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A technology of planetary gears and planetary gear sets, applied in the direction of vehicle gearboxes, components with teeth, gear transmissions, etc., can solve the problems of large installation space, increase consumption, increase manufacturing costs, etc. The effect of benefiting the manufacturing cost
Active Publication Date: 2017-08-18
ZF FRIEDRICHSHAFEN AG
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However, it has been shown that not only the manufacturing costs are increased but also the consumption due to the considerable installation space required for connecting the motor via the additional pre-gear ratio
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[0032] Figures 1 to 9 Various embodiments of the multi-stage transmission according to the invention for vehicles, in particular motor vehicles, in planetary gear construction, for example as an automatic eight-speed transmission or an automatic transmission, are shown, Figure 10 An example of a shift map for realizing the different gears is shown.
[0033] Regardless of the specific embodiment, the multi-stage transmission is only shown schematically as a gear set with a housing 9 . The drive unit An and the output unit Ab are likewise shown schematically, for example as an internal combustion engine. The proposed multi-stage transmission comprises six shafts 1 , 2 , 3 , 4 , 5 , 6 and a fixed housing coupling 0 . Furthermore, at least one electric machine EM as well as a first planetary gear set RS1 , a second planetary gear set RS2 and a third planetary gear set RS3 are provided, wherein the drive unit An, for example as an internal combustion engine, can be operated via...
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Abstract
The invention relates to a planetary multi-stage transmission for a vehicle, comprising at least one electric machine (EM) and three planetary gear sets (RS1, RS2, RS3) in a housing (9), wherein a driving device (An) can be connected to a first shaft (1) by means of a shifting element (K0) and an output (Ab) is connected to a second shaft (2), wherein four further shafts (3, 4, 5, 6) and at least five further shifting elements (B1, K1, K2, K3, K4) are provided, by means of the actuation of which shifting elements at least eight forward gears (G1, G2, G3, G4, G5, G6, G7, G8) can be realized. According to the invention, the first element of the first planetary gear set (RS1) is connected to the housing (9), wherein the first shaft (1) is connected to the second element of the first planetary gear set (RS1) in a fixed manner, wherein the rotor (10) of the electric machine (EM) is connected to the third element of the first planetary gear set (RS1) and wherein the third element of the first planetary gear set (RS1) can be connected to at least one element of at least one further planetary gear set (RS2, RS3) by means of at least one shifting element (K3, K4).
Description
technical field [0001] The invention relates to a planetary multi-stage transmission for vehicles of the type defined in detail in the preamble of claim 1, comprising at least one electric machine and a plurality of planetary gear sets. Background technique [0002] Vehicle technology discloses such hybrid transmissions with which purely electric starting and purely electric driving as well as starting of the internal combustion engine from purely electric driving, so-called traction starting, are possible. In addition, hybrid driving with load point changes is conceivable. It is also known to connect the electric machine to the transmission input shaft via an additional pre-gear ratio. The electric machine can thus be designed with a lower torque. [0003] For example, DE 10 2009 046 367 A1 discloses such a hybrid multi-stage transmission of planetary gear design with an additional predrive ratio for the electric machine. However, it has been found that due to the consid...
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