Internal Geneva Mechanism

Objectuve:-

• to design the driver and driven wheel of internal geneva mechanism using solidworks 3d part design.
• to study the motion analysis after constraining the wheels properly and providing the torque to the driving wheel.
• to conclude results after ploting graphs.

Introduction:-

• intrenal geneva mechanism consists of two wheels

1. driving wheel
2. driven wheel

• when the driving wheel is provided power it rotates
• it rotates as so when the driving completes 360 degree
• then it rotates the driven wheel for once

Theory:-

• in geneva mechanism the continous rotatory motion is converted into intermittent rotatory motion.
• as we provide power to the driving wheel ,then through the pin ctreated on driving wheel which goes into the slot created in the driven wheel the power is transmited to the driven wheel.
• there are 3 types of geneva mechanism

1. external geneva mechanism
2. internal geneva mechanism
3. spherical geneva mechanism

• in internal geneva mechanism there are 4 slots created in the driven wheel,so that the pin created on driving wheel gets locked in these and then it causes the motion.
• material selected for both of the wheels is dry steel.

Model when assembled(using solidworks):-

Results:-

• For 10 rpm:-

1. Contact force (between driving and the driven wheel) as a function of time without precision:-

b. Contact force (between driving and the driven wheel) as a function of time with precision 60:-

c. Angular displacement of the driven wheel without precise contact:-

d. Angular displacement of driven wheel with precise contact 60:-

For 20 rpm:-

1. Contact force (between driving and the driven wheel) as a function of time with precision 120:-
2. 

b. Angular displacement with precise contact 120:-

• Conclusions:-

1. we can see in the force time graph the motion occurs after a defined interval of time which shows that the contact between driven and driving wheel takes place after a specific time period.
2. precise contact gives more precise results.
3. through this graph we can conclude the geneva mechanism is kind of a periodic motion.