Diseño conceptual de rectificadores para cvts dinámicas
- Autores: José Morales Sánchez
- Directores de la Tesis: Francisco de Asis García Benitez (dir. tes.)
- Lectura: En la Universidad de Sevilla ( España ) en 2012
- Idioma: español
- Tribunal Calificador de la Tesis: Publio Pintado Sanjuán (presid.), José María Castillo Granados (secret.), Antonio Giugliotta (voc.), Michael Butsch (voc.), Chris Brace (voc.)
- Materias:
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- Resumen
This thesis is focused in the design of optimized rectifier mechanisms which will be used in continuously variable transmission systems (CVTs).
A detailed state of the art focused on the dynamic CVTs and torque converters (TCs) is presented. All cases contain the description of the functioning and an analytical study. For some of the system a computer model to confirm the analytical results has been created.
All dynamic type CVTs have similar working characteristics, so they all bear the same problems derivatives from the principle of operation of this type of transmission. The main of them is the rectifier mechanism of movement needed for the proper operation. This is because this type of CVTs needs to transform, at some point, an oscillating movement to one with a unique direction that can be used by the drive wheels of the vehicle.
The current commercial rectifiers limit the maximum rotational speed on the output shaft of the transmission preventing their use in cars and industrial vehicles. Nowadays, the only viable application of this kind of CVTs focuses on tractors and other agricultural machinery with low working speed.
However, this thesis has shown that, with a proper design of the rectifier system, it is possible to circumvent the limitations of these freewheels so the final output speed is the appropriate (without affecting the torque transmitted by the freewheel).
An additional important issue is the identification of the source of vibrations that appears in the functioning of all dynamic TCs and CVTs listed in the state of the art and in the Self-Adaptive Dynamic CVT developed by the research group. This subject is discussed and suggestions for improvement are made. These vibration sources are intrinsic to the operating principle of the dynamic CVTs, so it can not be eliminated. Various systems have been designed to control this type vibration.
Finally, new transmission systems are proposed. The main goal in these new designs is to increase the compactness and simplify the Self-Adaptive Dynamic CVT developed by the research group.
