Cancel cam structure and rotatable connector device

A cancel cam structure which includes a cam section for allowing a ratchet to be put into contact therewith, is located radially outer to an axial direction of a steering shaft, and is pivotable along with pivoting of a steering wheel connected to the steering shaft;

• wherein:
• the cam section includes:
• an outer circumferential cam wall for allowing the ratchet to slide thereon;
• an inner wall located radially inner to the outer circumferential cam wall;
• and
• a coupling cam wall for coupling ends of the outer circumferential cam wall and the inner wall;
• the outer circumferential cam wall, the inner wall, and the coupling cam wall are formed parallel to the axial direction;
• and an enclosed space is formed by the outer circumferential cam wall, the inner wall, and the coupling cam wall;
• at least one of the outer circumferential cam wall, the inner wall, and the coupling cam wall has a projection section projecting toward the enclosed space;
• the outer circumferential cam wall has an arc shape such that any cross-section thereof perpendicular to the axial direction is centered around an intersection of a central axis of the steering shaft and the cross-section, the arc shape having a certain diameter, and the outer circumferential cam wall extends uniformly in the axial direction;
• the inner wall has an arc shape such that any cross-section thereof perpendicular to the axial direction is centered around an intersection of the central axis and the cross-section, the arc shape having a certain diameter smaller than the diameter of the outer circumferential cam wall, and the inner wall extends uniformly in the axial direction;
• the projection section is formed of a plurality of flat plate-like partition walls standing upright in the axial direction and being arranged at prescribed intervals, the partition walls dividing the enclosed space;
• and
• distances between the coupling cam wall and the partition wall adjacent thereto and between the partition walls adjacent thereto include at least two different distance values.