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US 9,309,971 B2Granted
Powershift transmission and method for operation thereof
AssigneeZF Friedrichshafen AG
InventorJohannes Kaltenbach
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AssigneeZF Friedrichshafen AG
InventorJohannes Kaltenbach
Estimating the term…
A powershift transmission with a dual-clutch main transmission and a downstream planetary gearset. The main transmission includes two partial transmissions and corresponding input shafts and clutches and a common output shaft. The downstream transmission has an input shaft which couples, via a third shifting element, the common output shaft and is fixed to a first planetary gearset element. The downstream transmission has an output shaft that is fixed to a second planetary gearset element. A third planetary gearset element couples a housing by way of a fourth shifting element, to obtain a low driving range of the downstream transmission, or, the downstream transmission output shaft by way of a fifth shifting element to obtain a high driving range of the downstream transmission. The common output shaft can couple, via a sixth shifting element, the third planetary gearset element, which can couple, via the fourth shifting element, the transmission housing.
A powershift transmission (1) for a motor vehicle, the powershift transmission comprising:
A method of operating a powershift transmission (1) of a motor vehicle which comprises a main transmission (2), in a form of a dual-clutch transmission, and a downstream transmission (3), in a form of a planetary gearset, connected downstream from the main transmission (2);
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Without interruption of drive: with two inputs, e.g. selection of one of two torque-flow paths by clutches
Change gear transmissions in group arrangement: with an additional planetary gear train, e.g. creep gear, overdrive
Smoothing ratio shift: synchronisation before shifting
Without interruption of drive: with orbital gears
About 8 years 4 months of term left · ends 10 Mar 2035 (estimated)
This application claims priority from German patent application serial no. 10 2014 205 276.9 filed Mar. 21, 2014.
The invention concerns a powershift transmission and methods for its operation.
DE 10 2007 047 671 A1 describes a powershift transmission for a motor vehicle, having a main transmission in the form of a dual-clutch transmission and a downstream transmission in the form of a planetary gearset that is connected downstream from the main transmission. The main transmission comprises a first partial transmission and a second partial transmission, wherein a first main transmission input shaft of the first partial transmission is associated with a first frictional powershift clutch and a separate, second main transmission input shaft of the second partial transmission is associated with a second frictional powershift clutch. Each of the two partial transmissions of the main transmission in the form of a dual-clutch transmission comprises, respectively, at least one interlocking shifting element. For the two partial transmissions a common main transmission output shaft is provided. The downstream transmission in the form of a planetary gearset comprises a downstream transmission input shaft and a downstream transmission output shaft. The output shaft of the main transmission can be coupled by means of an interlocking shifting element to a first planetary gearset element of the downstream transmission. A second planetary gearset element of the downstream transmission is connected fixed to the output shaft of the downstream transmission. A third planetary gearset element of the downstream transmission can be coupled by means of further interlocking shifting elements either to the transmission housing or to one of the other two planetary gearset elements.
Preferred further developments emerge from the description given below. Example embodiments of the invention, to which it is not limited, are explained in more detail with reference to the drawings, which show:
FIG. 1: A layout of a powershift transmission according to the invention;
FIG. 2: A first shifting matrix for the powershift transmission of FIG. 1;
The present invention concerns a powershift transmission for a motor vehicle, as well as methods for its operation.
FIG. 1 shows a schematic representation of a powershift transmission 1 which comprises a main transmission 2 in the form of a dual-clutch transmission and a downstream transmission 3 in the form of a planetary gearset connected downstream from the main transmission 2.
The powershift transmission 1 has a drive input shaft 4 and a drive output shaft 5. A drive aggregate of the motor vehicle can be coupled to the drive input shaft 4. A drive output of the motor vehicle can be coupled to the drive output shaft 5.