CVT transmission
AssigneeSchaeffler Technologies AG & Co. KG
InventorBernhard Walter
Life of this patent
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Abstract
A CVT transmission having an input drive, a continuously variable variator, a sub-transmission to achieve at least two operating ranges (low and high) each with continuously variable gear ratios, and having a direct-shift stage for switching between a first operating range (low) and a second operating range (high) with continuously variable gear ratios. For the first operating range (low) the sub-transmission includes a non-positive clutch, such as a friction clutch, and for the second operating range (high) it includes a positive clutch, such s a jaw clutch.
Claims11
A CVT transmission comprising:
- an input drive;
- a continuously variable variator;
- and
- a sub-transmission having a low operating range and a high operating range with continuously variable gear ratios;
- wherein the sub-transmission in the low operating range includes a friction clutch, and in the high operating range includes a jaw clutch.
A method for operating a CVT transmission having an input drive, a continuously variable variator, and a sub-transmission comprising:
- switching from a first operating range to a second operating range of the sub-transmission, wherein the first operating range is achieved using a friction clutch and the second operating range is achieved using a jaw clutch;
- and
- selectively coupling, via a direct-shift stage, the input drive to an output independently of a start-up element, wherein the direct-shift stage includes a jaw clutch.
Dependencies are inferred from the claim text.