Sets parameters for calculation of a press fit.
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Access: |
Ribbon:
Design tab
Power Transmission panel
Press Fit Calculator
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Required Load
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Enter values for required transferred loading. |
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Required Torque |
Performs a calculation according to required torque. |
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Required Force |
Performs a calculation according to required force. |
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Torque |
Maximum torque required to transfer between shaft and hub. |
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Force |
Axial force required to transfer between shaft and hub. |
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Safety Factor |
Enter the value of safety factor. This value is multiplied with force or torque and in fact describes size of over design. Use higher number than 1.0 specially if non-static load is applied. |
Dimensions
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Enter dimensions for press fit. If you enter values that do not correspond with other dimensions, the values are displayed in red. |
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Outer Diameter |
Enter outer diameter of the hub. |
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Shaft Diameter |
External shaft diameter in place of contact. |
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Inner Diameter |
Internal shaft diameter of hollow shaft. If solid shaft is considered use 0.0. |
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Connection Length |
Enter length of pressure connection. |
Limits and Fits
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This part of the panel is used to find standard fit for shaft and hub. |
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Fit Symbol |
Standard hub and shaft fit that is calculated based on ISO or ANSI standard. |
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Change... |
Opens the Limits and Fits Mechanical Calculator - Interference Fit dialog box. You can adjust the maximum and minimum interference. Click OK to return to the Calculation tab. |
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Fundamental Deviations |
If the corresponding standard fit for the calculated maximum possible and minimum possible interference cannot be found, the limit deviations are calculated and numerically expressed. In the tolerance field, you can adapt the limit deviations. You cannot exceed maximum possible or minimum possible interference. If so, the calculated interferences are shown in red and display an error message. To adapt limit deviations, clear the check box for the Specify manually option in the Fundamental Deviations box. Note: : When you click Calculate, Design Accelerator presents a new solution or calculates new limit deviations. Your changes are not saved. When you edit the fields, partial results are calculated. It is not necessary to start the calculation again.
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Advanced
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Assembly Clearance |
Assembly clearance is an important dimension for the shaft cooling temperature calculation and hub warming. You can specify the dimension only when the Assembly Clearance check box is selected. |
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Surface Smoothness |
Surface quality affects the size of the trueing at contact surfaces and the size of efficient interference. Trueing is not applied to perfectly smooth surfaces. For smooth surfaces, the efficient interference equals the minimum interference and the maximum loading capacity. The Surface Smoothness fields for editing surface quality are only available when you select the Surface Smoothness check box. If you clear the check box, you can specify the value of trueing. The surface quality value is not used in the calculation. |
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Clamping Factor |
The calculation contains a table of minimum values for the steel parts clamping coefficient. Click the arrow on the Clamping Factor box to open the Clamping Factor table. |
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Clamping Factor (pressing) |
Applies this factor for connections manufactured (connected) in the cold state. Pressing force affects the assembly shaft and hub. |
Hub Material
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Opens the Material Database where you select a material. Edit the properties of the material, if needed. |
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Material can be selected form predefined values. All properties that are used in calculation are displayed and can be modified if "user" material is selected. |
Shaft Material
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Opens the Material Database where you select a material. Edit the properties of the material, if needed. |
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Material can be selected form predefined values. All properties that are used in calculation are displayed and can be modified if "user" material is selected. |
Temperature
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Limitation of Hub Warming Up |
Sets limitations for hub warming up. |
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Limitation of Shaft Cooling |
Sets limitations for shaft cooling. |
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Hub Warming Up |
Specifies the minimum warming up temperature for the hub if the connection is assembled in the hot state. |
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Base Temperature |
Specifies the base temperature of the surroundings environment. |
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Shaft Cooling |
Specifies the minimum cooling temperature of the shaft if the connection is assembled in the hot state. |
Results
Displays the results of strength proportion calculation. Also, the hub warming temperature is shown, which can be reduced by using shaft cooling.
Summary of Messages
Displays the reports about calculations. To open the Summary of Messages area at the bottom of the tab, double-click the double line at the bottom of tabs or click the chevron.