Fuel injector comprising booster for multiple injection
AssigneeRobert Bosch GmbH
InventorVolkmar Kern
Life of this patent
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Abstract
A device for injecting fuel into the combustion chamber of an internal combustion engine, a high-pressure accumulator, a pressure booster, and a metering valve. The pressure booster has a working chamber and a control chamber that are separated from each other by an axially moving piston. A pressure change in the control chamber of the pressure booster causes a pressure change in a compression chamber of the pressure booster. The compression chamber communicates with a hydraulic chamber that acts on an injection valve element. The piston that acts on the compression chamber of the pressure booster is provided with control sections that can be used to relieve the pressure in the hydraulic chamber of the injection valve element.
Claims16
A device for injecting fuel into a combustion chamber (7) of an internal combustion engine, comprising
- a high-pressure accumulator (2),
- a pressure booster (5),
- a metering valve (6),
- the pressure booster (5) having a working chamber (10) and a control chamber (11) separated from each other by an axially moving piston (12;
- 13, 14),
- a pressure change in the control chamber (11) of the pressure booster (5) causing a pressure change in a compression chamber (15) of the pressure booster (5),
- the compression chamber (15) communicating with a hydraulic chamber (31) associated with an injection valve element (34), and
- control sections (19, 21) provided on the piston (12;
- 13, 14) that acts on the compression chamber (15) of the pressure booster (5) for relieving the pressure in the hydraulic chamber (31) of the injection valve element (34).
Dependencies are inferred from the claim text.