基于球面四杆机构调控滚子偏置角的锥式Mecanum轮

Mecanum轮作为一种全方位行走轮在多领域广泛应用,针对Mecanum运动系统受限于平整光滑路面,提出一种拓展到类“V”形路面行走的新型变锥角Mecanum轮,该轮每个滚子分别对应安装于阵列球面四杆机构上,其周向阵列球面四杆机构具有公共输入轴,以同步驱动安装于连杆上对应的Mecanum轮滚子,实现滚子轴线偏置角变化,达到Mecanum轮锥角变化,增加Mecanum轮运动系统对“V”形地面行走适应性;通过建立球面四杆机构运动学模型,求解出球面四杆机构的输入输出方程,得到公共轴输入转动角度与滚子偏置角间映射关系;基于包络原理近似求得Meca num轮可控锥角所对应的路面坡度。

Conical Mecanum Wheel of Adjusting Roller Offset Angle based on Spherical Four-bar Mechanism

As a kind of omnidirectional walking wheel,Mecanum wheel is widely used in many fields,to solve the limitation of Mecanum motion system on smooth road surface,a new variable cone angle Mecanum wheel which can be extended to the V type road surface is proposed.Each roller of the wheel is installed on the four-bar mechanism with spherical arrays and four-bar mechanism with circumferential arrays.The mechanism has a common input shaft to synchronously drive the corresponding Mecanum roller mounted on the connecting rod to realize the change of the roller axis offset angle,to achieve the change of the Mecanum wheel cone angle,to increase the adaptability of the Mecanum wheel motion system to the V type ground walking.By establishing the spherical four-bar mechanism kinematics model,the input and output equations of the spherical four-bar mechanism are solved.The common axis input rotation angle and the mapping relationship between the offset an gles of the rollers are obtained.Finally,the slope of the road corresponding to the controllable cone angle of the Mecanum wheel,according to envelope principle,is approximated.