Selection, Modification and Analysis of Suspension ... - IRD India

International Journal on Theoretical and Applied Research in Mechanical Engineering (IJTARME)2) Rear wishboneFig.5.Front WishboneInitially, the A-arm was considered for the rearsuspension. However, while the vehicle takes a turn, dueto the horizontal forces acting on the attachments of thewishbones and the knuckle and due to lack of steeringon the rear wheels, there may be toe-in or toe-out of thewheels. This may lead to improper steering and mayresult in unbalance. Excess toe-in may cause oversteerwhile turning leading to loss of control. Excess toe-outmay cause understeering while turning.To avoid anytoeing, the A-arm is converted into H-arm (as shown inFig.6). Thus the vertical pin knuckle-wishboneattachment is converted into horizontal pin attachment.This prevents formation of an axis and hence thepossibility of toeing of the wheels. This ensures properalignment and steering. It also increases the ride stabilityand linear travel.Fig.7.Front KnuckleDue to lack of funds the above design could not bemanufactured.The knuckle of a maruti 800 wasmodified so that it could accmmodate the designedwishbones.The modified design is shown below.Fig.8.Modified Front Knuckle2) Rear knuckleThe rear knuckle was designed to accommodate thedesigned H-arms (Fig.9)C. Design of knuckleFig.6.Rear WishboneA knuckle is used to connect the wishbones to thewheel hub.1) Front knuckleThe first step in the design was market research. Astandard knuckle of MARUTI SUZUKI ESTEEM wasselected from the market and studied. The suspensionsystem of the Esteem is MacPherson type, hence theknuckle had to be modified. The designed knuckle isshown. (Fig.7)Fig.9.Rear Knuckle65ISSN : 2319 – 3182, Volume-2, Issue-4, 2013