Among all these criteria, I would like to examine two that I consider to be important, namely comfort, and cost-effectiveness.
The number of models and makes of cars available in the marketplace today is mind-boggling. It would hardly be possible to compare and contrast the merits and demerits of all such models. Instead, I shall be examining the transmission systems of only two models, namely the Honda CVT, and the THM 350.
The Turbo Hydra-Matic (THM) 350 is an automatic transmission system, largely used by General Motors (GM) and other automobile makers. It has a three-element hydraulic torque converter and two planetary gear sets. Other transmission components include four multiple-disc clutches, two roller clutches, and one intermediate overrun band, all of which act together as the friction elements. Working pressure is provided by a hydraulic system, which is pressurized by a gear type pump (TH350.netfirms.com).
A major weakness that has been pointed out in THM 350 is the second gear mechanism that uses intermediate roller clutches or sprag. This mechanism uses a band in place of clutch packs. As a result frequent failure of the second gear has been reported, particularly during racing campaigns, leading to increased cost of repairs. ...Show more