Patent ID: 8161947

Claim:
A pressure boosting system for at least one fuel injector of a high-pressure injection system of an internal combustion engine, having a hydraulic pressure booster that is actuated by an on-off valve and which is embodied with a pressure booster piston, the pressure booster piston having a first pressure booster piston part with a first diameter and a second pressure booster piston part with a second different diameter, the first diameter being larger than the second diameter, and a high-pressure chamber acted on by one pressure booster piston part and a control chamber acted on by the other pressure booster piston part, the pressure booster piston being disposed inside a hydraulic reservoir chamber, with the first pressure booster piston part having a larger diameter being subjected to pressure and embodied inside a base body, wherein the base body has a piston guide body for at least one of the first pressure booster piston part and the second pressure booster piston parts, and the piston guide body is at least partly surrounded by an annular chamber which is part of the hydraulic reservoir chamber.