Konstruktionsunderlag av hjulupphängning för mobil materialhanteringsutrustning

Sammanfattning: AIT Umeå is a manufacturer of mobile material handling equipment, mainly for the aviation industry. The products are complete vehicles or wheel systems that can be mounted on already existing designs. AIT is considering expanding their offer with a smaller wheel system designed for a load of up to 1 ton. The purpose of this work is to develop a design concept of a wheel suspension that meets the demands of the clients.  The project was conducted through three main topics. Design concept, structural design and compilation of drawings for manufacturing. From three initial concepts, one was selected and further improved, before the final concept was presented. The strength analysis was conducted parallel by using traditional strength analysis and by finite element method. Finally, drawings for manufacturing and assembly of components were made.  The project resulted in a wheel suspension that meets all demands on the product. The suspension is based on a gas spring and linear rails that allow for 22 mm leveling in both directions around the regular height. A cover case and a wheel brush device were also designed to protect the suspension from the environment. The frame is subjected to stresses up to 77 MPa, which gives a safety factor of more than 4 times the yield stress of the material. The low-stress design was governed by allowable bending to meet tolerances and to be suitable for all applications and environments.