Hinged component and mechanical system comprising such a component

A hinged component with one degree of freedom, comprising three concentric rings, rotatable with respect to one other about a central axis, defining two friction interfaces therebetween, and including:

• an outer ring having an inner friction surface,
• an inner ring having an outer friction surface and an inner friction surface provided to receive a movable element guided by the component in rotation, oscillation and/or translation, and
• an intermediate ring located between the outer and inner rings;
• a first friction interface being defined between the intermediate ring and the outer ring, a second friction interface being defined between the intermediate ring and the inner ring, the component having therefore five friction surfaces including the inner friction surface of the outer ring, the inner friction surface of the inner ring and the outer friction surface of the inner ring,
• the first and second friction interfaces between the outer, inner and intermediate rings receiving a lubricant and at least one of the friction surfaces comprises arrangements capable of acting as a reserve of lubricant;
• wherein:
• the component comprises a seal on opposite sides of the component arranged to prevent leaks of lubricant out of the first friction interface.