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A technology for transmissions and clutches, which is applied to vehicle gearboxes, multi-ratio transmissions, transmissions, etc., can solve problems such as high hydraulic loss, and achieve the effects of reducing structural consumption, reducing wear, and reducing structural space
Inactive Publication Date: 2015-06-17
ZF FRIEDRICHSHAFEN AG
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[0012] The shifting elements of multi-stage transmissions designed in this way according to the prior art, which are usually designed as multi-plate clutches or brakes, are hydraulically actuated, which disadvantageously has high hydraulic losses
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[0037] 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 arranged in a housing G. 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 present invention, at least one of the planetary gear sets P1, P2, P3 can be configured as a positive gear ratio planetary gear set, when the planet carrier and the ring gear are connected and replaced at the same time and the value of the fixed transmission gear ratio is the same as the negative gear ratio planetary gear The implementation of the group is improved by 1 time compared to that.
[0038] In the illustrated embodiment, the planetary gear sets are arranged in the order of a first planetary gear set P1 , a second planetary gear set P2 , a third planetary gear set P3 , and a fourth planetary gear set P4 as viewed axially. Accordi...
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Abstract
The invention relates to a multi-stage transmission comprising four planetary gear wheel sets (P1, P2, P3, P4), eight rotatable shafts (1, 2, 3, 4, 5, 6, 7, 8) and six shifting elements (03, 04, 05, 15, 17, 48), wherein the sun gear of the first planetary gear wheel set (P1) is connected to the fifth shaft (5), which can be connected to the drive shaft (1) by a first coupling (15) and can be coupled to the housing (G) via a third brake (05), wherein the drive shaft (1) can be connected via a second coupling (17) to the seventh shaft (7), connected to the web of the fourth planetary gear wheel set (P4) and the ring gear of the third planetary gear wheel set (P3), and is connected to the sun gear of the second planetary gear wheel set (P2), wherein the sixth shaft (6) is connected to the ring gear of the first planetary gear wheel set (P1), the web of the second planetary gear wheel set (P2) and the ring gear of the fourth planetary gear wheel set (P4) and the third shaft (3) is connected to the sun gear of the third planetary gear wheel set (P3) and the sun gear of the fourth planetary gear wheel set (P4) and can be coupled to the housing (G) via a first brake (03), wherein the fourth shaft (4) is connected to the web of the first planetary gear wheel set (P1), can be coupled to the housing (G) via a second brake (04) and can be connected via a third coupling (48) to the eight shaft (8), which is connected to the ring gear of the second planetary gear wheel set (P2), and wherein the drive shaft (2) of the transmission is connected to the web of the third planetary gear wheel set (P3).
Description
technical field [0001] The invention relates to a multi-speed transmission according to the preamble of claim 1 , in particular an automatic transmission for a motor vehicle. 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 first planetary gear set ...
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