Designing Non-Circular Gears: Tips for Drawing Teeth Profiles

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SUMMARY

Designing non-circular gears, specifically elliptical gears, involves using an involute profile that changes around the gear. The gear must maintain an exact integer multiple of the tooth pitch along the circumference of the pitch ellipse to ensure smooth operation with a rack or another elliptical gear at a 90° phase. Drawing the tooth profile can be achieved through numerical methods or by utilizing the involute curve, although precise drawings are not necessary as tooth profiles are typically generated through cutting processes.

PREREQUISITES
  • Understanding of involute curves in gear design
  • Familiarity with elliptical gear mechanics
  • Knowledge of gear cutting processes
  • Basic skills in CAD software for gear design
NEXT STEPS
  • Research the mathematical principles behind involute curves in gear design
  • Explore software tools for simulating elliptical gear interactions
  • Learn about gear cutting techniques specific to non-circular gears
  • Investigate the design and application of trapezoidal racks in gear systems
USEFUL FOR

Mechanical engineers, gear designers, hobbyists interested in gear mechanics, and anyone involved in the design and manufacturing of non-circular gears.

ali durmaz
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Hi,
How can ı design a non circular gear?

How drawing teeth profiles?
 
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Welcome to PF.

The tooth profile on an elliptical gear changes around the gear. It is the same involute profile as used on a circular gear with the same radius of curvature at that point. An elliptical gear will then roll smoothly along a rack, or mesh with another elliptical gear at 90° phase. The important thing is to make sure that the circumference of the pitch ellipse will be an exact integer multiple of the tooth pitch.

You can draw the tooth profile using the involute curve, or you can roll the gear numerically along a trapezoidal rack.
Tooth profiles are usually generated by the cutting process. They do not have to be accurately drawn.

We need more specific information before answering further.
 
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