In general, the compression and extension characteristics of the shock absorber must match the compression and extension characteristics of the spring. This is why shock/strut manufacturers are adamant about the regular inspection and replacement of worn units. In addition, tire wear will be accelerated due to tire scuff caused by the suspension geometry operating out of its normal range. In this example, if springs are installed between the chassis and axles, the sprung-to-unsprung ratio might be 90% representing the chassis weight and 10% representing the axle and wheel weight.Īs rebound control deteriorates due to normal shock absorber wear, the vehicle will begin to experience poor ride, steering response and handling control. A farm wagon with no springs represents 100% unsprung weight. Springs cushion the ride of a vehicle according to the principle of sprung-to-unsprung weight ratios.
Variable rate coil springs are often used in chassis configurations that occasionally carry heavy loads. In some cases, a coil spring can be designed as a variable rate spring that increases load-bearing capability as it’s compressed. In general, wire gauge, length, overall diameter and numbers of coils determine the characteristics of the coil spring. Most modern imports use the coil spring in variations of the MacPherson strut design. Since a coil spring occupies a relatively small space, it can be used in a variety of suspension designs including MacPherson strut, solid axle with trailing arms, independently sprung rear axle, or any SLA suspension system using a spring or coil-over shock absorber configuration. Because the coiled wire twists during the spring’s compression/extension cycles, the coil spring actually operates on the same principle as a torsion bar. The function of a coil spring can be better understood if we visualize it as a long, thin, torsion bar wound into a coil shape. In addition, torsion bars can be attached to either the upper or lower control arms, increasing the versatility of the design. Since the torsion bar tension is controlled by a threaded screw adjustment, torsion bars can be used to fine-tune suspension height. Tufoil 32 oz.The advantages of the torsion bar suspension system include compactness and light weight. Engine Oil Treatment - The World's Most Efficient Lubricant
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