The co-driver seat with integrated 3 point seat belt and static scissor mechanism of a new generation applied design and development

Thesis Type: Postgraduate

Institution Of The Thesis: Bursa Uludağ University, Fen Bilimleri Enstitüsü, Turkey

Approval Date: 2017

Thesis Language: Turkish

Student: Veli Öztürk

Supervisor: ALİ DURMUŞ


The most effective solution tools of reducing fuel consumption and emissions mitigation are related to the vehicle weight ratio. Like all parts of the vehicle, reducing the weight of the vehicle seat is an important factor. In the design phase, reducing the seat weight is possible by selecting appropriate materials and innovative designs. At the same time, it should focus on reducing investment costs in seat design. Seat design criteria are determined by methodical techniques, and manufacturability should be examined. In this study, the design and development studies of co-driver seat with new scissors system used in heavy commercial vehicles were realized. The 3-point belt adaptation was applied to the co-driver seat which does not have 3 point belt application in the present, and the seat was subjected to more difficult test conditions. The new co-driver seat which we have integrated the 3-point seat belt system has been examined according to ECE R14 regulation of the safety belt anchorage zone. In seat design, the seat belt upper and lower effective points are defined to be within this safety zone. During the design stage, different materials and thicknesses were selected and optimized by evaluating the analysis results. The result of this new design was developed by simulations and finite element analysis. Sufficient strength values and suitable backrest displacement values were aimed at safety tests in the co-driver seats. These tests are stated in ECE regulations. For the validation of the new co-driver seat design, the results of full-scale tests following prototype studies were compared with those of final analysis. The full-scale test results were compatible with the analysis results with a ratio of 90-95%. In the design phase, the local deformation zones determined by the finite element analysis were observed in the same regions compared to the actual tests and necessary improvements were made in these regions. The new seat frame without compromising on strength, an overall 15-20% weight reduction was achieved. A static scissor system and 3-point belt adaptation were applied to provide height adjustment function in the co-driver seat for the first time and the new design meets ECE R14 safety norms.