四位置刚体导引曲柄滑块机构的设计

Design Method for Crank-slider Mechanism with Four Position Rigid Body Guidance

通过作出布尔梅斯特圆心曲线、圆点曲线后,根据动力学要求γmin>40°～50°,对曲柄滑块机构进行了设计,求出拐点圆,并得出滑点、导路倾角、拐点圆之间的关系.滑块铰接点B1的位置与滑块导路倾角β有关,而拐点圆K1与滑块导路倾角β无关;设计时可适当调整滑块导路倾角β而拐点圆不变,则点B1位置在拐点圆K1上作出相应变化,以满足设计要求.对于计算实例,当A取值<-17时,不能得到圆心曲线上的点,与布尔梅斯特圆心曲线的理论相符合,即对于任意给定连杆平面四个相关位置,连杆运动平面上只能找到一些与之相应的圆心点.

The design method for crank-slider mechanism with four position rigid body guidance is given in this paper; After calculating center of a circle curve; dot curve for L.Burmester,the crank-slider mechanism is designed according to the dynamics γ_(min)>40°～50°; what obtained turns out the relations of sliding points, inclination angle of guidance function and turning point circle. There exist relations for hinge join point Bof the slider and inclination angle β of guidance direction ,but there exist no relations for turning point circle K and inclination angle β of guidance direction with slider.When designed ,the inclination angle β of guidance direction with slider may be adjusted and the position for point Bon the turning point circle K is changed, but the turning point circle K isn't changed. So it is contented for designing requirement. For example in this article , points on the center of a circle can't be obtained when value A<-1.7. This agrees with center of a circle curve theories for L.Burmester. Only some points can be found on link bar moving planes, for four related positions on link bar moving planes are given arbitrarily.