31.1.5. QFB Gear

A QFB(Quasi-Flexible Body) gear is composed of a main body and each tooth body. Each tooth body is connected to the main body by a Spherical joint and Bushing force
Gear geometries are created from the parameters of ISO standards. The tooth profile is represented by multiple arcs. The sprocket 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 31.26 QFB Gear Group gear geometry(Left) Construction(Right)

31.1.5.1. Properties

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Figure 31.27 QFB Gear property page [Geometry Data page]

The QFB Gear property page is shown in Figure 31.27. 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.

  • 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.

  • Hob Rack Radius Coef.: Enters the coefficient to define the hob rack radius. The default value is 0.38 (ISO 53, JIS Standard) and this should be equal or larger than 0. For more information, click here.

    Note

    In order to apply these values, The number of Under-Cut Arc should be defined in Tooth Profile page. For more information, click here.

  • 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.

  • Group Gear Color: Defines the gear color.

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

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    Figure 31.28 Gear Information dialog box

  • Bushing Force Property: Defines the characteristic for Bushing Force. Refer to Bushing Force supported as a Force entity.

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    Figure 31.29 Bushing 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 31.30 Gear Tooth Profile Editor dialog box

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

  • Each Rendering: The selected mode can be displayed in Each Render mode.