Damper configurations for a hybrid vehicle powertrain having a motor coupled between an engine and a transmission with a one-way clutch coupling the engine to the transmission

A powertrain system comprising:

• a flex plate configured to be connected to a crankshaft of an engine;
• a transmission input shaft;
• a torque coupling connecting the transmission input shaft to the flex plate while allowing slip between the transmission input shaft and the flex plate;
• a one-way clutch configured to couple the flex olate to the torque coupling, wherein the one-way clutch:
• transfers torque from the flex plate to the torque coupling in a first direction;
• and
• does not transfer torque from the torque coupling to the flex plate in a second direction that is opposite than the first direction;
• a first damper assembly coupling the flex plate to the one-way clutch and configured to inhibit vibration transmission from the flex plate to the one-way clutch;
• and
• a friction clutch connected to the flex plate and the torque coupling in parallel with the one-way clutch and configured to couple the flex plate to the torque coupling when the friction clutch is engaged.

A powertrain system comprising:

• a flex plate configured to be connected to a crankshaft of an engine;
• a transmission input shaft;
• a torque converter connecting the transmission input shaft to the flex plate and including a pump and a turbine that is hydraulically coupled to the pump;
• a motor-generator connected to the pump of the torque converter;
• a one-way clutch configured to couple the flex plate to the torque converter and a damper assembly coupling the pump of the torque converter to the transmission input shaft and configured to inhibit vibration transmission from the pump to the transmission input shaft, wherein:
• the one-way clutch is a selectable one-way clutch;
• the selectable one-way clutch is actuatable between a first configuration and a second configuration;
• in the first configuration, the selectable one-way clutch transfers torque from the flex plate to the torque converter in a first direction and does not transfer torque from the torque converter to the flex plate in a second direction that is opposite than the first direction;
• and
• in the second configuration, the selectable one-way clutch transfers torque from the flex plate to the torque converter in the first direction and transfers torque from the torque converter to the flex plate in the second direction.