Patent ID: 8495925
Filing Date: 2013-07-30
Classification: F16H,Y10T

Abstract:
1. A gearbox with at least five forward gears and one reverse gear for a motor-vehicle double-clutch transmission, the gearbox comprising: two primary shafts coaxial with each other, and one secondary shaft and one lay shaft, the secondary shaft and the lay shaft being arranged parallel to the two primary shafts, a plurality of fixed gearwheels carried by the two primary shafts and acting as driving gearwheels for gear trains associated with the forward gears and with the reverse gear, a plurality of idle gearwheels carried by the secondary shaft and acting as driven or intermediate gearwheels for gear trains associated with the forward gears and with the reverse gear, and a final reduction pinion carried by the secondary shaft, a first idle gearwheel carried by the lay shaft and acting as driven gearwheel for a first gear train associated with the reverse gear, a second idle gearwheel carried by the lay shaft and acting as a driven gearwheel for a second gear train associated with one of the forward gears, and a fixed gearwheel carried by the lay shaft and acting as a parking gearwheel; and wherein the lay shaft is permanently kinematically connected to the secondary shaft via a third gear train comprising a first fixed gearwheel carried by the lay shaft, a second idle gearwheel coaxial with the two primary shafts and a third fixed gearwheel carried by the secondary shaft, the two fixed gearwheels of the third gear train meshing permanently both with the idle gearwheel of said third gear train.