Patent ID: 11873869
Assignee: ORIGIN COMPANY, LIMITED
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. An angular position holding apparatus for applying a braking torque to hold a position of an output-side device when no rotation torque is input from an input-side device, the angular position holding apparatus comprising:
an outer race member and an inner race member each rotatable about a common central axis and each having an outer peripheral surface with a circular cross section, one of the outer race member or the inner race member being connectable to the input-side device and another of the outer race member or the inner race member being connectable to the output-side device; and
a coil spring mounted on the outer peripheral surface of the outer race member, the coil spring in a free state having an inner diameter smaller than an outer diameter of the outer race member, and the coil spring having hooks at both ends that are locked to a fixed member in order to apply braking torque to the outer race member, wherein
an internal space having a circular cross section to accommodate the inner race member is formed in the outer race member, and a cylindrically-rolled thin-plate elastic piece is installed between an inner peripheral surface of the outer race member and the outer peripheral surface of the inner race member so that the cylindrically-rolled thin-plate elastic piece is brought into contact with the inner peripheral surface of the outer race member and the outer peripheral surface of the inner race member,
the outer race member and the inner race member rotate integrally against the braking torque when a rotation torque input from the input-side device is larger than the braking torque, and
connection by the cylindrically-rolled thin-plate elastic piece between the outer race member and the inner race member is cut off to make the outer race member and the inner race member rotate relatively when a rotation torque larger than the braking torque by at least a predetermined value is generated between the outer race member and the inner race member.