Leaf spring consisting of a fibre-composite material

Abstract

The invention relates to a leaf spring (1) consisting of a fibre-composite material and having a central longitudinal section (2) and two adjoining axial end sections for a wheel suspension in a vehicle, the end sections of said leaf spring tapering with respect to the leaf spring width. The leaf spring (1) is composed of resin-impregnated fibre layers and axially orientated uncut first fibres (6) of the fibre-composite material extend the full length of the leaf spring (1) to the two axial ends (5) of said spring. The axial ends (5) of the unfinished untreated leaf spring (1'), when viewed from above, have an essentially V-shaped geometry or an essentially V-shaped notch and thus form two respective limbs (8, 9) lying transversally to the longitudinal extension of the axis of the untreated leaf spring (11), said limbs (8, 9) abutting one another in the finished leaf spring (1).; To further develop a leaf spring (1) of this type, according to the invention, the fibre fraction at least in the region (11) of the axial ends (5) of the untreated leaf spring (1') is smaller than that contained in the neighbouring axial regions (2, 3, 4).

Description

technical field [0001] The invention relates to a leaf spring made of fiber composite material according to the preamble of claim 1 . Background technique [0002] Leaf springs are often used in the wheel suspension of vehicles to dampen the vehicle on uneven terrain or road conditions. Such motor vehicles may in particular be passenger cars, vans and other commercial vehicles, but also rail vehicles or the like. [0003] Leaf springs made of steel have been known for a long time. In this leaf spring, individual narrow steel plates are stacked with reduced lengths so that a variable spring constant is obtained when the load increases. The steel plates of the leaf spring are joined to form a stack by clamping and / or screwing. This is achieved, for example, transversely to the direction of travel when a leaf spring is installed in a motor vehicle, wherein the central region of the leaf spring is fastened to the vehicle body, while the two axial ends of the leaf spring are a...

AI Technical Summary

Problems solved by technology

[0011] However, in part-usual tests of such leaf springs, it has been shown that during the manufacture of the leaf spring during the deformation of the legs on the V-shaped ends and the subsequent compression of the leaf spring, the resin of the fiber composite material is removed from the leaf spring. Insufficient outflow in the end area

Furthermore, it turns out that the fibers in this region are only insufficiently oriented longitudinally, which reduces the load behavior of the leaf spring

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