Patent ID: 9714698
Date: 2017-07-25
CPC Classifications: B60K,F16H

Claim:
1. A shifting device for a dual clutch transmission as a change-speed transmission for motor vehicles, comprising: two coaxially arranged input shafts which are respectively activatable via one of two clutches of a dual clutch; an output shaft; gearwheel sets arranged on the input shafts which are shiftable by means of synchronizing clutches for forming a plurality of forward gears and a reverse gear, said gearwheel sets being divided into a first subtransmission comprising one of the input shafts and a second subtransmission comprising the other one of the input shafts; and a planetary transmission, which is shiftable between at least two transmission stages and is arranged upstream of one of the first and second subtransmissions, and which has an input element, an output element and a transmission element, said input element being permanently drivingly connected with a housing of the dual clutch, wherein for shifting into a first one of the transmission stages the transmission element is fixable via a brake, and for shifting into a second one of the transmission stages the transmission element is connectable with the input element via one of the clutches, wherein the planetary transmission is shifted to a further 1:1 transmission stage when the dual clutch is engaged and the brake is disengaged, and wherein the change-speed transmission has eight forward gears, of which a first and a second forward gear, a fourth and a fifth forward gear, and a seventh and an eighth forward gear, are assigned to the first subtransmission with the upstream arranged planetary transmission and the third and sixth forward gear are assigned to the second subtransmission.