One-way clutch and driving device having the same

A one-way clutch comprising:

• a first rotation member that has a cylindrical shape, is a rotation member that is rotatable about a rotational shaft in a first direction and a second direction counter to the first direction, and includes an outer circumferential portion having gear teeth to which a rotational driving force is inputted from outside, an interior space formed inward in a diameter direction of the outer circumferential portion, a first lateral surface portion that is a lateral surface at one end side of the rotation member in an axial direction of the rotational shaft, and a second lateral surface portion that is a lateral surface at the other end side of the rotation member in the axial direction and has an opening portion providing an external opening for the interior space;
• a second rotation member that has a disk shape, is mounted on the second lateral surface portion of the first rotation member, is a rotation member rotatable in an integral manner with the rotational shaft, and includes a pivotal supporting portion inserted in the interior space to pivotally support the rotational shaft;
• a support shaft that is disposed in a protruding manner from the first lateral surface portion of the first rotation member toward the interior space in the axial direction of the rotational shaft;
• and
• a transmission member that is supported by the support shaft, and is movable in a sliding manner in the axial direction between a first position at which a rotational driving force in the first direction inputted to the first rotation member is transmitted to the second rotation member, and a second position at which a rotational driving force in the second direction inputted to the first rotation member is restricted from being transmitted to the second rotation member, wherein
• the second rotation member further includes a concaved portion that is formed as a partial concavity on the second rotation member so as to face the transmission member in the axial direction, and to which the transmission member is insertable;
• the transmission member, when being engaged with the concaved portion at the first position, is rotated integrally with the first rotation member and the second rotation member, and, when being detached from the concaved portion toward a side of the first lateral surface portion in the axial direction, is disposed at the second position to cause the first rotation member to slip with respect to the second rotation member;
• and
• a plurality of the support shafts, the transmission members, and the concaved portions are disposed along the circumferential direction.