초록 ▼

Pitch control linkage for the upper rotor of coaxial counterrotating rotors utilizes conventional swashplate, control rod and servomotor elements for changing blade pitch but without the conventional rotating and non-rotating scissors for reacting swashplate torque. This is accomplished by the use o

Pitch control linkage for the upper rotor of coaxial counterrotating rotors utilizes conventional swashplate, control rod and servomotor elements for changing blade pitch but without the conventional rotating and non-rotating scissors for reacting swashplate torque. This is accomplished by the use of rotating and non-rotating walking beams and combination torque reacting control rods between the walking beams and the rotatable and non-rotatable swashplate elements. Means are also disclosed for shimming the rotatable walking beams to achieve pre-track adjustment of the pitch of individual blades.

대표청구항 ▼

In a helicopter, an upstanding rotor having a drive shaft, a rotor hub mounted at the upper end of said shaft, an axial passage extended through said shaft and into said hub, a variable pitch blade rotatable by said shaft having a spindle extended into said passage, a pitch control horn mounted on t

In a helicopter, an upstanding rotor having a drive shaft, a rotor hub mounted at the upper end of said shaft, an axial passage extended through said shaft and into said hub, a variable pitch blade rotatable by said shaft having a spindle extended into said passage, a pitch control horn mounted on the end of said spindle within said passage, and means for controlling the pitch of said blade including a swashplate having rotatable and non-rotatable elements, a member rotatable by said drive shaft adjacent the lower end of the latter, a first pitch control link having a torque transmitting bearing in said rotatable member, a second link extended through said passage connecting said first link to said blade horn, and a third link having means connecting it to said first link and to said rotatable swashplate element for transmitting the rotary movement of said first link to said rotatable element.