起落架可折撑杆下位上锁弹簧设计

Landing Gear Deployable System Down Lock Spring Design

在典型起落架撑杆锁中,起落架放下后,在上锁弹簧的辅助下,由撑杆锁机构将其锁定在放下位置。撑杆锁机构是通过挠度和机构限位的四连杆机构。撑杆锁的可靠性决定了起落架在承受外载时的稳定性,是整个起落架设计中重要的一环,而撑杆锁机构中锁功能完全靠锁弹簧来保证,因此对撑杆锁弹簧进行优化设计是十分必要的。通过对撑杆锁现有机构进行受力承载分析,核算出一套锁弹簧力值的计算公式。以某型飞机为例,依照此公式设计出锁弹簧,并通过LMSVirtualLab13.6对起落架进行动力学计算,得到撑杆锁开锁力,该力可用于下位开锁作动筒设计。

In typical landing gear side stay lock mechanisms,the deployment and locking of landing gears are assisted by down lock springs.Side stay lock mechanisms are 4-bar mechanisms which consider overcenter linkage and position limiting.Since the reliability of side stay locks determines the stability of the landing gear under external load,and the function of side stay locks are ensured by down lock springs,the design of down lock springs is important.Force distribution of an existing side stay mechanism is analyzed,taking a certain aircraft as an example,a down lock spring is designed consequently.The dynamics of the landing gear is calculated by LMS Virtual Lab 13.6,and the unlocking force of the lock stay is obtained,this force can be used in the design of lock opening actuators.