Reduced-leakage pressure supply for fuel injectors
AssigneeRobert Bosch GmbH
InventorPatrick Mattes
Life of this patent
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Abstract
The invention relates to a fuel injector which includes a hydraulic booster which can be made to communicate on the high-pressure side with an inlet from a high-pressure source. Between a high-pressure side and a system pressure side, there is a throttle restriction. A throttle element that can be acted upon by pressure from the high-pressure side and that is associated with an outflow opening is received movably in a hollow chamber of the injector body and closes a sealing gap that lengthens a sealing length.
Claims15
A fuel injector having an injector body (12) which includes a hydraulic booster (7) whose pressure chamber (9) is filled from a system pressure region, the injection comprising
- a throttle (2) that can be made to communicate with the high-pressure region,
- a system pressure valve (3) for maintaining the pressure in the system pressure region,
- a throttle element (38, 52, 60) associated with an outflow opening (37) and that can be acted upon by pressure from the high-pressure side (30),
- a spring element (63) acting on the throttle element (38, 52, 60), the throttle element being pistonlike and being guided movably in a longitudinal guide (61),
- an annular gap (64) formed between the longitudinal guide (51) and the pistonlike throttle element, the sealing length (65, 67) of the gap (64) between the longitudinal guide (61) and the pistonlike throttle element (60) being variable.
Dependencies are inferred from the claim text.