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Gear Load

Input of gear load with one of following combination:

Power on pinion P1 kW and rotational frequency of pinion n1 Hz
Torque on pinion T1 Nm and rotational frequency of pinion n1 Hz
Torque on gear T2 Nm and rotational frequency of gear n2 Hz

Input with dialog:

Load Input Dialog

Materials for Gears

The application provides a dialog box for management of materials for gears. According the standard ISO 6336-5 the contact stress limit and bending stress limit are to determine in function of the tooth flank hardness using the equation of straight line σH,F = Ax + B where x stands for the hardness, A is the slope coefficient and B is the segment on y-axis. This three parameters are token from the standard. Input for a gear pair requires input of material separately for pinion and gear, the material quality grade and the hardness of tooth flank. With the equation of the straight line the contact stress limit value σHlim and the bending stress limit value σFlim are determined in function of the tooth flank hardness.

Gear Forces

Input of the coordinates of gear supports A and B and mesh point X. A cylindrical coordinate system is being used. The application calculates the gear forces as transverse tangential force Ft, transverse radial force Fr and the axial force Fa. The reaction forces in the supports are calculated.

Dynamic Model

The application provides for a powerfull modeller for the calculation of polar mass inertia moments for pinion and gear even in the dimensioning stage. The mass of a third gear such as an intermediate gear or as a gear rigidly connected to a pinion shaft can be taken into account. The polar mass inertia moments are reduced to a single mass per unit of facewidth acting along the contact line. The spring constant is determined with the single pair stiffness c' and the mean mesh stiffness per unit face width cγ as described in the standard ISO 6336-1. The application calculates the natural frequency of the mass-spring system and determines to which domain the speed of the gear pair wil belong. If the speed is in critical domain, the application will indicate which measures can be taken to remediate the problem.

Load Capacity according standard ISO 6336-2,3

The application determines the influence factors, the contact - and bending stresses, the permissible stresses for contact and root stress for the choosen gear materials. The safety factors for contact stress SH1,2 and tooth root bending stress SF1,2 are calculated and compared with the respectively imposed minimum values. The application warns with a messagebox if the imposed min safety factors are not satisfied. See for a part of the output window below:

Load Capacity Output Window

Output as text - or HTML file

The load capacity calculation report can be exported in a text (.txt) or HTML (.htm) file with a simple mouse click on a menu item. This files can be opened by a text editor, respectively with a browser.
Click here on Calculation Report Load Capacity to open a complete load capacity calculation report in a target blank page.

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Go to the next web page to read about the dimensioning problem and the verification calculation of a planetary gear train.