PYLON MOUNTING SYSTEM FOR REDUCING HELICOPTER VIBRATION

摘要

A mounting for a helicopter pylon has resilient vertical support links (24-27) between the pylon (12) and the helicopter fuselage (13). The links have a composite spring rate which establishes a resilient support for the fuselage at the at thrust required to support said fuselage in normal flight and in which oscillatory vertical force transmitted to fuselage is minimal for acceptable static deflections of the pylon. Stops limit deflection between pylon and fuselage. Links (24, 25 etc.) are mounted at the ends of a pair of rigid beams (20, 21 and 22, 23) secured at their centres to the transmission portion of the pylon (12). A vertical pin (24b) extends downward at the end of each beam into a respective hollow receptacle (24a) secured to the fuselage and having a reentrant bore (Fig. 5, not shown) providing a down facing shoulder. A resilient body (24g) couples each pin to its receptacle. An enlarged foot on each pin operates between the fuselage and shoulder to limit deflection of pylon and the resilient coupling. There may be anti-torque links (32, 33). The pylon may include two engines (Figs. 8-10, not shown). IMAGE