Drive unit for a vehicle, and operating method therefor

摘要

A drive device for a vehicle having a combustion engine and a multistage manual transmission having first and second sub-transmissions, each of which has a separate input shaft. A first input shaft of the first sub-transmission couples, via a first clutch, the combustion engine or is assigned an electrical machine. A second input shaft of a second sub-transmission couples, via a second clutch, the combustion engine. The first input shaft is additionally assigned a start-up element having at least one hydrodynamic transfer element, which has first and second functional wheels which together form a working chamber. The working chamber can be filled with fluid in order to generate a hydrodynamic transfer torque such that at least one start-up function, affecting the first sub-transmission, can carried out by way of the start-up element.

主权项

1. A drive device for a vehicle comprising:
an internal combustion engine (VM); a multistage manual transmission (SG) having first and second sub-transmissions (TG1, TG2), the first sub-transmission having a first transmission input shaft (GE1), and the second sub-transmission having a second transmission input shaft (GE2); the first transmission input shaft (GE1) of the first sub-transmission (TG1) being connected to either a first clutch (K1, K1′) or a coupling shift element (X), associated with an electric machine (EM), for drivingly coupling the first transmission input shaft (GE1) to the internal combustion engine (VM); the second transmission input shaft (GE2) of the second sub-transmission (TG2) being connected to either a second clutch (K2) or a hybrid clutch (K), for drivingly coupling the second transmission input shaft (GE2) to the internal combustion engine (VM); the first transmission input shaft (GE1) being drivingly connected to a start-up element (AR, AR′, AR″) which comprises at least one hydrodynamic transfer element (HK, HD, HB) and a planetary gear set (PS) coupled to one another so as to form a single unit; the at least one hydrodynamic transfer element has a first functional wheel (FR1, STa, STb) and a second functional wheel (FR2, RT), the first and the second functional wheels together form a working chamber (FL, FLa, FLb), which fills with fluid to generate a hydrodynamic transfer torque to implement at least one start-up function, affecting only the first sub-transmission (TG1); the first and the second sub-transmissions (TG1, TG2) form an auxiliary transmission; the first and the second transmission input shafts (GE1, GE2) are disposed coaxially relative to one another; a common transmission output shaft (GA) is disposed coaxially downstream of the first and the second transmission input shafts (GE1, GE2); the first transmission input shaft (GE1) is assigned to the first sub-transmission (TG1) and is embodied as an outer hollow shaft; the second transmission input shaft (GE2) is assigned to the second sub-transmission (TG2) and is disposed in and extends out of the first transmission shaft on a transmission side; the first and the second sub-transmissions (TG1, TG2) are each assigned one of two countershafts (VWI, VW2), which are disposed coaxially over one another and which are drivingly connected to the respective transmission input shaft (GE1, GE2) by one gear plane (EK, G6) having two enmeshed gearwheels; the first and the second sub-transmissions (TG1, TG2) comprise further gear planes (G1, G2, G3, G4, G5, G7, RG); in each of the further gear planes (G1, G2, G3, G4, G5, G7, RG) enmeshed gearwheels are disposed, the gearwheels being either idler gears or fixed gears; each of the gearwheels being either connected to one of the output, the input and the countershafts (GE1, GE2, GA, VW1, VW2) in a rotationally fixed manner or being connectable in a rotationally fixed manner by shifting devices (S1, S2, S3, S4) to one of the output, the input and the countershafts (GE1, GE2, GA, VW1, VW2); a group of gears having odd gears (G1, G3, G5, G7), with at least one start-up gear and at least one reverse gear (RG), is assigned to the first sub-transmission (TG1); and at least one group of gears having even gears (G2, G4, G6) is assigned to the second sub-transmission (TG2).