| 摘要 |
A hydraulically-actuated fuel injector (10) includes an injector body (11) that defines an actuation fluid inlet (15) that is open to a first actuation fluid cavity (27), and a second actuation fluid cavity (28) that is connected to the first actuation fluid cavity (27) via a connection passage (29). The injector body (11) also defines at least one actuation fluid drain (17, 18). A source of relatively high pressure actuation fluid (13) is connected to the actuation fluid inlet (15). A relatively low pressure reservoir (16) is connected to the at least one actuation fluid drain (17, 18). A control valve (12) is attached to the injector body (11) and is moveable between a first position in which the second actuation fluid cavity (28) is open to the first actuation fluid cavity (27), and a second position in which the second actuation fluid cavity (28) is open to the at least one actuation fluid drain (17, 18). An intensifier piston (40) is exposed to fluid pressure in the first actuation fluid cavity (27), and in the second actuation fluid cavity (28).
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