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:
Mar. 28, 1989
Filed:
Nov. 26, 1984
Herbert N Underwood, Chicago, IL (US);
Borg Warner Corporation, Chicago, IL (US);
Abstract
An offset three-gear, two-system pump includes first, second, and third overlapping chambers. First inlet and low-pressure outlet ports communicate with the first and second chambers, and second inlet and high-pressure pressure outlet ports communicate with the first and third chambers. The first chamber has a short wall portion extending from the low-pressure outlet port to the second inlet port, and a long wall portion extending from the high-pressure outlet port to the first inlet port. First, second, and third gears are respectively rotatable in the chambers. The first and second gears form a low-pressure gear set, and the first and third gears form a high-pressure gear set. A small number of first gear teeth are cooperable with the short wall portion and a large number of first gear teeth are cooperable with the long wall portion to effect sealing against leakage from the pressure ports to the inlet ports.