| 摘要 |
A module, direct fuel injector (10) includes a fuel side sub-assembly (78) having valve body structure (12, 14) defining a main flow passage (16) there-through, an outlet opening (26) and a seating surface (24). A needle (18) is in the main flow passage and has first and second ends. The second end (22) has a sealing surface (20). The needle is movable between a closed position with the sealing surface engaging the seating surface to prevent fuel from passing through the outlet opening, and an open position. A spring (30) biases the needle to the closed position. Manifold structure (36, 48) is coupled to the valve body structure. The injector also includes a dry side sub-assembly including a piezo stack (42) coupled to the manifold structure and changes length when voltage is applied thereto. The piezo stack is associated with the first end of the needle so that when the length of the piezo stack changes, the needle moves from the closed position to the open position thereof.
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