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US 7,597,645 B2Granted
Multi-speed transmission
AssigneeZF Friedrichshafen AG
InventorGerhard Gumpoltsberger
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AssigneeZF Friedrichshafen AG
InventorGerhard Gumpoltsberger
Estimating the term…
The transmission with one reverse and seven forward gears has input and output shafts, three planetary gear sets (P1, P2, P3), six shafts, and six shifting elements. The input shaft couples the ring gear of set (P1) and detachably couples shaft (5), which couples the spider of set (P3) and detachably couples the output shaft, which couples the ring gear of set (P2). Shaft (3) couples the ring gear of the set (P3) and the carrier of set (P2) and detachably couples the housing (G). Shaft (4) couples the sun gear of set (P2), and detachably couples the housing (G) and shaft (6), which couples the carrier of set (P1) and the sun gear of set (P3). The sun gear of set (P1) is fixed to the housing (G). Either the output shaft detachably couples shaft (3), shaft (5) detachably couples shaft (4), or shaft (3) detachably couples shaft (4).
A multi-speed automatic transmission of a planetary design for a motor vehicle, the transmission comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Gearings having three or more central gears: composed of a number of gear trains without drive passing from one train to another
Characterised by the number of forward speeds: the gear ratios comprising seven forward speeds
Characterised by the number of sets of orbital gears: with three sets of orbital gears
Characterised by the engaging friction means not of the freewheel type, e.g. friction clutches or brakes: with six engaging means
About 1 year 5 months of term left · ends 3 Apr 2028 (estimated)
This application claims priority from German Application Serial No. 10 2006 006 621.9 filed Feb. 14, 2006.
The invention concerns a multi-speed transmission of planetary construction, in particular an automatic transmission for a motor vehicle.
According to the state of the art, automatic transmissions, in particular for motor vehicles, comprise planetary gear sets, which are shifted by means of friction elements or shifting elements, such as possibly clutches and brakes, and are usually connected to a starting element that is subject to a slip effect and is selectively provided with a lockup clutch, such as a hydrodynamic torque converter, or a fluid clutch.
The invention will be explained in more detail in the following based on the examples represented in the drawings, wherein
FIG. 1 shows a schematic view of a preferred embodiment of a multi-speed transmission according to the invention;
FIG. 2 shows an exemplary schematic shifting diagram of the multi-speed transmission of FIG. 1 according to the invention;
In FIG. 1, a multi-speed transmission according to the invention is depicted, comprising an input shaft 1 (An) and an output shaft 2 (Ab), which are arranged in a housing G. Three planetary gear sets P1, P2, and P3 are provided, which are preferably designed as negative planetary gear sets and are arranged in the sequence P1, P2, P3 in the axial direction.
As is shown in FIG. 1, only six shifting elements, namely two brakes 03, 04 and four clutches 15, 23, 25 and 46, are provided. Selective engagement of preferably seven forward gears and one reverse gear can be realized with these shifting elements. The multi-speed transmission according to the invention has a total of six rotatable shafts, namely the shafts 1, 2, 3, 4, 5, and 6.
In the multi-speed transmission of FIG. 1, it is provided according to the invention that input is applied by means of the shaft 1, which is permanently connected to the ring gear of the first planetary gear set P1 and can be releasably connected by way of a clutch 15 to the shaft 5, which is permanently connected to the carrier of the third planetary gear set P3 and can be releasably connected by way of a clutch 25 to the output shaft 2, which is permanently connected to the ring gear of the second planetary gear set P2. The shaft 3 is also permanently connected to the ring gear of the third planetary gear set P3 and to the carrier of the second planetary gear set P2, and can be coupled to the housing G by way of the brake 03. The shaft 4 is permanently connected to the sun gear of the second planetary gear set P2, can be coupled to the housing G by way of the brake 04, and can be releasably connected by way of the clutch 46 to the shaft 6, which is permanently connected to the carrier of the first planetary gear set P1 and to the sun gear of the third planetary gear set P3. According to the invention, the sun gear of the first planetary gear set P1 is connected to the housing G (shaft 0) in a slip free manner. The output shaft 2 can also be releasably connected to the shaft 3 by way of a clutch 23.