دراسة وتطوير ناقل الحركة المتغير بلا حدود يعتمد على مبدأ الكامة

Rp-Study and Development of Cam Based Infinitely Variable Transmission.pdf

Infinitely variable transmission (IVT) is the system that transmits rotational motion between two rotating elements with the ability to produce continuous (stepless) transmission ratios, including zero value. In this thesis, a cam based (IVT) system is studied, geometrically designed and assembled, where this IVT is recently developed. The system consists of two identical units; each unit contains cam, cam-follower, slotted link, follower grooved wheel, grooved wheel and ratchet. A theoretical kinematic analysis of the system is presented. In addition, a simulation model using Solidworks software is constructed to simulate the system in practice.
The cam profile selection and design is the main task in the designing process in this work. A uniform velocity and fifth-degree polynomial profiles were selected for the outward and return stroke, respectively.
The dynamic theoretical analysis in conjunction with the simulation model are applied to the whole system and for each part individually. A comparison is made between both types of analysis for each element in the system. The importance of having the simulation model is to ensure that the theoretical analysis is correct. On the other hand, the importance of the theoretical analysis is to achieve a conceptual appreciation of the dynamics of the system.
The analysis and results were carried out under two conditions; fixed transmission ratio and variable transmission ratio. For the first condition, typical values of the vertical distance Yi are considered (45,55 & 65) mm. There was a high agreement between the results obtained from both theoretical study and simulation. For the Second condition, a variable Yi was taken during the operation, and excellent agreements between results were achieved with a small amount of error of about 2%.
In addition to the kinematics study, which applied using both analyses, a force analysis is achieved for the system using the simulation approach. This is important to determine the contact forces.