Design of a Multilink Independent Front Suspension for Class A Motor Homes

Motorized recreational vehicles with front axle load ratings that exceed 4,086 kilograms, or 9,000 pounds, are traditionally equipped with rigid I-beam type axles. These axles are used in this application because of their ability to carry high axle loads at a reasonable cost, and their durability history in truck usage. Recently, several manufacturers have used independent type front suspension designs. A multi-link type suspension offers some unique solutions in optimizing the front suspension design. This paper describes the performance goals (i.e. Suspension Design Factors) and tradeoffs in pursuit of the final design. Establishing these SDF’s, achieving them and their relationship to vehicle performance are the focus of this paper. Plots of the kinematic and elastic characteristics are included to illustrate some of the unique features of this multi-link suspension.