    1.1   Calculation Example: Splined Shaft for Lifting Gear
       1.1.1   Start the Calculation Module
       1.1.2   Input Values
       1.1.3   The Calculation
       1.1.4   Calculation Results
       1.1.5   Documentation: Calculation Report
       1.1.6   How to Save the Calculation

1.1 Calculation Example: Splined Shaft for Lifting Gear

We have prepared the following example to guide you through the calculation module. This calculation example is based on: G. Niemann, H. Winter, B.-R. Hoehn: Maschinenelemente Band I: Konstruktion von Verbindungen, Lagern, Wellen. Springer Verlag, 3rd Edition, 2001: p. 857 Example 4: Splined shaft for lifting gear.

1.1.1 Start the Calculation Module

Please login with your user name and your password. Select the module ‘Splined shaft’ through the tree structure of the project manager by double-clicking on the module or clicking on the button ‘New calculation’.

Figure 1.1:

Calculation module’

1.1.2 Input Values

A splined shaft connection with a splined shaft according to DIN ISO 14 is given. The safety against pressure is required. For our calculation example the following input values are given:

Diameter $d1$

= 32 mm

Diameter $d2$

= 38 mm

Number of keys

= 8

Key width

= 6

Supporting length $ltr$

= 40 mm

Manufacturing according to tolerance field

= H7/IT7

Application factor

= 1

Nominal operation torque $Tnenn$

= 2400 Nm

Maximum load peak torque $Tmax$

= 2400 Nm with number of load peaks $> 107$

No alternating torque

Outer diameter of hub $D2$

= 45 mm

Material shaft

= C45 hardened and tempered

Material hub

= C45 hardened and tempered

1.1.3 The Calculation

Profile Geometry Selection

In order to find the right profile, click the button ‘Selection’.

Figure 1.2:

‘Selection’ button

Select from the listbox ‘Standard geometry data’ the splined shaft profile according to DIN ISO 14 medium series.

Figure 1.3:

Profile geometry selection

You can narrow your search by entering certain parameters in order to find the right profile quicker. Just add the diameter $d 1$ , the number of keys as well the key width. Click on the button ‘Search’.

Figure 1.4:

Refine the profile geometry selection

After clicking the button ‘Search’, only one profile remains. Please select the profile and click the button ‘OK’.

Figure 1.5:

Selected profile

Enter ‘40 mm’ for the supporting length $l tr$ .

Figure 1.6:

Supporting length

Tolerance Field

Click the listbox in order to choose the tolerance field ‘H7/IT7’.

Figure 1.7:

Tolerance selection

The field ‘Profile’ displays the previously selected tolerance field.

Figure 1.8:

Tolerance field

Please add the application factor as well as the nominal operation factor $T nenn$ .

Figure 1.9:

Application factor and nominal operation torque

Load Peaks

Activate the load peaks und enter ‘2400’ for the maximum load peak torque $T max$ .

Figure 1.10:

Load peaks and load peak torque $Tmax$

Select the number of load peaks from the listbox.

Figure 1.11:

Number of load peaks

Kind of Load

There is no change in load direction, so enter the default setting ‘No alternating torque’ for the ‘kind of load’.

Figure 1.12:

Kind of load

Enter the value ‘45 mm’ for the outer diameter of the hub.

Figure 1.13:

Outer diameter of hub

Material of Shaft and Hub

Select the material ‘C45 hardened and tempered’ for the shaft.

Figure 1.14:

Material for the shaft

Note: In case you need further information on the material, click on the button ‘Material’.

Figure 1.15:

Material details

Select the hub material ‘C45 hardened and tempered’ from the listbox.

Figure 1.16:

Material for the hub

1.1.4 Calculation Results

All results (safeties at operation load and maximum load, the pressures for shaft and hub) will be calculated during every input and will be displayed in the result panel. A recalculation occurs after every data input. Any changes that are made to the user interface take effect immediately.

Figure 1.17:

Calculation results

For our calculation example the splined shaft is sufficiently dimensioned. In addition, the message window contains the hint that this shaft-hub-connection is suitable and can be used.

Figure 1.18:

Message window

1.1.5 Documentation: Calculation Report

After the completion of your calculation, you can create a calculation report. Click on the ‘Report’ button. You can navigate through the report via the table of contents that provides links to the input values, results and figures. This calculation report contains all input data, the calculation method as well as all detailed results. The report is available in HTML and PDF format. The calculation report saved in HTML format, can be opened in a web browser or in Word for Windows.

You may also print or save the calculation report:

To save the report in the HTML format, please select ‘File’ $→$ ‘Save as’ from your browser menu bar. Select the file type ‘Webpage complete’, then just click on the button ‘Save’.
If you click on the symbol ‘Print’, then you can print the report very easily.
When you click on the symbol ‘PDF’, then the report appears in the PDF format. If you right-click on the PDF symbol, you should see the ‘Save Target As’ option. Click on that option and you will see the dialog box for saving the report.

Figure 1.19:

Calculation report

1.1.6 How to Save the Calculation

When the calculation is finished, you can save it to your computer or to the eAssistant server. Click on the button ‘Save’.

Figure 1.20:

‘Save’ button

Before you can save the calculation to your computer, you need to activate the checkbox ‘Enable save data local’ in the project manager and the option ‘Local’ in the calculation module. A standard Windows dialog for saving files will appear. Now you will be able to save the calculation to your computer.

Figure 1.21:

Windows dialog for saving the file

In case you do not activate the option in order to save your files locally, then a new window is opened and you can save the calculation to the eAssistant server. Please enter a name into the input field ‘Filename’ and click on the button ‘Save’. Then click on the button ‘Refresh’ in the project manager. Your saved calculation file is displayed in the window ‘Files’.

Figure 1.22:

Save the calculation

Our manual is improved continually. Of course we are always interested in your opinion, so we would like to know what you think. We appreciate your feedback and we are looking for ideas, suggestions or criticism. If you have anything to say or if you have any questions, please let us know via phone +49 (0) 531 129 399-0 or email eAssistant@gwj.de.

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