Knowledge

Anti-roll bar

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113: 101: 121: 27: 1795: 1052: 1785: 1042: 291: 145: 322:'s original patent, the anti-roll bar forms an integral and essential part of the suspension, in addition to its usual function in controlling body roll. A strut suspension like MacPherson's requires a hinged lower member between the chassis and wheel hub to control the wheel position both inwards and outwards (controlling the track), and also forwards and backwards. This may be provided by a 306:. This allows the stiffness to be altered, for example by increasing or reducing the length of the lever arms on some systems, or by rotating a flat lever arm from a stiff edge-on position to a more flexible flat-side-on position on other systems. This lets a mechanic tune the roll stiffness for different situations without replacing the entire bar. 354:
Cyborg. The 16-valve turbo model's "Dual Mode Suspension" has a dashboard- operated hydraulic actuator built into the front anti-roll bar link, allowing it to toggle between sport and touring modes. The Jeep Wrangler (JK, JL) and Jeep Gladiator (JT) also have a switchable decoupler on Rubicon models,
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Because an anti-roll bar connects wheels on opposite sides of the vehicle, the bar transmits the force of a bump on one wheel to the opposite wheel. On rough or broken pavement, anti-roll bars can produce jarring, side-to-side body motions (a "waddling" sensation), which increase in severity with the
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An anti-roll bar is usually a torsion spring anchored to resist body roll motions. It is usually constructed out of a cylindrical steel bar, formed into a "U" shape, that connects to the body at two points along its longer center section, and on each end. When the left and right wheels move together
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can be reduced by changing the proportion of the total roll stiffness that comes from the front and rear axles. Increasing it at the front increases the proportion of the total load transfer that the front axle reacts toā€”and decreases it in the rear. In general, this makes the outer front wheel run
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The bar resists the torsion through its stiffness. The stiffness of an anti-roll bar is proportional to the stiffness of the material, the fourth power of its radius, and the inverse of the length of the lever arms (i.e., the shorter the lever arm, the stiffer the bar). Stiffness is also related to
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Excessive roll stiffness, typically achieved by configuring an anti-roll bar too aggressively, can make the inside wheels lift off the ground during hard cornering. This can be used to advantage: many front wheel drive production cars lift a rear wheel when cornering hard in order to overload the
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Anti-roll bars provide two main functions. The first is to reduce body lean. This is dependent on the total roll stiffness of the vehicle. Increasing this stiffness does not change the steady state total load (weight) transfer from the inside wheels to the outside, it only reduces body lean. The
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As the anti-roll bar is required to control wheel position, the bars of a MacPherson strut suspension may be connected through ball joints. However many later "MacPherson strut" suspensions have reverted to using wishbones rather than the simplified track control arm of the original design.
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An anti-sway or anti-roll bar is intended to reduce the lateral tilt (roll) of the vehicle on curves, sharp corners, or large bumps. Although there are many variations in design, the object is to induce a vehicle's body to remain as level as possible by forcing the opposite wheel's
221:(CG), proportional to lateral acceleration. Because the CG is usually not on the roll axis, the lateral force creates a moment about the roll axis that tends to roll the body. (The roll axis is a line that joins the front and rear roll centers). The moment is called the 91:
Anti-roll bars were unusual on pre-WW2 cars due to the generally much stiffer suspension and acceptance of body roll. From the 1950s on, however, production cars were more commonly fitted with anti-roll bars, especially those vehicles with softer coil spring suspension.
34:, which traverses the underside of the car. Flexible bushings attach it to the chassis. Also visible on the right is one of the links that connect the bar to the suspension (drop link). These twist the anti-roll bar when the vehicle is cornering, resisting body roll. 210:
the geometry of the mounting points and the rigidity of the bar's mounting points. The stiffer the bar, the more force required to move the left and right wheels relative to each other. This increases the amount of force required to make the body roll.
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of the vehicle's springs and of the anti-roll bars, if any. The use of anti-roll bars allows designers to reduce roll without making the suspension's springs stiffer in the vertical plane, which allows improved body control with less compromise of
334:, with a single inboard joint, to control the track. Forward and backward position was controlled through the anti-roll bar. Overall this required a simpler and cheaper set of suspension members than with wishbones, also allowing a reduction in 265:
at a comparatively higher slip angle, and the outer rear wheel to run at a comparatively lower slip angle, increasing understeer. Increasing the proportion of roll stiffness at the rear axle has the opposite effect, decreasing understeer.
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In a turn a vehicle compresses its outer wheel's suspension. The anti-roll bar forces the opposite wheel's to also compress, thereby keeping the body in a more level lateral attitude. This has the additional benefit of lowering its
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system eliminates the anti-roll bar, instead using sensors to detect lateral load, lateral force, and height difference in the suspension strut, which then hydraulically raise or lower the spring to counter roll.
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through a flexible joint. The link is connected in turn to a spot near a wheel or axle, transferring forces from the heavily loaded side of a suspension to the opposite.
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When both front and rear anti-roll bars are fitted, their combined effect can help maintain a vehicle's tendency to roll towards the general slope of the terrain.
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Anti-roll bar (in red) attached to a front axle. The bar must also have its two longitudinal anchor points fastened solidly to transfer forces from side to side.
473: 302:, are externally adjustable while the car is in the pit, whereas some systems can be adjusted in real time by the driver from inside the car, such as in 1371: 611: 1088: 350:
Various methods of decoupling the anti-roll bar have been proposed. The first production car to use a semi-active anti-roll bar was the 1988
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of the wheels on the outside of the turn and negative on the inside, which reduces their cornering grip (especially with cross ply tires).
112: 1824: 582: 519: 405:(KDSS) that essentially disengages the stabilizer bars when off-road, allowing for greater vehicle articulation and ride quality. 274:
diameter and stiffness of the anti-roll bars. Other suspension techniques can delay or dampen this effect of the connecting bar.
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Two front-wheel springs, with the wheels removed. Opposite suspension arms are connected to the central anti-roll bar assembly.
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of a vehicle during fast cornering or over road irregularities. It links opposite front or rear wheels to a
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the bar simply rotates on its central mounting points. When the wheels move relative to each other,
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is a common form of strut suspension. This was not the first attempt at strut suspension, but in
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total lateral load transfer is determined by the center of gravity height and track width.
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Roll couple is resisted by the suspension roll stiffness, which is a function of the
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The first stabilizer bar patent was awarded to Canadian inventor Stephen Coleman of
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The other function of anti-roll bars is to tune the handling balance of a car.
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One effect of body lean, for typical unibody suspension geometry, is positive
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K=Fractional lever arm ratio (movement at roll bar / movement at wheel)
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to the connected end link on the opposite side of the vehicle
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Some anti-roll bars, particularly those intended for use in
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during hard cornering, minimizing body roll to 2 degrees.
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of the vehicle's body produces a lateral force at the
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to the anti-sway (torsion) bar via a flexible joint
77:arms for anchors. This increases the suspension's 355:to increase wheel articulation for off-roading. 294:Diagram of two types of adjustable antiroll bars. 1811: 520:"Anti-roll bar link: function, failure symptoms" 498:(Fourth ed.). G.T. Foulis & Co. 1983. 193:from the heavily loaded side of the suspension 148:One way of estimating antiroll bar stiffness: 23:Device that reduces the body roll of a vehicle 1365: 1082: 649: 466:"Patent Summary: CA 189894 Spring suspension" 345: 30:An anti-roll bar (in black) on the rear of a 369:The first active anti-roll bar system was 81:stiffnessā€”its resistance to roll in turns. 1379: 1372: 1358: 1089: 1075: 656: 642: 493: 464:Coleman, Stephen L. Chancey (1919-04-22). 438: 141:during a turn, increasing its stability. 289: 143: 119: 111: 99: 95: 25: 1096: 463: 205:to the opposite side of the suspension. 196:to the connected end link via a bushing 182:Each end of the bar is connected to an 1812: 1353: 1070: 637: 470:Canadian Intellectual Property Office 457: 401:also uses a mechanical system called 441:Great Maritime Inventions, 1833-1950 309: 443:. Goose Lane Editions. p. 69. 13: 1825:Automotive suspension technologies 1667:Electronic brakeforce distribution 772:Continuously variable transmission 285: 189:Forces are therefore transferred: 14: 1851: 629: 403:Kinetic Dynamic Suspension System 358: 247: 1794: 1793: 1783: 1051: 1050: 1040: 156:R=Effective arm length (inches) 614:from the original on 2018-09-29 585:from the original on 2024-01-17 556:from the original on 2017-12-12 476:from the original on 2017-10-23 162:Q=Stiffness (lb*in per degree) 160:S=Length of lever arm (inches) 150:T=Vehicle track width (inches) 663: 596: 567: 536: 512: 496:Race and Rally Car Source Book 487: 432: 158:L=Half length of bar (inches) 1: 807:Automated manual transmission 425: 169: 18:Rollover protection structure 1672:Electronic stability control 1130:Electronic Stability Control 545:Vehicle Dynamics Terminology 268: 7: 1830:Vehicle safety technologies 1559:Ackermann steering geometry 882:Semi-automatic transmission 604:"CitroĆ«n hydraulics Xantia" 408: 65:part that helps reduce the 10: 1856: 1622:Active rollover protection 719:Internal combustion engine 494:Staniforth, Allan (2001). 362: 346:Semi active anti-roll bars 86:Fredericton, New Brunswick 15: 1779: 1715: 1602: 1549: 1401: 1388: 1274: 1258: 1237: 1227: 1193: 1102: 1036: 1018:Hybrid vehicle drivetrain 1005: 920: 907:Transmission control unit 847:Limited-slip differential 812:Electrorheological clutch 737: 684: 671: 439:Theriault, Mario (2001). 278:opposite wheel, limiting 1840:Mechanical power control 1617:Anti-lock braking system 1411:Anti-roll bar (sway bar) 797:Dual-clutch transmission 179:cause the bar to twist. 154:d=Bar diameter (inches) 16:Not to be confused with 1647:Combined braking system 767:Constant-velocity joint 1471:Independent suspension 747:Automatic transmission 420:Torsion bar suspension 295: 163: 125: 117: 109: 35: 1491:Multi-link suspension 389:Mercedes-Benz S-Class 293: 147: 123: 115: 103: 96:Purpose and operation 29: 852:Locking differential 787:Direct-shift gearbox 1820:Canadian inventions 1662:Electric park brake 1097:Automotive handling 877:Preselector gearbox 857:Manual transmission 392:Active Body Control 88:on April 22, 1919. 1702:Regenerative brake 1023:Electric generator 928:Wheel hub assembly 552:. 2008. SAEJ670e. 296: 164: 126: 118: 110: 36: 1807: 1806: 1612:Automatic braking 1347: 1346: 1343: 1342: 1336: 1333:Semi-trailing arm 1309: 1292: 1064: 1063: 817:Epicyclic gearing 686:Automotive engine 450:978-0-86492-324-0 365:Active suspension 352:Mitsubishi Mirage 332:track control arm 310:MacPherson struts 219:centre of gravity 139:center of gravity 1847: 1797: 1796: 1787: 1751:Outline of tires 1486:MacPherson strut 1374: 1367: 1360: 1351: 1350: 1330: 1303: 1301:MacPherson strut 1286: 1259:Semi-independent 1235: 1234: 1180:Vehicle dynamics 1091: 1084: 1077: 1068: 1067: 1054: 1053: 1044: 921:Wheels and tires 892:Torque converter 658: 651: 644: 635: 634: 623: 622: 620: 619: 600: 594: 593: 591: 590: 575:"30å¹“å‰ć®ć€Œć‚Øćƒ“ćƒ•ćƒ©ć‚¤å®šé£Ÿć€" 571: 565: 564: 562: 561: 540: 534: 533: 531: 530: 516: 510: 509: 491: 485: 484: 482: 481: 461: 455: 454: 436: 316:MacPherson strut 1855: 1854: 1850: 1849: 1848: 1846: 1845: 1844: 1810: 1809: 1808: 1803: 1775: 1724: 1720: 1711: 1687:Hydraulic fluid 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wheel 1754: 1752: 1749: 1747: 1744: 1742: 1739: 1737: 1734: 1732: 1729: 1728: 1726: 1723: 1722:Tires (Tyres) 1719: 1714: 1708: 1705: 1703: 1700: 1698: 1697:Parking brake 1695: 1693: 1692:Inboard brake 1690: 1688: 1685: 1683: 1680: 1678: 1675: 1673: 1670: 1668: 1665: 1663: 1660: 1658: 1655: 1653: 1650: 1648: 1645: 1643: 1640: 1638: 1635: 1633: 1630: 1628: 1625: 1623: 1620: 1618: 1615: 1613: 1610: 1609: 1607: 1605: 1601: 1595: 1592: 1590: 1587: 1585: 1582: 1580: 1577: 1575: 1572: 1570: 1567: 1565: 1562: 1560: 1557: 1556: 1554: 1552: 1548: 1542: 1539: 1537: 1534: 1532: 1529: 1527: 1526:Unsprung mass 1524: 1522: 1519: 1517: 1514: 1512: 1509: 1507: 1504: 1502: 1499: 1497: 1494: 1492: 1489: 1487: 1484: 1482: 1479: 1477: 1474: 1472: 1469: 1467: 1464: 1461: 1457: 1454: 1452: 1449: 1447: 1444: 1442: 1439: 1437: 1434: 1432: 1429: 1427: 1424: 1422: 1419: 1417: 1414: 1412: 1409: 1408: 1406: 1404: 1400: 1396: 1394: 1387: 1382: 1375: 1370: 1368: 1363: 1361: 1356: 1355: 1352: 1334: 1329: 1326: 1324: 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Retrieved 459: 440: 434: 397: 386: 368: 349: 340: 313: 297: 276: 272: 255: 251: 239: 235:ride quality 227: 212: 208: 188: 183: 181: 173: 165: 135: 127: 90: 83: 73:using short 55: 51: 47: 43: 39: 37: 1771:Wire wheels 1741:Drive wheel 1731:Alloy wheel 1637:Brake fluid 1516:Torsion bar 1496:Panhard rod 1476:Leaf spring 1456:Hydrolastic 1441:Coil spring 1276:Independent 1160:Tire / Tyre 1135:Fishtailing 1103:Main topics 943:Alloy wheel 802:Drive wheel 792:Drive shaft 752:Chain drive 415:Panhard rod 300:auto racing 230:spring rate 223:roll couple 215:sprung mass 1835:Auto parts 1814:Categories 1718:Roadwheels 1657:Drum brake 1652:Disc brake 1632:Brake fade 1594:Understeer 1506:Swing axle 1421:Axle track 1403:Suspension 1393:Automobile 1323:Swing axle 1313:Multi-link 1289:Jaguar IRS 1266:Twist beam 1229:Suspension 1170:Understeer 1155:Suspension 1028:Alternator 676:Automobile 665:Powertrain 618:2017-06-27 589:2019-02-14 560:2017-12-14 529:2024-09-25 480:2014-08-21 426:References 363:See also: 328:radius rod 320:MacPherson 280:understeer 258:Understeer 170:Principles 63:suspension 60:automobile 1574:Oversteer 1541:Wheelbase 1511:Toe angle 1481:Live axle 1426:Beam axle 1245:Beam axle 1238:Dependent 1214:Pneumatic 1165:Transaxle 1145:Oversteer 1120:Downforce 897:Transaxle 862:Manumatic 832:Gearshift 704:Fuel cell 608:Citroenet 269:Drawbacks 262:oversteer 67:body roll 1799:Category 1551:Steering 1460:Hydragas 1296:Dubonnet 1150:Steering 1125:Drifting 1056:Category 995:Tubeless 980:Run-flat 960:Off-road 777:Coupling 699:Electric 612:Archived 583:Archived 554:Archived 474:Archived 409:See also 324:wishbone 304:Super GT 184:end link 58:) is an 52:sway bar 44:roll bar 1761:Spinner 1569:Kingpin 1381:Chassis 1219:Torsion 524:Autodoc 371:CitroĆ«n 32:Porsche 1789:Portal 1746:Hubcap 1604:Brakes 1395:series 1195:Spring 1046:Portal 1006:Hybrid 970:Radial 948:Hubcap 762:Clutch 709:Hybrid 678:series 610:. UK. 502:  447:  399:Toyota 378:Activa 375:Xantia 242:camber 1231:types 1197:types 990:Spare 933:Wheel 837:Giubo 75:lever 1416:Axle 1209:Leaf 1204:Coil 985:Snow 975:Rain 955:Tire 579:ćæć‚“ć‚«ćƒ© 500:ISBN 445:ISBN 387:The 314:The 79:roll 938:Rim 550:SAE 382:ECU 260:or 106:SUV 104:An 38:An 1816:: 606:. 581:. 577:. 548:. 522:. 472:. 468:. 338:. 282:. 237:. 225:. 54:, 50:, 46:, 1462:) 1458:( 1373:e 1366:t 1359:v 1335:) 1331:( 1308:) 1304:( 1291:) 1287:( 1090:e 1083:t 1076:v 715:) 711:( 657:e 650:t 643:v 621:. 592:. 563:. 532:. 508:. 483:. 453:. 42:( 20:.

Index

Rollover protection structure

Porsche
automobile
suspension
body roll
torsion spring
lever
roll
Fredericton, New Brunswick

SUV


shock absorber
center of gravity

torsion forces
sprung mass
centre of gravity
roll couple
spring rate
ride quality
camber
Understeer
oversteer
understeer

auto racing
Super GT

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