Internal Geneva Mechanism

Objectve:

1)Create 3D models for driver and driven wheels of Geneva Mechanism.

2)Creating Assembly of Geneva Mechanism.

3)Simulation of geneva mechanism at 10rpm and 20 rpm

4)Plot a graph of Contact force (between driving and the driven wheel) as a function of time.

5)Plot a graph of angular Displacement of the driven wheel.

Theory 

The Geneva drive or Maltese cross 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.

Applications of the Geneva drive include the pen change mechanism in plotters, automated sampling devices, banknote counting machines, and many forms of indexable equipment used in manufacturing (such as the tool changers in CNC machines; the turrets of turret lathes, screw machines, and turret drills; some kinds of indexing heads and rotary tables; and so on). The Iron Ring Clock uses a Geneva mechanism to provide intermittent motion to one of its rings.

Cad Modeling and assembly

A cad model of internal geneva mechansim is created consisting of driven and driver wheel. The following components are assembled using assembly mates.Then Motion analysis is caried out at 10 rpm and 20 rpm.

Figure 1 Sketch of Internal Geneva Mechanism

Results and Dicussion 

Figure 2 Contact Force without precision 

Figure 3 Contact Force with precision 

Figure 4 Angular velocity of driver wheel

 

20 Rpm 

Figure 5 Contact Force without precision 

Figure 6 Contact Force without precision 

Figure 7 Angular velocity of driver wheel

Animation 

Conclusion

1)From figure 2,3,5,6 it is clear that average contact force increases with increase in rpm.

2)Precise contact gives analytically correct results by using the equations that represent the solid bodies. 

3) Velocity of driven increases and then decreases and then stops and this pattern repeats.

4)From Figure 7 it is evident that first angular acceleration takes place then angular retardation of driven wheel.

5) From angular velocity digram and animation, a jerk at contact comes on driven wheel

6) Maximum angular velocity of driven wheel is less than that of driver wheel due to large diameter of driven wheel.

 

References

1) http://help.solidworks.com/2017/english/solidworks/motionstudies/hidd_motion_study_properties.htm

 


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