Slide ring seal with circumferentially variably-beveled counter-surface on a shrink fitted slide ring thereof
AssigneeSafematic Oy
InventorAntti-Jussi Heilala
Life of this patent
Estimating the term…
Abstract
A slide ring seal for sealing a machine part which is rotatable with respect to a wall. The seal comprises seating rings provided with slide rings, the seating rings being so arranged with respect to each other that the sealing slide faces of the slide rings are pressed against each other and rotate with respect to each other. Each slide ring is fastened to its seating ring by means of a shrink fit in such a way that the slide ring is exposed to a radially-acting press force. In order to provide the slide face with a wave shape in the peripheral direction, an axial counter-surface of the seating ring, which in the shrink fit makes contact with an axial peripheral surface of the slide ring, is an axially discontinuous surface.
Claims5
A slide ring seal for sealing between a wall part and a shaft part which is rotatable with respect to the wall part, about a longitudinal axis of the shaft part,
- said slide ring seal comprising:
- a first assembly comprising:
- a first seating ring adapted to be mounted on one of said parts, said first seating ring having means providing a circumferentially-extending first recess;
- a first slide ring received in said first recess and secured to said first seating ring, said first slide ring having an axially-presented first slide ring counter-surface which is exposed from said first seating ring;
- and
- a second assembly comprising:
- a second seating ring adapted to be mounted on the other of said parts, said second seating ring having means providing a second recess;
- a second slide ring received in said second recess and secured to said second seating ring, said second slide ring having an axially-presented second slide ring counter-surface which is exposed from said second seating ring;
- said means providing said second recess including an axially-facing inner end wall surface perimetrically-bounded by an axially-extending flange means having an axial length and a radial thickness, a radially inner counter-surface and a free end;
- wave-forming means for forming a wave-like pattern on said counter surface of said second slide ring, said wave-forming means defining a plurality of angularly-spaced notches in said radially inner counter-surface extending from said free end at least part way through said axial length and radial thickness of said axially-extending flange means, said notches thereby dividing said radially inner counter-surface into a plurality of angularly-spaced radially inner counter-surface portions;
- said second seating ring having said radially inner counter-surface portions disposed in interference-fit engagement with a radially outwardly-facing outer circumferential surface of said second slide ring for securing said second slide ring to said second seating ring;
- said first slide ring counter-surface is coaxially disposed in surface-to-surface sliding engagement with said second slide ring counter-surface, whereby said second slide ring, including said second slide ring counter-surface, in use, is locally worn to a greater degree where surrounded by said radially inner counter-surface portions than where surrounded by said notches so as to become waveform in a circumferential direction of said second slide ring counter-surface with sites of greater wear being located angularly intermediate each respective pair of said notches closest to each other.
Dependencies are inferred from the claim text.