SE500179C2 - Däckbalanseringsgel och förfarande för balansering av fordonshjul - Google Patents

Däckbalanseringsgel och förfarande för balansering av fordonshjul

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Publication number
SE500179C2
SE500179C2 SE9003577A SE9003577A SE500179C2 SE 500179 C2 SE500179 C2 SE 500179C2 SE 9003577 A SE9003577 A SE 9003577A SE 9003577 A SE9003577 A SE 9003577A SE 500179 C2 SE500179 C2 SE 500179C2
Authority
SE
Sweden
Prior art keywords
balancing
gel
composition
tire
styrene
Prior art date
Application number
SE9003577A
Other languages
English (en)
Other versions
SE9003577D0 (sv
SE9003577L (sv
Inventor
Alvin Ronlan
Original Assignee
Alvin Ronlan
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alvin Ronlan filed Critical Alvin Ronlan
Priority to SE9003577A priority Critical patent/SE500179C2/sv
Publication of SE9003577D0 publication Critical patent/SE9003577D0/sv
Priority to US07/733,885 priority patent/US5431726A/en
Priority to AT91920112T priority patent/ATE142684T1/de
Priority to DK91920112.9T priority patent/DK0557365T3/da
Priority to ES91920112T priority patent/ES2091950T3/es
Priority to SG1996005502A priority patent/SG52524A1/en
Priority to EP91920112A priority patent/EP0557365B1/en
Priority to PCT/SE1991/000673 priority patent/WO1992008775A1/en
Priority to DE69122119T priority patent/DE69122119T2/de
Priority to BR919104740A priority patent/BR9104740A/pt
Publication of SE9003577L publication Critical patent/SE9003577L/sv
Publication of SE500179C2 publication Critical patent/SE500179C2/sv
Priority to US08/500,186 priority patent/US5540767A/en
Priority to GR960403389T priority patent/GR3021967T3/el

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    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C19/00Tyre parts or constructions not otherwise provided for
    • B60C19/003Balancing means attached to the tyre
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C5/00Inflatable pneumatic tyres or inner tubes
    • B60C5/004Inflatable pneumatic tyres or inner tubes filled at least partially with liquid
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Description

2 egenskaper och av vibrationstrycket (dvs amplituden och frekvensen hos vibrationsvågorna) och centrifugalkraften på kompositionen.
Storleken på vibrationstrycket förorsakat av obalans är stort sätt proportionell mot omfattningen (vikten) av obalansen och mot fordonets vikt (tryck på däcken) och hastighet, dvs Vibrationstrycket = Konstant x (Vikten på obalansen) x (Fordonets vikt) x (Fordonets hastighet) Det är viktigt att notera, att vibrationstrycket är oberoende av balanseringsgelens egenskaper och av däckets diameter.
Centrifugalkraften på en komposition placerad på ett däcks insida är proportionell mot kompositionens densitet och mot kvadraten på däckets rotationshastighet. Spänningen (stress) som centrifugalkraften förorsakar l en sådan komposition, i fall den är ojämnt fördelad, kan uppskattas med hjälp av följande ekvation: AP = [dXVZ/(izesxnjxu-ri) Där AP är tryckfallet (i Pascal) mellan de delar av den ojämnt fördelade kompositionen som befinner sig i respektive avstånd (i meter) r och ri från rotationsaxeln, d är kompositionens densitet (kg/m3), V är ett dimensionslöst tal lika med hjulets hastighet i kilometer per timme (KMH), r är differensen mellan däckets inre radie och tjockleken av balanseringsgelen på det tunnaste stället, och ri är avståndet frän rotationsaxeln till "toppen" av lagret av balanseringskomposition.
Den verkliga stressen i balanseringskompositionen avgörs av avståndet mellan den tunnaste och den tjockaste delen av kompositionen (balanseringskompositionens "|utning").
Den förskjutning i en balanseringskomposition som erfordras för att utjämna en viss obalans, avgörs av vikten och arten av obalansen och av däckets diameter.
Låt oss betrakta ett extremfall, ett standard 22 tums lastbilsdåck med 300 g statisk obalans i en "tung punkt". (300 g år den maximala obalansen som påträffas i praxis). För att utbalansera denna tunga punkt måste balanseringskompositionens lutande skikt innehålla 30Ox1r2/4 g massa, dvs 740 g. Bandet av balanseringskomposition på däckets insida är ca 10 cm brett. Antaget att balanseringskompositionens densitet är 900 kg/m3 och att Ti ,i “'í'7 n! QD s , Cr balanseringsskiktets tjocklek ökar lineärt från den tunga punkten till det tjockaste stället diametralt motsatt, går det att beräkna balanseringsskiktet till ungefär 3,3 mm på tjockaste stället, motsvarande en stress i balanseringskomposition på 14 Pa.
En liknande beräkning för ett standard 11 tums personbilsdäck med en statisk obalans på 90 g i en tung punkt (90 g är den maximala obalansen i praxis) antaget att balanseringsskiktets bredd är ca 7 cm, indikerar att balanseringsfilmen är ca 2,3 mm tjockare diametralt motsatt den tunga punkten, svarande till en stress på ungefär 19 Pa.
Med hjälp av dessa antagande och formeln ovan har jag fått fram nedanstående "Tabell |" för tryckfall och centrifugalkraftsinducerad stress i balanseringskompositionen.
K. f.
Tabell I Stress i en ojämnt fördelat balanseringskomposition förorsakat av centrifugalkraften i rullande däck av varierande diameter.
LASTBlL (UB) PERSONBIL (PB) LB PB LB PB d V r r. Obalans r r. Obalans AP AP Spân- Spän- ning ning kg/m3 km/h m m g m m g Pa Pa Pa Pa 900 120 0,5 0,501 92 0,3 0,301 38 2000 3333 1 4 900 120 0,5 0,502 183 0,3 0,302 77 4000 6667 5 14 900 120 0,5 0,503 275 0,3 0,303 116 6000 10000 11 32 900 120 0,5 0,504 367 0,3 0,304 154 8000 13333 20 57 900 120 0,5 0,505 459 0,3 0,305 193 10000 16667 32 88 900 120 0,5 0,506 550 0,3 0,306 231 12000 20000 46 127 1100 120 0,5 0,501 112 0,3 0,301 47 2444 4074 2 4 1100 120 0,5 0,502 224 0,3 0,302 95 4889 8148 6 17 1100 120 0,5 0,503 336 0,3 0,303 141 7333 12222 14 39 1100 120 0,5 0,504 448 0,3 0,304 188 9778 16296 25 69 1100 120 0,5 0,505 561 0,3 0,305 235 12222 20370 39 108 1100 120 0,5 0,506 673 0,3 0,306 283 14667 24444 56 156 Genom noggrann avstämning av gelkompositionens densitet och viskoelastiska egenskaper kan man åstadkomma perfekt, självjusterande balansering av fordonshjul genom att helt enkelt placera en sådan komposition inuti däcket (i slangdäck såväl som i slanglösa däck). Gelen introduceras genom däckets ventilkägla eller sprids jämnt med en spatel längs med däckets inre perimeter innan däcket monteras. Efter 2-10 km körning upphör alla vibrationer förorsakade av obalans. 503 "i 7 9 4 De viktigaste rheologiska egenskaperna hos balanseringskompositionen är dess elesticitetsmodul, G', och dess viskositetsmodul, G". G' är ett mått på gelstyrkan, dvs styrkan i och antalet av bindningar mellan molekylerna i gelbildaren. Jag har upptäckt, att för att uppnå tillfredsställande balanseringsegenskaper måste G' ligga i området 3000 - 15000 Pa.
Ett Strain Sweep för en fungerande balanseringsgel visas i Fig. 1. En synnerligen tillfredsställande balanseringskomposition har ett G'-värde kring 9000 Pa. En typisk skjuvspännings/viskositets - skjuvhastighetskurva för en välfungerande balanseringskomposition anges i Fig. 2. Nedre gränsen för G' hos en välfungerande balanseringskomposition har experimentellt bestämts till 3000 Pa.
Följande det teoretiska resonemanget ovan bör balanseringskompositionens densitet vara irrelevant. Till min förvåning har jag dock upptäckt, att balanseringskompositionens densitet är av stor betydelse. l praktiska försök fungerade geler med låg densitet (d < 900 kg/m3) baserade på olika kolväten konsekvent mycket bättre än geler med hög densitet (d >1000 kg/m3) baserade på olika förtjockade glykoler. Detta var speciellt fallet för personbilar och bussar, där försök med balansering med geler med hög densitet misslyckades oberoende av deras viskoelastiska egenskaper.
Av lika stor betydelse som densitet och viskoelastiska egenskaper är balanseringskompositionens långtidsstabilitet i bruk, balanseringskompositionens effektivitet vid olika temperaturer och balanseringskompositionens reaktivitet.
En acceptabel balanseringskomposition måste förbli funktionell under hela däckets livstid och under olika körbetingelser, speciellt måste den fungera i det normala körhastighetsintervallet, 0 till ca 160 kmh, och i det normala temperaturintervallet, -30°C till +90°C, idrift. Dessutom får balanseringskompositionen inte påverka däcket negativt, i synnerhet får balanseringskompositionen inte påverka däckets innerskikt eller skada däckkorden eller andra delar av däcket, som den kan komma i kontakt med vid olycksfall (i.e. punktering).
IVIININIUMKRAV PÅ EN FUNGERANDE BALANSERINGSGEL.
RHEOLOGI: 3000 Pa < Elasticitetsmodulen (G') < 15000 Pa.
Viskositetsmodulen (G") < G'. Kritisk skjuvspänning > 25 Pa.
Densitet < 950 kg/mß Flyktighet: Mindre än 6% (vikts) avdunstningsförlust efter 10 timmar vid +99°C.
U.. i CJ CJ '\ .M1 xO Flytpunkt för basoljan: < -15°C (ASTM D97) Löslighet: Olöslig i vatten, hydrofob.
Separationsstabilitet: Mindre än 1% separation (vikts) av basoljan efter 24 timmar vid 125 x g och 10000.
Kemisk reaktivitet: Ingen effekt på gummi eller andra polymerer, icke- korrosiv för metaller.
BESKRIVNING AV RITNINGARNA.
Fig. 1 visar plot av logaritmen av elasticitetsmodulen, G' (i Pa) som funktion av spänning (i m) för kompositionen i Exempel 1.
Fig. 2 visar plot av logaritmen av skjuvspänningen (i Pa) som funktion av skjuvhastigheten (i s'1) för kompositionen i Exempel 1. Vänstra ändpunkten för kurvan motsvarar den kritiska skjuvspänningen (174 Pa), dvs den skjuvspänning vid vilken gelnätet börjar bryta samman och viskositeten av kompositionen börjar sjunka.
Fig. 3 visar resultaten av en oscillationstest av kompositionen i Exempel 1.
DETALJERAD BESKRIVNING AV UPPFINNINGEN.
Baserat på ovannämnda kriterier och omfattande experiment och fältförsök har ett antal balanseringsgeler uppfunnits.
De uppfunna kompositionerna består av tre huvudkomponenter, en olja, en gelbildare och en viskositetindexförbättrare.
Exempel på oljor som är användbara för föreliggande uppfinning är paraffin- eller naften oljor med maximal densitet på 880 kg/m3 vid 25 °C och lägsta flytpunkt (ASTM D 97) vid maximalt -15 OC, polybuten oljor med maximal densitet på 900 kg/m3 vid 25 °C och lägsta flytpunkt (ASTM D 97) vid maximalt -15 °C Andra oljor som kan förväntas vara nyttiga för den föreliggande uppfinning är polyol estrar och andra syntetiska kolväten såsom polypropylen oljor och poly-alfa-olefiner .
Ett specifikt exempel på oljor som är användbar för den föreliggande uppfinning är en polybuten olja med kinematisk viskositet per ASTM D445 på cirka 50 cSt vid 99 OC, lägsta flytpunkt per ASTM D 97 vid -26 OC, densitet 868 kg/m3, och medelmolekylvikt 610, som finns tillgänglig från Amoco Chemicals Company, Chicago, Illinois, U.S.A., under handelsnamnet lndopol H-25.
Gelbildare som är användbar för den föreliggande uppfinning är kolloidal silikagel (hydrofob eller hydrofil), asbestfiber, bentonit lera och metalltvålar. f_- n n »J L' U 'i 7 9' 6 Specifika exempel på gelbildare som är användbar för den föreliggande uppfinning är en polydimetylsiloxan-behandlat, kolloidal silikagel med ett BET ytareal på 90 +/-20 m2/g som innehåller ca 5% kemiskt bundet kol, tillgänglig från Degussa under handelsnamnet Aerosil® R202, och kolloidal silikagel med ett BET ytareal på 200 +/-20 m2/g , tillgänglig från Cabot Corporation, U.S.A. under handelsnamnet Cab-O-Sil M-5.
Exempel på viskositetsindextörbättrare som är användbara för föreliggande uppfinning är poly-alkyl-metakrylat (PAMA), styren-etylen-butylen-styren block-copolymerer (SEBS), styren-etylen-propylen block-copolymerer (SEP), polyisobutylener, etylen-propylen copolymerer, hydrogenerade butadiene-styren-copolymerar, och polymerer av fumarsyra estra och maleinsyra estra.
Specifika exempel på viskositetindexförbättrare som är användbara för föreliggande uppfinning är en PAMA med medelmolekylvikt 480.000 tillgänglig frän Fiöhm GMBH Chemische Fabrik, Darmstadt, Germany under handelsnamnet Viscop|ex® 2-500, en SEP med ett styren/gummi förhållandet på 37/63, densitet 920 kg/m3, och sträckstyrka, psi på 300, tillgänglig från Shell Chemical Company, Houston, Texas, U.S.A., under handelsnamnet Kraton® G-1701X, och en poIyhydroxycarboxylsyraamidblandning tillgänglig från BYK-Chemie U.S.A., Connecticut, U.S.A under handelsnamnet BYK®-405 .
En komposition enligt föreliggande uppfinning består typisk av mellan cirka 80 och cirka 95 % (vikts) av oljan, mellan cirka 4 och cirka 15 % (vikts) av gelbildaren, och mellan cirka 1 och cirka 5 % (vikts) av viskositetsindexförbättraren.
Kompositionen kan även om så önskas innehålla mindre mängder korrosionsinhibitorer och/eller antioxidationsmedel.
Gelningseffekten på oljan hos gelbildaren åstadkommas genom bildning av ett nätverk av hydrogenbindningar via gelbildarens hydroxygrupper eller via van der Waals attraktion mellan molekylsegment i gelbildaren. Antalet av och styrkan i dessa bindningar avgör gelstyrkan och gelens förmåga att tåla belastning (kritisk skjuvspänning). l Figurerna 1-3 anges en fullständig rheologisk karakteristik av en fungerande balanseringsgel (Exempel 1). Vid belastning över den kritiska skjuvspànningen (starkt vibrationstryck förorsakad av obalans) bryter nätverket ihop och kompositionen börjar bete sig som en vätska.
En extensiv serie av kompositioner, som tillfredsställer ovannämnda rheologiska kriterier har framställts utifrån de typer av oljor och gelbildare, 7 EC' 7 9 som anges ovan. Inga av dessa kompositioner kunde dock tillfredsställa kraven på lángtidsstabilitet. Alla gelbildarna har högre densitet än oljorna, och under inverkan av centrifugalkraften i ett rullande däck uppstår efter ett tag separation. Denna separation förvärras ytterligare av den relativt höga driftstemperaturen i ett rullande däck (ända upp till 70°C), som leder till lägre viskositet hos oljan. Beroende på kravet på funktionalitet vid låga temperaturer (ned till -30°C) och pá effekten pá balanseringskompositionens elasticitet (den blir för hög) kan man inte använda högviskösa oljor. I den föreliggande uppfinning har jag upptäckt, att detta problem kan lösas genom tillsats av viskositetsförbättrande medel.
Exempel på kompositioner, som har studerats anges i Tabell ll.
Kompositionerna framställdes med kända metoder.
Kompositionerna utvärderades dels rheometrisk med hjälp av ett datoriserad Bohlin VOR Rheometer System (från Bohlin Rheologi AB, Lund) och dels i fälttester med personbilar, lastbilar och bussar. Personbilsdäcken försågs med 500 g balanseringsgel, antingen genom att gelen påfördes med en spatel på däckens insida innan montering på fälg eller genom injicering av gelen genom ventilkäglan. Buss och lastbilsdäck försågs med 1 kg balanseringsgel. Både slangdäck och slanglösa däck inkluderades i testen. Ingen skillnad i balanseringseffektivitet mellan de två typer av däck kunde observeras..
Kompositionemas effektivitet och livslängd utvärderades genom att mäta vibrationer från hjulen under en period av 50.000 km körning.
Kompositioner, som balanserade perfekt (inga kännbara vibrationer) under hela denna test och som utvisade mindre än 2% (vikts) separation av olja vid inspektion efter testets avslutning, bedömdes som godkända (funktionella). (_11 Cl) CD ._.\ N-q \!) TABELL II. Exempel på balanseringskompositioner Komponent %Vikt Ex. 1 L-100# H-15 Kraton® 1701X Viscoplex® 2-500 Aerosil® R202 9 Funktionell test God- känd 88.5 1.5 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex. 6 Ex. 7 Ex. 8 88.5 90.5 91 91.5 87 89 91 1.5 2 2 4 4 7 9.5 7.5 9 7 9 9 God- God- God- God- God- Unde Unde känd känd känd känd känd rkänd rkänd # Polybuten olja från Amoco, med kinematisk viskositet per ASTM D445 på omkring 220 cSt vid 38 OC, lägsta flytpunkt per ASTM D 97 vid -35 OC, densitet 850 kg/m3, och medelmolekylvikt 460. * Dessa kompositioner klarade inte stabilitetstesten, även om alla rheologiska kriterier är uppfyllda.

Claims (4)

10 15 20 25 30 35 \D (_) l C21 CJ ,. \ \\| \D PATENTKRAV.
1. En däckbalanseringsgel, som innehälls i luftkaviteten i ett fordonsdäck eller i en fordonsslang, k ä n n e t e c k n a d a v att den innehåller (a) 80 till 95% (vikts) av en olja eller en blandning av oljor, utvalda från klassen bestáendeav- i Polybuten olja med en maximal densitet på omkring 900 kg/m3 och maximal lägsta flytpunkt (ASTM D97) på mindre än +2 OC, (b) 4 till 15 % (vikts) av en gelbildare utvald från klassen bestående av kolloidal silikagel med en BET ytareal i omrâdet från omkring 50 till omkring 400 m2/g (c) 1 till 5% av en viskositetsindexförbättrare utvald från klassen bestående av (i) Poly-alkyl-metakrylater med en molekylvikt pà omkring 100.000 till omkring 900.000 (ii) styren-etylen-butylen-styren block-copolymerer och styren-etylen- propylen block -copolymerer med ett styren/gummi förhållandet på mellan omkring 13/87 och omkring 37/63 och balanseringsgelen har en elasticitetsmodul (G') på mellan 3000 Pa och 15000 Pa vid 2200, en viskositetsmodul (G") mindre än elasticitetsmodulen, en kritisk skjuvspänning som överstiger 25 Pa, densitet mindre än 950 kg/m3.
2. En komposition_som i Krav 1 i vilken elasticitetsmodulen vid 2200 är omkring 9500 Pa.
3. En komposition som i Krav 2 i vilken basoljan är en polybuten olja med kinematisk viskositet per ASTM D445 på mellan 1005 och 8910 SUS vid 38 OC, maximal lägsta flytpunkt (ASTM D97) på mellan -35 och -15 OC, densitet mellan 850 and 890 kg/m3, och medelmolekylvikt pà mellan 460 och 750; gelbildaren är en hydrofob, kolloidal silikagel med en BET ytareal på mellan 70 och 400 m2/g; och viskositetsindexförbättraren är en styren- etylen-propylen block-copolymer med ett styren/gummi förhållandet på omkring 37/63. (_31 C.) 10 15 20 25 30 35 CL) _-) \1 10
4. Ett förfarande för balansering av fordonshjul k ä n n e t e c k n a d a v att en balanseringskomposition enligt ett av kraven 1-3 appliceras på insidan av däcket eller insidan av slangen i däcket antingen direkt eller indirekt genom ventilkäglan, varefter hjulet monteras på fordonet, och fordonet körs en sträcka tillräcklig för att tillåta balanseringskompositionen utbalansera hjulet. ' " i
SE9003577A 1990-11-09 1990-11-09 Däckbalanseringsgel och förfarande för balansering av fordonshjul SE500179C2 (sv)

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SE9003577A SE500179C2 (sv) 1990-11-09 1990-11-09 Däckbalanseringsgel och förfarande för balansering av fordonshjul
US07/733,885 US5431726A (en) 1990-11-09 1991-08-01 Balancing composition
DE69122119T DE69122119T2 (de) 1990-11-09 1991-10-11 Zusammensetzung zum auswuchten von reifen
EP91920112A EP0557365B1 (en) 1990-11-09 1991-10-11 Tyre balancing composition
DK91920112.9T DK0557365T3 (da) 1990-11-09 1991-10-11 Dækbalanceringskomposition
ES91920112T ES2091950T3 (es) 1990-11-09 1991-10-11 Composicion para equilibrar neumaticos.
SG1996005502A SG52524A1 (en) 1990-11-09 1991-10-11 Tyre balancing composition
AT91920112T ATE142684T1 (de) 1990-11-09 1991-10-11 Zusammensetzung zum auswuchten von reifen
PCT/SE1991/000673 WO1992008775A1 (en) 1990-11-09 1991-10-11 Tyre balancing composition
BR919104740A BR9104740A (pt) 1990-11-09 1991-10-31 Composicao de gel balanceador e processo para balancear um conjunto de roda de veiculo a motor
US08/500,186 US5540767A (en) 1990-11-09 1995-07-10 Tire balancing composition and method of balancing a tire using the same
GR960403389T GR3021967T3 (en) 1990-11-09 1996-12-11 Tyre balancing composition

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US5540767A (en) 1996-07-30
EP0557365A1 (en) 1993-09-01
EP0557365B1 (en) 1996-09-11
SE9003577D0 (sv) 1990-11-09
DK0557365T3 (da) 1996-09-30
DE69122119T2 (de) 1997-01-30
DE69122119D1 (de) 1996-10-17
SE9003577L (sv) 1992-05-10
ATE142684T1 (de) 1996-09-15
BR9104740A (pt) 1992-06-23
US5431726A (en) 1995-07-11

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