| 摘要 |
An annular shaft seal and method for sealing the shaft of a water pump used with coolants containing anti-corrosion compounds that can precipitate out as particles that can cause wear of shaft and seal. The shaft seal of this invention has a primary sealing element and a unique auxiliary sealing element. The unique auxiliary sealing element has a large lip contact width and is located axially inwardly of the primary sealing element for causing the anti-corrosion compounds to precipitate out at a location axially inwardly from the primary sealing element and over a larger than normal area thus reducing shaft wear due to lower unit loading. The seal also includes means for preventing the precipitated-out particles from reaching the shaft-contacting lip of the primary sealing element.
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