| US 7,461,795 B2 | ||
| Fuel injection system for internal combustion engines | ||
| Hans-Christoph Magel, Pfullingen (Germany) | ||
| Assigned to Robert Bosch GmbH, Stuttgart (Germany) | ||
| Appl. No. 10/532,493 PCT Filed Jun. 30, 2003, PCT No. PCT/DE03/02174 § 371(c)(1), (2), (4) Date Apr. 25, 2005, PCT Pub. No. WO2004/040117, PCT Pub. Date May 13, 2004. |
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| Claims priority of application No. 102 49 840 (DE), filed on Oct. 25, 2002. | ||
| Prior Publication US 2006/0049284 A1, Mar. 09, 2006 | ||
| Int. Cl. F02M 47/02 (2006.01); B05B 1/30 (2006.01) | ||
| U.S. Cl. 239—88 [239/533.9; 239/584; 239/585.5] | 11 Claims |
| 1. A fuel injection system for internal combustion engines, comprising
a fuel injection nozzle (2), which can be supplied with fuel by a high-pressure fuel source (1), the fuel injection nozzle (2) having a movable nozzle piston (3) for opening and closing injection openings (6), an injection nozzle high-pressure chamber (21), an injection nozzle control chamber (20), and a closing spring located within the control chamber (20) for biasing the nozzle piston (3) in a direction to close the injection openings (6),
a pressure boosting device (7) is connected between the fuel injection nozzle (2) and the high-pressure fuel source (1), the pressure boosting device (7) having a movable pressure booster piston (8), a pressure booster work chamber (11), and a pressure booster high-pressure chamber (9), and
a filling connection (10) which is open for filling the pressure booster high-pressure chamber (9) when the fuel injection nozzle (2) is closed and is itself closed by the nozzle piston (3) when the fuel injection nozzle (2) is open, said filling connection (10) including a throttle (23),
wherein closure of the filling connection (10) is coupled with the motion of the nozzle piston (3) in the opening direction to uncover the injection openings, and
wherein the control chamber (20) is hydraulically connected to the pressure booster high-pressure chamber (9) by the filling connection (10).
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