Inboard bearing assemblies for proprotor systems

A tiltrotor aircraft having a helicopter flight mode and an airplane flight mode, the tiltrotor aircraft comprising:

• a fuselage;
• a wing extending from the fuselage having first and second outboard ends;
• first and second pylon assemblies respectively coupled to the wing proximate the first and second outboard ends;
• and
• first and second proprotor systems operably associated respectively with the first and second pylon assemblies, each proprotor system including:
• a yoke having a plurality of blade arms including a first blade arm having an inboard pocket and an outboard end;
• an outboard shear bearing coupled to the outboard end of the first blade arm;
• a bearing assembly disposed at least partially within the inboard pocket, the bearing assembly including an inboard shear bearing coupled to the yoke and a centrifugal force bearing coupled to the yoke;
• an inboard beam disposed at least partially between the centrifugal force bearing and the inboard shear bearing;
• and
• a proprotor blade coupled to the inboard beam such that the proprotor blade has a pitch change degree of freedom about a pitch change axis and a tilting degree of freedom about a focal point.