| 摘要 |
In order to increase the lifetime for a piezoactuator of a fuel injector and to make possible a reliable seal of the piezoactor especially for comparatively thin head plates as well a gas exchange passage running through an actuator housing ( 52, 54 ) is provided, where a sealing unit ( 2 ) placed on the head arrangement ( 16, 18 ) is provided for sealing the piezoactor ( 12 ) which features a carrier ( 28 ) on which a sealing material ( 30 ) is arranged which forms a seal around the piezo contact pins ( 14 ) and the head arrangement ( 16, 18 ) and on which a microporous gas exchanger ( 26 ) to create gas permeability of the sealing unit ( 24 ) is integrated such that any fluid which has penetrated through to the gas exchanger ( 26 ) can flow out of the gas exchanger ( 26 ) under the force of gravity.
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