DOUBLE-CLUTCH TRANSMISSION FOR VEHICLES
A double-clutch transmission (DCT) includes, but is not limited to an inner input shaft inside an outer input shaft. A first clutch disc and a second clutch disc of the DCT are connected to the two input shafts respectively. Pinions are fixed onto three parallel layshafts of the DCT respectively. The gearwheels on the layshafts include, but are not limited to seven gearwheel groups. Each of the gearwheel group includes, but is not limited to a fixed gearwheel that meshes with an idler gearwheel. A fourth fixed gearwheel on the outer input shaft meshes with the fourth gear idler gearwheel and the sixth gear idler gearwheel. In particular, a fifth fixed gearwheel on the inner input shaft meshes with a fifth gear idler gearwheel and the seventh gear idler gearwheel. The gearwheels further includes, but is not limited to a reverse gearwheel group that includes, but is not limited to a fixed gearwheel on one of the input shafts, meshing with a reverse gear idler gearwheelon one of the layshafts.
1 . A double-clutch transmission, 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 layshafts 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.
2 . The double-clutch transmission device according to claim 1 , further comprising:
the first forward gear and the reverse gear are provided by different input shafts.
3 . The double-clutch transmission according to claim 1 , wherein
the reverse gearwheel group provides a first reverse gear and a second reverse gear.
4 . The double-clutch transmission device according to claim 1 , further comprising
a reverse gear shaft, a reverse gearwheel and a reverse pinion, the reverse gearwheel and the reverse pinion mounted on the reverse gear shaft.
5 . The double-clutch transmission device according to claim 1 , further comprising
a park-lock.
6 . The double-clutch transmission device according to claim 1 , wherein
the first gear idler gearwheel is provided on one of the layshafts while the fourth idler gearwheel, the fifth idler gearwheel, the sixth idler gearwheel and the seventh idler gearwheel are provided on the remaining layshafts.
7 . The double-clutch transmission according to claim 1 , wherein
at least two of the second gear idler gearwheel, the third driven gearwheel, the fourth gear idler gearwheel and the fifth gear idler gearwheel are mounted on the same layshaft.
8 . The double-clutch transmission according to claim 1 , wherein
the sixth gear idler gearwheel and the seventh gear idler gearwheel are mounted on the same layshaft.
9 . The double-clutch transmission according to claim 1 , further comprising
bearings for supporting the layshafts, at least one of the bearings being provided next to each of the pinions.
10 . The double-clutch transmission according to claim 9 , wherein
at least one of the bearings is provided next to one of the idler gearwheels of low gears.
11 . 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.
12 . 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.
13 . The power train device according to claim 12 , wherein
the power source comprises a combustion engine.
14 . The power train device of claim 12 , wherein
the power source comprises an electric motor.
15 . (canceled)