Internal Geneva Mechanism
AIM:
To simulate the internal geneva mechanism for the given condition and plot the graph for
- Contact force (between driving and the driven wheel) as a function of time.
- Angular Displacement of the driven wheel.
for respective condition.
INTRODUCTION:
The Geneva drive is a gear mechanism that translates a continuous rotation movement into intermittent rotary motion.
The rotating drive wheel is usually equipped with a pin that reaches into a slot located in the other wheel (driven wheel) that advances it by one step at a time. The main wheel also has an elevated circular blocking disc that "locks" the rotating driven wheel in position between steps.
An internal Geneva drive is a variant on the design. The axis of the drive wheel of the internal drive can have a bearing only on one side. The angle by which the drive wheel has to rotate to effect one step rotation of the driven wheel is always smaller than 180° in an external Geneva drive and always greater than 180° in an internal one, where the switch time is therefore greater than the time the driven wheel stands still.
Modeling and Assembly:
The modeling of both the wheels as well as tshe assembly is being carried using SolidWorks.
My Modelling
Geneva driven wheel
Geneva Driving wheel
Mates used for assenmbly
Youtube Video link:
Results:
Angular Displacement of Driven hook
Angular Velocity of driven wheel at 60 fps
Contact force between Driven wheel and driving wheel
RESULT:
From the above simulation we study and analysis the motion of the internal geneva wheel and graph are plotted from different condition . we can also note that reaction force increases at time of contact of shaft and slot and thus decreases gradually and displacement takes place faster with increase in speed . The precises contact can be used for approximate results . This mechanism has a wider range of application as stated above