Braking device

A braking device comprising:

• an outer race having a cylindrical inner peripheral surface;
• three brake cams provided radially inward of the outer race and arranged in a circumferential direction, each brake cam having a pair of protruding portions protruding radially outward and distanced from each other in the circumferential direction, a pair of brake surfaces respectively provided on the pair of protruding portions, and a cam surface facing radially inward and gradually changing a distance from a central axis of the inner peripheral surface, the brake surfaces being located opposite the inner peripheral surface and contactable with the inner peripheral surface;
• and
• an output-side rotating member disposed radially inward of the brake cams,
• wherein the output-side rotating member has abutting portions abuttable on the cam surfaces,
• wherein the braking device is configured such that:
• when a first rotation torque is applied to the brake cams, the cam surfaces push the abutting portions to rotate the output-side rotating member, and
• when a second rotation torque is applied to the output-side rotating member, the brake cams are not allowed to rotate in at least one rotational direction by the abutting portions pushing the cam surfaces to cause the brake surfaces to be pressed against the inner peripheral surface of the outer race,
• wherein at least one urging member is provided between at least one pair of the brake cams among the three brake cams so as to urge the pair of the brake cams to be separated from each other, and
• wherein when a third rotation torque is applied to the output-side rotating member, the pair of brake surfaces are pressed in contact with the inner peripheral surface at the same time.

A braking device comprising:

• an outer race having a cylindrical inner peripheral surface;
• three brake cams provided radially inward of the outer race and arranged in a circumferential direction, each brake cam having a brake surface located opposite the inner peripheral surface and contactable with the inner peripheral surface and a cam surface facing radially inward and gradually changing a distance from a central axis of the inner peripheral surface;
• and
• an output-side rotating member disposed radially inward of the brake cams,
• wherein the output-side rotating member has abutting portions abuttable on the cam surfaces,
• the braking device is configured such that:
• when a first rotation torque is applied to the brake cams, the cam surfaces push the abutting portions to rotate the output-side rotating member, and
• when a second rotation torque is applied to the output-side rotating member, the brake cams are not allowed to rotate in at least one rotational direction by the abutting portions pushing the cam surfaces to cause the brake surfaces to be pressed against the inner peripheral surface of the outer race, and
• an urging member is provided between only one pair of the brake cams among the three brake cams so as to urge the pair of the brake cams to be separated from each other.