Sealing member for ferrofluid seal and method of producing the same
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United States of America Patent
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-
Oct 1, 1991
Grant Date -
N/A
app pub date -
Nov 29, 1989
filing date -
Mar 31, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to an annular sealing member (7) arranged so as to surround the periphery of a working member such as a shaft (10). This sealing member (7) is produced by sticking a sheet (1) of elastic magnet to pole piece-constructing sheets (2,2), and punching the resulting assembly. The annular portion of said sheet (1) of elastic magnet is pressed to be contracted in the direction of thickness and stretched in the radial direction by said punching. As a result, the circumferential portion of the above described annular magnet (8) is dislocated so as to be sunk from the periphery of said annular pole pieces (9,9). Accordingly, the dimensional accuracy of inner and outer circumferences of the sealing member (7) is improved.
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