The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 11, 2023
Filed:
Nov. 11, 2021
Zf Friedrichshafen Ag, Friedrichshafen, DE;
Ulrich Kehr, Tettnang, DE;
ZF FRIEDRICHSHAFEN AG, Friedrichshafen, DE;
Abstract
An electric machine () includes a housing (), a stator () fixed within the housing (), a rotor () with a rotor shaft (), an air gap () formed between the rotor () and the stator (), and a cooling device () configured for liquid cooling of the electric machine (). The rotor shaft () defines an axial bore () in an axial direction, which extends at least partially into the rotor (). The rotor () defines a radially extending air duct (), which extends from an inner side () contacting the rotor shaft () to an outer side () facing the air gap (). The rotor shaft () defines a bore (), which is aligned with the air duct () such that air is flowable out of the rotor shaft () into the air gap ().