Release Notes 2026

Maps for efficiency and more


The Maps feature introduces a flexible calculation approach that generates map-based results by varying input parameters such as torque and rotational speed, enabling clear visualization of system behavior across wide operating ranges. A typical application is efficiency analysis based on efficiency maps.
In general, this feature supports cross-over system wide calculations with constant or variable inputs as well as load spectrum generation through cross-over binning with limiting parameters. Graphical result visualization is available in 3D surface, 2D color or line representations.

REXS V1.7


This new feature allows the import of system models according to the REXS specification. The REXS specification, created by the FVA e.V. research association, is designed to be an industry wide standard for exchanging gear unit models between various software. Currently, versions up to REXS 1.7 are supported.

Short/long lead hobs


To optimize the root fillet geometry or extend the tool life, a short/long lead hob is often used in manufacturing. This hob has a different profile angle and a correspondingly modified normal module compared to the reference profile of the gear. It is now possible to define this hob type directly in the Reference profile tab. The adjusted root fillet geometry is taken into account in the geometry and strength calculations.

Strength of plastic gears according to GB/T 44846-2024


This newly implemtented load capacity calculation for plastic gears in accordance with GB/T 44846 enables the assessment of strength and durability by considering plastic-specific material behavior, operating conditions, and load influences. The calculation method supports a consistent, standards-based evaluation of plastic gear designs for performance validation and engineering optimization. It is available for both cylindrical and crossed helical gears and supports calculations using existing plastic materials from the KISSsoft material database.


Journal bearing characteristics

Hydrodynamic bearings are an essential machine element, especially for high-speed shafts. KISSsoft® calculates analytically the characteristics of hydrodynamic bearings, including their stiffness, damping, eccentricity ratio, and attitude angle at equilibrium. This calculation is available both in the standalone bearing module and is also integrated in the shaft module. This results in a more realistic static shaft calculation and also affects the dynamics of the shaft. The computation is based on the solution of the Reynolds equations, leading also to the 3D representation of the lubricant pressure inside the hydrodynamic bearing.