DK169848B1

DK169848B1 - Oscillation compensator

Info

Publication number: DK169848B1
Application number: DK697888A
Authority: DK
Inventors: Henning Lindquist
Original assignee: Smidth & Co As F L
Priority date: 1988-12-15
Filing date: 1988-12-15
Publication date: 1995-03-13
Also published as: DK697888A; JPH02209648A; JP2852090B2; DK697888D0; KR0149164B1; KR900010265A

Abstract

An oscillation compensator includes two pivotally mounted and mutually parallel axels (11, 12) which each have a swivel part (13, 14) with an eccentric centre of mass (16, 17) in relation to its axis of rotation (15). The axels (11, 12) are mutually fixed to the same rotation speed to rotate in opposing directions in order to produce in one direction a resultant component of force equal to zero and in a perpendicular direction to this a resultant component of force which harmonically varies between zero and the double of the force (F) from the individual swivel parts (13, 14). The two axels' (11, 12) axes (15) are principally convergent. It is hereby possible to bring about a very simple and compact oscillation compensator for a given size of the resulting harmonically varying component of force, which results especially from the fact that the compensator can be designed in such a way that the swivel parts of the two axels do not stroke overlapping areas.<IMAGE>

Description

i DK 169848 B1in DK 169848 B1

Svingningskompensator omfattende to om en fælles akse drejeligt i et hus lejrede aksler, som hver har et svinglegeme med et excentrisk i forhold til deres omdrejningsakse beliggende massemidtpunkt, og som er indbyrdes forbundet til med samme 5 omløbstal at rotere i modsat retning af hinanden med henblik på i én retning af frembringe en resulterende kraftkomposant lig nul og i en retning vinkelret herpå en resulterende kraftkomposant, som harmonisk varierer mellem nul og det dobbelte af kraften fra det enkelte svinglegeme.A pivot compensator comprising two about a common axis pivotally housed in a housing, each having a pivot body with an eccentric relative to their axis of rotation, and which are interconnected to rotate in the opposite direction with the same 5 in one direction produces a resultant force component equal to zero and in a direction perpendicular thereto a resultant force component which harmonically varies between zero and twice the force of the single pivot body.

Der kendes en svingningskompensator som er beregnet til ved større skibe med 4-, 5- og 6-cylindrede dieselmotorer at kompensere for motorernes lodrette ubalancemomenter af 2. orden.A vibration compensator is known which is intended to compensate for the second-order vertical unbalance moments of the engines on larger ships with four, five and six-cylinder diesel engines.

Ved denne svingningskompensator roterer svinglegemerne således j. 5 i modsat retning af hinanden om indbyrdes parallelle akser, at retningen af den resulterende harmonisk varierende kraftkomposant står vinkelret på omdrejningsaksernes fælles plan. Omdrejningsakserne er anbragt med en sådan afstand, at sving-legemerne fri af hinanden samtidig kan passere området mellem disse. En således udformet svingningskompensator er meget pladskrævende og ofte meget vanskelig eller umulig at få plads til, f.eks. når man ønsker at modvirke skrogvibrationer hidrørende fra varierende akseltryk fra propellerne eller vari-erende sidetryk fra motorens krydshoved.Thus, at this pivot compensator, the pivot bodies rotate j. 5 in opposite directions about mutually parallel axes, that the direction of the resulting harmonically varying force component is perpendicular to the common plane of the axis of rotation. The axes of rotation are spaced such that the pivot bodies can simultaneously pass through the area between them. A vibration compensator thus designed is very space consuming and often very difficult or impossible to accommodate, e.g. when one wishes to counteract hull vibrations resulting from varying shaft pressures from the propellers or varying lateral pressures from the engine head.

Endvidere kendes fra US-A-2.914.964 en svingningskompensator, hvor akseafstanden er således, at svinglegemerne set i tværsnit eller fra siden samtidigt bestryger et fælles område mellem ^ omdrejningsakserne. Med henblik herpå består det ene svinglegem af to med indbyrdes afstand beliggende og med en navdel for- . bundne pladeformede dele og det andet svinglegeme af en med en navdel forbundet pladeformet del, som kan passere gennem mellemrummet mellem det første svinglegemes pladeformede dele. Denne svingningskompensator er godt nok forholdsvis kompakt set i tværsnit eller fra siden i forhold til førstnævnte svingningskompensator, men for opnåelse af en given harmonisk kraftkomposant vil denne kompakthed blive modvirket af en DK 169848 B1 2 * tilsvarende større længde af kompensatoren, således at der totalt ikke opnås nogen eller meget lille reduktion af kom-pensatorens volumen. f 5Furthermore, from US-A-2,914,964 a pivot compensator is known, the axis distance being such that the pivot bodies viewed in cross-section or from the side simultaneously cover a common area between the axis of rotation. To this end, one pivot body consists of two spaced apart and with a hub portion front. bonded plate-shaped portions and the second pivot body of a plate-shaped portion connected to a hub portion which can pass through the space between the plate-shaped portions of the first pivot body. This oscillator compensator is probably relatively compact in cross-section or side view relative to the former oscillator, but for a given harmonic power component this compactness will be offset by a correspondingly greater length of the compensator, so that no total some or very small reduction in the volume of the compensator is achieved. f 5

Yderligere kendes fra dansk patentansøgning nr. 1074/87 en svingningskompensator, hvor svingakserne er forkrøppet med således udformede bugter eller svinglegemer, at disse kan passere indvendigt i hinanden. Herved fremkommer godt nok en ret kompakt kompensator, men denne kompakthed er opnået på bekostning af en mere kompliceret udformning.Further, from Danish Patent Application No. 1074/87, a pivot compensator is known, in which the pivot axes are curved with bends or pivots so formed that they can pass internally to each other. This will probably result in a fairly compact compensator, but this compactness is achieved at the expense of a more complicated design.

Endelig kendes fra US-A-2610524 en svingningskompensator af den indledningsvis nævnte art til udbalancering af ubalance- kræfterne ved en krumtapmekanisme, især ubalancekræfterne 15 fremkaldt af en excenterpresses krydshoved. Denne svingningskompensator omfatter to koaksialt på krumtapakslen monterede koniske tandhjul, hvoraf det ene er fast forbundet med akselen og det andet er frit drejeligt forbundet med akselen.Finally, from US-A-2610524 a vibration compensator of the kind mentioned above is known for balancing the imbalance forces by a crank mechanism, in particular the imbalance forces 15 induced by the crosshead of an eccentric press. This pivot compensator comprises two coaxial sprockets mounted on the crankshaft, one of which is firmly connected to the shaft and the other is freely pivotally connected to the shaft.

20 Begge tandhjul er i indgreb med et spidshjul, hvorved det frit drejeligt på akselen anbragte tandhjul vil dreje med samme hastighed, men i modsat retning af det fast på akselen monterede tandhjul. Endvidere er der på et nav af hvert tandhjul løsbart for drejning anbragt en excentrisk bøsning, hvorpå der ligeledes løsbart for drejning er anbragt et svinglegeme med excentrisk massemidtpunkt, dvs. svinglegemerne er anbragt excentrisk i forhold til deres omdrejningsakse. Både den excentriske bøsning og svinglegemet fastholdes på tandhjulet ved hjælp af bolte. Ved at dreje bøsningen i forhold til svinglegemet og akslen eller alternativt dreje svinglegemet i forhold 30 til bøsningen, vil svinglegemets massemidtpunkt blive forskudt radialt og den af svingningskompensatoren frembragte haremoni- ske kraftkomposent blive ændret. På grund af at svinglegemerne er anbragt på excentriske bøsninger, der omslutter akselen, vil det område over hvilket den resulterende harmoniske kraft-35 komposant kan varieres, være relativ begrænset. Endvidere bevirker boltforbindelserne mellem tandhjulene og de koniske * DK 169848 B1 3 bøsninger henholdsvis mellem tandhjulene og svinglegemerne, at justeringen af svingningskompensatoren er relativ tidskrævende .Both gears engage a sprocket whereby the gears placed on the shaft freely pivot will rotate at the same speed, but in the opposite direction of the gears mounted on the shaft. In addition, an eccentric bush is mounted on a hub of each sprocket, on which a pivot body with eccentric center of mass, also located, is detachable for rotation. the pivoting bodies are arranged eccentric to their axis of rotation. Both the eccentric bush and the swing body are retained on the sprocket by bolts. By rotating the bushing relative to the swing body and shaft or alternatively turning the swing body relative to the bushing, the center of mass of the swing body will be radially displaced and the harmonic force component produced by the swing compensator will be altered. Because the pivot bodies are arranged on eccentric bushes enclosing the shaft, the range over which the resulting harmonic force component can be varied is relatively limited. Furthermore, the bolt connections between the gears and the tapered bushes, respectively, between the gears and the pivot bodies, respectively, cause the adjustment of the pivot compensator to be relatively time-consuming.

55

Formålet med opfindelsen er at anvise en svingningskompensator af den indledningsvis nævnte art, som er meget enkelt og konpakt opbygget og som gør det muligt hurtigt at indstille den resulterende harmoniske kraftkomposent over et stort område.The object of the invention is to provide a vibration compensator of the kind mentioned above, which is very simple and compact, and which allows the resulting harmonic power component to be adjusted quickly over a large area.

1010

Til opnåelse af dette formål er svingningskompensatoren ifølge opfindelsen ejendommelig ved, at hvert svinglegeme omfatter en første fast på akselen monteret svinglegemedel og en anden svinglegemedel, der ved hjælp af en prespasning er monteret løsbart på akselen for en drejning i forhold til den første faste svinglegemedel, at svinglegemedelene alle har excentrisk i forhold til omdrejningsaksen beliggende massemidtpunkt, og at hver aksel er forsynet med en aksial boring og en hermed forbundet radial boring, som udmunder i den respektive løsbare svinglegemedels monteringsflade på akselen. Herved er det muligt efter monteringen af svingningskompensatoren på det ønskede sted og ved en drejning af de to løsbare svinglegeme-dele at justere den af kompensatoren frembragte harmonisk varierende kraftkomposant, således at denne nøjagtigt kompense rer for de aktuelle ubalance kræfter og -momenter. Ved at hve± svinglegemes svinglegemedele begge har excentrisk beliggende massemidtpunkt og derved begge fungerer som svinglegemer opnås mulighed for at justere.den resulterende kraftkomposent inden for et stort område. Prespasningen mellem de løsbare svinglegemedele og akslerne kan hurtigt og enkelt ophæ-3 0 ves ved gennem de aksiale og radiale boringer at presse olie frem til svinglegemernes monteringsflader på akslerne, hvorefter de løsbare svinglegemedele let kan drejes til den ønskede position i forhold til de faste svinglegemedele. Denne mulighed for en hurtig justering af den af svingningskompen-3 5 satoren frembragte kraft har i praksis vist sig meget væsentli idet der ofte må foretages et stort antal indstillinger før man i en aktuel situation når frem til den optimale.For this purpose, the pivot compensator of the invention is characterized in that each pivot body comprises a first pivot member mounted on the shaft and a second pivot member which is releasably mounted on the shaft for a rotation relative to the first solid pivot member. that the pivot members all have eccentric relative to the axis of rotation of the pivot axis, and that each shaft is provided with an axial bore and an associated radial bore, which opens into the respective removable pivot body mounting surface on the shaft. This makes it possible to adjust the harmonically varying force component produced by the compensator by the rotation of the oscillator at the desired location and by rotating the two detachable oscillating parts so that it precisely compensates for the current imbalance forces and moments. By elevating the ± oscillating body parts both have eccentrically centered center of mass and thereby both act as swing bodies, it is possible to adjust the resulting force component within a large range. The pressing fit between the detachable pivot members and the shafts can be quickly and easily eliminated by pushing oil through the axial and radial bores to the mounting surfaces of the pivot bodies on the shafts, after which the detachable pivot members can easily be rotated to the desired position relative to the fixed pivot members. . This possibility of a rapid adjustment of the power produced by the oscillator compensator has in practice proved very important, since a large number of settings often have to be made before reaching the optimum in a current situation.

DK 169848 B1 4DK 169848 B1 4

Desuden kan ifølge opfindelsen de to svinglegemedele være identiske og have samme masse. Herved fremkommer en svingningskompensator, som ud over at være fremstillingsvenlig 5 trinløst kan indstilles til at kompensere for en kraft mellem 0 og 4 gange den af den enkelte svinglegemedel frembragte kraft.In addition, according to the invention, the two pivot bodies may be identical and have the same mass. This results in a vibration compensator which, in addition to being easy to manufacture, can be continuously adjusted to compensate for a force between 0 and 4 times the force produced by the individual vibration drug.

Endelig kan ifølge opfindelsen hver af de løsbare svinglegeme-, 0 dele have et radialt hul anbragt således, at det kan bringes til at ligge på linie med et tilsvarende i en til huset hørende væg tildannet radialt hul. Herved kan med henblik på indstilling af de løsbare svinglegemedele en stift føres gennem hullet i husvæggen og ind i hullet i den pågældende svingle-„ _ gemedel og akslen derefter drejes i den ønskede grad.Finally, according to the invention, each of the detachable pivot body parts may have a radial hole arranged so that it can be aligned with a corresponding radially-formed wall in the housing. Hereby, for the purpose of adjusting the detachable pivot means, a pin can be passed through the hole in the housing wall and into the hole of the particular pivot means and the shaft can then be turned to the desired degree.

Opfindelsen forklares nærmere nedenfor under henvisning til tegningen, hvor fig. 1 skematisk et tværsnit gennem en udførelsesformThe invention is explained in more detail below with reference to the drawing, in which fig. 1 is a schematic cross-section through an embodiment

2 J2 J

for en svingningskompensator ifølge opfindelsen og fig. 2 skematisk et snit efter i hovedsagen linien IV-IV i fig. 1.for a vibration compensator according to the invention and fig. 2 is a schematic sectional view of substantially the line IV-IV of FIG. First

2525

Den i fig. 1 og 2 skematisk viste udførelsesform for en svingningskompensator ifølge opfindelsen omfatter et hus 51 bestående af en cylindrisk væg 53 og en for hver ende af denne anbragt sidevæg 54, 55, samt en kropplade 56, som er fast forbundet med den cylindriske væg 53 og opdeler husets 3 0 51 indre i to rum 57 og 58. Endvidere er huset 51 forsynetThe FIG. 1 and 2, a schematic embodiment of a vibration compensator according to the invention comprises a housing 51 consisting of a cylindrical wall 53 and a side wall 54, 55 for each end thereof, and a body plate 56 which is firmly connected to the cylindrical wall 53 and divides. the interior of the housing 3 0 51 in two compartments 57 and 58. Furthermore, the housing 51 is provided

med ben 59, 60, som er fastgjort til sidevæggene 54, 55. Iwith pins 59, 60 attached to the side walls 54, 55. I

husets 51 indre er der drejeligt om samme akse 35 lejret to aksler 61,62, som ved hjælp af lejer 68,69 og 70,71 er under- * støttet i henholdsvis sidevæggen 54 og kroppladen 56 og krop-o o pladen 56 og sidevæggen 55.the interior of the housing 51 is rotatable about the same axis 35, bearing two shafts 61.62 which are supported by bearings 68.69 and 70.71 in the sidewall 54 and body plate 56 and body plate 56 and sidewall respectively. 55th

På hver af akslerne 61,62 er der anbragt et svinglegeme 63,64, som hver består af en fast svinglegemedel 63F,64F og en løs-· DK 169848 B1 5 bar svinglegemedel 63L,64L, der er monteret løsbart på akslen 61 henholdsvis 62 med henblik på en drejning i forhold til den faste svinglegemedel 63F henholdsvis 64F. De fire svingleg« medele 63F,64F; 63L,64L har i hovedsagen samme geometri og 5 masse og er set i akseretningen i hovedsagen cirkeludsnitforme« og har derved et massemidtpunkt/ som ligger excentrisk i forho: til omdrejningsaksen 65. De faste svinglegemedele 63F,64F er monteret nærmest kroppladen 56, medens de løsbare sving-legemedele 63L,64L er monteret nær den tilsvarende sidevæg 54 henholdsvis 55.On each of the shafts 61.62 a pivot body 63.64 is provided, each consisting of a fixed pivot body 63F, 64F and a loose bar body 63L, 64L which is removably mounted on the shaft 61 and 62 respectively. with a view to a rotation relative to the solid oscillator 63F and 64F, respectively. The four turns «mean 63F, 64F; 63L, 64L have substantially the same geometry and mass and are seen in the axial direction in substantially circular sectional shapes' and thereby have a center of mass / which is eccentric in relation to the axis of rotation 65. The fixed pivot members 63F, 64F are mounted closest to the body plate 56, while the detachable swing body 63L, 64L are mounted near the corresponding side wall 54 and 55, respectively.

Ved hjælp af en drivmotor 72 drives svinglegemerne 63, 64 via en transmission 73 til i modsat retning af hinanden at rotere således, at der i vandret retning fremkaldes en kraft-komposant lig nul og i lodret retning en kraftkomposant, der varierer harmonisk mellem nul og det dobbelt af kraften F^ hidrørende fra hvert enkelt svinglegeme 63,64. Transmissionen består af en på motoren 72 udgangsaksel 74 monteret første tandremskive 82, som via en tandrem 75 er forbundet med en 20 anden tandremskive 76, som er monteret ved den ene ende af en aksel 77, der er drejeligt lejret i et første lejehus 78 anbragt udvendigt på husets 51 cylindriske væg 53. Motoren, der fortrinsvis er en AC servomotor, er ligeledes monteret udvendigt på huset 51, således som vist i fig. 1, men af illu- 2 5 strative grunde ført væk herfra i fig. 2. Ved akslens 77 anden ende er der monteret et første tandhjul 79, som dels er i indgreb med et svinglegemetandhjul- 80 , som er fast forbundet med svinglegemets 63 faste svinglegemedel 63F, og dels et andet tandhjul 81, som ligeledes er drejeligt lejret i lejehus« 3 0 78 anbragt udvendigt på huset 51. Dette andet tandhjul 81 er på sin side i indgreb med et andet svinglegemetandhjul 83, der er fast forbundet med svinglegemets 64 faste svinglegemedel 64F. Tandhjulene 79 og 81 strækker sig gennem en åbning 84 i husets 51 cylindriske væg 53 ind i rummet 57 hen-3 5 holdsvis 58, idet der i kroppladen 56 er en til tandhjulene 79 og 81 svarende udskæring, således at de går fri af krop- DK 169848 B1 6 t pladen 56.By means of a drive motor 72, the pivot bodies 63, 64 are driven via a transmission 73 to rotate in opposite directions to produce a force component equal to zero and in the vertical direction a force component which varies harmonically between zero and the double of the force F ^ arising from each pivot body 63.64. The transmission consists of a first toothed pulley 82 mounted on the output shaft 74 of the motor 72, which is connected via a toothed belt 75 to a second second pulley 76, which is mounted at one end of a shaft 77 pivotally mounted in a first bearing housing 78 arranged exterior of the cylindrical wall 53 of the housing 51. The motor, which is preferably an AC servomotor, is also mounted externally to the housing 51, as shown in FIG. 1, but for illustrative reasons removed from here in FIG. 2. At the other end of shaft 77, a first gear 79 is mounted, which is in part engaged with a pivot gear gear 80, which is fixedly connected to the fixed pivot body 63F of the pivot body 63 and partly a second gear 81, which is also pivotally mounted in bearing housing «3 0 78 located externally of the housing 51. This second gear 81 in turn engages another swivel gear gear 83 which is firmly connected to the fixed swivel body 64F of the swivel body 64. The gears 79 and 81 extend through an opening 84 in the cylindrical wall 53 of the housing 51 into the space 57 and 58, respectively, with a body corresponding to the gears 79 and 81 in the body plate 56 so that they are free of the body. DK 169848 B1 6 t plate 56.

Svinglegemernes 63,64 løsbare svinglegemedel 63L,64L er monteret * på den pågældende aksel 61 henholdsvis 62 ved hjælp af en 5 prespasning. Akslerne 61 og 62 er hver forsynet med en aksial boring 91 henholdsvis 92 samt en radial boring 93 henholdsvis 94, som fra den aksiale boring 91 henholdsvis 92 strækker sig radialt ud til monteringsfladen 95 henholdsvis 96 for den pågældende løsbare svinglegemedel 63L henholdsvis 64L.The swivel bodies 63,64 removable swing body 63L, 64L are mounted * on the respective shaft 61 and 62, respectively, by means of a 5 fit. The shafts 61 and 62 are each provided with an axial bore 91 and 92, respectively, and a radial bore 93 and 94, respectively, which extend radially from the axial bore 91 and 92, respectively, to the mounting surface 95 and 96, respectively, of the respective removable pivot body 63L and 64L, respectively.

Ved akslernes 61 og 62 mod hinanden vendende endeflader er der anbragt et tætningslegeme, som forbinder de aksiale boringer 91,92 med hinanden. I boringens 92 ydre ende er der monteret en nippel 98.At the end faces of the shafts 61 and 62, a sealing body is provided which connects the axial bores 91.92 with each other. A nipple 98 is mounted at the outer end of the bore 92.

1515

Prespasningen mellem de løsbare svinglegemer 63L,64L og akslerne 61.62 kan ophæves ved på kendt måde at tilslutte et trykaggregat 105 til niplen 98 og via boringer 91,92; 93,94 presse olie frem til grænsefladen mellem de løsbare svinglegemedele 63L,64L og disses monteringsflader 95,96 på akslerne 61,62.The pressing fit between the detachable pivot bodies 63L, 64L and the shafts 61.62 can be eliminated by connecting in a known manner a pressure assembly 105 to the nipple 98 and via bores 91.92; 93.94 press oil to the interface between the removable pivot members 63L, 64L and their mounting surfaces 95.96 on the shafts 61.62.

2020

Herefer kan ved en fastholdelse af de løsbare svinglegemedele 63L,64L ved hjælp af stifter 99,100, der er ført gennem huller 101,102 i husets 51 cylindriske væg 53 og ind i tilsvarende huller 103,104 i de løsbare svinglegemedele 63L,64L akslerne 61.62 og de herpå fast monterede faste svinglegemedele 63F,64F 25 drejes saledes, at den relative vinkelstilling af de fasteHerefrom, by retaining the releasable pivot members 63L, 64L by means of pins 99,100, passed through holes 101,102 in the cylindrical wall 53 of the housing 51 and into corresponding holes 103,104 in the detachable pivot members 63L, 64L the shafts 61.62 and the fixedly mounted thereon fixed pivot members 63F, 64F 25 are rotated so that the relative angular position of the solids

og bevægelige svinglegemedele 63F,64F henholdsvis 63L,64Land movable pivot members 63F, 64F and 63L, 64L, respectively

på hver aksel 61,62 ændres i samme grad. Herved kan denon each shaft 61.62 changes to the same degree. Hereby it can

af hvert svinglegeme 63,64 (fast svinglegemedel 63F,64Fof each swing body 63.64 (solid swing body 63F, 64F

plus løsbar svinglegemedel 63L,64L) ved rotation frembragte 30 kraft ændres mellem en maksimal kraft, hvor den faste svinglegemedels 63F henholdsvis 64F og den løsbare sving-legemedels 63L henholdsvis 64L massemidtpunkt er sammenfaldende set i aksial retning og et minimum, hvor de ligger diametralt over for hinanden set i aksial retning Herved 35 vil i foreliggende udførelsesform, hvor de faste og de bevægelige svinglegemedele 63F,64F henholdsvis 63L,64L i hovedsagen er identiske og har samme masse, den vedplus soluble swing body 63L, 64L) upon rotation produced 30 changes between a maximum force where the solid swing body 63F and 64F, respectively, and the mass center of the removable swing body 63L and 64L, respectively, are in axial direction and a minimum where they are diametrically above axially facing each other Hereby, in the present embodiment, where the fixed and movable pivot members 63F, 64F and 63L, 64L respectively are substantially identical and have the same mass as the

Claims

A vibration compensator comprising two about one axis (35) pivotally mounted in a housing (51), shafts (61.62), each having a pivot body (63.64) with an eccentric relative to their axis of rotation (35). located center of mass and interconnected to rotate in opposite direction to each other with the same orbit in order to produce in one direction a resultant force component equal to zero and in a direction perpendicular thereto a resultant force component which harmonically varies between zero and twice the force (F 1) of each pivot body (63,64), characterized in that each pivot body (63, 64) comprises a first pivot body (63F, 64F) mounted on the shaft (61, 62) and a breath] swivel body (63L, 64L) mounted releasably on the shaft (61, 62) for a rotation relative to the first solid swing body (63F, 64F), the 35 swivel members all having eccentric proportions to turn. the center of mass of the shaft, and each shaft is provided with an axial bore (91, 92) and an associated radial bore (93, 94) which opens into the respective removable pivot body (63L, 64L) mounting surface (95, 96) of 4 8 DK 169848 B1 on the shaft (61, 62).

The oscillator compensator according to claim 1, characterized in that the two oscillation members (63F, 64F; 63L, 64L) are identical and have substantially the same mass. in

A pivot compensator according to claim 1 or 2, characterized in that each of the detachable pivot members (63L, 64L) has a radial hole (103, 104) arranged so that it can be aligned with a corresponding one in one. the wall (53) of the housing (51) formed radially hollow (101, 102). 15 20 25 30 '4 35 *