10123Progressive multileaf helper springs

The spring span is suspended between the fixed hanger and the swinging shackle. The spring consists of a stack of leaves clamped together near the mid-position, with about two thirds of the leaves bowed (cambered) upward so that their tips contact and support the immediate leaf above it. The remainder of the leaves bow downward and so do not assist in supporting the body weight when the car or van is only partially laden. As the vehicle becomes loaded, the upper spring leaves will deflect and curve down on either side of the axle until their shape matches the first downward set lower leaf. This provides additional upward resistance to the normally upward bowed (curved) leaves so that as more leaves take up the downward bowed shape more of the leaves become active and contribute to the total spring stiffness. This progressive springing has been widely used on cars and vans.

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