Abstract
In a paper previously published by the authors, kinematic analysis of a jack mechanism driven by a motor tetrad was done. For the actual design of the mechanism, the forces and moments acting on the kinematic elements that are part of it must be determined. Also, the driving force in the hydraulic cylinder must be determined, so that the mechanism works in good conditions, for a certain technological task imposed by the design theme. The present paper makes the kinetostatic analysis of the mechanism studied, from the kinematic point of view. Therefore, the reactions in the kinematic couplings of the mechanism, as well as the driving force of the hydraulic cylinder, are determined. In order to determine the reactions of the kinematic couplings, as well as the driving force of the hydraulic cylinder, the masses of the elements, the moments of mechanical inertia, as well as the load force acting on the jack were considered. The results of the calculations were graphically represented, in reaction patterns. In order to verify the correctness of the calculations, the balance force (the hydraulic cylinder motor force) was determined by both the kinetic and the virtual power method, and the results are the same.
Highlights
This mechanism was patented by William P Brown and developed year by year for improving its performances [1]
The program contains the kinematic analysis of the mechanism, as this is necessary for the kinetostatic analysis
It is mentioned that the kinetostatic analysis is made in the opposite direction of the kinematic analysis, namely starting with the last structural group kinematically analysed, dyad RRR(8,9) and ending with the motor tetrad RRR-Ta-RRR(1,2,3,4,5)
Summary
This mechanism was patented by William P Brown and developed year by year for improving its performances [1]. There are many researches on this mechanism. Patil[1] and S.D. Kachave studied, using Pro-E software, the construction of this mechanism intended to reduce weight of scissor jack and, at the same time, maintaining its strength and service life. The study was made using 3D modelling [2]. This mechanism is used in the construction of the high scissor lift platform and some research were done using 3D Pro/E software [3]. Other researches about this mechanism were done by researchers from different countries, each of them trying to improve it. Other researches about this mechanism were done by researchers from different countries, each of them trying to improve it. [4-11]
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