Patent ID: 8210454

Claim:
A fuel injector for injecting fuel into a combustion chamber of an internal combustion engine, comprising: an injection valve element for opening and closing at least one injection opening; a pressure booster having a pressure booster piston with which fuel at system pressure is compressed to injection pressure; a first control valve which triggers the pressure booster; a second control valve which triggers the injection valve element; and a spring element, which is associated with the pressure booster piston, having one end supported on an injector housing and another end supported on the pressure booster piston, wherein the pressure booster piston delimits a compression chamber, a differential pressure chamber, and a control chamber, wherein the control chamber is situated at an end of the pressure booster piston and the compression chamber is situated at an end of the pressure booster opposite the control chamber, wherein the spring element is contained in the control chamber with one end of the spring element supported on the injector housing and the other end of the spring element supported on the pressure booster piston, wherein a spring plate against which the spring element rests is mounted on the pressure booster piston, and wherein the spring plate rests against a ring element that is accommodated in a groove in the pressure booster piston.