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. 03, 1990
Filed:
Jun. 22, 1984
Helmut Bassler, Waiblingen, DE;
Ulrich Kemmner, Stuttgart, DE;
Robert Bosch GmbH, Stuttgart, DE;
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 portion of space S.