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Experimental Investigation of the Drag Losses in the Shifting Elements of Automatic Transmissions

Cosimo Forleo

Experimental Investigation of the Drag Losses in the Shifting Elements of Automatic Transmissions.

Rel. Carlo Rosso, Lukas Pointner-Gabriel. Politecnico di Torino, Corso di laurea magistrale in Automotive Engineering (Ingegneria Dell'Autoveicolo), 2021


Nowadays market trends in the automotive industry followed by OEMs productions show the increasing spread of industrial, commercial and passenger vehicles equipped with non-manual transmissions. Automatic Transmission (AT) and Dual Clutch Transmission (DCT) gearboxes are characterized by an increased comfort level and a powershift gear change thanks to wet multi-disk clutch-packs. Despite clutch-pack devices bring several advantages in terms of comfort, shifting time, thermal stability and load capacity, they work in a cooling lubricating fluid that, due to oil shear when in disengaged mode and with a relative differential speed between the plates, generates significant power losses and increase vehicle CO2 emissions and fuel consumption. Wet multi-disk clutch-packs are used in a multitude of fields, not exclusively in the automotive one. As mentioned, there are common applications in Passenger Vehicles drivelines (from low-end segments to high-end segments), in Light-Duty and Heavy-Duty Vehicles powertrains, but they are used also in agricultural tractors drivelines, in marine field as in boats and ships drivelines, in industry machinery and in many other fields. As part of a series of research projects, an experimental research on the drag torque test-bench LK-4 at FZG has been conducted with the goal to deeply study the phenomenon of energy loss in and scientifically investigated the various factors that influence the drag torque process for DL disengaged wet multi-disk clutch-packs in real world usage operations. Furthermore, the trends of the characteristic clutch-pack design parameters and the operating parameters inside the transmission have been highlighted through scientifically based model with the final purpose to give some guidelines to future loss-reduced clutch designs.

Relators: Carlo Rosso, Lukas Pointner-Gabriel
Academic year: 2020/21
Publication type: Electronic
Number of Pages: 97
Additional Information: Tesi secretata. Fulltext non presente
Corso di laurea: Corso di laurea magistrale in Automotive Engineering (Ingegneria Dell'Autoveicolo)
Classe di laurea: New organization > Master science > LM-33 - MECHANICAL ENGINEERING
Ente in cotutela: Technical University of Munich (GERMANIA)
Aziende collaboratrici: Technical University of Munich
URI: http://webthesis.biblio.polito.it/id/eprint/17484
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