Challenge

Internal Geneva Mechanism by solidworks motion analysis

GENEVA MECHANISM USING SOLIDWORKS 2019

AIM:

Our aim is to create the models and assemblies of an internal Geneva mechanism and create a motion analysis to determine its contact forces.

OBJECTIVE:

GENEVA MECHANISM:

The Geneva drive or Maltese cross is a gear mechanism that translates a continuous rotation movement into intermittent rotary motion.

WORKING:

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 drive wheel also has an elevated circular blocking disc that "locks" the rotating driven wheel in position between steps.

EXTERNAL TYPE:

INTERNAL TYPE:

SPHERICAL TYPE:

A TOUCH OF HISTORY:

The name was originated, as these mechanisms were used in watch making purposes in Geneva. (The classical origin of watches).
These mechanisms were capsuled in oil for efficiency and reduce wear.
The no of slots can be increased to get reduced angular displacement.

APPLICATIONS:

Used in watches.
Used in Cameras and projectors in earlier time to change each frame at a required fps. This is the reason for the potholes in the film strip.
Used in CNC machines for turret applications.

CALCULATION AND FORMULA:

MODEL IMAGES WITH ASSEMBLY:

PRECISE CONTACT:

NO PRECISE CONTACT:

60FPS @10RPM:

120FPS @ 20RPM:

CONATCT FORCE AND ANG. DISPLACEMENT @10RPM:

CONATCT FORCE AND ANG DISPLACEMENT @20RPM:

Ship work like this
in your own course.