Lockup clutch for powersplit hybrid transmission

Abstract

The invention provides a lockup clutch for powersplit hybrid transmission. A powertrain includes an engine and an electric machine. The powertrain further includes a planetary gearset including a first rotatable element fixedly coupled to an engine crankshaft, a second rotatable element fixedly coupled to the electric machine, and a third rotatable element driveably connected to an intermediate shaft. The powertrain further includes a lockup clutch configured to selectively couple two of the first rotatable element, the second rotatable element, and the third rotatable element.

Description

Technical field [0001] The present disclosure relates to the field of automatic transmissions for motor vehicles. More specifically, the present disclosure relates to the arrangement of gears, clutches, and motors in a power transmission device and the interconnection between them. Background technique [0002] Many vehicles are used in a wide range of vehicle speeds (including both forward motion and reverse motion). However, certain types of engines can only operate efficiently in a narrow speed range. Therefore, transmission devices capable of efficiently transmitting power at multiple speed ratios are frequently used. When the vehicle is at a low speed, the transmission usually runs at a high gear ratio, so that the transmission doubles the engine torque to improve acceleration. At high vehicle speeds, operating the transmission at a low gear ratio allows engine speeds associated with quiet, fuel-efficient cruise. Generally, the transmission device has a housing mounted t...

AI Technical Summary

Problems solved by technology

However, certain types of engines can only operate efficiently within a narrow speed range

Therefore, a transmission capable of efficiently transmitting power at a plurality of speed ratios is frequently used

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