Since I was specifically talking about Toyota hybrid, let me elaborate…
The gas engine has a timing chain and chain-driven oil pump. Everything else runs off the DC-DC converter.
The transmission is two motor-generators and an ICE directly connected by fixed gearing. This is used to start the engine.
The ICE in a hybrid doesn’t need any accessories beyond what the electric drivetrain already provides. Therefore, it does not have a starter or alternator.
There are a lot fewer moving parts that can break or wear out.
It’s a pretty elegant system that bolts a bare ICE to what is otherwise an electric car.
The gas engine has a timing chain and chain-driven oil pump. Everything else runs off the DC-DC converter.
The transmission is two motor-generators and an ICE directly connected by fixed gearing. This is used to start the engine.
The ICE in a hybrid doesn’t need any accessories beyond what the electric drivetrain already provides. Therefore, it does not have a starter or alternator.
There are a lot fewer moving parts that can break or wear out.
It’s a pretty elegant system that bolts a bare ICE to what is otherwise an electric car.