The recirculating planetary roller screw mechanism(RPRSM)is a transmission mechanism that engages the screw and nut threaded by multiple grooved rollers.In this paper,firstly,the design method of RPRSM nut threadless area is proposed,and the equations related to the structural parameters of nut threadless area are derived.On this basis,the cross-section design method of roller,screw and nut is constructed according to the actual situation of engage-ments between the screw/nut and the roller.By adjusting the gap between the two beveled edges and that between the arc and the beveled edge,the accuracy of the thread engagements between the screw/nut and the roller can be improved.Secondly,to ensure the engagements of the screw/nut and the roller,the distance equation from the center surface of the different rollers to the end surface of cam ring is given.Thirdly,combined with the working principle and structural composition of RPRSM,the component model is established according to its relevant struc-tural parameters,and the virtual assembly is completed.Finally,the 3D model is imported into the ADAMS simula-tion software for multi-rigid body dynamics.The dynamic characteristic is analyzed,and the simulated values are compared with the theoretical values.The results show that the contact forces between the screw/nut and the roller are sinusoidal,mainly due to the existence of a small gap between the roller and the carrier.The maximum collision forces between the roller and cam ring are independent from load magnitude.Normally,the collision force between the roller and the carrier increases as the load increases.When RPRSM is in the transmission process,the roller angular speed in nut threadless area begins to appear abruptly,and the position of the maximum change is at the contact between the roller and the convex platform of cam ring.The design of the nut threadless area and the proposed virtual assembly method can provide a theoretical guidance for RPRSM research,as well as a reference for overall performance optimization.

Guan Qiao;Rong Liao;Shijie Guo;Zhenghong Shi;Shangjun Ma

Inner Mongolia Key Laboratory of Advanced Manufacturing Technology,Inner Mongolia University of Technology,Hohhot 010051,China;University of Cincinnati,Cincinnati,OH 45221,USA;Shaanxi Engineering Labora-tory for Transmissions and Controls,Northwestern Polytechnical University,Xi'an 710072,China

中国机械工程学报

[1]Guan Qiao;Rong Liao;Shijie Guo;Zhenghong Shi;Shangjun Ma-.Design and Dynamic Analysis of the Recirculating Planetary Roller Screw Mechanism)[J].中国机械工程学报,2022(04):97-112

Screw,recirculating,RPRSM,threadless,beveled

Design,Dynamic,Analysis,Recirculating,Planetary,Roller,Mechanism,planetary,screw,mechanism,transmission,that,engages,nut,threaded,by,multiple,grooved,rollers,In,this,paper,firstly,design,method,area,proposed,equations,related,structural,parameters,derived,On,basis,cross,section,constructed,according,actual,situation,between,By,adjusting,gap,two,edges,accuracy,engagements,can,improved,Secondly,ensure,distance,from,center,surface,different,cam,ring,given,Thirdly,combined,working,principle,composition,component,model,established,its,relevant,virtual,assembly,completed,Finally,imported,into,ADAMS,software,rigid,body,dynamics,characteristic,analyzed,simulated,values,compared,theoretical,results,show,contact,forces,sinusoidal,mainly,due,existence,small,carrier,maximum,collision,independent,load,magnitude,Normally,increases,When,process,angular,speed,begins,appear,abruptly,change,convex,platform,provide,guidance,research,well,reference,overall,performance,optimization

0.395181