Leaf Springs

Either a simple beam used as a spring or laminations of steel.

A slightly arched steel band used as a spring. An axle is suspended from the approximate center of the steel band; the bending of the band provides a cushioning effect.

The term is also used to refer to a bundled set of leaf springs. Each leaf is fastened to the next through a bolt placed slightly ahead of the centre of the spring. As the spring flexes, the leaves slide over each other; the resultant friction provides a dampening of the oscillations produced by large spring deflections.


Semi-elliptic laminated leaf spring

where
E = Youngs modulus [Nm-2]
n = number of leaves
b = width of leaves [m]
t = thickness of leaves [m]
l = span [m]

Quarter-elliptic laminated leaf spring

where
E = Youngs modulus [Nm-2]
n = number of leaves
b = width of leaves [m]
t = thickness of leaves [m]
l = span [m]

Elliptical Leaf Spring

Two sets of semi-elliptic laminated leaf springs mirrored together with rotating joints at each end.

The image shows the elliptic leaf spring on a horse drawn cart.

Arch

The curve on a leaf spring. If the center is lower than the ends it is called positive arch. If the center is higher than the ends the arch is negative.

Berlin Eye

Refers to the eye of a leaf spring when the eye is upturned.

Cantilever

When used with regard to leaf springs, the front cantilever is the portion of the spring that extends forward of the U-plate; the rear cantilever is the portion of the spring extending back to the shackle.

Compression Shackle

A short arm connecting the rear of the leaf spring to the frame which limits travel by compression.

Downturned Eye

Refers to the eye of a leaf spring when the spring turns down to form the eye.

Eye Diameter

The inner diameter of the eyelet at each end of a leaf spring; this provides an attachment point to the frame (front) or to a shackle (rear).

Inactive Length

The central portion of a leaf spring that is prevented from flexing by the U-plate.

Splayed Springs

Leaf springs that are not parallel to the centreline of the vehicle in the plan view.

Spring Top Leaf Thickness

The thickness of the topmost leaf in a multiple-leaf spring.

Tension Shackle

A link attached to the rear eye of a leaf spring and to the frame of the vehicle.

Tie Bolt

A fastener which passes through the leaves of a leaf spring, holding it together.

U-bolt

The U-shaped bolt connecting a leaf spring to the axle.

See also: Coil Spring, Hotchkiss Suspension, Springs, U Bolt.

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Subjects: Mechanical Engineering


Weblinks:
Truck Leaf Springs International dealer of leaf springs for truck, suv, and van.