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:
Oct. 13, 1998
Filed:
Nov. 22, 1995
Takeo Kushida, Saitama Prefecture, JP;
Fujio Aoki, Saitama Prefecture, JP;
Takayuki Ikeda, Saitama Prefecture, JP;
Koichiro Futamase, Saitama Prefecture, JP;
Tomoharu Sato, Saitama Prefecture, JP;
Hideya Kikuchi, Saitama Prefecture, JP;
Ken Sato, Saitama Prefecture, JP;
Nobuo Aoki, Saitama Prefecture, JP;
Katsuhiko Tsukazaki, Saitama Prefecture, JP;
Zexel Corporation, Tokyo, JP;
Abstract
A pump for low-viscosity fuel comprises a pump shaft 6 installed in a pump housing 2, 3, 4 and divided into a drive-side shaft 6A and a driven-side shaft 6B, a partition 12 provided between the drive-side shaft and the driven-side shaft of the pump shaft to prevent leakage of fuel from the housing, and a magnetic coupling 13 for transferring torque from the drive-side shaft to the driven-side shaft of the pump shaft through the partition, the magnetic coupling being disposed such that a first clearance C1, D1 between the magnetic coupling and the partition is larger than a second clearance C2, D2 between the magnetic coupling and the pump housing. When wobble occurs in the pump shaft owing to wear of the sliding contact portions thereof, the magnetic coupling makes contact with the pump housing before contacting the partition, thereby enabling the rotation of the pump shaft to be stopped before fuel leakage occurs.