Motor assembly

A motor assembly comprising:

• a motor with a central axis extending in an axial direction;
• a housing including a housing space to house the motor;
• oil in a vertically lower region of the housing space;
• and
• an oil passage to lead the oil from the vertically lower region of the housing space through the motor to the vertically lower region of the housing space;
• wherein
• the housing space of the housing is divided into a motor chamber and a gear chamber by a partition;
• an oil pool is provided at a bottom portion of the gear chamber;
• a bottom portion of the motor chamber is vertically higher than the bottom portion of the gear chamber;
• the partition includes a partition opening;
• the oil passage includes an electric pump, a cooler, a first flow passage, a second flow passage, and a third flow passage;
• the first flow passage connects the oil pool and the electric pump to each other;
• the second flow passage connects the electric pump and the cooler to each other;
• the third flow passage connects the cooler and the motor chamber to each other;
• and
• the oil gathered at the bottom portion of the motor chamber travels into the oil pool through the partition opening.