Motor unit

A motor unit comprising:

• a motor including a shaft to rotate about a motor axis extending in a horizontal direction and a stator surrounding the shaft from radially outside;
• a reduction gear connected to the shaft;
• and
• a housing including a housing space to house the motor and the reduction gear;
• wherein the housing space includes:
• a motor chamber to house the motor;
• and
• a gear chamber to house the reduction gear;
• the housing includes a partition to divide the motor chamber and the gear chamber;
• the shaft includes:
• a first shaft portion, a connecting shaft portion, and a second shaft portion arranged coaxially with one another;
• and
• a separating mechanism between the connecting shaft portion and the second shaft portion;
• the first shaft portion includes a first end portion extending through an insert hole defined in the partition from a side on which the motor chamber lies;
• the connecting shaft portion includes:
• a second end portion coupled to the first end portion;
• a third end portion on a side opposite to the second end portion;
• and
• a connection flange portion extending radially outward at the third end portion;
• the second shaft portion includes a fourth end portion on a side closer to the third end portion of the connecting shaft portion;
• the separating mechanism selectively separates the connection flange portion and the fourth end portion from each other;
• a first bearing is in a radial gap between the third end portion and the fourth end portion;
• the second shaft portion includes a fifth end portion on a side opposed to the fourth end portion, the fifth end portion being rotatably supported by a second bearing which is held by the housing;
• and
• the second shaft portion is directly supported by the first bearing and the second bearing at opposing ends of the second shaft portion in the horizontal direction.