Transmission of vehicle, powertrain, and vehicle with improved oil flow mechanism

A powertrain, comprising:

• an engine;
• a power generator, the power generator being connected to the engine in a transmission manner;
• a driving motor;
• and
• a transmission of a vehicle comprising:
• a housing, an isolation board being arranged in the housing, a driving cavity being provided on a side of the isolation board, and a power generation cavity being provided on the other side of the isolation board;
• a one-way oil channel, the one-way oil channel being located at a top of the driving cavity and the power generation cavity, and the one-way oil channel being configured to guide oil from the driving cavity to the power generation cavity in a unidirectional manner;
• an oil drain mechanism, the oil drain mechanism being arranged at a bottom of the power generation cavity, and the oil drain mechanism being configured to drain oil in the power generation cavity to the driving cavity when the oil in the power generation cavity exceeds a preset amount;
• and
• a power generation driving assembly, the power generation driving assembly comprising:
• an engine input shaft, one end of the engine input shaft being configured to connect to an engine, and the engine input shaft being at least partially arranged in the power generation cavity;
• a power generator shaft, one end of the power generator shaft being configured to connect to a power generator, and the power generator shaft being at least partially arranged in the power generation cavity;
• and
• a third transmission gear pair, the third transmission gear pair being arranged between the engine input shaft and the power generator shaft,
• wherein the third transmission gear pair comprises:
• an engine input gear, wherein the engine input gear is arranged on the engine input shaft and located in the power generation cavity;
• and
• a power generator input gear, wherein the power generator input gear is arranged on the power generator input shaft and meshes with the engine input gear,
• wherein in a height direction, a central axis of the power generator input gear is higher than a central axis of the engine input gear.