Coolant pump with application-optimised design

US11125244B2 · kind B2 · utility

Assignee

• NIDEC GPM GMBH · DE

Inventors

• Franz Pawellek · Herbstein, DE
• Conrad Nickel · Troistedt, DE
• Jens Hoffmann · Darmstadt, DE
• Robin Büsch · Hildburghausen, DE
• Paul Ludwig · Erfurt, DE
• Jakob Schnitzer · Hildburghausen, DE
• Silvio Werner · Rödental, DE

Key dates

• Filing date: Jul 10, 2018
• Grant date: Sep 21, 2021
• Expiry date: Aug 30, 2038

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01P2005/125
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An electric coolant pump is used as an auxiliary water pump in a vehicle. The pump includes radial mounting of the shaft (4) is provided by means of a coolant-lubricated radial sliding bearing (41) arranged between the pump impeller (2) and the rotor (32). A dry-running electric motor (3) with a radially inner stator (31) and a radially outer rotor (32) is accommodated in a motor chamber (13) separated from the pump chamber (10). A shaft seal (5) is between the radial sliding bearing (41) and the motor chamber (13). The rotor (32) is bell-shaped with an inner surface facing the shaft seal (5) and being fixed to the shaft seal (5) to axially overlap with the shaft (4). The motor chamber (13) has an opening to the atmosphere, which is closed by a liquid-tight pressure equalization membrane (6) that is permeable to vapor.