| 摘要 |
An electro-mechanical switch, which is part of an electrical current circuit, is disposed in a fuel injection nozzle for internal combustion engines. The first switch contact is secured via an insulating body of a pressure bolt of the nozzle needle; the second switch contact is held pressed against the first switch contact by a contact spring supported on the pressure bolt, so that the portion of the electrical current circuit comprising the nozzle is closed. At the beginning of the opening stroke of the nozzle needle, the second switch contact, because of its inertia of mass, briefly fails to follow the first contact so that the electrical current circuit is interrupted; it is closed by the followup of the first switch contact caused by the contact spring. The switch can be inserted inside a normal injection nozzle without great expense.
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