Rotor hub assembly

Claim 1

IN COMBINATION WITH THE UPWARDLY EXTENDING ROTOR COLUMN OF A ROTARY WING AIRCRAFT, A ROTOR HUB ASSEMBLY INCLUDING A SPINDLE CONNECTED WITH SAID COLUMN SO AS TO BE ROTATABLY DRIVEN THERETHROUGH ABOUT A GENERALLY VERTICAL SPIN AXIS AND BEING PIVOTALLY SUPPORTED WITH RESPECT TO SAID COLUMN FOR TEETERING MOVEMENTS ABOUT A GENERALLY HORIZONTAL AXIS, SAID SPINDLE BEING PROVIDED WITH A PLURALITY OF OUTWARDLY EXTENDING SPINDLE SHAFTS SPACED ANGULARLY FROM EACH OTHER AND DEFINING PITCH-CONTROL AXES HAVING A GENERALLY HORIZONTAL DISPOSITION, EACH OF SAID SPINDLE NSHAFTS BEING EQUIPPED WITH A SINGLE JOURNAL BEARING ASSEMBLY AND WITH A THRUST BEARING ASSEMBLY SPACED AXIALLY FROM THE JOURNAL BEARING ASSEMBLY ALONG THE ASSOCIATED PITCH-CONTROL AXIS, EACH OF SAID SPINDLE SHAFT HAVING A SECTION ENLARGED DIAMETER ADJACENT THE INNER END THEREOF AND A SECTION OF REDUCED DIAMETER ADJACENT ITS OUTER END AND BEING EQUIPPED WITH AN OUTWARDLY FACING INNER ABUTMENT SHOULDER ADJACENT AND BEING EQUIPPED OF SAID SECTION OF ENLARGED DIAMETER AND BEING EQUIPPED ALSO WITH AN OUTWARDLY FACING OUTER ABUTMENT SHOULDER ADJACENT THE INNER END PORTION OF SAID SECTION OF REDUCED DIAMETER, EACH OF SAID THRUST BEARING ASSEMBLIES INCLUDING A PLURALITY OF BEARING STRUCTURES ONE OF WHICH HAS AN INNER SEGMENTED RACE AND BEING MOUNTED UPON SAID SECTION OF ENLARGED DIAMETER OF THE ASSOCIATED SPINDLE SHAFT AND BEING CONSTRAINED AGAINST AXIAL MOVEMENT THEREALONG IN AN INWARD DIRECTION BY ABUTMENT WITH SAID INNER SHOULDER THEREOF, STOP STRUCTURE SELECTIVELY ADJUSTABLE FOR EACH SPINDLE SHAFT AND BEING REMOVABLE MOUNTED UPON THE ASSO-