Teilungsdurchmesser

Teilungsdurchmesser is a term used in German mechanical engineering to denote the diameter associated with dividing a circular feature into equal parts. The expression appears in contexts such as gear technology and in devices that divide circles (dividing heads, rotary tables). In practice, it points to a diameter that governs how a circle is partitioned, whether by gear teeth or by division marks.

In gear technology, the concept is closely related to the pitch circle diameter (Teilkreisdurchmesser). The pitch circle is the imaginary circle that passes through the tooth midpoints and defines the meshing geometry. Although Teilungsdurchmesser is sometimes used interchangeably with Teilkreisdurchmesser in informal texts, the precise term in standard gear terminology is Teilkreisdurchmesser. The pitch diameter D is typically calculated as D = m × z, where m is the module and z the number of teeth.

With dividing devices, the Teilungsdurchmesser refers to the diameter of the circle on which division marks are placed to generate evenly spaced features around a circumference, such as holes or teeth on a blank. The achievable division count depends on the device geometry, the spacing of the marks, and the relationship between circumference and division pitch. Practical use requires attention to the exact mounting geometry and the intended number of parts.

Because the term is not universally standardized, some sources prefer Teilkreisdurchmesser or Teilungsdurchmesser to avoid ambiguity. When precision is required, the exact definition should be stated in the context of the machine or gear under consideration.