| 摘要 |
A fuel injector (<HIL><PDAT>1</BOLD><PDAT>), especially an injector for fuel injection systems of internal combustion engines (<HIL><PDAT>51</BOLD><PDAT>), has a piezoelectric or magnetostrictive actuator (<HIL><PDAT>14</BOLD><PDAT>), a valve-closure member (<HIL><PDAT>8</BOLD><PDAT>) that is actuated by an actuator (<HIL><PDAT>14</BOLD><PDAT>) using a valve needle (<HIL><PDAT>9</BOLD><PDAT>), the valve-closure member cooperating with a valve seat surface (<HIL><PDAT>7</BOLD><PDAT>) to form a sealing seat, and having at least one spray-discharge opening (<HIL><PDAT>10, 11</BOLD><PDAT>) that is sealed by the sealing seat. In this context, the valve seat surface (<HIL><PDAT>7</BOLD><PDAT>) and/or the valve-closure member (<HIL><PDAT>8</BOLD><PDAT>) has partial areas (<HIL><PDAT>30</BOLD><HIL><PDAT>a, </ITALIC><HIL><PDAT>30</BOLD><HIL><PDAT>b</ITALIC><PDAT>) that are arranged so as to be offset on the circumference, the partial areas throttling a fuel flow to differing extents as a function of a stroke of the valve needle (<HIL><PDAT>9</BOLD><PDAT>).</PTEXT>
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