surfaces engaging said first-named bearing surfaces, the radius of said internal bearing surfaces being greater than the radius of said first-named bearing surfaces, and a damping mass movably supported solely by said firstnamed masses and having arcuate bearing surfaces engaging arcuate bearing surfaces on said first-named masses, the radius of curvature of the last mentioned bearing surfaces of said firstnamed masses being greater than the radius of curvature of the cooperating bearing surfaces on said second-named mass and said second-named mass having free rolling movement along the cooperating bearing surfaces of said first-named masses
  • Apparatus for damping oscillations in a rotatable member having an arm extending radially from the axis of rotation thereof comprising means rotatable with said member including an axially extending portion having an arcuate external bearing surface on both sides of said arm, the latter being radially displaced from and curvedconvexly toward the axis of rotation of said member, a first mass suspended on said axially extending portions and having internal arcuate bearing surfaces engaging said first-named bearing surfaces, the radius of said internal bearing surfaces being greater than the radius of said first-named bearing surfaces, and a second mass supported solely by said first mass and having arcuate external bearing surfaces engaging the internal bearing surfaces of said first mass on opposite sides of said arm and being free to roll thereon, the radius of the bearing surfaces of said first mass being greater than the radius of the bearing surfaces on said second mass and the latter having free rolling movement along the cooperating bearing surfaces of said first mass.
  • Apparatus for damping oscillations in a rotatable member having an arm extending radially from the axis of rotation thereof comprising means rotatable with said member including axially extending means 'having an external arcuate bearing surface on each side of faces on said masses, the radius of curvature of the internal bearing surfaces of said second damping means being greater than the radius of curvature of the external bearing surfaces of said masses.
  • Apparatus for damping oscillations in a rotatable member having anarm rigid therewith and extending radially from the axis of rotation thereof comprising means rotatable with said member including opposed axially extending portions on opposite sides of said arm, said portions having arcuate external bearing surfaces which are radially displaced from and curved convexly toward said axis of rotation, a first damping means freely suspended on said axially extending portions and having internal arcuate bearing surfaces engaging said firstnamed bearing surfaces, the radius of said internal bearing surfaces being greater than the radius of said first-named bearing surfaces, and a second damping means constituted by a damping mass movably supported solely by said first damping means and having arcuate bearing surfaces engaging arcuate bearing surfaces on said first damping means at opposite sides of said arm, the radius of curvature of the bearing surfaces of one of said damping means being greater than the radius of curvature of the cooperating bearing surfaces on the other of said damping means and said second damping means having free rolling movement
  • Apparatus for damping oscillations in a rotatable member having an arm rigid therewith and extending radially from the axis of rotation thereof comprising means rotatable with said member including an axially extending portion having an arcuate external bearing surface on both sides of said arm, said bearing surfaces being radially displaced from and curved convexly toward said axis, damping means including masses freely suspended on said axially extending portions and having internal arcuate bearing surfaces engaging said first-named bearing surfaces, the radius of said internal bearing surfaces being greater than the radius of said first-named bearing surfaces, and a dampingmass movably supported solely by said firstnamed masses and having arcuate bearing surfaces engaging arcuate bearing surfaces on said first-named masses, the radius of curvature of the bearing surfaces of said second-named mass being greater than the radius of curvature of the cooperating bearing surfaces on said first-named masses and said second-named mass having free rolling movement along the cooperating bearing surfaces of said first-named masses.

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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)
  • Pulleys (AREA)
  • Vibration Prevention Devices (AREA)
US250910A 1938-01-08 1939-01-14 Device for preventing speed oscillations and vibrations of the rotary members of machines Expired - Lifetime US2316288A (en)

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LU523416X 1938-01-08

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US2316288A true US2316288A (en) 1943-04-13

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US250910A Expired - Lifetime US2316288A (en) 1938-01-08 1939-01-14 Device for preventing speed oscillations and vibrations of the rotary members of machines

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US (1) US2316288A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE432032A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR870385A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB523416A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8813604B2 (en) * 2011-10-20 2014-08-26 Chrysler Group Llc Pendulum vibration absorber on a crankshaft
CN115055987A (zh) * 2022-07-05 2022-09-16 深圳市誉和钻石工具有限公司 一种自主型减振刀杆

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2167517A (en) * 1984-11-27 1986-05-29 Ford Motor Co Crank mechanism

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8813604B2 (en) * 2011-10-20 2014-08-26 Chrysler Group Llc Pendulum vibration absorber on a crankshaft
CN115055987A (zh) * 2022-07-05 2022-09-16 深圳市誉和钻石工具有限公司 一种自主型减振刀杆
CN115055987B (zh) * 2022-07-05 2024-05-28 深圳市誉和钻石工具有限公司 一种自主型减振刀杆

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Publication number Publication date
GB523416A (en) 1940-07-15
BE432032A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR870385A (fr) 1942-03-10

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