High thrust capacity shaft seal assembly for fuel pumps

Details High thrust capacity shaft seal assembly for fuel pumps High thrust capacity shaft seal assembly for fuel pumps

1984-09-12

1986-08-12

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

F16J 1534

Patent

active

046052356

ABSTRACT:
A shaft seal assembly (2) for a fuel pump includes a seal housing (4) attached to the fuel pump housing (6). A drive shaft (10) mounted for rotation in the fuel pump housing has a sealing face (14) which is engaged by a thrust face (42) of a thrust member (40) and by a seal face (18) of a carbon face seal (20). The thrust member and the carbon face seal are positioned with a steel carrier (26) mounted in the seal housing. A universal washer (32) is located between the carrier and the rear wall of the seal housing so that the carrier may undergo universal movement in response to movements of the thrust member. Misalignments between the axis of the shaft and the axis of the seal housing result in corresponding movements of the thrust member and the carrier which enable the axis of the face seal to remain aligned with the axis of the shaft. This arrangement permits the carbon face seal to be pressure balanced so that a relatively high fuel pressure surrounding the shaft will not produce unacceptable wear of the carbon face seal.

REFERENCES:
patent: 3552752 (1971-01-01), Lojkutz
patent: 3578344 (1971-05-01), Yost
patent: 3647227 (1972-03-01), Lojkutz et al.

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