| 摘要 |
In a fuel injector (1), in particular a fuel injector for fuel-injection systems of internal combustion engines, a piezoelectric or magnetostrictive actuator (2) is surrounded by a compensation sleeve (6). The compensation sleeve (6) is made of a material exhibiting virtually no, or negative, thermal expansion, so that the thermal expansion of the compensation sleeve (6) and that of an upper valve-body section (3) and/or lower valve-body section (13) essentially corresponds to the thermal expansion of the actuator (2) and effective transmission elements (7, 9) to the valve-sealing seat. The compensation sleeve (6), radially on the outside, is enclosed by a spring sleeve (17), which connects the lower valve-body section (13) to the upper valve-body section (3) and prestresses the compensation sleeve (6) for pressure.
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