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US 7,731,617 B2Granted
Automated motor vehicle transmission and method of operating the same
AssigneeDaimler AG
InventorsCarsten Gitt, Detlef Schnitzer
Life of this patent
Estimating the term…
Abstract
In a transmission for a motor vehicle of a reduction gearing design with power branching including a main shaft and a counter shaft, a first component transmission and a planetary gear unit, power is branched to the countershaft by the first component transmission in certain gears and recombined via the planetary gear unit and a direct power transmission path is provided wherein the countershaft is decoupled selectively by means of a control device.
Claims17
An automated shift transmission for a motor vehicle having a plurality of discrete transmission stages, comprising
- a) a first component transmission (11) of a reduction gearing design, and
- b) a further component transmission (12) which has a trans-mission stage with a plurality of transmission elements forming drive elements or output elements (sunwheel 41;
- planet wheel 42;
- internal gearwheel 45;
- web 43), wherein
- c) for at least one gear (1st to 7th gear) power is transmitted via a single power path, and
- d) for at least one gear (8th to 12th gear) in the first component transmission (11) power branching between at least two power paths takes place and both power paths are combined in the further component transmission (12),
- e) the first component transmission (11) having output gear-wheels (36-39) adapted to be connected to a transmission shaft (output shaft 25) via gear shifting elements (40, 46), wherein the transmission shaft (output shaft 25) can be connected via a gear shifting element (40) to a trans-mission element (sun wheel 41) of the further component transmission (12) and can be connected via a further gear shifting element (46) to another transmission element (internal gearwheel 45) of the further component transmission (12), and
- f) a gear shifting element (40), which
- in a first shifted state (40-I) couples a transmission element (sun wheel 41) of the further component transmission (12) to the transmission input shaft (14),
- in a second shifted state (40-II) couples the transmission input, shaft (14) both to the transmission element (sun wheel 41) of the further component transmission (12) and to another transmission element (internal gearwheel 45) of the further component transmission (12), and
- in a third shifted state (40-III) couples the transmission element (sun wheel 41) of the further component transmission (12) to another transmission element (internal gear-wheel 45) of the further component transmission (12) for causing the transmission element components to rotate in unison.
9 more elements
An automated shift transmission for a motor vehicle having a plurality of discrete transmission stages, comprising
- a) a first component transmission (11) of a reduction gearing design, and
- b) a further component transmission (12) which has a trans-mission stage with a plurality of transmission elements forming drive elements or output elements (sun wheel 41;
- planet wheel 42;
- internal gearwheel 45;
- web 43), wherein
- c) for at least one gear (1st to 7th gear) power is transmitted via a single power path, and
- d) for at least one gear (8th to 12th gear) in the first component transmission (11) power branching between two power paths takes place and both power paths are combined in the further component transmission (12),
- e) a transmission input shaft (14) and a countershaft (15), with first and second input constants (17, 18) are intermediately connected between the transmission input shaft (14) and the countershaft (15), and
- f) a control device (60) is provided which, in a direct gear, depending on the operating conditions
- fa) couples the transmission input shaft (14) to the countershaft (15) by means of a shifting element (16) having opposite shifting positions via the first input constant (17) in one shifted position (16-I) of the gear shifting element (16), and
- fb) couples the transmission input shaft (14) to the countershaft (15) by means of the second input constant (17) in the opposite shifted position (16-III) of the gear shifting element (16).
8 more elements
Dependencies are inferred from the claim text.