| 摘要 |
On a radial shaft seal for sealing a closed internal space ( 20 ), filled with a fluid medium, on a rotating shaft ( 12 ) against the external atmosphere ( 30 ), comprising at least one membrane body ( 4 ) displaying a sealing membrane ( 8 ) with a sealing lip ( 9 ) that can be positioned in sealing fashion on the shaft ( 12 ) and is set obliquely to the internal space ( 20 ), where the side of the sealing membrane facing away from the internal space ( 20 ) is supported by a supporting element ( 3 ), the edge ( 3 r) of which facing the shaft forms an annular gap with the latter, it is envisaged that at least the edge area ( 3 r) of the supporting element ( 3 ) adjacent to the shaft ( 12 ) is made of a non-elastic plastic material, and that the width d of the annular gap ( 14 ) between the edge ( 3 r) of the supporting element ( 3 ) and the shaft ( 12 ) is dimensioned in such a way that a pressure of 20 hPa at most can be achieved in the internal space ( 20 ) when pumping out the air from the internal space ( 20 ) against the air flowing in through the annular gap ( 14 ).
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