Power transmission path switching device and two-stage transmission

A power transmission path switching device, comprising:

• a friction engaging device comprising at least one each of a friction plate and a separation plate that are supported so as to be able to displace in an axial direction relative to each other, and configured so as to be connected by pressing the friction plate and the separation plate against each other, and to be disconnected by releasing a force pressing the friction plate and the separation plate against each other;
• a rotation transmission state switching device comprising a first member and a second member arranged coaxial with each other, and having:
• at least one mode of a free mode in which, regardless of a relative rotational direction of the first member and the second member, rotation of the first member with respect to the second member is allowed;
• and a one-way clutch mode in which rotation of the first member with respect to the second member is allowed in only a specified direction, and rotation of the first member with respect to the second member in a direction opposite to the specified direction is prevented;
• and
• a lock mode in which, regardless of a relative rotational direction of the first member and the second member, rotation of the first member with respect to the second member is prevented;
• and
• a control device that, when connecting the friction engaging device and setting the rotation transmission state switching device to the lock mode, has a function of connecting the friction engaging device, and then while maintaining the friction engaging device in a connected state, switches the rotation transmission state switching device to the lock mode.