Double-clutch transmission for vehicles

A gearbox, comprising;

• an inner input shaft and an outer input shaft, at least a portion of the inner input shaft surrounded by the outer input shaft;
• a first clutch connected to the inner input shaft and a second clutch connected to the outer input shaft;
• a first layshaft, a second layshaft and a third layshaft spaced apart from the input shafts and arranged in parallel to the input shafts;
• at least one of the layshafts comprising a pinion for outputting a drive torque;
• gearwheels arranged on the first layshaft, on the second layshaft, on the third layshaft, on the inner input shaft and on the outer input shaft, the gearwheels comprising a first gearwheel group, a second gearwheel group, a third gearwheel group, a fourth gearwheel group, a fifth gearwheel group, a sixth gearwheel group and a seventh gearwheel group for providing seven sequentially increasing gears,
• the first gearwheel group comprising a first fixed gearwheel on the inner input shaft, meshing with a first gear idler gearwheel on one of the layshafts,
• the third gearwheel group comprising a third driving gearwheel on the inner input shaft, meshing with a third driven gearwheel on one of the layshafts,
• the fifth gearwheel group comprising a fifth fixed gearwheel on the inner input shaft, meshing with a fifth gear idler gearwheel on one of the layshafts,
• the seventh gearwheel group comprising a seventh fixed gearwheel on the inner input shaft, meshing with a seventh gear idler gearwheel on one of the layshafts,
• the second gearwheel group comprising a second fixed gearwheel on the outer input shafts, meshing with a second gear idler gearwheel on one of the layshafts,
• the fourth gearwheel group comprising a fourth fixed gearwheel on the outer input shafts, meshing with a fourth gear idler gearwheel on one of the layshafts,
• the sixth gearwheel group comprising a sixth fixed gearwheel on the outer input shafts, meshing with a sixth gear idler gearwheel on one of the layshafts, and
• each gearwheel group comprising a coupling device which is arranged on one of the layshaft to selectively engage one of the gearwheels for selecting one of the seven gears, and
• the fourth fixed gearwheel further meshing with the sixth gear idler gearwheel,
• wherein the fifth fixed gearwheel further meshes with the seventh gear idler gearwheel, and
• the gearwheels further comprises a reverse gearwheel group that comprises a fixed gearwheel on one of the input shafts, meshing with a reverse gear idler gearwheel on one of the layshafts for providing a reverse gear, and
• the reverse gearwheel group further comprises a coupling device which is arranged on the layshaft mounted with the reverse gear idler gearwheel to selectively engage the reverse gear idler gearwheel;
• and
• an output gearwheel on an output shaft, the output gearwheel meshing with the pinions.

A power train device, comprising:

• an inner input shaft and an outer input shaft, at least a portion of the inner input shaft surrounded by the outer input shaft;
• a first clutch connected to the inner input shaft and a second clutch connected to the outer input shaft;
• a first layshaft, a second layshaft and a third layshaft spaced apart from the input shafts and arranged in parallel to the input shafts;
• at least one of the layshafts comprising a pinion for outputting a drive torque;
• gearwheels arranged on the first layshaft, on the second layshaft, on the third layshaft, on the inner input shaft and on the outer input shaft, the gearwheels comprising a first gearwheel group, a second gearwheel group, a third gearwheel group, a fourth gearwheel group, a fifth gearwheel group, a sixth gearwheel group and a seventh gearwheel group for providing seven sequentially increasing gears,
• the first gearwheel group comprising a first fixed gearwheel on the inner input shaft, meshing with a first gear idler gearwheel on one of the layshafts,
• the third gearwheel group comprising a third driving gearwheel on the inner input shaft, meshing with a third driven gearwheel on one of the layshafts,
• the fifth gearwheel group comprising a fifth fixed gearwheel on the inner input shaft, meshing with a fifth gear idler gearwheel on one of the layshafts,
• the seventh gearwheel group comprising a seventh fixed gearwheel on the inner input shaft, meshing with a seventh gear idler gearwheel on one of the layshafts,
• the second gearwheel group comprising a second fixed gearwheel on the outer input shafts, meshing with a second gear idler gearwheel on one of the layshafts,
• the fourth gearwheel group comprising a fourth fixed gearwheel on the outer input shafts, meshing with a fourth gear idler gearwheel on one of the layshafts,
• the sixth gearwheel group comprising a sixth fixed gearwheel on the outer input shafts, meshing with a sixth gear idler gearwheel on one of the layshafts, and
• each gearwheel group comprising a coupling device which is arranged on one of the layshaft to selectively engage one of the gearwheels for selecting one of the seven gears, and
• the fourth fixed gearwheel further meshing with the sixth gear idler gearwheel,
• wherein the fifth fixed gearwheel further meshes with the seventh gear idler gearwheel, and
• the gearwheels further comprises a reverse gearwheel group that comprises a fixed gearwheel on one of the input shafts, meshing with a reverse gear idler gearwheel on one of the layshafts for providing a reverse gear, and
• the reverse gearwheel group further comprises a coupling device which is arranged on the layshaft mounted with the reverse gear idler gearwheel to selectively engage the reverse gear idler gearwheel;
• an output gearwheel on an output shaft, the output gearwheel meshing with the pinions;
• and
• at least one power source for generating a driving torque.