US 7,320,310 B2 | ||
Fuel injector provided with provided with a pressure transmitter controlled by a servo valve | ||
Nadja Eisenmenger, Stuttgart (Germany); and Hans-Christoph Magel, Pfullingen (Germany) | ||
Assigned to Robert Bosch GmbH, Stuttgart (Germany) | ||
Appl. No. 10/551,461 PCT Filed Mar. 04, 2004, PCT No. PCT/DE2004/000413 § 371(c)(1), (2), (4) Date Sep. 30, 2005, PCT Pub. No. WO2004/088122, PCT Pub. Date Oct. 14, 2004. |
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Claims priority of application No. 103 15 014 (DE), filed on Apr. 02, 2003; and application No. 103 25 620 (DE), filed on Jun. 05, 2003. | ||
Prior Publication US 2006/0243252 A1, Nov. 02, 2006 | ||
This patent is subject to a terminal disclaimer. | ||
Int. Cl. F02M 37/04 (2006.01) |
U.S. Cl. 123—446 [123/467] | 18 Claims |
1. A fuel injector for injecting fuel into a combustion chamber (23) of an internal combustion engine the injector comprising
a pressure booster (3) having a booster piston (4) which separates a work chamber (5), permanently subjected to fuel via a pressure source (1, 2), from a pressure-relievable differential pressure chamber (6), and
a servo valve (24) actuatable to effect a change in pressure in the differential pressure chamber (6), the servo valve opening or closing a hydraulic connection (21, 39, 42) of the differential pressure chamber (6) to a low-pressure-side return (28),
the servo valve (24) having a servo valve piston (32, 65), which is guided between a control chamber (36) and a first hydraulic chamber (38) and on which an operative hydraulic face (44), constantly urged in the opening direction of the servo valve piston (32) by a system pressure, and a first sealing seat (40), which seals off the servo valve (24) from a low-pressure-side return (28) wherein the servo valve piston (32) comprises a first sealing seat (40), which opens or closes the low-pressure-side return (28), and a control edge (41), which separates the first hydraulic chamber (38) from a second hydraulic chamber (39).
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