How to model Involute Gear in Solidworks?

Andreas Gkertsos

17 Feb, 2012 12:02 PM

these are the steps...

1. Step 1:

   First of all we need to add some equations... so Tools -> Equations ->
   

   

2. Step 2:

   We add the following equations... (module and No. of teeth is up to you)
   

   

3. Step 3:

   After we add all equations, we click ok and then we start a new sketch on front plane... We create a construction line vertical...(Random length)
   

   

4. Step 4:

   Then we create a horizontal construction line at the length of the D0.. and then we draw a circle.. We make the circle defined by linking the dimension with the equation..
   

   

5. Step 5:

   Next we create another construction line with an angle of a(degrees)...
   

   

6. Step 6:

   We create another one on the other side and make them co-linear. Then we draw another one from the cinter of the circle and make it perpendicular...
   

   

7. Step 7:

   We draw a circle from the center to that point. We then draw 5 construction lines from the center of the circle dividing the arc into 5 pieces...
   

   

8. Step 8:

   After, we divide the line above into 5 pieces with points...
   

   

9. Step 9:

   And we make the sections equal.. after that, we link the section dimensions, with the arc sections below...
   

   

10. Step 10:

    Next we draw construction lines, from every point of the arcs, and make them tangent to the circle... dimension them as in the picture...
    

    

11. Step 11:

    Same thing for the back side...
    

    

12. Step 12:

    spliting...
    

    

13. Step 13:

    tangent lines...
    

    

14. Step 14:

    next we create top circle of the gear... and link the dimension to the equation shown in the picture...
    

    

15. Step 15:

    same at here...
    

    

16. Step 16:

    select spline, and join the end points of the contsruction lines...
    

    

17. Step 17:

    Join the lower end of the spline with the center of the circle with a line..
    

    

18. Step 18:

    create a construction line in the point shown in the picture..
    

    

19. Step 19:

    mirror...
    

    

20. Step 20:

    convent entities for the 2 circles..
    

    

21. Step 21:

    trim...
    

    

22. Step 22:

    extrude the circle...
    

    

23. Step 23:

    then the tooth..
    

    

24. Step 24:

    add fillet linked with the following equation...
    

    

25. Step 25:

    Circular patern linked to Z
    

    

26. Step 26:

    And Voila.... a fully defined involute gear...