KISSsoft Tutorial-Analyzing the Geometry of Worm Gears that have a Globoid Worm Gear

 

1 Task

1.1 Task

To calculate a worm gear with center distance 100 mm. The worm has 2 teeth, and the worm

gear has 41 teeth. The axial/transverse module is 4. The pressure angle at the normal section

is 20°. The worm's toothing length is 60 mm. You should select a sensible tooth width for the worm gear. The axis tolerance is js7. The worm's tooth thickness deviation in the normal section is between 0 and -0.04 mm. The tooth thickness deviation for the worm gear is between -0.128 and -0.168. The external diameter of the worm is 44 -0.01 mm. The root diameter is 26.4 -0.110 mm. The effective tip clearance is to be 0.8 mm. The root radius factor is 0.2. The inside radius diameter is 134.4 mm. The tolerance for the external diameter of the worm gear is between 0 and -0.01, for the active root diameter it is between - 0.360 and -0.473. The worm is to be manufactured with accuracy grade 6 as specified in DIN 3974. The worm gear is to be manufactured with quality 7. The lead direction is to the right. The worms flank form is ZI.

1.2 Starting the drive element of a worm gear with a globoid worm wheel.

Once you have installed and activated KISSsoft either as a test or licensed version, follow these steps to call the KISSsoft system. Usually you start the program by clicking "Start?Program Files?KISSsoft 03-2011?KISSsoft".This opens the following KISSsoft user interface:

Figure 1.1 Starting KISSsoft, initial window

In the Modules tree window, click the "Modules" tab to call the "Worms with enveloping worm

wheel" calculation:

Figure 1.2 Calling the worm gear calculation.

1.3 Inputting data in the main screen

After you call the analysis for a worm gear with a globoid gear, this input screen appears. In the

"Strength" group, now select " Only geometry calculation" as the calculation method.

Figure 1.3 Input screen for worms

Input values for the axial/transverse module, number of teeth, quality and worm face width in the "Basic data" tab. You must also input the axis distance (1). The subsequent interim value

is calculated because only the lead angle needs to be calculated. To do this, click the "Convert

button" (2) and then click "Calculate" (3) to determine the lead angle. Finally, click Accept (4) to transfer this data to the main screen (see Figure 1.4).

Figure 1.4 Interim state with the Sizing lead angle input screen

Click the "Details" button to call the "Define details of geometry" sub-screen and then select the appropriate flank form ZI. You must also input the inside diameter of the worm gear as 134.4 mm.

Figure 1.5 Interim status with "Define details of geometry" input screen

1.4 Special features of worm gear teeth flank surfaces

The flank surfaces of a worm gear are defined in a different way from those in cylindrical gears.

Figure 1.6 Calling the information graphic to describe wheel rim width b2R and wheel width b2H en

Then click the "Sizing button" to calculate the gear width .

Figure 1.7 Calculated wheel rim width b2R

1.5 Input data for the gear pair

In the "Reference profile" tab, select "Own Input" as the predefined tool profile. Then click the relevant "Convert button" to calculate the addendum and dedendum coefficients for the worm. Then click Accept to transfer the dedendum and addendum coefficient values to the

main screen.

Figure 1.8 Calculating the worm root or tip diameter

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