Details On Upcoming Ford And GM 10-Speed Transmission Reaches The Internets - GM Authority (blog)
The Truth About Cars recently published an inside look at where the Ford and General Motors collaborative effort stands on the upcoming 10-speed automatic transmission. Patent sketches give us an idea on how the engineers at Ford are developing their newest generation of transmissions, being the most cogs we’ve seen in a vehicle ever. The unit is estimated to weigh no more than GM’s 8L90 8-speed do to clever packaging similar to the current 8-speed designs on the market. There is a direct drive ratio where the input and the output shafts spin at the same speed. -There are 4 simple planetary gear sets, just like the ZF 8HP and the GM 8L transmission families. -There are six shift elements (as compared to 5 for the ZF 8HP and the GM 8L). 2 brakes (A and B) that are nested (one shift element is packaged inside the other). Consequently the frictional losses are likely to be no worse than the 8 speed transmission designs. -The nesting of shift elements means that the overall package size will be pretty similar to the 8 speed transmission designs. -All shifts up and down need one shift element to be opened, and another one to be closed simultaneously. Source: gmauthority.com
