Methods and systems of a two speed countershaft transmission
AssigneeDana Belgium N.V.
InventorsJoachim Van Dingenen, Jan Markey
Life of this patent
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Abstract
Systems and methods for an electric transmission system are herein provided. The electric transmission system, in one example, comprises an electric motor driving an input shaft, a first wet clutch position on a first end of a countershaft, and a second wet clutch positioned on a second end of the input shaft. The first wet clutch selectively engages the countershaft with a first clutch gear and the second wet clutch selectively engages the input shaft with second clutch gear. The input shaft meshes with the second clutch gear and the countershaft meshes with the first clutch gear. The electric transmission system further comprises an output shaft rotationally coupled to the countershaft.
Claims19
A two-speed electrified transmission system, comprising:
- an electric motor driving an input shaft, wherein the input shaft is rotationally coupled to a first gear that meshes with a first clutch gear;
- a first wet clutch positioned on a first end of a countershaft to selectively engage the countershaft with the first clutch gear;
- a second wet clutch positioned on a second end of the input shaft to selectively engage the input shaft with a second clutch gear, wherein the input shaft meshes with the second clutch gear and the countershaft meshes with the first clutch gear;
- and
- an output shaft rotationally coupled to the countershaft.
A method of operation of a transmission system, comprising:
- powershifting between a first gear ratio and a second gear ratio via disengagement of a first wet friction clutch and engagement of a second wet friction clutch and vice versa, wherein the transmission system comprises:
- an electric motor rotationally coupled to an input shaft;
- a countershaft rotationally coupled to the input shaft;
- and
- an output shaft rotationally coupled to the countershaft, wherein the first wet friction clutch selectively engages the countershaft and the second wet friction clutch selectively engages the input shaft.
A multi-speed electric transmission system, comprising:
- an electric traction motor rotationally coupled to an input shaft;
- and
- an electric transmission comprising:
- a first wet clutch configured to selectively engage a countershaft;
- a second wet clutch configured to selectively engage the input shaft driven by the electric traction motor, wherein, in a first gear ratio, the first wet clutch is engaged and the second wet clutch is disengaged;
- and
- an output shaft rotationally coupled to the countershaft, wherein the first wet clutch, when engaged, rotationally couples the countershaft to the input shaft via a first gear, and the second wet clutch, when engaged, rotationally couples the input shaft to the countershaft via a second gear.
Dependencies are inferred from the claim text.