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[0012] According to the prior art, the shifting elements of multi-stage transmissions constructed in this way, usually in the form of multi-plate clutches or multi-plate brakes, are hydraulically actuated, which disadvantageously leads to high hydraulic losses
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[0035] exist figure 1 shows a multi-stage transmission according to the invention, which comprises a drive shaft 1 , a driven shaft 2 and four planetary gearsets P1 , P2 , P3 and P4 which are arranged in a housing G. The planetary gear sets P1, P2, P3, P4 are in figure 1 The example shown is configured as a negative planetary gear set. According to the invention, at least one of the planetary gear sets P1, P2, P3, P4 can be configured as a positive gear ratio planetary gear set, when the planetary carrier connection and the ring gear connection are replaced at the same time and the value of the fixed transmission ratio is the same as As the embodiment of the planetary gear set with a negative transmission ratio, it is 1 hour higher than that.
[0036] In the illustrated embodiment, the planetary gear sets P1, P2, P3, P4 are viewed axially as a first planetary gear set P1, a second planetary gear set P2, a third planetary gear set P3, a fourth planetary gear set The sequence...
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Abstract
The invention relates to a multi-ratio transmission having nine forward gears and one reverse gear, comprising four planetary gear sets (P1, P2, P3, P4), eight rotatable shafts (1, 2, 3, 4, 5, 6, 7, 8) and six shift elements (03, 04, 05, 14, 17, 18), wherein the sun gear of the first planetary gear set (P1) is connected to the fifth shaft (5), which is connected to the sun gear of the third planetary gear set (P3) and can be coupled to the housing (G) via a third brake (05). The drive shaft (1) can be detachably connected to the fourth shaft (4) via a first clutch (14), which is connected to the web of the third planetary gear set (P3) and to the sun gear of the second planetary gear set (P2) and can be coupled to the housing (G) via a second brake (04). The drive shaft (1) can be detachably connected to the seventh shaft (7) which is connected to the internal gear of the third planetary gear set (P3) via a second clutch (17), and can be detachably connected to the eighth shaft (8) which is connected to the internal gear of the fourth planetary gear set (P4) and to the web of the second planetary gear set (P2) via a third clutch (18), the sixth shaft (6) is connected to the internal gear of the second planetary gear set (P2) and to the web of the first planetary gear set (P1), the third shaft (3) is connected to the sun gear of the fourth planetary gear set (P4) and can be coupled to the housing (G) via a first brake (03). The output shaft (3) is connected to the web of the fourth planetary gear set (P4) and to the internal gear of the first planetary gear set (P1).
Description
technical field [0001] The invention relates to a multi-stage transmission of planetary gear design according to the preamble of claim 1 , in particular an automatic transmission for motor vehicles. Background technique [0002] According to the prior art, automatic transmissions, in particular automatic transmissions for motor vehicles, comprise a plurality of planetary gearsets which are shifted by means of friction elements or switching elements, such as clutches and brakes, and which are usually connected to slipping and selectable A starting element with a bridging clutch, such as a torque converter or a fluid coupling, is optionally connected. [0003] Such an automatic transmission is known, for example, from DE 199 12 480 B4 by the applicant. The automatic transmission includes three single-planetary planetary gear sets and three brakes and two clutches for switching six forward gears and one reverse gear, and includes a drive shaft and a driven shaft, wherein the f...
Claims
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