Automobile steel plate spring assembly with auxiliary spring made of composite material and assembly method thereof

Abstract

The invention discloses an automobile steel plate spring assembly with an auxiliary spring made of a composite material. The automobile steel plate spring assembly comprises a U-shaped bolt metal clamping plate, a main spring, the auxiliary spring and a lower gasket. The lower gasket, the auxiliary spring, the main spring and the U-shaped bolt metal clamping plate are sequentially stacked from bottom to top and then are fixedly connected for limiting through a center bolt, and clamping and fixing are assisted through a U-shaped bolt. The main spring is a steel plate spring, and the auxiliary spring is a composite material plate spring. The auxiliary spring is made of the E glass fibers / polyurethane composite material and is integrally formed through a high-pressure RTM technique. The fiber laying layers of the composite material are all 0 degree, and the volume content of the fibers of the composite material is 58%. According to the automobile steel plate spring assembly with the auxiliary spring made of the composite material, on the basis that the requirement for the performance of an automobile steel plate spring is met, design cost is reduced, the mass of the plate spring assembly is lowered, and the service life of the plate spring assembly is prolonged. The invention further discloses an assembly method of the automobile steel plate spring assembly with the auxiliary spring made of the composite material.

Description

technical field [0001] The invention relates to a leaf spring assembly of an automobile suspension, in particular to an automobile leaf spring assembly with a secondary spring of composite material, belonging to the field of automobile parts. Background technique [0002] The structural forms, materials, manufacturing methods and design methods of leaf springs have been progressing and developing. There are four types of common automobile leaf springs: multi-piece equal-section type, main and auxiliary spring composite type, few-piece variable-section type, and gradual stiffness type. [0003] Traditional automobile leaf springs have always been made of spring steel with excellent fatigue resistance. However, the development trend of the world's automobile industry shows that safe, energy-saving and environmentally friendly vehicles have become the mainstream of automobile development in the 21st century, and to achieve the goals of safety, energy saving and environmental p...

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Problems solved by technology

[0011] The above-mentioned patent applications involve the use of composite material leaf springs as the main spring. Since the main spring is not designed with a parabola, its bearing capacity is limited, and the stress distribution during use is uneven; the composite material leaf spring is used as the main spring. It can consider the extreme conditions in the use process, such as the installation on heavy trucks, the extremely bad road conditions, and the requirements for the safety and passability of the car under severe overload conditions; at the same time, it can be seen that if the car uses leaf springs and secondary springs , the mass of the whole vehicle will be relatively large, which will affect the fuel economy of the vehicle, and the fatigue life of the leaf spring and the driving safety of the vehicle have not been improved.

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