Patent ID: 8128096

Claim:
A mechanical seal assembly comprising: a pair of co-operating seal rings ( 2 , 5 ), one of which is held rotationally fixed and the other of which is provided to rotate together with a rotating component, wherein one of the seal rings is axially movable and biased by a spring ( 13 ) against the other seal ring, a retainer housing ( 1 ) at which the rotating seal ring ( 2 ) is retained near an axial end thereof, the retainer housing having an inner surface and an outer surface, a mounting member ( 12 ) configured to be mounted rotationally fixed at a rotating member, and a rotary force transmission device ( 10 ) for transmitting a rotary force between the mounting member ( 12 ) and the retainer housing ( 1 ), wherein the rotary force transmission device ( 10 ) comprises a transmitting ring ( 15 ) retained in press-fit within a recess ( 9 ) in the inner surface of the retainer housing ( 1 ) near the other axial end thereof, the transmitting ring ( 15 ) including at least one engagement member ( 20 , 20 ′) protruding axially from an inner end face ( 18 ) of the transmitting ring ( 15 ), and radially inward beyond an inner circumferential face of the transmitting ring, the at least one engagement member ( 20 , 20 ′) engaging in an aligned recess ( 22 ) in the mounting member ( 12 ).