| 摘要 |
To provide two pressure ranges for selective control of the stroke of a fuel injection valve, the valve element has a plate-like rocker coupled thereto, which is engaged at one side by the customary closing spring, for example via a spring disk having a central projection fitting into a matching depression of the rocker element. The rocker element is pivotable about a pivot bearing (22), for example in form of a knife edge, secured to the needle valve, the pivot bearing engaging the side of the rocker element remote from the spring and subdividing the rocker element into two unequal rocker arms (24, 26) which, respectively, bear against shoulders (25, 29a) of the housing. Upon application of fluid pressure in a first pressure level, the longer one of the rocker arms will be in engagement with a shoulder formed on the housing until sufficiently deflected to effect engagement of the shorter one of the rocker arms (26) with another shoulder (29a) of the housing to thereby change the leverage of force being transferred from the spring to the rocker arm and requiring substantially higher pressure of fluid in order to raise the needle valve beyond the engagement position of the shorter one (26) of the rocker arms with the second shoulder (29a) of the housing.
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