Fuel pump

US4938659A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Helmut Bassler · Waiblingen, DE
• Ulrich Kemmner · Sachsenheim, DE

Key dates

• Filing date: Jun 22, 1984
• Grant date: Jul 3, 1990
• Expiry date: Jun 22, 2004

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04D29/188
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a peripheral fuel-conveying pump, in which the rotatable impeller, provided with a plurality of vanes spaced from each other by grooves, is enclosed with the housing of the pump so that a fuel-feeding passage is formed between the inner wall of the housing and the periphery of the impeller. The dimensions of the fuel-feeding passage are defined by the first geometric characteristic R.sub.m which is a ratio between S and L, wherein S is the cross-sectional area of the space enclosed between the housing wall, defining the feeding passage, and the periphery of the impeller, and L is the length of the periphery of the portion of the impeller inserted into the fuel-feeding passage. R.sub.m must be in the range of 0.4-2 mm. The dimensions of the fuel-feeding passage are also limited by the second geometric characteristic R.sub.s =B/E and the third geometric characteristic RA=B/E, which must be in the range of 0.5-1.5, and wherein B is the width of the impeller in the axial direction, E is the height of each vane, A.sub.1 is the sum of the cross-sectional areas of the portions of space S positioned laterally of the impeller and A.sub.2 is the cross-sectional area of the remaining porti…