| 主权项 |
1. A double sealing device for a rotating shaft, notably for a rotating shaft or spindle of a fuel injection pump, the double sealing device comprising:
a first and a second seal of annular form, the first and second seal mounted side by side in a peripheral groove formed in a wall of a circular cylindrical housing through which the shaft to be sealed passes, wherein at least one of a discharge or vent channel opens into the peripheral groove between the two seals; wherein each of the first and second seals comprises:
a carrier ring of metal material with an outer axial flange and an inner radial flange, anda sealing washer applied to each corresponding carrier ring so as to cover at least a part of an outer face of the axial flange, thereby forming a seal between the axial flange and the wall of the housing as well as an adjacent face of the radial flange, and so as to extend beyond a free end of the radial flange to form a sealing lip bearing slidably on the shaft to be sealed, the first seal keeping a first fluid medium sealed off from the peripheral groove and the second seal keeping a second fluid medium sealed off from the peripheral groove; wherein the axial flange of at least one of the carrier rings of the first and second seals has an extension at its free end forming a pierced or cut-out ring structure, not covered by the sealing washer of the corresponding seal, and disposed substantially facing the peripheral groove and pointing towards the other of the first and second seals. |
