Vehicle drive train has auxiliary force-assisted gearbox shifting with couplings supplied with/operated by common fluid pressure, second coupling only operated if fluid pressure exceeds threshold required to operate first coupling

摘要

The drive train has an auxiliary force-assisted gearbox shifting arrangement with at least two couplings supplied with and operated by a common fluid pressure. The second coupling is configured so that it is only operated if the fluid pressure exceeds a threshold required to operate the first coupling (105).