本帖最後由 Simon 於 2013-2-12 23:40 編輯
If we compare dry clutches with oil bath (wet) clutches, we can safely say that the former dissipate energy only during the actual slipping phase of the gear change and on pick-up, whereas wet clutches, which always operate in an oil bath, introduce losses due to viscous friction such as those of conventional automatic transmissions even when they are not in operation. They also require forced cooling with oil and therefore continuous energy expenditure to drive the dedicated oil pump (absent in the case of dry clutches).
Lastly, a "Wet" automatic transmission requires approximately 4.8 litres more gearbox oil than the "Dry" version, again for reasons of clutch cooling (in this way, weight is added and losses due to splashing increase). When all these effects are added together, a dry transmission is found to be approximately 6% more efficient than the corresponding wet one in terms of consumption. Last but not least, the advantages of the "Dry" clutch include the lower running cost and the increased ease of maintenance.
http://www.alfaromeopress.com/press/detail/11325 |
