Knowledge (XXG)

Anti-roll bar

Source šŸ“

124: 112: 132: 38: 1770: 1027: 1760: 1017: 333:'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 302: 156: 317:. 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. 365:
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
232:(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 102:
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.
45:, 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. 221:
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
345:, 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 276:
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.
1063: 1799: 472: 313:, 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 586: 1339: 468: 361:
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).
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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
70: 384:'s SC.CAR (Systeme Citroƫn de ContrƓle Actif du Roulis), debuted in its 1994 144:, spring, or suspension rod in the same direction as the one being impacted. 1515: 1455: 1400: 1219: 1139: 1094: 959: 949: 871: 836: 272: 119:, with anti roll bars removed, shows how much the body can roll without them 89: 77: 301: 155: 1525: 1324: 1124: 751: 314: 518: 163:
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
88:arms for anchors. This increases the suspension's 366:to increase wheel articulation for off-roading. 305:Diagram of two types of adjustable antiroll bars. 497:(Fourth ed.). G.T. Foulis & Co. 1983. 204:from the heavily loaded side of the suspension 159:One way of estimating antiroll bar stiffness: 34:Device that reduces the body roll of a vehicle 1340: 1057: 624: 465:"Patent Summary: CA 189894 Spring suspension" 41:An anti-roll bar (in black) on the rear of a 8: 380:The first active anti-roll bar system was 92:stiffnessā€”its resistance to roll in turns. 1347: 1333: 1325: 1209: 1064: 1050: 1042: 631: 617: 609: 463:Coleman, Stephen L. Chancey (1919-04-22). 152:during a turn, increasing its stability. 442: 216:to the opposite side of the suspension. 207:to the connected end link via a bushing 193:Each end of the bar is connected to an 469:Canadian Intellectual Property Office 412:also uses a mechanical system called 7: 451:Great Maritime Inventions 1833-1950 1800:Automotive suspension technologies 1642:Electronic brakeforce distribution 747:Continuously variable transmission 453:, Goose Lane Editions, 2001, p. 69 200:Forces are therefore transferred: 25: 414:Kinetic Dynamic Suspension System 1769: 1768: 1758: 1026: 1025: 1015: 167:R=Effective arm length (inches) 589:from the original on 2018-09-29 560:from the original on 2024-01-17 531:from the original on 2017-12-12 475:from the original on 2017-10-23 173:Q=Stiffness (lb*in per degree) 171:S=Length of lever arm (inches) 161:T=Vehicle track width (inches) 495:Race and Rally Car Source Book 169:L=Half length of bar (inches) 1: 782:Automated manual transmission 29:Rollover protection structure 1647:Electronic stability control 1105:Electronic Stability Control 520:Vehicle Dynamics Terminology 1805:Vehicle safety technologies 1534:Ackermann steering geometry 857:Semi-automatic transmission 579:"CitroĆ«n hydraulics Xantia" 76:part that helps reduce the 1831: 1597:Active rollover protection 694:Internal combustion engine 493:Staniforth, Allan (2001). 373: 357:Semi active anti-roll bars 97:Fredericton, New Brunswick 26: 1754: 1363: 1011: 993:Hybrid vehicle drivetrain 882:Transmission control unit 822:Limited-slip differential 787:Electrorheological clutch 646: 289:opposite wheel, limiting 1815:Mechanical power control 1592:Anti-lock braking system 1386:Anti-roll bar (sway bar) 772:Dual-clutch transmission 190:cause the bar to twist. 165:d=Bar diameter (inches) 27:Not to be confused with 1622:Combined braking system 742:Constant-velocity joint 1446:Independent suspension 722:Automatic transmission 431:Torsion bar suspension 306: 174: 136: 128: 120: 46: 1466:Multi-link suspension 400:Mercedes-Benz S-Class 304: 158: 134: 126: 114: 107:Purpose and operation 40: 827:Locking differential 762:Direct-shift gearbox 18:Active anti-roll bar 1795:Canadian inventions 1637:Electric park brake 1072:Automotive handling 852:Preselector gearbox 832:Manual transmission 403:Active Body Control 99:on April 22, 1919. 1677:Regenerative brake 998:Electric generator 903:Wheel hub assembly 527:. 2008. SAEJ670e. 307: 175: 137: 129: 121: 47: 1782: 1781: 1587:Automatic braking 1322: 1321: 1318: 1317: 1311: 1308:Semi-trailing arm 1284: 1267: 1039: 1038: 792:Epicyclic gearing 661:Automotive engine 449:Mario Theriault, 376:Active suspension 363:Mitsubishi Mirage 343:track control arm 321:MacPherson struts 230:centre of gravity 150:center of gravity 16:(Redirected from 1822: 1772: 1771: 1762: 1726:Outline of tires 1461:MacPherson strut 1349: 1342: 1335: 1326: 1305: 1278: 1276:MacPherson strut 1261: 1234:Semi-independent 1210: 1155:Vehicle dynamics 1066: 1059: 1052: 1043: 1029: 1028: 1019: 896:Wheels and tires 867:Torque converter 633: 626: 619: 610: 598: 597: 595: 594: 575: 569: 568: 566: 565: 550:"30å¹“å‰ć®ć€Œć‚Øćƒ“ćƒ•ćƒ©ć‚¤å®šé£Ÿć€" 546: 540: 539: 537: 536: 515: 509: 508: 490: 484: 483: 481: 480: 460: 454: 447: 327:MacPherson strut 21: 1830: 1829: 1825: 1824: 1823: 1821: 1820: 1819: 1785: 1784: 1783: 1778: 1750: 1699: 1695: 1686: 1662:Hydraulic fluid 1657:Hydraulic brake 1573: 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wheel 1729: 1727: 1724: 1722: 1719: 1717: 1714: 1712: 1709: 1707: 1704: 1703: 1701: 1698: 1697:Tires (Tyres) 1694: 1689: 1683: 1680: 1678: 1675: 1673: 1672:Parking brake 1670: 1668: 1667:Inboard brake 1665: 1663: 1660: 1658: 1655: 1653: 1650: 1648: 1645: 1643: 1640: 1638: 1635: 1633: 1630: 1628: 1625: 1623: 1620: 1618: 1615: 1613: 1610: 1608: 1605: 1603: 1600: 1598: 1595: 1593: 1590: 1588: 1585: 1584: 1582: 1580: 1576: 1570: 1567: 1565: 1562: 1560: 1557: 1555: 1552: 1550: 1547: 1545: 1542: 1540: 1537: 1535: 1532: 1531: 1529: 1527: 1523: 1517: 1514: 1512: 1509: 1507: 1504: 1502: 1501:Unsprung mass 1499: 1497: 1494: 1492: 1489: 1487: 1484: 1482: 1479: 1477: 1474: 1472: 1469: 1467: 1464: 1462: 1459: 1457: 1454: 1452: 1449: 1447: 1444: 1442: 1439: 1436: 1432: 1429: 1427: 1424: 1422: 1419: 1417: 1414: 1412: 1409: 1407: 1404: 1402: 1399: 1397: 1394: 1392: 1389: 1387: 1384: 1383: 1381: 1379: 1375: 1371: 1369: 1362: 1357: 1350: 1345: 1343: 1338: 1336: 1331: 1330: 1327: 1309: 1304: 1301: 1299: 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Retrieved 582: 573: 562:. Retrieved 553: 544: 533:. Retrieved 519: 513: 494: 488: 477:. Retrieved 458: 450: 445: 408: 397: 379: 360: 351: 324: 308: 287: 283: 266: 262: 250: 246:ride quality 238: 223: 219: 199: 194: 192: 184: 176: 146: 138: 101: 94: 84:using short 66: 62: 58: 54: 50: 48: 1746:Wire wheels 1716:Drive wheel 1706:Alloy wheel 1612:Brake fluid 1491:Torsion bar 1471:Panhard rod 1451:Leaf spring 1431:Hydrolastic 1416:Coil spring 1251:Independent 1135:Tire / Tyre 1110:Fishtailing 1078:Main topics 918:Alloy wheel 777:Drive wheel 767:Drive shaft 727:Chain drive 426:Panhard rod 311:auto racing 241:spring rate 234:roll couple 226:sprung mass 1810:Auto parts 1789:Categories 1693:Roadwheels 1632:Drum brake 1627:Disc brake 1607:Brake fade 1569:Understeer 1481:Swing axle 1396:Axle track 1378:Suspension 1368:Automobile 1298:Swing axle 1288:Multi-link 1264:Jaguar IRS 1241:Twist beam 1204:Suspension 1145:Understeer 1130:Suspension 1003:Alternator 651:Automobile 640:Powertrain 593:2017-06-27 564:2019-02-14 535:2017-12-14 479:2014-08-21 437:References 374:See also: 339:radius rod 331:MacPherson 291:understeer 269:Understeer 181:Principles 74:suspension 71:automobile 1549:Oversteer 1516:Wheelbase 1486:Toe angle 1456:Live axle 1401:Beam axle 1220:Beam axle 1213:Dependent 1189:Pneumatic 1140:Transaxle 1120:Oversteer 1095:Downforce 872:Transaxle 837:Manumatic 807:Gearshift 679:Fuel cell 583:Citroenet 280:Drawbacks 273:oversteer 78:body roll 1774:Category 1526:Steering 1435:Hydragas 1271:Dubonnet 1125:Steering 1100:Drifting 1031:Category 970:Tubeless 955:Run-flat 935:Off-road 752:Coupling 674:Electric 587:Archived 558:Archived 529:Archived 473:Archived 420:See also 335:wishbone 315:Super GT 195:end link 69:) is an 63:sway bar 55:roll bar 1736:Spinner 1544:Kingpin 1356:Chassis 1194:Torsion 382:CitroĆ«n 43:Porsche 1764:Portal 1721:Hubcap 1579:Brakes 1370:series 1170:Spring 1021:Portal 981:Hybrid 945:Radial 923:Hubcap 737:Clutch 684:Hybrid 653:series 585:. UK. 501:  410:Toyota 389:Activa 386:Xantia 253:camber 1206:types 1172:types 965:Spare 908:Wheel 812:Giubo 86:lever 1391:Axle 1184:Leaf 1179:Coil 960:Snow 950:Rain 930:Tire 554:ćæć‚“ć‚«ćƒ© 499:ISBN 398:The 325:The 90:roll 913:Rim 525:SAE 393:ECU 271:or 117:SUV 115:An 49:An 1791:: 581:. 556:. 552:. 523:. 471:. 467:. 349:. 293:. 248:. 236:. 65:, 61:, 57:, 1437:) 1433:( 1348:e 1341:t 1334:v 1310:) 1306:( 1283:) 1279:( 1266:) 1262:( 1065:e 1058:t 1051:v 690:) 686:( 632:e 625:t 618:v 596:. 567:. 538:. 507:. 482:. 53:( 31:. 20:)

Index

Active anti-roll bar
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

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