Projeto da parte mecânica de uma cadeira de rodas motorizada

Abstract

Checking the Brazilian motorized wheelchair market, it was found that they are very sophisticated and therefore expensive, with a range of cost of R$ 4.700,00 to R$ 16.500,00, which does not attend many of those interested in this type of equipment. To solve this problem is proposed that by simplifying the components and structure of the motorized wheelchair is possible to significantly reduce its price. The main goal is to design the structure and the transmission system for a motorized wheelchair. The method used to achieve the goals is to search the existing literature. From the literature review a 3D model of the wheelchair will be created, to design the structure this model will be analyzed be numerical methods. The shafts design will be made by using analytical methods. As results was showed that the selected electric motor is able to run the motorized wheelchair, by using a two stages reduction power train, the first made by worm gear with a 25:1 gear ratio and the second made by sprocket driving a chain with 1,57:1 ratio. As structure material to build the wheelchair na ABNT 6061-T6 aluminum alloy tube with a diameter of 1” and a wall thickness of 1”/16 was selected, which proved to be adequate by the analysis made. At the end of the design was verified that is possible to produce a prototype of the motorized wheelchair (without controllers) with an estimated budget of R$ 1400,00, which would come to the retail costing about R$ 2550,00, this shows that the main goal was reached, because this price is significantly lowest that the similar commercialized products price. The R$ 1400,00 budget was estimated by buying several components on the retail, as the motors and batteries, for instance, that combined represents about 60% of the budget. Then, in the case of a big production, suppliers should by developed, making possible to buy the components direct from the industry, reducing even more the price.