Eventos Anais de eventos
COBEF 2017
Congresso Brasileiro de Engenharia de Fabricação
Powertrain Sizing for an Off-road Vehicle
Submission Author:
Alberto Paiva , RJ , Brazil
Co-Authors:
Bianca Chaves, Luís Vítor Martins Peres, Lucas Assunção, Lucas de Oliveira Lima, Jorge Mansur, Alberto Paiva
Presenter: Bianca Chaves
doi://10.26678/ABCM.COBEF2017.COF2017-1263
Abstract
Powertrain design is a well-established subject in the literature; nevertheless, its application should be sized according to the vehicle requirement. Depending on that, usual standard directions and bibliographic designing recommendations may not apply to multipurpose extreme demands, such as in off-road vehicles. Within this context, this paper focuses on the design methodology and numerical simulation of a powertrain system for an off-road BAJA type vehicle, taking into account the track tests requirements specified for BAJA SAE Brasil competition. The selected driveline involves a commercial Continuously Variable Transmission (CVT), followed by a fixed-reduction gearbox, handmade designed for this specific application. The proposed archetype should combine high torque to overcome severe obstacles with strong acceleration and final speed during the endurance test. Initially, a longitudinal dynamics analysis is conducted, taking into account the technical information of both engine and CVT, together with the vehicle performance requirements, in order to determine the optimal reduction ratio of the gearbox to explore the desired engine power range. The next step concerns the gearbox design, which comprises two tasks: design setup with the respective analytical calculations involving fatigue analysis of shafts and gears to obtain the desired reduction ratio and numerical simulation of these machine components, using computer-aided designing tools. The simulations consider static finite element stress analysis for them, based on the previous analytical design calculations, performed in ANSYSâ. Performance results attest a balanced power transmission, in view of the above-cited contrasting demands.
Keywords
Powertrain, off-road vehicle, design methodology, Powertrain, off-road vehicle, design methodology
