Anti dive and anti squat pdf files

Now draw a line straight down from the vehicles center of gravity. Locate the front centers of the suspension from the vehicles side view. The simplistic suspension design that was built and used on the current frame did not give any consideration to longitudinal loads, only transverse loads created by cornering. Anti squat, anti dive and anti lift geometry which will be referred to as anti geometry when discussing them as a whole is a form of geometry at the front and rear wheels that alters and controls the amount that a car will compress the springs due to acceleration, deceleration or braking conditions. An attempt is being made in this paper to highlight the effect of suspension geometry on all these three metrics. The basics of antisquat, antidive, and roll center. Intuitive explanation of anti squat with real demos and examples. Discussion paper effect of antisquat adjustment in solid. Keywords roll centre characteristics, anti dive and anti squat characteristics, wishbone configuration, weight transfer, ansys, stress and factor of safety. The typical case for this is under braking, but there is another case that can alter the loads. Anti squat, dive and lift geometry geometry explained. When a car is decelerating due to braking there is a load transfer off the rear wheels and onto the front wheels proportional to the center of gravity height, the deceleration rate and inversely proportional to the wheelbase. A higher center of gravity means more weight is transferred during acceleration off the corners. The lower number range is for the drag racers as they wish to promote weight transfer to improve traction and of tyres for improved acceleration and deacceleration whereas upper limit is for the common passenger car and loading vehicles as nobody wants to drive a car which would go 5 inches down on applying brakes especially in traffic region.

Antisquat suspensions are used to reduce body squat by altering the rear suspension so that the forces resulting from accelerating pass through the control arms. Draw a line from the tire contact patch through the instant center. If the car squats during acceleration, the rear becomes lower, and the overall center of. Antidive is a suspension parameter that affects the amount of suspension deflection when the brakes are applied.

Front kick up under rear block notches 0 1 2 0 9 8. Usually, 050% of antidive and antisquat is provided in modern cars. When building a 4link suspension, the lengths of the links, their positioning, and the angles at which they are mounted, will all determine how the suspension affects the vehicle chassis under acceleration, braking, and cornering. Over 100% of anti squat as means suspension will extend under acceleration. Anti dive has an effect when there is a torque trying to rotate the spindle relative to the chassis. Volume 1 suspension optimization of student formula race car. The anti dive is the ratio between the height of where the tire force vector crosses the center of gravity plane expressed as a percentage. Hence, suspension geometry plays a major role in rollover, squat and dive of any vehicle. Pdf influence of antidive and antisquat geometry in. In fase di frenata si genera un trasferimento di carico tra gli assi. Anti squat anti dive profile view, through centerline of chassis, solid lines indicate control arms, dashed lines show instant centers. Squat is a term used to refer to the amount the car tips backwards under acceleration. Antidive and antisquat percentage are always calculated with respect to a vertical plane that intersects the vehicles center of gravity. The method presented here graphical method for anti squat is not valid in.