How to Generate Involute Gear in Pro E Software


This lesson covers the development of 'involute' gears. An involute gear is based on an involute curve, which is a mathematical shape. This article includes simple steps for generating involute curves then followed by simple extrude in Pro Engineering software. Involute curve is generated by simple equation.

This article deals with complete procedure to make involute profiled gear modeling in Pro-Engineer software. Follow the steps to get ahead.



STEP:1 Generating involute curve by an equation.

  • Pick File, New,then enter < involute_gear > for the name of the new part
  • Pick OK, in the ,New, dialog box
  • Pick Insert, Model Datum, Curve, From Equation, Done,
  • Select the default coordinate system, then pick Cartesian
  • In the Notepad window, enter the following equations:
    radius of the cylinder = 3.00
    angle = t * 90
    s = (3.14* radius of the cylinder * t ) / 2
    Xc = radius of the cylinder * cos(angle)
    Yc = radius of the cylinder * sin(angle)
    X = Xc + ( s * sin(angle))
    Y = Yc - ( s * cos(angle))
    Z = 0
  • Pick File, Save and File, Exit in Notepad
  • Pick OK in the dialog box
  • The result is shown here
  • This curve will be used to create an involute gear
  • Involute

    STEP:2 Create a Cylinder.

    Select the FRONT datum plane
  • Pick the Extrude icon
  • Press and hold the right mouse button and select Define Internal Sketch
  • Pick Flip in the Sketch dialog box
  • Pick Sketch in the Sketch dialog box
  • Sketch a circle centred on the references, with a diameter of 6.500, to represent the Outside diameter of the gear (see the figure on the previous page)
  • Pick the checkmark to complete the sketch
  • Enter < 1.750 > for the depth then pick the checkmark in the dashboard tool
  • Pick View, Orientation, Standard Orientation
  • The result is shown below, be sure the curve is in front of the cylinder as shown
  • Extrude

    STEP:3 Create three circles representing the major diameters.

  • Create a circular sketch on the FRONT datum plane with a diameter of 5.376 to represent the root diameter of the gear
  • Create a circular sketch on the FRONT datum plane with a diameter of 5.638 to represent the base diameter of the gear
  • Create a circular sketch on the FRONT datum plane with a diameter of 6.000 to represent the pitch diameter of the gear
  • The result is shown below
  • Pitch_Base_Root Diameter

    STEP:4 Create a datum point a datum curve.

    Set the selection filter to Datums, pick the involute curve and the 6.000 diametercircular sketch, then pick the Point icon and then pick OK to create a datum point.
  • Be sure the selection filter is set to Datums
  • Pick RIGHT, TOP, and FRONT then pick the Point icon then pick OK
  • Pick Insert, Model Datum, Curve, Done
  • Pick the two datum points then pick Done and OK
  • The result is shown below
  • Datum Point in Pro E

    STEP:5 Create a datum evaluate feature.

    Pick Insert, Model Datum, Evaluate
  • Enter < measure > for the name of the feature
  • Pick Create, then enter < angle > for the name of the measurement parameter
  • Pick Angle, then pick the TOP datum plane and the curve you just created through the points
  • Pick Done then read the message window and look at the model tree
  • Save the part

  • Pick the involute curve then pick Edit, Copy
  • Pick Edit, Paste Special
  • Add the checkmark next to Apply Move/Rotate transformations to copies in the dialog box then pick OK
  • Pick Rotate in the right mouse button popup menu
  • Pick the axis in the center of the cylinder then enter < -30 > for the rotation angle
  • Pick the checkmark in the dashboard tool
  • The result is shown

  • Double pick the copied involute curve
  • Double pick the 30 dimension
  • In the small text box, carefully enter: angle: FID_MEASURE + ( 7.5 / 2 )
  • Pick Yes to add the relation
  • Pick Edit, Regenerate
  • The result is shown
  • Rotate in Pro-E

    STEP:6 Mirror the copied involute curve.

    Pick the copied involute curve (the one created in task 7) then pick Edit, Mirror
  • Pick the TOP datum plane then pick the checkmark in the dashboard tool
  • The result is shown
  • Mirror in Pro-E

    STEP:7 Copy the curve again.

  • Pick the copied involute curve then pick Edit, Copy Pick Edit, Paste Special
  • Add the checkmark next to Apply Move/Rotate transformations to copies in the dialog box then pick OK
  • Pick Rotate in the right mouse button popup menu
  • Pick the axis in the center of the cylinder then enter < -15 > for the rotation angle
  • Pick the checkmark in the dashboard tool
  • The result is shown

  • STEP:8 Copy the curve again.

  • Pick the copied involute curve then pick Edit, Copy Pick Edit, Paste Special
  • Add the checkmark next to Apply Move/Rotate transformations to copies in the dialog box then pick OK
  • Pick Rotate in the right mouse button popup menu
  • Pick the axis in the center of the cylinder then enter < -15 > for the rotation angle
  • Pick the checkmark in the dashboard tool
  • Create an extruded (through all) cut using the edges of the curves as shown below Trim the sketch as shown below.
  • extruded cut

    STEP:9 Pattern the cut.

  • Set the selection filter to Features then pick the cut you just created
  • Pick Edit, Pattern, then set the type of pattern to Axis in the dashboard tool
  • Select the axis in the center of the cylinder
  • Enter < 24 > for the number of instances in the pattern
  • Pick the checkmark in the dashboard tool to complete the pattern




  • STEP:10 Finish the part.

  • Create a 0.020 round at the base of the gear tooth
  • Pattern the round
  • Create a coaxial hole with a diameter of 2.000
  • Use Layers to hide the datum curves and sketches
  • The completed part is shown below
  • Save the part and Close the window
  • spur gear


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    Comments

    Guest Author: Omar06 Feb 2013

    I am using Pro E Wildfire 5. I cannot find the evaluate feature, refer step five. Is there any other way around it?

    Guest Author: Mark H22 Oct 2013

    Regarding this example, where did you ever refer to Base Diameter circle that is required to create the involute curve? Why apply a rotation angle of -30 degrees when the resulting curve/geometry is never shown on your screen shots?

    MH



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