用于单驱动电动开启门锁保险支链的双层柔顺间歇机构

Double-layer Compliant Intermittent Mechanism for Single-drive Electric Opening Latch Safety Branch Chain

针对汽车门锁单电机驱动实现电动开启及电动保险功能的需求,基于恒力弹簧弹性力不随行程变化而改变的特性,构造了协同电动开启和电动保险支链运动的新型双层柔顺间歇机构。正向驱动组件由撑杆通过杠杆支撑刚化拨杆拨动型面拨盘;反向驱动组件由拨杆受拨盘扭簧力阻力作用与撑杆脱离,拨杆绕杠杆中心旋转,顺应拨盘型面滚滑。该机构有初始支撑保持、刚性支撑拨动及柔顺避让适应型面多种运动模式,正反向转动实现双层多运动模式切换。该机构在门锁狭小空间内仿真,可实现多工况下开启机构与保险机构的确定运动与复位运动;比较拨杆与保险盘的接触力,使用恒力弹簧时最大值较小且变化幅度平稳,满足与其他支链兼容适应性。仿真结果表明,机构在30.8 ms内实现单独解保险,97 ms内顺序实现解保险及电动开启,68.9 ms内实现单独上保险。

To realize electric opening and electric lock with a single-motor drive in vehicle door latch,a double-layer compliant intermittent mechanism that can cooperate the movement of electric opening and elec⁃tric safety branch chains is constructed,based on the characteristic that the elastic force of the constant force spring does not change with the change of the stroke.The forward driving pin-unit is supported by a lever sup⁃port rigidized driving pin to move the type face turntable disk.The reverse driving pin-unit,the driving pin is disengaged from the support-level by the resistance of the turntable disk torsion spring,the driving pin rotates around the center and slides on the surface of the turntable disk.The mechanism has multiple movement modes including initial-support-maintenance,rigid-support-driving and compliant-avoidance adapted to the disk pro⁃file.Multi-mode switching of double-layer compliant intermittent mechanism can be realized by clockwise and anticlockwise rotation.The mechanism is simulated in the narrow space of the door latch,to realize the definite and reset movement of electric opening and lock mechanism under multi-working conditions.Comparing the contact force between the driving pin and the turntable disk,the maximum value is smaller and the change range is stable when using constant force spring,which realizes adaptability with other branch chains.The results show that,the mechanism can realize unlock in 30.8 ms,sequence unlock and electric opening in 97 ms,independent lock can be realized in 68.9 ms.