| 摘要 |
A hydraulically actuated fuel injector includes an injector body that defines a high pressure passage, a low pressure passage, a control passage, a fuel inlet, and a nozzle outlet. The injector body includes upper surface and a lower surface that partially define an armature cavity. The injector body also defines a fluid displacement passage that is separated from the upper surface and the lower surface and extends between the armature cavity and a low pressure area. The fluid displacement passage is positioned and sized such that an amount of oil is always maintained in the armature cavity at least to a level below the fluid displacement passage but above the lower surface. In addition, the fluid displacement passage is sized and positioned to ensure adequate drainage for cold start, yet provide a flow restriction especially at idle conditions to produce sufficient valve damping that a substantial reduction in impact noise occurs.
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