CVT transmission
AssigneeSchaeffler Technologies AG & Co. KG
InventorBernhard Walter
Life of this patent
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Abstract
A CVT transmission including a start-up element, a variator, and a direct-shift stage for switching between a first operating range (low) and a second operating range (high). A maximum transmission ratio of the second operating range (high) corresponds to a minimum transmission ratio of the first operating range (low). The transmission ratio ranges are arranged so that the marginal variator transmission ratio ranges, which constitute low-efficiency ranges, are not used.
Claims9
A continuously variable transmission (CVT transmission) comprising:
- a start-up element,
- a variator, and
- a direct-shift stage for switching between a first operating range and a second operating range,
- wherein a maximum transmission ratio of the second operating range corresponds with a minimum transmission ratio of the first operating range, and
- wherein a closing valve is operatively connected to a variator fluid system so that the variator fluid system is closed fluid-tight by the closing valve when the direct-shift stage is in operation, with the variator uncoupled, for propulsion.
A method for operating a continuously variable transmission (CVT transmission), comprising:
- using a start-up element as a control element against drive train locking when switching to a direct-shift stage configured for switching between a first operating range and a second operating range,
- wherein a closing valve is operatively connected to a variator fluid system so that a variator fluid system is closed fluid-tight by the closing valve when the direct-shift stage is in operation, with a variator uncoupled, for propulsion.
Dependencies are inferred from the claim text.