Fuel injection device for combustion engine has 2 valve elements that can be lift controlled by additional control surfaces acting in closing direction; spring devices, pressure surface design allows valve elements to be pressure controlled

摘要

The device (18) has at least two coaxial valve elements (32,34), each with at least one pressure surface acting in the opening direction bounding a pressure chamber and a closing spring device (58,84). Each valve element has at least one associated fuel outlet opening (36,38) and at least one has a control surface (86,88) acting in the closing direction and bounding a control chamber for lift control. Both valve elements can be lift controlled by additional control surfaces acting in the closing direction. The spring devices and the pressure surfaces are also formed to allow the valve elements to be pressure controlled. An independent claim is also included for the following: (a) a method of operating a fuel injection device.