Clutch and vehicle motive power transmission structure

A clutch for selectively transmitting or interrupting torque between an input shaft and an output shaft, the clutch comprising:

• a dog clutch that transmits forward or reverse torque from the input shaft to the output shaft;
• and
• a friction clutch that is disposed in parallel with the dog clutch and adapted to transmit torque from the input shaft to the output shaft,
• wherein the dog clutch includes:
• a first member that is to be coupled to the output shaft and has a first surface,
• a second member that is to be coupled to the input shaft and has a second surface, the second surface opposing the first surface in an axial direction,
• a first engagement element that is disposed between the first surface and the second surface and adapted to not only interrupt the transmission of reverse torque from the second member to the first member, but also engage the first member with the second member to transmit forward torque from the second member to the first member,
• a second engagement element that is disposed between the first surface and the second surface, and adapted to not only interrupt the transmission of forward torque from the second member to the first member, but also engage the first member with the second member to transmit reverse torque from the second member to the first member,
• springs that respectively press the first engagement element and the second engagement element in the axial direction in which the first engagement element and the second engagement element become engaged, and
• a drive device that elastically deforms the springs so as to disable the first engagement element and the second engagement element from becoming engaged.