Method of retaining a dynamic seal in a bore that has a draft
The invention provides a seal assembly for a shaft. The seal assembly includes a seal member operable to encircle a rotatable shaft. The seal member includes an outwardly facing annular sealing surface. The seal assembly also includes a carrier having an aperture sealingly receiving the annular sealing surface. The aperture extends along an axis between a first edge to a second edge. The aperture includes a first surface portion having a first surface finish and a second surface portion having a second surface finish rougher than the first surface finish. The second surface finish cooperates with the annular sealing surface to limit movement of the seal member along the axis.
1 . A seal assembly for a shaft comprising:
a seal member operable to encircle a rotatable shaft and having a PTFE member with an annular sealing surface,
a steel ring fixedly engaged with said PTFE member;
an elastomeric collar fixedly engaged with said steel ring, wherein said PTFE member is at least partially disposed between said steel ring and said elastomeric collar; and
a carrier having an aperture sealingly receiving said annular sealing surface and extending along an axis between a first edge to a second edge, wherein said aperture includes a first surface portion having a first surface finish and a second surface portion having a second surface finish rougher than said first surface finish to limit movement of said seal member along said axis.
2 . The seal assembly of claim 1 wherein said rougher second surface portion is spaced from said first edge.
3 . The seal assembly of claim 2 wherein said rougher second surface portion extends along said axis from said second edge.
4 . The seal assembly of claim 3 wherein said first surface portion is substantially smooth.
5 . The seal assembly of claim 3 wherein said first surface portion and said second surface portion are continuous.
6 . The seal assembly of claim 3 wherein said first surface portion and said second surface portion extend directly to one another from said first edge and second edge, respectively.
7 . (canceled)
8 . The seal assembly of claim 1 wherein a dynamic seal is defined between said elastomeric collar and said PTFE member.
9 . The seal assembly of claim 1 wherein said first edge is further defined as having a first diameter and said second edge is further defined as having a second diameter greater than said first diameter.
10 . The seal assembly of claim 9 wherein said rougher second surface portion is spaced from said first edge.
11 . The seal assembly of claim 10 wherein said rougher second surface portion extends along said axis from said second edge.
12 . The seal assembly of claim 11 wherein said first surface portion and said second surface portion are continuous.
13 . The seal assembly of claim 12 wherein said first surface portion and said second surface portion extend directly to one another from said first edge and second edge, respectively.
14 . A seal assembly for a shaft comprising:
a seal member operable to encircle a rotatable shaft and having an outwardly facing annular sealing surface; and
a carrier having an aperture sealingly receiving said annular sealing surface and extending along an axis between a first edge to a second edge, wherein said aperture includes a first surface portion having a first surface finish and a second surface portion having a second surface finish rougher than said first surface finish to limit movement of said seal member along said axis and wherein said first edge is further defined as having a first diameter and said second edge is further defined as having a second diameter greater than said first diameter.
15 . The seal assembly of claim 14 wherein said rougher second surface portion is spaced from said first edge.
16 . The seal assembly of claim 15 wherein said rougher second surface portion extends along said axis from said second edge.
17 . The seal assembly of claim 14 wherein said first surface portion and said second surface portion are continuous.
18 . The seal assembly of claim 14 wherein said first surface portion and said second surface portion extend directly to one another from said first edge and second edge, respectively.