Patent · US Expired

Gear ring pump having a housing wall with a hollow cone recess

US6280167A · kind A · utility

5Cited by

2References

7Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Arnold Pahl · Markgröningen, DE
Rolf Hummel · Steinenbronn, DE
Gerd Baur · Märkisch Buchholz, DE

Key dates

Filing date	Aug 25, 2000
Grant date	Aug 28, 2001
Priority date	—
Expiry date	Aug 25, 2020

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF04C15/0042
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A gear pump has a gear wheel with teeth on an outer circumference and a second gear ring with teeth on the inside surface. The gear ring is guided in a circular-cylindrical recess of a housing and together with the gear wheel, each rotates about their own axis which are offset from one another. The gear pump is equipped with an intake opening and a crescent-shaped pressure opening in a first side wall of the housing that defines the recess. A countersunk feature is also provided, embodied as a hollow cone, in a second wall of the housing opposite the pressure opening. The hollow cone, which is in fluid communication with the pressure opening, promotes the buildup of a fluid film between the gear ring and the housing, which improves the wear resistance of the gear pump.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.