Kinematics characteristics of the internal and external Geneva mechanism under the effect of multi design parameters

الملخص EN

In this paper, the effect of some design parameters on the kinematic characteristics (displacement, velocity, and acceleration) of the external and internal Geneva Mechanism (GM) has been considered analytically using MATLAB and numerically using Solid Works program.

The parameters, such as the change of: the drive pin diameter or the width of slot or the total tolerance, the direction of motion of the pin when it enters or leaves the slot; tangent, above and below to the centerline of the slot, and the number of slots (inside or outside diameter) of the wheel, were taken into account.

To compare the results, three, six, and nine slotted external and internal Geneva wheels (GWs) were used for the same crank length and constant driving angular speed.

In order to remove the unwanted non-zero initial and final accelerations or jerks, two crankrocker linkages, the first combining with external six-slot GW and the second combining with internal three-slot GW, were suggested and simulated using SolidWorks program.

From that, the angular acceleration of the slotted wheel at the specified (initial and final) positions has been eliminated to zero or reduced to small value.

Also, the maximum angular velocity and acceleration of the wheel joining the first linkage has been reduced to about 39.4% and 63.3%, respectively, while in the case of the wheel joining the second linkage, the maximum angular velocity and acceleration has been increased to about 279.4% and 27.4%, respectively