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A pitch adjustment assembly (100) for a bearingless rotor assembly (20) which includes a torque tube member (36) enveloping a flexbeam connector (22), which torque tube member (36) defines a geometric center (120) and is operative to impart pitch motion to the rotor blade assembly (20). The pitch ad

A pitch adjustment assembly (100) for a bearingless rotor assembly (20) which includes a torque tube member (36) enveloping a flexbeam connector (22), which torque tube member (36) defines a geometric center (120) and is operative to impart pitch motion to the rotor blade assembly (20). The pitch adjustment assembly (100) includes a centering bearing (70) for centering an inboard end (38) of the torque tube member (36) relative to the flexbeam connector (22), wherein the centering bearing (70) defines a torque tube pivot point (110) about which the torque tube member (36) is rotationally displaced relative to the flexbeam connector (22), a pitch control rod (48) mechanically connecting to a pitch control arm (46) for imparting pitch control inputs to the torque tube member (36); wherein the pitch control rod and arm (46, 48) define an input pivot point (116) and, a displacement mechanism (102 or 140), in combination with the centering bearing (70), for effecting translational displacement of the geometric center (120) of the torque tube member (36) relative to the torque tube and input pivot points (110, 116). The displacement mechanism (102 or 140) cooperates with the centering bearing (70) to effect translational displacement of the torque tube inboard end (38) while maintaining the spatial position of the input pivot point (116) relative to the torque tube pivot point (110). Adjustment shims (102) or a jacking arrangement (140) is used to effect the translational displacement of the torque tube member (36).

대표청구항 ▼

A pitch adjustment assembly (100) for a bearingless rotor assembly (10) having a rotor blade assembly (20) including a torque tube member (36) enveloping a flexbeam connector (22), the torque tube member (36) defining a geometric center (120) and being operative to impart pitch change motion to the

A pitch adjustment assembly (100) for a bearingless rotor assembly (10) having a rotor blade assembly (20) including a torque tube member (36) enveloping a flexbeam connector (22), the torque tube member (36) defining a geometric center (120) and being operative to impart pitch change motion to the rotor blade assembly (20), the pitch adjustment assembly (100) comprising: means (70) for centering an inboard end (38) of the torque tube member (36) relative to the flexbeam connector (22), said centering means (70) defining a torque tube pivot point (110) about which the torque tube member (36) is rotationally displaced relative to the flexbeam connector (22); means (46, 48) for imparting pitch control inputs to the torque tube member (36), said pitch control input means (46, 48) defining an input pivot point (116); said torque tube and input pivot points (110, 116) defining a pitch reference line (130); said input pivot point (116) and said geometric center (120) of the torque tube member (36) defining a pitch adjustment line (132); said reference and pitch lines (130, 132) forming a pitch angle qqa, 74b) mounting to the other end of the motion accommodating elastomer (76), each of said attachment fittings (74a, 74b) having an outer surface (152) and a peripheral bearing surface (148); upper and lower housing members (142a, 142b), each of said housing members (142a, 142b) mounting to the torque tube member (36) and having a pilot surface (146) for accepting and guiding one of said peripheral bearing surfaces (148) of said attachment fittings (74a, 74b); and, a jacking plate (144) disposed within each of said housing members (142a, 142b); said jacking plates engaging said outer surfaces (152) of said attachment fittings (74a, 74b) and being operative, in combination with said housing members (142a, 142b) to apply a compressive preload in the motion accommodating elastomer (76).