Drive System and Method for Changing Driving Ranges of the Drive System
AssigneeRobert Bosch GmbH
InventorsSteffen Mutschler, Andreas Nicola
Life of this patent
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Abstract
A drive system includes a first power branch and a second power branch. The first power branch includes a continuously variable transmission unit. The first power branch and the second power branch are connected by means of a summation gear. The summation gear includes a first, a second, and a third gear element. An output shaft of the continuously variable transmission unit is rotationally fixed to the first gear element. The second drive element can be connected to the output shaft of the first power branch. The third gear element is rotationally fixed to a mechanical transmission branch of the second power branch.
Claims15
A drive system comprising:
- a first power branch which has an infinitely adjustable transmission unit;
- and
- a second power branch,
- wherein the first power branch and the second power branch are connected to a summing transmission which has (i) a first transmission element which is connected in a rotationally fixed manner to an output shaft of the adjustable transmission unit, (ii) a second transmission element which can be connected in a rotationally fixed manner to the adjustable transmission unit, and (iii) a third transmission element (21),
- wherein the second power branch is a mechanical transmission branch with different fixed transmission ratios which can be selected via clutches, and
- wherein an output shaft of the second power branch is connected in a rotationally fixed manner to the third transmission element.
A method for changing driving ranges of a drive system including a first power branch which has an infinitely adjustable transmission unit and a second power branch, the first power branch and the second power branch being connected to a summing transmission which has (i) a first transmission element which is connected in a rotationally fixed manner to an output shaft of the adjustable transmission unit, has (ii) a second transmission element which can be connected in a rotationally fixed manner to the adjustable transmission unit, and (iii) a third transmission element, the second power branch being a mechanical transmission branch with different transmission ratios which can be selected via clutches, and an output shaft of the second power branch being connected in a rotationally fixed manner to the third transmission element, the method comprising:
- increasing a transmission ratio of the adjustable transmission unit in a first driving range in the case of a produced connection of the output shaft of the adjustable transmission unit to the second transmission element until a rotational speed ratio of the output shaft of the mechanical transmission branch to an input shaft of the mechanical transmission branch is reached, which rotational speed ratio corresponds to the transmission ratio of the mechanical transmission branch in the second driving range to be set;
- disconnecting of a connection of the output shaft of the adjustable transmission unit to the second transmission element and connecting an input shaft of the mechanical transmission branch to the output shaft of the mechanical transmission branch via a first transmission stage to the third transmission element, which transmission stage defines a second driving range to be set;
- and
- disconnecting of the connection of the output shaft of the mechanical transmission branch to the input shaft of the mechanical transmission branch via the first transmission stage and connecting of the output shaft of the mechanical transmission branch to the input shaft of the mechanical transmission branch via a second transmission stage which defines a third driving range, for changing from the second into the third driving range.
Dependencies are inferred from the claim text.