Diseño de una caja de cambios secuencial de competición tipo Zeroshift

Abstract

The main goal of the current project is to design and calculate a sequential gearbox for a competition motorcycle using a Zeroshift design. The mechanism is formed by two main axes, four spur gears, two spur rings, two forks and a shift selection mechanism, composed by an axis and a slotted cylinder. This gearbox will be connected to a 31.4 kW electric motor which will be transmitted at a rotational speed of 6000 rpm, working with a torque with a value of 50 Nm. The objective of this gearbox is to improve the results of the motorcycle designed by the University of La Laguna in the competition Motostudent by providing it a transmission mechanism which allows the pilot to change between two gears without the need of clutching. This means that the time spent clutching from one gear to the other will be eliminated, resulting in a better time per lap, improving the position of the University team in the competition. This work includes the calculations related to resistance, stress, and fatigue verifications of the main elements of the gearbox, such as axes and spur gears, while others, such as the rolling bearings, were selected from the catalogues of several manufacturers attending to working conditions. Furthermore, the design of every component and their assembly, and the simulation of the working conditions of these components have been made by using the CAD software SolidWorks.