31.1.8. Helical-Internal Gear

Helical-Internal Gear is a cylindrical shaped gear, but with the teeth inside the circular ring. It can mesh with a helical gear.
A helical-internal gear is composed of a single body. Gear geometries are created from the parameters of ISO standards. The tooth profile is represented by multiple arcs. The gear tooth geometry data is:

  • Created from a predefined data file.

  • Edited from a predefined data file.

  • Exported from a predefined data file.

  • Imported from a predefined data file.

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Figure 31.43 Helical-Internal Gear assembled with a helical gear

31.1.8.1. Properties

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Figure 31.44 Helical Internal Gear property page [Geometry Data page]

The Helical Internal Gear property page is shown in Figure 31.44. The parameters are explained below. In order to understand the geometry, refer to Geometric Entities.

  • Module: Enters the module of the gear.

  • Pressure Angle: Enters the pressure angle of the gear.

  • Helix Angle: Enters the helix angle of the gear.

  • Number of Teeth: Enters the number of teeth. The maximum number of teeth of gear is 400.

  • Gear Width: Enters the width of the gear.

  • Parameter Type: two methods are supported to define the Addendum and Dedendum.

    • Factor: Defines the addendum and dedendum as factors. For more information, click here.

      • Addendum Factor: Enters the factor to define the addendum.

      • Dedendum Factor: Enters the factor to define the dedendum.

    • Addendum Radius & Whole Depth: Defines the addendum and dedendum as addendum radius and whole depth. For more information, click here.

      • Addendum Radius: Enters the addendum radius for the gear.

      • Whole Depth: Enters the whole depth as summation for the addendum and dedendum.

  • Addendum Modification Coef.: Enters the coefficient to define the addendum.

  • Delta Tooth Thickness: Enters the delta value to define the tooth thickness. For more information, click here.

  • Information: Shows the calculated values for Pitch Radius, Tip Radius, Base Radius, Root Radius, and Circular Tooth Thickness.

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    Figure 31.45 Gear Information dialog box

  • Draw: All data must be defined with respect to the tooth marker. You can move points graphically by using the mouse directly.

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    Figure 31.46 Gear Tooth Profile Editor dialog box

  • Generate optimal arc segment: In order to apply the modification of tooth, this button should be clicked.