Study On Kinematics And Parameter Optimization Of Chain Transmission Based On Bidirectional Drive

Chain drive plays an important role in passing movement, which requires lowerInstallation precision and more accuracy in the transmission compared with gear drive andbelt drive, and is widely used in a variety of mechanical power transmission. But forlow-speed heavy-duty and the need to stabilize the transmission system, chain drive has adisadvantage of polygon effect. Polygon effect can make speed significant changes regularly,affect the stability of the transmission speed and increase wear and chain drive chain fracturefailure probability, and it may also be found in constrained chain drive on the track. Therefore,the study is to solve the polygon effect special track bi-driven chain drive and provide a newway of thinking and methods for polygon effect in future.The orbital radius, replacing the equivalent model, analytical method velocity analysis,the center of the track to fit the load position, two degrees of freedom five-bar mechanismsimulation methods and scanning points are used to analysis the structure and movement ofthe chain drive combine with the spatial position of the actual constraints of low-speed heavyrail constrained chain drive system. The research is as follows.(1)We first studied the effect of polygons in the motion process of the traditional chaindrive. The impact of the polygon effect on the motion transmission was analyzed from thespeed and force, and the impact of several key parameters on the driving force was alsostudied, all those provided some basis for the smooth running of the chain drive.(2)The track of chain drive system was designed according to the limited spaceconditions. We developed a novel bi-driven chain drive system that has a U-shaped trackconstraints, and the new chain transmission significantly increases the efficiency in thevertical space compared with the traditional chain drive. The constrain expression of the chaindrive that between the vertical and horizontal direction and the radius of the tracks wassummarized. Each orbital radius of the entire chain drive system was optimized by thefunction of fmincon in MATLAB. Specific structural parameters of the entire chain drivesystem were identified. One of the optimal sizes of the structure was selected in accordancewith the requirements, which is used to derive fitting and curve load center track positions.(3) Part of the chain system was replaced by hinged four-bar mechanism, and the rodvelocity and acceleration were analyzed using the application of the analytical method.Meanwhile, the ADAMS software was applied to simulate. We finally obtained the motioncurves of each rod. Due to the unstable chain drive speed, we tried to counteract the speed ofuniform, counteract the speed of uniform, and got compensation trajectory on the speed. Theresults shows that it can not get effective compensation trajectory by applying two DOF fiveinstitutions simulation and equal arc method. It can get a more satisfactory compensationtrajectory at the transition arc using tracing point method.