Rotation transmission state switching device

A rotation transmission state switching device comprising:

• a clutch device;
• and a restriction device;
• the clutch device comprising:
• a first rotating member having a first-rotating-member-side engaging portion;
• a second rotating member having a second-rotating-member-side engaging portion arranged on an inside in a radial direction of the first-rotating-member-side engaging portion;
• a third rotating member having a third-rotating-member-side engaging portion on an inner circumferential surface thereof;
• an engaging element having an engaging-element-side first engaging portion that engages with the first-rotating-member-side engaging portion, an engaging-element-side second engaging portion that is provided on an inner side surface in the radial direction thereof and engages with the second-rotating-member-side engaging portion, and an engaging-element-side third engaging portion that is provided on an outer side surface in the radial direction thereof and engages with the third-rotating-member-side engaging portion;
• and
• a biasing member configured to elastically bias the engaging element in a direction in which the third-rotating-member-side engaging portion and the engaging-element-side third engaging portion engage with each other;
• the first-rotating-member-side engaging portion is arranged on an inside in the radial direction of the third-rotating-member-side engaging portion, and the second-rotating-member-side engaging portion is arranged on the inside in the radial direction of the third-rotating-member-side engaging portion;
• the restriction device being configured so as to be able to switch between a state where rotation of the first rotating member is allowed and a state where rotation of the first rotating member is restricted;
• and
• torque transmission between the second rotating member and the third rotating member being allowed by integrally rotating the first rotating member, the second rotating member, the third rotating member, and the engaging element when torque is inputted to the third rotating member in a state where rotation of the first rotating member is allowed by the restriction device, whereas torque transmission between the second rotating member and the third rotating member is not possible by the engaging-element-side third engaging portion of the engaging element moving in a direction away from the third-rotating-member-side engaging portion based on engagement between the engaging-element-side first engaging portion and the first-rotating-member-side engaging portion, and thus by surface pressure at a contact portion between the engaging-element-side third engaging portion and the third-rotating-member-side engaging portion being reduced or lost, when torque is inputted to the third rotating member in a state where rotation of the first rotating member is prevented by the restriction device.