For the four-bar beating-up mechanism of air-jet loom,the plain bearing of linkage is the bearing with dynamic load,and is immersed in the lubricant-box.If the joint clearance is considered,the research on linkage mov...For the four-bar beating-up mechanism of air-jet loom,the plain bearing of linkage is the bearing with dynamic load,and is immersed in the lubricant-box.If the joint clearance is considered,the research on linkage movement could be very complicated.In this paper,the kinematic characteristics of four-bar beating-up mechanism with joint clearance were studied by analyzing the trace of journal center and the balance of radial,tangential forces,and bearing load.The region of principal vibration and its forming causes were discussed.And the results could interpret the measuring curves of four-bar beating-up mechanism completely.展开更多
A 3D model of the spatial four-bar weft insertion mechanism was built with unigraphics NX(UG) according to the actual requirement,and dynamics simulation was carried out by importing the model into ADAMS.Without consi...A 3D model of the spatial four-bar weft insertion mechanism was built with unigraphics NX(UG) according to the actual requirement,and dynamics simulation was carried out by importing the model into ADAMS.Without considering the clearance,the motion characteristic curve of the sword belt was generated through ADAMS combined with MATLAB.In this paper the hinge between the rod and the sector gear was selected as an example with different values of clearance,outputting the motion characteristic curve of the sword belt.Finite element analysis(FEA)was conducted,the flexible body was generated by importing the forked frame into ANSYS,and flexible dynamics simulation was carried out by importing the flexible body into ADAMS to replace the rigid rod.A comprehensive comparison of the output characteristics of the sword belt was conducted in the consideration of the clearance or flexible.Analysis of the force on the left hinge of the rod was carried out with the ADAMS post processing module.With the same clearance,considering the flexibility,amplitude of fluctuation of the force on the hinge increased obviously.展开更多
As one of transmission mechanisms,continuously variable transmission(CVT)can transfer energy depending upon rotation speed or torque generated by rotation power transferred from input axis to output axis.It is known t...As one of transmission mechanisms,continuously variable transmission(CVT)can transfer energy depending upon rotation speed or torque generated by rotation power transferred from input axis to output axis.It is known that the CVT is mechanism that can change gear ratios continuously in power transmission installed in vehicles,or power generation and its transfer systems.In this paper,we propose a CVT using a new type of mechanism in which four-bar linkages(quadric crank chains)and non-invertible elements such as one-way clutches or ratchets are installed.The conventional CVTs which are classified as belt-type CVTs or toroidal CVTs are driven by friction force between conduction mechanisms.Due to slippage or high-pressure between the transmission components in the conduction mechanism,the transfer efficiency in the conduction energy becomes inferior.However,the proposed CVT does not depend upon any friction forces,and it is considered that its transfer efficiency is superior.展开更多
文摘For the four-bar beating-up mechanism of air-jet loom,the plain bearing of linkage is the bearing with dynamic load,and is immersed in the lubricant-box.If the joint clearance is considered,the research on linkage movement could be very complicated.In this paper,the kinematic characteristics of four-bar beating-up mechanism with joint clearance were studied by analyzing the trace of journal center and the balance of radial,tangential forces,and bearing load.The region of principal vibration and its forming causes were discussed.And the results could interpret the measuring curves of four-bar beating-up mechanism completely.
基金National Natural Science Foundation of China(No.51175475)Natural Science Foundation of Zhejiang Province,China(No.LY14E050027)
文摘A 3D model of the spatial four-bar weft insertion mechanism was built with unigraphics NX(UG) according to the actual requirement,and dynamics simulation was carried out by importing the model into ADAMS.Without considering the clearance,the motion characteristic curve of the sword belt was generated through ADAMS combined with MATLAB.In this paper the hinge between the rod and the sector gear was selected as an example with different values of clearance,outputting the motion characteristic curve of the sword belt.Finite element analysis(FEA)was conducted,the flexible body was generated by importing the forked frame into ANSYS,and flexible dynamics simulation was carried out by importing the flexible body into ADAMS to replace the rigid rod.A comprehensive comparison of the output characteristics of the sword belt was conducted in the consideration of the clearance or flexible.Analysis of the force on the left hinge of the rod was carried out with the ADAMS post processing module.With the same clearance,considering the flexibility,amplitude of fluctuation of the force on the hinge increased obviously.
文摘As one of transmission mechanisms,continuously variable transmission(CVT)can transfer energy depending upon rotation speed or torque generated by rotation power transferred from input axis to output axis.It is known that the CVT is mechanism that can change gear ratios continuously in power transmission installed in vehicles,or power generation and its transfer systems.In this paper,we propose a CVT using a new type of mechanism in which four-bar linkages(quadric crank chains)and non-invertible elements such as one-way clutches or ratchets are installed.The conventional CVTs which are classified as belt-type CVTs or toroidal CVTs are driven by friction force between conduction mechanisms.Due to slippage or high-pressure between the transmission components in the conduction mechanism,the transfer efficiency in the conduction energy becomes inferior.However,the proposed CVT does not depend upon any friction forces,and it is considered that its transfer efficiency is superior.
