Pumps – Motor driven – Electric or magnetic motor
Patent
1995-11-22
1998-10-13
Thorpe, Timothy
Pumps
Motor driven
Electric or magnetic motor
417373, F04B 1700
Patent
active
058203583
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.
REFERENCES:
patent: 4722661 (1988-02-01), Mizuno
patent: 5066200 (1991-11-01), Ooka
patent: 5127796 (1992-07-01), Nakao et al.
patent: 5165868 (1992-11-01), Gergets et al.
patent: 5464333 (1995-11-01), Okada et al.
patent: 5630708 (1997-05-01), Kushida et al.
Aoki Fujio
Aoki Nobuo
Futamase Koichiro
Ikeda Takayuki
Kikuchi Hideya
Thorpe Timothy
Tyler Cheryl J.
Zexel Corporation
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