TASK DEFINITION: In this task, you are to Translate German text to English
PROBLEM: Das Kernteil (17) ist drehschlüssig mit einer Abtriebswelle (25) verbunden.

SOLUTION: The core component (17) is fitted to rotate with an output shaft (25).

PROBLEM: bis (d.).

SOLUTION: through (d.).

PROBLEM: Formel 2

SOLUTION:
Formula 2